[llvm] r288068 - [DebugInfo] Add support for DW_AT_main_subprogram on subprograms
David Blaikie via llvm-commits
llvm-commits at lists.llvm.org
Mon Nov 28 13:32:19 PST 2016
Author: dblaikie
Date: Mon Nov 28 15:32:19 2016
New Revision: 288068
URL: http://llvm.org/viewvc/llvm-project?rev=288068&view=rev
Log:
[DebugInfo] Add support for DW_AT_main_subprogram on subprograms
Patch by Tom Tromey! (for use with Rust)
Added:
llvm/trunk/test/DebugInfo/Generic/mainsubprogram.ll
Modified:
llvm/trunk/include/llvm/IR/DebugInfoFlags.def
llvm/trunk/include/llvm/IR/DebugInfoMetadata.h
llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
Modified: llvm/trunk/include/llvm/IR/DebugInfoFlags.def
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/DebugInfoFlags.def?rev=288068&r1=288067&r2=288068&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/DebugInfoFlags.def (original)
+++ llvm/trunk/include/llvm/IR/DebugInfoFlags.def Mon Nov 28 15:32:19 2016
@@ -41,6 +41,7 @@ HANDLE_DI_FLAG((3 << 16), VirtualInherit
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), Indi
#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
Modified: llvm/trunk/include/llvm/IR/DebugInfoMetadata.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/DebugInfoMetadata.h?rev=288068&r1=288067&r2=288068&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/DebugInfoMetadata.h (original)
+++ llvm/trunk/include/llvm/IR/DebugInfoMetadata.h Mon Nov 28 15:32:19 2016
@@ -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.
///
Modified: llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp?rev=288068&r1=288067&r2=288068&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp (original)
+++ llvm/trunk/lib/CodeGen/AsmPrinter/DwarfUnit.cpp Mon Nov 28 15:32:19 2016
@@ -1282,6 +1282,9 @@ void DwarfUnit::applySubprogramAttribute
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,
Added: llvm/trunk/test/DebugInfo/Generic/mainsubprogram.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/Generic/mainsubprogram.ll?rev=288068&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/Generic/mainsubprogram.ll (added)
+++ llvm/trunk/test/DebugInfo/Generic/mainsubprogram.ll Mon Nov 28 15:32:19 2016
@@ -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}
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