From fb8a66fbc558e3dc1f52e5fa4aac3d9ed1fef5ae Mon Sep 17 00:00:00 2001 From: Saleem Abdulrasool Date: Sat, 31 Jan 2015 02:26:37 +0000 Subject: ARM: support stack probe size on Windows on ARM Now that -mstack-probe-size is piped through to the backend via the function attribute as on Windows x86, honour the value to permit handling of non-default values for stack probes. This is needed /Gs with the clang-cl driver or -mstack-probe-size with the clang driver when targeting Windows on ARM. llvm-svn: 227667 --- llvm/lib/Target/ARM/ARMFrameLowering.cpp | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'llvm/lib/Target/ARM/ARMFrameLowering.cpp') diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp index 784755e..2719730 100644 --- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp +++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp @@ -164,9 +164,13 @@ static int sizeOfSPAdjustment(const MachineInstr *MI) { static bool WindowsRequiresStackProbe(const MachineFunction &MF, size_t StackSizeInBytes) { const MachineFrameInfo *MFI = MF.getFrameInfo(); - if (MFI->getStackProtectorIndex() > 0) - return StackSizeInBytes >= 4080; - return StackSizeInBytes >= 4096; + const Function *F = MF.getFunction(); + unsigned StackProbeSize = (MFI->getStackProtectorIndex() > 0) ? 4080 : 4096; + if (F->hasFnAttribute("stack-probe-size")) + F->getFnAttribute("stack-probe-size") + .getValueAsString() + .getAsInteger(0, StackProbeSize); + return StackSizeInBytes >= StackProbeSize; } namespace { -- cgit v1.1