94 lines
2.9 KiB
LLVM
94 lines
2.9 KiB
LLVM
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; RUN: llc -mtriple=x86_64-linux-gnu -filetype=asm %s -o - | FileCheck %s
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; The prologue-end line record must be emitted after the last instruction that
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; is part of the function frame setup code and before the instruction that marks
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; the beginning of the function body.
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;
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; For the given test, generated from:
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;
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; 1 extern int get_arg();
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; 2 extern void func(int x);
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; 3
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; 4 int main()
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; 5 {
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; 6 int a;
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; 7 func(get_arg());
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; 8 }
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; 9
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; The prologue-end line record is emitted with an incorrect associated address,
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; which causes a debugger to show the beginning of function body to be inside
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; the prologue.
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; This can be seen in the following trimmed assembler output:
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;
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; main:
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; ...
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; # %bb.0:
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; .loc 1 7 0 prologue_end
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; pushq %rax
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; .cfi_def_cfa_offset 16
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; callq _Z7get_argv
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; ...
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; retq
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; The instruction 'pushq %rax' is part of the frame setup code.
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; The correct location for the prologue-end line information is just before
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; the call to '_Z7get_argv', as illustrated in the following trimmed
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; assembler output:
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;
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; main:
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; ...
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; # %bb.0:
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; pushq %rax
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; .cfi_def_cfa_offset 16
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; .loc 1 7 0 prologue_end
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; callq _Z7get_argv
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; ...
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; retq
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; Check that the generated assembler matches the following sequence:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: .loc 1 7 8 prologue_end {{.*}}# invalid-prologue-end.cpp:7:8
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; CHECK-NEXT: callq _Z7get_argv
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define i32 @main() #0 !dbg !7 {
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entry:
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%a = alloca i32, align 4
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call void @llvm.dbg.declare(metadata i32* %a, metadata !11, metadata !DIExpression()), !dbg !12
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%call = call i32 @_Z7get_argv(), !dbg !13
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call void @_Z4funci(i32 %call), !dbg !14
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ret i32 0, !dbg !15
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @_Z4funci(i32) #2
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declare i32 @_Z7get_argv() #2
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 7.0.0 (trunk 322269)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "invalid-prologue-end.cpp", directory: "/home/carlos/llvm-root/work")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 7.0.0 (trunk 322269)"}
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!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 4, type: !8, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "a", scope: !7, file: !1, line: 6, type: !10)
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!12 = !DILocation(line: 6, column: 7, scope: !7)
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!13 = !DILocation(line: 7, column: 8, scope: !7)
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!14 = !DILocation(line: 7, column: 3, scope: !7)
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!15 = !DILocation(line: 8, column: 1, scope: !7)
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