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(this is a corrected patch)

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Calling _chkstk is required on ELF as well as COFF on Windows. Without 
_chkstk, functions requiring large stack crash in initialization code.

Previous code tested for COFF format but not Mach-O and this patch modifies 
the code to test for Windows OS (both Windows target and MingW target) 
but not Mach-O object format: Looks like macho environment was used to 
build some EFI code.
 
Credits to Andrew MacPherson.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193289 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Yaron Keren 2013-10-23 23:37:01 +00:00
parent be87b69a5f
commit faf1415c4f
3 changed files with 4 additions and 2 deletions
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2
lib/Target/X86/X86FrameLowering.cpp
View File

@ -606,7 +606,7 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
// responsible for adjusting the stack pointer. Touching the stack at 4K
// increments is necessary to ensure that the guard pages used by the OS
// virtual memory manager are allocated in correct sequence.
if (NumBytes >= 4096 && STI.isTargetCOFF() && !STI.isTargetEnvMacho()) {
if (NumBytes >= 4096 && STI.isOSWindows() && !STI.isTargetEnvMacho()) {
const char *StackProbeSymbol;
bool isSPUpdateNeeded = false;

2
lib/Target/X86/X86ISelLowering.cpp
View File

@ -631,7 +631,7 @@ void X86TargetLowering::resetOperationActions() {
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho())
if (Subtarget->isOSWindows() && !Subtarget->isTargetEnvMacho())
setOperationAction(ISD::DYNAMIC_STACKALLOC, Subtarget->is64Bit() ?
MVT::i64 : MVT::i32, Custom);
else if (TM.Options.EnableSegmentedStacks)

2
lib/Target/X86/X86Subtarget.h
View File

@ -333,6 +333,8 @@ public:
}
bool isTargetEnvMacho() const { return TargetTriple.isEnvironmentMachO(); }
bool isOSWindows() const { return TargetTriple.isOSWindows(); }
bool isTargetWin64() const {
return In64BitMode && TargetTriple.isOSWindows();
}