1 //===-- X86JITInfo.cpp - Implement the JIT interfaces for the X86 target --===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the JIT interfaces for the X86 target.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #define DEBUG_TYPE "jit"
15 #include "X86JITInfo.h"
16 #include "X86Relocations.h"
17 #include "X86Subtarget.h"
18 #include "X86TargetMachine.h"
19 #include "llvm/Function.h"
20 #include "llvm/Support/Compiler.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/Valgrind.h"
23 #include <cstdlib>
24 #include <cstring>
25 using namespace llvm;
26
27 // Determine the platform we're running on
28 #if defined (__x86_64__) || defined (_M_AMD64) || defined (_M_X64)
29 # define X86_64_JIT
30 #elif defined(__i386__) || defined(i386) || defined(_M_IX86)
31 # define X86_32_JIT
32 #endif
33
replaceMachineCodeForFunction(void * Old,void * New)34 void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
35 unsigned char *OldByte = (unsigned char *)Old;
36 *OldByte++ = 0xE9; // Emit JMP opcode.
37 unsigned *OldWord = (unsigned *)OldByte;
38 unsigned NewAddr = (intptr_t)New;
39 unsigned OldAddr = (intptr_t)OldWord;
40 *OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code.
41
42 // X86 doesn't need to invalidate the processor cache, so just invalidate
43 // Valgrind's cache directly.
44 sys::ValgrindDiscardTranslations(Old, 5);
45 }
46
47
48 /// JITCompilerFunction - This contains the address of the JIT function used to
49 /// compile a function lazily.
50 static TargetJITInfo::JITCompilerFn JITCompilerFunction;
51
52 // Get the ASMPREFIX for the current host. This is often '_'.
53 #ifndef __USER_LABEL_PREFIX__
54 #define __USER_LABEL_PREFIX__
55 #endif
56 #define GETASMPREFIX2(X) #X
57 #define GETASMPREFIX(X) GETASMPREFIX2(X)
58 #define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__)
59
60 // For ELF targets, use a .size and .type directive, to let tools
61 // know the extent of functions defined in assembler.
62 #if defined(__ELF__)
63 # define SIZE(sym) ".size " #sym ", . - " #sym "\n"
64 # define TYPE_FUNCTION(sym) ".type " #sym ", @function\n"
65 #else
66 # define SIZE(sym)
67 # define TYPE_FUNCTION(sym)
68 #endif
69
70 // Provide a convenient way for disabling usage of CFI directives.
71 // This is needed for old/broken assemblers (for example, gas on
72 // Darwin is pretty old and doesn't support these directives)
73 #if defined(__APPLE__)
74 # define CFI(x)
75 #else
76 // FIXME: Disable this until we really want to use it. Also, we will
77 // need to add some workarounds for compilers, which support
78 // only subset of these directives.
79 # define CFI(x)
80 #endif
81
82 // Provide a wrapper for X86CompilationCallback2 that saves non-traditional
83 // callee saved registers, for the fastcc calling convention.
84 extern "C" {
85 #if defined(X86_64_JIT)
86 # ifndef _MSC_VER
87 // No need to save EAX/EDX for X86-64.
88 void X86CompilationCallback(void);
89 asm(
90 ".text\n"
91 ".align 8\n"
92 ".globl " ASMPREFIX "X86CompilationCallback\n"
93 TYPE_FUNCTION(X86CompilationCallback)
94 ASMPREFIX "X86CompilationCallback:\n"
95 CFI(".cfi_startproc\n")
96 // Save RBP
97 "pushq %rbp\n"
98 CFI(".cfi_def_cfa_offset 16\n")
99 CFI(".cfi_offset %rbp, -16\n")
100 // Save RSP
101 "movq %rsp, %rbp\n"
102 CFI(".cfi_def_cfa_register %rbp\n")
103 // Save all int arg registers
104 "pushq %rdi\n"
105 CFI(".cfi_rel_offset %rdi, 0\n")
106 "pushq %rsi\n"
107 CFI(".cfi_rel_offset %rsi, 8\n")
108 "pushq %rdx\n"
109 CFI(".cfi_rel_offset %rdx, 16\n")
110 "pushq %rcx\n"
111 CFI(".cfi_rel_offset %rcx, 24\n")
112 "pushq %r8\n"
113 CFI(".cfi_rel_offset %r8, 32\n")
114 "pushq %r9\n"
115 CFI(".cfi_rel_offset %r9, 40\n")
116 // Align stack on 16-byte boundary. ESP might not be properly aligned
117 // (8 byte) if this is called from an indirect stub.
118 "andq $-16, %rsp\n"
119 // Save all XMM arg registers
120 "subq $128, %rsp\n"
121 "movaps %xmm0, (%rsp)\n"
122 "movaps %xmm1, 16(%rsp)\n"
123 "movaps %xmm2, 32(%rsp)\n"
124 "movaps %xmm3, 48(%rsp)\n"
125 "movaps %xmm4, 64(%rsp)\n"
126 "movaps %xmm5, 80(%rsp)\n"
127 "movaps %xmm6, 96(%rsp)\n"
128 "movaps %xmm7, 112(%rsp)\n"
129 // JIT callee
130 #ifdef _WIN64
131 "subq $32, %rsp\n"
132 "movq %rbp, %rcx\n" // Pass prev frame and return address
133 "movq 8(%rbp), %rdx\n"
134 "call " ASMPREFIX "X86CompilationCallback2\n"
135 "addq $32, %rsp\n"
136 #else
137 "movq %rbp, %rdi\n" // Pass prev frame and return address
138 "movq 8(%rbp), %rsi\n"
139 "call " ASMPREFIX "X86CompilationCallback2\n"
140 #endif
141 // Restore all XMM arg registers
142 "movaps 112(%rsp), %xmm7\n"
143 "movaps 96(%rsp), %xmm6\n"
144 "movaps 80(%rsp), %xmm5\n"
145 "movaps 64(%rsp), %xmm4\n"
146 "movaps 48(%rsp), %xmm3\n"
147 "movaps 32(%rsp), %xmm2\n"
148 "movaps 16(%rsp), %xmm1\n"
149 "movaps (%rsp), %xmm0\n"
150 // Restore RSP
151 "movq %rbp, %rsp\n"
152 CFI(".cfi_def_cfa_register %rsp\n")
153 // Restore all int arg registers
154 "subq $48, %rsp\n"
155 CFI(".cfi_adjust_cfa_offset 48\n")
156 "popq %r9\n"
157 CFI(".cfi_adjust_cfa_offset -8\n")
158 CFI(".cfi_restore %r9\n")
159 "popq %r8\n"
160 CFI(".cfi_adjust_cfa_offset -8\n")
161 CFI(".cfi_restore %r8\n")
162 "popq %rcx\n"
163 CFI(".cfi_adjust_cfa_offset -8\n")
164 CFI(".cfi_restore %rcx\n")
165 "popq %rdx\n"
166 CFI(".cfi_adjust_cfa_offset -8\n")
167 CFI(".cfi_restore %rdx\n")
168 "popq %rsi\n"
169 CFI(".cfi_adjust_cfa_offset -8\n")
170 CFI(".cfi_restore %rsi\n")
171 "popq %rdi\n"
172 CFI(".cfi_adjust_cfa_offset -8\n")
173 CFI(".cfi_restore %rdi\n")
174 // Restore RBP
175 "popq %rbp\n"
176 CFI(".cfi_adjust_cfa_offset -8\n")
177 CFI(".cfi_restore %rbp\n")
178 "ret\n"
179 CFI(".cfi_endproc\n")
180 SIZE(X86CompilationCallback)
181 );
182 # else
183 // No inline assembler support on this platform. The routine is in external
184 // file.
185 void X86CompilationCallback();
186
187 # endif
188 #elif defined (X86_32_JIT)
189 # ifndef _MSC_VER
190 void X86CompilationCallback(void);
191 asm(
192 ".text\n"
193 ".align 8\n"
194 ".globl " ASMPREFIX "X86CompilationCallback\n"
195 TYPE_FUNCTION(X86CompilationCallback)
196 ASMPREFIX "X86CompilationCallback:\n"
197 CFI(".cfi_startproc\n")
198 "pushl %ebp\n"
199 CFI(".cfi_def_cfa_offset 8\n")
200 CFI(".cfi_offset %ebp, -8\n")
201 "movl %esp, %ebp\n" // Standard prologue
202 CFI(".cfi_def_cfa_register %ebp\n")
203 "pushl %eax\n"
204 CFI(".cfi_rel_offset %eax, 0\n")
205 "pushl %edx\n" // Save EAX/EDX/ECX
206 CFI(".cfi_rel_offset %edx, 4\n")
207 "pushl %ecx\n"
208 CFI(".cfi_rel_offset %ecx, 8\n")
209 # if defined(__APPLE__)
210 "andl $-16, %esp\n" // Align ESP on 16-byte boundary
211 # endif
212 "subl $16, %esp\n"
213 "movl 4(%ebp), %eax\n" // Pass prev frame and return address
214 "movl %eax, 4(%esp)\n"
215 "movl %ebp, (%esp)\n"
216 "call " ASMPREFIX "X86CompilationCallback2\n"
217 "movl %ebp, %esp\n" // Restore ESP
218 CFI(".cfi_def_cfa_register %esp\n")
219 "subl $12, %esp\n"
220 CFI(".cfi_adjust_cfa_offset 12\n")
221 "popl %ecx\n"
222 CFI(".cfi_adjust_cfa_offset -4\n")
223 CFI(".cfi_restore %ecx\n")
224 "popl %edx\n"
225 CFI(".cfi_adjust_cfa_offset -4\n")
226 CFI(".cfi_restore %edx\n")
227 "popl %eax\n"
228 CFI(".cfi_adjust_cfa_offset -4\n")
229 CFI(".cfi_restore %eax\n")
230 "popl %ebp\n"
231 CFI(".cfi_adjust_cfa_offset -4\n")
232 CFI(".cfi_restore %ebp\n")
233 "ret\n"
234 CFI(".cfi_endproc\n")
235 SIZE(X86CompilationCallback)
236 );
237
238 // Same as X86CompilationCallback but also saves XMM argument registers.
239 void X86CompilationCallback_SSE(void);
240 asm(
241 ".text\n"
242 ".align 8\n"
243 ".globl " ASMPREFIX "X86CompilationCallback_SSE\n"
244 TYPE_FUNCTION(X86CompilationCallback_SSE)
245 ASMPREFIX "X86CompilationCallback_SSE:\n"
246 CFI(".cfi_startproc\n")
247 "pushl %ebp\n"
248 CFI(".cfi_def_cfa_offset 8\n")
249 CFI(".cfi_offset %ebp, -8\n")
250 "movl %esp, %ebp\n" // Standard prologue
251 CFI(".cfi_def_cfa_register %ebp\n")
252 "pushl %eax\n"
253 CFI(".cfi_rel_offset %eax, 0\n")
254 "pushl %edx\n" // Save EAX/EDX/ECX
255 CFI(".cfi_rel_offset %edx, 4\n")
256 "pushl %ecx\n"
257 CFI(".cfi_rel_offset %ecx, 8\n")
258 "andl $-16, %esp\n" // Align ESP on 16-byte boundary
259 // Save all XMM arg registers
260 "subl $64, %esp\n"
261 // FIXME: provide frame move information for xmm registers.
262 // This can be tricky, because CFA register is ebp (unaligned)
263 // and we need to produce offsets relative to it.
264 "movaps %xmm0, (%esp)\n"
265 "movaps %xmm1, 16(%esp)\n"
266 "movaps %xmm2, 32(%esp)\n"
267 "movaps %xmm3, 48(%esp)\n"
268 "subl $16, %esp\n"
269 "movl 4(%ebp), %eax\n" // Pass prev frame and return address
270 "movl %eax, 4(%esp)\n"
271 "movl %ebp, (%esp)\n"
272 "call " ASMPREFIX "X86CompilationCallback2\n"
273 "addl $16, %esp\n"
274 "movaps 48(%esp), %xmm3\n"
275 CFI(".cfi_restore %xmm3\n")
276 "movaps 32(%esp), %xmm2\n"
277 CFI(".cfi_restore %xmm2\n")
278 "movaps 16(%esp), %xmm1\n"
279 CFI(".cfi_restore %xmm1\n")
280 "movaps (%esp), %xmm0\n"
281 CFI(".cfi_restore %xmm0\n")
282 "movl %ebp, %esp\n" // Restore ESP
283 CFI(".cfi_def_cfa_register esp\n")
284 "subl $12, %esp\n"
285 CFI(".cfi_adjust_cfa_offset 12\n")
286 "popl %ecx\n"
287 CFI(".cfi_adjust_cfa_offset -4\n")
288 CFI(".cfi_restore %ecx\n")
289 "popl %edx\n"
290 CFI(".cfi_adjust_cfa_offset -4\n")
291 CFI(".cfi_restore %edx\n")
292 "popl %eax\n"
293 CFI(".cfi_adjust_cfa_offset -4\n")
294 CFI(".cfi_restore %eax\n")
295 "popl %ebp\n"
296 CFI(".cfi_adjust_cfa_offset -4\n")
297 CFI(".cfi_restore %ebp\n")
298 "ret\n"
299 CFI(".cfi_endproc\n")
300 SIZE(X86CompilationCallback_SSE)
301 );
302 # else
303 void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr);
304
305 _declspec(naked) void X86CompilationCallback(void) {
306 __asm {
307 push ebp
308 mov ebp, esp
309 push eax
310 push edx
311 push ecx
312 and esp, -16
313 sub esp, 16
314 mov eax, dword ptr [ebp+4]
315 mov dword ptr [esp+4], eax
316 mov dword ptr [esp], ebp
317 call X86CompilationCallback2
318 mov esp, ebp
319 sub esp, 12
320 pop ecx
321 pop edx
322 pop eax
323 pop ebp
324 ret
325 }
326 }
327
328 # endif // _MSC_VER
329
330 #else // Not an i386 host
331 void X86CompilationCallback() {
332 llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!");
333 }
334 #endif
335 }
336
337 /// X86CompilationCallback2 - This is the target-specific function invoked by the
338 /// function stub when we did not know the real target of a call. This function
339 /// must locate the start of the stub or call site and pass it into the JIT
340 /// compiler function.
341 extern "C" {
342 void
X86CompilationCallback2(intptr_t * StackPtr,intptr_t RetAddr)343 X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
344 intptr_t *RetAddrLoc = &StackPtr[1];
345 assert(*RetAddrLoc == RetAddr &&
346 "Could not find return address on the stack!");
347
348 // It's a stub if there is an interrupt marker after the call.
349 bool isStub = ((unsigned char*)RetAddr)[0] == 0xCE;
350
351 // The call instruction should have pushed the return value onto the stack...
352 #if defined (X86_64_JIT)
353 RetAddr--; // Backtrack to the reference itself...
354 #else
355 RetAddr -= 4; // Backtrack to the reference itself...
356 #endif
357
358 #if 0
359 DEBUG(dbgs() << "In callback! Addr=" << (void*)RetAddr
360 << " ESP=" << (void*)StackPtr
361 << ": Resolving call to function: "
362 << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
363 #endif
364
365 // Sanity check to make sure this really is a call instruction.
366 #if defined (X86_64_JIT)
367 assert(((unsigned char*)RetAddr)[-2] == 0x41 &&"Not a call instr!");
368 assert(((unsigned char*)RetAddr)[-1] == 0xFF &&"Not a call instr!");
369 #else
370 assert(((unsigned char*)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
371 #endif
372
373 intptr_t NewVal = (intptr_t)JITCompilerFunction((void*)RetAddr);
374
375 // Rewrite the call target... so that we don't end up here every time we
376 // execute the call.
377 #if defined (X86_64_JIT)
378 assert(isStub &&
379 "X86-64 doesn't support rewriting non-stub lazy compilation calls:"
380 " the call instruction varies too much.");
381 #else
382 *(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4);
383 #endif
384
385 if (isStub) {
386 // If this is a stub, rewrite the call into an unconditional branch
387 // instruction so that two return addresses are not pushed onto the stack
388 // when the requested function finally gets called. This also makes the
389 // 0xCE byte (interrupt) dead, so the marker doesn't effect anything.
390 #if defined (X86_64_JIT)
391 // If the target address is within 32-bit range of the stub, use a
392 // PC-relative branch instead of loading the actual address. (This is
393 // considerably shorter than the 64-bit immediate load already there.)
394 // We assume here intptr_t is 64 bits.
395 intptr_t diff = NewVal-RetAddr+7;
396 if (diff >= -2147483648LL && diff <= 2147483647LL) {
397 *(unsigned char*)(RetAddr-0xc) = 0xE9;
398 *(intptr_t *)(RetAddr-0xb) = diff & 0xffffffff;
399 } else {
400 *(intptr_t *)(RetAddr - 0xa) = NewVal;
401 ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6));
402 }
403 sys::ValgrindDiscardTranslations((void*)(RetAddr-0xc), 0xd);
404 #else
405 ((unsigned char*)RetAddr)[-1] = 0xE9;
406 sys::ValgrindDiscardTranslations((void*)(RetAddr-1), 5);
407 #endif
408 }
409
410 // Change the return address to reexecute the call instruction...
411 #if defined (X86_64_JIT)
412 *RetAddrLoc -= 0xd;
413 #else
414 *RetAddrLoc -= 5;
415 #endif
416 }
417 }
418
419 TargetJITInfo::LazyResolverFn
getLazyResolverFunction(JITCompilerFn F)420 X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
421 JITCompilerFunction = F;
422
423 #if defined (X86_32_JIT) && !defined (_MSC_VER)
424 if (Subtarget->hasSSE1())
425 return X86CompilationCallback_SSE;
426 #endif
427
428 return X86CompilationCallback;
429 }
430
X86JITInfo(X86TargetMachine & tm)431 X86JITInfo::X86JITInfo(X86TargetMachine &tm) : TM(tm) {
432 Subtarget = &TM.getSubtarget<X86Subtarget>();
433 useGOT = 0;
434 TLSOffset = 0;
435 }
436
emitGlobalValueIndirectSym(const GlobalValue * GV,void * ptr,JITCodeEmitter & JCE)437 void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
438 JITCodeEmitter &JCE) {
439 #if defined (X86_64_JIT)
440 const unsigned Alignment = 8;
441 uint8_t Buffer[8];
442 uint8_t *Cur = Buffer;
443 MachineCodeEmitter::emitWordLEInto(Cur, (unsigned)(intptr_t)ptr);
444 MachineCodeEmitter::emitWordLEInto(Cur, (unsigned)(((intptr_t)ptr) >> 32));
445 #else
446 const unsigned Alignment = 4;
447 uint8_t Buffer[4];
448 uint8_t *Cur = Buffer;
449 MachineCodeEmitter::emitWordLEInto(Cur, (intptr_t)ptr);
450 #endif
451 return JCE.allocIndirectGV(GV, Buffer, sizeof(Buffer), Alignment);
452 }
453
getStubLayout()454 TargetJITInfo::StubLayout X86JITInfo::getStubLayout() {
455 // The 64-bit stub contains:
456 // movabs r10 <- 8-byte-target-address # 10 bytes
457 // call|jmp *r10 # 3 bytes
458 // The 32-bit stub contains a 5-byte call|jmp.
459 // If the stub is a call to the compilation callback, an extra byte is added
460 // to mark it as a stub.
461 StubLayout Result = {14, 4};
462 return Result;
463 }
464
emitFunctionStub(const Function * F,void * Target,JITCodeEmitter & JCE)465 void *X86JITInfo::emitFunctionStub(const Function* F, void *Target,
466 JITCodeEmitter &JCE) {
467 // Note, we cast to intptr_t here to silence a -pedantic warning that
468 // complains about casting a function pointer to a normal pointer.
469 #if defined (X86_32_JIT) && !defined (_MSC_VER)
470 bool NotCC = (Target != (void*)(intptr_t)X86CompilationCallback &&
471 Target != (void*)(intptr_t)X86CompilationCallback_SSE);
472 #else
473 bool NotCC = Target != (void*)(intptr_t)X86CompilationCallback;
474 #endif
475 JCE.emitAlignment(4);
476 void *Result = (void*)JCE.getCurrentPCValue();
477 if (NotCC) {
478 #if defined (X86_64_JIT)
479 JCE.emitByte(0x49); // REX prefix
480 JCE.emitByte(0xB8+2); // movabsq r10
481 JCE.emitWordLE((unsigned)(intptr_t)Target);
482 JCE.emitWordLE((unsigned)(((intptr_t)Target) >> 32));
483 JCE.emitByte(0x41); // REX prefix
484 JCE.emitByte(0xFF); // jmpq *r10
485 JCE.emitByte(2 | (4 << 3) | (3 << 6));
486 #else
487 JCE.emitByte(0xE9);
488 JCE.emitWordLE((intptr_t)Target-JCE.getCurrentPCValue()-4);
489 #endif
490 return Result;
491 }
492
493 #if defined (X86_64_JIT)
494 JCE.emitByte(0x49); // REX prefix
495 JCE.emitByte(0xB8+2); // movabsq r10
496 JCE.emitWordLE((unsigned)(intptr_t)Target);
497 JCE.emitWordLE((unsigned)(((intptr_t)Target) >> 32));
498 JCE.emitByte(0x41); // REX prefix
499 JCE.emitByte(0xFF); // callq *r10
500 JCE.emitByte(2 | (2 << 3) | (3 << 6));
501 #else
502 JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
503
504 JCE.emitWordLE((intptr_t)Target-JCE.getCurrentPCValue()-4);
505 #endif
506
507 // This used to use 0xCD, but that value is used by JITMemoryManager to
508 // initialize the buffer with garbage, which means it may follow a
509 // noreturn function call, confusing X86CompilationCallback2. PR 4929.
510 JCE.emitByte(0xCE); // Interrupt - Just a marker identifying the stub!
511 return Result;
512 }
513
514 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
515 /// specific basic block.
getPICJumpTableEntry(uintptr_t BB,uintptr_t Entry)516 uintptr_t X86JITInfo::getPICJumpTableEntry(uintptr_t BB, uintptr_t Entry) {
517 #if defined(X86_64_JIT)
518 return BB - Entry;
519 #else
520 return BB - PICBase;
521 #endif
522 }
523
524 /// relocate - Before the JIT can run a block of code that has been emitted,
525 /// it must rewrite the code to contain the actual addresses of any
526 /// referenced global symbols.
relocate(void * Function,MachineRelocation * MR,unsigned NumRelocs,unsigned char * GOTBase)527 void X86JITInfo::relocate(void *Function, MachineRelocation *MR,
528 unsigned NumRelocs, unsigned char* GOTBase) {
529 for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
530 void *RelocPos = (char*)Function + MR->getMachineCodeOffset();
531 intptr_t ResultPtr = (intptr_t)MR->getResultPointer();
532 switch ((X86::RelocationType)MR->getRelocationType()) {
533 case X86::reloc_pcrel_word: {
534 // PC relative relocation, add the relocated value to the value already in
535 // memory, after we adjust it for where the PC is.
536 ResultPtr = ResultPtr -(intptr_t)RelocPos - 4 - MR->getConstantVal();
537 *((unsigned*)RelocPos) += (unsigned)ResultPtr;
538 break;
539 }
540 case X86::reloc_picrel_word: {
541 // PIC base relative relocation, add the relocated value to the value
542 // already in memory, after we adjust it for where the PIC base is.
543 ResultPtr = ResultPtr - ((intptr_t)Function + MR->getConstantVal());
544 *((unsigned*)RelocPos) += (unsigned)ResultPtr;
545 break;
546 }
547 case X86::reloc_absolute_word:
548 case X86::reloc_absolute_word_sext:
549 // Absolute relocation, just add the relocated value to the value already
550 // in memory.
551 *((unsigned*)RelocPos) += (unsigned)ResultPtr;
552 break;
553 case X86::reloc_absolute_dword:
554 *((intptr_t*)RelocPos) += ResultPtr;
555 break;
556 }
557 }
558 }
559
allocateThreadLocalMemory(size_t size)560 char* X86JITInfo::allocateThreadLocalMemory(size_t size) {
561 #if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER)
562 TLSOffset -= size;
563 return TLSOffset;
564 #else
565 llvm_unreachable("Cannot allocate thread local storage on this arch!");
566 return 0;
567 #endif
568 }
569