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5b721561aa
Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
131 lines
5.8 KiB
LLVM
131 lines
5.8 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; bool f();
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; inline __attribute__((always_inline)) int f1() {
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; if (bool b = f())
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; return 1;
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; return 2;
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; }
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;
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; inline __attribute__((always_inline)) int f2() {
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; # 2 "y.cc"
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; if (bool b = f())
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; return 3;
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; return 4;
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; }
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;
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; int main() {
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; f1();
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; f2();
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; }
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; Ensure that lexical_blocks within inlined_subroutines are preserved/emitted.
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK-NOT: DW_TAG
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_lexical_block
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; CHECK-NOT: DW_TAG
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_variable
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; Ensure that file changes don't interfere with creating inlined subroutines.
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; (see the line directive inside 'f2' in thesource)
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; CHECK: DW_TAG_inlined_subroutine
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_abstract_origin
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; Function Attrs: uwtable
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define i32 @main() #0 !dbg !4 {
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entry:
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%retval.i2 = alloca i32, align 4
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%b.i3 = alloca i8, align 1
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%retval.i = alloca i32, align 4
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%b.i = alloca i8, align 1
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call void @llvm.dbg.declare(metadata i8* %b.i, metadata !16, metadata !DIExpression()), !dbg !19
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%call.i = call zeroext i1 @_Z1fv(), !dbg !19
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%frombool.i = zext i1 %call.i to i8, !dbg !19
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store i8 %frombool.i, i8* %b.i, align 1, !dbg !19
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%0 = load i8, i8* %b.i, align 1, !dbg !19
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%tobool.i = trunc i8 %0 to i1, !dbg !19
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br i1 %tobool.i, label %if.then.i, label %if.end.i, !dbg !19
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if.then.i: ; preds = %entry
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store i32 1, i32* %retval.i, !dbg !21
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br label %_Z2f1v.exit, !dbg !21
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if.end.i: ; preds = %entry
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store i32 2, i32* %retval.i, !dbg !22
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br label %_Z2f1v.exit, !dbg !22
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_Z2f1v.exit: ; preds = %if.then.i, %if.end.i
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%1 = load i32, i32* %retval.i, !dbg !23
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call void @llvm.dbg.declare(metadata i8* %b.i3, metadata !24, metadata !DIExpression()), !dbg !27
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%call.i4 = call zeroext i1 @_Z1fv(), !dbg !27
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%frombool.i5 = zext i1 %call.i4 to i8, !dbg !27
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store i8 %frombool.i5, i8* %b.i3, align 1, !dbg !27
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%2 = load i8, i8* %b.i3, align 1, !dbg !27
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%tobool.i6 = trunc i8 %2 to i1, !dbg !27
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br i1 %tobool.i6, label %if.then.i7, label %if.end.i8, !dbg !27
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if.then.i7: ; preds = %_Z2f1v.exit
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store i32 3, i32* %retval.i2, !dbg !29
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br label %_Z2f2v.exit, !dbg !29
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if.end.i8: ; preds = %_Z2f1v.exit
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store i32 4, i32* %retval.i2, !dbg !30
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br label %_Z2f2v.exit, !dbg !30
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_Z2f2v.exit: ; preds = %if.then.i7, %if.end.i8
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%3 = load i32, i32* %retval.i2, !dbg !31
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ret i32 0, !dbg !32
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare zeroext i1 @_Z1fv() #2
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attributes #0 = { 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" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { "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" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "inline-scopes.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4, !10, !12}
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!4 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 7, file: !5, scope: !6, type: !7, variables: !2)
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!5 = !DIFile(filename: "y.cc", directory: "/tmp/dbginfo")
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!6 = !DIFile(filename: "y.cc", directory: "/tmp/dbginfo")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", line: 8, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 8, file: !1, scope: !11, type: !7, variables: !2)
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!11 = !DIFile(filename: "inline-scopes.cpp", directory: "/tmp/dbginfo")
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!12 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !11, type: !7, variables: !2)
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!13 = !{i32 2, !"Dwarf Version", i32 4}
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!14 = !{i32 1, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.5.0 "}
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!16 = !DILocalVariable(name: "b", line: 3, scope: !17, file: !11, type: !18)
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!17 = distinct !DILexicalBlock(line: 3, column: 0, file: !1, scope: !12)
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!18 = !DIBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean)
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!19 = !DILocation(line: 3, scope: !17, inlinedAt: !20)
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!20 = !DILocation(line: 8, scope: !4)
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!21 = !DILocation(line: 4, scope: !17, inlinedAt: !20)
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!22 = !DILocation(line: 5, scope: !12, inlinedAt: !20)
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!23 = !DILocation(line: 6, scope: !12, inlinedAt: !20)
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!24 = !DILocalVariable(name: "b", line: 2, scope: !25, file: !6, type: !18)
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!25 = distinct !DILexicalBlock(line: 2, column: 0, file: !5, scope: !26)
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!26 = !DILexicalBlockFile(discriminator: 0, file: !5, scope: !10)
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!27 = !DILocation(line: 2, scope: !25, inlinedAt: !28)
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!28 = !DILocation(line: 9, scope: !4)
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!29 = !DILocation(line: 3, scope: !25, inlinedAt: !28)
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!30 = !DILocation(line: 4, scope: !26, inlinedAt: !28)
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!31 = !DILocation(line: 5, scope: !26, inlinedAt: !28)
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!32 = !DILocation(line: 10, scope: !4)
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