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[IR/DIVar] Add the flag for params that have unmodified value

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Introduce the debug info flag that indicates that a parameter has unchanged
value throughout a function. This info will be used to emit the expressions
with DW_OP_entry_value.

([4/13] Introduce the debug entry values.)

Co-authored-by: Ananth Sowda <asowda@cisco.com>
Co-authored-by: Nikola Prica <nikola.prica@rt-rk.com>
Co-authored-by: Ivan Baev <ibaev@cisco.com>

Differential Revision: https://reviews.llvm.org/D58034

llvm-svn: 364406
This commit is contained in:
Djordje Todorovic 2019-06-26 11:19:26 +00:00
parent a6319e5f83
commit e821e79fce
5 changed files with 26 additions and 2 deletions
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1
llvm/bindings/go/llvm/dibuilder.go
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@ -54,6 +54,7 @@ const (
FlagVector
FlagStaticMember
FlagIndirectVariable
FlagArgumentNotModified
)
type DwarfLang uint32

12
llvm/docs/LangRef.rst
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@ -4764,6 +4764,18 @@ valid debug intrinsic.
!4 = !DIExpression(DW_OP_constu, 2, DW_OP_swap, DW_OP_xderef)
!5 = !DIExpression(DW_OP_constu, 42, DW_OP_stack_value)
DIFlags
"""""""""""""""
These flags encode various properties of DINodes.
The `ArgumentNotModified` flag marks a function argument whose value
is not modified throughout of a function. This flag is used to decide
whether a DW_OP_entry_value can be used in a location description
after the function prologue. The language frontend is expected to compute
this property for each DILocalVariable. The flag should be used
only in optimized code.
DIObjCProperty
""""""""""""""

1
llvm/include/llvm/IR/DebugInfoFlags.def
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@ -50,6 +50,7 @@ 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), ArgumentNotModified)
HANDLE_DI_FLAG((1 << 22), TypePassByValue)
HANDLE_DI_FLAG((1 << 23), TypePassByReference)
HANDLE_DI_FLAG((1 << 24), EnumClass)

5
llvm/include/llvm/IR/DebugInfoMetadata.h
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@ -2796,6 +2796,11 @@ public:
bool isArtificial() const { return getFlags() & FlagArtificial; }
bool isObjectPointer() const { return getFlags() & FlagObjectPointer; }
/// Check that an argument is unmodified.
bool isNotModified() const { return getFlags() & FlagArgumentNotModified; }
/// Set the flag if an argument is unmodified.
void setIsNotModified() { Flags |= FlagArgumentNotModified; }
/// Check that a location is valid for this variable.
///
/// Check that \c DL exists, is in the same subprogram, and has the same

9
llvm/test/Assembler/debug-info.ll
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@ -1,8 +1,8 @@
; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
; RUN: verify-uselistorder %s
; CHECK: !named = !{!0, !0, !1, !2, !3, !4, !5, !6, !7, !8, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !27, !28, !29, !30, !31, !32, !33, !34, !35, !36, !37, !38, !39}
!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34, !35, !36, !37, !38, !39, !40, !41, !42}
; CHECK: !named = !{!0, !0, !1, !2, !3, !4, !5, !6, !7, !8, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !27, !28, !29, !30, !31, !32, !33, !34, !35, !36, !37, !38, !39, !40, !41}
!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34, !35, !36, !37, !38, !39, !40, !41, !42, !43, !44}
; CHECK: !0 = !DISubrange(count: 3)
; CHECK-NEXT: !1 = !DISubrange(count: 3, lowerBound: 4)
@ -99,3 +99,8 @@
; CHECK-NEXT: !39 = !DIBasicType(name: "u64.le", size: 64, align: 1, encoding: DW_ATE_unsigned, flags: DIFlagLittleEndian)
!41 = !DIBasicType(name: "u64.be", size: 64, align: 1, encoding: DW_ATE_unsigned, flags: DIFlagBigEndian)
!42 = !DIBasicType(name: "u64.le", size: 64, align: 1, encoding: DW_ATE_unsigned, flags: DIFlagLittleEndian)
; CHECK-NEXT: !40 = distinct !DISubprogram(name: "fn", scope: {{.*}}, file: {{.*}}, spFlags: 0)
; CHECK-NEXT: !41 = !DILocalVariable(name: "Name", arg: 1, scope: {{.*}}, file: {{.*}}, line: 13, type: {{.*}}, flags: DIFlagArgumentNotModified)
!43 = distinct !DISubprogram(name: "fn", scope: !12, file: !12, spFlags: 0)
!44 = !DILocalVariable(name: "Name", arg: 1, scope: !43, file: !12, line: 13, type: !7, flags: DIFlagArgumentNotModified)