Track in the AST whether the operand to a UnaryOperator can overflow and then use that logic when evaluating constant expressions and emitting codegen.
llvm-svn: 322074
diff --git a/clang/lib/Analysis/BodyFarm.cpp b/clang/lib/Analysis/BodyFarm.cpp
index 89ca848..492d01f 100644
--- a/clang/lib/Analysis/BodyFarm.cpp
+++ b/clang/lib/Analysis/BodyFarm.cpp
@@ -149,7 +149,8 @@
UnaryOperator *ASTMaker::makeDereference(const Expr *Arg, QualType Ty) {
return new (C) UnaryOperator(const_cast<Expr*>(Arg), UO_Deref, Ty,
- VK_LValue, OK_Ordinary, SourceLocation());
+ VK_LValue, OK_Ordinary, SourceLocation(),
+ /*CanOverflow*/ false);
}
ImplicitCastExpr *ASTMaker::makeLvalueToRvalue(const Expr *Arg, QualType Ty) {
@@ -441,7 +442,8 @@
/* opc=*/ UO_LNot,
/* QualType=*/ C.IntTy,
/* ExprValueKind=*/ VK_RValue,
- /* ExprObjectKind=*/ OK_Ordinary, SourceLocation());
+ /* ExprObjectKind=*/ OK_Ordinary, SourceLocation(),
+ /* CanOverflow*/ false);
// Create assignment.
BinaryOperator *FlagAssignment = M.makeAssignment(
@@ -505,7 +507,8 @@
// (2) Create the assignment to the predicate.
Expr *DoneValue =
new (C) UnaryOperator(M.makeIntegerLiteral(0, C.LongTy), UO_Not, C.LongTy,
- VK_RValue, OK_Ordinary, SourceLocation());
+ VK_RValue, OK_Ordinary, SourceLocation(),
+ /*CanOverflow*/false);
BinaryOperator *B =
M.makeAssignment(