[cfe-commits] r107675 - in /cfe/trunk: include/clang/AST/Stmt.h lib/AST/Stmt.cpp
Tom Care
tcare at apple.com
Tue Jul 6 10:28:49 PDT 2010
Author: tcare
Date: Tue Jul 6 12:28:49 2010
New Revision: 107675
URL: http://llvm.org/viewvc/llvm-project?rev=107675&view=rev
Log:
Added several helper functions to Stmt to recursively check for different elements (macros, enum constants, etc).
Modified:
cfe/trunk/include/clang/AST/Stmt.h
cfe/trunk/lib/AST/Stmt.cpp
Modified: cfe/trunk/include/clang/AST/Stmt.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/Stmt.h?rev=107675&r1=107674&r2=107675&view=diff
==============================================================================
--- cfe/trunk/include/clang/AST/Stmt.h (original)
+++ cfe/trunk/include/clang/AST/Stmt.h Tue Jul 6 12:28:49 2010
@@ -253,6 +253,25 @@
/// within CFGs.
bool hasImplicitControlFlow() const;
+ /// contains* - Useful recursive methods to see if a statement contains an
+ /// element somewhere. Used in static analysis to reduce false positives.
+ static bool containsMacro(const Stmt *S);
+ static bool containsEnum(const Stmt *S);
+ static bool containsZeroConstant(const Stmt *S);
+ static bool containsOneConstant(const Stmt *S);
+ template <class T> static bool containsStmt(const Stmt *S) {
+ if (isa<T>(S))
+ return true;
+
+ for (Stmt::const_child_iterator I = S->child_begin(); I != S->child_end(); ++I)
+ if (const Stmt *child = *I)
+ if (containsStmt<T>(child))
+ return true;
+
+ return false;
+ }
+
+
/// Child Iterators: All subclasses must implement child_begin and child_end
/// to permit easy iteration over the substatements/subexpessions of an
/// AST node. This permits easy iteration over all nodes in the AST.
Modified: cfe/trunk/lib/AST/Stmt.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/Stmt.cpp?rev=107675&r1=107674&r2=107675&view=diff
==============================================================================
--- cfe/trunk/lib/AST/Stmt.cpp (original)
+++ cfe/trunk/lib/AST/Stmt.cpp Tue Jul 6 12:28:49 2010
@@ -127,6 +127,72 @@
}
}
+// Recursively find any substatements containing macros
+bool Stmt::containsMacro(const Stmt *S) {
+ if (S->getLocStart().isMacroID())
+ return true;
+
+ if (S->getLocEnd().isMacroID())
+ return true;
+
+ for (Stmt::const_child_iterator I = S->child_begin(); I != S->child_end(); ++I)
+ if (const Stmt *child = *I)
+ if (containsMacro(child))
+ return true;
+
+ return false;
+}
+
+// Recursively find any substatements containing enum constants
+bool Stmt::containsEnum(const Stmt *S) {
+ const DeclRefExpr *DR = dyn_cast<DeclRefExpr>(S);
+
+ if (DR && isa<EnumConstantDecl>(DR->getDecl()))
+ return true;
+
+ for (Stmt::const_child_iterator I = S->child_begin(); I != S->child_end(); ++I)
+ if (const Stmt *child = *I)
+ if (containsEnum(child))
+ return true;
+
+ return false;
+}
+
+bool Stmt::containsZeroConstant(const Stmt *S) {
+ const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(S);
+ if (IL && IL->getValue() == 0)
+ return true;
+
+ const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(S);
+ if (FL && FL->getValue().isZero())
+ return true;
+
+ for (Stmt::const_child_iterator I = S->child_begin(); I != S->child_end(); ++I)
+ if (const Stmt *child = *I)
+ if (containsZeroConstant(child))
+ return true;
+
+ return false;
+}
+
+bool Stmt::containsOneConstant(const Stmt *S) {
+ const IntegerLiteral *IL = dyn_cast<IntegerLiteral>(S);
+ if (IL && IL->getValue() == 1)
+ return true;
+
+ const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(S);
+ const llvm::APFloat one(1.0);
+ if (FL && FL->getValue().compare(one) == llvm::APFloat::cmpEqual)
+ return true;
+
+ for (Stmt::const_child_iterator I = S->child_begin(); I != S->child_end(); ++I)
+ if (const Stmt *child = *I)
+ if (containsOneConstant(child))
+ return true;
+
+ return false;
+}
+
Expr *AsmStmt::getOutputExpr(unsigned i) {
return cast<Expr>(Exprs[i]);
}
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