Implement support for -fwrapv, rdar://7221421
As part of this, pull together trapv handling into the same enum.
This also add support for NSW multiplies.
This also makes PCH disagreement on overflow behavior silent, since it
really doesn't matter except for warnings and codegen (no macros get
defined etc).
llvm-svn: 106956
diff --git a/clang/lib/Frontend/PCHReader.cpp b/clang/lib/Frontend/PCHReader.cpp
index 5bd3c04..c220e26 100644
--- a/clang/lib/Frontend/PCHReader.cpp
+++ b/clang/lib/Frontend/PCHReader.cpp
@@ -93,7 +93,7 @@
PARSE_LANGOPT_IMPORTANT(Blocks, diag::warn_pch_blocks);
PARSE_LANGOPT_BENIGN(EmitAllDecls);
PARSE_LANGOPT_IMPORTANT(MathErrno, diag::warn_pch_math_errno);
- PARSE_LANGOPT_IMPORTANT(OverflowChecking, diag::warn_pch_overflow_checking);
+ PARSE_LANGOPT_BENIGN(getSignedOverflowBehavior());
PARSE_LANGOPT_IMPORTANT(HeinousExtensions,
diag::warn_pch_heinous_extensions);
// FIXME: Most of the options below are benign if the macro wasn't
@@ -1915,7 +1915,8 @@
PARSE_LANGOPT(Blocks);
PARSE_LANGOPT(EmitAllDecls);
PARSE_LANGOPT(MathErrno);
- PARSE_LANGOPT(OverflowChecking);
+ LangOpts.setSignedOverflowBehavior((LangOptions::SignedOverflowBehaviorTy)
+ Record[Idx++]);
PARSE_LANGOPT(HeinousExtensions);
PARSE_LANGOPT(Optimize);
PARSE_LANGOPT(OptimizeSize);
@@ -1926,13 +1927,10 @@
PARSE_LANGOPT(AccessControl);
PARSE_LANGOPT(CharIsSigned);
PARSE_LANGOPT(ShortWChar);
- LangOpts.setGCMode((LangOptions::GCMode)Record[Idx]);
- ++Idx;
- LangOpts.setVisibilityMode((LangOptions::VisibilityMode)Record[Idx]);
- ++Idx;
+ LangOpts.setGCMode((LangOptions::GCMode)Record[Idx++]);
+ LangOpts.setVisibilityMode((LangOptions::VisibilityMode)Record[Idx++]);
LangOpts.setStackProtectorMode((LangOptions::StackProtectorMode)
- Record[Idx]);
- ++Idx;
+ Record[Idx++]);
PARSE_LANGOPT(InstantiationDepth);
PARSE_LANGOPT(OpenCL);
PARSE_LANGOPT(CatchUndefined);