https://github.com/Michael137 created
https://github.com/llvm/llvm-project/pull/72234
This patch adds the LLVM-side infrastructure to implement DWARFv5 issue
161118.1: "DW_TAG for C++ static data members".
The clang-side of this patch will simply construct the DIDerivedType with a
different DW_TAG.
>From af4a49c1f468705f2f7226e4244936363c41155e Mon Sep 17 00:00:00 2001
From: Michael Buch <michaelbuc...@gmail.com>
Date: Mon, 6 Nov 2023 11:52:47 +0000
Subject: [PATCH] [llvm][DebugInfo] DWARFv5: static data members declarations
are DW_TAG_variable
This patch adds the LLVM-side infrastructure to implement
DWARFv5 issue 161118.1: "DW_TAG for C++ static data members".
The clang-side of this patch will simply construct the DIDerivedType
with a different DW_TAG.
---
clang/lib/CodeGen/CGDebugInfo.cpp | 3 +-
llvm/include/llvm-c/DebugInfo.h | 6 +-
llvm/include/llvm/IR/DIBuilder.h | 3 +-
llvm/lib/IR/DIBuilder.cpp | 9 +-
llvm/lib/IR/DebugInfo.cpp | 12 +-
llvm/lib/IR/DebugInfoMetadata.cpp | 4 +-
llvm/lib/IR/Verifier.cpp | 1 +
.../dwarf5-debug-info-static-member.ll | 109 ++++++++++++++++++
8 files changed, 129 insertions(+), 18 deletions(-)
create mode 100644
llvm/test/DebugInfo/Generic/dwarf5-debug-info-static-member.ll
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp
b/clang/lib/CodeGen/CGDebugInfo.cpp
index 04ca02cfe858579..b8acef67dee4c7c 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1681,7 +1681,8 @@ CGDebugInfo::CreateRecordStaticField(const VarDecl *Var,
llvm::DIType *RecordTy,
llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
- RecordTy, VName, VUnit, LineNumber, VTy, Flags, /* Val */ nullptr,
Align);
+ RecordTy, VName, VUnit, LineNumber, VTy, Flags, /* Val */ nullptr,
+ DW_TAG_member, Align);
StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
StaticDataMemberDefinitionsToEmit.push_back(Var->getCanonicalDecl());
return GV;
diff --git a/llvm/include/llvm-c/DebugInfo.h b/llvm/include/llvm-c/DebugInfo.h
index 5924294708cc354..61659d514b520e5 100644
--- a/llvm/include/llvm-c/DebugInfo.h
+++ b/llvm/include/llvm-c/DebugInfo.h
@@ -785,14 +785,14 @@ LLVMMetadataRef LLVMDIBuilderCreateMemberType(
* \param Type Type of the static member.
* \param Flags Flags to encode member attribute, e.g. private.
* \param ConstantVal Const initializer of the member.
+ * \param Tag DWARF tag of the static member.
* \param AlignInBits Member alignment.
*/
-LLVMMetadataRef
-LLVMDIBuilderCreateStaticMemberType(
+LLVMMetadataRef LLVMDIBuilderCreateStaticMemberType(
LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
LLVMMetadataRef Type, LLVMDIFlags Flags, LLVMValueRef ConstantVal,
- uint32_t AlignInBits);
+ unsigned Tag, uint32_t AlignInBits);
/**
* Create debugging information entry for a pointer to member.
diff --git a/llvm/include/llvm/IR/DIBuilder.h b/llvm/include/llvm/IR/DIBuilder.h
index ecd6dd7b0a4f822..2be133e85e8c1e4 100644
--- a/llvm/include/llvm/IR/DIBuilder.h
+++ b/llvm/include/llvm/IR/DIBuilder.h
@@ -376,11 +376,12 @@ namespace llvm {
/// \param Ty Type of the static member.
/// \param Flags Flags to encode member attribute, e.g. private.
/// \param Val Const initializer of the member.
+ /// \param Tag DWARF tag of the static member.
/// \param AlignInBits Member alignment.
DIDerivedType *createStaticMemberType(DIScope *Scope, StringRef Name,
DIFile *File, unsigned LineNo,
DIType *Ty, DINode::DIFlags Flags,
- Constant *Val,
+ Constant *Val, unsigned Tag,
uint32_t AlignInBits = 0);
/// Create debugging information entry for Objective-C
diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
index 1ce8c17f8a880f6..58a7e07d9b58d86 100644
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -405,12 +405,11 @@ DIDerivedType *
DIBuilder::createStaticMemberType(DIScope *Scope, StringRef Name, DIFile *File,
unsigned LineNumber, DIType *Ty,
DINode::DIFlags Flags, llvm::Constant *Val,
- uint32_t AlignInBits) {
+ unsigned Tag, uint32_t AlignInBits) {
Flags |= DINode::FlagStaticMember;
- return DIDerivedType::get(VMContext, dwarf::DW_TAG_member, Name, File,
- LineNumber, getNonCompileUnitScope(Scope), Ty, 0,
- AlignInBits, 0, std::nullopt, Flags,
- getConstantOrNull(Val));
+ return DIDerivedType::get(VMContext, Tag, Name, File, LineNumber,
+ getNonCompileUnitScope(Scope), Ty, 0, AlignInBits,
+ 0, std::nullopt, Flags, getConstantOrNull(Val));
}
DIDerivedType *
diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 390a27c4bc0c4dd..0f3590ec66bf2b9 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -1315,17 +1315,15 @@ LLVMDIBuilderCreateUnspecifiedType(LLVMDIBuilderRef
Builder, const char *Name,
return wrap(unwrap(Builder)->createUnspecifiedType({Name, NameLen}));
}
-LLVMMetadataRef
-LLVMDIBuilderCreateStaticMemberType(
+LLVMMetadataRef LLVMDIBuilderCreateStaticMemberType(
LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
LLVMMetadataRef Type, LLVMDIFlags Flags, LLVMValueRef ConstantVal,
- uint32_t AlignInBits) {
+ unsigned Tag, uint32_t AlignInBits) {
return wrap(unwrap(Builder)->createStaticMemberType(
- unwrapDI<DIScope>(Scope), {Name, NameLen},
- unwrapDI<DIFile>(File), LineNumber, unwrapDI<DIType>(Type),
- map_from_llvmDIFlags(Flags), unwrap<Constant>(ConstantVal),
- AlignInBits));
+ unwrapDI<DIScope>(Scope), {Name, NameLen}, unwrapDI<DIFile>(File),
+ LineNumber, unwrapDI<DIType>(Type), map_from_llvmDIFlags(Flags),
+ unwrap<Constant>(ConstantVal), Tag, AlignInBits));
}
LLVMMetadataRef
diff --git a/llvm/lib/IR/DebugInfoMetadata.cpp
b/llvm/lib/IR/DebugInfoMetadata.cpp
index 0e14ec90b51f1fb..943826c6ac89df9 100644
--- a/llvm/lib/IR/DebugInfoMetadata.cpp
+++ b/llvm/lib/IR/DebugInfoMetadata.cpp
@@ -711,7 +711,9 @@ Constant *DIDerivedType::getStorageOffsetInBits() const {
}
Constant *DIDerivedType::getConstant() const {
- assert(getTag() == dwarf::DW_TAG_member && isStaticMember());
+ assert((getTag() == dwarf::DW_TAG_member ||
+ getTag() == dwarf::DW_TAG_variable) &&
+ isStaticMember());
if (auto *C = cast_or_null<ConstantAsMetadata>(getExtraData()))
return C->getValue();
return nullptr;
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index b1d1075285c2210..25981d8dccb11e7 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -1172,6 +1172,7 @@ void Verifier::visitDIDerivedType(const DIDerivedType &N)
{
N.getTag() == dwarf::DW_TAG_restrict_type ||
N.getTag() == dwarf::DW_TAG_atomic_type ||
N.getTag() == dwarf::DW_TAG_member ||
+ (N.getTag() == dwarf::DW_TAG_variable && N.isStaticMember()) ||
N.getTag() == dwarf::DW_TAG_inheritance ||
N.getTag() == dwarf::DW_TAG_friend ||
N.getTag() == dwarf::DW_TAG_set_type,
diff --git a/llvm/test/DebugInfo/Generic/dwarf5-debug-info-static-member.ll
b/llvm/test/DebugInfo/Generic/dwarf5-debug-info-static-member.ll
new file mode 100644
index 000000000000000..6e8f48d652e34b2
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/dwarf5-debug-info-static-member.ll
@@ -0,0 +1,109 @@
+; RUN: %llc_dwarf -filetype=obj -o %t.o < %s
+; RUN: llvm-dwarfdump -v -debug-info %t.o | FileCheck %s -check-prefix=CHECK
+
+; LLVM IR generated using: clang -emit-llvm -S -g -gdwarf-5
+;
+; struct C
+; {
+; static int a;
+; const static bool b = true;
+; static constexpr int c = 15;
+; };
+;
+; int C::a = 10;
+;
+; int main()
+; {
+; C instance_C;
+; return C::a + (int)C::b + C::c;
+; }
+
+source_filename = "llvm/test/DebugInfo/X86/dwarf5-debug-info-static-member.ll"
+
+%struct.C = type { i8 }
+
+@_ZN1C1aE = global i32 10, align 4, !dbg !0
+
+; Function Attrs: mustprogress noinline norecurse nounwind optnone ssp
uwtable(sync)
+define noundef i32 @main() #0 !dbg !26 {
+entry:
+ %retval = alloca i32, align 4
+ %instance_C = alloca %struct.C, align 1
+ store i32 0, ptr %retval, align 4
+ call void @llvm.dbg.declare(metadata ptr %instance_C, metadata !30, metadata
!DIExpression()), !dbg !31
+ %0 = load i32, ptr @_ZN1C1aE, align 4, !dbg !32
+ %add = add nsw i32 %0, 1, !dbg !33
+ %add1 = add nsw i32 %add, 15, !dbg !34
+ ret i32 %add1, !dbg !35
+}
+
+; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn
memory(none)
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind uwtable }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!19, !20, !21, !22, !23, !24}
+!llvm.ident = !{!25}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", linkageName: "_ZN1C1aE", scope: !2,
file: !3, line: 8, type: !5, isLocal: false, isDefinition: true, declaration:
!8)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3,
producer: "clang version 18.0.0", isOptimized: false, runtimeVersion: 0,
emissionKind: FullDebug, retainedTypes: !4, globals: !14, splitDebugInlining:
false, nameTableKind: Apple, sysroot: "/")
+!3 = !DIFile(filename: "main.cpp", directory: "/tmp", checksumkind: CSK_MD5,
checksum: "b2547f7df8f54777c012dbfbd626f155")
+!4 = !{!5, !6}
+!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "C", file:
!3, line: 1, size: 8, flags: DIFlagTypePassByValue, elements: !7, identifier:
"_ZTS1C")
+!7 = !{!8, !9, !12}
+!8 = !DIDerivedType(tag: DW_TAG_variable, name: "a", scope: !6, file: !3,
line: 3, baseType: !5, flags: DIFlagStaticMember)
+!9 = !DIDerivedType(tag: DW_TAG_variable, name: "b", scope: !6, file: !3,
line: 4, baseType: !10, flags: DIFlagStaticMember)
+!10 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !11)
+!11 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
+!12 = !DIDerivedType(tag: DW_TAG_variable, name: "c", scope: !6, file: !3,
line: 5, baseType: !13, flags: DIFlagStaticMember)
+!13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !5)
+!14 = !{!0, !15, !17}
+!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression(DW_OP_constu,
1, DW_OP_stack_value))
+!16 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 4,
type: !10, isLocal: true, isDefinition: true, declaration: !9)
+!17 = !DIGlobalVariableExpression(var: !18, expr: !DIExpression(DW_OP_constu,
15, DW_OP_stack_value))
+!18 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 5,
type: !13, isLocal: true, isDefinition: true, declaration: !12)
+!19 = !{i32 7, !"Dwarf Version", i32 5}
+!20 = !{i32 2, !"Debug Info Version", i32 3}
+!21 = !{i32 1, !"wchar_size", i32 4}
+!22 = !{i32 8, !"PIC Level", i32 2}
+!23 = !{i32 7, !"uwtable", i32 1}
+!24 = !{i32 7, !"frame-pointer", i32 1}
+!25 = !{!"clang version 18.0.0"}
+!26 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 10,
type: !27, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition,
unit: !2, retainedNodes: !29)
+!27 = !DISubroutineType(types: !28)
+!28 = !{!5}
+!29 = !{}
+!30 = !DILocalVariable(name: "instance_C", scope: !26, file: !3, line: 12,
type: !6)
+!31 = !DILocation(line: 12, column: 5, scope: !26)
+!32 = !DILocation(line: 13, column: 10, scope: !26)
+!33 = !DILocation(line: 13, column: 15, scope: !26)
+!34 = !DILocation(line: 13, column: 27, scope: !26)
+!35 = !DILocation(line: 13, column: 3, scope: !26)
+
+; CHECK: .debug_info contents:
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_specification {{.*}} "a"
+; CHECK: DW_TAG_structure_type
+; CHECK: DW_AT_name {{.*}} "C"
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_name {{.*}} "a"
+; CHECK: DW_AT_external
+; CHECK: DW_AT_declaration
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_name {{.*}} "b"
+; CHECK: DW_AT_external
+; CHECK: DW_AT_declaration
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_name {{.*}} "c"
+; CHECK: DW_AT_external
+; CHECK: DW_AT_declaration
+; CHECK: NULL
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_specification {{.*}} "b"
+; CHECK-NEXT: DW_AT_const_value
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_specification {{.*}} "c"
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