mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-19 11:02:59 +02:00
a2029fa58e
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
90 lines
4.6 KiB
LLVM
90 lines
4.6 KiB
LLVM
; Test dwarf codegen for DILocalVariable of a byval function argument that
|
|
; points to neither an argument nor an alloca. This kind of IR is generated by
|
|
; SafeStack for unsafe byval arguments.
|
|
; RUN: llc -mtriple=x86_64-unknown-unknown -stop-after expand-isel-pseudos %s -o - | FileCheck %s
|
|
|
|
; This was built by compiling the following source with SafeStack and
|
|
; simplifying the result a little.
|
|
; struct S {
|
|
; int a[100];
|
|
; };
|
|
;
|
|
; int f(S zzz, unsigned long len) {
|
|
; return zzz.a[len];
|
|
; }
|
|
|
|
; CHECK: ![[ZZZ:.*]] = !DILocalVariable(name: "zzz",
|
|
; CHECK: DBG_VALUE {{.*}} ![[ZZZ]], !DIExpression(DW_OP_deref, DW_OP_constu, 400, DW_OP_minus)
|
|
|
|
%struct.S = type { [100 x i32] }
|
|
|
|
@__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8*
|
|
|
|
; Function Attrs: norecurse nounwind readonly safestack uwtable
|
|
define i32 @_Z1f1Sm(%struct.S* byval nocapture readonly align 8 %zzz, i64 %len) #0 !dbg !12 {
|
|
entry:
|
|
%unsafe_stack_ptr = load i8*, i8** @__safestack_unsafe_stack_ptr, !dbg !22
|
|
%unsafe_stack_static_top = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400, !dbg !22
|
|
store i8* %unsafe_stack_static_top, i8** @__safestack_unsafe_stack_ptr, !dbg !22
|
|
; !17 describes "zzz"
|
|
call void @llvm.dbg.declare(metadata i8* %unsafe_stack_ptr, metadata !17, metadata !23), !dbg !22
|
|
%0 = getelementptr i8, i8* %unsafe_stack_ptr, i32 -400, !dbg !22
|
|
%zzz.unsafe-byval = bitcast i8* %0 to %struct.S*, !dbg !22
|
|
%1 = bitcast %struct.S* %zzz to i8*, !dbg !24
|
|
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %0, i8* align 8 %1, i64 400, i1 false), !dbg !24
|
|
tail call void @llvm.dbg.value(metadata i64 %len, metadata !18, metadata !25), !dbg !24
|
|
%arrayidx = getelementptr inbounds %struct.S, %struct.S* %zzz.unsafe-byval, i64 0, i32 0, i64 %len, !dbg !26
|
|
%2 = load i32, i32* %arrayidx, align 4, !dbg !26, !tbaa !27
|
|
store i8* %unsafe_stack_ptr, i8** @__safestack_unsafe_stack_ptr, !dbg !31
|
|
ret i32 %2, !dbg !31
|
|
}
|
|
|
|
; Function Attrs: nounwind readnone
|
|
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
|
|
|
|
; Function Attrs: nounwind readnone
|
|
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
|
|
|
|
; Function Attrs: argmemonly nounwind
|
|
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1) #2
|
|
|
|
attributes #0 = { norecurse nounwind readonly safestack uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
|
attributes #1 = { nounwind readnone }
|
|
attributes #2 = { argmemonly nounwind }
|
|
|
|
!llvm.dbg.cu = !{!0}
|
|
!llvm.module.flags = !{!19, !20}
|
|
!llvm.ident = !{!21}
|
|
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 254107) (llvm/trunk 254109)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
|
|
!1 = !DIFile(filename: "../llvm/1.cc", directory: "/tmp/build")
|
|
!2 = !{}
|
|
!3 = !{!4}
|
|
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 4, size: 3200, align: 32, elements: !5, identifier: "_ZTS1S")
|
|
!5 = !{!6}
|
|
!6 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !4, file: !1, line: 5, baseType: !7, size: 3200, align: 32)
|
|
!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 3200, align: 32, elements: !9)
|
|
!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
|
|
!9 = !{!10}
|
|
!10 = !DISubrange(count: 100)
|
|
!12 = distinct !DISubprogram(name: "f", linkageName: "_Z1f1Sm", scope: !1, file: !1, line: 8, type: !13, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !16)
|
|
!13 = !DISubroutineType(types: !14)
|
|
!14 = !{!8, !4, !15}
|
|
!15 = !DIBasicType(name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
|
|
!16 = !{!17, !18}
|
|
!17 = !DILocalVariable(name: "zzz", arg: 1, scope: !12, file: !1, line: 8, type: !4)
|
|
!18 = !DILocalVariable(name: "len", arg: 2, scope: !12, file: !1, line: 8, type: !15)
|
|
!19 = !{i32 2, !"Dwarf Version", i32 4}
|
|
!20 = !{i32 2, !"Debug Info Version", i32 3}
|
|
!21 = !{!"clang version 3.8.0 (trunk 254107) (llvm/trunk 254109)"}
|
|
!22 = !DILocation(line: 8, column: 9, scope: !12)
|
|
!23 = !DIExpression(DW_OP_deref, DW_OP_constu, 400, DW_OP_minus)
|
|
!24 = !DILocation(line: 8, column: 28, scope: !12)
|
|
!25 = !DIExpression()
|
|
!26 = !DILocation(line: 9, column: 10, scope: !12)
|
|
!27 = !{!28, !28, i64 0}
|
|
!28 = !{!"int", !29, i64 0}
|
|
!29 = !{!"omnipotent char", !30, i64 0}
|
|
!30 = !{!"Simple C/C++ TBAA"}
|
|
!31 = !DILocation(line: 9, column: 3, scope: !12)
|