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llvm-mirror/test/DebugInfo/Generic/cross-cu-inlining.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
6.2 KiB
LLVM
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; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj -dwarf-linkage-names=All < %s | llvm-dwarfdump -v -debug-info - | FileCheck -implicit-check-not=DW_TAG %s
; RUN: %llc_dwarf -accel-tables=Apple -dwarf-linkage-names=All -O0 -filetype=obj < %s | llvm-dwarfdump -v - | FileCheck --check-prefix=CHECK-ACCEL --check-prefix=CHECK %s
; Build from source:
; $ clang++ a.cpp b.cpp -g -c -emit-llvm
; $ llvm-link a.bc b.bc -o ab.bc
; $ opt -inline ab.bc -o ab-opt.bc
; $ cat a.cpp
; extern int i;
; int func(int);
; int main() {
; return func(i);
; }
; $ cat b.cpp
; int __attribute__((always_inline)) func(int x) {
; return x * 2;
; }
; Ensure that func inlined into main is described and references the abstract
; definition in b.cpp's CU.
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_name {{.*}} "a.cpp"
; CHECK: DW_TAG_subprogram
; CHECK: DW_AT_type [DW_FORM_ref_addr] (0x00000000[[INT:[a-f0-9]+]]
; CHECK: 0x[[INLINED:[0-9a-f]*]]:{{.*}}DW_TAG_inlined_subroutine
; CHECK: DW_AT_abstract_origin {{.*}}[[ABS_FUNC:........]] "_Z4funci"
; CHECK: DW_TAG_formal_parameter
; CHECK: DW_AT_abstract_origin {{.*}}[[ABS_VAR:........]] "x"
; Check the abstract definition is in the 'b.cpp' CU and doesn't contain any
; concrete information (address range or variable location)
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_name {{.*}} "b.cpp"
; CHECK: 0x[[ABS_FUNC]]: DW_TAG_subprogram
; CHECK-NOT: DW_AT_low_pc
; CHECK: 0x[[ABS_VAR]]: DW_TAG_formal_parameter
; CHECK-NOT: DW_AT_location
; CHECK: DW_AT_type [DW_FORM_ref4] {{.*}} {0x[[INT]]}
; CHECK-NOT: DW_AT_location
; CHECK: 0x[[INT]]: DW_TAG_base_type
; CHECK: DW_AT_name {{.*}} "int"
; Check the concrete out of line definition references the abstract and
; provides the address range and variable location
; CHECK: 0x[[FUNC:[0-9a-f]*]]{{.*}}DW_TAG_subprogram
; CHECK: DW_AT_low_pc
; CHECK: DW_AT_abstract_origin {{.*}} {0x[[ABS_FUNC]]} "_Z4funci"
; CHECK: DW_TAG_formal_parameter
; CHECK: DW_AT_location
; CHECK: DW_AT_abstract_origin {{.*}} {0x[[ABS_VAR]]} "x"
; Check that both the inline and the non out of line version of func are
; correctly referenced in the accelerator table. Before r221837, the one
; in the second compilation unit had a wrong offset
; CHECK-ACCEL: .apple_names contents:
; CHECK-ACCEL: String{{.*}}"func"
; CHECK-ACCEL-NOT: String
; CHECK-ACCEL: Atom[0]{{.*}}[[INLINED]]
; CHECK-ACCEL-NOT: String
; CHECK-ACCEL: Atom[0]{{.*}}[[FUNC]]
@i = external global i32
; Function Attrs: uwtable
define i32 @main() #0 !dbg !4 {
entry:
%x.addr.i = alloca i32, align 4
%retval = alloca i32, align 4
store i32 0, i32* %retval
%0 = load i32, i32* @i, align 4, !dbg !19
%1 = bitcast i32* %x.addr.i to i8*
call void @llvm.lifetime.start(i64 4, i8* %1)
store i32 %0, i32* %x.addr.i, align 4
call void @llvm.dbg.declare(metadata i32* %x.addr.i, metadata !120, metadata !DIExpression()), !dbg !21
%2 = load i32, i32* %x.addr.i, align 4, !dbg !22
%mul.i = mul nsw i32 %2, 2, !dbg !22
%3 = bitcast i32* %x.addr.i to i8*, !dbg !22
call void @llvm.lifetime.end(i64 4, i8* %3), !dbg !22
ret i32 %mul.i, !dbg !19
}
; Function Attrs: alwaysinline nounwind uwtable
define i32 @_Z4funci(i32 %x) #1 !dbg !12 {
entry:
%x.addr = alloca i32, align 4
store i32 %x, i32* %x.addr, align 4
call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !20, metadata !DIExpression()), !dbg !23
%0 = load i32, i32* %x.addr, align 4, !dbg !24
%mul = mul nsw i32 %0, 2, !dbg !24
ret i32 %mul, !dbg !24
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
; Function Attrs: nounwind
declare void @llvm.lifetime.start(i64, i8* nocapture) #3
; Function Attrs: nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) #3
attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { alwaysinline nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0, !9}
!llvm.module.flags = !{!16, !17}
!llvm.ident = !{!18, !18}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!1 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo")
!2 = !{}
!4 = distinct !DISubprogram(name: "main", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, retainedNodes: !2)
!5 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo")
!6 = !DISubroutineType(types: !7)
!7 = !{!8}
!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !10, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!10 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo")
!12 = distinct !DISubprogram(name: "func", linkageName: "_Z4funci", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !9, scopeLine: 1, file: !10, scope: !13, type: !14, retainedNodes: !2)
!13 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo")
!14 = !DISubroutineType(types: !15)
!15 = !{!8, !8}
!16 = !{i32 2, !"Dwarf Version", i32 4}
!17 = !{i32 2, !"Debug Info Version", i32 3}
!18 = !{!"clang version 3.5.0 "}
!19 = !DILocation(line: 4, scope: !4)
!20 = !DILocalVariable(name: "x", line: 1, arg: 1, scope: !12, file: !13, type: !8)
!120 = !DILocalVariable(name: "x", line: 1, arg: 1, scope: !12, file: !13, type: !8)
!21 = !DILocation(line: 1, scope: !12, inlinedAt: !19)
!22 = !DILocation(line: 2, scope: !12, inlinedAt: !19)
!23 = !DILocation(line: 1, scope: !12)
!24 = !DILocation(line: 2, scope: !12)
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