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Let X86CompilationCallback pass previous frame and return address to X86CompilationCallback2. Remove alloca hack.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28982 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -64,6 +64,10 @@ extern "C" {
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#if defined(__APPLE__)
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"andl $-16, %esp\n" // Align ESP on 16-byte boundary
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#endif
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"subl $16, %esp\n"
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"movl 4(%ebp), %eax\n" // Pass prev frame and return address
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"movl %eax, 4(%esp)\n"
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"movl %ebp, (%esp)\n"
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#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(__APPLE__)
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"call _X86CompilationCallback2\n"
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#else
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@ -108,22 +112,15 @@ extern "C" {
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/// function stub when we did not know the real target of a call. This function
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/// must locate the start of the stub or call site and pass it into the JIT
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/// compiler function.
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extern "C" void X86CompilationCallback2() {
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#ifdef _MSC_VER
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extern "C" void X86CompilationCallback2() {
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assert(sizeof(size_t) == 4); // FIXME: handle Win64
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unsigned *RetAddrLoc = (unsigned *)_AddressOfReturnAddress();
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RetAddrLoc += 3; // skip over ret addr, edx, eax
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unsigned RetAddr = *RetAddrLoc;
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#else
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unsigned *StackPtr = (unsigned*)__builtin_frame_address(1);
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unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(1);
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unsigned *RetAddrLoc = &StackPtr[1];
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// NOTE: __builtin_frame_address doesn't work if frame pointer elimination has
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// been performed. Having a variable sized alloca disables frame pointer
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// elimination currently, even if it's dead. This is a gross hack.
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alloca(10+(RetAddr >> 31));
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extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
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intptr_t *RetAddrLoc = &StackPtr[1];
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#endif
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assert(*RetAddrLoc == RetAddr &&
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"Could not find return address on the stack!");
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