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[SEH] Remember to emit the last invoke range for SEH

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This wasn't very observable in execution tests, because usually there is
an invoke in the catchpad that unwinds the the catchendpad but never
actually throws.

llvm-svn: 249898
This commit is contained in:
Reid Kleckner 2015-10-09 20:39:39 +00:00
parent bb78834ba9
commit c980ffe7e2
4 changed files with 77 additions and 50 deletions
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76
lib/CodeGen/AsmPrinter/WinException.cpp
View File

@ -418,7 +418,7 @@ invoke_ranges(WinEHFuncInfo &EHInfo, const MachineBasicBlock &MBB) {
/// imagerel32 LabelStart;
/// imagerel32 LabelEnd;
/// imagerel32 FilterOrFinally; // One means catch-all.
/// imagerel32 LabelLPad; // Zero means __finally.
/// imagerel32 ExceptOrNull; // Zero means __finally.
/// } Entries[NumEntries];
/// };
void WinException::emitCSpecificHandlerTable(const MachineFunction *MF) {
@ -469,39 +469,20 @@ void WinException::emitCSpecificHandlerTable(const MachineFunction *MF) {
// If this invoke ends a previous one, emit all the actions for this
// state.
if (LastEHState != -1) {
assert(LastBeginLabel && LastEndLabel);
for (int State = LastEHState; State != -1;) {
SEHUnwindMapEntry &UME = FuncInfo.SEHUnwindMap[State];
const MCExpr *FilterOrFinally;
const MCExpr *ExceptOrNull;
auto *Handler = UME.Handler.get<MachineBasicBlock *>();
if (UME.IsFinally) {
FilterOrFinally =
create32bitRef(getMCSymbolForMBBOrGV(Asm, Handler));
ExceptOrNull = MCConstantExpr::create(0, Ctx);
} else {
// For an except, the filter can be 1 (catch-all) or a function
// label.
FilterOrFinally = UME.Filter ? create32bitRef(UME.Filter)
: MCConstantExpr::create(1, Ctx);
ExceptOrNull = create32bitRef(Handler->getSymbol());
}
OS.EmitValue(getLabelPlusOne(LastBeginLabel), 4);
OS.EmitValue(getLabelPlusOne(LastEndLabel), 4);
OS.EmitValue(FilterOrFinally, 4);
OS.EmitValue(ExceptOrNull, 4);
State = UME.ToState;
}
}
if (LastEHState != -1)
emitSEHActionsForRange(FuncInfo, LastBeginLabel, LastEndLabel,
LastEHState);
LastBeginLabel = I.BeginLabel;
LastEndLabel = I.EndLabel;
LastEHState = I.State;
}
}
if (LastEndLabel)
emitSEHActionsForRange(FuncInfo, LastBeginLabel, LastEndLabel,
LastEHState);
OS.EmitLabel(TableEnd);
return;
}
@ -589,6 +570,45 @@ void WinException::emitCSpecificHandlerTable(const MachineFunction *MF) {
}
}
void WinException::emitSEHActionsForRange(WinEHFuncInfo &FuncInfo,
MCSymbol *BeginLabel,
MCSymbol *EndLabel, int State) {
auto &OS = *Asm->OutStreamer;
MCContext &Ctx = Asm->OutContext;
assert(BeginLabel && EndLabel);
while (State != -1) {
// struct Entry {
// imagerel32 LabelStart;
// imagerel32 LabelEnd;
// imagerel32 FilterOrFinally; // One means catch-all.
// imagerel32 ExceptOrNull; // Zero means __finally.
// };
SEHUnwindMapEntry &UME = FuncInfo.SEHUnwindMap[State];
const MCExpr *FilterOrFinally;
const MCExpr *ExceptOrNull;
auto *Handler = UME.Handler.get<MachineBasicBlock *>();
if (UME.IsFinally) {
FilterOrFinally = create32bitRef(getMCSymbolForMBBOrGV(Asm, Handler));
ExceptOrNull = MCConstantExpr::create(0, Ctx);
} else {
// For an except, the filter can be 1 (catch-all) or a function
// label.
FilterOrFinally = UME.Filter ? create32bitRef(UME.Filter)
: MCConstantExpr::create(1, Ctx);
ExceptOrNull = create32bitRef(Handler->getSymbol());
}
OS.EmitValue(getLabelPlusOne(BeginLabel), 4);
OS.EmitValue(getLabelPlusOne(EndLabel), 4);
OS.EmitValue(FilterOrFinally, 4);
OS.EmitValue(ExceptOrNull, 4);
assert(UME.ToState < State && "states should decrease");
State = UME.ToState;
}
}
void WinException::emitCXXFrameHandler3Table(const MachineFunction *MF) {
const Function *F = MF->getFunction();
auto &OS = *Asm->OutStreamer;

3
lib/CodeGen/AsmPrinter/WinException.h
View File

@ -41,6 +41,9 @@ class LLVM_LIBRARY_VISIBILITY WinException : public EHStreamer {
void emitCSpecificHandlerTable(const MachineFunction *MF);
void emitSEHActionsForRange(WinEHFuncInfo &FuncInfo, MCSymbol *BeginLabel,
MCSymbol *EndLabel, int State);
/// Emit the EH table data for 32-bit and 64-bit functions using
/// the __CxxFrameHandler3 personality.
void emitCXXFrameHandler3Table(const MachineFunction *MF);

36
test/CodeGen/X86/seh-catch-all.ll
View File

@ -2,6 +2,7 @@
@str = linkonce_odr unnamed_addr constant [27 x i8] c"GetExceptionCode(): 0x%lx\0A\00", align 1
declare i32 @llvm.eh.exceptioncode(token)
declare i32 @__C_specific_handler(...)
declare void @crash()
declare i32 @printf(i8* nocapture readonly, ...) nounwind
@ -11,20 +12,20 @@ entry:
invoke void @crash()
to label %__try.cont unwind label %lpad
lpad:
%0 = landingpad { i8*, i32 }
catch i8* null
%1 = extractvalue { i8*, i32 } %0, 0
%2 = ptrtoint i8* %1 to i64
%3 = trunc i64 %2 to i32
call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @str, i64 0, i64 0), i32 %3)
br label %__try.cont
__try.cont:
ret i32 0
eh.resume:
resume { i8*, i32 } %0
lpad:
%p = catchpad [i8* null, i32 64, i8* null]
to label %catchall unwind label %endpad
catchall:
%code = call i32 @llvm.eh.exceptioncode(token %p)
call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @str, i64 0, i64 0), i32 %code)
catchret %p to label %__try.cont
endpad:
catchendpad unwind to caller
}
; Check that we can get the exception code from eax to the printf.
@ -32,18 +33,17 @@ eh.resume:
; CHECK-LABEL: main:
; CHECK: callq crash
; CHECK: retq
; CHECK: # Block address taken
; CHECK: .LBB0_2: # %lpad
; CHECK: # %catchall
; CHECK: leaq str(%rip), %rcx
; CHECK: movl %eax, %edx
; CHECK: callq printf
; CHECK: .seh_handlerdata
; CHECK-NEXT: .text
; CHECK-NEXT: .Ltmp{{[0-9]+}}
; CHECK-NEXT: .seh_endproc
; CHECK-NEXT: .section .xdata,"dr"
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long (.Llsda_end0-.Llsda_begin0)/16
; CHECK-NEXT: .Llsda_begin0:
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}@IMGREL
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}@IMGREL+1
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}@IMGREL
; CHECK-NEXT: .long .LBB0_2@IMGREL
; CHECK-NEXT: .Llsda_end0:

12
test/CodeGen/X86/seh-catchpad.ll
View File

@ -130,22 +130,26 @@ ehcleanup.end: ; preds = %ehcleanup
; CHECK: .seh_handlerdata
; CHECK-NEXT: .long (.Llsda_end0-.Llsda_begin0)/16
; CHECK-NEXT: .Llsda_begin0:
; CHECK-NEXT: .long .Ltmp0@IMGREL
; CHECK-NEXT: .long .Ltmp0@IMGREL+1
; CHECK-NEXT: .long .Ltmp1@IMGREL+1
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long .LBB1_[[except1bb]]@IMGREL
; CHECK-NEXT: .long .Ltmp0@IMGREL
; CHECK-NEXT: .long .Ltmp0@IMGREL+1
; CHECK-NEXT: .long .Ltmp1@IMGREL+1
; CHECK-NEXT: .long "?filt$0@0@main@@"@IMGREL
; CHECK-NEXT: .long .LBB1_[[except2bb]]@IMGREL
; CHECK-NEXT: .long .Ltmp2@IMGREL
; CHECK-NEXT: .long .Ltmp2@IMGREL+1
; CHECK-NEXT: .long .Ltmp3@IMGREL+1
; CHECK-NEXT: .long "?dtor$[[finbb:[0-9]+]]@?0?main@4HA"@IMGREL
; CHECK-NEXT: .long 0
; CHECK-NEXT: .long .Ltmp2@IMGREL
; CHECK-NEXT: .long .Ltmp2@IMGREL+1
; CHECK-NEXT: .long .Ltmp3@IMGREL+1
; CHECK-NEXT: .long "?filt$0@0@main@@"@IMGREL
; CHECK-NEXT: .long .LBB1_6@IMGREL
; CHECK-NEXT: .long .Ltmp6@IMGREL+1
; CHECK-NEXT: .long .Ltmp5@IMGREL+1
; CHECK-NEXT: .long "?filt$0@0@main@@"@IMGREL
; CHECK-NEXT: .long .LBB1_6@IMGREL
; CHECK-NEXT: .Llsda_end0:
; CHECK: .text