mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-01 05:01:59 +01:00
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
61 lines
3.1 KiB
LLVM
61 lines
3.1 KiB
LLVM
; RUN: opt < %s -asan -asan-module -asan-use-after-return=0 -S | FileCheck %s
|
|
|
|
; Checks that llvm.dbg.declare instructions are updated
|
|
; accordingly as we merge allocas.
|
|
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
define i32 @_Z3zzzi(i32 %p) nounwind uwtable sanitize_address !dbg !5 {
|
|
entry:
|
|
%p.addr = alloca i32, align 4
|
|
%r = alloca i32, align 4
|
|
store volatile i32 %p, i32* %p.addr, align 4
|
|
call void @llvm.dbg.declare(metadata i32* %p.addr, metadata !10, metadata !DIExpression()), !dbg !11
|
|
call void @llvm.dbg.declare(metadata i32* %r, metadata !12, metadata !DIExpression()), !dbg !14
|
|
%0 = load i32, i32* %p.addr, align 4, !dbg !14
|
|
%add = add nsw i32 %0, 1, !dbg !14
|
|
store volatile i32 %add, i32* %r, align 4, !dbg !14
|
|
%1 = load i32, i32* %r, align 4, !dbg !15
|
|
ret i32 %1, !dbg !15
|
|
}
|
|
|
|
; CHECK: define i32 @_Z3zzzi
|
|
; CHECK: entry:
|
|
; Verify that llvm.dbg.declare calls are in the entry basic block.
|
|
; CHECK-NOT: %entry
|
|
; CHECK: call void @llvm.dbg.declare(metadata {{.*}}, metadata ![[ARG_ID:[0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 32))
|
|
; CHECK-NOT: %entry
|
|
; CHECK: call void @llvm.dbg.declare(metadata {{.*}}, metadata ![[VAR_ID:[0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 48))
|
|
|
|
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
|
|
|
|
!llvm.dbg.cu = !{!0}
|
|
!llvm.module.flags = !{!17}
|
|
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 169314)", isOptimized: true, emissionKind: FullDebug, file: !16, enums: !1, retainedTypes: !1, globals: !1)
|
|
!1 = !{}
|
|
!5 = distinct !DISubprogram(name: "zzz", linkageName: "_Z3zzzi", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !16, scope: !6, type: !7, retainedNodes: !1)
|
|
!6 = !DIFile(filename: "a.cc", directory: "/usr/local/google/llvm_cmake_clang/tmp/debuginfo")
|
|
!7 = !DISubroutineType(types: !8)
|
|
!8 = !{!9, !9}
|
|
!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
|
|
!10 = !DILocalVariable(name: "p", line: 1, arg: 1, scope: !5, file: !6, type: !9)
|
|
!11 = !DILocation(line: 1, scope: !5)
|
|
!12 = !DILocalVariable(name: "r", line: 2, scope: !13, file: !6, type: !9)
|
|
|
|
; Verify that debug descriptors for argument and local variable will be replaced
|
|
; with descriptors that end with OpDeref (encoded as 2).
|
|
; CHECK: ![[ARG_ID]] = !DILocalVariable(name: "p", arg: 1,{{.*}} line: 1
|
|
; CHECK: ![[VAR_ID]] = !DILocalVariable(name: "r",{{.*}} line: 2
|
|
; Verify that there are no more variable descriptors.
|
|
; CHECK-NOT: !DILocalVariable(tag: DW_TAG_arg_variable
|
|
; CHECK-NOT: !DILocalVariable(tag: DW_TAG_auto_variable
|
|
|
|
|
|
!13 = distinct !DILexicalBlock(line: 1, column: 0, file: !16, scope: !5)
|
|
!14 = !DILocation(line: 2, scope: !13)
|
|
!15 = !DILocation(line: 3, scope: !13)
|
|
!16 = !DIFile(filename: "a.cc", directory: "/usr/local/google/llvm_cmake_clang/tmp/debuginfo")
|
|
!17 = !{i32 1, !"Debug Info Version", i32 3}
|