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An option to selectively enable part of ARM EHABI support.

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This change adds an new option --arm-enable-ehabi-descriptors that
enables emitting unwinding descriptors. This provides a mode with a
working backtrace() without the (currently broken) exception support.

llvm-svn: 148800
This commit is contained in:
Evgeniy Stepanov 2012-01-24 13:05:33 +00:00
parent 06164017c0
commit a0474f4619
2 changed files with 15 additions and 5 deletions
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19
lib/CodeGen/AsmPrinter/ARMException.cpp
View File

@ -29,6 +29,7 @@
#include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h" #include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Dwarf.h" #include "llvm/Support/Dwarf.h"
#include "llvm/Support/FormattedStream.h" #include "llvm/Support/FormattedStream.h"
#include "llvm/ADT/SmallString.h" #include "llvm/ADT/SmallString.h"
@ -36,6 +37,12 @@
#include "llvm/ADT/Twine.h" #include "llvm/ADT/Twine.h"
using namespace llvm; using namespace llvm;
cl::opt<bool>
EnableARMEHABIDescriptors("arm-enable-ehabi-descriptors", cl::Hidden,
cl::desc("Generate ARM EHABI tables with unwinding descriptors"),
cl::init(false));
ARMException::ARMException(AsmPrinter *A) ARMException::ARMException(AsmPrinter *A)
: DwarfException(A), : DwarfException(A),
shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false) shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
@ -72,13 +79,15 @@ void ARMException::EndFunction() {
Asm->OutStreamer.EmitPersonality(PerSym); Asm->OutStreamer.EmitPersonality(PerSym);
} }
// Map all labels and get rid of any dead landing pads. if (EnableARMEHABIDescriptors) {
MMI->TidyLandingPads(); // Map all labels and get rid of any dead landing pads.
MMI->TidyLandingPads();
Asm->OutStreamer.EmitHandlerData(); Asm->OutStreamer.EmitHandlerData();
// Emit actual exception table // Emit actual exception table
EmitExceptionTable(); EmitExceptionTable();
}
} }
Asm->OutStreamer.EmitFnEnd(); Asm->OutStreamer.EmitFnEnd();

1
test/CodeGen/ARM/ehabi-unwind.ll
View File

@ -2,6 +2,7 @@
; unfamiliar instructions. ; unfamiliar instructions.
; RUN: llc < %s -mtriple=thumbv7 -arm-enable-ehabi -disable-fp-elim ; RUN: llc < %s -mtriple=thumbv7 -arm-enable-ehabi -disable-fp-elim
; RUN: llc < %s -mtriple=thumbv7 -arm-enable-ehabi ; RUN: llc < %s -mtriple=thumbv7 -arm-enable-ehabi
; RUN: llc < %s -mtriple=thumbv7 -arm-enable-ehabi -arm-enable-ehabi-descriptors
define void @_Z1fv() nounwind { define void @_Z1fv() nounwind {
entry: entry: