From 3ff08a8e76eeb25ceeed2c7461eccd388f996985 Mon Sep 17 00:00:00 2001 From: Tom Care Date: Tue, 6 Jul 2010 21:43:29 +0000 Subject: Added a path-sensitive idempotent operation checker (-analyzer-idempotent-operation). Finds idempotent and/or tautological operations in a path sensitive context, flagging operations that have no effect or a predictable effect. Example: { int a = 1; int b = 5; int c = b / a; // a is 1 on all paths } - New IdempotentOperationChecker class - Moved recursive Stmt functions in r107675 to IdempotentOperationChecker - Minor refactoring of SVal to allow checking for any integer - Added command line option for check - Added basic test cases llvm-svn: 107706 --- clang/lib/Frontend/CompilerInvocation.cpp | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'clang/lib/Frontend/CompilerInvocation.cpp') diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp index c19879f..2520341 100644 --- a/clang/lib/Frontend/CompilerInvocation.cpp +++ b/clang/lib/Frontend/CompilerInvocation.cpp @@ -112,6 +112,8 @@ static void AnalyzerOptsToArgs(const AnalyzerOptions &Opts, Res.push_back("-analyzer-experimental-checks"); if (Opts.EnableExperimentalInternalChecks) Res.push_back("-analyzer-experimental-internal-checks"); + if (Opts.EnableIdempotentOperationChecker) + Res.push_back("-analyzer-idempotent-operation"); } static void CodeGenOptsToArgs(const CodeGenOptions &Opts, @@ -788,6 +790,8 @@ static void ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args, Opts.EnableExperimentalChecks = Args.hasArg(OPT_analyzer_experimental_checks); Opts.EnableExperimentalInternalChecks = Args.hasArg(OPT_analyzer_experimental_internal_checks); + Opts.EnableIdempotentOperationChecker = + Args.hasArg(OPT_analyzer_idempotent_operation); Opts.TrimGraph = Args.hasArg(OPT_trim_egraph); Opts.MaxNodes = Args.getLastArgIntValue(OPT_analyzer_max_nodes, 150000,Diags); Opts.MaxLoop = Args.getLastArgIntValue(OPT_analyzer_max_loop, 3, Diags); -- cgit v1.1