• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 //     * Redistributions of source code must retain the above copyright
7 //       notice, this list of conditions and the following disclaimer.
8 //     * Redistributions in binary form must reproduce the above
9 //       copyright notice, this list of conditions and the following
10 //       disclaimer in the documentation and/or other materials provided
11 //       with the distribution.
12 //     * Neither the name of Google Inc. nor the names of its
13 //       contributors may be used to endorse or promote products derived
14 //       from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
28 #include <limits.h>  // For LONG_MIN, LONG_MAX.
29 
30 #include "v8.h"
31 
32 #if defined(V8_TARGET_ARCH_ARM)
33 
34 #include "bootstrapper.h"
35 #include "codegen.h"
36 #include "debug.h"
37 #include "runtime.h"
38 
39 namespace v8 {
40 namespace internal {
41 
MacroAssembler(Isolate * arg_isolate,void * buffer,int size)42 MacroAssembler::MacroAssembler(Isolate* arg_isolate, void* buffer, int size)
43     : Assembler(arg_isolate, buffer, size),
44       generating_stub_(false),
45       allow_stub_calls_(true),
46       has_frame_(false) {
47   if (isolate() != NULL) {
48     code_object_ = Handle<Object>(isolate()->heap()->undefined_value(),
49                                   isolate());
50   }
51 }
52 
53 
54 // We always generate arm code, never thumb code, even if V8 is compiled to
55 // thumb, so we require inter-working support
56 #if defined(__thumb__) && !defined(USE_THUMB_INTERWORK)
57 #error "flag -mthumb-interwork missing"
58 #endif
59 
60 
61 // We do not support thumb inter-working with an arm architecture not supporting
62 // the blx instruction (below v5t).  If you know what CPU you are compiling for
63 // you can use -march=armv7 or similar.
64 #if defined(USE_THUMB_INTERWORK) && !defined(CAN_USE_THUMB_INSTRUCTIONS)
65 # error "For thumb inter-working we require an architecture which supports blx"
66 #endif
67 
68 
69 // Using bx does not yield better code, so use it only when required
70 #if defined(USE_THUMB_INTERWORK)
71 #define USE_BX 1
72 #endif
73 
74 
Jump(Register target,Condition cond)75 void MacroAssembler::Jump(Register target, Condition cond) {
76 #if USE_BX
77   bx(target, cond);
78 #else
79   mov(pc, Operand(target), LeaveCC, cond);
80 #endif
81 }
82 
83 
Jump(intptr_t target,RelocInfo::Mode rmode,Condition cond)84 void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
85                           Condition cond) {
86 #if USE_BX
87   mov(ip, Operand(target, rmode));
88   bx(ip, cond);
89 #else
90   mov(pc, Operand(target, rmode), LeaveCC, cond);
91 #endif
92 }
93 
94 
Jump(Address target,RelocInfo::Mode rmode,Condition cond)95 void MacroAssembler::Jump(Address target, RelocInfo::Mode rmode,
96                           Condition cond) {
97   ASSERT(!RelocInfo::IsCodeTarget(rmode));
98   Jump(reinterpret_cast<intptr_t>(target), rmode, cond);
99 }
100 
101 
Jump(Handle<Code> code,RelocInfo::Mode rmode,Condition cond)102 void MacroAssembler::Jump(Handle<Code> code, RelocInfo::Mode rmode,
103                           Condition cond) {
104   ASSERT(RelocInfo::IsCodeTarget(rmode));
105   // 'code' is always generated ARM code, never THUMB code
106   Jump(reinterpret_cast<intptr_t>(code.location()), rmode, cond);
107 }
108 
109 
CallSize(Register target,Condition cond)110 int MacroAssembler::CallSize(Register target, Condition cond) {
111 #if USE_BLX
112   return kInstrSize;
113 #else
114   return 2 * kInstrSize;
115 #endif
116 }
117 
118 
Call(Register target,Condition cond)119 void MacroAssembler::Call(Register target, Condition cond) {
120   // Block constant pool for the call instruction sequence.
121   BlockConstPoolScope block_const_pool(this);
122   Label start;
123   bind(&start);
124 #if USE_BLX
125   blx(target, cond);
126 #else
127   // set lr for return at current pc + 8
128   mov(lr, Operand(pc), LeaveCC, cond);
129   mov(pc, Operand(target), LeaveCC, cond);
130 #endif
131   ASSERT_EQ(CallSize(target, cond), SizeOfCodeGeneratedSince(&start));
132 }
133 
134 
CallSize(Address target,RelocInfo::Mode rmode,Condition cond)135 int MacroAssembler::CallSize(
136     Address target, RelocInfo::Mode rmode, Condition cond) {
137   int size = 2 * kInstrSize;
138   Instr mov_instr = cond | MOV | LeaveCC;
139   intptr_t immediate = reinterpret_cast<intptr_t>(target);
140   if (!Operand(immediate, rmode).is_single_instruction(mov_instr)) {
141     size += kInstrSize;
142   }
143   return size;
144 }
145 
146 
Call(Address target,RelocInfo::Mode rmode,Condition cond)147 void MacroAssembler::Call(Address target,
148                           RelocInfo::Mode rmode,
149                           Condition cond) {
150   // Block constant pool for the call instruction sequence.
151   BlockConstPoolScope block_const_pool(this);
152   Label start;
153   bind(&start);
154 #if USE_BLX
155   // On ARMv5 and after the recommended call sequence is:
156   //  ldr ip, [pc, #...]
157   //  blx ip
158 
159   // Statement positions are expected to be recorded when the target
160   // address is loaded. The mov method will automatically record
161   // positions when pc is the target, since this is not the case here
162   // we have to do it explicitly.
163   positions_recorder()->WriteRecordedPositions();
164 
165   mov(ip, Operand(reinterpret_cast<int32_t>(target), rmode));
166   blx(ip, cond);
167 
168   ASSERT(kCallTargetAddressOffset == 2 * kInstrSize);
169 #else
170   // Set lr for return at current pc + 8.
171   mov(lr, Operand(pc), LeaveCC, cond);
172   // Emit a ldr<cond> pc, [pc + offset of target in constant pool].
173   mov(pc, Operand(reinterpret_cast<int32_t>(target), rmode), LeaveCC, cond);
174   ASSERT(kCallTargetAddressOffset == kInstrSize);
175 #endif
176   ASSERT_EQ(CallSize(target, rmode, cond), SizeOfCodeGeneratedSince(&start));
177 }
178 
179 
CallSize(Handle<Code> code,RelocInfo::Mode rmode,unsigned ast_id,Condition cond)180 int MacroAssembler::CallSize(Handle<Code> code,
181                              RelocInfo::Mode rmode,
182                              unsigned ast_id,
183                              Condition cond) {
184   return CallSize(reinterpret_cast<Address>(code.location()), rmode, cond);
185 }
186 
187 
Call(Handle<Code> code,RelocInfo::Mode rmode,unsigned ast_id,Condition cond)188 void MacroAssembler::Call(Handle<Code> code,
189                           RelocInfo::Mode rmode,
190                           unsigned ast_id,
191                           Condition cond) {
192   Label start;
193   bind(&start);
194   ASSERT(RelocInfo::IsCodeTarget(rmode));
195   if (rmode == RelocInfo::CODE_TARGET && ast_id != kNoASTId) {
196     SetRecordedAstId(ast_id);
197     rmode = RelocInfo::CODE_TARGET_WITH_ID;
198   }
199   // 'code' is always generated ARM code, never THUMB code
200   Call(reinterpret_cast<Address>(code.location()), rmode, cond);
201   ASSERT_EQ(CallSize(code, rmode, ast_id, cond),
202             SizeOfCodeGeneratedSince(&start));
203 }
204 
205 
Ret(Condition cond)206 void MacroAssembler::Ret(Condition cond) {
207 #if USE_BX
208   bx(lr, cond);
209 #else
210   mov(pc, Operand(lr), LeaveCC, cond);
211 #endif
212 }
213 
214 
Drop(int count,Condition cond)215 void MacroAssembler::Drop(int count, Condition cond) {
216   if (count > 0) {
217     add(sp, sp, Operand(count * kPointerSize), LeaveCC, cond);
218   }
219 }
220 
221 
Ret(int drop,Condition cond)222 void MacroAssembler::Ret(int drop, Condition cond) {
223   Drop(drop, cond);
224   Ret(cond);
225 }
226 
227 
Swap(Register reg1,Register reg2,Register scratch,Condition cond)228 void MacroAssembler::Swap(Register reg1,
229                           Register reg2,
230                           Register scratch,
231                           Condition cond) {
232   if (scratch.is(no_reg)) {
233     eor(reg1, reg1, Operand(reg2), LeaveCC, cond);
234     eor(reg2, reg2, Operand(reg1), LeaveCC, cond);
235     eor(reg1, reg1, Operand(reg2), LeaveCC, cond);
236   } else {
237     mov(scratch, reg1, LeaveCC, cond);
238     mov(reg1, reg2, LeaveCC, cond);
239     mov(reg2, scratch, LeaveCC, cond);
240   }
241 }
242 
243 
Call(Label * target)244 void MacroAssembler::Call(Label* target) {
245   bl(target);
246 }
247 
248 
Push(Handle<Object> handle)249 void MacroAssembler::Push(Handle<Object> handle) {
250   mov(ip, Operand(handle));
251   push(ip);
252 }
253 
254 
Move(Register dst,Handle<Object> value)255 void MacroAssembler::Move(Register dst, Handle<Object> value) {
256   mov(dst, Operand(value));
257 }
258 
259 
Move(Register dst,Register src,Condition cond)260 void MacroAssembler::Move(Register dst, Register src, Condition cond) {
261   if (!dst.is(src)) {
262     mov(dst, src, LeaveCC, cond);
263   }
264 }
265 
266 
Move(DoubleRegister dst,DoubleRegister src)267 void MacroAssembler::Move(DoubleRegister dst, DoubleRegister src) {
268   ASSERT(CpuFeatures::IsSupported(VFP3));
269   CpuFeatures::Scope scope(VFP3);
270   if (!dst.is(src)) {
271     vmov(dst, src);
272   }
273 }
274 
275 
And(Register dst,Register src1,const Operand & src2,Condition cond)276 void MacroAssembler::And(Register dst, Register src1, const Operand& src2,
277                          Condition cond) {
278   if (!src2.is_reg() &&
279       !src2.must_use_constant_pool() &&
280       src2.immediate() == 0) {
281     mov(dst, Operand(0, RelocInfo::NONE), LeaveCC, cond);
282 
283   } else if (!src2.is_single_instruction() &&
284              !src2.must_use_constant_pool() &&
285              CpuFeatures::IsSupported(ARMv7) &&
286              IsPowerOf2(src2.immediate() + 1)) {
287     ubfx(dst, src1, 0,
288         WhichPowerOf2(static_cast<uint32_t>(src2.immediate()) + 1), cond);
289 
290   } else {
291     and_(dst, src1, src2, LeaveCC, cond);
292   }
293 }
294 
295 
Ubfx(Register dst,Register src1,int lsb,int width,Condition cond)296 void MacroAssembler::Ubfx(Register dst, Register src1, int lsb, int width,
297                           Condition cond) {
298   ASSERT(lsb < 32);
299   if (!CpuFeatures::IsSupported(ARMv7)) {
300     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
301     and_(dst, src1, Operand(mask), LeaveCC, cond);
302     if (lsb != 0) {
303       mov(dst, Operand(dst, LSR, lsb), LeaveCC, cond);
304     }
305   } else {
306     ubfx(dst, src1, lsb, width, cond);
307   }
308 }
309 
310 
Sbfx(Register dst,Register src1,int lsb,int width,Condition cond)311 void MacroAssembler::Sbfx(Register dst, Register src1, int lsb, int width,
312                           Condition cond) {
313   ASSERT(lsb < 32);
314   if (!CpuFeatures::IsSupported(ARMv7)) {
315     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
316     and_(dst, src1, Operand(mask), LeaveCC, cond);
317     int shift_up = 32 - lsb - width;
318     int shift_down = lsb + shift_up;
319     if (shift_up != 0) {
320       mov(dst, Operand(dst, LSL, shift_up), LeaveCC, cond);
321     }
322     if (shift_down != 0) {
323       mov(dst, Operand(dst, ASR, shift_down), LeaveCC, cond);
324     }
325   } else {
326     sbfx(dst, src1, lsb, width, cond);
327   }
328 }
329 
330 
Bfi(Register dst,Register src,Register scratch,int lsb,int width,Condition cond)331 void MacroAssembler::Bfi(Register dst,
332                          Register src,
333                          Register scratch,
334                          int lsb,
335                          int width,
336                          Condition cond) {
337   ASSERT(0 <= lsb && lsb < 32);
338   ASSERT(0 <= width && width < 32);
339   ASSERT(lsb + width < 32);
340   ASSERT(!scratch.is(dst));
341   if (width == 0) return;
342   if (!CpuFeatures::IsSupported(ARMv7)) {
343     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
344     bic(dst, dst, Operand(mask));
345     and_(scratch, src, Operand((1 << width) - 1));
346     mov(scratch, Operand(scratch, LSL, lsb));
347     orr(dst, dst, scratch);
348   } else {
349     bfi(dst, src, lsb, width, cond);
350   }
351 }
352 
353 
Bfc(Register dst,int lsb,int width,Condition cond)354 void MacroAssembler::Bfc(Register dst, int lsb, int width, Condition cond) {
355   ASSERT(lsb < 32);
356   if (!CpuFeatures::IsSupported(ARMv7)) {
357     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
358     bic(dst, dst, Operand(mask));
359   } else {
360     bfc(dst, lsb, width, cond);
361   }
362 }
363 
364 
Usat(Register dst,int satpos,const Operand & src,Condition cond)365 void MacroAssembler::Usat(Register dst, int satpos, const Operand& src,
366                           Condition cond) {
367   if (!CpuFeatures::IsSupported(ARMv7)) {
368     ASSERT(!dst.is(pc) && !src.rm().is(pc));
369     ASSERT((satpos >= 0) && (satpos <= 31));
370 
371     // These asserts are required to ensure compatibility with the ARMv7
372     // implementation.
373     ASSERT((src.shift_op() == ASR) || (src.shift_op() == LSL));
374     ASSERT(src.rs().is(no_reg));
375 
376     Label done;
377     int satval = (1 << satpos) - 1;
378 
379     if (cond != al) {
380       b(NegateCondition(cond), &done);  // Skip saturate if !condition.
381     }
382     if (!(src.is_reg() && dst.is(src.rm()))) {
383       mov(dst, src);
384     }
385     tst(dst, Operand(~satval));
386     b(eq, &done);
387     mov(dst, Operand(0, RelocInfo::NONE), LeaveCC, mi);  // 0 if negative.
388     mov(dst, Operand(satval), LeaveCC, pl);  // satval if positive.
389     bind(&done);
390   } else {
391     usat(dst, satpos, src, cond);
392   }
393 }
394 
395 
LoadRoot(Register destination,Heap::RootListIndex index,Condition cond)396 void MacroAssembler::LoadRoot(Register destination,
397                               Heap::RootListIndex index,
398                               Condition cond) {
399   ldr(destination, MemOperand(kRootRegister, index << kPointerSizeLog2), cond);
400 }
401 
402 
StoreRoot(Register source,Heap::RootListIndex index,Condition cond)403 void MacroAssembler::StoreRoot(Register source,
404                                Heap::RootListIndex index,
405                                Condition cond) {
406   str(source, MemOperand(kRootRegister, index << kPointerSizeLog2), cond);
407 }
408 
409 
LoadHeapObject(Register result,Handle<HeapObject> object)410 void MacroAssembler::LoadHeapObject(Register result,
411                                     Handle<HeapObject> object) {
412   if (isolate()->heap()->InNewSpace(*object)) {
413     Handle<JSGlobalPropertyCell> cell =
414         isolate()->factory()->NewJSGlobalPropertyCell(object);
415     mov(result, Operand(cell));
416     ldr(result, FieldMemOperand(result, JSGlobalPropertyCell::kValueOffset));
417   } else {
418     mov(result, Operand(object));
419   }
420 }
421 
422 
InNewSpace(Register object,Register scratch,Condition cond,Label * branch)423 void MacroAssembler::InNewSpace(Register object,
424                                 Register scratch,
425                                 Condition cond,
426                                 Label* branch) {
427   ASSERT(cond == eq || cond == ne);
428   and_(scratch, object, Operand(ExternalReference::new_space_mask(isolate())));
429   cmp(scratch, Operand(ExternalReference::new_space_start(isolate())));
430   b(cond, branch);
431 }
432 
433 
RecordWriteField(Register object,int offset,Register value,Register dst,LinkRegisterStatus lr_status,SaveFPRegsMode save_fp,RememberedSetAction remembered_set_action,SmiCheck smi_check)434 void MacroAssembler::RecordWriteField(
435     Register object,
436     int offset,
437     Register value,
438     Register dst,
439     LinkRegisterStatus lr_status,
440     SaveFPRegsMode save_fp,
441     RememberedSetAction remembered_set_action,
442     SmiCheck smi_check) {
443   // First, check if a write barrier is even needed. The tests below
444   // catch stores of Smis.
445   Label done;
446 
447   // Skip barrier if writing a smi.
448   if (smi_check == INLINE_SMI_CHECK) {
449     JumpIfSmi(value, &done);
450   }
451 
452   // Although the object register is tagged, the offset is relative to the start
453   // of the object, so so offset must be a multiple of kPointerSize.
454   ASSERT(IsAligned(offset, kPointerSize));
455 
456   add(dst, object, Operand(offset - kHeapObjectTag));
457   if (emit_debug_code()) {
458     Label ok;
459     tst(dst, Operand((1 << kPointerSizeLog2) - 1));
460     b(eq, &ok);
461     stop("Unaligned cell in write barrier");
462     bind(&ok);
463   }
464 
465   RecordWrite(object,
466               dst,
467               value,
468               lr_status,
469               save_fp,
470               remembered_set_action,
471               OMIT_SMI_CHECK);
472 
473   bind(&done);
474 
475   // Clobber clobbered input registers when running with the debug-code flag
476   // turned on to provoke errors.
477   if (emit_debug_code()) {
478     mov(value, Operand(BitCast<int32_t>(kZapValue + 4)));
479     mov(dst, Operand(BitCast<int32_t>(kZapValue + 8)));
480   }
481 }
482 
483 
484 // Will clobber 4 registers: object, address, scratch, ip.  The
485 // register 'object' contains a heap object pointer.  The heap object
486 // tag is shifted away.
RecordWrite(Register object,Register address,Register value,LinkRegisterStatus lr_status,SaveFPRegsMode fp_mode,RememberedSetAction remembered_set_action,SmiCheck smi_check)487 void MacroAssembler::RecordWrite(Register object,
488                                  Register address,
489                                  Register value,
490                                  LinkRegisterStatus lr_status,
491                                  SaveFPRegsMode fp_mode,
492                                  RememberedSetAction remembered_set_action,
493                                  SmiCheck smi_check) {
494   // The compiled code assumes that record write doesn't change the
495   // context register, so we check that none of the clobbered
496   // registers are cp.
497   ASSERT(!address.is(cp) && !value.is(cp));
498 
499   if (emit_debug_code()) {
500     ldr(ip, MemOperand(address));
501     cmp(ip, value);
502     Check(eq, "Wrong address or value passed to RecordWrite");
503   }
504 
505   Label done;
506 
507   if (smi_check == INLINE_SMI_CHECK) {
508     ASSERT_EQ(0, kSmiTag);
509     tst(value, Operand(kSmiTagMask));
510     b(eq, &done);
511   }
512 
513   CheckPageFlag(value,
514                 value,  // Used as scratch.
515                 MemoryChunk::kPointersToHereAreInterestingMask,
516                 eq,
517                 &done);
518   CheckPageFlag(object,
519                 value,  // Used as scratch.
520                 MemoryChunk::kPointersFromHereAreInterestingMask,
521                 eq,
522                 &done);
523 
524   // Record the actual write.
525   if (lr_status == kLRHasNotBeenSaved) {
526     push(lr);
527   }
528   RecordWriteStub stub(object, value, address, remembered_set_action, fp_mode);
529   CallStub(&stub);
530   if (lr_status == kLRHasNotBeenSaved) {
531     pop(lr);
532   }
533 
534   bind(&done);
535 
536   // Clobber clobbered registers when running with the debug-code flag
537   // turned on to provoke errors.
538   if (emit_debug_code()) {
539     mov(address, Operand(BitCast<int32_t>(kZapValue + 12)));
540     mov(value, Operand(BitCast<int32_t>(kZapValue + 16)));
541   }
542 }
543 
544 
RememberedSetHelper(Register object,Register address,Register scratch,SaveFPRegsMode fp_mode,RememberedSetFinalAction and_then)545 void MacroAssembler::RememberedSetHelper(Register object,  // For debug tests.
546                                          Register address,
547                                          Register scratch,
548                                          SaveFPRegsMode fp_mode,
549                                          RememberedSetFinalAction and_then) {
550   Label done;
551   if (emit_debug_code()) {
552     Label ok;
553     JumpIfNotInNewSpace(object, scratch, &ok);
554     stop("Remembered set pointer is in new space");
555     bind(&ok);
556   }
557   // Load store buffer top.
558   ExternalReference store_buffer =
559       ExternalReference::store_buffer_top(isolate());
560   mov(ip, Operand(store_buffer));
561   ldr(scratch, MemOperand(ip));
562   // Store pointer to buffer and increment buffer top.
563   str(address, MemOperand(scratch, kPointerSize, PostIndex));
564   // Write back new top of buffer.
565   str(scratch, MemOperand(ip));
566   // Call stub on end of buffer.
567   // Check for end of buffer.
568   tst(scratch, Operand(StoreBuffer::kStoreBufferOverflowBit));
569   if (and_then == kFallThroughAtEnd) {
570     b(eq, &done);
571   } else {
572     ASSERT(and_then == kReturnAtEnd);
573     Ret(eq);
574   }
575   push(lr);
576   StoreBufferOverflowStub store_buffer_overflow =
577       StoreBufferOverflowStub(fp_mode);
578   CallStub(&store_buffer_overflow);
579   pop(lr);
580   bind(&done);
581   if (and_then == kReturnAtEnd) {
582     Ret();
583   }
584 }
585 
586 
587 // Push and pop all registers that can hold pointers.
PushSafepointRegisters()588 void MacroAssembler::PushSafepointRegisters() {
589   // Safepoints expect a block of contiguous register values starting with r0:
590   ASSERT(((1 << kNumSafepointSavedRegisters) - 1) == kSafepointSavedRegisters);
591   // Safepoints expect a block of kNumSafepointRegisters values on the
592   // stack, so adjust the stack for unsaved registers.
593   const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters;
594   ASSERT(num_unsaved >= 0);
595   sub(sp, sp, Operand(num_unsaved * kPointerSize));
596   stm(db_w, sp, kSafepointSavedRegisters);
597 }
598 
599 
PopSafepointRegisters()600 void MacroAssembler::PopSafepointRegisters() {
601   const int num_unsaved = kNumSafepointRegisters - kNumSafepointSavedRegisters;
602   ldm(ia_w, sp, kSafepointSavedRegisters);
603   add(sp, sp, Operand(num_unsaved * kPointerSize));
604 }
605 
606 
PushSafepointRegistersAndDoubles()607 void MacroAssembler::PushSafepointRegistersAndDoubles() {
608   PushSafepointRegisters();
609   sub(sp, sp, Operand(DwVfpRegister::kNumAllocatableRegisters *
610                       kDoubleSize));
611   for (int i = 0; i < DwVfpRegister::kNumAllocatableRegisters; i++) {
612     vstr(DwVfpRegister::FromAllocationIndex(i), sp, i * kDoubleSize);
613   }
614 }
615 
616 
PopSafepointRegistersAndDoubles()617 void MacroAssembler::PopSafepointRegistersAndDoubles() {
618   for (int i = 0; i < DwVfpRegister::kNumAllocatableRegisters; i++) {
619     vldr(DwVfpRegister::FromAllocationIndex(i), sp, i * kDoubleSize);
620   }
621   add(sp, sp, Operand(DwVfpRegister::kNumAllocatableRegisters *
622                       kDoubleSize));
623   PopSafepointRegisters();
624 }
625 
StoreToSafepointRegistersAndDoublesSlot(Register src,Register dst)626 void MacroAssembler::StoreToSafepointRegistersAndDoublesSlot(Register src,
627                                                              Register dst) {
628   str(src, SafepointRegistersAndDoublesSlot(dst));
629 }
630 
631 
StoreToSafepointRegisterSlot(Register src,Register dst)632 void MacroAssembler::StoreToSafepointRegisterSlot(Register src, Register dst) {
633   str(src, SafepointRegisterSlot(dst));
634 }
635 
636 
LoadFromSafepointRegisterSlot(Register dst,Register src)637 void MacroAssembler::LoadFromSafepointRegisterSlot(Register dst, Register src) {
638   ldr(dst, SafepointRegisterSlot(src));
639 }
640 
641 
SafepointRegisterStackIndex(int reg_code)642 int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
643   // The registers are pushed starting with the highest encoding,
644   // which means that lowest encodings are closest to the stack pointer.
645   ASSERT(reg_code >= 0 && reg_code < kNumSafepointRegisters);
646   return reg_code;
647 }
648 
649 
SafepointRegisterSlot(Register reg)650 MemOperand MacroAssembler::SafepointRegisterSlot(Register reg) {
651   return MemOperand(sp, SafepointRegisterStackIndex(reg.code()) * kPointerSize);
652 }
653 
654 
SafepointRegistersAndDoublesSlot(Register reg)655 MemOperand MacroAssembler::SafepointRegistersAndDoublesSlot(Register reg) {
656   // General purpose registers are pushed last on the stack.
657   int doubles_size = DwVfpRegister::kNumAllocatableRegisters * kDoubleSize;
658   int register_offset = SafepointRegisterStackIndex(reg.code()) * kPointerSize;
659   return MemOperand(sp, doubles_size + register_offset);
660 }
661 
662 
Ldrd(Register dst1,Register dst2,const MemOperand & src,Condition cond)663 void MacroAssembler::Ldrd(Register dst1, Register dst2,
664                           const MemOperand& src, Condition cond) {
665   ASSERT(src.rm().is(no_reg));
666   ASSERT(!dst1.is(lr));  // r14.
667   ASSERT_EQ(0, dst1.code() % 2);
668   ASSERT_EQ(dst1.code() + 1, dst2.code());
669 
670   // V8 does not use this addressing mode, so the fallback code
671   // below doesn't support it yet.
672   ASSERT((src.am() != PreIndex) && (src.am() != NegPreIndex));
673 
674   // Generate two ldr instructions if ldrd is not available.
675   if (CpuFeatures::IsSupported(ARMv7)) {
676     CpuFeatures::Scope scope(ARMv7);
677     ldrd(dst1, dst2, src, cond);
678   } else {
679     if ((src.am() == Offset) || (src.am() == NegOffset)) {
680       MemOperand src2(src);
681       src2.set_offset(src2.offset() + 4);
682       if (dst1.is(src.rn())) {
683         ldr(dst2, src2, cond);
684         ldr(dst1, src, cond);
685       } else {
686         ldr(dst1, src, cond);
687         ldr(dst2, src2, cond);
688       }
689     } else {  // PostIndex or NegPostIndex.
690       ASSERT((src.am() == PostIndex) || (src.am() == NegPostIndex));
691       if (dst1.is(src.rn())) {
692         ldr(dst2, MemOperand(src.rn(), 4, Offset), cond);
693         ldr(dst1, src, cond);
694       } else {
695         MemOperand src2(src);
696         src2.set_offset(src2.offset() - 4);
697         ldr(dst1, MemOperand(src.rn(), 4, PostIndex), cond);
698         ldr(dst2, src2, cond);
699       }
700     }
701   }
702 }
703 
704 
Strd(Register src1,Register src2,const MemOperand & dst,Condition cond)705 void MacroAssembler::Strd(Register src1, Register src2,
706                           const MemOperand& dst, Condition cond) {
707   ASSERT(dst.rm().is(no_reg));
708   ASSERT(!src1.is(lr));  // r14.
709   ASSERT_EQ(0, src1.code() % 2);
710   ASSERT_EQ(src1.code() + 1, src2.code());
711 
712   // V8 does not use this addressing mode, so the fallback code
713   // below doesn't support it yet.
714   ASSERT((dst.am() != PreIndex) && (dst.am() != NegPreIndex));
715 
716   // Generate two str instructions if strd is not available.
717   if (CpuFeatures::IsSupported(ARMv7)) {
718     CpuFeatures::Scope scope(ARMv7);
719     strd(src1, src2, dst, cond);
720   } else {
721     MemOperand dst2(dst);
722     if ((dst.am() == Offset) || (dst.am() == NegOffset)) {
723       dst2.set_offset(dst2.offset() + 4);
724       str(src1, dst, cond);
725       str(src2, dst2, cond);
726     } else {  // PostIndex or NegPostIndex.
727       ASSERT((dst.am() == PostIndex) || (dst.am() == NegPostIndex));
728       dst2.set_offset(dst2.offset() - 4);
729       str(src1, MemOperand(dst.rn(), 4, PostIndex), cond);
730       str(src2, dst2, cond);
731     }
732   }
733 }
734 
735 
ClearFPSCRBits(const uint32_t bits_to_clear,const Register scratch,const Condition cond)736 void MacroAssembler::ClearFPSCRBits(const uint32_t bits_to_clear,
737                                     const Register scratch,
738                                     const Condition cond) {
739   vmrs(scratch, cond);
740   bic(scratch, scratch, Operand(bits_to_clear), LeaveCC, cond);
741   vmsr(scratch, cond);
742 }
743 
744 
VFPCompareAndSetFlags(const DwVfpRegister src1,const DwVfpRegister src2,const Condition cond)745 void MacroAssembler::VFPCompareAndSetFlags(const DwVfpRegister src1,
746                                            const DwVfpRegister src2,
747                                            const Condition cond) {
748   // Compare and move FPSCR flags to the normal condition flags.
749   VFPCompareAndLoadFlags(src1, src2, pc, cond);
750 }
751 
VFPCompareAndSetFlags(const DwVfpRegister src1,const double src2,const Condition cond)752 void MacroAssembler::VFPCompareAndSetFlags(const DwVfpRegister src1,
753                                            const double src2,
754                                            const Condition cond) {
755   // Compare and move FPSCR flags to the normal condition flags.
756   VFPCompareAndLoadFlags(src1, src2, pc, cond);
757 }
758 
759 
VFPCompareAndLoadFlags(const DwVfpRegister src1,const DwVfpRegister src2,const Register fpscr_flags,const Condition cond)760 void MacroAssembler::VFPCompareAndLoadFlags(const DwVfpRegister src1,
761                                             const DwVfpRegister src2,
762                                             const Register fpscr_flags,
763                                             const Condition cond) {
764   // Compare and load FPSCR.
765   vcmp(src1, src2, cond);
766   vmrs(fpscr_flags, cond);
767 }
768 
VFPCompareAndLoadFlags(const DwVfpRegister src1,const double src2,const Register fpscr_flags,const Condition cond)769 void MacroAssembler::VFPCompareAndLoadFlags(const DwVfpRegister src1,
770                                             const double src2,
771                                             const Register fpscr_flags,
772                                             const Condition cond) {
773   // Compare and load FPSCR.
774   vcmp(src1, src2, cond);
775   vmrs(fpscr_flags, cond);
776 }
777 
Vmov(const DwVfpRegister dst,const double imm,const Condition cond)778 void MacroAssembler::Vmov(const DwVfpRegister dst,
779                           const double imm,
780                           const Condition cond) {
781   ASSERT(CpuFeatures::IsEnabled(VFP3));
782   static const DoubleRepresentation minus_zero(-0.0);
783   static const DoubleRepresentation zero(0.0);
784   DoubleRepresentation value(imm);
785   // Handle special values first.
786   if (value.bits == zero.bits) {
787     vmov(dst, kDoubleRegZero, cond);
788   } else if (value.bits == minus_zero.bits) {
789     vneg(dst, kDoubleRegZero, cond);
790   } else {
791     vmov(dst, imm, cond);
792   }
793 }
794 
795 
EnterFrame(StackFrame::Type type)796 void MacroAssembler::EnterFrame(StackFrame::Type type) {
797   // r0-r3: preserved
798   stm(db_w, sp, cp.bit() | fp.bit() | lr.bit());
799   mov(ip, Operand(Smi::FromInt(type)));
800   push(ip);
801   mov(ip, Operand(CodeObject()));
802   push(ip);
803   add(fp, sp, Operand(3 * kPointerSize));  // Adjust FP to point to saved FP.
804 }
805 
806 
LeaveFrame(StackFrame::Type type)807 void MacroAssembler::LeaveFrame(StackFrame::Type type) {
808   // r0: preserved
809   // r1: preserved
810   // r2: preserved
811 
812   // Drop the execution stack down to the frame pointer and restore
813   // the caller frame pointer and return address.
814   mov(sp, fp);
815   ldm(ia_w, sp, fp.bit() | lr.bit());
816 }
817 
818 
EnterExitFrame(bool save_doubles,int stack_space)819 void MacroAssembler::EnterExitFrame(bool save_doubles, int stack_space) {
820   // Set up the frame structure on the stack.
821   ASSERT_EQ(2 * kPointerSize, ExitFrameConstants::kCallerSPDisplacement);
822   ASSERT_EQ(1 * kPointerSize, ExitFrameConstants::kCallerPCOffset);
823   ASSERT_EQ(0 * kPointerSize, ExitFrameConstants::kCallerFPOffset);
824   Push(lr, fp);
825   mov(fp, Operand(sp));  // Set up new frame pointer.
826   // Reserve room for saved entry sp and code object.
827   sub(sp, sp, Operand(2 * kPointerSize));
828   if (emit_debug_code()) {
829     mov(ip, Operand(0));
830     str(ip, MemOperand(fp, ExitFrameConstants::kSPOffset));
831   }
832   mov(ip, Operand(CodeObject()));
833   str(ip, MemOperand(fp, ExitFrameConstants::kCodeOffset));
834 
835   // Save the frame pointer and the context in top.
836   mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
837   str(fp, MemOperand(ip));
838   mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
839   str(cp, MemOperand(ip));
840 
841   // Optionally save all double registers.
842   if (save_doubles) {
843     DwVfpRegister first = d0;
844     DwVfpRegister last =
845         DwVfpRegister::from_code(DwVfpRegister::kNumRegisters - 1);
846     vstm(db_w, sp, first, last);
847     // Note that d0 will be accessible at
848     //   fp - 2 * kPointerSize - DwVfpRegister::kNumRegisters * kDoubleSize,
849     // since the sp slot and code slot were pushed after the fp.
850   }
851 
852   // Reserve place for the return address and stack space and align the frame
853   // preparing for calling the runtime function.
854   const int frame_alignment = MacroAssembler::ActivationFrameAlignment();
855   sub(sp, sp, Operand((stack_space + 1) * kPointerSize));
856   if (frame_alignment > 0) {
857     ASSERT(IsPowerOf2(frame_alignment));
858     and_(sp, sp, Operand(-frame_alignment));
859   }
860 
861   // Set the exit frame sp value to point just before the return address
862   // location.
863   add(ip, sp, Operand(kPointerSize));
864   str(ip, MemOperand(fp, ExitFrameConstants::kSPOffset));
865 }
866 
867 
InitializeNewString(Register string,Register length,Heap::RootListIndex map_index,Register scratch1,Register scratch2)868 void MacroAssembler::InitializeNewString(Register string,
869                                          Register length,
870                                          Heap::RootListIndex map_index,
871                                          Register scratch1,
872                                          Register scratch2) {
873   mov(scratch1, Operand(length, LSL, kSmiTagSize));
874   LoadRoot(scratch2, map_index);
875   str(scratch1, FieldMemOperand(string, String::kLengthOffset));
876   mov(scratch1, Operand(String::kEmptyHashField));
877   str(scratch2, FieldMemOperand(string, HeapObject::kMapOffset));
878   str(scratch1, FieldMemOperand(string, String::kHashFieldOffset));
879 }
880 
881 
ActivationFrameAlignment()882 int MacroAssembler::ActivationFrameAlignment() {
883 #if defined(V8_HOST_ARCH_ARM)
884   // Running on the real platform. Use the alignment as mandated by the local
885   // environment.
886   // Note: This will break if we ever start generating snapshots on one ARM
887   // platform for another ARM platform with a different alignment.
888   return OS::ActivationFrameAlignment();
889 #else  // defined(V8_HOST_ARCH_ARM)
890   // If we are using the simulator then we should always align to the expected
891   // alignment. As the simulator is used to generate snapshots we do not know
892   // if the target platform will need alignment, so this is controlled from a
893   // flag.
894   return FLAG_sim_stack_alignment;
895 #endif  // defined(V8_HOST_ARCH_ARM)
896 }
897 
898 
LeaveExitFrame(bool save_doubles,Register argument_count)899 void MacroAssembler::LeaveExitFrame(bool save_doubles,
900                                     Register argument_count) {
901   // Optionally restore all double registers.
902   if (save_doubles) {
903     // Calculate the stack location of the saved doubles and restore them.
904     const int offset = 2 * kPointerSize;
905     sub(r3, fp, Operand(offset + DwVfpRegister::kNumRegisters * kDoubleSize));
906     DwVfpRegister first = d0;
907     DwVfpRegister last =
908         DwVfpRegister::from_code(DwVfpRegister::kNumRegisters - 1);
909     vldm(ia, r3, first, last);
910   }
911 
912   // Clear top frame.
913   mov(r3, Operand(0, RelocInfo::NONE));
914   mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
915   str(r3, MemOperand(ip));
916 
917   // Restore current context from top and clear it in debug mode.
918   mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
919   ldr(cp, MemOperand(ip));
920 #ifdef DEBUG
921   str(r3, MemOperand(ip));
922 #endif
923 
924   // Tear down the exit frame, pop the arguments, and return.
925   mov(sp, Operand(fp));
926   ldm(ia_w, sp, fp.bit() | lr.bit());
927   if (argument_count.is_valid()) {
928     add(sp, sp, Operand(argument_count, LSL, kPointerSizeLog2));
929   }
930 }
931 
GetCFunctionDoubleResult(const DoubleRegister dst)932 void MacroAssembler::GetCFunctionDoubleResult(const DoubleRegister dst) {
933   if (use_eabi_hardfloat()) {
934     Move(dst, d0);
935   } else {
936     vmov(dst, r0, r1);
937   }
938 }
939 
940 
SetCallKind(Register dst,CallKind call_kind)941 void MacroAssembler::SetCallKind(Register dst, CallKind call_kind) {
942   // This macro takes the dst register to make the code more readable
943   // at the call sites. However, the dst register has to be r5 to
944   // follow the calling convention which requires the call type to be
945   // in r5.
946   ASSERT(dst.is(r5));
947   if (call_kind == CALL_AS_FUNCTION) {
948     mov(dst, Operand(Smi::FromInt(1)));
949   } else {
950     mov(dst, Operand(Smi::FromInt(0)));
951   }
952 }
953 
954 
InvokePrologue(const ParameterCount & expected,const ParameterCount & actual,Handle<Code> code_constant,Register code_reg,Label * done,bool * definitely_mismatches,InvokeFlag flag,const CallWrapper & call_wrapper,CallKind call_kind)955 void MacroAssembler::InvokePrologue(const ParameterCount& expected,
956                                     const ParameterCount& actual,
957                                     Handle<Code> code_constant,
958                                     Register code_reg,
959                                     Label* done,
960                                     bool* definitely_mismatches,
961                                     InvokeFlag flag,
962                                     const CallWrapper& call_wrapper,
963                                     CallKind call_kind) {
964   bool definitely_matches = false;
965   *definitely_mismatches = false;
966   Label regular_invoke;
967 
968   // Check whether the expected and actual arguments count match. If not,
969   // setup registers according to contract with ArgumentsAdaptorTrampoline:
970   //  r0: actual arguments count
971   //  r1: function (passed through to callee)
972   //  r2: expected arguments count
973   //  r3: callee code entry
974 
975   // The code below is made a lot easier because the calling code already sets
976   // up actual and expected registers according to the contract if values are
977   // passed in registers.
978   ASSERT(actual.is_immediate() || actual.reg().is(r0));
979   ASSERT(expected.is_immediate() || expected.reg().is(r2));
980   ASSERT((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(r3));
981 
982   if (expected.is_immediate()) {
983     ASSERT(actual.is_immediate());
984     if (expected.immediate() == actual.immediate()) {
985       definitely_matches = true;
986     } else {
987       mov(r0, Operand(actual.immediate()));
988       const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
989       if (expected.immediate() == sentinel) {
990         // Don't worry about adapting arguments for builtins that
991         // don't want that done. Skip adaption code by making it look
992         // like we have a match between expected and actual number of
993         // arguments.
994         definitely_matches = true;
995       } else {
996         *definitely_mismatches = true;
997         mov(r2, Operand(expected.immediate()));
998       }
999     }
1000   } else {
1001     if (actual.is_immediate()) {
1002       cmp(expected.reg(), Operand(actual.immediate()));
1003       b(eq, &regular_invoke);
1004       mov(r0, Operand(actual.immediate()));
1005     } else {
1006       cmp(expected.reg(), Operand(actual.reg()));
1007       b(eq, &regular_invoke);
1008     }
1009   }
1010 
1011   if (!definitely_matches) {
1012     if (!code_constant.is_null()) {
1013       mov(r3, Operand(code_constant));
1014       add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
1015     }
1016 
1017     Handle<Code> adaptor =
1018         isolate()->builtins()->ArgumentsAdaptorTrampoline();
1019     if (flag == CALL_FUNCTION) {
1020       call_wrapper.BeforeCall(CallSize(adaptor));
1021       SetCallKind(r5, call_kind);
1022       Call(adaptor);
1023       call_wrapper.AfterCall();
1024       if (!*definitely_mismatches) {
1025         b(done);
1026       }
1027     } else {
1028       SetCallKind(r5, call_kind);
1029       Jump(adaptor, RelocInfo::CODE_TARGET);
1030     }
1031     bind(&regular_invoke);
1032   }
1033 }
1034 
1035 
InvokeCode(Register code,const ParameterCount & expected,const ParameterCount & actual,InvokeFlag flag,const CallWrapper & call_wrapper,CallKind call_kind)1036 void MacroAssembler::InvokeCode(Register code,
1037                                 const ParameterCount& expected,
1038                                 const ParameterCount& actual,
1039                                 InvokeFlag flag,
1040                                 const CallWrapper& call_wrapper,
1041                                 CallKind call_kind) {
1042   // You can't call a function without a valid frame.
1043   ASSERT(flag == JUMP_FUNCTION || has_frame());
1044 
1045   Label done;
1046   bool definitely_mismatches = false;
1047   InvokePrologue(expected, actual, Handle<Code>::null(), code,
1048                  &done, &definitely_mismatches, flag,
1049                  call_wrapper, call_kind);
1050   if (!definitely_mismatches) {
1051     if (flag == CALL_FUNCTION) {
1052       call_wrapper.BeforeCall(CallSize(code));
1053       SetCallKind(r5, call_kind);
1054       Call(code);
1055       call_wrapper.AfterCall();
1056     } else {
1057       ASSERT(flag == JUMP_FUNCTION);
1058       SetCallKind(r5, call_kind);
1059       Jump(code);
1060     }
1061 
1062     // Continue here if InvokePrologue does handle the invocation due to
1063     // mismatched parameter counts.
1064     bind(&done);
1065   }
1066 }
1067 
1068 
InvokeCode(Handle<Code> code,const ParameterCount & expected,const ParameterCount & actual,RelocInfo::Mode rmode,InvokeFlag flag,CallKind call_kind)1069 void MacroAssembler::InvokeCode(Handle<Code> code,
1070                                 const ParameterCount& expected,
1071                                 const ParameterCount& actual,
1072                                 RelocInfo::Mode rmode,
1073                                 InvokeFlag flag,
1074                                 CallKind call_kind) {
1075   // You can't call a function without a valid frame.
1076   ASSERT(flag == JUMP_FUNCTION || has_frame());
1077 
1078   Label done;
1079   bool definitely_mismatches = false;
1080   InvokePrologue(expected, actual, code, no_reg,
1081                  &done, &definitely_mismatches, flag,
1082                  NullCallWrapper(), call_kind);
1083   if (!definitely_mismatches) {
1084     if (flag == CALL_FUNCTION) {
1085       SetCallKind(r5, call_kind);
1086       Call(code, rmode);
1087     } else {
1088       SetCallKind(r5, call_kind);
1089       Jump(code, rmode);
1090     }
1091 
1092     // Continue here if InvokePrologue does handle the invocation due to
1093     // mismatched parameter counts.
1094     bind(&done);
1095   }
1096 }
1097 
1098 
InvokeFunction(Register fun,const ParameterCount & actual,InvokeFlag flag,const CallWrapper & call_wrapper,CallKind call_kind)1099 void MacroAssembler::InvokeFunction(Register fun,
1100                                     const ParameterCount& actual,
1101                                     InvokeFlag flag,
1102                                     const CallWrapper& call_wrapper,
1103                                     CallKind call_kind) {
1104   // You can't call a function without a valid frame.
1105   ASSERT(flag == JUMP_FUNCTION || has_frame());
1106 
1107   // Contract with called JS functions requires that function is passed in r1.
1108   ASSERT(fun.is(r1));
1109 
1110   Register expected_reg = r2;
1111   Register code_reg = r3;
1112 
1113   ldr(code_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
1114   ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
1115   ldr(expected_reg,
1116       FieldMemOperand(code_reg,
1117                       SharedFunctionInfo::kFormalParameterCountOffset));
1118   mov(expected_reg, Operand(expected_reg, ASR, kSmiTagSize));
1119   ldr(code_reg,
1120       FieldMemOperand(r1, JSFunction::kCodeEntryOffset));
1121 
1122   ParameterCount expected(expected_reg);
1123   InvokeCode(code_reg, expected, actual, flag, call_wrapper, call_kind);
1124 }
1125 
1126 
InvokeFunction(Handle<JSFunction> function,const ParameterCount & actual,InvokeFlag flag,const CallWrapper & call_wrapper,CallKind call_kind)1127 void MacroAssembler::InvokeFunction(Handle<JSFunction> function,
1128                                     const ParameterCount& actual,
1129                                     InvokeFlag flag,
1130                                     const CallWrapper& call_wrapper,
1131                                     CallKind call_kind) {
1132   // You can't call a function without a valid frame.
1133   ASSERT(flag == JUMP_FUNCTION || has_frame());
1134 
1135   // Get the function and setup the context.
1136   LoadHeapObject(r1, function);
1137   ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
1138 
1139   ParameterCount expected(function->shared()->formal_parameter_count());
1140   // We call indirectly through the code field in the function to
1141   // allow recompilation to take effect without changing any of the
1142   // call sites.
1143   ldr(r3, FieldMemOperand(r1, JSFunction::kCodeEntryOffset));
1144   InvokeCode(r3, expected, actual, flag, call_wrapper, call_kind);
1145 }
1146 
1147 
IsObjectJSObjectType(Register heap_object,Register map,Register scratch,Label * fail)1148 void MacroAssembler::IsObjectJSObjectType(Register heap_object,
1149                                           Register map,
1150                                           Register scratch,
1151                                           Label* fail) {
1152   ldr(map, FieldMemOperand(heap_object, HeapObject::kMapOffset));
1153   IsInstanceJSObjectType(map, scratch, fail);
1154 }
1155 
1156 
IsInstanceJSObjectType(Register map,Register scratch,Label * fail)1157 void MacroAssembler::IsInstanceJSObjectType(Register map,
1158                                             Register scratch,
1159                                             Label* fail) {
1160   ldrb(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
1161   cmp(scratch, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
1162   b(lt, fail);
1163   cmp(scratch, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
1164   b(gt, fail);
1165 }
1166 
1167 
IsObjectJSStringType(Register object,Register scratch,Label * fail)1168 void MacroAssembler::IsObjectJSStringType(Register object,
1169                                           Register scratch,
1170                                           Label* fail) {
1171   ASSERT(kNotStringTag != 0);
1172 
1173   ldr(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
1174   ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
1175   tst(scratch, Operand(kIsNotStringMask));
1176   b(ne, fail);
1177 }
1178 
1179 
1180 #ifdef ENABLE_DEBUGGER_SUPPORT
DebugBreak()1181 void MacroAssembler::DebugBreak() {
1182   mov(r0, Operand(0, RelocInfo::NONE));
1183   mov(r1, Operand(ExternalReference(Runtime::kDebugBreak, isolate())));
1184   CEntryStub ces(1);
1185   ASSERT(AllowThisStubCall(&ces));
1186   Call(ces.GetCode(), RelocInfo::DEBUG_BREAK);
1187 }
1188 #endif
1189 
1190 
PushTryHandler(StackHandler::Kind kind,int handler_index)1191 void MacroAssembler::PushTryHandler(StackHandler::Kind kind,
1192                                     int handler_index) {
1193   // Adjust this code if not the case.
1194   STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
1195   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize);
1196   STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
1197   STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
1198   STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
1199   STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
1200 
1201   // For the JSEntry handler, we must preserve r0-r4, r5-r7 are available.
1202   // We will build up the handler from the bottom by pushing on the stack.
1203   // Set up the code object (r5) and the state (r6) for pushing.
1204   unsigned state =
1205       StackHandler::IndexField::encode(handler_index) |
1206       StackHandler::KindField::encode(kind);
1207   mov(r5, Operand(CodeObject()));
1208   mov(r6, Operand(state));
1209 
1210   // Push the frame pointer, context, state, and code object.
1211   if (kind == StackHandler::JS_ENTRY) {
1212     mov(r7, Operand(Smi::FromInt(0)));  // Indicates no context.
1213     mov(ip, Operand(0, RelocInfo::NONE));  // NULL frame pointer.
1214     stm(db_w, sp, r5.bit() | r6.bit() | r7.bit() | ip.bit());
1215   } else {
1216     stm(db_w, sp, r5.bit() | r6.bit() | cp.bit() | fp.bit());
1217   }
1218 
1219   // Link the current handler as the next handler.
1220   mov(r6, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
1221   ldr(r5, MemOperand(r6));
1222   push(r5);
1223   // Set this new handler as the current one.
1224   str(sp, MemOperand(r6));
1225 }
1226 
1227 
PopTryHandler()1228 void MacroAssembler::PopTryHandler() {
1229   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
1230   pop(r1);
1231   mov(ip, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
1232   add(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize));
1233   str(r1, MemOperand(ip));
1234 }
1235 
1236 
JumpToHandlerEntry()1237 void MacroAssembler::JumpToHandlerEntry() {
1238   // Compute the handler entry address and jump to it.  The handler table is
1239   // a fixed array of (smi-tagged) code offsets.
1240   // r0 = exception, r1 = code object, r2 = state.
1241   ldr(r3, FieldMemOperand(r1, Code::kHandlerTableOffset));  // Handler table.
1242   add(r3, r3, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
1243   mov(r2, Operand(r2, LSR, StackHandler::kKindWidth));  // Handler index.
1244   ldr(r2, MemOperand(r3, r2, LSL, kPointerSizeLog2));  // Smi-tagged offset.
1245   add(r1, r1, Operand(Code::kHeaderSize - kHeapObjectTag));  // Code start.
1246   add(pc, r1, Operand(r2, ASR, kSmiTagSize));  // Jump.
1247 }
1248 
1249 
Throw(Register value)1250 void MacroAssembler::Throw(Register value) {
1251   // Adjust this code if not the case.
1252   STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
1253   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
1254   STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
1255   STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
1256   STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
1257   STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
1258 
1259   // The exception is expected in r0.
1260   if (!value.is(r0)) {
1261     mov(r0, value);
1262   }
1263   // Drop the stack pointer to the top of the top handler.
1264   mov(r3, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
1265   ldr(sp, MemOperand(r3));
1266   // Restore the next handler.
1267   pop(r2);
1268   str(r2, MemOperand(r3));
1269 
1270   // Get the code object (r1) and state (r2).  Restore the context and frame
1271   // pointer.
1272   ldm(ia_w, sp, r1.bit() | r2.bit() | cp.bit() | fp.bit());
1273 
1274   // If the handler is a JS frame, restore the context to the frame.
1275   // (kind == ENTRY) == (fp == 0) == (cp == 0), so we could test either fp
1276   // or cp.
1277   tst(cp, cp);
1278   str(cp, MemOperand(fp, StandardFrameConstants::kContextOffset), ne);
1279 
1280   JumpToHandlerEntry();
1281 }
1282 
1283 
ThrowUncatchable(Register value)1284 void MacroAssembler::ThrowUncatchable(Register value) {
1285   // Adjust this code if not the case.
1286   STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
1287   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize);
1288   STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
1289   STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
1290   STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
1291   STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
1292 
1293   // The exception is expected in r0.
1294   if (!value.is(r0)) {
1295     mov(r0, value);
1296   }
1297   // Drop the stack pointer to the top of the top stack handler.
1298   mov(r3, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
1299   ldr(sp, MemOperand(r3));
1300 
1301   // Unwind the handlers until the ENTRY handler is found.
1302   Label fetch_next, check_kind;
1303   jmp(&check_kind);
1304   bind(&fetch_next);
1305   ldr(sp, MemOperand(sp, StackHandlerConstants::kNextOffset));
1306 
1307   bind(&check_kind);
1308   STATIC_ASSERT(StackHandler::JS_ENTRY == 0);
1309   ldr(r2, MemOperand(sp, StackHandlerConstants::kStateOffset));
1310   tst(r2, Operand(StackHandler::KindField::kMask));
1311   b(ne, &fetch_next);
1312 
1313   // Set the top handler address to next handler past the top ENTRY handler.
1314   pop(r2);
1315   str(r2, MemOperand(r3));
1316   // Get the code object (r1) and state (r2).  Clear the context and frame
1317   // pointer (0 was saved in the handler).
1318   ldm(ia_w, sp, r1.bit() | r2.bit() | cp.bit() | fp.bit());
1319 
1320   JumpToHandlerEntry();
1321 }
1322 
1323 
CheckAccessGlobalProxy(Register holder_reg,Register scratch,Label * miss)1324 void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
1325                                             Register scratch,
1326                                             Label* miss) {
1327   Label same_contexts;
1328 
1329   ASSERT(!holder_reg.is(scratch));
1330   ASSERT(!holder_reg.is(ip));
1331   ASSERT(!scratch.is(ip));
1332 
1333   // Load current lexical context from the stack frame.
1334   ldr(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
1335   // In debug mode, make sure the lexical context is set.
1336 #ifdef DEBUG
1337   cmp(scratch, Operand(0, RelocInfo::NONE));
1338   Check(ne, "we should not have an empty lexical context");
1339 #endif
1340 
1341   // Load the global context of the current context.
1342   int offset = Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
1343   ldr(scratch, FieldMemOperand(scratch, offset));
1344   ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
1345 
1346   // Check the context is a global context.
1347   if (emit_debug_code()) {
1348     // TODO(119): avoid push(holder_reg)/pop(holder_reg)
1349     // Cannot use ip as a temporary in this verification code. Due to the fact
1350     // that ip is clobbered as part of cmp with an object Operand.
1351     push(holder_reg);  // Temporarily save holder on the stack.
1352     // Read the first word and compare to the global_context_map.
1353     ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
1354     LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
1355     cmp(holder_reg, ip);
1356     Check(eq, "JSGlobalObject::global_context should be a global context.");
1357     pop(holder_reg);  // Restore holder.
1358   }
1359 
1360   // Check if both contexts are the same.
1361   ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
1362   cmp(scratch, Operand(ip));
1363   b(eq, &same_contexts);
1364 
1365   // Check the context is a global context.
1366   if (emit_debug_code()) {
1367     // TODO(119): avoid push(holder_reg)/pop(holder_reg)
1368     // Cannot use ip as a temporary in this verification code. Due to the fact
1369     // that ip is clobbered as part of cmp with an object Operand.
1370     push(holder_reg);  // Temporarily save holder on the stack.
1371     mov(holder_reg, ip);  // Move ip to its holding place.
1372     LoadRoot(ip, Heap::kNullValueRootIndex);
1373     cmp(holder_reg, ip);
1374     Check(ne, "JSGlobalProxy::context() should not be null.");
1375 
1376     ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
1377     LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
1378     cmp(holder_reg, ip);
1379     Check(eq, "JSGlobalObject::global_context should be a global context.");
1380     // Restore ip is not needed. ip is reloaded below.
1381     pop(holder_reg);  // Restore holder.
1382     // Restore ip to holder's context.
1383     ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kContextOffset));
1384   }
1385 
1386   // Check that the security token in the calling global object is
1387   // compatible with the security token in the receiving global
1388   // object.
1389   int token_offset = Context::kHeaderSize +
1390                      Context::SECURITY_TOKEN_INDEX * kPointerSize;
1391 
1392   ldr(scratch, FieldMemOperand(scratch, token_offset));
1393   ldr(ip, FieldMemOperand(ip, token_offset));
1394   cmp(scratch, Operand(ip));
1395   b(ne, miss);
1396 
1397   bind(&same_contexts);
1398 }
1399 
1400 
GetNumberHash(Register t0,Register scratch)1401 void MacroAssembler::GetNumberHash(Register t0, Register scratch) {
1402   // First of all we assign the hash seed to scratch.
1403   LoadRoot(scratch, Heap::kHashSeedRootIndex);
1404   SmiUntag(scratch);
1405 
1406   // Xor original key with a seed.
1407   eor(t0, t0, Operand(scratch));
1408 
1409   // Compute the hash code from the untagged key.  This must be kept in sync
1410   // with ComputeIntegerHash in utils.h.
1411   //
1412   // hash = ~hash + (hash << 15);
1413   mvn(scratch, Operand(t0));
1414   add(t0, scratch, Operand(t0, LSL, 15));
1415   // hash = hash ^ (hash >> 12);
1416   eor(t0, t0, Operand(t0, LSR, 12));
1417   // hash = hash + (hash << 2);
1418   add(t0, t0, Operand(t0, LSL, 2));
1419   // hash = hash ^ (hash >> 4);
1420   eor(t0, t0, Operand(t0, LSR, 4));
1421   // hash = hash * 2057;
1422   mov(scratch, Operand(t0, LSL, 11));
1423   add(t0, t0, Operand(t0, LSL, 3));
1424   add(t0, t0, scratch);
1425   // hash = hash ^ (hash >> 16);
1426   eor(t0, t0, Operand(t0, LSR, 16));
1427 }
1428 
1429 
LoadFromNumberDictionary(Label * miss,Register elements,Register key,Register result,Register t0,Register t1,Register t2)1430 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
1431                                               Register elements,
1432                                               Register key,
1433                                               Register result,
1434                                               Register t0,
1435                                               Register t1,
1436                                               Register t2) {
1437   // Register use:
1438   //
1439   // elements - holds the slow-case elements of the receiver on entry.
1440   //            Unchanged unless 'result' is the same register.
1441   //
1442   // key      - holds the smi key on entry.
1443   //            Unchanged unless 'result' is the same register.
1444   //
1445   // result   - holds the result on exit if the load succeeded.
1446   //            Allowed to be the same as 'key' or 'result'.
1447   //            Unchanged on bailout so 'key' or 'result' can be used
1448   //            in further computation.
1449   //
1450   // Scratch registers:
1451   //
1452   // t0 - holds the untagged key on entry and holds the hash once computed.
1453   //
1454   // t1 - used to hold the capacity mask of the dictionary
1455   //
1456   // t2 - used for the index into the dictionary.
1457   Label done;
1458 
1459   GetNumberHash(t0, t1);
1460 
1461   // Compute the capacity mask.
1462   ldr(t1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset));
1463   mov(t1, Operand(t1, ASR, kSmiTagSize));  // convert smi to int
1464   sub(t1, t1, Operand(1));
1465 
1466   // Generate an unrolled loop that performs a few probes before giving up.
1467   static const int kProbes = 4;
1468   for (int i = 0; i < kProbes; i++) {
1469     // Use t2 for index calculations and keep the hash intact in t0.
1470     mov(t2, t0);
1471     // Compute the masked index: (hash + i + i * i) & mask.
1472     if (i > 0) {
1473       add(t2, t2, Operand(SeededNumberDictionary::GetProbeOffset(i)));
1474     }
1475     and_(t2, t2, Operand(t1));
1476 
1477     // Scale the index by multiplying by the element size.
1478     ASSERT(SeededNumberDictionary::kEntrySize == 3);
1479     add(t2, t2, Operand(t2, LSL, 1));  // t2 = t2 * 3
1480 
1481     // Check if the key is identical to the name.
1482     add(t2, elements, Operand(t2, LSL, kPointerSizeLog2));
1483     ldr(ip, FieldMemOperand(t2, SeededNumberDictionary::kElementsStartOffset));
1484     cmp(key, Operand(ip));
1485     if (i != kProbes - 1) {
1486       b(eq, &done);
1487     } else {
1488       b(ne, miss);
1489     }
1490   }
1491 
1492   bind(&done);
1493   // Check that the value is a normal property.
1494   // t2: elements + (index * kPointerSize)
1495   const int kDetailsOffset =
1496       SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
1497   ldr(t1, FieldMemOperand(t2, kDetailsOffset));
1498   tst(t1, Operand(Smi::FromInt(PropertyDetails::TypeField::kMask)));
1499   b(ne, miss);
1500 
1501   // Get the value at the masked, scaled index and return.
1502   const int kValueOffset =
1503       SeededNumberDictionary::kElementsStartOffset + kPointerSize;
1504   ldr(result, FieldMemOperand(t2, kValueOffset));
1505 }
1506 
1507 
AllocateInNewSpace(int object_size,Register result,Register scratch1,Register scratch2,Label * gc_required,AllocationFlags flags)1508 void MacroAssembler::AllocateInNewSpace(int object_size,
1509                                         Register result,
1510                                         Register scratch1,
1511                                         Register scratch2,
1512                                         Label* gc_required,
1513                                         AllocationFlags flags) {
1514   if (!FLAG_inline_new) {
1515     if (emit_debug_code()) {
1516       // Trash the registers to simulate an allocation failure.
1517       mov(result, Operand(0x7091));
1518       mov(scratch1, Operand(0x7191));
1519       mov(scratch2, Operand(0x7291));
1520     }
1521     jmp(gc_required);
1522     return;
1523   }
1524 
1525   ASSERT(!result.is(scratch1));
1526   ASSERT(!result.is(scratch2));
1527   ASSERT(!scratch1.is(scratch2));
1528   ASSERT(!scratch1.is(ip));
1529   ASSERT(!scratch2.is(ip));
1530 
1531   // Make object size into bytes.
1532   if ((flags & SIZE_IN_WORDS) != 0) {
1533     object_size *= kPointerSize;
1534   }
1535   ASSERT_EQ(0, object_size & kObjectAlignmentMask);
1536 
1537   // Check relative positions of allocation top and limit addresses.
1538   // The values must be adjacent in memory to allow the use of LDM.
1539   // Also, assert that the registers are numbered such that the values
1540   // are loaded in the correct order.
1541   ExternalReference new_space_allocation_top =
1542       ExternalReference::new_space_allocation_top_address(isolate());
1543   ExternalReference new_space_allocation_limit =
1544       ExternalReference::new_space_allocation_limit_address(isolate());
1545   intptr_t top   =
1546       reinterpret_cast<intptr_t>(new_space_allocation_top.address());
1547   intptr_t limit =
1548       reinterpret_cast<intptr_t>(new_space_allocation_limit.address());
1549   ASSERT((limit - top) == kPointerSize);
1550   ASSERT(result.code() < ip.code());
1551 
1552   // Set up allocation top address and object size registers.
1553   Register topaddr = scratch1;
1554   Register obj_size_reg = scratch2;
1555   mov(topaddr, Operand(new_space_allocation_top));
1556   mov(obj_size_reg, Operand(object_size));
1557 
1558   // This code stores a temporary value in ip. This is OK, as the code below
1559   // does not need ip for implicit literal generation.
1560   if ((flags & RESULT_CONTAINS_TOP) == 0) {
1561     // Load allocation top into result and allocation limit into ip.
1562     ldm(ia, topaddr, result.bit() | ip.bit());
1563   } else {
1564     if (emit_debug_code()) {
1565       // Assert that result actually contains top on entry. ip is used
1566       // immediately below so this use of ip does not cause difference with
1567       // respect to register content between debug and release mode.
1568       ldr(ip, MemOperand(topaddr));
1569       cmp(result, ip);
1570       Check(eq, "Unexpected allocation top");
1571     }
1572     // Load allocation limit into ip. Result already contains allocation top.
1573     ldr(ip, MemOperand(topaddr, limit - top));
1574   }
1575 
1576   // Calculate new top and bail out if new space is exhausted. Use result
1577   // to calculate the new top.
1578   add(scratch2, result, Operand(obj_size_reg), SetCC);
1579   b(cs, gc_required);
1580   cmp(scratch2, Operand(ip));
1581   b(hi, gc_required);
1582   str(scratch2, MemOperand(topaddr));
1583 
1584   // Tag object if requested.
1585   if ((flags & TAG_OBJECT) != 0) {
1586     add(result, result, Operand(kHeapObjectTag));
1587   }
1588 }
1589 
1590 
AllocateInNewSpace(Register object_size,Register result,Register scratch1,Register scratch2,Label * gc_required,AllocationFlags flags)1591 void MacroAssembler::AllocateInNewSpace(Register object_size,
1592                                         Register result,
1593                                         Register scratch1,
1594                                         Register scratch2,
1595                                         Label* gc_required,
1596                                         AllocationFlags flags) {
1597   if (!FLAG_inline_new) {
1598     if (emit_debug_code()) {
1599       // Trash the registers to simulate an allocation failure.
1600       mov(result, Operand(0x7091));
1601       mov(scratch1, Operand(0x7191));
1602       mov(scratch2, Operand(0x7291));
1603     }
1604     jmp(gc_required);
1605     return;
1606   }
1607 
1608   // Assert that the register arguments are different and that none of
1609   // them are ip. ip is used explicitly in the code generated below.
1610   ASSERT(!result.is(scratch1));
1611   ASSERT(!result.is(scratch2));
1612   ASSERT(!scratch1.is(scratch2));
1613   ASSERT(!object_size.is(ip));
1614   ASSERT(!result.is(ip));
1615   ASSERT(!scratch1.is(ip));
1616   ASSERT(!scratch2.is(ip));
1617 
1618   // Check relative positions of allocation top and limit addresses.
1619   // The values must be adjacent in memory to allow the use of LDM.
1620   // Also, assert that the registers are numbered such that the values
1621   // are loaded in the correct order.
1622   ExternalReference new_space_allocation_top =
1623       ExternalReference::new_space_allocation_top_address(isolate());
1624   ExternalReference new_space_allocation_limit =
1625       ExternalReference::new_space_allocation_limit_address(isolate());
1626   intptr_t top =
1627       reinterpret_cast<intptr_t>(new_space_allocation_top.address());
1628   intptr_t limit =
1629       reinterpret_cast<intptr_t>(new_space_allocation_limit.address());
1630   ASSERT((limit - top) == kPointerSize);
1631   ASSERT(result.code() < ip.code());
1632 
1633   // Set up allocation top address.
1634   Register topaddr = scratch1;
1635   mov(topaddr, Operand(new_space_allocation_top));
1636 
1637   // This code stores a temporary value in ip. This is OK, as the code below
1638   // does not need ip for implicit literal generation.
1639   if ((flags & RESULT_CONTAINS_TOP) == 0) {
1640     // Load allocation top into result and allocation limit into ip.
1641     ldm(ia, topaddr, result.bit() | ip.bit());
1642   } else {
1643     if (emit_debug_code()) {
1644       // Assert that result actually contains top on entry. ip is used
1645       // immediately below so this use of ip does not cause difference with
1646       // respect to register content between debug and release mode.
1647       ldr(ip, MemOperand(topaddr));
1648       cmp(result, ip);
1649       Check(eq, "Unexpected allocation top");
1650     }
1651     // Load allocation limit into ip. Result already contains allocation top.
1652     ldr(ip, MemOperand(topaddr, limit - top));
1653   }
1654 
1655   // Calculate new top and bail out if new space is exhausted. Use result
1656   // to calculate the new top. Object size may be in words so a shift is
1657   // required to get the number of bytes.
1658   if ((flags & SIZE_IN_WORDS) != 0) {
1659     add(scratch2, result, Operand(object_size, LSL, kPointerSizeLog2), SetCC);
1660   } else {
1661     add(scratch2, result, Operand(object_size), SetCC);
1662   }
1663   b(cs, gc_required);
1664   cmp(scratch2, Operand(ip));
1665   b(hi, gc_required);
1666 
1667   // Update allocation top. result temporarily holds the new top.
1668   if (emit_debug_code()) {
1669     tst(scratch2, Operand(kObjectAlignmentMask));
1670     Check(eq, "Unaligned allocation in new space");
1671   }
1672   str(scratch2, MemOperand(topaddr));
1673 
1674   // Tag object if requested.
1675   if ((flags & TAG_OBJECT) != 0) {
1676     add(result, result, Operand(kHeapObjectTag));
1677   }
1678 }
1679 
1680 
UndoAllocationInNewSpace(Register object,Register scratch)1681 void MacroAssembler::UndoAllocationInNewSpace(Register object,
1682                                               Register scratch) {
1683   ExternalReference new_space_allocation_top =
1684       ExternalReference::new_space_allocation_top_address(isolate());
1685 
1686   // Make sure the object has no tag before resetting top.
1687   and_(object, object, Operand(~kHeapObjectTagMask));
1688 #ifdef DEBUG
1689   // Check that the object un-allocated is below the current top.
1690   mov(scratch, Operand(new_space_allocation_top));
1691   ldr(scratch, MemOperand(scratch));
1692   cmp(object, scratch);
1693   Check(lt, "Undo allocation of non allocated memory");
1694 #endif
1695   // Write the address of the object to un-allocate as the current top.
1696   mov(scratch, Operand(new_space_allocation_top));
1697   str(object, MemOperand(scratch));
1698 }
1699 
1700 
AllocateTwoByteString(Register result,Register length,Register scratch1,Register scratch2,Register scratch3,Label * gc_required)1701 void MacroAssembler::AllocateTwoByteString(Register result,
1702                                            Register length,
1703                                            Register scratch1,
1704                                            Register scratch2,
1705                                            Register scratch3,
1706                                            Label* gc_required) {
1707   // Calculate the number of bytes needed for the characters in the string while
1708   // observing object alignment.
1709   ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
1710   mov(scratch1, Operand(length, LSL, 1));  // Length in bytes, not chars.
1711   add(scratch1, scratch1,
1712       Operand(kObjectAlignmentMask + SeqTwoByteString::kHeaderSize));
1713   and_(scratch1, scratch1, Operand(~kObjectAlignmentMask));
1714 
1715   // Allocate two-byte string in new space.
1716   AllocateInNewSpace(scratch1,
1717                      result,
1718                      scratch2,
1719                      scratch3,
1720                      gc_required,
1721                      TAG_OBJECT);
1722 
1723   // Set the map, length and hash field.
1724   InitializeNewString(result,
1725                       length,
1726                       Heap::kStringMapRootIndex,
1727                       scratch1,
1728                       scratch2);
1729 }
1730 
1731 
AllocateAsciiString(Register result,Register length,Register scratch1,Register scratch2,Register scratch3,Label * gc_required)1732 void MacroAssembler::AllocateAsciiString(Register result,
1733                                          Register length,
1734                                          Register scratch1,
1735                                          Register scratch2,
1736                                          Register scratch3,
1737                                          Label* gc_required) {
1738   // Calculate the number of bytes needed for the characters in the string while
1739   // observing object alignment.
1740   ASSERT((SeqAsciiString::kHeaderSize & kObjectAlignmentMask) == 0);
1741   ASSERT(kCharSize == 1);
1742   add(scratch1, length,
1743       Operand(kObjectAlignmentMask + SeqAsciiString::kHeaderSize));
1744   and_(scratch1, scratch1, Operand(~kObjectAlignmentMask));
1745 
1746   // Allocate ASCII string in new space.
1747   AllocateInNewSpace(scratch1,
1748                      result,
1749                      scratch2,
1750                      scratch3,
1751                      gc_required,
1752                      TAG_OBJECT);
1753 
1754   // Set the map, length and hash field.
1755   InitializeNewString(result,
1756                       length,
1757                       Heap::kAsciiStringMapRootIndex,
1758                       scratch1,
1759                       scratch2);
1760 }
1761 
1762 
AllocateTwoByteConsString(Register result,Register length,Register scratch1,Register scratch2,Label * gc_required)1763 void MacroAssembler::AllocateTwoByteConsString(Register result,
1764                                                Register length,
1765                                                Register scratch1,
1766                                                Register scratch2,
1767                                                Label* gc_required) {
1768   AllocateInNewSpace(ConsString::kSize,
1769                      result,
1770                      scratch1,
1771                      scratch2,
1772                      gc_required,
1773                      TAG_OBJECT);
1774 
1775   InitializeNewString(result,
1776                       length,
1777                       Heap::kConsStringMapRootIndex,
1778                       scratch1,
1779                       scratch2);
1780 }
1781 
1782 
AllocateAsciiConsString(Register result,Register length,Register scratch1,Register scratch2,Label * gc_required)1783 void MacroAssembler::AllocateAsciiConsString(Register result,
1784                                              Register length,
1785                                              Register scratch1,
1786                                              Register scratch2,
1787                                              Label* gc_required) {
1788   AllocateInNewSpace(ConsString::kSize,
1789                      result,
1790                      scratch1,
1791                      scratch2,
1792                      gc_required,
1793                      TAG_OBJECT);
1794 
1795   InitializeNewString(result,
1796                       length,
1797                       Heap::kConsAsciiStringMapRootIndex,
1798                       scratch1,
1799                       scratch2);
1800 }
1801 
1802 
AllocateTwoByteSlicedString(Register result,Register length,Register scratch1,Register scratch2,Label * gc_required)1803 void MacroAssembler::AllocateTwoByteSlicedString(Register result,
1804                                                  Register length,
1805                                                  Register scratch1,
1806                                                  Register scratch2,
1807                                                  Label* gc_required) {
1808   AllocateInNewSpace(SlicedString::kSize,
1809                      result,
1810                      scratch1,
1811                      scratch2,
1812                      gc_required,
1813                      TAG_OBJECT);
1814 
1815   InitializeNewString(result,
1816                       length,
1817                       Heap::kSlicedStringMapRootIndex,
1818                       scratch1,
1819                       scratch2);
1820 }
1821 
1822 
AllocateAsciiSlicedString(Register result,Register length,Register scratch1,Register scratch2,Label * gc_required)1823 void MacroAssembler::AllocateAsciiSlicedString(Register result,
1824                                                Register length,
1825                                                Register scratch1,
1826                                                Register scratch2,
1827                                                Label* gc_required) {
1828   AllocateInNewSpace(SlicedString::kSize,
1829                      result,
1830                      scratch1,
1831                      scratch2,
1832                      gc_required,
1833                      TAG_OBJECT);
1834 
1835   InitializeNewString(result,
1836                       length,
1837                       Heap::kSlicedAsciiStringMapRootIndex,
1838                       scratch1,
1839                       scratch2);
1840 }
1841 
1842 
CompareObjectType(Register object,Register map,Register type_reg,InstanceType type)1843 void MacroAssembler::CompareObjectType(Register object,
1844                                        Register map,
1845                                        Register type_reg,
1846                                        InstanceType type) {
1847   ldr(map, FieldMemOperand(object, HeapObject::kMapOffset));
1848   CompareInstanceType(map, type_reg, type);
1849 }
1850 
1851 
CompareInstanceType(Register map,Register type_reg,InstanceType type)1852 void MacroAssembler::CompareInstanceType(Register map,
1853                                          Register type_reg,
1854                                          InstanceType type) {
1855   ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
1856   cmp(type_reg, Operand(type));
1857 }
1858 
1859 
CompareRoot(Register obj,Heap::RootListIndex index)1860 void MacroAssembler::CompareRoot(Register obj,
1861                                  Heap::RootListIndex index) {
1862   ASSERT(!obj.is(ip));
1863   LoadRoot(ip, index);
1864   cmp(obj, ip);
1865 }
1866 
1867 
CheckFastElements(Register map,Register scratch,Label * fail)1868 void MacroAssembler::CheckFastElements(Register map,
1869                                        Register scratch,
1870                                        Label* fail) {
1871   STATIC_ASSERT(FAST_SMI_ONLY_ELEMENTS == 0);
1872   STATIC_ASSERT(FAST_ELEMENTS == 1);
1873   ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset));
1874   cmp(scratch, Operand(Map::kMaximumBitField2FastElementValue));
1875   b(hi, fail);
1876 }
1877 
1878 
CheckFastObjectElements(Register map,Register scratch,Label * fail)1879 void MacroAssembler::CheckFastObjectElements(Register map,
1880                                              Register scratch,
1881                                              Label* fail) {
1882   STATIC_ASSERT(FAST_SMI_ONLY_ELEMENTS == 0);
1883   STATIC_ASSERT(FAST_ELEMENTS == 1);
1884   ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset));
1885   cmp(scratch, Operand(Map::kMaximumBitField2FastSmiOnlyElementValue));
1886   b(ls, fail);
1887   cmp(scratch, Operand(Map::kMaximumBitField2FastElementValue));
1888   b(hi, fail);
1889 }
1890 
1891 
CheckFastSmiOnlyElements(Register map,Register scratch,Label * fail)1892 void MacroAssembler::CheckFastSmiOnlyElements(Register map,
1893                                               Register scratch,
1894                                               Label* fail) {
1895   STATIC_ASSERT(FAST_SMI_ONLY_ELEMENTS == 0);
1896   ldrb(scratch, FieldMemOperand(map, Map::kBitField2Offset));
1897   cmp(scratch, Operand(Map::kMaximumBitField2FastSmiOnlyElementValue));
1898   b(hi, fail);
1899 }
1900 
1901 
StoreNumberToDoubleElements(Register value_reg,Register key_reg,Register receiver_reg,Register elements_reg,Register scratch1,Register scratch2,Register scratch3,Register scratch4,Label * fail)1902 void MacroAssembler::StoreNumberToDoubleElements(Register value_reg,
1903                                                  Register key_reg,
1904                                                  Register receiver_reg,
1905                                                  Register elements_reg,
1906                                                  Register scratch1,
1907                                                  Register scratch2,
1908                                                  Register scratch3,
1909                                                  Register scratch4,
1910                                                  Label* fail) {
1911   Label smi_value, maybe_nan, have_double_value, is_nan, done;
1912   Register mantissa_reg = scratch2;
1913   Register exponent_reg = scratch3;
1914 
1915   // Handle smi values specially.
1916   JumpIfSmi(value_reg, &smi_value);
1917 
1918   // Ensure that the object is a heap number
1919   CheckMap(value_reg,
1920            scratch1,
1921            isolate()->factory()->heap_number_map(),
1922            fail,
1923            DONT_DO_SMI_CHECK);
1924 
1925   // Check for nan: all NaN values have a value greater (signed) than 0x7ff00000
1926   // in the exponent.
1927   mov(scratch1, Operand(kNaNOrInfinityLowerBoundUpper32));
1928   ldr(exponent_reg, FieldMemOperand(value_reg, HeapNumber::kExponentOffset));
1929   cmp(exponent_reg, scratch1);
1930   b(ge, &maybe_nan);
1931 
1932   ldr(mantissa_reg, FieldMemOperand(value_reg, HeapNumber::kMantissaOffset));
1933 
1934   bind(&have_double_value);
1935   add(scratch1, elements_reg,
1936       Operand(key_reg, LSL, kDoubleSizeLog2 - kSmiTagSize));
1937   str(mantissa_reg, FieldMemOperand(scratch1, FixedDoubleArray::kHeaderSize));
1938   uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32);
1939   str(exponent_reg, FieldMemOperand(scratch1, offset));
1940   jmp(&done);
1941 
1942   bind(&maybe_nan);
1943   // Could be NaN or Infinity. If fraction is not zero, it's NaN, otherwise
1944   // it's an Infinity, and the non-NaN code path applies.
1945   b(gt, &is_nan);
1946   ldr(mantissa_reg, FieldMemOperand(value_reg, HeapNumber::kMantissaOffset));
1947   cmp(mantissa_reg, Operand(0));
1948   b(eq, &have_double_value);
1949   bind(&is_nan);
1950   // Load canonical NaN for storing into the double array.
1951   uint64_t nan_int64 = BitCast<uint64_t>(
1952       FixedDoubleArray::canonical_not_the_hole_nan_as_double());
1953   mov(mantissa_reg, Operand(static_cast<uint32_t>(nan_int64)));
1954   mov(exponent_reg, Operand(static_cast<uint32_t>(nan_int64 >> 32)));
1955   jmp(&have_double_value);
1956 
1957   bind(&smi_value);
1958   add(scratch1, elements_reg,
1959       Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag));
1960   add(scratch1, scratch1,
1961       Operand(key_reg, LSL, kDoubleSizeLog2 - kSmiTagSize));
1962   // scratch1 is now effective address of the double element
1963 
1964   FloatingPointHelper::Destination destination;
1965   if (CpuFeatures::IsSupported(VFP3)) {
1966     destination = FloatingPointHelper::kVFPRegisters;
1967   } else {
1968     destination = FloatingPointHelper::kCoreRegisters;
1969   }
1970 
1971   Register untagged_value = receiver_reg;
1972   SmiUntag(untagged_value, value_reg);
1973   FloatingPointHelper::ConvertIntToDouble(this,
1974                                           untagged_value,
1975                                           destination,
1976                                           d0,
1977                                           mantissa_reg,
1978                                           exponent_reg,
1979                                           scratch4,
1980                                           s2);
1981   if (destination == FloatingPointHelper::kVFPRegisters) {
1982     CpuFeatures::Scope scope(VFP3);
1983     vstr(d0, scratch1, 0);
1984   } else {
1985     str(mantissa_reg, MemOperand(scratch1, 0));
1986     str(exponent_reg, MemOperand(scratch1, Register::kSizeInBytes));
1987   }
1988   bind(&done);
1989 }
1990 
1991 
CompareMap(Register obj,Register scratch,Handle<Map> map,Label * early_success,CompareMapMode mode)1992 void MacroAssembler::CompareMap(Register obj,
1993                                 Register scratch,
1994                                 Handle<Map> map,
1995                                 Label* early_success,
1996                                 CompareMapMode mode) {
1997   ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
1998   cmp(scratch, Operand(map));
1999   if (mode == ALLOW_ELEMENT_TRANSITION_MAPS) {
2000     Map* transitioned_fast_element_map(
2001         map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL));
2002     ASSERT(transitioned_fast_element_map == NULL ||
2003            map->elements_kind() != FAST_ELEMENTS);
2004     if (transitioned_fast_element_map != NULL) {
2005       b(eq, early_success);
2006       cmp(scratch, Operand(Handle<Map>(transitioned_fast_element_map)));
2007     }
2008 
2009     Map* transitioned_double_map(
2010         map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL));
2011     ASSERT(transitioned_double_map == NULL ||
2012            map->elements_kind() == FAST_SMI_ONLY_ELEMENTS);
2013     if (transitioned_double_map != NULL) {
2014       b(eq, early_success);
2015       cmp(scratch, Operand(Handle<Map>(transitioned_double_map)));
2016     }
2017   }
2018 }
2019 
2020 
CheckMap(Register obj,Register scratch,Handle<Map> map,Label * fail,SmiCheckType smi_check_type,CompareMapMode mode)2021 void MacroAssembler::CheckMap(Register obj,
2022                               Register scratch,
2023                               Handle<Map> map,
2024                               Label* fail,
2025                               SmiCheckType smi_check_type,
2026                               CompareMapMode mode) {
2027   if (smi_check_type == DO_SMI_CHECK) {
2028     JumpIfSmi(obj, fail);
2029   }
2030 
2031   Label success;
2032   CompareMap(obj, scratch, map, &success, mode);
2033   b(ne, fail);
2034   bind(&success);
2035 }
2036 
2037 
CheckMap(Register obj,Register scratch,Heap::RootListIndex index,Label * fail,SmiCheckType smi_check_type)2038 void MacroAssembler::CheckMap(Register obj,
2039                               Register scratch,
2040                               Heap::RootListIndex index,
2041                               Label* fail,
2042                               SmiCheckType smi_check_type) {
2043   if (smi_check_type == DO_SMI_CHECK) {
2044     JumpIfSmi(obj, fail);
2045   }
2046   ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
2047   LoadRoot(ip, index);
2048   cmp(scratch, ip);
2049   b(ne, fail);
2050 }
2051 
2052 
DispatchMap(Register obj,Register scratch,Handle<Map> map,Handle<Code> success,SmiCheckType smi_check_type)2053 void MacroAssembler::DispatchMap(Register obj,
2054                                  Register scratch,
2055                                  Handle<Map> map,
2056                                  Handle<Code> success,
2057                                  SmiCheckType smi_check_type) {
2058   Label fail;
2059   if (smi_check_type == DO_SMI_CHECK) {
2060     JumpIfSmi(obj, &fail);
2061   }
2062   ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
2063   mov(ip, Operand(map));
2064   cmp(scratch, ip);
2065   Jump(success, RelocInfo::CODE_TARGET, eq);
2066   bind(&fail);
2067 }
2068 
2069 
TryGetFunctionPrototype(Register function,Register result,Register scratch,Label * miss,bool miss_on_bound_function)2070 void MacroAssembler::TryGetFunctionPrototype(Register function,
2071                                              Register result,
2072                                              Register scratch,
2073                                              Label* miss,
2074                                              bool miss_on_bound_function) {
2075   // Check that the receiver isn't a smi.
2076   JumpIfSmi(function, miss);
2077 
2078   // Check that the function really is a function.  Load map into result reg.
2079   CompareObjectType(function, result, scratch, JS_FUNCTION_TYPE);
2080   b(ne, miss);
2081 
2082   if (miss_on_bound_function) {
2083     ldr(scratch,
2084         FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
2085     ldr(scratch,
2086         FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
2087     tst(scratch,
2088         Operand(Smi::FromInt(1 << SharedFunctionInfo::kBoundFunction)));
2089     b(ne, miss);
2090   }
2091 
2092   // Make sure that the function has an instance prototype.
2093   Label non_instance;
2094   ldrb(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
2095   tst(scratch, Operand(1 << Map::kHasNonInstancePrototype));
2096   b(ne, &non_instance);
2097 
2098   // Get the prototype or initial map from the function.
2099   ldr(result,
2100       FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
2101 
2102   // If the prototype or initial map is the hole, don't return it and
2103   // simply miss the cache instead. This will allow us to allocate a
2104   // prototype object on-demand in the runtime system.
2105   LoadRoot(ip, Heap::kTheHoleValueRootIndex);
2106   cmp(result, ip);
2107   b(eq, miss);
2108 
2109   // If the function does not have an initial map, we're done.
2110   Label done;
2111   CompareObjectType(result, scratch, scratch, MAP_TYPE);
2112   b(ne, &done);
2113 
2114   // Get the prototype from the initial map.
2115   ldr(result, FieldMemOperand(result, Map::kPrototypeOffset));
2116   jmp(&done);
2117 
2118   // Non-instance prototype: Fetch prototype from constructor field
2119   // in initial map.
2120   bind(&non_instance);
2121   ldr(result, FieldMemOperand(result, Map::kConstructorOffset));
2122 
2123   // All done.
2124   bind(&done);
2125 }
2126 
2127 
CallStub(CodeStub * stub,Condition cond)2128 void MacroAssembler::CallStub(CodeStub* stub, Condition cond) {
2129   ASSERT(AllowThisStubCall(stub));  // Stub calls are not allowed in some stubs.
2130   Call(stub->GetCode(), RelocInfo::CODE_TARGET, kNoASTId, cond);
2131 }
2132 
2133 
TailCallStub(CodeStub * stub,Condition cond)2134 void MacroAssembler::TailCallStub(CodeStub* stub, Condition cond) {
2135   ASSERT(allow_stub_calls_ || stub->CompilingCallsToThisStubIsGCSafe());
2136   Jump(stub->GetCode(), RelocInfo::CODE_TARGET, cond);
2137 }
2138 
2139 
AddressOffset(ExternalReference ref0,ExternalReference ref1)2140 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
2141   return ref0.address() - ref1.address();
2142 }
2143 
2144 
CallApiFunctionAndReturn(ExternalReference function,int stack_space)2145 void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
2146                                               int stack_space) {
2147   ExternalReference next_address =
2148       ExternalReference::handle_scope_next_address();
2149   const int kNextOffset = 0;
2150   const int kLimitOffset = AddressOffset(
2151       ExternalReference::handle_scope_limit_address(),
2152       next_address);
2153   const int kLevelOffset = AddressOffset(
2154       ExternalReference::handle_scope_level_address(),
2155       next_address);
2156 
2157   // Allocate HandleScope in callee-save registers.
2158   mov(r7, Operand(next_address));
2159   ldr(r4, MemOperand(r7, kNextOffset));
2160   ldr(r5, MemOperand(r7, kLimitOffset));
2161   ldr(r6, MemOperand(r7, kLevelOffset));
2162   add(r6, r6, Operand(1));
2163   str(r6, MemOperand(r7, kLevelOffset));
2164 
2165   // Native call returns to the DirectCEntry stub which redirects to the
2166   // return address pushed on stack (could have moved after GC).
2167   // DirectCEntry stub itself is generated early and never moves.
2168   DirectCEntryStub stub;
2169   stub.GenerateCall(this, function);
2170 
2171   Label promote_scheduled_exception;
2172   Label delete_allocated_handles;
2173   Label leave_exit_frame;
2174 
2175   // If result is non-zero, dereference to get the result value
2176   // otherwise set it to undefined.
2177   cmp(r0, Operand(0));
2178   LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
2179   ldr(r0, MemOperand(r0), ne);
2180 
2181   // No more valid handles (the result handle was the last one). Restore
2182   // previous handle scope.
2183   str(r4, MemOperand(r7, kNextOffset));
2184   if (emit_debug_code()) {
2185     ldr(r1, MemOperand(r7, kLevelOffset));
2186     cmp(r1, r6);
2187     Check(eq, "Unexpected level after return from api call");
2188   }
2189   sub(r6, r6, Operand(1));
2190   str(r6, MemOperand(r7, kLevelOffset));
2191   ldr(ip, MemOperand(r7, kLimitOffset));
2192   cmp(r5, ip);
2193   b(ne, &delete_allocated_handles);
2194 
2195   // Check if the function scheduled an exception.
2196   bind(&leave_exit_frame);
2197   LoadRoot(r4, Heap::kTheHoleValueRootIndex);
2198   mov(ip, Operand(ExternalReference::scheduled_exception_address(isolate())));
2199   ldr(r5, MemOperand(ip));
2200   cmp(r4, r5);
2201   b(ne, &promote_scheduled_exception);
2202 
2203   // LeaveExitFrame expects unwind space to be in a register.
2204   mov(r4, Operand(stack_space));
2205   LeaveExitFrame(false, r4);
2206   mov(pc, lr);
2207 
2208   bind(&promote_scheduled_exception);
2209   TailCallExternalReference(
2210       ExternalReference(Runtime::kPromoteScheduledException, isolate()),
2211       0,
2212       1);
2213 
2214   // HandleScope limit has changed. Delete allocated extensions.
2215   bind(&delete_allocated_handles);
2216   str(r5, MemOperand(r7, kLimitOffset));
2217   mov(r4, r0);
2218   PrepareCallCFunction(1, r5);
2219   mov(r0, Operand(ExternalReference::isolate_address()));
2220   CallCFunction(
2221       ExternalReference::delete_handle_scope_extensions(isolate()), 1);
2222   mov(r0, r4);
2223   jmp(&leave_exit_frame);
2224 }
2225 
2226 
AllowThisStubCall(CodeStub * stub)2227 bool MacroAssembler::AllowThisStubCall(CodeStub* stub) {
2228   if (!has_frame_ && stub->SometimesSetsUpAFrame()) return false;
2229   return allow_stub_calls_ || stub->CompilingCallsToThisStubIsGCSafe();
2230 }
2231 
2232 
IllegalOperation(int num_arguments)2233 void MacroAssembler::IllegalOperation(int num_arguments) {
2234   if (num_arguments > 0) {
2235     add(sp, sp, Operand(num_arguments * kPointerSize));
2236   }
2237   LoadRoot(r0, Heap::kUndefinedValueRootIndex);
2238 }
2239 
2240 
IndexFromHash(Register hash,Register index)2241 void MacroAssembler::IndexFromHash(Register hash, Register index) {
2242   // If the hash field contains an array index pick it out. The assert checks
2243   // that the constants for the maximum number of digits for an array index
2244   // cached in the hash field and the number of bits reserved for it does not
2245   // conflict.
2246   ASSERT(TenToThe(String::kMaxCachedArrayIndexLength) <
2247          (1 << String::kArrayIndexValueBits));
2248   // We want the smi-tagged index in key.  kArrayIndexValueMask has zeros in
2249   // the low kHashShift bits.
2250   STATIC_ASSERT(kSmiTag == 0);
2251   Ubfx(hash, hash, String::kHashShift, String::kArrayIndexValueBits);
2252   mov(index, Operand(hash, LSL, kSmiTagSize));
2253 }
2254 
2255 
IntegerToDoubleConversionWithVFP3(Register inReg,Register outHighReg,Register outLowReg)2256 void MacroAssembler::IntegerToDoubleConversionWithVFP3(Register inReg,
2257                                                        Register outHighReg,
2258                                                        Register outLowReg) {
2259   // ARMv7 VFP3 instructions to implement integer to double conversion.
2260   mov(r7, Operand(inReg, ASR, kSmiTagSize));
2261   vmov(s15, r7);
2262   vcvt_f64_s32(d7, s15);
2263   vmov(outLowReg, outHighReg, d7);
2264 }
2265 
2266 
ObjectToDoubleVFPRegister(Register object,DwVfpRegister result,Register scratch1,Register scratch2,Register heap_number_map,SwVfpRegister scratch3,Label * not_number,ObjectToDoubleFlags flags)2267 void MacroAssembler::ObjectToDoubleVFPRegister(Register object,
2268                                                DwVfpRegister result,
2269                                                Register scratch1,
2270                                                Register scratch2,
2271                                                Register heap_number_map,
2272                                                SwVfpRegister scratch3,
2273                                                Label* not_number,
2274                                                ObjectToDoubleFlags flags) {
2275   Label done;
2276   if ((flags & OBJECT_NOT_SMI) == 0) {
2277     Label not_smi;
2278     JumpIfNotSmi(object, &not_smi);
2279     // Remove smi tag and convert to double.
2280     mov(scratch1, Operand(object, ASR, kSmiTagSize));
2281     vmov(scratch3, scratch1);
2282     vcvt_f64_s32(result, scratch3);
2283     b(&done);
2284     bind(&not_smi);
2285   }
2286   // Check for heap number and load double value from it.
2287   ldr(scratch1, FieldMemOperand(object, HeapObject::kMapOffset));
2288   sub(scratch2, object, Operand(kHeapObjectTag));
2289   cmp(scratch1, heap_number_map);
2290   b(ne, not_number);
2291   if ((flags & AVOID_NANS_AND_INFINITIES) != 0) {
2292     // If exponent is all ones the number is either a NaN or +/-Infinity.
2293     ldr(scratch1, FieldMemOperand(object, HeapNumber::kExponentOffset));
2294     Sbfx(scratch1,
2295          scratch1,
2296          HeapNumber::kExponentShift,
2297          HeapNumber::kExponentBits);
2298     // All-one value sign extend to -1.
2299     cmp(scratch1, Operand(-1));
2300     b(eq, not_number);
2301   }
2302   vldr(result, scratch2, HeapNumber::kValueOffset);
2303   bind(&done);
2304 }
2305 
2306 
SmiToDoubleVFPRegister(Register smi,DwVfpRegister value,Register scratch1,SwVfpRegister scratch2)2307 void MacroAssembler::SmiToDoubleVFPRegister(Register smi,
2308                                             DwVfpRegister value,
2309                                             Register scratch1,
2310                                             SwVfpRegister scratch2) {
2311   mov(scratch1, Operand(smi, ASR, kSmiTagSize));
2312   vmov(scratch2, scratch1);
2313   vcvt_f64_s32(value, scratch2);
2314 }
2315 
2316 
2317 // Tries to get a signed int32 out of a double precision floating point heap
2318 // number. Rounds towards 0. Branch to 'not_int32' if the double is out of the
2319 // 32bits signed integer range.
ConvertToInt32(Register source,Register dest,Register scratch,Register scratch2,DwVfpRegister double_scratch,Label * not_int32)2320 void MacroAssembler::ConvertToInt32(Register source,
2321                                     Register dest,
2322                                     Register scratch,
2323                                     Register scratch2,
2324                                     DwVfpRegister double_scratch,
2325                                     Label *not_int32) {
2326   if (CpuFeatures::IsSupported(VFP3)) {
2327     CpuFeatures::Scope scope(VFP3);
2328     sub(scratch, source, Operand(kHeapObjectTag));
2329     vldr(double_scratch, scratch, HeapNumber::kValueOffset);
2330     vcvt_s32_f64(double_scratch.low(), double_scratch);
2331     vmov(dest, double_scratch.low());
2332     // Signed vcvt instruction will saturate to the minimum (0x80000000) or
2333     // maximun (0x7fffffff) signed 32bits integer when the double is out of
2334     // range. When substracting one, the minimum signed integer becomes the
2335     // maximun signed integer.
2336     sub(scratch, dest, Operand(1));
2337     cmp(scratch, Operand(LONG_MAX - 1));
2338     // If equal then dest was LONG_MAX, if greater dest was LONG_MIN.
2339     b(ge, not_int32);
2340   } else {
2341     // This code is faster for doubles that are in the ranges -0x7fffffff to
2342     // -0x40000000 or 0x40000000 to 0x7fffffff. This corresponds almost to
2343     // the range of signed int32 values that are not Smis.  Jumps to the label
2344     // 'not_int32' if the double isn't in the range -0x80000000.0 to
2345     // 0x80000000.0 (excluding the endpoints).
2346     Label right_exponent, done;
2347     // Get exponent word.
2348     ldr(scratch, FieldMemOperand(source, HeapNumber::kExponentOffset));
2349     // Get exponent alone in scratch2.
2350     Ubfx(scratch2,
2351          scratch,
2352          HeapNumber::kExponentShift,
2353          HeapNumber::kExponentBits);
2354     // Load dest with zero.  We use this either for the final shift or
2355     // for the answer.
2356     mov(dest, Operand(0, RelocInfo::NONE));
2357     // Check whether the exponent matches a 32 bit signed int that is not a Smi.
2358     // A non-Smi integer is 1.xxx * 2^30 so the exponent is 30 (biased). This is
2359     // the exponent that we are fastest at and also the highest exponent we can
2360     // handle here.
2361     const uint32_t non_smi_exponent = HeapNumber::kExponentBias + 30;
2362     // The non_smi_exponent, 0x41d, is too big for ARM's immediate field so we
2363     // split it up to avoid a constant pool entry.  You can't do that in general
2364     // for cmp because of the overflow flag, but we know the exponent is in the
2365     // range 0-2047 so there is no overflow.
2366     int fudge_factor = 0x400;
2367     sub(scratch2, scratch2, Operand(fudge_factor));
2368     cmp(scratch2, Operand(non_smi_exponent - fudge_factor));
2369     // If we have a match of the int32-but-not-Smi exponent then skip some
2370     // logic.
2371     b(eq, &right_exponent);
2372     // If the exponent is higher than that then go to slow case.  This catches
2373     // numbers that don't fit in a signed int32, infinities and NaNs.
2374     b(gt, not_int32);
2375 
2376     // We know the exponent is smaller than 30 (biased).  If it is less than
2377     // 0 (biased) then the number is smaller in magnitude than 1.0 * 2^0, i.e.
2378     // it rounds to zero.
2379     const uint32_t zero_exponent = HeapNumber::kExponentBias + 0;
2380     sub(scratch2, scratch2, Operand(zero_exponent - fudge_factor), SetCC);
2381     // Dest already has a Smi zero.
2382     b(lt, &done);
2383 
2384     // We have an exponent between 0 and 30 in scratch2.  Subtract from 30 to
2385     // get how much to shift down.
2386     rsb(dest, scratch2, Operand(30));
2387 
2388     bind(&right_exponent);
2389     // Get the top bits of the mantissa.
2390     and_(scratch2, scratch, Operand(HeapNumber::kMantissaMask));
2391     // Put back the implicit 1.
2392     orr(scratch2, scratch2, Operand(1 << HeapNumber::kExponentShift));
2393     // Shift up the mantissa bits to take up the space the exponent used to
2394     // take. We just orred in the implicit bit so that took care of one and
2395     // we want to leave the sign bit 0 so we subtract 2 bits from the shift
2396     // distance.
2397     const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2;
2398     mov(scratch2, Operand(scratch2, LSL, shift_distance));
2399     // Put sign in zero flag.
2400     tst(scratch, Operand(HeapNumber::kSignMask));
2401     // Get the second half of the double. For some exponents we don't
2402     // actually need this because the bits get shifted out again, but
2403     // it's probably slower to test than just to do it.
2404     ldr(scratch, FieldMemOperand(source, HeapNumber::kMantissaOffset));
2405     // Shift down 22 bits to get the last 10 bits.
2406     orr(scratch, scratch2, Operand(scratch, LSR, 32 - shift_distance));
2407     // Move down according to the exponent.
2408     mov(dest, Operand(scratch, LSR, dest));
2409     // Fix sign if sign bit was set.
2410     rsb(dest, dest, Operand(0, RelocInfo::NONE), LeaveCC, ne);
2411     bind(&done);
2412   }
2413 }
2414 
2415 
EmitVFPTruncate(VFPRoundingMode rounding_mode,SwVfpRegister result,DwVfpRegister double_input,Register scratch1,Register scratch2,CheckForInexactConversion check_inexact)2416 void MacroAssembler::EmitVFPTruncate(VFPRoundingMode rounding_mode,
2417                                      SwVfpRegister result,
2418                                      DwVfpRegister double_input,
2419                                      Register scratch1,
2420                                      Register scratch2,
2421                                      CheckForInexactConversion check_inexact) {
2422   ASSERT(CpuFeatures::IsSupported(VFP3));
2423   CpuFeatures::Scope scope(VFP3);
2424   Register prev_fpscr = scratch1;
2425   Register scratch = scratch2;
2426 
2427   int32_t check_inexact_conversion =
2428     (check_inexact == kCheckForInexactConversion) ? kVFPInexactExceptionBit : 0;
2429 
2430   // Set custom FPCSR:
2431   //  - Set rounding mode.
2432   //  - Clear vfp cumulative exception flags.
2433   //  - Make sure Flush-to-zero mode control bit is unset.
2434   vmrs(prev_fpscr);
2435   bic(scratch,
2436       prev_fpscr,
2437       Operand(kVFPExceptionMask |
2438               check_inexact_conversion |
2439               kVFPRoundingModeMask |
2440               kVFPFlushToZeroMask));
2441   // 'Round To Nearest' is encoded by 0b00 so no bits need to be set.
2442   if (rounding_mode != kRoundToNearest) {
2443     orr(scratch, scratch, Operand(rounding_mode));
2444   }
2445   vmsr(scratch);
2446 
2447   // Convert the argument to an integer.
2448   vcvt_s32_f64(result,
2449                double_input,
2450                (rounding_mode == kRoundToZero) ? kDefaultRoundToZero
2451                                                : kFPSCRRounding);
2452 
2453   // Retrieve FPSCR.
2454   vmrs(scratch);
2455   // Restore FPSCR.
2456   vmsr(prev_fpscr);
2457   // Check for vfp exceptions.
2458   tst(scratch, Operand(kVFPExceptionMask | check_inexact_conversion));
2459 }
2460 
2461 
EmitOutOfInt32RangeTruncate(Register result,Register input_high,Register input_low,Register scratch)2462 void MacroAssembler::EmitOutOfInt32RangeTruncate(Register result,
2463                                                  Register input_high,
2464                                                  Register input_low,
2465                                                  Register scratch) {
2466   Label done, normal_exponent, restore_sign;
2467 
2468   // Extract the biased exponent in result.
2469   Ubfx(result,
2470        input_high,
2471        HeapNumber::kExponentShift,
2472        HeapNumber::kExponentBits);
2473 
2474   // Check for Infinity and NaNs, which should return 0.
2475   cmp(result, Operand(HeapNumber::kExponentMask));
2476   mov(result, Operand(0), LeaveCC, eq);
2477   b(eq, &done);
2478 
2479   // Express exponent as delta to (number of mantissa bits + 31).
2480   sub(result,
2481       result,
2482       Operand(HeapNumber::kExponentBias + HeapNumber::kMantissaBits + 31),
2483       SetCC);
2484 
2485   // If the delta is strictly positive, all bits would be shifted away,
2486   // which means that we can return 0.
2487   b(le, &normal_exponent);
2488   mov(result, Operand(0));
2489   b(&done);
2490 
2491   bind(&normal_exponent);
2492   const int kShiftBase = HeapNumber::kNonMantissaBitsInTopWord - 1;
2493   // Calculate shift.
2494   add(scratch, result, Operand(kShiftBase + HeapNumber::kMantissaBits), SetCC);
2495 
2496   // Save the sign.
2497   Register sign = result;
2498   result = no_reg;
2499   and_(sign, input_high, Operand(HeapNumber::kSignMask));
2500 
2501   // Set the implicit 1 before the mantissa part in input_high.
2502   orr(input_high,
2503       input_high,
2504       Operand(1 << HeapNumber::kMantissaBitsInTopWord));
2505   // Shift the mantissa bits to the correct position.
2506   // We don't need to clear non-mantissa bits as they will be shifted away.
2507   // If they weren't, it would mean that the answer is in the 32bit range.
2508   mov(input_high, Operand(input_high, LSL, scratch));
2509 
2510   // Replace the shifted bits with bits from the lower mantissa word.
2511   Label pos_shift, shift_done;
2512   rsb(scratch, scratch, Operand(32), SetCC);
2513   b(&pos_shift, ge);
2514 
2515   // Negate scratch.
2516   rsb(scratch, scratch, Operand(0));
2517   mov(input_low, Operand(input_low, LSL, scratch));
2518   b(&shift_done);
2519 
2520   bind(&pos_shift);
2521   mov(input_low, Operand(input_low, LSR, scratch));
2522 
2523   bind(&shift_done);
2524   orr(input_high, input_high, Operand(input_low));
2525   // Restore sign if necessary.
2526   cmp(sign, Operand(0));
2527   result = sign;
2528   sign = no_reg;
2529   rsb(result, input_high, Operand(0), LeaveCC, ne);
2530   mov(result, input_high, LeaveCC, eq);
2531   bind(&done);
2532 }
2533 
2534 
EmitECMATruncate(Register result,DwVfpRegister double_input,SwVfpRegister single_scratch,Register scratch,Register input_high,Register input_low)2535 void MacroAssembler::EmitECMATruncate(Register result,
2536                                       DwVfpRegister double_input,
2537                                       SwVfpRegister single_scratch,
2538                                       Register scratch,
2539                                       Register input_high,
2540                                       Register input_low) {
2541   CpuFeatures::Scope scope(VFP3);
2542   ASSERT(!input_high.is(result));
2543   ASSERT(!input_low.is(result));
2544   ASSERT(!input_low.is(input_high));
2545   ASSERT(!scratch.is(result) &&
2546          !scratch.is(input_high) &&
2547          !scratch.is(input_low));
2548   ASSERT(!single_scratch.is(double_input.low()) &&
2549          !single_scratch.is(double_input.high()));
2550 
2551   Label done;
2552 
2553   // Clear cumulative exception flags.
2554   ClearFPSCRBits(kVFPExceptionMask, scratch);
2555   // Try a conversion to a signed integer.
2556   vcvt_s32_f64(single_scratch, double_input);
2557   vmov(result, single_scratch);
2558   // Retrieve he FPSCR.
2559   vmrs(scratch);
2560   // Check for overflow and NaNs.
2561   tst(scratch, Operand(kVFPOverflowExceptionBit |
2562                        kVFPUnderflowExceptionBit |
2563                        kVFPInvalidOpExceptionBit));
2564   // If we had no exceptions we are done.
2565   b(eq, &done);
2566 
2567   // Load the double value and perform a manual truncation.
2568   vmov(input_low, input_high, double_input);
2569   EmitOutOfInt32RangeTruncate(result,
2570                               input_high,
2571                               input_low,
2572                               scratch);
2573   bind(&done);
2574 }
2575 
2576 
GetLeastBitsFromSmi(Register dst,Register src,int num_least_bits)2577 void MacroAssembler::GetLeastBitsFromSmi(Register dst,
2578                                          Register src,
2579                                          int num_least_bits) {
2580   if (CpuFeatures::IsSupported(ARMv7)) {
2581     ubfx(dst, src, kSmiTagSize, num_least_bits);
2582   } else {
2583     mov(dst, Operand(src, ASR, kSmiTagSize));
2584     and_(dst, dst, Operand((1 << num_least_bits) - 1));
2585   }
2586 }
2587 
2588 
GetLeastBitsFromInt32(Register dst,Register src,int num_least_bits)2589 void MacroAssembler::GetLeastBitsFromInt32(Register dst,
2590                                            Register src,
2591                                            int num_least_bits) {
2592   and_(dst, src, Operand((1 << num_least_bits) - 1));
2593 }
2594 
2595 
CallRuntime(const Runtime::Function * f,int num_arguments)2596 void MacroAssembler::CallRuntime(const Runtime::Function* f,
2597                                  int num_arguments) {
2598   // All parameters are on the stack.  r0 has the return value after call.
2599 
2600   // If the expected number of arguments of the runtime function is
2601   // constant, we check that the actual number of arguments match the
2602   // expectation.
2603   if (f->nargs >= 0 && f->nargs != num_arguments) {
2604     IllegalOperation(num_arguments);
2605     return;
2606   }
2607 
2608   // TODO(1236192): Most runtime routines don't need the number of
2609   // arguments passed in because it is constant. At some point we
2610   // should remove this need and make the runtime routine entry code
2611   // smarter.
2612   mov(r0, Operand(num_arguments));
2613   mov(r1, Operand(ExternalReference(f, isolate())));
2614   CEntryStub stub(1);
2615   CallStub(&stub);
2616 }
2617 
2618 
CallRuntime(Runtime::FunctionId fid,int num_arguments)2619 void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
2620   CallRuntime(Runtime::FunctionForId(fid), num_arguments);
2621 }
2622 
2623 
CallRuntimeSaveDoubles(Runtime::FunctionId id)2624 void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
2625   const Runtime::Function* function = Runtime::FunctionForId(id);
2626   mov(r0, Operand(function->nargs));
2627   mov(r1, Operand(ExternalReference(function, isolate())));
2628   CEntryStub stub(1, kSaveFPRegs);
2629   CallStub(&stub);
2630 }
2631 
2632 
CallExternalReference(const ExternalReference & ext,int num_arguments)2633 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
2634                                            int num_arguments) {
2635   mov(r0, Operand(num_arguments));
2636   mov(r1, Operand(ext));
2637 
2638   CEntryStub stub(1);
2639   CallStub(&stub);
2640 }
2641 
2642 
TailCallExternalReference(const ExternalReference & ext,int num_arguments,int result_size)2643 void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
2644                                                int num_arguments,
2645                                                int result_size) {
2646   // TODO(1236192): Most runtime routines don't need the number of
2647   // arguments passed in because it is constant. At some point we
2648   // should remove this need and make the runtime routine entry code
2649   // smarter.
2650   mov(r0, Operand(num_arguments));
2651   JumpToExternalReference(ext);
2652 }
2653 
2654 
TailCallRuntime(Runtime::FunctionId fid,int num_arguments,int result_size)2655 void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid,
2656                                      int num_arguments,
2657                                      int result_size) {
2658   TailCallExternalReference(ExternalReference(fid, isolate()),
2659                             num_arguments,
2660                             result_size);
2661 }
2662 
2663 
JumpToExternalReference(const ExternalReference & builtin)2664 void MacroAssembler::JumpToExternalReference(const ExternalReference& builtin) {
2665 #if defined(__thumb__)
2666   // Thumb mode builtin.
2667   ASSERT((reinterpret_cast<intptr_t>(builtin.address()) & 1) == 1);
2668 #endif
2669   mov(r1, Operand(builtin));
2670   CEntryStub stub(1);
2671   Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
2672 }
2673 
2674 
InvokeBuiltin(Builtins::JavaScript id,InvokeFlag flag,const CallWrapper & call_wrapper)2675 void MacroAssembler::InvokeBuiltin(Builtins::JavaScript id,
2676                                    InvokeFlag flag,
2677                                    const CallWrapper& call_wrapper) {
2678   // You can't call a builtin without a valid frame.
2679   ASSERT(flag == JUMP_FUNCTION || has_frame());
2680 
2681   GetBuiltinEntry(r2, id);
2682   if (flag == CALL_FUNCTION) {
2683     call_wrapper.BeforeCall(CallSize(r2));
2684     SetCallKind(r5, CALL_AS_METHOD);
2685     Call(r2);
2686     call_wrapper.AfterCall();
2687   } else {
2688     ASSERT(flag == JUMP_FUNCTION);
2689     SetCallKind(r5, CALL_AS_METHOD);
2690     Jump(r2);
2691   }
2692 }
2693 
2694 
GetBuiltinFunction(Register target,Builtins::JavaScript id)2695 void MacroAssembler::GetBuiltinFunction(Register target,
2696                                         Builtins::JavaScript id) {
2697   // Load the builtins object into target register.
2698   ldr(target, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
2699   ldr(target, FieldMemOperand(target, GlobalObject::kBuiltinsOffset));
2700   // Load the JavaScript builtin function from the builtins object.
2701   ldr(target, FieldMemOperand(target,
2702                           JSBuiltinsObject::OffsetOfFunctionWithId(id)));
2703 }
2704 
2705 
GetBuiltinEntry(Register target,Builtins::JavaScript id)2706 void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
2707   ASSERT(!target.is(r1));
2708   GetBuiltinFunction(r1, id);
2709   // Load the code entry point from the builtins object.
2710   ldr(target, FieldMemOperand(r1, JSFunction::kCodeEntryOffset));
2711 }
2712 
2713 
SetCounter(StatsCounter * counter,int value,Register scratch1,Register scratch2)2714 void MacroAssembler::SetCounter(StatsCounter* counter, int value,
2715                                 Register scratch1, Register scratch2) {
2716   if (FLAG_native_code_counters && counter->Enabled()) {
2717     mov(scratch1, Operand(value));
2718     mov(scratch2, Operand(ExternalReference(counter)));
2719     str(scratch1, MemOperand(scratch2));
2720   }
2721 }
2722 
2723 
IncrementCounter(StatsCounter * counter,int value,Register scratch1,Register scratch2)2724 void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
2725                                       Register scratch1, Register scratch2) {
2726   ASSERT(value > 0);
2727   if (FLAG_native_code_counters && counter->Enabled()) {
2728     mov(scratch2, Operand(ExternalReference(counter)));
2729     ldr(scratch1, MemOperand(scratch2));
2730     add(scratch1, scratch1, Operand(value));
2731     str(scratch1, MemOperand(scratch2));
2732   }
2733 }
2734 
2735 
DecrementCounter(StatsCounter * counter,int value,Register scratch1,Register scratch2)2736 void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
2737                                       Register scratch1, Register scratch2) {
2738   ASSERT(value > 0);
2739   if (FLAG_native_code_counters && counter->Enabled()) {
2740     mov(scratch2, Operand(ExternalReference(counter)));
2741     ldr(scratch1, MemOperand(scratch2));
2742     sub(scratch1, scratch1, Operand(value));
2743     str(scratch1, MemOperand(scratch2));
2744   }
2745 }
2746 
2747 
Assert(Condition cond,const char * msg)2748 void MacroAssembler::Assert(Condition cond, const char* msg) {
2749   if (emit_debug_code())
2750     Check(cond, msg);
2751 }
2752 
2753 
AssertRegisterIsRoot(Register reg,Heap::RootListIndex index)2754 void MacroAssembler::AssertRegisterIsRoot(Register reg,
2755                                           Heap::RootListIndex index) {
2756   if (emit_debug_code()) {
2757     LoadRoot(ip, index);
2758     cmp(reg, ip);
2759     Check(eq, "Register did not match expected root");
2760   }
2761 }
2762 
2763 
AssertFastElements(Register elements)2764 void MacroAssembler::AssertFastElements(Register elements) {
2765   if (emit_debug_code()) {
2766     ASSERT(!elements.is(ip));
2767     Label ok;
2768     push(elements);
2769     ldr(elements, FieldMemOperand(elements, HeapObject::kMapOffset));
2770     LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
2771     cmp(elements, ip);
2772     b(eq, &ok);
2773     LoadRoot(ip, Heap::kFixedDoubleArrayMapRootIndex);
2774     cmp(elements, ip);
2775     b(eq, &ok);
2776     LoadRoot(ip, Heap::kFixedCOWArrayMapRootIndex);
2777     cmp(elements, ip);
2778     b(eq, &ok);
2779     Abort("JSObject with fast elements map has slow elements");
2780     bind(&ok);
2781     pop(elements);
2782   }
2783 }
2784 
2785 
Check(Condition cond,const char * msg)2786 void MacroAssembler::Check(Condition cond, const char* msg) {
2787   Label L;
2788   b(cond, &L);
2789   Abort(msg);
2790   // will not return here
2791   bind(&L);
2792 }
2793 
2794 
Abort(const char * msg)2795 void MacroAssembler::Abort(const char* msg) {
2796   Label abort_start;
2797   bind(&abort_start);
2798   // We want to pass the msg string like a smi to avoid GC
2799   // problems, however msg is not guaranteed to be aligned
2800   // properly. Instead, we pass an aligned pointer that is
2801   // a proper v8 smi, but also pass the alignment difference
2802   // from the real pointer as a smi.
2803   intptr_t p1 = reinterpret_cast<intptr_t>(msg);
2804   intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag;
2805   ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
2806 #ifdef DEBUG
2807   if (msg != NULL) {
2808     RecordComment("Abort message: ");
2809     RecordComment(msg);
2810   }
2811 #endif
2812 
2813   mov(r0, Operand(p0));
2814   push(r0);
2815   mov(r0, Operand(Smi::FromInt(p1 - p0)));
2816   push(r0);
2817   // Disable stub call restrictions to always allow calls to abort.
2818   if (!has_frame_) {
2819     // We don't actually want to generate a pile of code for this, so just
2820     // claim there is a stack frame, without generating one.
2821     FrameScope scope(this, StackFrame::NONE);
2822     CallRuntime(Runtime::kAbort, 2);
2823   } else {
2824     CallRuntime(Runtime::kAbort, 2);
2825   }
2826   // will not return here
2827   if (is_const_pool_blocked()) {
2828     // If the calling code cares about the exact number of
2829     // instructions generated, we insert padding here to keep the size
2830     // of the Abort macro constant.
2831     static const int kExpectedAbortInstructions = 10;
2832     int abort_instructions = InstructionsGeneratedSince(&abort_start);
2833     ASSERT(abort_instructions <= kExpectedAbortInstructions);
2834     while (abort_instructions++ < kExpectedAbortInstructions) {
2835       nop();
2836     }
2837   }
2838 }
2839 
2840 
LoadContext(Register dst,int context_chain_length)2841 void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
2842   if (context_chain_length > 0) {
2843     // Move up the chain of contexts to the context containing the slot.
2844     ldr(dst, MemOperand(cp, Context::SlotOffset(Context::PREVIOUS_INDEX)));
2845     for (int i = 1; i < context_chain_length; i++) {
2846       ldr(dst, MemOperand(dst, Context::SlotOffset(Context::PREVIOUS_INDEX)));
2847     }
2848   } else {
2849     // Slot is in the current function context.  Move it into the
2850     // destination register in case we store into it (the write barrier
2851     // cannot be allowed to destroy the context in esi).
2852     mov(dst, cp);
2853   }
2854 }
2855 
2856 
LoadTransitionedArrayMapConditional(ElementsKind expected_kind,ElementsKind transitioned_kind,Register map_in_out,Register scratch,Label * no_map_match)2857 void MacroAssembler::LoadTransitionedArrayMapConditional(
2858     ElementsKind expected_kind,
2859     ElementsKind transitioned_kind,
2860     Register map_in_out,
2861     Register scratch,
2862     Label* no_map_match) {
2863   // Load the global or builtins object from the current context.
2864   ldr(scratch, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
2865   ldr(scratch, FieldMemOperand(scratch, GlobalObject::kGlobalContextOffset));
2866 
2867   // Check that the function's map is the same as the expected cached map.
2868   int expected_index =
2869       Context::GetContextMapIndexFromElementsKind(expected_kind);
2870   ldr(ip, MemOperand(scratch, Context::SlotOffset(expected_index)));
2871   cmp(map_in_out, ip);
2872   b(ne, no_map_match);
2873 
2874   // Use the transitioned cached map.
2875   int trans_index =
2876       Context::GetContextMapIndexFromElementsKind(transitioned_kind);
2877   ldr(map_in_out, MemOperand(scratch, Context::SlotOffset(trans_index)));
2878 }
2879 
2880 
LoadInitialArrayMap(Register function_in,Register scratch,Register map_out)2881 void MacroAssembler::LoadInitialArrayMap(
2882     Register function_in, Register scratch, Register map_out) {
2883   ASSERT(!function_in.is(map_out));
2884   Label done;
2885   ldr(map_out, FieldMemOperand(function_in,
2886                                JSFunction::kPrototypeOrInitialMapOffset));
2887   if (!FLAG_smi_only_arrays) {
2888     LoadTransitionedArrayMapConditional(FAST_SMI_ONLY_ELEMENTS,
2889                                         FAST_ELEMENTS,
2890                                         map_out,
2891                                         scratch,
2892                                         &done);
2893   }
2894   bind(&done);
2895 }
2896 
2897 
LoadGlobalFunction(int index,Register function)2898 void MacroAssembler::LoadGlobalFunction(int index, Register function) {
2899   // Load the global or builtins object from the current context.
2900   ldr(function, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
2901   // Load the global context from the global or builtins object.
2902   ldr(function, FieldMemOperand(function,
2903                                 GlobalObject::kGlobalContextOffset));
2904   // Load the function from the global context.
2905   ldr(function, MemOperand(function, Context::SlotOffset(index)));
2906 }
2907 
2908 
LoadGlobalFunctionInitialMap(Register function,Register map,Register scratch)2909 void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
2910                                                   Register map,
2911                                                   Register scratch) {
2912   // Load the initial map. The global functions all have initial maps.
2913   ldr(map, FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
2914   if (emit_debug_code()) {
2915     Label ok, fail;
2916     CheckMap(map, scratch, Heap::kMetaMapRootIndex, &fail, DO_SMI_CHECK);
2917     b(&ok);
2918     bind(&fail);
2919     Abort("Global functions must have initial map");
2920     bind(&ok);
2921   }
2922 }
2923 
2924 
JumpIfNotPowerOfTwoOrZero(Register reg,Register scratch,Label * not_power_of_two_or_zero)2925 void MacroAssembler::JumpIfNotPowerOfTwoOrZero(
2926     Register reg,
2927     Register scratch,
2928     Label* not_power_of_two_or_zero) {
2929   sub(scratch, reg, Operand(1), SetCC);
2930   b(mi, not_power_of_two_or_zero);
2931   tst(scratch, reg);
2932   b(ne, not_power_of_two_or_zero);
2933 }
2934 
2935 
JumpIfNotPowerOfTwoOrZeroAndNeg(Register reg,Register scratch,Label * zero_and_neg,Label * not_power_of_two)2936 void MacroAssembler::JumpIfNotPowerOfTwoOrZeroAndNeg(
2937     Register reg,
2938     Register scratch,
2939     Label* zero_and_neg,
2940     Label* not_power_of_two) {
2941   sub(scratch, reg, Operand(1), SetCC);
2942   b(mi, zero_and_neg);
2943   tst(scratch, reg);
2944   b(ne, not_power_of_two);
2945 }
2946 
2947 
JumpIfNotBothSmi(Register reg1,Register reg2,Label * on_not_both_smi)2948 void MacroAssembler::JumpIfNotBothSmi(Register reg1,
2949                                       Register reg2,
2950                                       Label* on_not_both_smi) {
2951   STATIC_ASSERT(kSmiTag == 0);
2952   tst(reg1, Operand(kSmiTagMask));
2953   tst(reg2, Operand(kSmiTagMask), eq);
2954   b(ne, on_not_both_smi);
2955 }
2956 
2957 
UntagAndJumpIfSmi(Register dst,Register src,Label * smi_case)2958 void MacroAssembler::UntagAndJumpIfSmi(
2959     Register dst, Register src, Label* smi_case) {
2960   STATIC_ASSERT(kSmiTag == 0);
2961   mov(dst, Operand(src, ASR, kSmiTagSize), SetCC);
2962   b(cc, smi_case);  // Shifter carry is not set for a smi.
2963 }
2964 
2965 
UntagAndJumpIfNotSmi(Register dst,Register src,Label * non_smi_case)2966 void MacroAssembler::UntagAndJumpIfNotSmi(
2967     Register dst, Register src, Label* non_smi_case) {
2968   STATIC_ASSERT(kSmiTag == 0);
2969   mov(dst, Operand(src, ASR, kSmiTagSize), SetCC);
2970   b(cs, non_smi_case);  // Shifter carry is set for a non-smi.
2971 }
2972 
2973 
JumpIfEitherSmi(Register reg1,Register reg2,Label * on_either_smi)2974 void MacroAssembler::JumpIfEitherSmi(Register reg1,
2975                                      Register reg2,
2976                                      Label* on_either_smi) {
2977   STATIC_ASSERT(kSmiTag == 0);
2978   tst(reg1, Operand(kSmiTagMask));
2979   tst(reg2, Operand(kSmiTagMask), ne);
2980   b(eq, on_either_smi);
2981 }
2982 
2983 
AbortIfSmi(Register object)2984 void MacroAssembler::AbortIfSmi(Register object) {
2985   STATIC_ASSERT(kSmiTag == 0);
2986   tst(object, Operand(kSmiTagMask));
2987   Assert(ne, "Operand is a smi");
2988 }
2989 
2990 
AbortIfNotSmi(Register object)2991 void MacroAssembler::AbortIfNotSmi(Register object) {
2992   STATIC_ASSERT(kSmiTag == 0);
2993   tst(object, Operand(kSmiTagMask));
2994   Assert(eq, "Operand is not smi");
2995 }
2996 
2997 
AbortIfNotString(Register object)2998 void MacroAssembler::AbortIfNotString(Register object) {
2999   STATIC_ASSERT(kSmiTag == 0);
3000   tst(object, Operand(kSmiTagMask));
3001   Assert(ne, "Operand is not a string");
3002   push(object);
3003   ldr(object, FieldMemOperand(object, HeapObject::kMapOffset));
3004   CompareInstanceType(object, object, FIRST_NONSTRING_TYPE);
3005   pop(object);
3006   Assert(lo, "Operand is not a string");
3007 }
3008 
3009 
3010 
AbortIfNotRootValue(Register src,Heap::RootListIndex root_value_index,const char * message)3011 void MacroAssembler::AbortIfNotRootValue(Register src,
3012                                          Heap::RootListIndex root_value_index,
3013                                          const char* message) {
3014   CompareRoot(src, root_value_index);
3015   Assert(eq, message);
3016 }
3017 
3018 
JumpIfNotHeapNumber(Register object,Register heap_number_map,Register scratch,Label * on_not_heap_number)3019 void MacroAssembler::JumpIfNotHeapNumber(Register object,
3020                                          Register heap_number_map,
3021                                          Register scratch,
3022                                          Label* on_not_heap_number) {
3023   ldr(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
3024   AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
3025   cmp(scratch, heap_number_map);
3026   b(ne, on_not_heap_number);
3027 }
3028 
3029 
JumpIfNonSmisNotBothSequentialAsciiStrings(Register first,Register second,Register scratch1,Register scratch2,Label * failure)3030 void MacroAssembler::JumpIfNonSmisNotBothSequentialAsciiStrings(
3031     Register first,
3032     Register second,
3033     Register scratch1,
3034     Register scratch2,
3035     Label* failure) {
3036   // Test that both first and second are sequential ASCII strings.
3037   // Assume that they are non-smis.
3038   ldr(scratch1, FieldMemOperand(first, HeapObject::kMapOffset));
3039   ldr(scratch2, FieldMemOperand(second, HeapObject::kMapOffset));
3040   ldrb(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
3041   ldrb(scratch2, FieldMemOperand(scratch2, Map::kInstanceTypeOffset));
3042 
3043   JumpIfBothInstanceTypesAreNotSequentialAscii(scratch1,
3044                                                scratch2,
3045                                                scratch1,
3046                                                scratch2,
3047                                                failure);
3048 }
3049 
JumpIfNotBothSequentialAsciiStrings(Register first,Register second,Register scratch1,Register scratch2,Label * failure)3050 void MacroAssembler::JumpIfNotBothSequentialAsciiStrings(Register first,
3051                                                          Register second,
3052                                                          Register scratch1,
3053                                                          Register scratch2,
3054                                                          Label* failure) {
3055   // Check that neither is a smi.
3056   STATIC_ASSERT(kSmiTag == 0);
3057   and_(scratch1, first, Operand(second));
3058   JumpIfSmi(scratch1, failure);
3059   JumpIfNonSmisNotBothSequentialAsciiStrings(first,
3060                                              second,
3061                                              scratch1,
3062                                              scratch2,
3063                                              failure);
3064 }
3065 
3066 
3067 // Allocates a heap number or jumps to the need_gc label if the young space
3068 // is full and a scavenge is needed.
AllocateHeapNumber(Register result,Register scratch1,Register scratch2,Register heap_number_map,Label * gc_required)3069 void MacroAssembler::AllocateHeapNumber(Register result,
3070                                         Register scratch1,
3071                                         Register scratch2,
3072                                         Register heap_number_map,
3073                                         Label* gc_required) {
3074   // Allocate an object in the heap for the heap number and tag it as a heap
3075   // object.
3076   AllocateInNewSpace(HeapNumber::kSize,
3077                      result,
3078                      scratch1,
3079                      scratch2,
3080                      gc_required,
3081                      TAG_OBJECT);
3082 
3083   // Store heap number map in the allocated object.
3084   AssertRegisterIsRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
3085   str(heap_number_map, FieldMemOperand(result, HeapObject::kMapOffset));
3086 }
3087 
3088 
AllocateHeapNumberWithValue(Register result,DwVfpRegister value,Register scratch1,Register scratch2,Register heap_number_map,Label * gc_required)3089 void MacroAssembler::AllocateHeapNumberWithValue(Register result,
3090                                                  DwVfpRegister value,
3091                                                  Register scratch1,
3092                                                  Register scratch2,
3093                                                  Register heap_number_map,
3094                                                  Label* gc_required) {
3095   AllocateHeapNumber(result, scratch1, scratch2, heap_number_map, gc_required);
3096   sub(scratch1, result, Operand(kHeapObjectTag));
3097   vstr(value, scratch1, HeapNumber::kValueOffset);
3098 }
3099 
3100 
3101 // Copies a fixed number of fields of heap objects from src to dst.
CopyFields(Register dst,Register src,RegList temps,int field_count)3102 void MacroAssembler::CopyFields(Register dst,
3103                                 Register src,
3104                                 RegList temps,
3105                                 int field_count) {
3106   // At least one bit set in the first 15 registers.
3107   ASSERT((temps & ((1 << 15) - 1)) != 0);
3108   ASSERT((temps & dst.bit()) == 0);
3109   ASSERT((temps & src.bit()) == 0);
3110   // Primitive implementation using only one temporary register.
3111 
3112   Register tmp = no_reg;
3113   // Find a temp register in temps list.
3114   for (int i = 0; i < 15; i++) {
3115     if ((temps & (1 << i)) != 0) {
3116       tmp.set_code(i);
3117       break;
3118     }
3119   }
3120   ASSERT(!tmp.is(no_reg));
3121 
3122   for (int i = 0; i < field_count; i++) {
3123     ldr(tmp, FieldMemOperand(src, i * kPointerSize));
3124     str(tmp, FieldMemOperand(dst, i * kPointerSize));
3125   }
3126 }
3127 
3128 
CopyBytes(Register src,Register dst,Register length,Register scratch)3129 void MacroAssembler::CopyBytes(Register src,
3130                                Register dst,
3131                                Register length,
3132                                Register scratch) {
3133   Label align_loop, align_loop_1, word_loop, byte_loop, byte_loop_1, done;
3134 
3135   // Align src before copying in word size chunks.
3136   bind(&align_loop);
3137   cmp(length, Operand(0));
3138   b(eq, &done);
3139   bind(&align_loop_1);
3140   tst(src, Operand(kPointerSize - 1));
3141   b(eq, &word_loop);
3142   ldrb(scratch, MemOperand(src, 1, PostIndex));
3143   strb(scratch, MemOperand(dst, 1, PostIndex));
3144   sub(length, length, Operand(1), SetCC);
3145   b(ne, &byte_loop_1);
3146 
3147   // Copy bytes in word size chunks.
3148   bind(&word_loop);
3149   if (emit_debug_code()) {
3150     tst(src, Operand(kPointerSize - 1));
3151     Assert(eq, "Expecting alignment for CopyBytes");
3152   }
3153   cmp(length, Operand(kPointerSize));
3154   b(lt, &byte_loop);
3155   ldr(scratch, MemOperand(src, kPointerSize, PostIndex));
3156 #if CAN_USE_UNALIGNED_ACCESSES
3157   str(scratch, MemOperand(dst, kPointerSize, PostIndex));
3158 #else
3159   strb(scratch, MemOperand(dst, 1, PostIndex));
3160   mov(scratch, Operand(scratch, LSR, 8));
3161   strb(scratch, MemOperand(dst, 1, PostIndex));
3162   mov(scratch, Operand(scratch, LSR, 8));
3163   strb(scratch, MemOperand(dst, 1, PostIndex));
3164   mov(scratch, Operand(scratch, LSR, 8));
3165   strb(scratch, MemOperand(dst, 1, PostIndex));
3166 #endif
3167   sub(length, length, Operand(kPointerSize));
3168   b(&word_loop);
3169 
3170   // Copy the last bytes if any left.
3171   bind(&byte_loop);
3172   cmp(length, Operand(0));
3173   b(eq, &done);
3174   bind(&byte_loop_1);
3175   ldrb(scratch, MemOperand(src, 1, PostIndex));
3176   strb(scratch, MemOperand(dst, 1, PostIndex));
3177   sub(length, length, Operand(1), SetCC);
3178   b(ne, &byte_loop_1);
3179   bind(&done);
3180 }
3181 
3182 
InitializeFieldsWithFiller(Register start_offset,Register end_offset,Register filler)3183 void MacroAssembler::InitializeFieldsWithFiller(Register start_offset,
3184                                                 Register end_offset,
3185                                                 Register filler) {
3186   Label loop, entry;
3187   b(&entry);
3188   bind(&loop);
3189   str(filler, MemOperand(start_offset, kPointerSize, PostIndex));
3190   bind(&entry);
3191   cmp(start_offset, end_offset);
3192   b(lt, &loop);
3193 }
3194 
3195 
CountLeadingZeros(Register zeros,Register source,Register scratch)3196 void MacroAssembler::CountLeadingZeros(Register zeros,   // Answer.
3197                                        Register source,  // Input.
3198                                        Register scratch) {
3199   ASSERT(!zeros.is(source) || !source.is(scratch));
3200   ASSERT(!zeros.is(scratch));
3201   ASSERT(!scratch.is(ip));
3202   ASSERT(!source.is(ip));
3203   ASSERT(!zeros.is(ip));
3204 #ifdef CAN_USE_ARMV5_INSTRUCTIONS
3205   clz(zeros, source);  // This instruction is only supported after ARM5.
3206 #else
3207   // Order of the next two lines is important: zeros register
3208   // can be the same as source register.
3209   Move(scratch, source);
3210   mov(zeros, Operand(0, RelocInfo::NONE));
3211   // Top 16.
3212   tst(scratch, Operand(0xffff0000));
3213   add(zeros, zeros, Operand(16), LeaveCC, eq);
3214   mov(scratch, Operand(scratch, LSL, 16), LeaveCC, eq);
3215   // Top 8.
3216   tst(scratch, Operand(0xff000000));
3217   add(zeros, zeros, Operand(8), LeaveCC, eq);
3218   mov(scratch, Operand(scratch, LSL, 8), LeaveCC, eq);
3219   // Top 4.
3220   tst(scratch, Operand(0xf0000000));
3221   add(zeros, zeros, Operand(4), LeaveCC, eq);
3222   mov(scratch, Operand(scratch, LSL, 4), LeaveCC, eq);
3223   // Top 2.
3224   tst(scratch, Operand(0xc0000000));
3225   add(zeros, zeros, Operand(2), LeaveCC, eq);
3226   mov(scratch, Operand(scratch, LSL, 2), LeaveCC, eq);
3227   // Top bit.
3228   tst(scratch, Operand(0x80000000u));
3229   add(zeros, zeros, Operand(1), LeaveCC, eq);
3230 #endif
3231 }
3232 
3233 
JumpIfBothInstanceTypesAreNotSequentialAscii(Register first,Register second,Register scratch1,Register scratch2,Label * failure)3234 void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialAscii(
3235     Register first,
3236     Register second,
3237     Register scratch1,
3238     Register scratch2,
3239     Label* failure) {
3240   int kFlatAsciiStringMask =
3241       kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
3242   int kFlatAsciiStringTag = ASCII_STRING_TYPE;
3243   and_(scratch1, first, Operand(kFlatAsciiStringMask));
3244   and_(scratch2, second, Operand(kFlatAsciiStringMask));
3245   cmp(scratch1, Operand(kFlatAsciiStringTag));
3246   // Ignore second test if first test failed.
3247   cmp(scratch2, Operand(kFlatAsciiStringTag), eq);
3248   b(ne, failure);
3249 }
3250 
3251 
JumpIfInstanceTypeIsNotSequentialAscii(Register type,Register scratch,Label * failure)3252 void MacroAssembler::JumpIfInstanceTypeIsNotSequentialAscii(Register type,
3253                                                             Register scratch,
3254                                                             Label* failure) {
3255   int kFlatAsciiStringMask =
3256       kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
3257   int kFlatAsciiStringTag = ASCII_STRING_TYPE;
3258   and_(scratch, type, Operand(kFlatAsciiStringMask));
3259   cmp(scratch, Operand(kFlatAsciiStringTag));
3260   b(ne, failure);
3261 }
3262 
3263 static const int kRegisterPassedArguments = 4;
3264 
3265 
CalculateStackPassedWords(int num_reg_arguments,int num_double_arguments)3266 int MacroAssembler::CalculateStackPassedWords(int num_reg_arguments,
3267                                               int num_double_arguments) {
3268   int stack_passed_words = 0;
3269   if (use_eabi_hardfloat()) {
3270     // In the hard floating point calling convention, we can use
3271     // all double registers to pass doubles.
3272     if (num_double_arguments > DoubleRegister::kNumRegisters) {
3273       stack_passed_words +=
3274           2 * (num_double_arguments - DoubleRegister::kNumRegisters);
3275     }
3276   } else {
3277     // In the soft floating point calling convention, every double
3278     // argument is passed using two registers.
3279     num_reg_arguments += 2 * num_double_arguments;
3280   }
3281   // Up to four simple arguments are passed in registers r0..r3.
3282   if (num_reg_arguments > kRegisterPassedArguments) {
3283     stack_passed_words += num_reg_arguments - kRegisterPassedArguments;
3284   }
3285   return stack_passed_words;
3286 }
3287 
3288 
PrepareCallCFunction(int num_reg_arguments,int num_double_arguments,Register scratch)3289 void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
3290                                           int num_double_arguments,
3291                                           Register scratch) {
3292   int frame_alignment = ActivationFrameAlignment();
3293   int stack_passed_arguments = CalculateStackPassedWords(
3294       num_reg_arguments, num_double_arguments);
3295   if (frame_alignment > kPointerSize) {
3296     // Make stack end at alignment and make room for num_arguments - 4 words
3297     // and the original value of sp.
3298     mov(scratch, sp);
3299     sub(sp, sp, Operand((stack_passed_arguments + 1) * kPointerSize));
3300     ASSERT(IsPowerOf2(frame_alignment));
3301     and_(sp, sp, Operand(-frame_alignment));
3302     str(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
3303   } else {
3304     sub(sp, sp, Operand(stack_passed_arguments * kPointerSize));
3305   }
3306 }
3307 
3308 
PrepareCallCFunction(int num_reg_arguments,Register scratch)3309 void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
3310                                           Register scratch) {
3311   PrepareCallCFunction(num_reg_arguments, 0, scratch);
3312 }
3313 
3314 
SetCallCDoubleArguments(DoubleRegister dreg)3315 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg) {
3316   if (use_eabi_hardfloat()) {
3317     Move(d0, dreg);
3318   } else {
3319     vmov(r0, r1, dreg);
3320   }
3321 }
3322 
3323 
SetCallCDoubleArguments(DoubleRegister dreg1,DoubleRegister dreg2)3324 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg1,
3325                                              DoubleRegister dreg2) {
3326   if (use_eabi_hardfloat()) {
3327     if (dreg2.is(d0)) {
3328       ASSERT(!dreg1.is(d1));
3329       Move(d1, dreg2);
3330       Move(d0, dreg1);
3331     } else {
3332       Move(d0, dreg1);
3333       Move(d1, dreg2);
3334     }
3335   } else {
3336     vmov(r0, r1, dreg1);
3337     vmov(r2, r3, dreg2);
3338   }
3339 }
3340 
3341 
SetCallCDoubleArguments(DoubleRegister dreg,Register reg)3342 void MacroAssembler::SetCallCDoubleArguments(DoubleRegister dreg,
3343                                              Register reg) {
3344   if (use_eabi_hardfloat()) {
3345     Move(d0, dreg);
3346     Move(r0, reg);
3347   } else {
3348     Move(r2, reg);
3349     vmov(r0, r1, dreg);
3350   }
3351 }
3352 
3353 
CallCFunction(ExternalReference function,int num_reg_arguments,int num_double_arguments)3354 void MacroAssembler::CallCFunction(ExternalReference function,
3355                                    int num_reg_arguments,
3356                                    int num_double_arguments) {
3357   mov(ip, Operand(function));
3358   CallCFunctionHelper(ip, num_reg_arguments, num_double_arguments);
3359 }
3360 
3361 
CallCFunction(Register function,int num_reg_arguments,int num_double_arguments)3362 void MacroAssembler::CallCFunction(Register function,
3363                                    int num_reg_arguments,
3364                                    int num_double_arguments) {
3365   CallCFunctionHelper(function, num_reg_arguments, num_double_arguments);
3366 }
3367 
3368 
CallCFunction(ExternalReference function,int num_arguments)3369 void MacroAssembler::CallCFunction(ExternalReference function,
3370                                    int num_arguments) {
3371   CallCFunction(function, num_arguments, 0);
3372 }
3373 
3374 
CallCFunction(Register function,int num_arguments)3375 void MacroAssembler::CallCFunction(Register function,
3376                                    int num_arguments) {
3377   CallCFunction(function, num_arguments, 0);
3378 }
3379 
3380 
CallCFunctionHelper(Register function,int num_reg_arguments,int num_double_arguments)3381 void MacroAssembler::CallCFunctionHelper(Register function,
3382                                          int num_reg_arguments,
3383                                          int num_double_arguments) {
3384   ASSERT(has_frame());
3385   // Make sure that the stack is aligned before calling a C function unless
3386   // running in the simulator. The simulator has its own alignment check which
3387   // provides more information.
3388 #if defined(V8_HOST_ARCH_ARM)
3389   if (emit_debug_code()) {
3390     int frame_alignment = OS::ActivationFrameAlignment();
3391     int frame_alignment_mask = frame_alignment - 1;
3392     if (frame_alignment > kPointerSize) {
3393       ASSERT(IsPowerOf2(frame_alignment));
3394       Label alignment_as_expected;
3395       tst(sp, Operand(frame_alignment_mask));
3396       b(eq, &alignment_as_expected);
3397       // Don't use Check here, as it will call Runtime_Abort possibly
3398       // re-entering here.
3399       stop("Unexpected alignment");
3400       bind(&alignment_as_expected);
3401     }
3402   }
3403 #endif
3404 
3405   // Just call directly. The function called cannot cause a GC, or
3406   // allow preemption, so the return address in the link register
3407   // stays correct.
3408   Call(function);
3409   int stack_passed_arguments = CalculateStackPassedWords(
3410       num_reg_arguments, num_double_arguments);
3411   if (ActivationFrameAlignment() > kPointerSize) {
3412     ldr(sp, MemOperand(sp, stack_passed_arguments * kPointerSize));
3413   } else {
3414     add(sp, sp, Operand(stack_passed_arguments * sizeof(kPointerSize)));
3415   }
3416 }
3417 
3418 
GetRelocatedValueLocation(Register ldr_location,Register result)3419 void MacroAssembler::GetRelocatedValueLocation(Register ldr_location,
3420                                Register result) {
3421   const uint32_t kLdrOffsetMask = (1 << 12) - 1;
3422   const int32_t kPCRegOffset = 2 * kPointerSize;
3423   ldr(result, MemOperand(ldr_location));
3424   if (emit_debug_code()) {
3425     // Check that the instruction is a ldr reg, [pc + offset] .
3426     and_(result, result, Operand(kLdrPCPattern));
3427     cmp(result, Operand(kLdrPCPattern));
3428     Check(eq, "The instruction to patch should be a load from pc.");
3429     // Result was clobbered. Restore it.
3430     ldr(result, MemOperand(ldr_location));
3431   }
3432   // Get the address of the constant.
3433   and_(result, result, Operand(kLdrOffsetMask));
3434   add(result, ldr_location, Operand(result));
3435   add(result, result, Operand(kPCRegOffset));
3436 }
3437 
3438 
CheckPageFlag(Register object,Register scratch,int mask,Condition cc,Label * condition_met)3439 void MacroAssembler::CheckPageFlag(
3440     Register object,
3441     Register scratch,
3442     int mask,
3443     Condition cc,
3444     Label* condition_met) {
3445   and_(scratch, object, Operand(~Page::kPageAlignmentMask));
3446   ldr(scratch, MemOperand(scratch, MemoryChunk::kFlagsOffset));
3447   tst(scratch, Operand(mask));
3448   b(cc, condition_met);
3449 }
3450 
3451 
JumpIfBlack(Register object,Register scratch0,Register scratch1,Label * on_black)3452 void MacroAssembler::JumpIfBlack(Register object,
3453                                  Register scratch0,
3454                                  Register scratch1,
3455                                  Label* on_black) {
3456   HasColor(object, scratch0, scratch1, on_black, 1, 0);  // kBlackBitPattern.
3457   ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
3458 }
3459 
3460 
HasColor(Register object,Register bitmap_scratch,Register mask_scratch,Label * has_color,int first_bit,int second_bit)3461 void MacroAssembler::HasColor(Register object,
3462                               Register bitmap_scratch,
3463                               Register mask_scratch,
3464                               Label* has_color,
3465                               int first_bit,
3466                               int second_bit) {
3467   ASSERT(!AreAliased(object, bitmap_scratch, mask_scratch, no_reg));
3468 
3469   GetMarkBits(object, bitmap_scratch, mask_scratch);
3470 
3471   Label other_color, word_boundary;
3472   ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
3473   tst(ip, Operand(mask_scratch));
3474   b(first_bit == 1 ? eq : ne, &other_color);
3475   // Shift left 1 by adding.
3476   add(mask_scratch, mask_scratch, Operand(mask_scratch), SetCC);
3477   b(eq, &word_boundary);
3478   tst(ip, Operand(mask_scratch));
3479   b(second_bit == 1 ? ne : eq, has_color);
3480   jmp(&other_color);
3481 
3482   bind(&word_boundary);
3483   ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize + kPointerSize));
3484   tst(ip, Operand(1));
3485   b(second_bit == 1 ? ne : eq, has_color);
3486   bind(&other_color);
3487 }
3488 
3489 
3490 // Detect some, but not all, common pointer-free objects.  This is used by the
3491 // incremental write barrier which doesn't care about oddballs (they are always
3492 // marked black immediately so this code is not hit).
JumpIfDataObject(Register value,Register scratch,Label * not_data_object)3493 void MacroAssembler::JumpIfDataObject(Register value,
3494                                       Register scratch,
3495                                       Label* not_data_object) {
3496   Label is_data_object;
3497   ldr(scratch, FieldMemOperand(value, HeapObject::kMapOffset));
3498   CompareRoot(scratch, Heap::kHeapNumberMapRootIndex);
3499   b(eq, &is_data_object);
3500   ASSERT(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1);
3501   ASSERT(kNotStringTag == 0x80 && kIsNotStringMask == 0x80);
3502   // If it's a string and it's not a cons string then it's an object containing
3503   // no GC pointers.
3504   ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
3505   tst(scratch, Operand(kIsIndirectStringMask | kIsNotStringMask));
3506   b(ne, not_data_object);
3507   bind(&is_data_object);
3508 }
3509 
3510 
GetMarkBits(Register addr_reg,Register bitmap_reg,Register mask_reg)3511 void MacroAssembler::GetMarkBits(Register addr_reg,
3512                                  Register bitmap_reg,
3513                                  Register mask_reg) {
3514   ASSERT(!AreAliased(addr_reg, bitmap_reg, mask_reg, no_reg));
3515   and_(bitmap_reg, addr_reg, Operand(~Page::kPageAlignmentMask));
3516   Ubfx(mask_reg, addr_reg, kPointerSizeLog2, Bitmap::kBitsPerCellLog2);
3517   const int kLowBits = kPointerSizeLog2 + Bitmap::kBitsPerCellLog2;
3518   Ubfx(ip, addr_reg, kLowBits, kPageSizeBits - kLowBits);
3519   add(bitmap_reg, bitmap_reg, Operand(ip, LSL, kPointerSizeLog2));
3520   mov(ip, Operand(1));
3521   mov(mask_reg, Operand(ip, LSL, mask_reg));
3522 }
3523 
3524 
EnsureNotWhite(Register value,Register bitmap_scratch,Register mask_scratch,Register load_scratch,Label * value_is_white_and_not_data)3525 void MacroAssembler::EnsureNotWhite(
3526     Register value,
3527     Register bitmap_scratch,
3528     Register mask_scratch,
3529     Register load_scratch,
3530     Label* value_is_white_and_not_data) {
3531   ASSERT(!AreAliased(value, bitmap_scratch, mask_scratch, ip));
3532   GetMarkBits(value, bitmap_scratch, mask_scratch);
3533 
3534   // If the value is black or grey we don't need to do anything.
3535   ASSERT(strcmp(Marking::kWhiteBitPattern, "00") == 0);
3536   ASSERT(strcmp(Marking::kBlackBitPattern, "10") == 0);
3537   ASSERT(strcmp(Marking::kGreyBitPattern, "11") == 0);
3538   ASSERT(strcmp(Marking::kImpossibleBitPattern, "01") == 0);
3539 
3540   Label done;
3541 
3542   // Since both black and grey have a 1 in the first position and white does
3543   // not have a 1 there we only need to check one bit.
3544   ldr(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
3545   tst(mask_scratch, load_scratch);
3546   b(ne, &done);
3547 
3548   if (emit_debug_code()) {
3549     // Check for impossible bit pattern.
3550     Label ok;
3551     // LSL may overflow, making the check conservative.
3552     tst(load_scratch, Operand(mask_scratch, LSL, 1));
3553     b(eq, &ok);
3554     stop("Impossible marking bit pattern");
3555     bind(&ok);
3556   }
3557 
3558   // Value is white.  We check whether it is data that doesn't need scanning.
3559   // Currently only checks for HeapNumber and non-cons strings.
3560   Register map = load_scratch;  // Holds map while checking type.
3561   Register length = load_scratch;  // Holds length of object after testing type.
3562   Label is_data_object;
3563 
3564   // Check for heap-number
3565   ldr(map, FieldMemOperand(value, HeapObject::kMapOffset));
3566   CompareRoot(map, Heap::kHeapNumberMapRootIndex);
3567   mov(length, Operand(HeapNumber::kSize), LeaveCC, eq);
3568   b(eq, &is_data_object);
3569 
3570   // Check for strings.
3571   ASSERT(kIsIndirectStringTag == 1 && kIsIndirectStringMask == 1);
3572   ASSERT(kNotStringTag == 0x80 && kIsNotStringMask == 0x80);
3573   // If it's a string and it's not a cons string then it's an object containing
3574   // no GC pointers.
3575   Register instance_type = load_scratch;
3576   ldrb(instance_type, FieldMemOperand(map, Map::kInstanceTypeOffset));
3577   tst(instance_type, Operand(kIsIndirectStringMask | kIsNotStringMask));
3578   b(ne, value_is_white_and_not_data);
3579   // It's a non-indirect (non-cons and non-slice) string.
3580   // If it's external, the length is just ExternalString::kSize.
3581   // Otherwise it's String::kHeaderSize + string->length() * (1 or 2).
3582   // External strings are the only ones with the kExternalStringTag bit
3583   // set.
3584   ASSERT_EQ(0, kSeqStringTag & kExternalStringTag);
3585   ASSERT_EQ(0, kConsStringTag & kExternalStringTag);
3586   tst(instance_type, Operand(kExternalStringTag));
3587   mov(length, Operand(ExternalString::kSize), LeaveCC, ne);
3588   b(ne, &is_data_object);
3589 
3590   // Sequential string, either ASCII or UC16.
3591   // For ASCII (char-size of 1) we shift the smi tag away to get the length.
3592   // For UC16 (char-size of 2) we just leave the smi tag in place, thereby
3593   // getting the length multiplied by 2.
3594   ASSERT(kAsciiStringTag == 4 && kStringEncodingMask == 4);
3595   ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
3596   ldr(ip, FieldMemOperand(value, String::kLengthOffset));
3597   tst(instance_type, Operand(kStringEncodingMask));
3598   mov(ip, Operand(ip, LSR, 1), LeaveCC, ne);
3599   add(length, ip, Operand(SeqString::kHeaderSize + kObjectAlignmentMask));
3600   and_(length, length, Operand(~kObjectAlignmentMask));
3601 
3602   bind(&is_data_object);
3603   // Value is a data object, and it is white.  Mark it black.  Since we know
3604   // that the object is white we can make it black by flipping one bit.
3605   ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
3606   orr(ip, ip, Operand(mask_scratch));
3607   str(ip, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
3608 
3609   and_(bitmap_scratch, bitmap_scratch, Operand(~Page::kPageAlignmentMask));
3610   ldr(ip, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
3611   add(ip, ip, Operand(length));
3612   str(ip, MemOperand(bitmap_scratch, MemoryChunk::kLiveBytesOffset));
3613 
3614   bind(&done);
3615 }
3616 
3617 
ClampUint8(Register output_reg,Register input_reg)3618 void MacroAssembler::ClampUint8(Register output_reg, Register input_reg) {
3619   Usat(output_reg, 8, Operand(input_reg));
3620 }
3621 
3622 
ClampDoubleToUint8(Register result_reg,DoubleRegister input_reg,DoubleRegister temp_double_reg)3623 void MacroAssembler::ClampDoubleToUint8(Register result_reg,
3624                                         DoubleRegister input_reg,
3625                                         DoubleRegister temp_double_reg) {
3626   Label above_zero;
3627   Label done;
3628   Label in_bounds;
3629 
3630   Vmov(temp_double_reg, 0.0);
3631   VFPCompareAndSetFlags(input_reg, temp_double_reg);
3632   b(gt, &above_zero);
3633 
3634   // Double value is less than zero, NaN or Inf, return 0.
3635   mov(result_reg, Operand(0));
3636   b(al, &done);
3637 
3638   // Double value is >= 255, return 255.
3639   bind(&above_zero);
3640   Vmov(temp_double_reg, 255.0);
3641   VFPCompareAndSetFlags(input_reg, temp_double_reg);
3642   b(le, &in_bounds);
3643   mov(result_reg, Operand(255));
3644   b(al, &done);
3645 
3646   // In 0-255 range, round and truncate.
3647   bind(&in_bounds);
3648   Vmov(temp_double_reg, 0.5);
3649   vadd(temp_double_reg, input_reg, temp_double_reg);
3650   vcvt_u32_f64(temp_double_reg.low(), temp_double_reg);
3651   vmov(result_reg, temp_double_reg.low());
3652   bind(&done);
3653 }
3654 
3655 
LoadInstanceDescriptors(Register map,Register descriptors)3656 void MacroAssembler::LoadInstanceDescriptors(Register map,
3657                                              Register descriptors) {
3658   ldr(descriptors,
3659       FieldMemOperand(map, Map::kInstanceDescriptorsOrBitField3Offset));
3660   Label not_smi;
3661   JumpIfNotSmi(descriptors, &not_smi);
3662   mov(descriptors, Operand(FACTORY->empty_descriptor_array()));
3663   bind(&not_smi);
3664 }
3665 
3666 
CheckEnumCache(Register null_value,Label * call_runtime)3667 void MacroAssembler::CheckEnumCache(Register null_value, Label* call_runtime) {
3668   Label next;
3669   // Preload a couple of values used in the loop.
3670   Register  empty_fixed_array_value = r6;
3671   LoadRoot(empty_fixed_array_value, Heap::kEmptyFixedArrayRootIndex);
3672   Register empty_descriptor_array_value = r7;
3673   LoadRoot(empty_descriptor_array_value,
3674            Heap::kEmptyDescriptorArrayRootIndex);
3675   mov(r1, r0);
3676   bind(&next);
3677 
3678   // Check that there are no elements.  Register r1 contains the
3679   // current JS object we've reached through the prototype chain.
3680   ldr(r2, FieldMemOperand(r1, JSObject::kElementsOffset));
3681   cmp(r2, empty_fixed_array_value);
3682   b(ne, call_runtime);
3683 
3684   // Check that instance descriptors are not empty so that we can
3685   // check for an enum cache.  Leave the map in r2 for the subsequent
3686   // prototype load.
3687   ldr(r2, FieldMemOperand(r1, HeapObject::kMapOffset));
3688   ldr(r3, FieldMemOperand(r2, Map::kInstanceDescriptorsOrBitField3Offset));
3689   JumpIfSmi(r3, call_runtime);
3690 
3691   // Check that there is an enum cache in the non-empty instance
3692   // descriptors (r3).  This is the case if the next enumeration
3693   // index field does not contain a smi.
3694   ldr(r3, FieldMemOperand(r3, DescriptorArray::kEnumerationIndexOffset));
3695   JumpIfSmi(r3, call_runtime);
3696 
3697   // For all objects but the receiver, check that the cache is empty.
3698   Label check_prototype;
3699   cmp(r1, r0);
3700   b(eq, &check_prototype);
3701   ldr(r3, FieldMemOperand(r3, DescriptorArray::kEnumCacheBridgeCacheOffset));
3702   cmp(r3, empty_fixed_array_value);
3703   b(ne, call_runtime);
3704 
3705   // Load the prototype from the map and loop if non-null.
3706   bind(&check_prototype);
3707   ldr(r1, FieldMemOperand(r2, Map::kPrototypeOffset));
3708   cmp(r1, null_value);
3709   b(ne, &next);
3710 }
3711 
3712 
AreAliased(Register r1,Register r2,Register r3,Register r4)3713 bool AreAliased(Register r1, Register r2, Register r3, Register r4) {
3714   if (r1.is(r2)) return true;
3715   if (r1.is(r3)) return true;
3716   if (r1.is(r4)) return true;
3717   if (r2.is(r3)) return true;
3718   if (r2.is(r4)) return true;
3719   if (r3.is(r4)) return true;
3720   return false;
3721 }
3722 
3723 
CodePatcher(byte * address,int instructions)3724 CodePatcher::CodePatcher(byte* address, int instructions)
3725     : address_(address),
3726       instructions_(instructions),
3727       size_(instructions * Assembler::kInstrSize),
3728       masm_(Isolate::Current(), address, size_ + Assembler::kGap) {
3729   // Create a new macro assembler pointing to the address of the code to patch.
3730   // The size is adjusted with kGap on order for the assembler to generate size
3731   // bytes of instructions without failing with buffer size constraints.
3732   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
3733 }
3734 
3735 
~CodePatcher()3736 CodePatcher::~CodePatcher() {
3737   // Indicate that code has changed.
3738   CPU::FlushICache(address_, size_);
3739 
3740   // Check that the code was patched as expected.
3741   ASSERT(masm_.pc_ == address_ + size_);
3742   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
3743 }
3744 
3745 
Emit(Instr instr)3746 void CodePatcher::Emit(Instr instr) {
3747   masm()->emit(instr);
3748 }
3749 
3750 
Emit(Address addr)3751 void CodePatcher::Emit(Address addr) {
3752   masm()->emit(reinterpret_cast<Instr>(addr));
3753 }
3754 
3755 
EmitCondition(Condition cond)3756 void CodePatcher::EmitCondition(Condition cond) {
3757   Instr instr = Assembler::instr_at(masm_.pc_);
3758   instr = (instr & ~kCondMask) | cond;
3759   masm_.emit(instr);
3760 }
3761 
3762 
3763 } }  // namespace v8::internal
3764 
3765 #endif  // V8_TARGET_ARCH_ARM
3766