Change EmitConstantExpr to allow failure.
IRgen no longer relies on isConstantInitializer, instead we just try
to emit the constant. If that fails then in C we emit an error
unsupported (this occurs when Sema accepted something that it doesn't
know how to fold, and IRgen doesn't know how to emit) and in C++ we
emit a guarded initializer.
This ends up handling a few more cases, because IRgen was actually
able to emit some of the constants Sema accepts but can't Evaluate().
For example, PR3398.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64780 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index ff1437c..b54ee13 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -247,7 +247,12 @@
const std::string &Name);
void UpdateCompletedType(const TagDecl *D);
+
+ /// EmitConstantExpr - Try to emit the given expression as a
+ /// constant; returns 0 if the expression cannot be emitted as a
+ /// constant.
llvm::Constant *EmitConstantExpr(const Expr *E, CodeGenFunction *CGF = 0);
+
llvm::Constant *EmitAnnotateAttr(llvm::GlobalValue *GV,
const AnnotateAttr *AA, unsigned LineNo);