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Debug Info: Support for DW_AT_export_symbols for anonymous structs 

This implements the DWARF 5 feature described in:

http://dwarfstd.org/ShowIssue.php?issue=141212.1

To support recognizing anonymous structs:

  struct A {
    struct { // Anonymous struct
        int y;
    };
  } a;

This patch adds support in CGDebugInfo::CreateLimitedType(...) for this new flag and an accompanying test to verify this feature.

Differential Revision: https://reviews.llvm.org/D66667

llvm-svn: 370107
This commit is contained in:
Shafik Yaghmour 2019-08-27 20:17:35 +00:00
parent 0c01d92051
commit 528f5da6d8
2 changed files with 17 additions and 1 deletions
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7
clang/lib/CodeGen/CGDebugInfo.cpp
View File

@ -3121,7 +3121,8 @@ llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
SmallString<256> Identifier = getTypeIdentifier(Ty, CGM, TheCU);
// Explicitly record the calling convention for C++ records.
// Explicitly record the calling convention and export symbols for C++
// records.
auto Flags = llvm::DINode::FlagZero;
if (auto CXXRD = dyn_cast<CXXRecordDecl>(RD)) {
if (CGM.getCXXABI().getRecordArgABI(CXXRD) == CGCXXABI::RAA_Indirect)
@ -3132,6 +3133,10 @@ llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
// Record if a C++ record is non-trivial type.
if (!CXXRD->isTrivial())
Flags |= llvm::DINode::FlagNonTrivial;
// Record exports it symbols to the containing structure.
if (CXXRD->isAnonymousStructOrUnion())
Flags |= llvm::DINode::FlagExportSymbols;
}
llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(

11
clang/test/CodeGenCXX/debug-info-export_symbols.cpp Normal file
View File

@ -0,0 +1,11 @@
// RUN: %clang_cc1 -emit-llvm -debug-info-kind=standalone -triple %itanium_abi_triple %s -o - | FileCheck %s
// CHECK: [[SCOPE:![0-9]+]] = distinct !DICompositeType({{.*}}flags: DIFlagTypePassByValue
// CHECK: !DICompositeType(tag: DW_TAG_structure_type, scope: [[SCOPE]]
// CHECK-SAME: DIFlagExportSymbols | DIFlagTypePassByValue
struct A {
// Anonymous class exports its symbols into A
struct {
int y;
};
} a;