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llvm-mirror/test/DebugInfo/X86/invalid-prologue-end.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

94 lines
2.9 KiB
LLVM

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