如何在Clang中使用llvm ir发出调试信息？

clang -g -emit-llvm -c your_code.c -o your_code.bc

llvm-dis your_code.bc -o your_code.ll

; ModuleID = 'your_code.c'
source_filename = "your_code.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "your_code.c", directory: "/path/to/your/code")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 10.0.0"}

; ModuleID = 'example'
source_filename = "example.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@.str = private unnamed_addr constant [13 x i8] c"Hello, world\00", align 1

define i32 @main() !dbg !5 {
entry:
  %0 = alloca i32, align 4
  %1 = alloca i32, align 4
  store i32 0, i32* %0, align 4
  call void @llvm.dbg.declare(metadata i32* %0, metadata !10, metadata !11), !dbg !12
  %2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i32 0, i32 0)), !dbg !13
  store i32 %2, i32* %1, align 4
  call void @llvm.dbg.declare(metadata i32* %1, metadata !14, metadata !11), !dbg !15
  %3 = load i32, i32* %1, align 4, !dbg !16
  ret i32 %3, !dbg !17
}

declare i32 @printf(i8*, ...) #1

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}

!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "example.c", directory: "/path/to/your/code")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 10.0.0"}
!10 = !DILocalVariable(name: "retval", scope: !6, file: !1, line: 1, type: !7)
!11 = !DIExpression()
!12 = !DILocation(line: 1, column: 1, scope: !6)
!13 = !DILocation(line: 2, column: 1, scope: !6)
!14 = !DILocalVariable(name: "result", scope: !6, file: !1, line: 2, type: !7)
!15 = !DILocation(line: 2, column: 1, scope: !6)
!16 = !DILocation(line: 3, column: 1, scope: !6)
!17 = !DILocation(line: 4, column: 1, scope: !6)
!6 = distinct !DISubprogram(name: "main", linkageName: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!8 = !DISubroutineType(types: !9)
!9 = !{!7}

# 使用 Clang 生成可执行文件
clang -g your_code.c -o your_executable

# 使用 GDB 调试
gdb your_executable

# 使用 LLDB 调试
lldb your_executable