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Let X86CompilationCallback pass previous frame and return address to X86CompilationCallback2. Remove alloca hack.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28982 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-06-29 01:48:36 +00:00
parent 2a0f984771
commit be33dd95d8
1 changed files with 7 additions and 10 deletions
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17
lib/Target/X86/X86JITInfo.cpp
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@ -64,6 +64,10 @@ extern "C" {
#if defined(__APPLE__)
"andl $-16, %esp\n" // Align ESP on 16-byte boundary
#endif
"subl $16, %esp\n"
"movl 4(%ebp), %eax\n" // Pass prev frame and return address
"movl %eax, 4(%esp)\n"
"movl %ebp, (%esp)\n"
#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__APPLE__)
"call _X86CompilationCallback2\n"
#else
@ -108,22 +112,15 @@ extern "C" {
/// function stub when we did not know the real target of a call. This function
/// must locate the start of the stub or call site and pass it into the JIT
/// compiler function.
extern "C" void X86CompilationCallback2() {
#ifdef _MSC_VER
extern "C" void X86CompilationCallback2() {
assert(sizeof(size_t) == 4); // FIXME: handle Win64
unsigned *RetAddrLoc = (unsigned *)_AddressOfReturnAddress();
RetAddrLoc += 3; // skip over ret addr, edx, eax
unsigned RetAddr = *RetAddrLoc;
#else
unsigned *StackPtr = (unsigned*)__builtin_frame_address(1);
unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(1);
unsigned *RetAddrLoc = &StackPtr[1];
// NOTE: __builtin_frame_address doesn't work if frame pointer elimination has
// been performed. Having a variable sized alloca disables frame pointer
// elimination currently, even if it's dead. This is a gross hack.
alloca(10+(RetAddr >> 31));
extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
intptr_t *RetAddrLoc = &StackPtr[1];
#endif
assert(*RetAddrLoc == RetAddr &&
"Could not find return address on the stack!");