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[DebugInfo] Fix emitting offsets to CUs with -dwarf-sections-as-references=Enable.

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The size of the field depends on the DWARF format, not the address size
of the target.

Differential Revision: https://reviews.llvm.org/D82311
This commit is contained in:
Igor Kudrin 2020-06-22 23:22:18 +07:00
parent 8e4bd7c3f3
commit 4bfbd85d51
2 changed files with 29 additions and 1 deletions
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3
lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
View File

@ -181,7 +181,8 @@ void AsmPrinter::emitDwarfStringOffset(DwarfStringPoolEntry S) const {
}
void AsmPrinter::emitDwarfOffset(const MCSymbol *Label, uint64_t Offset) const {
emitLabelPlusOffset(Label, Offset, MAI->getCodePointerSize());
// TODO: Support DWARF64
emitLabelPlusOffset(Label, Offset, 4);
}
void AsmPrinter::emitCallSiteOffset(const MCSymbol *Hi, const MCSymbol *Lo,

27
test/DebugInfo/X86/sections-as-references-cu-offset.ll Normal file
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@ -0,0 +1,27 @@
; Test that references to CU are 4 bytes long when the target is 64-bit
; and -dwarf-sections-as-references=Enable is specified.
; RUN: llc -filetype=asm -mtriple=x86_64-linux-gnu -dwarf-sections-as-references=Enable < %s \
; RUN: | FileCheck %s
; CHECK: .section .debug_pubnames
; CHECK: .long .debug_info # Offset of Compilation Unit Info
; CHECK: .section .debug_pubtypes
; CHECK: .long .debug_info # Offset of Compilation Unit Info
%struct.foo = type { i8 }
@f = global %struct.foo zeroinitializer, align 1, !dbg !0
!llvm.dbg.cu = !{!5}
!llvm.module.flags = !{!8}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "f", scope: null, file: !2, line: 2, type: !3, isLocal: false, isDefinition: true)
!2 = !DIFile(filename: "tu1.cpp", directory: "/dir")
!3 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", file: !2, line: 1, size: 8, align: 8, elements: !4, identifier: "_ZTS3foo")
!4 = !{}
!5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !6, globals: !7, imports: !4)
!6 = !{!3}
!7 = !{!0}
!8 = !{i32 1, !"Debug Info Version", i32 3}