Insert denominator zero checks for NaCl

This IR pass for ARM inserts a comparison and a branch to trap if the
denominator of a DIV or REM instruction is zero.  This makes ARM fault
identically to x86 in this case.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=2833
R=eliben@chromium.org

Review URL: https://codereview.chromium.org/14607004

2 files changed, 2 insertions, 0 deletions

diff --git a/include/llvm/InitializePasses.h b/include/llvm/InitializePasses.h
index 9bcc8bf2a0..1f81c9770e 100644
--- a/include/llvm/InitializePasses.h
+++ b/include/llvm/InitializePasses.h
@@ -286,6 +286,7 @@ void initializeExpandTlsPass(PassRegistry&);
 void initializeExpandVarArgsPass(PassRegistry&);
 void initializeFlattenGlobalsPass(PassRegistry&);
 void initializeGlobalCleanupPass(PassRegistry&);
+void initializeInsertDivideCheckPass(PassRegistry&);
 void initializeNaClCcRewritePass(PassRegistry&);
 void initializePNaClABIVerifyModulePass(PassRegistry&);
 void initializePNaClABIVerifyFunctionsPass(PassRegistry&);
diff --git a/include/llvm/Transforms/NaCl.h b/include/llvm/Transforms/NaCl.h
index ba765c1c21..edd641e901 100644
--- a/include/llvm/Transforms/NaCl.h
+++ b/include/llvm/Transforms/NaCl.h
@@ -30,6 +30,7 @@ ModulePass *createFlattenGlobalsPass();
 ModulePass *createGlobalCleanupPass();
 ModulePass *createResolveAliasesPass();
 ModulePass *createStripMetadataPass();
+FunctionPass *createInsertDivideCheckPass();
 
 Instruction *PhiSafeInsertPt(Use *U);
 void PhiSafeReplaceUses(Use *U, Value *NewVal);