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| author | Jordan Rose <jordan_rose@apple.com> | 2014-01-16 18:02:23 +0000 |
|---|---|---|
| committer | Jordan Rose <jordan_rose@apple.com> | 2014-01-16 18:02:23 +0000 |
| commit | 2be02a784828c66d0025fe63a8e84751d6531a37 (patch) | |
| tree | 8f11b2bf927593ab6e4450f5c1a77588d8c00855 /clang/lib/StaticAnalyzer/Core | |
| parent | ef6fed7c84e7e7a03aa26db4b6d96d91e521419c (diff) | |
| download | bcm5719-llvm-2be02a784828c66d0025fe63a8e84751d6531a37.tar.gz bcm5719-llvm-2be02a784828c66d0025fe63a8e84751d6531a37.zip | |
[analyzer] Shitfing a constant value by its bit width is undefined.
Citation: C++11 [expr.shift]p1 (and the equivalent text in C11).
This fixes PR18073, but the right thing to do (as noted in the FIXME) is to
have a real checker for too-large shifts.
llvm-svn: 199405
Diffstat (limited to 'clang/lib/StaticAnalyzer/Core')
| -rw-r--r-- | clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp b/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp index a6c400f3704..8f93cee6263 100644 --- a/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp +++ b/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp @@ -177,7 +177,7 @@ BasicValueFactory::evalAPSInt(BinaryOperator::Opcode Op, uint64_t Amt = V2.getZExtValue(); - if (Amt > V1.getBitWidth()) + if (Amt >= V1.getBitWidth()) return NULL; return &getValue( V1.operator<<( (unsigned) Amt )); @@ -195,7 +195,7 @@ BasicValueFactory::evalAPSInt(BinaryOperator::Opcode Op, uint64_t Amt = V2.getZExtValue(); - if (Amt > V1.getBitWidth()) + if (Amt >= V1.getBitWidth()) return NULL; return &getValue( V1.operator>>( (unsigned) Amt )); |
