[analyzer] Consolidate constant evaluation logic in SValBuilder.

Previously, this was scattered across Environment (literal expressions),
ExprEngine (default arguments), and RegionStore (global constants). The
former special-cased several kinds of simple constant expressions, while
the latter two deferred to the AST's constant evaluator.

Now, these are all unified as SValBuilder::getConstantVal(). To keep
Environment fast, the special cases for simple constant expressions have
been left in, but the main benefits are that (a) unusual constants like
ObjCStringLiterals now work as default arguments and global constant
initializers, and (b) we're not duplicating code between ExprEngine and
RegionStore.

This actually caught a bug in our test suite, which is awesome: we stop
tracking allocated memory if it's passed as an argument along with some
kind of callback, but not if the callback is 0. We were testing this in
a case where the callback parameter had a default value, but that value
was 0. After this change, the analyzer now (correctly) flags that as a
leak!

<rdar://problem/13773117>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180894 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 35 deletions

diff --git a/lib/StaticAnalyzer/Core/Environment.cpp b/lib/StaticAnalyzer/Core/Environment.cpp
index fe352aa8b4..7b133f6bf6 100644
--- a/lib/StaticAnalyzer/Core/Environment.cpp
+++ b/lib/StaticAnalyzer/Core/Environment.cpp
@@ -80,43 +80,17 @@ SVal Environment::getSVal(const EnvironmentEntry &Entry,
     llvm_unreachable("Should have been handled by ignoreTransparentExprs");
 
   case Stmt::AddrLabelExprClass:
-    return svalBuilder.makeLoc(cast<AddrLabelExpr>(S));
-
-  case Stmt::CharacterLiteralClass: {
-    const CharacterLiteral *C = cast<CharacterLiteral>(S);
-    return svalBuilder.makeIntVal(C->getValue(), C->getType());
-  }
-
+  case Stmt::CharacterLiteralClass:
   case Stmt::CXXBoolLiteralExprClass:
-    return svalBuilder.makeBoolVal(cast<CXXBoolLiteralExpr>(S));
-
   case Stmt::CXXScalarValueInitExprClass:
-  case Stmt::ImplicitValueInitExprClass: {
-    QualType Ty = cast<Expr>(S)->getType();
-    return svalBuilder.makeZeroVal(Ty);
-  }
-
+  case Stmt::ImplicitValueInitExprClass:
   case Stmt::IntegerLiteralClass:
-    return svalBuilder.makeIntVal(cast<IntegerLiteral>(S));
-
   case Stmt::ObjCBoolLiteralExprClass:
-    return svalBuilder.makeBoolVal(cast<ObjCBoolLiteralExpr>(S));
-
-  // For special C0xx nullptr case, make a null pointer SVal.
   case Stmt::CXXNullPtrLiteralExprClass:
-    return svalBuilder.makeNull();
-
-  case Stmt::ObjCStringLiteralClass: {
-    MemRegionManager &MRMgr = svalBuilder.getRegionManager();
-    const ObjCStringLiteral *SL = cast<ObjCStringLiteral>(S);
-    return svalBuilder.makeLoc(MRMgr.getObjCStringRegion(SL));
-  }
-
-  case Stmt::StringLiteralClass: {
-    MemRegionManager &MRMgr = svalBuilder.getRegionManager();
-    const StringLiteral *SL = cast<StringLiteral>(S);
-    return svalBuilder.makeLoc(MRMgr.getStringRegion(SL));
-  }
+  case Stmt::ObjCStringLiteralClass:
+  case Stmt::StringLiteralClass:
+    // Known constants; defer to SValBuilder.
+    return svalBuilder.getConstantVal(cast<Expr>(S)).getValue();
 
   case Stmt::ReturnStmtClass: {
     const ReturnStmt *RS = cast<ReturnStmt>(S);
@@ -127,10 +101,8 @@ SVal Environment::getSVal(const EnvironmentEntry &Entry,
     
   // Handle all other Stmt* using a lookup.
   default:
-    break;
+    return lookupExpr(EnvironmentEntry(S, LCtx));
   }
-  
-  return lookupExpr(EnvironmentEntry(S, LCtx));
 }
 
 Environment EnvironmentManager::bindExpr(Environment Env,