[analyzer] Left shifting a negative value is undefined

The analyzer did not return an UndefVal in case a negative value was left
shifted. I also altered the UndefResultChecker to emit a clear warning in this
case.

Differential Revision: https://reviews.llvm.org/D39423

llvm-svn: 316924

diff --git a/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
index 21e8b10..172ce34 100644 (file)
--- a/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
@@ -137,6 +137,10 @@ void UndefResultChecker::checkPostStmt(const BinaryOperator *B,
 
         OS << " greater or equal to the width of type '"
            << B->getLHS()->getType().getAsString() << "'.";
+      } else if (B->getOpcode() == BinaryOperatorKind::BO_Shl &&
+                 C.isNegative(B->getLHS())) {
+        OS << "The result of the left shift is undefined because the left "
+              "operand is negative";
       } else {
         OS << "The result of the '"
            << BinaryOperator::getOpcodeStr(B->getOpcode())

diff --git a/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp b/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp
index ebbace4..ec7a7e9 100644 (file)
--- a/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp
+++ b/clang/lib/StaticAnalyzer/Core/BasicValueFactory.cpp
@@ -225,6 +225,8 @@ BasicValueFactory::evalAPSInt(BinaryOperator::Opcode Op,
       // test these conditions symbolically.
 
       // FIXME: Expand these checks to include all undefined behavior.
+      if (V1.isSigned() && V1.isNegative())
+        return nullptr;
 
       if (V2.isSigned() && V2.isNegative())
         return nullptr;

diff --git a/clang/test/Analysis/bitwise-ops.c b/clang/test/Analysis/bitwise-ops.c
index acef668..fe54658 100644 (file)
--- a/clang/test/Analysis/bitwise-ops.c
+++ b/clang/test/Analysis/bitwise-ops.c
@@ -44,3 +44,10 @@ int testNegativeShift(int a) {
   }
   return 0;
 }
+
+int testNegativeLeftShift(int a) {
+  if (a == -3) {
+    return a << 1; // expected-warning{{The result of the left shift is undefined because the left operand is negative}}
+  }
+  return 0;
+}