add -fbounds-checking option.
When enabled, clang generates bounds checks for array and pointers dereferences. Work to follow in LLVM's backend.
OK'ed by Chad; thanks for the review.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156431 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index f977f55..19ee428 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -517,7 +517,7 @@
}
void CodeGenFunction::EmitCheck(llvm::Value *Address, unsigned Size) {
- if (!CatchUndefined)
+ if (BoundsChecking <= 0)
return;
// This needs to be to the standard address space.
diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index dfb04b4..5d108be 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/lib/CodeGen/CodeGenFunction.cpp
@@ -41,6 +41,7 @@
CXXVTTValue(0), OutermostConditional(0), TerminateLandingPad(0),
TerminateHandler(0), TrapBB(0) {
+ BoundsChecking = getContext().getLangOpts().BoundsChecking;
CatchUndefined = getContext().getLangOpts().CatchUndefined;
CGM.getCXXABI().getMangleContext().startNewFunction();
}
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index a25b02a..8d48a0b 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -591,6 +591,11 @@
/// we prefer to insert allocas.
llvm::AssertingVH<llvm::Instruction> AllocaInsertPt;
+ /// BoundsChecking - Emit run-time bounds checks. Higher values mean
+ /// potentially higher performance penalties.
+ unsigned char BoundsChecking;
+
+ /// CatchUndefined - Emit run-time checks to catch undefined behaviors.
bool CatchUndefined;
/// In ARC, whether we should autorelease the return value.