diff options
| author | Chris Lattner <sabre@nondot.org> | 2010-06-26 21:25:03 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-06-26 21:25:03 +0000 |
| commit | a4d71455f0d418e16cc0c5c5aa55a3bad3494aee (patch) | |
| tree | efaf0e10486ac58302fe7c2934c325225e1c7c3f /lib/Frontend/CompilerInvocation.cpp | |
| parent | e70ffd631179c15d358838464425e3464cf05a98 (diff) | |
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).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106956 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Frontend/CompilerInvocation.cpp')
| -rw-r--r-- | lib/Frontend/CompilerInvocation.cpp | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp index e7a75a619d..76770ae36c 100644 --- a/lib/Frontend/CompilerInvocation.cpp +++ b/lib/Frontend/CompilerInvocation.cpp @@ -549,8 +549,11 @@ static void LangOptsToArgs(const LangOptions &Opts, Res.push_back("-femit-all-decls"); if (Opts.MathErrno) Res.push_back("-fmath-errno"); - if (Opts.OverflowChecking) - Res.push_back("-ftrapv"); + switch (Opts.getSignedOverflowBehavior()) { + case LangOptions::SOB_Undefined: break; + case LangOptions::SOB_Defined: Res.push_back("-fwrapv"); break; + case LangOptions::SOB_Trapping: Res.push_back("-ftrapv"); break; + } if (Opts.HeinousExtensions) Res.push_back("-fheinous-gnu-extensions"); // Optimize is implicit. @@ -1257,8 +1260,11 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK, if (Args.hasArg(OPT_fvisibility_inlines_hidden)) Opts.InlineVisibilityHidden = 1; - - Opts.OverflowChecking = Args.hasArg(OPT_ftrapv); + + if (Args.hasArg(OPT_ftrapv)) + Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping); + else if (Args.hasArg(OPT_fwrapv)) + Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined); // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs // is specified, or -std is set to a conforming mode. |