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5f220beefc
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252219 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
3.7 KiB
LLVM
92 lines
3.7 KiB
LLVM
; REQUIRES: default_triple, object-emission
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; RUN: llvm-link %s %p/type-unique-simple-b.ll -S -o %t
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; RUN: cat %t | FileCheck %s -check-prefix=LINK
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; RUN: %llc_dwarf -filetype=obj -O0 < %t > %t2
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; RUN: llvm-dwarfdump -debug-dump=info %t2 | FileCheck %s
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; Make sure the backend generates a single DIE and uses ref_addr.
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; CHECK: 0x[[BASE:.*]]: DW_TAG_structure_type
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; CHECK-NEXT: DW_AT_name {{.*}} = "Base"
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; CHECK-NOT: DW_TAG_structure_type
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; CHECK: 0x[[INT:.*]]: DW_TAG_base_type
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; CHECK-NEXT: DW_AT_name {{.*}} = "int"
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; CHECK-NOT: DW_TAG_base_type
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[INT]])
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_type [DW_FORM_ref_addr] {{.*}}[[BASE]])
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; Make sure llvm-link only generates a single copy of the struct.
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; LINK: DW_TAG_structure_type
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; LINK-NOT: DW_TAG_structure_type
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; Content of header files:
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; struct Base {
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; int a;
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; };
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; Content of foo.cpp:
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;
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; #include "a.hpp"
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; void f(int a) {
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; Base t;
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; }
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; Content of bar.cpp:
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;
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; #include "a.hpp"
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; void f(int);
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; void g(int a) {
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; Base t;
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; }
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; int main() {
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; f(0);
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; g(1);
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; return 0;
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; }
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; ModuleID = 'foo.cpp'
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%struct.Base = type { i32 }
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; Function Attrs: nounwind ssp uwtable
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define void @_Z1fi(i32 %a) #0 !dbg !10 {
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entry:
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%a.addr = alloca i32, align 4
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%t = alloca %struct.Base, align 4
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store i32 %a, i32* %a.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %a.addr, metadata !15, metadata !DIExpression()), !dbg !16
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call void @llvm.dbg.declare(metadata %struct.Base* %t, metadata !17, metadata !DIExpression()), !dbg !18
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ret void, !dbg !19
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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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attributes #0 = { nounwind ssp 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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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !20}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 (http://llvm.org/git/clang.git c23b1db6268c8e7ce64026d57d1510c1aac200a0) (http://llvm.org/git/llvm.git 09b98fe3978eddefc2145adc1056cf21580ce945)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !3, subprograms: !9, globals: !2, imports: !2)
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!1 = !DIFile(filename: "foo.cpp", directory: "/Users/mren/c_testing/type_unique_air/simple")
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!2 = !{}
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!3 = !{!4}
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "Base", line: 1, size: 32, align: 32, file: !5, elements: !6, identifier: "_ZTS4Base")
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!5 = !DIFile(filename: "./a.hpp", directory: "/Users/mren/c_testing/type_unique_air/simple")
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!6 = !{!7}
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!7 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 2, size: 32, align: 32, file: !5, scope: !"_ZTS4Base", baseType: !8)
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{!10}
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!10 = distinct !DISubprogram(name: "f", linkageName: "_Z1fi", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !11, type: !12, variables: !2)
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!11 = !DIFile(filename: "foo.cpp", directory: "/Users/mren/c_testing/type_unique_air/simple")
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !8}
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!14 = !{i32 2, !"Dwarf Version", i32 2}
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!15 = !DILocalVariable(name: "a", line: 3, arg: 1, scope: !10, file: !11, type: !8)
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!16 = !DILocation(line: 3, scope: !10)
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!17 = !DILocalVariable(name: "t", line: 4, scope: !10, file: !11, type: !4)
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!18 = !DILocation(line: 4, scope: !10)
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!19 = !DILocation(line: 5, scope: !10)
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!20 = !{i32 1, !"Debug Info Version", i32 3}
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