[PATCH][MC/X86_64] Implement Win64 exception handling
Kai Nacke
kai.nacke at redstar.de
Wed Jan 15 03:01:09 PST 2014
Hi Nico!
On 09.01.2014 15:04, Nico Rieck wrote:
> Hello Kai!
>
> On 09.01.2014 08:04, Kai Nacke wrote:
>> the latest commits broke the patch. This version applies cleanly to trunk.
>
>
> + llvm_unreachable("X86::X86::SUB64ri8/32 not allowed with these operands");
>
> Any reason why "X86::" is used twice here and in other places?
I think just a copy'n'paste error. I removed it.
>
> + case X86::MOV64mr:
> + case X86::MOVAPSmr:
> + DReg = MI->getOperand(0).getReg();
> + SReg = MI->getOperand(1).getReg();
> + Offset = MI->getOperand(4).getImm();
>
> The ModRM byte comes before SReg, which makes Offset operand 3,
> and SReg 5. While you're at it, check that Scale/Index/Segment
> are 1/0/0 respectively.
I added this hopefully in the correct way.
>
> + case X86::LEA64r:
> + DReg = MI->getOperand(0).getReg();
> + SReg = MI->getOperand(1).getReg();
> + Offset = MI->getOperand(4).getImm();
> + if (SReg == RI->getStackRegister()) {
> + assert(Offset < 0 && "Offset must be negativ");
>
> IMO just put this Offset check into the SReg if.
Agree.
>
> + if (DReg == RI->getStackRegister()) {
> + OutStreamer.EmitWin64EHAllocStack(-Offset);
> + } else if (DReg == RI->getFrameRegister(*MF)) {
> + OutStreamer.EmitWin64EHSetFrame(RI->getSEHRegNum(DReg), -Offset);
> + } else
> + llvm_unreachable("X86::X86::LEA64r not allowed with these operands");
>
> I noticed that the order here is very important because getFrameRegister
> can also return SP. There should be a comment stating this, maybe
> "Check stack register first in case there is no frame register."?
I added the comment.
>
>
> diff --git a/test/CodeGen/X86/win64_eh.ll b/test/CodeGen/X86/win64_eh.ll
> new file mode 100644
> index 0000000..1e662bd
> --- /dev/null
> +++ b/test/CodeGen/X86/win64_eh.ll
> @@ -0,0 +1,180 @@
> +; RUN: llc < %s -O0 -mcpu=corei7 -mtriple=x86_64-pc-win32 | FileCheck %s -check-prefix=WIN64
> +; RUN: llc < %s -O0 -mcpu=corei7 -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW64
> +; RUN: llc < %s -O0 -mcpu=atom -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW64-ATOM
> +
> +; Check function with nor prolog
>
> Typo, and "without" sounds better anyway. ;)
Thanks!!
>
> ; Checks a stack allocation requiring call to __chkstk/___chkstk_ms
> define void @foo2() uwtable {
> entry:
> %baz = alloca [4000 x i16], align 2
> ret void
> }
> ; WIN64: .seh_proc foo2
> ; WIN64: movabsq $8000, %rax
> ; WIN64: callq __chkstk
> ; WIN64: subq %rax, %rsp
>
> No check for ".seh_stackalloc 8000"?
>
> ; WIN64: .seh_endprologue
> ; WIN64: ret
> ; WIN64: .seh_endproc
>
>
> Since WIN64 and MINGW64 are mostly equivalent you could use a common
> FileCheck prefix for both.
I now use a common prefix. I removed the atom checks because of your
hint regarding LEA. I need to add these as soon as your fix for PR16799
is ready.
>
> The rest LGTM. Let's hope someone else can greenlight it.
@Anton
What is your opinion?
Regards,
Kai
>
> -Nico
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
>
>
-------------- next part --------------
>From 14b96969c4ba42863b3b906026c663770c189eeb Mon Sep 17 00:00:00 2001
From: kai <kai at redstar.de>
Date: Wed, 29 May 2013 07:10:59 +0200
Subject: [PATCH] Add Win64 exception handling.
This patch enables Dwarf exception handling on Windows 64 based on the
structured exception handling (SEH) mechanism built into the OS. This
is similar to the way exception handling is implemented in gcc 4.8
(mingw64) on Windows 64.
For each instruction in the frame setup range, the needed unwind
information is emitted. In order to match the gcc implementation, the
personality function is emitted as handler function and the Dwarf code
is emitted as handler data.
Most of this patch is based on work by Charles Davis.
---
lib/CodeGen/AsmPrinter/Win64Exception.cpp | 12 +--
lib/MC/MCObjectFileInfo.cpp | 15 ++--
lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp | 17 +++-
lib/Target/X86/X86AsmPrinter.h | 2 +
lib/Target/X86/X86ISelLowering.cpp | 3 +-
lib/Target/X86/X86MCInstLower.cpp | 129 ++++++++++++++++++++++++++
test/CodeGen/X86/avx-win64-args.ll | 2 +
test/CodeGen/X86/win64_eh.ll | 130 +++++++++++++++++++++++++++
8 files changed, 291 insertions(+), 19 deletions(-)
create mode 100644 test/CodeGen/X86/win64_eh.ll
diff --git a/lib/CodeGen/AsmPrinter/Win64Exception.cpp b/lib/CodeGen/AsmPrinter/Win64Exception.cpp
index 4844cf6..851196f 100644
--- a/lib/CodeGen/AsmPrinter/Win64Exception.cpp
+++ b/lib/CodeGen/AsmPrinter/Win64Exception.cpp
@@ -78,9 +78,9 @@ void Win64Exception::beginFunction(const MachineFunction *MF) {
if (!shouldEmitPersonality)
return;
- MCSymbol *GCCHandlerSym =
- Asm->GetExternalSymbolSymbol("_GCC_specific_handler");
- Asm->OutStreamer.EmitWin64EHHandler(GCCHandlerSym, true, true);
+ const MCSymbol *PersHandlerSym = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang,
+ MMI);
+ Asm->OutStreamer.EmitWin64EHHandler(PersHandlerSym, true, true);
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
Asm->getFunctionNumber()));
@@ -99,14 +99,8 @@ void Win64Exception::endFunction(const MachineFunction *) {
MMI->TidyLandingPads();
if (shouldEmitPersonality) {
- const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
- const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
- const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang, MMI);
-
Asm->OutStreamer.PushSection();
Asm->OutStreamer.EmitWin64EHHandlerData();
- Asm->OutStreamer.EmitValue(MCSymbolRefExpr::Create(Sym, Asm->OutContext),
- 4);
EmitExceptionTable();
Asm->OutStreamer.PopSection();
}
diff --git a/lib/MC/MCObjectFileInfo.cpp b/lib/MC/MCObjectFileInfo.cpp
index 4cc872e..3d0dc72 100644
--- a/lib/MC/MCObjectFileInfo.cpp
+++ b/lib/MC/MCObjectFileInfo.cpp
@@ -575,11 +575,16 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
// though it contains relocatable pointers. In PIC mode, this is probably a
// big runtime hit for C++ apps. Either the contents of the LSDA need to be
// adjusted or this should be a data section.
- LSDASection =
- Ctx->getCOFFSection(".gcc_except_table",
- COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
- COFF::IMAGE_SCN_MEM_READ,
- SectionKind::getReadOnly());
+ if (T.getOS() == Triple::Win32) {
+ // On Windows with SEH, the LSDA is emitted into the .xdata section
+ LSDASection = 0;
+ } else {
+ LSDASection =
+ Ctx->getCOFFSection(".gcc_except_table",
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ,
+ SectionKind::getReadOnly());
+ }
// Debug info.
DwarfAbbrevSection =
diff --git a/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp b/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
index 7d93555..4a7976e 100644
--- a/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
@@ -136,7 +136,8 @@ getNonexecutableStackSection(MCContext &Ctx) const {
void X86MCAsmInfoMicrosoft::anchor() { }
X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {
- if (Triple.getArch() == Triple::x86_64)
+ bool is64Bit = Triple.getArch() == Triple::x86_64;
+ if (is64Bit)
PrivateGlobalPrefix = ".L";
AssemblerDialect = AsmWriterFlavor;
@@ -144,18 +145,26 @@ X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {
TextAlignFillValue = 0x90;
AllowAtInName = true;
+
+ // Exceptions handling
+ if (is64Bit)
+ ExceptionsType = ExceptionHandling::Win64;
}
void X86MCAsmInfoGNUCOFF::anchor() { }
X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
- if (Triple.getArch() == Triple::x86_64)
+ bool is64Bit = Triple.getArch() == Triple::x86_64;
+ if (is64Bit)
PrivateGlobalPrefix = ".L";
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
- // Exceptions handling
- ExceptionsType = ExceptionHandling::DwarfCFI;
+ // Exception handling
+ if (is64Bit && Triple.getOS() == Triple::MinGW32)
+ ExceptionsType = ExceptionHandling::Win64;
+ else
+ ExceptionsType = ExceptionHandling::DwarfCFI;
}
diff --git a/lib/Target/X86/X86AsmPrinter.h b/lib/Target/X86/X86AsmPrinter.h
index d6adf68..2477a84 100644
--- a/lib/Target/X86/X86AsmPrinter.h
+++ b/lib/Target/X86/X86AsmPrinter.h
@@ -27,6 +27,8 @@ class LLVM_LIBRARY_VISIBILITY X86AsmPrinter : public AsmPrinter {
const X86Subtarget *Subtarget;
StackMaps SM;
+ void EmitUnwindingInstruction(const MachineInstr *MI);
+
public:
explicit X86AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer), SM(*this) {
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 431101b..a8857e1 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -597,7 +597,8 @@ void X86TargetLowering::resetOperationActions() {
// FIXME - use subtarget debug flags
if (!Subtarget->isTargetDarwin() &&
!Subtarget->isTargetELF() &&
- !Subtarget->isTargetCygMing()) {
+ !Subtarget->isTargetCygMing() &&
+ !Subtarget->isTargetWin64()) {
setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
}
diff --git a/lib/Target/X86/X86MCInstLower.cpp b/lib/Target/X86/X86MCInstLower.cpp
index 8b4195f..467c0d7 100644
--- a/lib/Target/X86/X86MCInstLower.cpp
+++ b/lib/Target/X86/X86MCInstLower.cpp
@@ -774,7 +774,129 @@ static void LowerPATCHPOINT(MCStreamer &OS, StackMaps &SM,
EmitNops(OS, NumBytes - EncodedBytes, Is64Bit);
}
+static bool isCalleeSavedReg(const MachineFunction *MF,
+ const TargetRegisterInfo *RI, unsigned Reg) {
+ const uint16_t *NVRegs = RI->getCalleeSavedRegs(MF);
+ while (*NVRegs) {
+ if (*NVRegs == Reg)
+ return true;
+ NVRegs++;
+ }
+ return false;
+}
+
+void X86AsmPrinter::EmitUnwindingInstruction(const MachineInstr *MI) {
+ assert(MI->getFlag(MachineInstr::FrameSetup) &&
+ "Only call frame setup instructions allowed here!");
+ unsigned SReg, DReg;
+ int64_t Offset;
+ const X86RegisterInfo *RI =
+ static_cast<const X86RegisterInfo *>(TM.getRegisterInfo());
+ switch (MI->getOpcode()) {
+ default: llvm_unreachable("Unknown frame setup opcode!");
+ case X86::PUSH64r:
+ SReg = MI->getOperand(0).getReg();
+ if (isCalleeSavedReg(MI->getParent()->getParent(), RI, SReg))
+ OutStreamer.EmitWin64EHPushReg(RI->getSEHRegNum(SReg));
+ else
+ OutStreamer.EmitWin64EHAllocStack(8);
+ break;
+ case X86::SUB64ri8:
+ case X86::SUB64ri32:
+ DReg = MI->getOperand(0).getReg();
+ Offset = MI->getOperand(2).getImm();
+ if (DReg == RI->getStackRegister()) {
+ OutStreamer.EmitWin64EHAllocStack(Offset);
+ } else
+ llvm_unreachable("X86::SUB64ri8/32 not allowed with these operands");
+ break;
+ case X86::MOV64rr:
+ DReg = MI->getOperand(0).getReg();
+ SReg = MI->getOperand(1).getReg();
+ if (DReg == RI->getFrameRegister(*MF) && SReg == RI->getStackRegister())
+ OutStreamer.EmitWin64EHSetFrame(RI->getSEHRegNum(DReg), 0);
+ else
+ llvm_unreachable("X86::MOV64rr not allowed with these operands");
+ break;
+ case X86::MOV64mr:
+ case X86::MOVAPSmr:
+ DReg = MI->getOperand(0).getReg();
+ SReg = MI->getOperand(5).getReg();
+ if (DReg == RI->getFrameRegister(*MF) || DReg == RI->getStackRegister()) {
+ Offset = MI->getOperand(3).getImm();
+ if (MI->getOperand(1).getImm() != 1 || MI->getOperand(2).getImm() != 0 ||
+ MI->getOperand(4).getImm() != 0)
+ llvm_unreachable("X86::MOV64mr not allowed with these operands");
+ if (MI->getOpcode() == X86::MOVAPSmr)
+ OutStreamer.EmitWin64EHSaveXMM(RI->getSEHRegNum(SReg), Offset);
+ else
+ OutStreamer.EmitWin64EHSaveReg(RI->getSEHRegNum(SReg), Offset);
+ } else
+ llvm_unreachable("X86::MOV64mr not allowed with these operands");
+ break;
+ case X86::LEA64r:
+ DReg = MI->getOperand(0).getReg();
+ SReg = MI->getOperand(1).getReg();
+ Offset = MI->getOperand(4).getImm();
+ if (SReg == RI->getStackRegister() && Offset > 0) {
+ // Check stack register first in case there is no frame register.
+ if (DReg == RI->getStackRegister()) {
+ OutStreamer.EmitWin64EHAllocStack(Offset);
+ } else if (DReg == RI->getFrameRegister(*MF)) {
+ OutStreamer.EmitWin64EHSetFrame(RI->getSEHRegNum(DReg), Offset);
+ } else
+ llvm_unreachable("X86::LEA64r not allowed with these operands");
+ }
+ else
+ llvm_unreachable("X86::LEA64r not allowed with these operands");
+ break;
+ case X86::MOV64ri:
+ // Occurs before alloca()/call to __chkstk/___chkstk_ms
+ if (!(MI->getNextNode()
+ && MI->getNextNode()->getOpcode() == X86::W64ALLOCA
+ && MI->getOperand(0).getReg() == X86::RAX))
+ llvm_unreachable("X86::MOV64ri only allowed before X86::W64ALLOCA");
+ break;
+ case X86::W64ALLOCA:
+ // Occurs if call to __chkstk/___chkstk_ms is used.
+ break;
+ case X86::SUB64rr:
+ // Occurs after call to __chkstk/___chkstk_ms on Win64
+ if (!(MI->getPrevNode()
+ && MI->getPrevNode()->getOpcode() == X86::W64ALLOCA
+ && MI->getOperand(0).getReg() == RI->getStackRegister()
+ && MI->getOperand(2).getReg() == X86::RAX
+ && getSubtarget().isTargetWin64()))
+ llvm_unreachable("X86::SUB64rr only allowed after X86::W64ALLOCA");
+ const MachineInstr *MoveMI = MI->getPrevNode()->getPrevNode();
+ if (!(MoveMI && MoveMI->getOpcode() == X86::MOV64ri))
+ llvm_unreachable("X86::MOV64ri required before X86::W64ALLOCA");
+ Offset = MoveMI->getOperand(1).getImm();
+ OutStreamer.EmitWin64EHAllocStack(Offset);
+ break;
+ }
+ // Prolog ends if next instruction does not have the FrameSetup flag
+ // and is not the PROLOG_LABEL.
+ if (MI->getNextNode()) {
+ const MachineInstr *MI2 = MI->getNextNode();
+ if (!(MI2->getFlag(MachineInstr::FrameSetup) ||
+ (MI2->isPrologLabel() && MI2->getNextNode() &&
+ MI2->getNextNode()->getFlag(MachineInstr::FrameSetup)))) {
+ OutStreamer.EmitWin64EHEndProlog();
+ }
+ }
+}
+
void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
+ // Emit end of prolog for Win64-style EH if there is no framesetup.
+ if (MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
+ !MI->getFlag(MachineInstr::FrameSetup) &&
+ MI->getParent()->getParent()->getFunction()->needsUnwindTableEntry() &&
+ MI == MI->getParent()->instr_begin() &&
+ MI->getParent()->getNumber() == 0) {
+ OutStreamer.EmitWin64EHEndProlog();
+ }
+
X86MCInstLower MCInstLowering(*MF, *this);
switch (MI->getOpcode()) {
case TargetOpcode::DBG_VALUE:
@@ -886,4 +1008,11 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
OutStreamer.EmitInstruction(TmpInst);
+
+ // Emit SEH unwind info for Win64-style EH.
+ if (MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
+ MI->getFlag(MachineInstr::FrameSetup) &&
+ MI->getParent()->getParent()->getFunction()->needsUnwindTableEntry()) {
+ EmitUnwindingInstruction(MI);
+ }
}
diff --git a/test/CodeGen/X86/avx-win64-args.ll b/test/CodeGen/X86/avx-win64-args.ll
index 85b2634..3b2f3d4 100644
--- a/test/CodeGen/X86/avx-win64-args.ll
+++ b/test/CodeGen/X86/avx-win64-args.ll
@@ -1,4 +1,6 @@
; RUN: llc < %s -mcpu=corei7-avx -mattr=+avx | FileCheck %s
+; XFAIL: *
+; See PR16779.
target triple = "x86_64-pc-win32"
declare <8 x float> @foo(<8 x float>, i32)
diff --git a/test/CodeGen/X86/win64_eh.ll b/test/CodeGen/X86/win64_eh.ll
new file mode 100644
index 0000000..101ae39
--- /dev/null
+++ b/test/CodeGen/X86/win64_eh.ll
@@ -0,0 +1,130 @@
+; RUN: llc < %s -O0 -mcpu=corei7 -mtriple=x86_64-pc-win32 | FileCheck %s -check-prefix=WIN64
+; RUN: llc < %s -O0 -mcpu=corei7 -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=WIN64
+
+; Check function without prolog
+define void @foo0() uwtable {
+entry:
+ ret void
+}
+; WIN64: .seh_proc foo0
+; WIN64: .seh_endprologue
+; WIN64: ret
+; WIN64: .seh_endproc
+
+; Checks a small stack allocation
+define void @foo1() uwtable {
+entry:
+ %baz = alloca [2000 x i16], align 2
+ ret void
+}
+; WIN64: .seh_proc foo1
+; WIN64: subq $4000, %rsp
+; WIN64: .seh_stackalloc 4000
+; WIN64: .seh_endprologue
+; WIN64: addq $4000, %rsp
+; WIN64: ret
+; WIN64: .seh_endproc
+
+; Checks a stack allocation requiring call to __chkstk/___chkstk_ms
+define void @foo2() uwtable {
+entry:
+ %baz = alloca [4000 x i16], align 2
+ ret void
+}
+; WIN64: .seh_proc foo2
+; WIN64: movabsq $8000, %rax
+; WIN64: callq {{__chkstk|___chkstk_ms}}
+; WIN64: subq %rax, %rsp
+; WIN64: .seh_stackalloc 8000
+; WIN64: .seh_endprologue
+; WIN64: addq $8000, %rsp
+; WIN64: ret
+; WIN64: .seh_endproc
+
+
+; Checks stack push
+define i32 @foo3(i32 %f_arg, i32 %e_arg, i32 %d_arg, i32 %c_arg, i32 %b_arg, i32 %a_arg) uwtable {
+entry:
+ %a = alloca i32
+ %b = alloca i32
+ %c = alloca i32
+ %d = alloca i32
+ %e = alloca i32
+ %f = alloca i32
+ store i32 %a_arg, i32* %a
+ store i32 %b_arg, i32* %b
+ store i32 %c_arg, i32* %c
+ store i32 %d_arg, i32* %d
+ store i32 %e_arg, i32* %e
+ store i32 %f_arg, i32* %f
+ %tmp = load i32* %a
+ %tmp1 = mul i32 %tmp, 2
+ %tmp2 = load i32* %b
+ %tmp3 = mul i32 %tmp2, 3
+ %tmp4 = add i32 %tmp1, %tmp3
+ %tmp5 = load i32* %c
+ %tmp6 = mul i32 %tmp5, 5
+ %tmp7 = add i32 %tmp4, %tmp6
+ %tmp8 = load i32* %d
+ %tmp9 = mul i32 %tmp8, 7
+ %tmp10 = add i32 %tmp7, %tmp9
+ %tmp11 = load i32* %e
+ %tmp12 = mul i32 %tmp11, 11
+ %tmp13 = add i32 %tmp10, %tmp12
+ %tmp14 = load i32* %f
+ %tmp15 = mul i32 %tmp14, 13
+ %tmp16 = add i32 %tmp13, %tmp15
+ ret i32 %tmp16
+}
+; WIN64: .seh_proc foo3
+; WIN64: pushq %rsi
+; WIN64: .seh_pushreg 6
+; WIN64: subq $24, %rsp
+; WIN64: .seh_stackalloc 24
+; WIN64: .seh_endprologue
+; WIN64: addq $24, %rsp
+; WIN64: popq %rsi
+; WIN64: ret
+; WIN64: .seh_endproc
+
+
+; Check emission of eh handler and handler data
+declare i32 @_d_eh_personality(i32, i32, i64, i8*, i8*)
+declare void @_d_eh_resume_unwind(i8*)
+
+declare i32 @bar()
+
+define i32 @foo4() #0 {
+entry:
+ %step = alloca i32, align 4
+ store i32 0, i32* %step
+ %tmp = load i32* %step
+
+ %tmp1 = invoke i32 @bar()
+ to label %finally unwind label %landingpad
+
+finally:
+ store i32 1, i32* %step
+ br label %endtryfinally
+
+landingpad:
+ %landing_pad = landingpad { i8*, i32 } personality i32 (i32, i32, i64, i8*, i8*)* @_d_eh_personality
+ cleanup
+ %tmp3 = extractvalue { i8*, i32 } %landing_pad, 0
+ store i32 2, i32* %step
+ call void @_d_eh_resume_unwind(i8* %tmp3)
+ unreachable
+
+endtryfinally:
+ %tmp10 = load i32* %step
+ ret i32 %tmp10
+}
+; WIN64: .seh_proc foo4
+; WIN64: .seh_handler _d_eh_personality, @unwind, @except
+; WIN64: subq $56, %rsp
+; WIN64: .seh_stackalloc 56
+; WIN64: .seh_endprologue
+; WIN64: addq $56, %rsp
+; WIN64: ret
+; WIN64: .seh_handlerdata
+; WIN64: .seh_endproc
--
1.8.0.msysgit.0
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