constexpr irgen: Add irgen support for APValue::Struct, APValue::Union,
APValue::Array and APValue::MemberPointer. All APValue values can now be emitted
as constants.
Add new CGCXXABI entry point for emitting an APValue MemberPointer. The other
entrypoints dealing with constant member pointers are no longer necessary and
will be removed in a later change.
Switch codegen from using EvaluateAsRValue/EvaluateAsLValue to
VarDecl::evaluateValue. This performs caching and deals with the nasty cases in
C++11 where a non-const object's initializer can refer indirectly to
previously-initialized fields within the same object.
Building the intermediate APValue object incurs a measurable performance hit on
pathological testcases with huge initializer lists, so we continue to build IR
directly from the Expr nodes for array and record types outside of C++11.
llvm-svn: 148178
diff --git a/clang/lib/AST/RecordLayoutBuilder.cpp b/clang/lib/AST/RecordLayoutBuilder.cpp
index 5223219..d094461 100644
--- a/clang/lib/AST/RecordLayoutBuilder.cpp
+++ b/clang/lib/AST/RecordLayoutBuilder.cpp
@@ -2153,6 +2153,28 @@
return Entry;
}
+static uint64_t getFieldOffset(const ASTContext &C, const FieldDecl *FD) {
+ const ASTRecordLayout &Layout = C.getASTRecordLayout(FD->getParent());
+ return Layout.getFieldOffset(FD->getFieldIndex());
+}
+
+uint64_t ASTContext::getFieldOffset(const ValueDecl *VD) const {
+ uint64_t OffsetInBits;
+ if (const FieldDecl *FD = dyn_cast<FieldDecl>(VD)) {
+ OffsetInBits = ::getFieldOffset(*this, FD);
+ } else {
+ const IndirectFieldDecl *IFD = cast<IndirectFieldDecl>(VD);
+
+ OffsetInBits = 0;
+ for (IndirectFieldDecl::chain_iterator CI = IFD->chain_begin(),
+ CE = IFD->chain_end();
+ CI != CE; ++CI)
+ OffsetInBits += ::getFieldOffset(*this, cast<FieldDecl>(*CI));
+ }
+
+ return OffsetInBits;
+}
+
/// getObjCLayout - Get or compute information about the layout of the
/// given interface.
///