mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-04 09:54:09 +00:00
af6ca7789c
The function stack poisioner conditionally stores local variables either in an alloca or in malloc'ated memory, which has the unfortunate side-effect, that the actual address of the variable is only materialized when the variable is accessed, which means that those variables are mostly invisible to the debugger even when compiling without optimizations. This patch stores the address of the local stack base into an alloca, which can be referred to by the debug info and is available throughout the function. This adds one extra pointer-sized alloca to each stack frame (but mem2reg can optimize it away again when optimizations are enabled, yielding roughly the same debug info quality as before in optimized code). rdar://problem/30433661 Differential Revision: https://reviews.llvm.org/D41034 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320415 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
5.0 KiB
LLVM
87 lines
5.0 KiB
LLVM
; RUN: opt -S -asan %s | FileCheck %s
|
|
|
|
; The IR of this testcase is generated from the following C code:
|
|
; void bar (int);
|
|
;
|
|
; void foo() {
|
|
; __block int x;
|
|
; bar(x);
|
|
; }
|
|
; by compiling it with 'clang -emit-llvm -g -S' and then by manually
|
|
; adding the sanitize_address attribute to the @foo() function (so
|
|
; that ASAN accepts to instrument the function in the above opt run).
|
|
|
|
; Check that the location of the ASAN instrumented __block variable is
|
|
; correct.
|
|
; CHECK: !DIExpression(DW_OP_deref, DW_OP_plus_uconst, 32, DW_OP_plus_uconst, 8, DW_OP_deref, DW_OP_plus_uconst, 24)
|
|
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
|
|
%struct.__block_byref_x = type { i8*, %struct.__block_byref_x*, i32, i32, i32 }
|
|
|
|
; Function Attrs: nounwind ssp uwtable
|
|
define void @foo() #0 !dbg !4 {
|
|
entry:
|
|
%x = alloca %struct.__block_byref_x, align 8
|
|
call void @llvm.dbg.declare(metadata %struct.__block_byref_x* %x, metadata !12, metadata !22), !dbg !23
|
|
%byref.isa = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 0, !dbg !24
|
|
store i8* null, i8** %byref.isa, !dbg !24
|
|
%byref.forwarding = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 1, !dbg !24
|
|
store %struct.__block_byref_x* %x, %struct.__block_byref_x** %byref.forwarding, !dbg !24
|
|
%byref.flags = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 2, !dbg !24
|
|
store i32 0, i32* %byref.flags, !dbg !24
|
|
%byref.size = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 3, !dbg !24
|
|
store i32 32, i32* %byref.size, !dbg !24
|
|
%forwarding = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 1, !dbg !25
|
|
%0 = load %struct.__block_byref_x*, %struct.__block_byref_x** %forwarding, !dbg !25
|
|
%x1 = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %0, i32 0, i32 4, !dbg !25
|
|
%1 = load i32, i32* %x1, align 4, !dbg !25
|
|
call void @bar(i32 %1), !dbg !25
|
|
%2 = bitcast %struct.__block_byref_x* %x to i8*, !dbg !26
|
|
call void @_Block_object_dispose(i8* %2, i32 8) #3, !dbg !26
|
|
ret void, !dbg !26
|
|
}
|
|
|
|
; Function Attrs: nounwind readnone
|
|
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
|
|
|
|
declare void @bar(i32) #2
|
|
|
|
declare void @_Block_object_dispose(i8*, i32)
|
|
|
|
attributes #0 = { nounwind ssp uwtable sanitize_address "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 = { nounwind readnone }
|
|
attributes #2 = { "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 #3 = { nounwind }
|
|
|
|
!llvm.dbg.cu = !{!0}
|
|
!llvm.module.flags = !{!8, !9, !10}
|
|
!llvm.ident = !{!11}
|
|
|
|
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 (trunk 223120) (llvm/trunk 223119)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
|
|
!1 = !DIFile(filename: "block.c", directory: "/tmp")
|
|
!2 = !{}
|
|
!4 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
|
|
!5 = !DIFile(filename: "block.c", directory: "/tmp")
|
|
!6 = !DISubroutineType(types: !7)
|
|
!7 = !{null}
|
|
!8 = !{i32 2, !"Dwarf Version", i32 2}
|
|
!9 = !{i32 2, !"Debug Info Version", i32 3}
|
|
!10 = !{i32 1, !"PIC Level", i32 2}
|
|
!11 = !{!"clang version 3.6.0 (trunk 223120) (llvm/trunk 223119)"}
|
|
!12 = !DILocalVariable(name: "x", line: 4, scope: !4, file: !5, type: !13)
|
|
!13 = !DICompositeType(tag: DW_TAG_structure_type, size: 224, flags: DIFlagBlockByrefStruct, file: !1, scope: !5, elements: !14)
|
|
!14 = !{!15, !17, !18, !20, !21}
|
|
!15 = !DIDerivedType(tag: DW_TAG_member, name: "__isa", size: 64, align: 64, file: !1, scope: !5, baseType: !16)
|
|
!16 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null)
|
|
!17 = !DIDerivedType(tag: DW_TAG_member, name: "__forwarding", size: 64, align: 64, offset: 64, file: !1, scope: !5, baseType: !16)
|
|
!18 = !DIDerivedType(tag: DW_TAG_member, name: "__flags", size: 32, align: 32, offset: 128, file: !1, scope: !5, baseType: !19)
|
|
!19 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
|
|
!20 = !DIDerivedType(tag: DW_TAG_member, name: "__size", size: 32, align: 32, offset: 160, file: !1, scope: !5, baseType: !19)
|
|
!21 = !DIDerivedType(tag: DW_TAG_member, name: "x", size: 32, align: 32, offset: 192, file: !1, scope: !5, baseType: !19)
|
|
!22 = !DIExpression(DW_OP_plus_uconst, 8, DW_OP_deref, DW_OP_plus_uconst, 24)
|
|
!23 = !DILocation(line: 4, column: 15, scope: !4)
|
|
!24 = !DILocation(line: 4, column: 3, scope: !4)
|
|
!25 = !DILocation(line: 5, column: 3, scope: !4)
|
|
!26 = !DILocation(line: 6, column: 1, scope: !4)
|