An option to selectively enable parts of ARM EHABI support.
This change adds an new value to the --arm-enable-ehabi option that
disables emitting unwinding descriptors. This mode gives a working
backtrace() without the (currently broken) exception support.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148686 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/ARMException.cpp b/lib/CodeGen/AsmPrinter/ARMException.cpp
index 3f23873..e5a7d05f 100644
--- a/lib/CodeGen/AsmPrinter/ARMException.cpp
+++ b/lib/CodeGen/AsmPrinter/ARMException.cpp
@@ -29,6 +29,7 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/ADT/SmallString.h"
@@ -36,6 +37,18 @@
#include "llvm/ADT/Twine.h"
using namespace llvm;
+cl::opt<ExceptionHandling::ARMEHABIMode>
+EnableARMEHABI("arm-enable-ehabi", cl::Hidden,
+ cl::desc("Generate ARM EHABI tables:"),
+ cl::values(clEnumValN(ExceptionHandling::ARMEHABIDisabled, "no",
+ "Do not generate ARM EHABI tables"),
+ clEnumValN(ExceptionHandling::ARMEHABIUnwind, "unwind",
+ "Emit unwinding instructions, but not descriptors"),
+ clEnumValN(ExceptionHandling::ARMEHABIFull, "full",
+ "Generate full ARM EHABI tables"),
+ clEnumValEnd));
+
+
ARMException::ARMException(AsmPrinter *A)
: DwarfException(A),
shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
@@ -72,13 +85,15 @@
Asm->OutStreamer.EmitPersonality(PerSym);
}
- // Map all labels and get rid of any dead landing pads.
- MMI->TidyLandingPads();
+ if (EnableARMEHABI == ExceptionHandling::ARMEHABIFull) {
+ // Map all labels and get rid of any dead landing pads.
+ MMI->TidyLandingPads();
- Asm->OutStreamer.EmitHandlerData();
+ Asm->OutStreamer.EmitHandlerData();
- // Emit actual exception table
- EmitExceptionTable();
+ // Emit actual exception table
+ EmitExceptionTable();
+ }
}
Asm->OutStreamer.EmitFnEnd();