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PR14759: Debug info support for C++ member pointers.

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This works fine with GDB for member variable pointers, but GDB's support for
member function pointers seems to be quite unrelated to
DW_TAG_ptr_to_member_type. (see GDB bug 14998 for details)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171698 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2013-01-07 05:51:15 +00:00
parent 71ab7a79a7
commit 62fdfb5fa7
6 changed files with 67 additions and 0 deletions
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5
include/llvm/DIBuilder.h
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@ -126,6 +126,11 @@ namespace llvm {
uint64_t AlignInBits = 0,
StringRef Name = StringRef());
/// \brief Create debugging information entry for a pointer to member.
/// @param PointeeTy Type pointed to by this pointer.
/// @param Class Type for which this pointer points to members of.
DIType createMemberPointerType(DIType PointeeTy, DIType Class);
/// createReferenceType - Create debugging information entry for a c++
/// style reference or rvalue reference type.
DIType createReferenceType(unsigned Tag, DIType RTy);

5
include/llvm/DebugInfo.h
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@ -354,6 +354,11 @@ namespace llvm {
/// associated with one.
MDNode *getObjCProperty() const;
DIType getClassType() const {
assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
return getFieldAs<DIType>(10);
}
StringRef getObjCPropertyName() const {
if (getVersion() > LLVMDebugVersion11)
return StringRef();

3
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -784,6 +784,9 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
if (Size && Tag != dwarf::DW_TAG_pointer_type)
addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
if (Tag == dwarf::DW_TAG_ptr_to_member_type)
addDIEEntry(&Buffer, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4,
getOrCreateTypeDIE(DTy.getClassType()));
// Add source line info if available and TyDesc is not a forward declaration.
if (!DTy.isForwardDecl())
addSourceLine(&Buffer, DTy);

18
lib/IR/DIBuilder.cpp
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@ -229,6 +229,24 @@ DIType DIBuilder::createPointerType(DIType PointeeTy, uint64_t SizeInBits,
return DIType(MDNode::get(VMContext, Elts));
}
DIType DIBuilder::createMemberPointerType(DIType PointeeTy, DIType Base) {
// Pointer types are encoded in DIDerivedType format.
Value *Elts[] = {
GetTagConstant(VMContext, dwarf::DW_TAG_ptr_to_member_type),
NULL, //TheCU,
NULL,
NULL, // Filename
ConstantInt::get(Type::getInt32Ty(VMContext), 0), // Line
ConstantInt::get(Type::getInt64Ty(VMContext), 0),
ConstantInt::get(Type::getInt64Ty(VMContext), 0),
ConstantInt::get(Type::getInt64Ty(VMContext), 0), // Offset
ConstantInt::get(Type::getInt32Ty(VMContext), 0), // Flags
PointeeTy,
Base
};
return DIType(MDNode::get(VMContext, Elts));
}
/// createReferenceType - Create debugging information entry for a reference
/// type.
DIType DIBuilder::createReferenceType(unsigned Tag, DIType RTy) {

2
lib/IR/DebugInfo.cpp
View File

@ -172,6 +172,7 @@ bool DIDescriptor::isDerivedType() const {
switch (getTag()) {
case dwarf::DW_TAG_typedef:
case dwarf::DW_TAG_pointer_type:
case dwarf::DW_TAG_ptr_to_member_type:
case dwarf::DW_TAG_reference_type:
case dwarf::DW_TAG_rvalue_reference_type:
case dwarf::DW_TAG_const_type:
@ -423,6 +424,7 @@ bool DIType::Verify() const {
unsigned Tag = getTag();
if (!isBasicType() && Tag != dwarf::DW_TAG_const_type &&
Tag != dwarf::DW_TAG_volatile_type && Tag != dwarf::DW_TAG_pointer_type &&
Tag != dwarf::DW_TAG_ptr_to_member_type &&
Tag != dwarf::DW_TAG_reference_type &&
Tag != dwarf::DW_TAG_rvalue_reference_type &&
Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_vector_type &&

34
test/DebugInfo/member-pointers.ll Normal file
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@ -0,0 +1,34 @@
; RUN: llc -filetype=obj -O0 < %s > %t
; RUN: llvm-dwarfdump %t | FileCheck %s
; CHECK: DW_TAG_ptr_to_member_type
; CHECK: DW_TAG_ptr_to_member_type
; IR generated from clang -g with the following source:
; struct S {
; };
;
; int S::*x = 0;
; void (S::*y)(int) = 0;
; ModuleID = 'simple.cpp'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@x = global i64 -1, align 8
@y = global { i64, i64 } zeroinitializer, align 8
!llvm.dbg.cu = !{!0}
!0 = metadata !{i32 786449, i32 0, i32 4, metadata !"simple.cpp", metadata !"/home/blaikie/Development/scratch", metadata !"clang version 3.3 ", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !1, metadata !3} ; [ DW_TAG_compile_unit ] [/home/blaikie/Development/scratch/simple.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !2}
!2 = metadata !{i32 0}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !5, metadata !10}
!5 = metadata !{i32 786484, i32 0, null, metadata !"x", metadata !"x", metadata !"", metadata !6, i32 2, metadata !7, i32 0, i32 1, i64* @x} ; [ DW_TAG_variable ] [x] [line 2] [def]
!6 = metadata !{i32 786473, metadata !"simple.cpp", metadata !"/home/blaikie/Development/scratch", null} ; [ DW_TAG_file_type ]
!7 = metadata !{i32 786463, null, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !8, metadata !9} ; [ DW_TAG_ptr_to_member_type ] [line 0, size 0, align 0, offset 0] [from int]
!8 = metadata !{i32 786468, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!9 = metadata !{i32 786451, null, metadata !"S", metadata !6, i32 1, i64 8, i64 8, i32 0, i32 0, null, metadata !2, i32 0, null, null} ; [ DW_TAG_structure_type ] [S] [line 1, size 8, align 8, offset 0] [from ]
!10 = metadata !{i32 786484, i32 0, null, metadata !"y", metadata !"y", metadata !"", metadata !6, i32 3, metadata !11, i32 0, i32 1, { i64, i64 }* @y} ; [ DW_TAG_variable ] [y] [line 3] [def]
!11 = metadata !{i32 786463, null, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !12, metadata !9} ; [ DW_TAG_ptr_to_member_type ] [line 0, size 0, align 0, offset 0] [from ]
!12 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !13, i32 0, i32 0} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!13 = metadata !{null, metadata !8}