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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
73 lines
3.4 KiB
LLVM
73 lines
3.4 KiB
LLVM
; RUN: llvm-link %s %S/Inputs/replaced-function-matches-first-subprogram.ll -S | FileCheck %s
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; Generated from C++ source:
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;
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; // repro/t.h
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; template <class T> struct Class {
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; int foo() { return 0; }
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; };
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; // repro/d1/t1.cpp
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; #include "t.h"
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; int foo() { return Class<int>().foo(); }
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; // repro/d2/t2.cpp
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; #include "t.h"
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; template struct Class<int>;
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%struct.Class = type { i8 }
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; CHECK: define i32 @_Z3foov(){{.*}} !dbg ![[SP1:[0-9]+]]
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define i32 @_Z3foov() !dbg !4 {
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entry:
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%tmp = alloca %struct.Class, align 1
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%call = call i32 @_ZN5ClassIiE3fooEv(%struct.Class* %tmp), !dbg !14
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ret i32 %call, !dbg !14
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}
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; CHECK: define weak_odr i32 @_ZN5ClassIiE3fooEv(%struct.Class* %this){{.*}} !dbg ![[SP2:[0-9]+]] {
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; CHECK-NOT: }
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; CHECK: !dbg ![[LOC:[0-9]+]]
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define linkonce_odr i32 @_ZN5ClassIiE3fooEv(%struct.Class* %this) align 2 !dbg !7 {
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entry:
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%this.addr = alloca %struct.Class*, align 8
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store %struct.Class* %this, %struct.Class** %this.addr, align 8
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%this1 = load %struct.Class*, %struct.Class** %this.addr
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ret i32 0, !dbg !15
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}
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; CHECK: !llvm.dbg.cu = !{![[CU1:[0-9]+]], ![[CU2:[0-9]+]]}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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; Extract out the list of subprograms from each compile unit.
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; CHECK: ![[CU1:[0-9]+]] = distinct !DICompileUnit(
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; CHECK: ![[CU2:[0-9]+]] = distinct !DICompileUnit(
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 224193) (llvm/trunk 224197)", isOptimized: false, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "t1.cpp", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d1")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "t1.cpp", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d1")
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!6 = !DISubroutineType(types: !2)
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; Extract out the file from the replaced subprogram.
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; CHECK-DAG: ![[SP2:.*]] = distinct !DISubprogram({{.*}} file: ![[FILE:[0-9]+]],{{.*}}, unit: ![[CU2]]
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; We can't use CHECK-NOT/CHECK-SAME with a CHECK-DAG, so rely on field order to
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; prove that there's no function: here.
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; CHECK-DAG: ![[SP2r:.*]] = {{.*}}!DISubprogram({{.*}} isOptimized: false, unit: ![[CU1]], retainedNodes:
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!7 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !8, scope: !9, type: !6, retainedNodes: !2)
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; The new subprogram should be pointing at the new directory.
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; CHECK-DAG: ![[FILE]] = !DIFile(filename: "../t.h", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d2")
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!8 = !DIFile(filename: "../t.h", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d1")
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!9 = !DIFile(filename: "../t.h", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d1")
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!10 = !{i32 2, !"Dwarf Version", i32 2}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"PIC Level", i32 2}
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!13 = !{!"clang version 3.6.0 (trunk 224193) (llvm/trunk 224197)"}
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!14 = !DILocation(line: 2, column: 20, scope: !4)
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; The same subprogram should be pointed to by inside the !dbg reference.
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; CHECK: ![[LOC]] = !DILocation(line: 2, column: 15, scope: ![[SP2]])
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!15 = !DILocation(line: 2, column: 15, scope: !7)
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