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PR14759: Debug info support for C++ member pointers.
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
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@ -126,6 +126,11 @@ namespace llvm {
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uint64_t AlignInBits = 0,
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StringRef Name = StringRef());
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/// \brief Create debugging information entry for a pointer to member.
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/// @param PointeeTy Type pointed to by this pointer.
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/// @param Class Type for which this pointer points to members of.
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DIType createMemberPointerType(DIType PointeeTy, DIType Class);
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/// createReferenceType - Create debugging information entry for a c++
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/// style reference or rvalue reference type.
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DIType createReferenceType(unsigned Tag, DIType RTy);
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@ -354,6 +354,11 @@ namespace llvm {
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/// associated with one.
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MDNode *getObjCProperty() const;
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DIType getClassType() const {
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assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
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return getFieldAs<DIType>(10);
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}
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StringRef getObjCPropertyName() const {
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if (getVersion() > LLVMDebugVersion11)
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return StringRef();
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@ -784,6 +784,9 @@ void CompileUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
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if (Size && Tag != dwarf::DW_TAG_pointer_type)
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addUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
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if (Tag == dwarf::DW_TAG_ptr_to_member_type)
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addDIEEntry(&Buffer, dwarf::DW_AT_containing_type, dwarf::DW_FORM_ref4,
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getOrCreateTypeDIE(DTy.getClassType()));
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// Add source line info if available and TyDesc is not a forward declaration.
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if (!DTy.isForwardDecl())
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addSourceLine(&Buffer, DTy);
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@ -229,6 +229,24 @@ DIType DIBuilder::createPointerType(DIType PointeeTy, uint64_t SizeInBits,
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return DIType(MDNode::get(VMContext, Elts));
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}
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DIType DIBuilder::createMemberPointerType(DIType PointeeTy, DIType Base) {
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// Pointer types are encoded in DIDerivedType format.
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Value *Elts[] = {
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GetTagConstant(VMContext, dwarf::DW_TAG_ptr_to_member_type),
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NULL, //TheCU,
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NULL,
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NULL, // Filename
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ConstantInt::get(Type::getInt32Ty(VMContext), 0), // Line
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ConstantInt::get(Type::getInt64Ty(VMContext), 0),
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ConstantInt::get(Type::getInt64Ty(VMContext), 0),
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ConstantInt::get(Type::getInt64Ty(VMContext), 0), // Offset
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ConstantInt::get(Type::getInt32Ty(VMContext), 0), // Flags
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PointeeTy,
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Base
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};
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return DIType(MDNode::get(VMContext, Elts));
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}
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/// createReferenceType - Create debugging information entry for a reference
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/// type.
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DIType DIBuilder::createReferenceType(unsigned Tag, DIType RTy) {
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@ -172,6 +172,7 @@ bool DIDescriptor::isDerivedType() const {
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switch (getTag()) {
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case dwarf::DW_TAG_typedef:
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case dwarf::DW_TAG_pointer_type:
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case dwarf::DW_TAG_ptr_to_member_type:
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case dwarf::DW_TAG_reference_type:
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case dwarf::DW_TAG_rvalue_reference_type:
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case dwarf::DW_TAG_const_type:
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@ -423,6 +424,7 @@ bool DIType::Verify() const {
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unsigned Tag = getTag();
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if (!isBasicType() && Tag != dwarf::DW_TAG_const_type &&
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Tag != dwarf::DW_TAG_volatile_type && Tag != dwarf::DW_TAG_pointer_type &&
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Tag != dwarf::DW_TAG_ptr_to_member_type &&
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Tag != dwarf::DW_TAG_reference_type &&
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Tag != dwarf::DW_TAG_rvalue_reference_type &&
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Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_vector_type &&
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34
test/DebugInfo/member-pointers.ll
Normal file
34
test/DebugInfo/member-pointers.ll
Normal file
@ -0,0 +1,34 @@
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; RUN: llc -filetype=obj -O0 < %s > %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; CHECK: DW_TAG_ptr_to_member_type
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; CHECK: DW_TAG_ptr_to_member_type
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; IR generated from clang -g with the following source:
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; struct S {
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; };
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;
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; int S::*x = 0;
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; void (S::*y)(int) = 0;
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; ModuleID = 'simple.cpp'
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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"
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target triple = "x86_64-unknown-linux-gnu"
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@x = global i64 -1, align 8
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@y = global { i64, i64 } zeroinitializer, align 8
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!llvm.dbg.cu = !{!0}
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!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]
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!1 = metadata !{metadata !2}
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!2 = metadata !{i32 0}
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!3 = metadata !{metadata !4}
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!4 = metadata !{metadata !5, metadata !10}
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!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]
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!6 = metadata !{i32 786473, metadata !"simple.cpp", metadata !"/home/blaikie/Development/scratch", null} ; [ DW_TAG_file_type ]
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!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]
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!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]
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!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 ]
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!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]
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!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 ]
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!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 ]
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!13 = metadata !{null, metadata !8}
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