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[DebugInfo] Add support for DW_AT_main_subprogram on subprograms 

Patch by Tom Tromey! (for use with Rust)

llvm-svn: 288068
This commit is contained in:
David Blaikie 2016-11-28 21:32:19 +00:00
parent 809dea2aeb
commit ce3c8ef26e
4 changed files with 41 additions and 1 deletions
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3
llvm/include/llvm/IR/DebugInfoFlags.def
View File

@ -41,6 +41,7 @@ HANDLE_DI_FLAG((3 << 16), VirtualInheritance)
HANDLE_DI_FLAG((1 << 18), IntroducedVirtual)
HANDLE_DI_FLAG((1 << 19), BitField)
HANDLE_DI_FLAG((1 << 20), NoReturn)
HANDLE_DI_FLAG((1 << 21), MainSubprogram)
// To avoid needing a dedicated value for IndirectVirtualBase, we use
// the bitwise or of Virtual and FwdDecl, which does not otherwise
@ -50,7 +51,7 @@ HANDLE_DI_FLAG((1 << 2) | (1 << 5), IndirectVirtualBase)
#ifdef DI_FLAG_LARGEST_NEEDED
// intended to be used with ADT/BitmaskEnum.h
// NOTE: always must be equal to largest flag, check this when adding new flag
HANDLE_DI_FLAG((1 << 20), Largest)
HANDLE_DI_FLAG((1 << 21), Largest)
#undef DI_FLAG_LARGEST_NEEDED
#endif

1
llvm/include/llvm/IR/DebugInfoMetadata.h
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@ -1438,6 +1438,7 @@ public:
}
bool isExplicit() const { return getFlags() & FlagExplicit; }
bool isPrototyped() const { return getFlags() & FlagPrototyped; }
bool isMainSubprogram() const { return getFlags() & FlagMainSubprogram; }
/// Check if this is reference-qualified.
///

3
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
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@ -1282,6 +1282,9 @@ void DwarfUnit::applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
if (SP->isExplicit())
addFlag(SPDie, dwarf::DW_AT_explicit);
if (SP->isMainSubprogram())
addFlag(SPDie, dwarf::DW_AT_main_subprogram);
}
void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,

35
llvm/test/DebugInfo/Generic/mainsubprogram.ll Normal file
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@ -0,0 +1,35 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s > %t
; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
; Make sure we're emitting DW_AT_main_subprogram.
; CHECK: DW_TAG_subprogram
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_AT_name {{.*}} "main"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_AT_main_subprogram [DW_FORM_flag_present] (true)
define i32 @main() #0 !dbg !4 {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval
ret i32 0, !dbg !10
}
attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!9, !11}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 185475)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!1 = !DIFile(filename: "CodeGen/dwarf-version.c", directory: "test")
!2 = !{}
!4 = distinct !DISubprogram(name: "main", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped | DIFlagMainSubprogram, isOptimized: false, unit: !0, scopeLine: 6, file: !1, scope: !5, type: !6, variables: !2)
!5 = !DIFile(filename: "CodeGen/dwarf-version.c", directory: "test")
!6 = !DISubroutineType(types: !7)
!7 = !{!8}
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !{i32 2, !"Dwarf Version", i32 4}
!10 = !DILocation(line: 7, scope: !4)
!11 = !{i32 1, !"Debug Info Version", i32 3}