2c864551df
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
122 lines
5.8 KiB
LLVM
122 lines
5.8 KiB
LLVM
; RUN: opt < %s -always-inline -S | FileCheck %s
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; RUN: opt -passes='always-inline' -S < %s | FileCheck %s
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; Original input generated from clang -emit-llvm -S -c -mllvm -disable-llvm-optzns
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;
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; #define CALLS1 f2(); f2();
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; #define CALLS2 f4(); f4();
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; void f1();
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; inline __attribute__((always_inline)) void f2() {
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; f1();
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; }
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; inline __attribute__((always_inline)) void f3() {
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; CALLS1
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; }
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; inline __attribute__((always_inline)) void f4() {
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; f3();
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; }
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; void f() {
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; CALLS2
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; }
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; There should be unique locations for all 4 of these instructions, correctly
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; describing the inlining that has occurred, even in the face of duplicate call
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; site locations.
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; The nomenclature used for the tags here is <function name>[cs<number>] where
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; 'cs' is an abbreviation for 'call site' and the number indicates which call
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; site from within the named function this is. (so, given the above inlining, we
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; should have 4 calls to 'f1', two from the first call to f4 and two from the
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; second call to f4)
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; CHECK: call void @_Z2f1v(), !dbg [[fcs1_f4_f3cs1_f2:![0-9]+]]
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; CHECK: call void @_Z2f1v(), !dbg [[fcs1_f4_f3cs2_f2:![0-9]+]]
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; CHECK: call void @_Z2f1v(), !dbg [[fcs2_f4_f3cs1_f2:![0-9]+]]
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; CHECK: call void @_Z2f1v(), !dbg [[fcs2_f4_f3cs2_f2:![0-9]+]]
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; CHECK-DAG: [[F:![0-9]+]] = distinct !DISubprogram(name: "f"
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; CHECK-DAG: [[F2:![0-9]+]] = distinct !DISubprogram(name: "f2"
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; CHECK-DAG: [[F3:![0-9]+]] = distinct !DISubprogram(name: "f3"
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; CHECK-DAG: [[F4:![0-9]+]] = distinct !DISubprogram(name: "f4"
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; CHECK-DAG: [[fcs1_f4_f3cs1_f2]] = {{.*}}, scope: [[F2]], inlinedAt: [[fcs1_f4_f3cs1:![0-9]+]])
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; CHECK-DAG: [[fcs1_f4_f3cs1]] = {{.*}}, scope: [[F3]], inlinedAt: [[fcs1_f4:![0-9]+]])
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; CHECK-DAG: [[fcs1_f4]] = {{.*}}, scope: [[F4]], inlinedAt: [[fcs1:![0-9]+]])
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; CHECK-DAG: [[fcs1]] = {{.*}}, scope: [[F]])
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; CHECK-DAG: [[fcs1_f4_f3cs2_f2]] = {{.*}}, scope: [[F2]], inlinedAt: [[fcs1_f4_f3cs2:![0-9]+]])
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; CHECK-DAG: [[fcs1_f4_f3cs2]] = {{.*}}, scope: [[F3]], inlinedAt: [[fcs1_f4]])
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; CHECK-DAG: [[fcs2_f4_f3cs1_f2]] = {{.*}}, scope: [[F2]], inlinedAt: [[fcs2_f4_f3cs1:![0-9]+]])
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; CHECK-DAG: [[fcs2_f4_f3cs1]] = {{.*}}, scope: [[F3]], inlinedAt: [[fcs2_f4:![0-9]+]])
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; CHECK-DAG: [[fcs2_f4]] = {{.*}}, scope: [[F4]], inlinedAt: [[fcs2:![0-9]+]])
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; CHECK-DAG: [[fcs2]] = {{.*}}, scope: [[F]])
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; CHECK-DAG: [[fcs2_f4_f3cs2_f2]] = {{.*}}, scope: [[F2]], inlinedAt: [[fcs2_f4_f3cs2:![0-9]+]])
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; CHECK-DAG: [[fcs2_f4_f3cs2]] = {{.*}}, scope: [[F3]], inlinedAt: [[fcs2_f4]])
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$_Z2f4v = comdat any
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$_Z2f3v = comdat any
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$_Z2f2v = comdat any
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; Function Attrs: uwtable
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define void @_Z1fv() #0 !dbg !4 {
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entry:
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call void @_Z2f4v(), !dbg !13
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call void @_Z2f4v(), !dbg !13
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ret void, !dbg !14
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}
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; Function Attrs: alwaysinline inlinehint uwtable
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define linkonce_odr void @_Z2f4v() #1 comdat !dbg !7 {
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entry:
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call void @_Z2f3v(), !dbg !15
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ret void, !dbg !16
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}
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; Function Attrs: alwaysinline inlinehint uwtable
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define linkonce_odr void @_Z2f3v() #1 comdat !dbg !8 {
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entry:
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call void @_Z2f2v(), !dbg !17
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call void @_Z2f2v(), !dbg !17
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ret void, !dbg !18
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}
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; Function Attrs: alwaysinline inlinehint uwtable
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define linkonce_odr void @_Z2f2v() #1 comdat !dbg !9 {
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entry:
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call void @_Z2f1v(), !dbg !19
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ret void, !dbg !20
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}
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declare void @_Z2f1v() #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 = { alwaysinline inlinehint 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 #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 = !{!10, !11}
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!llvm.ident = !{!12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 226474) (llvm/trunk 226478)", isOptimized: false, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "debug-info-duplicate-calls.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", line: 13, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 13, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "debug-info-duplicate-calls.cpp", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !2)
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!7 = distinct !DISubprogram(name: "f4", line: 10, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 10, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!8 = distinct !DISubprogram(name: "f3", line: 7, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!9 = distinct !DISubprogram(name: "f2", line: 4, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{!"clang version 3.7.0 (trunk 226474) (llvm/trunk 226478)"}
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!13 = !DILocation(line: 14, column: 3, scope: !4)
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!14 = !DILocation(line: 15, column: 1, scope: !4)
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!15 = !DILocation(line: 11, column: 3, scope: !7)
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!16 = !DILocation(line: 12, column: 1, scope: !7)
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!17 = !DILocation(line: 8, column: 3, scope: !8)
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!18 = !DILocation(line: 9, column: 1, scope: !8)
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!19 = !DILocation(line: 5, column: 3, scope: !9)
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!20 = !DILocation(line: 6, column: 1, scope: !9)
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