[llvm-branch-commits] [llvm-branch] r95237 - /llvm/branches/Apple/Zoidberg/lib/CodeGen/DwarfEHPrepare.cpp
Jim Grosbach
grosbach at apple.com
Wed Feb 3 11:19:14 PST 2010
Author: grosbach
Date: Wed Feb 3 13:19:14 2010
New Revision: 95237
URL: http://llvm.org/viewvc/llvm-project?rev=95237&view=rev
Log:
merge 94046
Modified:
llvm/branches/Apple/Zoidberg/lib/CodeGen/DwarfEHPrepare.cpp
Modified: llvm/branches/Apple/Zoidberg/lib/CodeGen/DwarfEHPrepare.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/Apple/Zoidberg/lib/CodeGen/DwarfEHPrepare.cpp?rev=95237&r1=95236&r2=95237&view=diff
==============================================================================
--- llvm/branches/Apple/Zoidberg/lib/CodeGen/DwarfEHPrepare.cpp (original)
+++ llvm/branches/Apple/Zoidberg/lib/CodeGen/DwarfEHPrepare.cpp Wed Feb 3 13:19:14 2010
@@ -21,6 +21,7 @@
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/PromoteMemToReg.h"
@@ -114,6 +115,9 @@
bool DwarfEHPrepare::NormalizeLandingPads() {
bool Changed = false;
+ const MCAsmInfo *MAI = TLI->getTargetMachine().getMCAsmInfo();
+ bool usingSjLjEH = MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
+
for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I) {
TerminatorInst *TI = I->getTerminator();
if (!isa<InvokeInst>(TI))
@@ -125,9 +129,18 @@
// Check that only invoke unwind edges end at the landing pad.
bool OnlyUnwoundTo = true;
+ bool SwitchOK = usingSjLjEH;
for (pred_iterator PI = pred_begin(LPad), PE = pred_end(LPad);
PI != PE; ++PI) {
TerminatorInst *PT = (*PI)->getTerminator();
+ // The SjLj dispatch block uses a switch instruction. This is effectively
+ // an unwind edge, so we can disregard it here. There will only ever
+ // be one dispatch, however, so if there are multiple switches, one
+ // of them truly is a normal edge, not an unwind edge.
+ if (SwitchOK && isa<SwitchInst>(PT)) {
+ SwitchOK = false;
+ continue;
+ }
if (!isa<InvokeInst>(PT) || LPad == PT->getSuccessor(0)) {
OnlyUnwoundTo = false;
break;
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