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llvm-mirror/test/Transforms/Inline/alloca-dbgdeclare.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

132 lines
6.3 KiB
LLVM
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; RUN: opt -inline -S < %s | FileCheck %s
; RUN: opt -passes='cgscc(inline)' -S < %s | FileCheck %s
; struct A {
; int arg0;
; double arg1[2];
; } a, b;
;
; void fn3(A p1) {
; if (p1.arg0)
; a = p1;
; }
;
; void fn4() { fn3(b); }
;
; void fn5() {
; while (1)
; fn4();
; }
; ModuleID = 'test.cpp'
source_filename = "test/Transforms/Inline/alloca-dbgdeclare.ll"
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-apple-darwin"
%struct.A = type { i32, [2 x double] }
@a = global %struct.A zeroinitializer, align 8, !dbg !0
@b = global %struct.A zeroinitializer, align 8, !dbg !12
; Function Attrs: nounwind
declare void @_Z3fn31A(%struct.A* nocapture readonly) #0
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #2
; Function Attrs: nounwind
define void @_Z3fn4v() #0 !dbg !22 {
entry:
; Test that the dbg.declare is moved together with the alloca.
; CHECK: define void @_Z3fn5v()
; CHECK-NEXT: entry:
; CHECK-NEXT: %agg.tmp.sroa.3.i = alloca [20 x i8], align 4
; CHECK-NEXT: call void @llvm.dbg.declare(metadata [20 x i8]* %agg.tmp.sroa.3.i,
%agg.tmp.sroa.3 = alloca [20 x i8], align 4
tail call void @llvm.dbg.declare(metadata [20 x i8]* %agg.tmp.sroa.3, metadata !25, metadata !30), !dbg !31
%agg.tmp.sroa.0.0.copyload = load i32, i32* getelementptr inbounds (%struct.A, %struct.A* @b, i64 0, i32 0), align 8, !dbg !33
tail call void @llvm.dbg.value(metadata i32 %agg.tmp.sroa.0.0.copyload, metadata !25, metadata !34), !dbg !31
%agg.tmp.sroa.3.0..sroa_idx = getelementptr inbounds [20 x i8], [20 x i8]* %agg.tmp.sroa.3, i64 0, i64 0, !dbg !33
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %agg.tmp.sroa.3.0..sroa_idx, i8* align 4 getelementptr (i8, i8* bitcast (%struct.A* @b to i8*), i64 4), i64 20, i1 false), !dbg !33
tail call void @llvm.dbg.declare(metadata %struct.A* undef, metadata !25, metadata !35) #0, !dbg !31
%tobool.i = icmp eq i32 %agg.tmp.sroa.0.0.copyload, 0, !dbg !36
br i1 %tobool.i, label %_Z3fn31A.exit, label %if.then.i, !dbg !38
if.then.i: ; preds = %entry
store i32 %agg.tmp.sroa.0.0.copyload, i32* getelementptr inbounds (%struct.A, %struct.A* @a, i64 0, i32 0), align 8, !dbg !39
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 getelementptr (i8, i8* bitcast (%struct.A* @a to i8*), i64 4), i8* align 4 %agg.tmp.sroa.3.0..sroa_idx, i64 20, i1 false), !dbg !39
br label %_Z3fn31A.exit, !dbg !39
_Z3fn31A.exit: ; preds = %if.then.i, %entry
ret void, !dbg !33
}
; Function Attrs: noreturn nounwind
define void @_Z3fn5v() #3 !dbg !40 {
entry:
br label %while.body, !dbg !41
while.body: ; preds = %while.body, %entry
call void @_Z3fn4v(), !dbg !42
br label %while.body, !dbg !41
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }
attributes #2 = { argmemonly nounwind }
attributes #3 = { noreturn nounwind }
!llvm.dbg.cu = !{!14}
!llvm.module.flags = !{!19, !20}
!llvm.ident = !{!21}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "a", scope: null, file: !2, line: 4, type: !3, isLocal: false, isDefinition: true)
!2 = !DIFile(filename: "test.cpp", directory: "")
!3 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !2, line: 1, size: 192, align: 64, elements: !4, identifier: "_ZTS1A")
!4 = !{!5, !7}
!5 = !DIDerivedType(tag: DW_TAG_member, name: "arg0", scope: !3, file: !2, line: 2, baseType: !6, size: 32, align: 32)
!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!7 = !DIDerivedType(tag: DW_TAG_member, name: "arg1", scope: !3, file: !2, line: 3, baseType: !8, size: 128, align: 64, offset: 64)
!8 = !DICompositeType(tag: DW_TAG_array_type, baseType: !9, size: 128, align: 64, elements: !10)
!9 = !DIBasicType(name: "double", size: 64, align: 64, encoding: DW_ATE_float)
!10 = !{!11}
!11 = !DISubrange(count: 2)
!12 = !DIGlobalVariableExpression(var: !13, expr: !DIExpression())
!13 = !DIGlobalVariable(name: "b", scope: null, file: !2, line: 4, type: !3, isLocal: false, isDefinition: true)
!14 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !15, producer: "clang version 3.7.0 (trunk 227480) (llvm/trunk 227517)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !16, retainedTypes: !17, globals: !18, imports: !16)
!15 = !DIFile(filename: "<stdin>", directory: "")
!16 = !{}
!17 = !{!3}
!18 = !{!0, !12}
!19 = !{i32 2, !"Dwarf Version", i32 4}
!20 = !{i32 2, !"Debug Info Version", i32 3}
!21 = !{!"clang version 3.7.0 (trunk 227480) (llvm/trunk 227517)"}
!22 = distinct !DISubprogram(name: "fn4", linkageName: "_Z3fn4v", scope: !2, file: !2, line: 11, type: !23, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !14, retainedNodes: !16)
!23 = !DISubroutineType(types: !24)
!24 = !{null}
!25 = !DILocalVariable(name: "p1", arg: 1, scope: !26, file: !2, line: 6, type: !3)
!26 = distinct !DISubprogram(name: "fn3", linkageName: "_Z3fn31A", scope: !2, file: !2, line: 6, type: !27, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !14, retainedNodes: !29)
!27 = !DISubroutineType(types: !28)
!28 = !{null, !3}
!29 = !{!25}
!30 = !DIExpression(DW_OP_LLVM_fragment, 32, 160)
!31 = !DILocation(line: 6, scope: !26, inlinedAt: !32)
!32 = distinct !DILocation(line: 11, scope: !22)
!33 = !DILocation(line: 11, scope: !22)
!34 = !DIExpression(DW_OP_LLVM_fragment, 0, 32)
!35 = !DIExpression(DW_OP_deref)
!36 = !DILocation(line: 7, scope: !37, inlinedAt: !32)
!37 = distinct !DILexicalBlock(scope: !26, file: !2, line: 7)
!38 = !DILocation(line: 7, scope: !26, inlinedAt: !32)
!39 = !DILocation(line: 8, scope: !37, inlinedAt: !32)
!40 = distinct !DISubprogram(name: "fn5", linkageName: "_Z3fn5v", scope: !2, file: !2, line: 13, type: !23, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: true, unit: !14, retainedNodes: !16)
!41 = !DILocation(line: 14, scope: !40)
!42 = !DILocation(line: 15, scope: !40)
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