1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_
6 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_
7
8 #include "src/assembler.h"
9 #include "src/bailout-reason.h"
10 #include "src/frames.h"
11 #include "src/globals.h"
12
13 namespace v8 {
14 namespace internal {
15
16 // Give alias names to registers for calling conventions.
17 const Register kReturnRegister0 = {Register::kCode_eax};
18 const Register kReturnRegister1 = {Register::kCode_edx};
19 const Register kReturnRegister2 = {Register::kCode_edi};
20 const Register kJSFunctionRegister = {Register::kCode_edi};
21 const Register kContextRegister = {Register::kCode_esi};
22 const Register kAllocateSizeRegister = {Register::kCode_edx};
23 const Register kInterpreterAccumulatorRegister = {Register::kCode_eax};
24 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx};
25 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi};
26 const Register kInterpreterDispatchTableRegister = {Register::kCode_esi};
27 const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax};
28 const Register kJavaScriptCallNewTargetRegister = {Register::kCode_edx};
29 const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx};
30 const Register kRuntimeCallArgCountRegister = {Register::kCode_eax};
31
32 // Convenience for platform-independent signatures. We do not normally
33 // distinguish memory operands from other operands on ia32.
34 typedef Operand MemOperand;
35
36 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
37 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
38 enum PointersToHereCheck {
39 kPointersToHereMaybeInteresting,
40 kPointersToHereAreAlwaysInteresting
41 };
42
43 enum RegisterValueType { REGISTER_VALUE_IS_SMI, REGISTER_VALUE_IS_INT32 };
44
45 enum class ReturnAddressState { kOnStack, kNotOnStack };
46
47 #ifdef DEBUG
48 bool AreAliased(Register reg1, Register reg2, Register reg3 = no_reg,
49 Register reg4 = no_reg, Register reg5 = no_reg,
50 Register reg6 = no_reg, Register reg7 = no_reg,
51 Register reg8 = no_reg);
52 #endif
53
54 // MacroAssembler implements a collection of frequently used macros.
55 class MacroAssembler: public Assembler {
56 public:
57 MacroAssembler(Isolate* isolate, void* buffer, int size,
58 CodeObjectRequired create_code_object);
59
60 void Load(Register dst, const Operand& src, Representation r);
61 void Store(Register src, const Operand& dst, Representation r);
62
63 // Load a register with a long value as efficiently as possible.
Set(Register dst,int32_t x)64 void Set(Register dst, int32_t x) {
65 if (x == 0) {
66 xor_(dst, dst);
67 } else {
68 mov(dst, Immediate(x));
69 }
70 }
Set(const Operand & dst,int32_t x)71 void Set(const Operand& dst, int32_t x) { mov(dst, Immediate(x)); }
72
73 // Operations on roots in the root-array.
74 void LoadRoot(Register destination, Heap::RootListIndex index);
75 void StoreRoot(Register source, Register scratch, Heap::RootListIndex index);
76 void CompareRoot(Register with, Register scratch, Heap::RootListIndex index);
77 // These methods can only be used with constant roots (i.e. non-writable
78 // and not in new space).
79 void CompareRoot(Register with, Heap::RootListIndex index);
80 void CompareRoot(const Operand& with, Heap::RootListIndex index);
81 void PushRoot(Heap::RootListIndex index);
82
83 // Compare the object in a register to a value and jump if they are equal.
84 void JumpIfRoot(Register with, Heap::RootListIndex index, Label* if_equal,
85 Label::Distance if_equal_distance = Label::kFar) {
86 CompareRoot(with, index);
87 j(equal, if_equal, if_equal_distance);
88 }
89 void JumpIfRoot(const Operand& with, Heap::RootListIndex index,
90 Label* if_equal,
91 Label::Distance if_equal_distance = Label::kFar) {
92 CompareRoot(with, index);
93 j(equal, if_equal, if_equal_distance);
94 }
95
96 // Compare the object in a register to a value and jump if they are not equal.
97 void JumpIfNotRoot(Register with, Heap::RootListIndex index,
98 Label* if_not_equal,
99 Label::Distance if_not_equal_distance = Label::kFar) {
100 CompareRoot(with, index);
101 j(not_equal, if_not_equal, if_not_equal_distance);
102 }
103 void JumpIfNotRoot(const Operand& with, Heap::RootListIndex index,
104 Label* if_not_equal,
105 Label::Distance if_not_equal_distance = Label::kFar) {
106 CompareRoot(with, index);
107 j(not_equal, if_not_equal, if_not_equal_distance);
108 }
109
110 // These functions do not arrange the registers in any particular order so
111 // they are not useful for calls that can cause a GC. The caller can
112 // exclude up to 3 registers that do not need to be saved and restored.
113 void PushCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1 = no_reg,
114 Register exclusion2 = no_reg,
115 Register exclusion3 = no_reg);
116 void PopCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1 = no_reg,
117 Register exclusion2 = no_reg,
118 Register exclusion3 = no_reg);
119
120 // ---------------------------------------------------------------------------
121 // GC Support
122 enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd };
123
124 // Record in the remembered set the fact that we have a pointer to new space
125 // at the address pointed to by the addr register. Only works if addr is not
126 // in new space.
127 void RememberedSetHelper(Register object, // Used for debug code.
128 Register addr, Register scratch,
129 SaveFPRegsMode save_fp,
130 RememberedSetFinalAction and_then);
131
132 void CheckPageFlag(Register object, Register scratch, int mask, Condition cc,
133 Label* condition_met,
134 Label::Distance condition_met_distance = Label::kFar);
135
136 void CheckPageFlagForMap(
137 Handle<Map> map, int mask, Condition cc, Label* condition_met,
138 Label::Distance condition_met_distance = Label::kFar);
139
140 // Check if object is in new space. Jumps if the object is not in new space.
141 // The register scratch can be object itself, but scratch will be clobbered.
142 void JumpIfNotInNewSpace(Register object, Register scratch, Label* branch,
143 Label::Distance distance = Label::kFar) {
144 InNewSpace(object, scratch, zero, branch, distance);
145 }
146
147 // Check if object is in new space. Jumps if the object is in new space.
148 // The register scratch can be object itself, but it will be clobbered.
149 void JumpIfInNewSpace(Register object, Register scratch, Label* branch,
150 Label::Distance distance = Label::kFar) {
151 InNewSpace(object, scratch, not_zero, branch, distance);
152 }
153
154 // Check if an object has a given incremental marking color. Also uses ecx!
155 void HasColor(Register object, Register scratch0, Register scratch1,
156 Label* has_color, Label::Distance has_color_distance,
157 int first_bit, int second_bit);
158
159 void JumpIfBlack(Register object, Register scratch0, Register scratch1,
160 Label* on_black,
161 Label::Distance on_black_distance = Label::kFar);
162
163 // Checks the color of an object. If the object is white we jump to the
164 // incremental marker.
165 void JumpIfWhite(Register value, Register scratch1, Register scratch2,
166 Label* value_is_white, Label::Distance distance);
167
168 // Notify the garbage collector that we wrote a pointer into an object.
169 // |object| is the object being stored into, |value| is the object being
170 // stored. value and scratch registers are clobbered by the operation.
171 // The offset is the offset from the start of the object, not the offset from
172 // the tagged HeapObject pointer. For use with FieldOperand(reg, off).
173 void RecordWriteField(
174 Register object, int offset, Register value, Register scratch,
175 SaveFPRegsMode save_fp,
176 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
177 SmiCheck smi_check = INLINE_SMI_CHECK,
178 PointersToHereCheck pointers_to_here_check_for_value =
179 kPointersToHereMaybeInteresting);
180
181 // As above, but the offset has the tag presubtracted. For use with
182 // Operand(reg, off).
183 void RecordWriteContextSlot(
184 Register context, int offset, Register value, Register scratch,
185 SaveFPRegsMode save_fp,
186 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
187 SmiCheck smi_check = INLINE_SMI_CHECK,
188 PointersToHereCheck pointers_to_here_check_for_value =
189 kPointersToHereMaybeInteresting) {
190 RecordWriteField(context, offset + kHeapObjectTag, value, scratch, save_fp,
191 remembered_set_action, smi_check,
192 pointers_to_here_check_for_value);
193 }
194
195 // Notify the garbage collector that we wrote a pointer into a fixed array.
196 // |array| is the array being stored into, |value| is the
197 // object being stored. |index| is the array index represented as a
198 // Smi. All registers are clobbered by the operation RecordWriteArray
199 // filters out smis so it does not update the write barrier if the
200 // value is a smi.
201 void RecordWriteArray(
202 Register array, Register value, Register index, SaveFPRegsMode save_fp,
203 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
204 SmiCheck smi_check = INLINE_SMI_CHECK,
205 PointersToHereCheck pointers_to_here_check_for_value =
206 kPointersToHereMaybeInteresting);
207
208 // For page containing |object| mark region covering |address|
209 // dirty. |object| is the object being stored into, |value| is the
210 // object being stored. The address and value registers are clobbered by the
211 // operation. RecordWrite filters out smis so it does not update the
212 // write barrier if the value is a smi.
213 void RecordWrite(
214 Register object, Register address, Register value, SaveFPRegsMode save_fp,
215 RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
216 SmiCheck smi_check = INLINE_SMI_CHECK,
217 PointersToHereCheck pointers_to_here_check_for_value =
218 kPointersToHereMaybeInteresting);
219
220 // Notify the garbage collector that we wrote a code entry into a
221 // JSFunction. Only scratch is clobbered by the operation.
222 void RecordWriteCodeEntryField(Register js_function, Register code_entry,
223 Register scratch);
224
225 // For page containing |object| mark the region covering the object's map
226 // dirty. |object| is the object being stored into, |map| is the Map object
227 // that was stored.
228 void RecordWriteForMap(Register object, Handle<Map> map, Register scratch1,
229 Register scratch2, SaveFPRegsMode save_fp);
230
231 // Frame restart support
232 void MaybeDropFrames();
233
234 // Generates function and stub prologue code.
235 void StubPrologue(StackFrame::Type type);
236 void Prologue(bool code_pre_aging);
237
238 // Enter specific kind of exit frame. Expects the number of
239 // arguments in register eax and sets up the number of arguments in
240 // register edi and the pointer to the first argument in register
241 // esi.
242 void EnterExitFrame(int argc, bool save_doubles, StackFrame::Type frame_type);
243
244 void EnterApiExitFrame(int argc);
245
246 // Leave the current exit frame. Expects the return value in
247 // register eax:edx (untouched) and the pointer to the first
248 // argument in register esi (if pop_arguments == true).
249 void LeaveExitFrame(bool save_doubles, bool pop_arguments = true);
250
251 // Leave the current exit frame. Expects the return value in
252 // register eax (untouched).
253 void LeaveApiExitFrame(bool restore_context);
254
255 // Find the function context up the context chain.
256 void LoadContext(Register dst, int context_chain_length);
257
258 // Load the global proxy from the current context.
259 void LoadGlobalProxy(Register dst);
260
261 // Load the global function with the given index.
262 void LoadGlobalFunction(int index, Register function);
263
264 // Load the initial map from the global function. The registers
265 // function and map can be the same.
266 void LoadGlobalFunctionInitialMap(Register function, Register map);
267
268 // Push and pop the registers that can hold pointers.
PushSafepointRegisters()269 void PushSafepointRegisters() { pushad(); }
PopSafepointRegisters()270 void PopSafepointRegisters() { popad(); }
271 // Store the value in register/immediate src in the safepoint
272 // register stack slot for register dst.
273 void StoreToSafepointRegisterSlot(Register dst, Register src);
274 void StoreToSafepointRegisterSlot(Register dst, Immediate src);
275 void LoadFromSafepointRegisterSlot(Register dst, Register src);
276
277 // Nop, because ia32 does not have a root register.
InitializeRootRegister()278 void InitializeRootRegister() {}
279
280 void LoadHeapObject(Register result, Handle<HeapObject> object);
281 void CmpHeapObject(Register reg, Handle<HeapObject> object);
282 void PushHeapObject(Handle<HeapObject> object);
283
LoadObject(Register result,Handle<Object> object)284 void LoadObject(Register result, Handle<Object> object) {
285 AllowDeferredHandleDereference heap_object_check;
286 if (object->IsHeapObject()) {
287 LoadHeapObject(result, Handle<HeapObject>::cast(object));
288 } else {
289 Move(result, Immediate(object));
290 }
291 }
292
CmpObject(Register reg,Handle<Object> object)293 void CmpObject(Register reg, Handle<Object> object) {
294 AllowDeferredHandleDereference heap_object_check;
295 if (object->IsHeapObject()) {
296 CmpHeapObject(reg, Handle<HeapObject>::cast(object));
297 } else {
298 cmp(reg, Immediate(object));
299 }
300 }
301
302 // Compare the given value and the value of weak cell.
303 void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch);
304
305 void GetWeakValue(Register value, Handle<WeakCell> cell);
306
307 // Load the value of the weak cell in the value register. Branch to the given
308 // miss label if the weak cell was cleared.
309 void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss);
310
311 // ---------------------------------------------------------------------------
312 // JavaScript invokes
313
314 // Removes current frame and its arguments from the stack preserving
315 // the arguments and a return address pushed to the stack for the next call.
316 // |ra_state| defines whether return address is already pushed to stack or
317 // not. Both |callee_args_count| and |caller_args_count_reg| do not include
318 // receiver. |callee_args_count| is not modified, |caller_args_count_reg|
319 // is trashed. |number_of_temp_values_after_return_address| specifies
320 // the number of words pushed to the stack after the return address. This is
321 // to allow "allocation" of scratch registers that this function requires
322 // by saving their values on the stack.
323 void PrepareForTailCall(const ParameterCount& callee_args_count,
324 Register caller_args_count_reg, Register scratch0,
325 Register scratch1, ReturnAddressState ra_state,
326 int number_of_temp_values_after_return_address);
327
328 // Invoke the JavaScript function code by either calling or jumping.
329
330 void InvokeFunctionCode(Register function, Register new_target,
331 const ParameterCount& expected,
332 const ParameterCount& actual, InvokeFlag flag,
333 const CallWrapper& call_wrapper);
334
335 // On function call, call into the debugger if necessary.
336 void CheckDebugHook(Register fun, Register new_target,
337 const ParameterCount& expected,
338 const ParameterCount& actual);
339
340 // Invoke the JavaScript function in the given register. Changes the
341 // current context to the context in the function before invoking.
342 void InvokeFunction(Register function, Register new_target,
343 const ParameterCount& actual, InvokeFlag flag,
344 const CallWrapper& call_wrapper);
345
346 void InvokeFunction(Register function, const ParameterCount& expected,
347 const ParameterCount& actual, InvokeFlag flag,
348 const CallWrapper& call_wrapper);
349
350 void InvokeFunction(Handle<JSFunction> function,
351 const ParameterCount& expected,
352 const ParameterCount& actual, InvokeFlag flag,
353 const CallWrapper& call_wrapper);
354
355 // Expression support
356 // cvtsi2sd instruction only writes to the low 64-bit of dst register, which
357 // hinders register renaming and makes dependence chains longer. So we use
358 // xorps to clear the dst register before cvtsi2sd to solve this issue.
Cvtsi2sd(XMMRegister dst,Register src)359 void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); }
360 void Cvtsi2sd(XMMRegister dst, const Operand& src);
361
362 void Cvtui2ss(XMMRegister dst, Register src, Register tmp);
363
364 void ShlPair(Register high, Register low, uint8_t imm8);
365 void ShlPair_cl(Register high, Register low);
366 void ShrPair(Register high, Register low, uint8_t imm8);
367 void ShrPair_cl(Register high, Register src);
368 void SarPair(Register high, Register low, uint8_t imm8);
369 void SarPair_cl(Register high, Register low);
370
371 // Support for constant splitting.
372 bool IsUnsafeImmediate(const Immediate& x);
373 void SafeMove(Register dst, const Immediate& x);
374 void SafePush(const Immediate& x);
375
376 // Compare object type for heap object.
377 // Incoming register is heap_object and outgoing register is map.
378 void CmpObjectType(Register heap_object, InstanceType type, Register map);
379
380 // Compare instance type for map.
381 void CmpInstanceType(Register map, InstanceType type);
382
383 // Compare an object's map with the specified map.
384 void CompareMap(Register obj, Handle<Map> map);
385
386 // Check if the map of an object is equal to a specified map and branch to
387 // label if not. Skip the smi check if not required (object is known to be a
388 // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
389 // against maps that are ElementsKind transition maps of the specified map.
390 void CheckMap(Register obj, Handle<Map> map, Label* fail,
391 SmiCheckType smi_check_type);
392
393 // Check if the map of an object is equal to a specified weak map and branch
394 // to a specified target if equal. Skip the smi check if not required
395 // (object is known to be a heap object)
396 void DispatchWeakMap(Register obj, Register scratch1, Register scratch2,
397 Handle<WeakCell> cell, Handle<Code> success,
398 SmiCheckType smi_check_type);
399
400 // Check if the object in register heap_object is a string. Afterwards the
401 // register map contains the object map and the register instance_type
402 // contains the instance_type. The registers map and instance_type can be the
403 // same in which case it contains the instance type afterwards. Either of the
404 // registers map and instance_type can be the same as heap_object.
405 Condition IsObjectStringType(Register heap_object, Register map,
406 Register instance_type);
407
408 // Check if the object in register heap_object is a name. Afterwards the
409 // register map contains the object map and the register instance_type
410 // contains the instance_type. The registers map and instance_type can be the
411 // same in which case it contains the instance type afterwards. Either of the
412 // registers map and instance_type can be the same as heap_object.
413 Condition IsObjectNameType(Register heap_object, Register map,
414 Register instance_type);
415
416 // FCmp is similar to integer cmp, but requires unsigned
417 // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
418 void FCmp();
419
420 void ClampUint8(Register reg);
421
422 void ClampDoubleToUint8(XMMRegister input_reg, XMMRegister scratch_reg,
423 Register result_reg);
424
425 void SlowTruncateToI(Register result_reg, Register input_reg,
426 int offset = HeapNumber::kValueOffset - kHeapObjectTag);
427
428 void TruncateHeapNumberToI(Register result_reg, Register input_reg);
429 void TruncateDoubleToI(Register result_reg, XMMRegister input_reg);
430
431 void DoubleToI(Register result_reg, XMMRegister input_reg,
432 XMMRegister scratch, MinusZeroMode minus_zero_mode,
433 Label* lost_precision, Label* is_nan, Label* minus_zero,
434 Label::Distance dst = Label::kFar);
435
436 // Smi tagging support.
SmiTag(Register reg)437 void SmiTag(Register reg) {
438 STATIC_ASSERT(kSmiTag == 0);
439 STATIC_ASSERT(kSmiTagSize == 1);
440 add(reg, reg);
441 }
SmiUntag(Register reg)442 void SmiUntag(Register reg) {
443 sar(reg, kSmiTagSize);
444 }
445
446 // Modifies the register even if it does not contain a Smi!
SmiUntag(Register reg,Label * is_smi)447 void SmiUntag(Register reg, Label* is_smi) {
448 STATIC_ASSERT(kSmiTagSize == 1);
449 sar(reg, kSmiTagSize);
450 STATIC_ASSERT(kSmiTag == 0);
451 j(not_carry, is_smi);
452 }
453
LoadUint32(XMMRegister dst,Register src)454 void LoadUint32(XMMRegister dst, Register src) {
455 LoadUint32(dst, Operand(src));
456 }
457 void LoadUint32(XMMRegister dst, const Operand& src);
458
459 // Jump the register contains a smi.
460 inline void JumpIfSmi(Register value, Label* smi_label,
461 Label::Distance distance = Label::kFar) {
462 test(value, Immediate(kSmiTagMask));
463 j(zero, smi_label, distance);
464 }
465 // Jump if the operand is a smi.
466 inline void JumpIfSmi(Operand value, Label* smi_label,
467 Label::Distance distance = Label::kFar) {
468 test(value, Immediate(kSmiTagMask));
469 j(zero, smi_label, distance);
470 }
471 // Jump if register contain a non-smi.
472 inline void JumpIfNotSmi(Register value, Label* not_smi_label,
473 Label::Distance distance = Label::kFar) {
474 test(value, Immediate(kSmiTagMask));
475 j(not_zero, not_smi_label, distance);
476 }
477 // Jump if the operand is not a smi.
478 inline void JumpIfNotSmi(Operand value, Label* smi_label,
479 Label::Distance distance = Label::kFar) {
480 test(value, Immediate(kSmiTagMask));
481 j(not_zero, smi_label, distance);
482 }
483 // Jump if the value cannot be represented by a smi.
484 inline void JumpIfNotValidSmiValue(Register value, Register scratch,
485 Label* on_invalid,
486 Label::Distance distance = Label::kFar) {
487 mov(scratch, value);
488 add(scratch, Immediate(0x40000000U));
489 j(sign, on_invalid, distance);
490 }
491
492 // Jump if the unsigned integer value cannot be represented by a smi.
493 inline void JumpIfUIntNotValidSmiValue(
494 Register value, Label* on_invalid,
495 Label::Distance distance = Label::kFar) {
496 cmp(value, Immediate(0x40000000U));
497 j(above_equal, on_invalid, distance);
498 }
499
500 void LoadInstanceDescriptors(Register map, Register descriptors);
501 void EnumLength(Register dst, Register map);
502 void NumberOfOwnDescriptors(Register dst, Register map);
503 void LoadAccessor(Register dst, Register holder, int accessor_index,
504 AccessorComponent accessor);
505
506 template<typename Field>
DecodeField(Register reg)507 void DecodeField(Register reg) {
508 static const int shift = Field::kShift;
509 static const int mask = Field::kMask >> Field::kShift;
510 if (shift != 0) {
511 sar(reg, shift);
512 }
513 and_(reg, Immediate(mask));
514 }
515
516 template<typename Field>
DecodeFieldToSmi(Register reg)517 void DecodeFieldToSmi(Register reg) {
518 static const int shift = Field::kShift;
519 static const int mask = (Field::kMask >> Field::kShift) << kSmiTagSize;
520 STATIC_ASSERT((mask & (0x80000000u >> (kSmiTagSize - 1))) == 0);
521 STATIC_ASSERT(kSmiTag == 0);
522 if (shift < kSmiTagSize) {
523 shl(reg, kSmiTagSize - shift);
524 } else if (shift > kSmiTagSize) {
525 sar(reg, shift - kSmiTagSize);
526 }
527 and_(reg, Immediate(mask));
528 }
529
530 void LoadPowerOf2(XMMRegister dst, Register scratch, int power);
531
532 // Abort execution if argument is not a number, enabled via --debug-code.
533 void AssertNumber(Register object);
534 void AssertNotNumber(Register object);
535
536 // Abort execution if argument is not a smi, enabled via --debug-code.
537 void AssertSmi(Register object);
538
539 // Abort execution if argument is a smi, enabled via --debug-code.
540 void AssertNotSmi(Register object);
541
542 // Abort execution if argument is not a string, enabled via --debug-code.
543 void AssertString(Register object);
544
545 // Abort execution if argument is not a name, enabled via --debug-code.
546 void AssertName(Register object);
547
548 // Abort execution if argument is not a JSFunction, enabled via --debug-code.
549 void AssertFunction(Register object);
550
551 // Abort execution if argument is not a JSBoundFunction,
552 // enabled via --debug-code.
553 void AssertBoundFunction(Register object);
554
555 // Abort execution if argument is not a JSGeneratorObject,
556 // enabled via --debug-code.
557 void AssertGeneratorObject(Register object);
558
559 // Abort execution if argument is not a JSReceiver, enabled via --debug-code.
560 void AssertReceiver(Register object);
561
562 // Abort execution if argument is not undefined or an AllocationSite, enabled
563 // via --debug-code.
564 void AssertUndefinedOrAllocationSite(Register object);
565
566 // ---------------------------------------------------------------------------
567 // Exception handling
568
569 // Push a new stack handler and link it into stack handler chain.
570 void PushStackHandler();
571
572 // Unlink the stack handler on top of the stack from the stack handler chain.
573 void PopStackHandler();
574
575 // ---------------------------------------------------------------------------
576 // Inline caching support
577
578 void GetNumberHash(Register r0, Register scratch);
579
580 // ---------------------------------------------------------------------------
581 // Allocation support
582
583 // Allocate an object in new space or old space. If the given space
584 // is exhausted control continues at the gc_required label. The allocated
585 // object is returned in result and end of the new object is returned in
586 // result_end. The register scratch can be passed as no_reg in which case
587 // an additional object reference will be added to the reloc info. The
588 // returned pointers in result and result_end have not yet been tagged as
589 // heap objects. If result_contains_top_on_entry is true the content of
590 // result is known to be the allocation top on entry (could be result_end
591 // from a previous call). If result_contains_top_on_entry is true scratch
592 // should be no_reg as it is never used.
593 void Allocate(int object_size, Register result, Register result_end,
594 Register scratch, Label* gc_required, AllocationFlags flags);
595
596 void Allocate(int header_size, ScaleFactor element_size,
597 Register element_count, RegisterValueType element_count_type,
598 Register result, Register result_end, Register scratch,
599 Label* gc_required, AllocationFlags flags);
600
601 void Allocate(Register object_size, Register result, Register result_end,
602 Register scratch, Label* gc_required, AllocationFlags flags);
603
604 // FastAllocate is right now only used for folded allocations. It just
605 // increments the top pointer without checking against limit. This can only
606 // be done if it was proved earlier that the allocation will succeed.
607 void FastAllocate(int object_size, Register result, Register result_end,
608 AllocationFlags flags);
609 void FastAllocate(Register object_size, Register result, Register result_end,
610 AllocationFlags flags);
611
612 // Allocate a heap number in new space with undefined value. The
613 // register scratch2 can be passed as no_reg; the others must be
614 // valid registers. Returns tagged pointer in result register, or
615 // jumps to gc_required if new space is full.
616 void AllocateHeapNumber(Register result, Register scratch1, Register scratch2,
617 Label* gc_required, MutableMode mode = IMMUTABLE);
618
619 // Allocate and initialize a JSValue wrapper with the specified {constructor}
620 // and {value}.
621 void AllocateJSValue(Register result, Register constructor, Register value,
622 Register scratch, Label* gc_required);
623
624 // Initialize fields with filler values. Fields starting at |current_address|
625 // not including |end_address| are overwritten with the value in |filler|. At
626 // the end the loop, |current_address| takes the value of |end_address|.
627 void InitializeFieldsWithFiller(Register current_address,
628 Register end_address, Register filler);
629
630 // ---------------------------------------------------------------------------
631 // Support functions.
632
633 // Check a boolean-bit of a Smi field.
634 void BooleanBitTest(Register object, int field_offset, int bit_index);
635
636 // Check if result is zero and op is negative.
637 void NegativeZeroTest(Register result, Register op, Label* then_label);
638
639 // Check if result is zero and any of op1 and op2 are negative.
640 // Register scratch is destroyed, and it must be different from op2.
641 void NegativeZeroTest(Register result, Register op1, Register op2,
642 Register scratch, Label* then_label);
643
644 // Machine code version of Map::GetConstructor().
645 // |temp| holds |result|'s map when done.
646 void GetMapConstructor(Register result, Register map, Register temp);
647
648 // ---------------------------------------------------------------------------
649 // Runtime calls
650
651 // Call a code stub. Generate the code if necessary.
652 void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None());
653
654 // Tail call a code stub (jump). Generate the code if necessary.
655 void TailCallStub(CodeStub* stub);
656
657 // Return from a code stub after popping its arguments.
658 void StubReturn(int argc);
659
660 // Call a runtime routine.
661 void CallRuntime(const Runtime::Function* f, int num_arguments,
662 SaveFPRegsMode save_doubles = kDontSaveFPRegs);
CallRuntimeSaveDoubles(Runtime::FunctionId fid)663 void CallRuntimeSaveDoubles(Runtime::FunctionId fid) {
664 const Runtime::Function* function = Runtime::FunctionForId(fid);
665 CallRuntime(function, function->nargs, kSaveFPRegs);
666 }
667
668 // Convenience function: Same as above, but takes the fid instead.
669 void CallRuntime(Runtime::FunctionId fid,
670 SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
671 const Runtime::Function* function = Runtime::FunctionForId(fid);
672 CallRuntime(function, function->nargs, save_doubles);
673 }
674
675 // Convenience function: Same as above, but takes the fid instead.
676 void CallRuntime(Runtime::FunctionId fid, int num_arguments,
677 SaveFPRegsMode save_doubles = kDontSaveFPRegs) {
678 CallRuntime(Runtime::FunctionForId(fid), num_arguments, save_doubles);
679 }
680
681 // Convenience function: call an external reference.
682 void CallExternalReference(ExternalReference ref, int num_arguments);
683
684 // Convenience function: tail call a runtime routine (jump).
685 void TailCallRuntime(Runtime::FunctionId fid);
686
687 // Before calling a C-function from generated code, align arguments on stack.
688 // After aligning the frame, arguments must be stored in esp[0], esp[4],
689 // etc., not pushed. The argument count assumes all arguments are word sized.
690 // Some compilers/platforms require the stack to be aligned when calling
691 // C++ code.
692 // Needs a scratch register to do some arithmetic. This register will be
693 // trashed.
694 void PrepareCallCFunction(int num_arguments, Register scratch);
695
696 // Calls a C function and cleans up the space for arguments allocated
697 // by PrepareCallCFunction. The called function is not allowed to trigger a
698 // garbage collection, since that might move the code and invalidate the
699 // return address (unless this is somehow accounted for by the called
700 // function).
701 void CallCFunction(ExternalReference function, int num_arguments);
702 void CallCFunction(Register function, int num_arguments);
703
704 // Jump to a runtime routine.
705 void JumpToExternalReference(const ExternalReference& ext,
706 bool builtin_exit_frame = false);
707
708 // ---------------------------------------------------------------------------
709 // Utilities
710
711 void Ret();
712
713 // Return and drop arguments from stack, where the number of arguments
714 // may be bigger than 2^16 - 1. Requires a scratch register.
715 void Ret(int bytes_dropped, Register scratch);
716
717 // Emit code that loads |parameter_index|'th parameter from the stack to
718 // the register according to the CallInterfaceDescriptor definition.
719 // |sp_to_caller_sp_offset_in_words| specifies the number of words pushed
720 // below the caller's sp (on ia32 it's at least return address).
721 template <class Descriptor>
722 void LoadParameterFromStack(
723 Register reg, typename Descriptor::ParameterIndices parameter_index,
724 int sp_to_ra_offset_in_words = 1) {
725 DCHECK(Descriptor::kPassLastArgsOnStack);
726 DCHECK_LT(parameter_index, Descriptor::kParameterCount);
727 DCHECK_LE(Descriptor::kParameterCount - Descriptor::kStackArgumentsCount,
728 parameter_index);
729 int offset = (Descriptor::kParameterCount - parameter_index - 1 +
730 sp_to_ra_offset_in_words) *
731 kPointerSize;
732 mov(reg, Operand(esp, offset));
733 }
734
735 // Emit code to discard a non-negative number of pointer-sized elements
736 // from the stack, clobbering only the esp register.
737 void Drop(int element_count);
738
Call(Label * target)739 void Call(Label* target) { call(target); }
740 void Call(Handle<Code> target, RelocInfo::Mode rmode,
741 TypeFeedbackId id = TypeFeedbackId::None()) {
742 call(target, rmode, id);
743 }
Jump(Handle<Code> target,RelocInfo::Mode rmode)744 void Jump(Handle<Code> target, RelocInfo::Mode rmode) { jmp(target, rmode); }
Push(Register src)745 void Push(Register src) { push(src); }
Push(const Operand & src)746 void Push(const Operand& src) { push(src); }
Push(Immediate value)747 void Push(Immediate value) { push(value); }
Pop(Register dst)748 void Pop(Register dst) { pop(dst); }
Pop(const Operand & dst)749 void Pop(const Operand& dst) { pop(dst); }
PushReturnAddressFrom(Register src)750 void PushReturnAddressFrom(Register src) { push(src); }
PopReturnAddressTo(Register dst)751 void PopReturnAddressTo(Register dst) { pop(dst); }
752
753 // Non-SSE2 instructions.
754 void Pextrd(Register dst, XMMRegister src, int8_t imm8);
Pinsrd(XMMRegister dst,Register src,int8_t imm8)755 void Pinsrd(XMMRegister dst, Register src, int8_t imm8) {
756 Pinsrd(dst, Operand(src), imm8);
757 }
758 void Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8);
759
Lzcnt(Register dst,Register src)760 void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); }
761 void Lzcnt(Register dst, const Operand& src);
762
Tzcnt(Register dst,Register src)763 void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); }
764 void Tzcnt(Register dst, const Operand& src);
765
Popcnt(Register dst,Register src)766 void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); }
767 void Popcnt(Register dst, const Operand& src);
768
769 // Move if the registers are not identical.
770 void Move(Register target, Register source);
771
772 // Move a constant into a destination using the most efficient encoding.
773 void Move(Register dst, const Immediate& x);
774 void Move(const Operand& dst, const Immediate& x);
775
776 // Move an immediate into an XMM register.
777 void Move(XMMRegister dst, uint32_t src);
778 void Move(XMMRegister dst, uint64_t src);
Move(XMMRegister dst,float src)779 void Move(XMMRegister dst, float src) { Move(dst, bit_cast<uint32_t>(src)); }
Move(XMMRegister dst,double src)780 void Move(XMMRegister dst, double src) { Move(dst, bit_cast<uint64_t>(src)); }
781
Move(Register dst,Handle<Object> handle)782 void Move(Register dst, Handle<Object> handle) { LoadObject(dst, handle); }
Move(Register dst,Smi * source)783 void Move(Register dst, Smi* source) { Move(dst, Immediate(source)); }
784
785 // Push a handle value.
Push(Handle<Object> handle)786 void Push(Handle<Object> handle) { push(Immediate(handle)); }
Push(Smi * smi)787 void Push(Smi* smi) { Push(Immediate(smi)); }
788
CodeObject()789 Handle<Object> CodeObject() {
790 DCHECK(!code_object_.is_null());
791 return code_object_;
792 }
793
794 // Emit code for a truncating division by a constant. The dividend register is
795 // unchanged, the result is in edx, and eax gets clobbered.
796 void TruncatingDiv(Register dividend, int32_t divisor);
797
798 // ---------------------------------------------------------------------------
799 // StatsCounter support
800
801 void SetCounter(StatsCounter* counter, int value);
802 void IncrementCounter(StatsCounter* counter, int value);
803 void DecrementCounter(StatsCounter* counter, int value);
804 void IncrementCounter(Condition cc, StatsCounter* counter, int value);
805 void DecrementCounter(Condition cc, StatsCounter* counter, int value);
806
807 // ---------------------------------------------------------------------------
808 // Debugging
809
810 // Calls Abort(msg) if the condition cc is not satisfied.
811 // Use --debug_code to enable.
812 void Assert(Condition cc, BailoutReason reason);
813
814 void AssertFastElements(Register elements);
815
816 // Like Assert(), but always enabled.
817 void Check(Condition cc, BailoutReason reason);
818
819 // Print a message to stdout and abort execution.
820 void Abort(BailoutReason reason);
821
822 // Check that the stack is aligned.
823 void CheckStackAlignment();
824
825 // Verify restrictions about code generated in stubs.
set_generating_stub(bool value)826 void set_generating_stub(bool value) { generating_stub_ = value; }
generating_stub()827 bool generating_stub() { return generating_stub_; }
set_has_frame(bool value)828 void set_has_frame(bool value) { has_frame_ = value; }
has_frame()829 bool has_frame() { return has_frame_; }
830 inline bool AllowThisStubCall(CodeStub* stub);
831
832 // ---------------------------------------------------------------------------
833 // String utilities.
834
835 // Checks if both objects are sequential one-byte strings, and jumps to label
836 // if either is not.
837 void JumpIfNotBothSequentialOneByteStrings(
838 Register object1, Register object2, Register scratch1, Register scratch2,
839 Label* on_not_flat_one_byte_strings);
840
841 // Checks if the given register or operand is a unique name
842 void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name,
843 Label::Distance distance = Label::kFar) {
844 JumpIfNotUniqueNameInstanceType(Operand(reg), not_unique_name, distance);
845 }
846
847 void JumpIfNotUniqueNameInstanceType(Operand operand, Label* not_unique_name,
848 Label::Distance distance = Label::kFar);
849
850 void EmitSeqStringSetCharCheck(Register string, Register index,
851 Register value, uint32_t encoding_mask);
852
SafepointRegisterStackIndex(Register reg)853 static int SafepointRegisterStackIndex(Register reg) {
854 return SafepointRegisterStackIndex(reg.code());
855 }
856
857 // Load the type feedback vector from a JavaScript frame.
858 void EmitLoadFeedbackVector(Register vector);
859
860 // Activation support.
861 void EnterFrame(StackFrame::Type type);
862 void EnterFrame(StackFrame::Type type, bool load_constant_pool_pointer_reg);
863 void LeaveFrame(StackFrame::Type type);
864
865 void EnterBuiltinFrame(Register context, Register target, Register argc);
866 void LeaveBuiltinFrame(Register context, Register target, Register argc);
867
868 // Expects object in eax and returns map with validated enum cache
869 // in eax. Assumes that any other register can be used as a scratch.
870 void CheckEnumCache(Label* call_runtime);
871
872 // AllocationMemento support. Arrays may have an associated
873 // AllocationMemento object that can be checked for in order to pretransition
874 // to another type.
875 // On entry, receiver_reg should point to the array object.
876 // scratch_reg gets clobbered.
877 // If allocation info is present, conditional code is set to equal.
878 void TestJSArrayForAllocationMemento(Register receiver_reg,
879 Register scratch_reg,
880 Label* no_memento_found);
881
882 private:
883 bool generating_stub_;
884 bool has_frame_;
885 // This handle will be patched with the code object on installation.
886 Handle<Object> code_object_;
887
888 // Helper functions for generating invokes.
889 void InvokePrologue(const ParameterCount& expected,
890 const ParameterCount& actual, Label* done,
891 bool* definitely_mismatches, InvokeFlag flag,
892 Label::Distance done_distance,
893 const CallWrapper& call_wrapper);
894
895 void EnterExitFramePrologue(StackFrame::Type frame_type);
896 void EnterExitFrameEpilogue(int argc, bool save_doubles);
897
898 void LeaveExitFrameEpilogue(bool restore_context);
899
900 // Allocation support helpers.
901 void LoadAllocationTopHelper(Register result, Register scratch,
902 AllocationFlags flags);
903
904 void UpdateAllocationTopHelper(Register result_end, Register scratch,
905 AllocationFlags flags);
906
907 // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace.
908 void InNewSpace(Register object, Register scratch, Condition cc,
909 Label* condition_met,
910 Label::Distance condition_met_distance = Label::kFar);
911
912 // Helper for finding the mark bits for an address. Afterwards, the
913 // bitmap register points at the word with the mark bits and the mask
914 // the position of the first bit. Uses ecx as scratch and leaves addr_reg
915 // unchanged.
916 inline void GetMarkBits(Register addr_reg, Register bitmap_reg,
917 Register mask_reg);
918
919 // Compute memory operands for safepoint stack slots.
920 Operand SafepointRegisterSlot(Register reg);
921 static int SafepointRegisterStackIndex(int reg_code);
922
923 // Needs access to SafepointRegisterStackIndex for compiled frame
924 // traversal.
925 friend class StandardFrame;
926 };
927
928 // The code patcher is used to patch (typically) small parts of code e.g. for
929 // debugging and other types of instrumentation. When using the code patcher
930 // the exact number of bytes specified must be emitted. Is not legal to emit
931 // relocation information. If any of these constraints are violated it causes
932 // an assertion.
933 class CodePatcher {
934 public:
935 CodePatcher(Isolate* isolate, byte* address, int size);
936 ~CodePatcher();
937
938 // Macro assembler to emit code.
masm()939 MacroAssembler* masm() { return &masm_; }
940
941 private:
942 byte* address_; // The address of the code being patched.
943 int size_; // Number of bytes of the expected patch size.
944 MacroAssembler masm_; // Macro assembler used to generate the code.
945 };
946
947 // -----------------------------------------------------------------------------
948 // Static helper functions.
949
950 // Generate an Operand for loading a field from an object.
FieldOperand(Register object,int offset)951 inline Operand FieldOperand(Register object, int offset) {
952 return Operand(object, offset - kHeapObjectTag);
953 }
954
955 // Generate an Operand for loading an indexed field from an object.
FieldOperand(Register object,Register index,ScaleFactor scale,int offset)956 inline Operand FieldOperand(Register object, Register index, ScaleFactor scale,
957 int offset) {
958 return Operand(object, index, scale, offset - kHeapObjectTag);
959 }
960
961 inline Operand FixedArrayElementOperand(Register array, Register index_as_smi,
962 int additional_offset = 0) {
963 int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize;
964 return FieldOperand(array, index_as_smi, times_half_pointer_size, offset);
965 }
966
ContextOperand(Register context,int index)967 inline Operand ContextOperand(Register context, int index) {
968 return Operand(context, Context::SlotOffset(index));
969 }
970
ContextOperand(Register context,Register index)971 inline Operand ContextOperand(Register context, Register index) {
972 return Operand(context, index, times_pointer_size, Context::SlotOffset(0));
973 }
974
NativeContextOperand()975 inline Operand NativeContextOperand() {
976 return ContextOperand(esi, Context::NATIVE_CONTEXT_INDEX);
977 }
978
979 #define ACCESS_MASM(masm) masm->
980
981 } // namespace internal
982 } // namespace v8
983
984 #endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_
985