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Fix part 1 of pr4682. PICADD is a 16-bit instruction even in thumb2 mode.
[llvm/avr.git] / lib / Target / X86 / X86JITInfo.cpp
blobdc8dd4d723845158c7b01d14ec7cf9eeff36cf4d
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 "llvm/Function.h"
19 #include "llvm/Config/alloca.h"
20 #include "llvm/Support/Compiler.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include <cstdlib>
23 #include <cstring>
24 using namespace llvm;
25
26 // Determine the platform we're running on
27 #if defined (__x86_64__) || defined (_M_AMD64)
28 # define X86_64_JIT
29 #elif defined(__i386__) || defined(i386) || defined(_M_IX86)
30 # define X86_32_JIT
31 #endif
32
33 void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
34 unsigned char *OldByte = (unsigned char *)Old;
35 *OldByte++ = 0xE9; // Emit JMP opcode.
36 unsigned *OldWord = (unsigned *)OldByte;
37 unsigned NewAddr = (intptr_t)New;
38 unsigned OldAddr = (intptr_t)OldWord;
39 *OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code.
40 }
41
42
43 /// JITCompilerFunction - This contains the address of the JIT function used to
44 /// compile a function lazily.
45 static TargetJITInfo::JITCompilerFn JITCompilerFunction;
46
47 // Get the ASMPREFIX for the current host. This is often '_'.
48 #ifndef __USER_LABEL_PREFIX__
49 #define __USER_LABEL_PREFIX__
50 #endif
51 #define GETASMPREFIX2(X) #X
52 #define GETASMPREFIX(X) GETASMPREFIX2(X)
53 #define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__)
54
55 // Check if building with -fPIC
56 #if defined(__PIC__) && __PIC__ && defined(__linux__)
57 #define ASMCALLSUFFIX "@PLT"
58 #else
59 #define ASMCALLSUFFIX
60 #endif
61
62 // For ELF targets, use a .size and .type directive, to let tools
63 // know the extent of functions defined in assembler.
64 #if defined(__ELF__)
65 # define SIZE(sym) ".size " #sym ", . - " #sym "\n"
66 # define TYPE_FUNCTION(sym) ".type " #sym ", @function\n"
67 #else
68 # define SIZE(sym)
69 # define TYPE_FUNCTION(sym)
70 #endif
71
72 // Provide a convenient way for disabling usage of CFI directives.
73 // This is needed for old/broken assemblers (for example, gas on
74 // Darwin is pretty old and doesn't support these directives)
75 #if defined(__APPLE__)
76 # define CFI(x)
77 #else
78 // FIXME: Disable this until we really want to use it. Also, we will
79 // need to add some workarounds for compilers, which support
80 // only subset of these directives.
81 # define CFI(x)
82 #endif
83
84 // Provide a wrapper for X86CompilationCallback2 that saves non-traditional
85 // callee saved registers, for the fastcc calling convention.
86 extern "C" {
87 #if defined(X86_64_JIT)
88 # ifndef _MSC_VER
89 // No need to save EAX/EDX for X86-64.
90 void X86CompilationCallback(void);
91 asm(
92 ".text\n"
93 ".align 8\n"
94 ".globl " ASMPREFIX "X86CompilationCallback\n"
95 TYPE_FUNCTION(X86CompilationCallback)
96 ASMPREFIX "X86CompilationCallback:\n"
97 CFI(".cfi_startproc\n")
98 // Save RBP
99 "pushq %rbp\n"
100 CFI(".cfi_def_cfa_offset 16\n")
101 CFI(".cfi_offset %rbp, -16\n")
102 // Save RSP
103 "movq %rsp, %rbp\n"
104 CFI(".cfi_def_cfa_register %rbp\n")
105 // Save all int arg registers
106 "pushq %rdi\n"
107 CFI(".cfi_rel_offset %rdi, 0\n")
108 "pushq %rsi\n"
109 CFI(".cfi_rel_offset %rsi, 8\n")
110 "pushq %rdx\n"
111 CFI(".cfi_rel_offset %rdx, 16\n")
112 "pushq %rcx\n"
113 CFI(".cfi_rel_offset %rcx, 24\n")
114 "pushq %r8\n"
115 CFI(".cfi_rel_offset %r8, 32\n")
116 "pushq %r9\n"
117 CFI(".cfi_rel_offset %r9, 40\n")
118 // Align stack on 16-byte boundary. ESP might not be properly aligned
119 // (8 byte) if this is called from an indirect stub.
120 "andq $-16, %rsp\n"
121 // Save all XMM arg registers
122 "subq $128, %rsp\n"
123 "movaps %xmm0, (%rsp)\n"
124 "movaps %xmm1, 16(%rsp)\n"
125 "movaps %xmm2, 32(%rsp)\n"
126 "movaps %xmm3, 48(%rsp)\n"
127 "movaps %xmm4, 64(%rsp)\n"
128 "movaps %xmm5, 80(%rsp)\n"
129 "movaps %xmm6, 96(%rsp)\n"
130 "movaps %xmm7, 112(%rsp)\n"
131 // JIT callee
132 "movq %rbp, %rdi\n" // Pass prev frame and return address
133 "movq 8(%rbp), %rsi\n"
134 "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n"
135 // Restore all XMM arg registers
136 "movaps 112(%rsp), %xmm7\n"
137 "movaps 96(%rsp), %xmm6\n"
138 "movaps 80(%rsp), %xmm5\n"
139 "movaps 64(%rsp), %xmm4\n"
140 "movaps 48(%rsp), %xmm3\n"
141 "movaps 32(%rsp), %xmm2\n"
142 "movaps 16(%rsp), %xmm1\n"
143 "movaps (%rsp), %xmm0\n"
144 // Restore RSP
145 "movq %rbp, %rsp\n"
146 CFI(".cfi_def_cfa_register %rsp\n")
147 // Restore all int arg registers
148 "subq $48, %rsp\n"
149 CFI(".cfi_adjust_cfa_offset 48\n")
150 "popq %r9\n"
151 CFI(".cfi_adjust_cfa_offset -8\n")
152 CFI(".cfi_restore %r9\n")
153 "popq %r8\n"
154 CFI(".cfi_adjust_cfa_offset -8\n")
155 CFI(".cfi_restore %r8\n")
156 "popq %rcx\n"
157 CFI(".cfi_adjust_cfa_offset -8\n")
158 CFI(".cfi_restore %rcx\n")
159 "popq %rdx\n"
160 CFI(".cfi_adjust_cfa_offset -8\n")
161 CFI(".cfi_restore %rdx\n")
162 "popq %rsi\n"
163 CFI(".cfi_adjust_cfa_offset -8\n")
164 CFI(".cfi_restore %rsi\n")
165 "popq %rdi\n"
166 CFI(".cfi_adjust_cfa_offset -8\n")
167 CFI(".cfi_restore %rdi\n")
168 // Restore RBP
169 "popq %rbp\n"
170 CFI(".cfi_adjust_cfa_offset -8\n")
171 CFI(".cfi_restore %rbp\n")
172 "ret\n"
173 CFI(".cfi_endproc\n")
174 SIZE(X86CompilationCallback)
175 );
176 # else
177 // No inline assembler support on this platform. The routine is in external
178 // file.
179 void X86CompilationCallback();
180
181 # endif
182 #elif defined (X86_32_JIT)
183 # ifndef _MSC_VER
184 void X86CompilationCallback(void);
185 asm(
186 ".text\n"
187 ".align 8\n"
188 ".globl " ASMPREFIX "X86CompilationCallback\n"
189 TYPE_FUNCTION(X86CompilationCallback)
190 ASMPREFIX "X86CompilationCallback:\n"
191 CFI(".cfi_startproc\n")
192 "pushl %ebp\n"
193 CFI(".cfi_def_cfa_offset 8\n")
194 CFI(".cfi_offset %ebp, -8\n")
195 "movl %esp, %ebp\n" // Standard prologue
196 CFI(".cfi_def_cfa_register %ebp\n")
197 "pushl %eax\n"
198 CFI(".cfi_rel_offset %eax, 0\n")
199 "pushl %edx\n" // Save EAX/EDX/ECX
200 CFI(".cfi_rel_offset %edx, 4\n")
201 "pushl %ecx\n"
202 CFI(".cfi_rel_offset %ecx, 8\n")
203 # if defined(__APPLE__)
204 "andl $-16, %esp\n" // Align ESP on 16-byte boundary
205 # endif
206 "subl $16, %esp\n"
207 "movl 4(%ebp), %eax\n" // Pass prev frame and return address
208 "movl %eax, 4(%esp)\n"
209 "movl %ebp, (%esp)\n"
210 "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n"
211 "movl %ebp, %esp\n" // Restore ESP
212 CFI(".cfi_def_cfa_register %esp\n")
213 "subl $12, %esp\n"
214 CFI(".cfi_adjust_cfa_offset 12\n")
215 "popl %ecx\n"
216 CFI(".cfi_adjust_cfa_offset -4\n")
217 CFI(".cfi_restore %ecx\n")
218 "popl %edx\n"
219 CFI(".cfi_adjust_cfa_offset -4\n")
220 CFI(".cfi_restore %edx\n")
221 "popl %eax\n"
222 CFI(".cfi_adjust_cfa_offset -4\n")
223 CFI(".cfi_restore %eax\n")
224 "popl %ebp\n"
225 CFI(".cfi_adjust_cfa_offset -4\n")
226 CFI(".cfi_restore %ebp\n")
227 "ret\n"
228 CFI(".cfi_endproc\n")
229 SIZE(X86CompilationCallback)
230 );
231
232 // Same as X86CompilationCallback but also saves XMM argument registers.
233 void X86CompilationCallback_SSE(void);
234 asm(
235 ".text\n"
236 ".align 8\n"
237 ".globl " ASMPREFIX "X86CompilationCallback_SSE\n"
238 TYPE_FUNCTION(X86CompilationCallback_SSE)
239 ASMPREFIX "X86CompilationCallback_SSE:\n"
240 CFI(".cfi_startproc\n")
241 "pushl %ebp\n"
242 CFI(".cfi_def_cfa_offset 8\n")
243 CFI(".cfi_offset %ebp, -8\n")
244 "movl %esp, %ebp\n" // Standard prologue
245 CFI(".cfi_def_cfa_register %ebp\n")
246 "pushl %eax\n"
247 CFI(".cfi_rel_offset %eax, 0\n")
248 "pushl %edx\n" // Save EAX/EDX/ECX
249 CFI(".cfi_rel_offset %edx, 4\n")
250 "pushl %ecx\n"
251 CFI(".cfi_rel_offset %ecx, 8\n")
252 "andl $-16, %esp\n" // Align ESP on 16-byte boundary
253 // Save all XMM arg registers
254 "subl $64, %esp\n"
255 // FIXME: provide frame move information for xmm registers.
256 // This can be tricky, because CFA register is ebp (unaligned)
257 // and we need to produce offsets relative to it.
258 "movaps %xmm0, (%esp)\n"
259 "movaps %xmm1, 16(%esp)\n"
260 "movaps %xmm2, 32(%esp)\n"
261 "movaps %xmm3, 48(%esp)\n"
262 "subl $16, %esp\n"
263 "movl 4(%ebp), %eax\n" // Pass prev frame and return address
264 "movl %eax, 4(%esp)\n"
265 "movl %ebp, (%esp)\n"
266 "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n"
267 "addl $16, %esp\n"
268 "movaps 48(%esp), %xmm3\n"
269 CFI(".cfi_restore %xmm3\n")
270 "movaps 32(%esp), %xmm2\n"
271 CFI(".cfi_restore %xmm2\n")
272 "movaps 16(%esp), %xmm1\n"
273 CFI(".cfi_restore %xmm1\n")
274 "movaps (%esp), %xmm0\n"
275 CFI(".cfi_restore %xmm0\n")
276 "movl %ebp, %esp\n" // Restore ESP
277 CFI(".cfi_def_cfa_register esp\n")
278 "subl $12, %esp\n"
279 CFI(".cfi_adjust_cfa_offset 12\n")
280 "popl %ecx\n"
281 CFI(".cfi_adjust_cfa_offset -4\n")
282 CFI(".cfi_restore %ecx\n")
283 "popl %edx\n"
284 CFI(".cfi_adjust_cfa_offset -4\n")
285 CFI(".cfi_restore %edx\n")
286 "popl %eax\n"
287 CFI(".cfi_adjust_cfa_offset -4\n")
288 CFI(".cfi_restore %eax\n")
289 "popl %ebp\n"
290 CFI(".cfi_adjust_cfa_offset -4\n")
291 CFI(".cfi_restore %ebp\n")
292 "ret\n"
293 CFI(".cfi_endproc\n")
294 SIZE(X86CompilationCallback_SSE)
295 );
296 # else
297 void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr);
298
299 _declspec(naked) void X86CompilationCallback(void) {
300 __asm {
301 push ebp
302 mov ebp, esp
303 push eax
304 push edx
305 push ecx
306 and esp, -16
307 mov eax, dword ptr [ebp+4]
308 mov dword ptr [esp+4], eax
309 mov dword ptr [esp], ebp
310 call X86CompilationCallback2
311 mov esp, ebp
312 sub esp, 12
313 pop ecx
314 pop edx
315 pop eax
316 pop ebp
317 ret
318 }
319 }
320
321 # endif // _MSC_VER
322
323 #else // Not an i386 host
324 void X86CompilationCallback() {
325 llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!");
326 }
327 #endif
328 }
329
330 /// X86CompilationCallback2 - This is the target-specific function invoked by the
331 /// function stub when we did not know the real target of a call. This function
332 /// must locate the start of the stub or call site and pass it into the JIT
333 /// compiler function.
334 extern "C" void ATTRIBUTE_USED
335 X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
336 intptr_t *RetAddrLoc = &StackPtr[1];
337 assert(*RetAddrLoc == RetAddr &&
338 "Could not find return address on the stack!");
339
340 // It's a stub if there is an interrupt marker after the call.
341 bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD;
342
343 // The call instruction should have pushed the return value onto the stack...
344 #if defined (X86_64_JIT)
345 RetAddr--; // Backtrack to the reference itself...
346 #else
347 RetAddr -= 4; // Backtrack to the reference itself...
348 #endif
349
350 #if 0
351 DEBUG(errs() << "In callback! Addr=" << (void*)RetAddr
352 << " ESP=" << (void*)StackPtr
353 << ": Resolving call to function: "
354 << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
355 #endif
356
357 // Sanity check to make sure this really is a call instruction.
358 #if defined (X86_64_JIT)
359 assert(((unsigned char*)RetAddr)[-2] == 0x41 &&"Not a call instr!");
360 assert(((unsigned char*)RetAddr)[-1] == 0xFF &&"Not a call instr!");
361 #else
362 assert(((unsigned char*)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
363 #endif
364
365 intptr_t NewVal = (intptr_t)JITCompilerFunction((void*)RetAddr);
366
367 // Rewrite the call target... so that we don't end up here every time we
368 // execute the call.
369 #if defined (X86_64_JIT)
370 if (!isStub)
371 *(intptr_t *)(RetAddr - 0xa) = NewVal;
372 #else
373 *(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4);
374 #endif
375
376 if (isStub) {
377 // If this is a stub, rewrite the call into an unconditional branch
378 // instruction so that two return addresses are not pushed onto the stack
379 // when the requested function finally gets called. This also makes the
380 // 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
381 #if defined (X86_64_JIT)
382 // If the target address is within 32-bit range of the stub, use a
383 // PC-relative branch instead of loading the actual address. (This is
384 // considerably shorter than the 64-bit immediate load already there.)
385 // We assume here intptr_t is 64 bits.
386 intptr_t diff = NewVal-RetAddr+7;
387 if (diff >= -2147483648LL && diff <= 2147483647LL) {
388 *(unsigned char*)(RetAddr-0xc) = 0xE9;
389 *(intptr_t *)(RetAddr-0xb) = diff & 0xffffffff;
390 } else {
391 *(intptr_t *)(RetAddr - 0xa) = NewVal;
392 ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6));
393 }
394 #else
395 ((unsigned char*)RetAddr)[-1] = 0xE9;
396 #endif
397 }
398
399 // Change the return address to reexecute the call instruction...
400 #if defined (X86_64_JIT)
401 *RetAddrLoc -= 0xd;
402 #else
403 *RetAddrLoc -= 5;
404 #endif
405 }
406
407 TargetJITInfo::LazyResolverFn
408 X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
409 JITCompilerFunction = F;
410
411 #if defined (X86_32_JIT) && !defined (_MSC_VER)
412 unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
413 union {
414 unsigned u[3];
415 char c[12];
416 } text;
417
418 if (!X86::GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1)) {
419 // FIXME: support for AMD family of processors.
420 if (memcmp(text.c, "GenuineIntel", 12) == 0) {
421 X86::GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
422 if ((EDX >> 25) & 0x1)
423 return X86CompilationCallback_SSE;
424 }
425 }
426 #endif
427
428 return X86CompilationCallback;
429 }
430
431 void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
432 JITCodeEmitter &JCE) {
433 #if defined (X86_64_JIT)
434 JCE.startGVStub(GV, 8, 8);
435 JCE.emitWordLE((unsigned)(intptr_t)ptr);
436 JCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
437 #else
438 JCE.startGVStub(GV, 4, 4);
439 JCE.emitWordLE((intptr_t)ptr);
440 #endif
441 return JCE.finishGVStub(GV);
442 }
443
444 void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn,
445 JITCodeEmitter &JCE) {
446 // Note, we cast to intptr_t here to silence a -pedantic warning that
447 // complains about casting a function pointer to a normal pointer.
448 #if defined (X86_32_JIT) && !defined (_MSC_VER)
449 bool NotCC = (Fn != (void*)(intptr_t)X86CompilationCallback &&
450 Fn != (void*)(intptr_t)X86CompilationCallback_SSE);
451 #else
452 bool NotCC = Fn != (void*)(intptr_t)X86CompilationCallback;
453 #endif
454 if (NotCC) {
455 #if defined (X86_64_JIT)
456 JCE.startGVStub(F, 13, 4);
457 JCE.emitByte(0x49); // REX prefix
458 JCE.emitByte(0xB8+2); // movabsq r10
459 JCE.emitWordLE((unsigned)(intptr_t)Fn);
460 JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
461 JCE.emitByte(0x41); // REX prefix
462 JCE.emitByte(0xFF); // jmpq *r10
463 JCE.emitByte(2 | (4 << 3) | (3 << 6));
464 #else
465 JCE.startGVStub(F, 5, 4);
466 JCE.emitByte(0xE9);
467 JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
468 #endif
469 return JCE.finishGVStub(F);
470 }
471
472 #if defined (X86_64_JIT)
473 JCE.startGVStub(F, 14, 4);
474 JCE.emitByte(0x49); // REX prefix
475 JCE.emitByte(0xB8+2); // movabsq r10
476 JCE.emitWordLE((unsigned)(intptr_t)Fn);
477 JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
478 JCE.emitByte(0x41); // REX prefix
479 JCE.emitByte(0xFF); // callq *r10
480 JCE.emitByte(2 | (2 << 3) | (3 << 6));
481 #else
482 JCE.startGVStub(F, 6, 4);
483 JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
484
485 JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
486 #endif
487
488 JCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
489 return JCE.finishGVStub(F);
490 }
491
492 void X86JITInfo::emitFunctionStubAtAddr(const Function* F, void *Fn, void *Stub,
493 JITCodeEmitter &JCE) {
494 // Note, we cast to intptr_t here to silence a -pedantic warning that
495 // complains about casting a function pointer to a normal pointer.
496 JCE.startGVStub(F, Stub, 5);
497 JCE.emitByte(0xE9);
498 #if defined (X86_64_JIT)
499 assert(((((intptr_t)Fn-JCE.getCurrentPCValue()-5) << 32) >> 32) ==
500 ((intptr_t)Fn-JCE.getCurrentPCValue()-5)
501 && "PIC displacement does not fit in displacement field!");
502 #endif
503 JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
504 JCE.finishGVStub(F);
505 }
506
507 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the
508 /// specific basic block.
509 uintptr_t X86JITInfo::getPICJumpTableEntry(uintptr_t BB, uintptr_t Entry) {
510 #if defined(X86_64_JIT)
511 return BB - Entry;
512 #else
513 return BB - PICBase;
514 #endif
515 }
516
517 /// relocate - Before the JIT can run a block of code that has been emitted,
518 /// it must rewrite the code to contain the actual addresses of any
519 /// referenced global symbols.
520 void X86JITInfo::relocate(void *Function, MachineRelocation *MR,
521 unsigned NumRelocs, unsigned char* GOTBase) {
522 for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
523 void *RelocPos = (char*)Function + MR->getMachineCodeOffset();
524 intptr_t ResultPtr = (intptr_t)MR->getResultPointer();
525 switch ((X86::RelocationType)MR->getRelocationType()) {
526 case X86::reloc_pcrel_word: {
527 // PC relative relocation, add the relocated value to the value already in
528 // memory, after we adjust it for where the PC is.
529 ResultPtr = ResultPtr -(intptr_t)RelocPos - 4 - MR->getConstantVal();
530 *((unsigned*)RelocPos) += (unsigned)ResultPtr;
531 break;
532 }
533 case X86::reloc_picrel_word: {
534 // PIC base relative relocation, add the relocated value to the value
535 // already in memory, after we adjust it for where the PIC base is.
536 ResultPtr = ResultPtr - ((intptr_t)Function + MR->getConstantVal());
537 *((unsigned*)RelocPos) += (unsigned)ResultPtr;
538 break;
539 }
540 case X86::reloc_absolute_word:
541 // Absolute relocation, just add the relocated value to the value already
542 // in memory.
543 *((unsigned*)RelocPos) += (unsigned)ResultPtr;
544 break;
545 case X86::reloc_absolute_dword:
546 *((intptr_t*)RelocPos) += ResultPtr;
547 break;
548 }
549 }
550 }
551
552 char* X86JITInfo::allocateThreadLocalMemory(size_t size) {
553 #if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER)
554 TLSOffset -= size;
555 return TLSOffset;
556 #else
557 llvm_unreachable("Cannot allocate thread local storage on this arch!");
558 return 0;
559 #endif
560 }
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