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6 Commits

Author SHA1 Message Date
Tom Care b9933f365e Added psuedo-constant analysis and integrated it into the false positive reduction stage in IdempotentOperationChecker. 
- Renamed IdempotentOperationChecker::isConstant to isConstantOrPseudoConstant to better reflect the function
- Changed IdempotentOperationChecker::PreVisitBinaryOperator to only run 'CanVary' once on undefined assumptions
- Created new PsuedoConstantAnalysis class and added it to AnalysisContext
- Changed IdempotentOperationChecker to exploit the new analysis
- Updated tests with psuedo-constants
- Added check to IdempotentOperationChecker to see if a Decl is const qualified

llvm-svn: 111426
 2010-08-18 21:17:24 +00:00
Tom Care 29a6250bf0 Added some false positive checking to UnreachableCodeChecker 
- Allowed reporting of dead macros
- Added path walking function to search for false positives in conditional statements
- Updated some affected tests
- Added some false positive test cases

llvm-svn: 109561
 2010-07-27 23:30:21 +00:00
Ted Kremenek 83b598c14f Finesse 'idempotent operations' analyzer issues to include the opcode of the binary operator for clearer error reporting. Also remove the 'Idempotent operation' prefix in messages; it's redundant since the bug type is the same. 
llvm-svn: 109527
 2010-07-27 18:49:08 +00:00
Tom Care 826e6b4023 Improved false positive rate for the idempotent operations checker and moved it into the default path-sensitive analysis options. 
- Added checks for static local variables, self assigned parameters, and truncating/extending self assignments
- Removed command line option (now default with --analyze)
- Updated test cases to pass with idempotent operation warnings

llvm-svn: 108550
 2010-07-16 20:41:41 +00:00
Jordy Rose 61176897ba Pointer comparisons (and pointer-pointer subtraction). Basically filling in SimpleSValuator::EvalBinOpLL(). 
llvm-svn: 106992
 2010-06-28 08:26:15 +00:00
Jordy Rose 895c899142 Adds analyzer support for idempotent and tautological binary operations such as "a*0" and "a+0". This is not very powerful, but does make the analyzer look a little smarter than it actually is. 
llvm-svn: 106402
 2010-06-20 04:56:29 +00:00