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clang-p2996/llvm/test/DebugInfo/Generic/incorrect-variable-debugloc.ll
Shiva Chen 2c864551df [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
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
2018-05-09 02:40:45 +00:00

391 lines
15 KiB
LLVM
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; REQUIRES: object-emission
; RUN: %llc_dwarf -O2 -filetype=obj < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s
; This is a test case that's as reduced as I can get it, though I haven't fully
; understood the mechanisms by which this bug occurs, so perhaps there's further
; simplification to be had (it's certainly a bit non-obvious what's going on). I
; hesitate to hand-craft or otherwise simplify the IR compared to what Clang
; generates as this is a particular tickling of optimizations and debug location
; propagation I want a realistic example of.
; Generated with clang-tot -cc1 -g -O2 -w -std=c++11 -fsanitize=address,use-after-return -fcxx-exceptions -fexceptions -x c++ incorrect-variable-debug-loc.cpp -emit-llvm
; struct A {
; int m_fn1();
; };
;
; struct B {
; void __attribute__((always_inline)) m_fn2() { i = 0; }
; int i;
; };
;
; struct C {
; void m_fn3();
; int j;
; B b;
; };
;
; int fn1() {
; C A;
; A.b.m_fn2();
; A.m_fn3();
; }
; void C::m_fn3() {
; A().m_fn1();
; b.m_fn2();
; }
; CHECK: DW_TAG_structure_type
; CHECK-NEXT: DW_AT_name {{.*}} "C"
; CHECK: [[M_FN3_DECL:.*]]: DW_TAG_subprogram
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_AT_name {{.*}} "m_fn3"
; CHECK: DW_AT_specification {{.*}} {[[M_FN3_DECL]]}
; CHECK-NOT: DW_TAG
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "this"
%struct.C = type { i32, %struct.B }
%struct.B = type { i32 }
%struct.A = type { i8 }
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 1, void ()* @asan.module_ctor }]
@__asan_option_detect_stack_use_after_return = external global i32
@__asan_gen_ = private unnamed_addr constant [11 x i8] c"1 32 8 1 A\00", align 1
@__asan_gen_1 = private unnamed_addr constant [13 x i8] c"1 32 1 3 tmp\00", align 1
; Function Attrs: noreturn sanitize_address
define i32 @_Z3fn1v() #0 !dbg !22 {
entry:
%MyAlloca = alloca [64 x i8], align 32, !dbg !39
%0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !39
%1 = load i32, i32* @__asan_option_detect_stack_use_after_return, !dbg !39
%2 = icmp ne i32 %1, 0, !dbg !39
br i1 %2, label %3, label %5
; <label>:3 ; preds = %entry
%4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !39
br label %5
; <label>:5 ; preds = %entry, %3
%6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !39
%7 = add i64 %6, 32, !dbg !39
%8 = inttoptr i64 %7 to %struct.C*, !dbg !39
%9 = inttoptr i64 %6 to i64*, !dbg !39
store i64 1102416563, i64* %9, !dbg !39
%10 = add i64 %6, 8, !dbg !39
%11 = inttoptr i64 %10 to i64*, !dbg !39
store i64 ptrtoint ([11 x i8]* @__asan_gen_ to i64), i64* %11, !dbg !39
%12 = add i64 %6, 16, !dbg !39
%13 = inttoptr i64 %12 to i64*, !dbg !39
store i64 ptrtoint (i32 ()* @_Z3fn1v to i64), i64* %13, !dbg !39
%14 = lshr i64 %6, 3, !dbg !39
%15 = add i64 %14, 2147450880, !dbg !39
%16 = add i64 %15, 0, !dbg !39
%17 = inttoptr i64 %16 to i64*, !dbg !39
store i64 -868083117767659023, i64* %17, !dbg !39
%i.i = getelementptr inbounds %struct.C, %struct.C* %8, i64 0, i32 1, i32 0, !dbg !39
%18 = ptrtoint i32* %i.i to i64, !dbg !39
%19 = lshr i64 %18, 3, !dbg !39
%20 = add i64 %19, 2147450880, !dbg !39
%21 = inttoptr i64 %20 to i8*, !dbg !39
%22 = load i8, i8* %21, !dbg !39
%23 = icmp ne i8 %22, 0, !dbg !39
br i1 %23, label %24, label %30, !dbg !39
; <label>:24 ; preds = %5
%25 = and i64 %18, 7, !dbg !39
%26 = add i64 %25, 3, !dbg !39
%27 = trunc i64 %26 to i8, !dbg !39
%28 = icmp sge i8 %27, %22, !dbg !39
br i1 %28, label %29, label %30
; <label>:29 ; preds = %24
call void @__asan_report_store4(i64 %18), !dbg !39
call void asm sideeffect "", ""()
unreachable
; <label>:30 ; preds = %24, %5
store i32 0, i32* %i.i, align 4, !dbg !39, !tbaa !41
tail call void @llvm.dbg.value(metadata %struct.C* %8, metadata !27, metadata !DIExpression(DW_OP_deref)), !dbg !46
call void @_ZN1C5m_fn3Ev(%struct.C* %8), !dbg !47
unreachable, !dbg !47
}
; Function Attrs: sanitize_address
define void @_ZN1C5m_fn3Ev(%struct.C* nocapture %this) #1 align 2 !dbg !28 {
entry:
%MyAlloca = alloca [64 x i8], align 32, !dbg !48
%0 = ptrtoint [64 x i8]* %MyAlloca to i64, !dbg !48
%1 = load i32, i32* @__asan_option_detect_stack_use_after_return, !dbg !48
%2 = icmp ne i32 %1, 0, !dbg !48
br i1 %2, label %3, label %5
; <label>:3 ; preds = %entry
%4 = call i64 @__asan_stack_malloc_0(i64 64, i64 %0), !dbg !48
br label %5
; <label>:5 ; preds = %entry, %3
%6 = phi i64 [ %0, %entry ], [ %4, %3 ], !dbg !48
%7 = add i64 %6, 32, !dbg !48
%8 = inttoptr i64 %7 to %struct.A*, !dbg !48
%9 = inttoptr i64 %6 to i64*, !dbg !48
store i64 1102416563, i64* %9, !dbg !48
%10 = add i64 %6, 8, !dbg !48
%11 = inttoptr i64 %10 to i64*, !dbg !48
store i64 ptrtoint ([13 x i8]* @__asan_gen_1 to i64), i64* %11, !dbg !48
%12 = add i64 %6, 16, !dbg !48
%13 = inttoptr i64 %12 to i64*, !dbg !48
store i64 ptrtoint (void (%struct.C*)* @_ZN1C5m_fn3Ev to i64), i64* %13, !dbg !48
%14 = lshr i64 %6, 3, !dbg !48
%15 = add i64 %14, 2147450880, !dbg !48
%16 = add i64 %15, 0, !dbg !48
%17 = inttoptr i64 %16 to i64*, !dbg !48
store i64 -868083113472691727, i64* %17, !dbg !48
tail call void @llvm.dbg.value(metadata %struct.C* %this, metadata !30, metadata !DIExpression()), !dbg !48
%call = call i32 @_ZN1A5m_fn1Ev(%struct.A* %8), !dbg !49
%i.i = getelementptr inbounds %struct.C, %struct.C* %this, i64 0, i32 1, i32 0, !dbg !50
%18 = ptrtoint i32* %i.i to i64, !dbg !50
%19 = lshr i64 %18, 3, !dbg !50
%20 = add i64 %19, 2147450880, !dbg !50
%21 = inttoptr i64 %20 to i8*, !dbg !50
%22 = load i8, i8* %21, !dbg !50
%23 = icmp ne i8 %22, 0, !dbg !50
br i1 %23, label %24, label %30, !dbg !50
; <label>:24 ; preds = %5
%25 = and i64 %18, 7, !dbg !50
%26 = add i64 %25, 3, !dbg !50
%27 = trunc i64 %26 to i8, !dbg !50
%28 = icmp sge i8 %27, %22, !dbg !50
br i1 %28, label %29, label %30
; <label>:29 ; preds = %24
call void @__asan_report_store4(i64 %18), !dbg !50
call void asm sideeffect "", ""()
unreachable
; <label>:30 ; preds = %24, %5
store i32 0, i32* %i.i, align 4, !dbg !50, !tbaa !41
store i64 1172321806, i64* %9, !dbg !52
%31 = icmp ne i64 %6, %0, !dbg !52
br i1 %31, label %32, label %39, !dbg !52
; <label>:32 ; preds = %30
%33 = add i64 %15, 0, !dbg !52
%34 = inttoptr i64 %33 to i64*, !dbg !52
store i64 -723401728380766731, i64* %34, !dbg !52
%35 = add i64 %6, 56, !dbg !52
%36 = inttoptr i64 %35 to i64*, !dbg !52
%37 = load i64, i64* %36, !dbg !52
%38 = inttoptr i64 %37 to i8*, !dbg !52
store i8 0, i8* %38, !dbg !52
br label %42, !dbg !52
; <label>:39 ; preds = %30
%40 = add i64 %15, 0, !dbg !52
%41 = inttoptr i64 %40 to i64*, !dbg !52
store i64 0, i64* %41, !dbg !52
br label %42, !dbg !52
; <label>:42 ; preds = %39, %32
ret void, !dbg !52
}
declare i32 @_ZN1A5m_fn1Ev(%struct.A*) #2
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #3
define internal void @asan.module_ctor() {
tail call void @__asan_init_v3()
ret void
}
declare void @__asan_init_v3()
declare void @__asan_report_load1(i64)
declare void @__asan_load1(i64)
declare void @__asan_report_load2(i64)
declare void @__asan_load2(i64)
declare void @__asan_report_load4(i64)
declare void @__asan_load4(i64)
declare void @__asan_report_load8(i64)
declare void @__asan_load8(i64)
declare void @__asan_report_load16(i64)
declare void @__asan_load16(i64)
declare void @__asan_report_store1(i64)
declare void @__asan_store1(i64)
declare void @__asan_report_store2(i64)
declare void @__asan_store2(i64)
declare void @__asan_report_store4(i64)
declare void @__asan_store4(i64)
declare void @__asan_report_store8(i64)
declare void @__asan_store8(i64)
declare void @__asan_report_store16(i64)
declare void @__asan_store16(i64)
declare void @__asan_report_load_n(i64, i64)
declare void @__asan_report_store_n(i64, i64)
declare void @__asan_loadN(i64, i64)
declare void @__asan_storeN(i64, i64)
declare i8* @__asan_memmove(i8*, i8*, i64)
declare i8* @__asan_memcpy(i8*, i8*, i64)
declare i8* @__asan_memset(i8*, i32, i64)
declare void @__asan_handle_no_return()
declare void @__sanitizer_cov()
declare void @__sanitizer_ptr_cmp(i64, i64)
declare void @__sanitizer_ptr_sub(i64, i64)
declare i64 @__asan_stack_malloc_0(i64, i64)
declare void @__asan_stack_free_0(i64, i64, i64)
declare i64 @__asan_stack_malloc_1(i64, i64)
declare void @__asan_stack_free_1(i64, i64, i64)
declare i64 @__asan_stack_malloc_2(i64, i64)
declare void @__asan_stack_free_2(i64, i64, i64)
declare i64 @__asan_stack_malloc_3(i64, i64)
declare void @__asan_stack_free_3(i64, i64, i64)
declare i64 @__asan_stack_malloc_4(i64, i64)
declare void @__asan_stack_free_4(i64, i64, i64)
declare i64 @__asan_stack_malloc_5(i64, i64)
declare void @__asan_stack_free_5(i64, i64, i64)
declare i64 @__asan_stack_malloc_6(i64, i64)
declare void @__asan_stack_free_6(i64, i64, i64)
declare i64 @__asan_stack_malloc_7(i64, i64)
declare void @__asan_stack_free_7(i64, i64, i64)
declare i64 @__asan_stack_malloc_8(i64, i64)
declare void @__asan_stack_free_8(i64, i64, i64)
declare i64 @__asan_stack_malloc_9(i64, i64)
declare void @__asan_stack_free_9(i64, i64, i64)
declare i64 @__asan_stack_malloc_10(i64, i64)
declare void @__asan_stack_free_10(i64, i64, i64)
declare void @__asan_poison_stack_memory(i64, i64)
declare void @__asan_unpoison_stack_memory(i64, i64)
declare void @__asan_before_dynamic_init(i64)
declare void @__asan_after_dynamic_init()
declare void @__asan_register_globals(i64, i64)
declare void @__asan_unregister_globals(i64, i64)
declare void @__sanitizer_cov_module_init(i64)
attributes #0 = { noreturn sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!36, !37}
!llvm.ident = !{!38}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "<stdin>", directory: "/tmp/dbginfo")
!2 = !{}
!3 = !{!4, !14}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "C", line: 10, size: 64, align: 32, file: !5, elements: !6, identifier: "_ZTS1C")
!5 = !DIFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo")
!6 = !{!7, !9, !10}
!7 = !DIDerivedType(tag: DW_TAG_member, name: "j", line: 12, size: 32, align: 32, file: !5, scope: !4, baseType: !8)
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 13, size: 32, align: 32, offset: 32, file: !5, scope: !4, baseType: !14)
!10 = !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 11, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !5, scope: !4, type: !11)
!11 = !DISubroutineType(types: !12)
!12 = !{null, !13}
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !4)
!14 = !DICompositeType(tag: DW_TAG_structure_type, name: "B", line: 5, size: 32, align: 32, file: !5, elements: !15, identifier: "_ZTS1B")
!15 = !{!16, !17}
!16 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 7, size: 32, align: 32, file: !5, scope: !14, baseType: !8)
!17 = !DISubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 6, file: !5, scope: !14, type: !18)
!18 = !DISubroutineType(types: !19)
!19 = !{null, !20}
!20 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !14)
!22 = distinct !DISubprogram(name: "fn1", linkageName: "_Z3fn1v", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 16, file: !5, scope: !23, type: !24, retainedNodes: !26)
!23 = !DIFile(filename: "incorrect-variable-debug-loc.cpp", directory: "/tmp/dbginfo")
!24 = !DISubroutineType(types: !25)
!25 = !{!8}
!26 = !{!27}
!27 = !DILocalVariable(name: "A", line: 17, scope: !22, file: !23, type: !4)
!28 = distinct !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", line: 21, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 21, file: !5, scope: !4, type: !11, declaration: !10, retainedNodes: !29)
!29 = !{!30}
!30 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !28, type: !31)
!31 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !4)
!32 = distinct !DISubprogram(name: "m_fn2", linkageName: "_ZN1B5m_fn2Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 6, file: !5, scope: !14, type: !18, declaration: !17, retainedNodes: !33)
!33 = !{!34}
!34 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !32, type: !35)
!35 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !14)
!36 = !{i32 2, !"Dwarf Version", i32 4}
!37 = !{i32 2, !"Debug Info Version", i32 3}
!38 = !{!"clang version 3.5.0 "}
!39 = !DILocation(line: 6, scope: !32, inlinedAt: !40)
!40 = !DILocation(line: 18, scope: !22)
!41 = !{!42, !43, i64 0}
!42 = !{!"struct", !43, i64 0}
!43 = !{!"int", !44, i64 0}
!44 = !{!"omnipotent char", !45, i64 0}
!45 = !{!"Simple C/C++ TBAA"}
!46 = !DILocation(line: 17, scope: !22)
!47 = !DILocation(line: 19, scope: !22)
!48 = !DILocation(line: 0, scope: !28)
!49 = !DILocation(line: 22, scope: !28)
!50 = !DILocation(line: 6, scope: !32, inlinedAt: !51)
!51 = !DILocation(line: 23, scope: !28)
!52 = !DILocation(line: 24, scope: !28)
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