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block-asan.ll
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; 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, 8, DW_OP_deref, DW_OP_plus, 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 {
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 = !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 (trunk 223120) (llvm/trunk 223119)", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "block.c", directory: "/tmp")
!2 = !{}
!3 = !{!4}
!4 = !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, isOptimized: false, scopeLine: 3, file: !1, scope: !5, type: !6, function: void ()* @foo, 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(tag: DW_TAG_auto_variable, 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, 8, DW_OP_deref, DW_OP_plus, 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)