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[DIBuilder] Make createReferenceType take size and align

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Summary: Since we're passing references to dbg.value as pointers,
we need to have the frontend properly declare their sizes and
alignments (as it already does for regular pointers) in preparation
for my upcoming patch to have the verifer check that the sizes agree.

Also augment the backend logic that skips actually emitting this
information into DWARF such that it also handles reference types.

Reviewers: aprantl, dexonsmith, dblaikie

Subscribers: dblaikie, llvm-commits

Differential Revision: http://reviews.llvm.org/D14275

llvm-svn: 253186
This commit is contained in:
Keno Fischer 2015-11-16 07:57:32 +00:00
parent 06ae954df6
commit 0118e7cd94
4 changed files with 56 additions and 4 deletions
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4
include/llvm/IR/DIBuilder.h
View File

@ -158,7 +158,9 @@ namespace llvm {
/// Create debugging information entry for a c++
/// style reference or rvalue reference type.
DIDerivedType *createReferenceType(unsigned Tag, DIType *RTy);
DIDerivedType *createReferenceType(unsigned Tag, DIType *RTy,
uint64_t SizeInBits = 0,
uint64_t AlignInBits = 0);
/// Create debugging information entry for a typedef.
/// \param Ty Original type.

4
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
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@ -853,7 +853,9 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy) {
// Add size if non-zero (derived types might be zero-sized.)
if (Size && Tag != dwarf::DW_TAG_pointer_type
&& Tag != dwarf::DW_TAG_ptr_to_member_type)
&& Tag != dwarf::DW_TAG_ptr_to_member_type
&& Tag != dwarf::DW_TAG_reference_type
&& Tag != dwarf::DW_TAG_rvalue_reference_type)
addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
if (Tag == dwarf::DW_TAG_ptr_to_member_type)

6
lib/IR/DIBuilder.cpp
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@ -255,10 +255,12 @@ DIDerivedType *DIBuilder::createMemberPointerType(DIType *PointeeTy,
DITypeRef::get(Base));
}
DIDerivedType *DIBuilder::createReferenceType(unsigned Tag, DIType *RTy) {
DIDerivedType *DIBuilder::createReferenceType(unsigned Tag, DIType *RTy,
uint64_t SizeInBits,
uint64_t AlignInBits) {
assert(RTy && "Unable to create reference type");
return DIDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
DITypeRef::get(RTy), 0, 0, 0, 0);
DITypeRef::get(RTy), SizeInBits, AlignInBits, 0, 0);
}
DIDerivedType *DIBuilder::createTypedef(DIType *Ty, StringRef Name,

46
test/DebugInfo/Generic/ptrsize.ll Executable file
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@ -0,0 +1,46 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
; RUN: llvm-dwarfdump %t | FileCheck %s
; Check that pointers and references get emitted without size information in
; DWARF, even if they are so specified in the IR
; CHECK: 0x[[O1:[0-9a-f]+]]: DW_TAG_pointer_type
; CHECK-NEXT: DW_AT_type [DW_FORM_ref4]
; CHECK-NOT: DW_AT_byte_size
; CHECK: 0x[[O2:[0-9a-f]+]]: DW_TAG_
; CHECK: 0x[[O3:[0-9a-f]+]]: DW_TAG_reference_type
; CHECK-NEXT: DW_AT_type [DW_FORM_ref4]
; CHECK-NOT: DW_AT_byte_size
define i32 @foo() !dbg !4 {
entry:
ret i32 0, !dbg !13
}
define i32 @bar() !dbg !5 {
entry:
ret i32 0, !dbg !13
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!11, !12}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: 0, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "dwarf-test.c", directory: "test")
!2 = !{}
!3 = !{!4, !5}
!4 = distinct !DISubprogram(name: "foo", scope: !0, file: !1, line: 6, type: !6, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!5 = distinct !DISubprogram(name: "bar", scope: !0, file: !1, line: 6, type: !15, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, variables: !2)
!6 = !DISubroutineType(types: !7)
!7 = !{!9}
!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !0, baseType: !8, size: 64, align: 64)
!10 = !DIDerivedType(tag: DW_TAG_reference_type, scope: !0, baseType: !8, size: 64, align: 64)
!11 = !{i32 2, !"Dwarf Version", i32 3}
!12 = !{i32 1, !"Debug Info Version", i32 3}
!13 = !DILocation(line: 7, scope: !4)
!14 = !{!10}
!15 = !DISubroutineType(types: !14)