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llvm-mirror/test/DebugInfo/X86/sroasplit-2.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

100 lines
4.9 KiB
LLVM
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; RUN: opt %s -sroa -verify -S -o - | FileCheck %s
;
; Test that we can partial emit debug info for aggregates repeatedly
; split up by SROA.
;
; // Compile with -O1
; typedef struct {
; int a;
; int b;
; } Inner;
;
; typedef struct {
; Inner inner[2];
; } Outer;
;
; int foo(Outer outer) {
; Inner i1 = outer.inner[1];
; return i1.a;
; }
;
; Verify that SROA creates a variable piece when splitting i1.
; CHECK: call void @llvm.dbg.value(metadata i64 %outer.coerce0, metadata ![[O:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)),
; CHECK: call void @llvm.dbg.value(metadata i32 {{.*}}, metadata ![[O]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 32)),
; CHECK: call void @llvm.dbg.value(metadata i32 {{.*}}, metadata ![[O]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32)),
; CHECK: call void @llvm.dbg.value({{.*}}, metadata ![[I1:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)),
; CHECK-DAG: ![[O]] = !DILocalVariable(name: "outer",{{.*}} line: 10
; CHECK-DAG: ![[I1]] = !DILocalVariable(name: "i1",{{.*}} line: 11
; ModuleID = 'sroasplit-2.c'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9.0"
%struct.Outer = type { [2 x %struct.Inner] }
%struct.Inner = type { i32, i32 }
; Function Attrs: nounwind ssp uwtable
define i32 @foo(i64 %outer.coerce0, i64 %outer.coerce1) #0 !dbg !4 {
%outer = alloca %struct.Outer, align 8
%i1 = alloca %struct.Inner, align 4
%1 = bitcast %struct.Outer* %outer to { i64, i64 }*
%2 = getelementptr { i64, i64 }, { i64, i64 }* %1, i32 0, i32 0
store i64 %outer.coerce0, i64* %2
%3 = getelementptr { i64, i64 }, { i64, i64 }* %1, i32 0, i32 1
store i64 %outer.coerce1, i64* %3
call void @llvm.dbg.declare(metadata %struct.Outer* %outer, metadata !24, metadata !2), !dbg !25
call void @llvm.dbg.declare(metadata %struct.Inner* %i1, metadata !26, metadata !2), !dbg !27
%4 = getelementptr inbounds %struct.Outer, %struct.Outer* %outer, i32 0, i32 0, !dbg !27
%5 = getelementptr inbounds [2 x %struct.Inner], [2 x %struct.Inner]* %4, i32 0, i64 1, !dbg !27
%6 = bitcast %struct.Inner* %i1 to i8*, !dbg !27
%7 = bitcast %struct.Inner* %5 to i8*, !dbg !27
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %6, i8* align 4 %7, i64 8, i1 false), !dbg !27
%8 = getelementptr inbounds %struct.Inner, %struct.Inner* %i1, i32 0, i32 0, !dbg !28
%9 = load i32, i32* %8, align 4, !dbg !28
ret i32 %9, !dbg !28
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1) #2
attributes #0 = { nounwind ssp uwtable "no-frame-pointer-elim"="true" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!21, !22}
!llvm.ident = !{!23}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !{}, retainedTypes: !{}, globals: !{}, imports: !{})
!1 = !DIFile(filename: "sroasplit-2.c", directory: "")
!2 = !DIExpression()
!4 = distinct !DISubprogram(name: "foo", line: 10, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 10, file: !1, scope: !5, type: !6, retainedNodes: !{})
!5 = !DIFile(filename: "sroasplit-2.c", directory: "")
!6 = !DISubroutineType(types: !7)
!7 = !{!8, !9}
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !DIDerivedType(tag: DW_TAG_typedef, name: "Outer", line: 8, file: !1, baseType: !10)
!10 = !DICompositeType(tag: DW_TAG_structure_type, line: 6, size: 128, align: 32, file: !1, elements: !11)
!11 = !{!12}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "inner", line: 7, size: 128, align: 32, file: !1, scope: !10, baseType: !13)
!13 = !DICompositeType(tag: DW_TAG_array_type, size: 128, align: 32, baseType: !14, elements: !19)
!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "Inner", line: 4, file: !1, baseType: !15)
!15 = !DICompositeType(tag: DW_TAG_structure_type, line: 1, size: 64, align: 32, file: !1, elements: !16)
!16 = !{!17, !18}
!17 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 2, size: 32, align: 32, file: !1, scope: !15, baseType: !8)
!18 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 3, size: 32, align: 32, offset: 32, file: !1, scope: !15, baseType: !8)
!19 = !{!20}
!20 = !DISubrange(count: 2)
!21 = !{i32 2, !"Dwarf Version", i32 2}
!22 = !{i32 1, !"Debug Info Version", i32 3}
!23 = !{!"clang version 3.5.0 "}
!24 = !DILocalVariable(name: "outer", line: 10, arg: 1, scope: !4, file: !5, type: !9)
!25 = !DILocation(line: 10, scope: !4)
!26 = !DILocalVariable(name: "i1", line: 11, scope: !4, file: !5, type: !14)
!27 = !DILocation(line: 11, scope: !4)
!28 = !DILocation(line: 12, scope: !4)
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