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llvm-mirror/test/DebugInfo/X86/pr19307.ll
Shiva Chen a2029fa58e [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

145 lines
8.9 KiB
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; RUN: llc -O0 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
; Generated from the source file pr19307.cc:
; #include <string>
; void parse_range(unsigned long long &offset, unsigned long long &limit,
; std::string range) {
; if (range.compare(0, 6, "items=") != 0 || range[6] == '-')
; offset = 1;
; range.erase(0, 6);
; limit = 2;
; }
; with "clang++ -S -emit-llvm -O0 -g pr19307.cc"
; Location of "range" string is spilled from %rdx to stack and is
; addressed via %rbp.
; CHECK: movq %rdx, {{[-0-9]+}}(%rbp)
; CHECK-NEXT: [[START_LABEL:.Ltmp[0-9]+]]:
; This location should be valid until the end of the function.
; Verify that we have proper range in debug_loc section:
; CHECK: .Ldebug_loc{{[0-9]+}}:
; CHECK: DW_OP_breg1
; CHECK: .quad [[START_LABEL]]-.Lfunc_begin0
; CHECK-NEXT: .quad .Lfunc_end0-.Lfunc_begin0
; CHECK: DW_OP_breg6
; CHECK: DW_OP_deref
; ModuleID = 'pr19307.cc'
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%"class.std::basic_string" = type { %"struct.std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider" }
%"struct.std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider" = type { i8* }
@.str = private unnamed_addr constant [7 x i8] c"items=\00", align 1
; Function Attrs: uwtable
define void @_Z11parse_rangeRyS_Ss(i64* %offset, i64* %limit, %"class.std::basic_string"* %range) #0 !dbg !13 {
entry:
%offset.addr = alloca i64*, align 8
%limit.addr = alloca i64*, align 8
store i64* %offset, i64** %offset.addr, align 8
call void @llvm.dbg.declare(metadata i64** %offset.addr, metadata !45, metadata !DIExpression()), !dbg !46
store i64* %limit, i64** %limit.addr, align 8
call void @llvm.dbg.declare(metadata i64** %limit.addr, metadata !47, metadata !DIExpression()), !dbg !46
call void @llvm.dbg.declare(metadata %"class.std::basic_string"* %range, metadata !48, metadata !DIExpression(DW_OP_deref)), !dbg !49
%call = call i32 @_ZNKSs7compareEmmPKc(%"class.std::basic_string"* %range, i64 0, i64 6, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i32 0, i32 0)), !dbg !50
%cmp = icmp ne i32 %call, 0, !dbg !50
br i1 %cmp, label %if.then, label %lor.lhs.false, !dbg !50
lor.lhs.false: ; preds = %entry
%call1 = call i8* @_ZNSsixEm(%"class.std::basic_string"* %range, i64 6), !dbg !52
%0 = load i8, i8* %call1, !dbg !52
%conv = sext i8 %0 to i32, !dbg !52
%cmp2 = icmp eq i32 %conv, 45, !dbg !52
br i1 %cmp2, label %if.then, label %if.end, !dbg !52
if.then: ; preds = %lor.lhs.false, %entry
%1 = load i64*, i64** %offset.addr, align 8, !dbg !54
store i64 1, i64* %1, align 8, !dbg !54
br label %if.end, !dbg !54
if.end: ; preds = %if.then, %lor.lhs.false
%call3 = call %"class.std::basic_string"* @_ZNSs5eraseEmm(%"class.std::basic_string"* %range, i64 0, i64 6), !dbg !55
%2 = load i64*, i64** %limit.addr, align 8, !dbg !56
store i64 2, i64* %2, align 8, !dbg !56
ret void, !dbg !57
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare i32 @_ZNKSs7compareEmmPKc(%"class.std::basic_string"*, i64, i64, i8*) #2
declare i8* @_ZNSsixEm(%"class.std::basic_string"*, i64) #2
declare %"class.std::basic_string"* @_ZNSs5eraseEmm(%"class.std::basic_string"*, i64, i64) #2
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" }
attributes #1 = { nounwind readnone }
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" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!42, !43}
!llvm.ident = !{!44}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 (209308)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !21)
!1 = !DIFile(filename: "pr19307.cc", directory: "/llvm_cmake_gcc")
!2 = !{}
!3 = !{!4, !6, !8}
!4 = !DICompositeType(tag: DW_TAG_structure_type, line: 83, flags: DIFlagFwdDecl, file: !5, identifier: "_ZTS11__mbstate_t")
!5 = !DIFile(filename: "/usr/include/wchar.h", directory: "/llvm_cmake_gcc")
!6 = !DICompositeType(tag: DW_TAG_structure_type, name: "lconv", line: 54, flags: DIFlagFwdDecl, file: !7, identifier: "_ZTS5lconv")
!7 = !DIFile(filename: "/usr/include/locale.h", directory: "/llvm_cmake_gcc")
!8 = !DICompositeType(tag: DW_TAG_class_type, name: "basic_string<char, std::char_traits<char>, std::allocator<char> >", line: 1134, flags: DIFlagFwdDecl, file: !9, scope: !10, identifier: "_ZTSSs")
!9 = !DIFile(filename: "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/bits/basic_string.tcc", directory: "/llvm_cmake_gcc")
!10 = !DINamespace(name: "std", scope: null)
!11 = !DIFile(filename: "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/x86_64-linux-gnu/bits/c++config.h", directory: "/llvm_cmake_gcc")
!13 = distinct !DISubprogram(name: "parse_range", linkageName: "_Z11parse_rangeRyS_Ss", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !14, type: !15, retainedNodes: !2)
!14 = !DIFile(filename: "pr19307.cc", directory: "/llvm_cmake_gcc")
!15 = !DISubroutineType(types: !16)
!16 = !{null, !17, !17, !19}
!17 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !18)
!18 = !DIBasicType(tag: DW_TAG_base_type, name: "long long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
!19 = !DIDerivedType(tag: DW_TAG_typedef, name: "string", line: 65, file: !20, scope: !10, baseType: !8)
!20 = !DIFile(filename: "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/bits/stringfwd.h", directory: "/llvm_cmake_gcc")
!21 = !{!22, !26, !29, !33, !38, !41}
!22 = !DIImportedEntity(tag: DW_TAG_imported_module, file: !1, line: 57, scope: !23, entity: !25)
!23 = !DINamespace(name: "__gnu_debug", scope: null)
!24 = !DIFile(filename: "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/debug/debug.h", directory: "/llvm_cmake_gcc")
!25 = !DINamespace(name: "__debug", scope: !10)
!26 = !DIImportedEntity(tag: DW_TAG_imported_declaration, file: !1, line: 66, scope: !10, entity: !27)
!27 = !DIDerivedType(tag: DW_TAG_typedef, name: "mbstate_t", line: 106, file: !5, baseType: !28)
!28 = !DIDerivedType(tag: DW_TAG_typedef, name: "__mbstate_t", line: 95, file: !5, baseType: !4)
!29 = !DIImportedEntity(tag: DW_TAG_imported_declaration, file: !1, line: 141, scope: !10, entity: !30)
!30 = !DIDerivedType(tag: DW_TAG_typedef, name: "wint_t", line: 141, file: !31, baseType: !32)
!31 = !DIFile(filename: "/llvm_cmake_gcc/bin/../lib/clang/3.5.0/include/stddef.h", directory: "/llvm_cmake_gcc")
!32 = !DIBasicType(tag: DW_TAG_base_type, name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
!33 = !DIImportedEntity(tag: DW_TAG_imported_declaration, file: !1, line: 42, scope: !34, entity: !36)
!34 = !DINamespace(name: "__gnu_cxx", scope: null)
!35 = !DIFile(filename: "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/bits/cpp_type_traits.h", directory: "/llvm_cmake_gcc")
!36 = !DIDerivedType(tag: DW_TAG_typedef, name: "size_t", line: 155, file: !11, scope: !10, baseType: !37)
!37 = !DIBasicType(tag: DW_TAG_base_type, name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
!38 = !DIImportedEntity(tag: DW_TAG_imported_declaration, file: !1, line: 43, scope: !34, entity: !39)
!39 = !DIDerivedType(tag: DW_TAG_typedef, name: "ptrdiff_t", line: 156, file: !11, scope: !10, baseType: !40)
!40 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
!41 = !DIImportedEntity(tag: DW_TAG_imported_declaration, file: !1, line: 55, scope: !10, entity: !6)
!42 = !{i32 2, !"Dwarf Version", i32 4}
!43 = !{i32 2, !"Debug Info Version", i32 3}
!44 = !{!"clang version 3.5.0 (209308)"}
!45 = !DILocalVariable(name: "offset", line: 3, arg: 1, scope: !13, file: !14, type: !17)
!46 = !DILocation(line: 3, scope: !13)
!47 = !DILocalVariable(name: "limit", line: 3, arg: 2, scope: !13, file: !14, type: !17)
!48 = !DILocalVariable(name: "range", line: 4, arg: 3, scope: !13, file: !14, type: !19)
!49 = !DILocation(line: 4, scope: !13)
!50 = !DILocation(line: 5, scope: !51)
!51 = distinct !DILexicalBlock(line: 5, column: 0, file: !1, scope: !13)
!52 = !DILocation(line: 5, scope: !53)
!53 = distinct !DILexicalBlock(line: 5, column: 0, file: !1, scope: !51)
!54 = !DILocation(line: 6, scope: !51)
!55 = !DILocation(line: 7, scope: !13)
!56 = !DILocation(line: 8, scope: !13)
!57 = !DILocation(line: 9, scope: !13)
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