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llvm-mirror/test/DebugInfo/X86/sroasplit-4.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

142 lines
6.4 KiB
LLVM
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; RUN: opt -sroa < %s -S -o - | FileCheck %s
;
; Test that recursively splitting an alloca updates the debug info correctly.
; CHECK: %[[T:.*]] = load i64, i64* @t, align 8
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T]], metadata ![[Y:.*]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64))
; CHECK: %[[T1:.*]] = load i64, i64* @t, align 8
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T1]], metadata ![[Y]], metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64))
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T]], metadata ![[R:.*]], metadata !DIExpression(DW_OP_LLVM_fragment, 192, 64))
; CHECK: call void @llvm.dbg.value(metadata i64 %[[T1]], metadata ![[R]], metadata !DIExpression(DW_OP_LLVM_fragment, 256, 64))
;
; struct p {
; __SIZE_TYPE__ s;
; __SIZE_TYPE__ t;
; };
;
; struct r {
; int i;
; struct p x;
; struct p y;
; };
;
; extern int call_me(struct r);
; extern int maybe();
; extern __SIZE_TYPE__ t;
;
; int test() {
; if (maybe())
; return 0;
; struct p y = {t, t};
; struct r r = {.y = y};
; return call_me(r);
; }
; ModuleID = 'pr22393.cc'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-darwin"
%struct.p = type { i64, i64 }
%struct.r = type { i32, %struct.p, %struct.p }
@t = external global i64
; Function Attrs: nounwind
define i32 @_Z4testv() #0 !dbg !17 {
entry:
%retval = alloca i32, align 4
%y = alloca %struct.p, align 8
%r = alloca %struct.r, align 8
%agg.tmp = alloca %struct.r, align 8
%call = call i32 @_Z5maybev(), !dbg !24
%tobool = icmp ne i32 %call, 0, !dbg !24
br i1 %tobool, label %if.then, label %if.end, !dbg !26
if.then: ; preds = %entry
store i32 0, i32* %retval, !dbg !27
br label %return, !dbg !27
if.end: ; preds = %entry
call void @llvm.dbg.declare(metadata %struct.p* %y, metadata !28, metadata !29), !dbg !30
%s = getelementptr inbounds %struct.p, %struct.p* %y, i32 0, i32 0, !dbg !30
%0 = load i64, i64* @t, align 8, !dbg !30
store i64 %0, i64* %s, align 8, !dbg !30
%t = getelementptr inbounds %struct.p, %struct.p* %y, i32 0, i32 1, !dbg !30
%1 = load i64, i64* @t, align 8, !dbg !30
store i64 %1, i64* %t, align 8, !dbg !30
call void @llvm.dbg.declare(metadata %struct.r* %r, metadata !31, metadata !29), !dbg !32
%i = getelementptr inbounds %struct.r, %struct.r* %r, i32 0, i32 0, !dbg !32
store i32 0, i32* %i, align 4, !dbg !32
%x = getelementptr inbounds %struct.r, %struct.r* %r, i32 0, i32 1, !dbg !32
%s1 = getelementptr inbounds %struct.p, %struct.p* %x, i32 0, i32 0, !dbg !32
store i64 0, i64* %s1, align 8, !dbg !32
%t2 = getelementptr inbounds %struct.p, %struct.p* %x, i32 0, i32 1, !dbg !32
store i64 0, i64* %t2, align 8, !dbg !32
%y3 = getelementptr inbounds %struct.r, %struct.r* %r, i32 0, i32 2, !dbg !32
%2 = bitcast %struct.p* %y3 to i8*, !dbg !32
%3 = bitcast %struct.p* %y to i8*, !dbg !32
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %2, i8* align 8 %3, i64 16, i1 false), !dbg !32
%4 = bitcast %struct.r* %agg.tmp to i8*, !dbg !33
%5 = bitcast %struct.r* %r to i8*, !dbg !33
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %4, i8* align 8 %5, i64 40, i1 false), !dbg !33
%call4 = call i32 @_Z7call_me1r(%struct.r* byval align 8 %agg.tmp), !dbg !33
store i32 %call4, i32* %retval, !dbg !33
br label %return, !dbg !33
return: ; preds = %if.end, %if.then
%6 = load i32, i32* %retval, !dbg !34
ret i32 %6, !dbg !34
}
declare i32 @_Z5maybev()
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
; Function Attrs: nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1) #3
declare i32 @_Z7call_me1r(%struct.r* byval align 8)
attributes #0 = { nounwind }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!21, !22}
!llvm.ident = !{!23}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "<stdin>", directory: "")
!2 = !{}
!3 = !{!4, !10}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "p", line: 3, size: 128, align: 64, file: !5, elements: !6, identifier: "_ZTS1p")
!5 = !DIFile(filename: "pr22393.cc", directory: "")
!6 = !{!7, !9}
!7 = !DIDerivedType(tag: DW_TAG_member, name: "s", line: 4, size: 64, align: 64, file: !5, scope: !4, baseType: !8)
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
!9 = !DIDerivedType(tag: DW_TAG_member, name: "t", line: 5, size: 64, align: 64, offset: 64, file: !5, scope: !4, baseType: !8)
!10 = !DICompositeType(tag: DW_TAG_structure_type, name: "r", line: 8, size: 320, align: 64, file: !5, elements: !11, identifier: "_ZTS1r")
!11 = !{!12, !14, !15}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 9, size: 32, align: 32, file: !5, scope: !10, baseType: !13)
!13 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!14 = !DIDerivedType(tag: DW_TAG_member, name: "x", line: 10, size: 128, align: 64, offset: 64, file: !5, scope: !10, baseType: !4)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "y", line: 11, size: 128, align: 64, offset: 192, file: !5, scope: !10, baseType: !4)
!17 = distinct !DISubprogram(name: "test", linkageName: "_Z4testv", line: 18, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 18, file: !5, scope: !18, type: !19, retainedNodes: !2)
!18 = !DIFile(filename: "pr22393.cc", directory: "")
!19 = !DISubroutineType(types: !20)
!20 = !{!13}
!21 = !{i32 2, !"Dwarf Version", i32 4}
!22 = !{i32 2, !"Debug Info Version", i32 3}
!23 = !{!"clang version 3.7.0 "}
!24 = !DILocation(line: 19, scope: !25)
!25 = distinct !DILexicalBlock(line: 19, column: 0, file: !5, scope: !17)
!26 = !DILocation(line: 19, scope: !17)
!27 = !DILocation(line: 20, scope: !25)
!28 = !DILocalVariable(name: "y", line: 21, scope: !17, file: !18, type: !4)
!29 = !DIExpression()
!30 = !DILocation(line: 21, scope: !17)
!31 = !DILocalVariable(name: "r", line: 22, scope: !17, file: !18, type: !10)
!32 = !DILocation(line: 22, scope: !17)
!33 = !DILocation(line: 23, scope: !17)
!34 = !DILocation(line: 24, scope: !17)
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