1 ; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s 2 3 ; Test llvm.dbg.value for the local variables moved onto the unsafe stack. 4 ; SafeStack rewrites them relative to the unsafe stack pointer (base address of 5 ; the unsafe stack frame). 6 7 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 8 target triple = "x86_64-unknown-linux-gnu" 9 10 ; Function Attrs: noinline safestack uwtable 11 define void @f() #0 !dbg !6 { 12 entry: 13 ; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr 14 %x1 = alloca i32, align 4 15 %x2 = alloca i32, align 4 16 %0 = bitcast i32* %x1 to i8*, !dbg !13 17 %1 = bitcast i32* %x2 to i8*, !dbg !14 18 19 ; Unhandled dbg.value: expression does not start with OP_DW_deref 20 ; CHECK: call void @llvm.dbg.value(metadata ![[EMPTY:.*]], i64 0, metadata !{{.*}}, metadata !{{.*}}) 21 tail call void @llvm.dbg.value(metadata i32* %x1, i64 0, metadata !10, metadata !23), !dbg !16 22 23 ; Unhandled dbg.value: expression does not start with OP_DW_deref 24 ; CHECK: call void @llvm.dbg.value(metadata ![[EMPTY]], i64 0, metadata !{{.*}}, metadata !{{.*}}) 25 tail call void @llvm.dbg.value(metadata i32* %x1, i64 0, metadata !10, metadata !24), !dbg !16 26 27 ; Supported dbg.value: rewritted based on the [[USP]] value. 28 ; CHECK: call void @llvm.dbg.value(metadata i8* %[[USP]], i64 0, metadata ![[X1:.*]], metadata ![[X1_EXPR:.*]]) 29 tail call void @llvm.dbg.value(metadata i32* %x1, i64 0, metadata !10, metadata !15), !dbg !16 30 call void @capture(i32* nonnull %x1), !dbg !17 31 32 ; An extra non-dbg.value metadata use of %x2. Replaced with an empty metadata. 33 ; CHECK: call void @llvm.random.metadata.use(metadata ![[EMPTY]]) 34 call void @llvm.random.metadata.use(metadata i32* %x2) 35 36 ; CHECK: call void @llvm.dbg.value(metadata i8* %[[USP]], i64 0, metadata ![[X2:.*]], metadata ![[X2_EXPR:.*]]) 37 call void @llvm.dbg.value(metadata i32* %x2, i64 0, metadata !12, metadata !15), !dbg !18 38 call void @capture(i32* nonnull %x2), !dbg !19 39 ret void, !dbg !20 40 } 41 42 ; Function Attrs: argmemonly nounwind 43 declare void @llvm.lifetime.start(i64, i8* nocapture) #1 44 45 declare void @capture(i32*) #2 46 47 ; Function Attrs: argmemonly nounwind 48 declare void @llvm.lifetime.end(i64, i8* nocapture) #1 49 50 ; Function Attrs: nounwind readnone 51 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #3 52 53 declare void @llvm.random.metadata.use(metadata) 54 55 attributes #0 = { noinline safestack uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 56 attributes #1 = { argmemonly nounwind } 57 attributes #2 = { "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,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" } 58 attributes #3 = { nounwind readnone } 59 attributes #4 = { nounwind } 60 61 !llvm.dbg.cu = !{!0} 62 !llvm.module.flags = !{!3, !4} 63 !llvm.ident = !{!5} 64 65 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 271022) (llvm/trunk 271027)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 66 !1 = !DIFile(filename: "../llvm/2.cc", directory: "/code/build-llvm") 67 68 ; CHECK-DAG: ![[EMPTY]] = !{} 69 !2 = !{} 70 !3 = !{i32 2, !"Dwarf Version", i32 4} 71 !4 = !{i32 2, !"Debug Info Version", i32 3} 72 !5 = !{!"clang version 3.9.0 (trunk 271022) (llvm/trunk 271027)"} 73 !6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 4, type: !7, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !9) 74 !7 = !DISubroutineType(types: !8) 75 !8 = !{null} 76 !9 = !{!10, !12} 77 78 ; CHECK-DAG: ![[X1]] = !DILocalVariable(name: "x1", 79 !10 = !DILocalVariable(name: "x1", scope: !6, file: !1, line: 5, type: !11) 80 !11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 81 82 ; CHECK-DAG: ![[X2]] = !DILocalVariable(name: "x2", 83 !12 = !DILocalVariable(name: "x2", scope: !6, file: !1, line: 6, type: !11) 84 !13 = !DILocation(line: 5, column: 3, scope: !6) 85 !14 = !DILocation(line: 6, column: 3, scope: !6) 86 87 ; CHECK-DAG: ![[X1_EXPR]] = !DIExpression(DW_OP_deref, DW_OP_minus, 4) 88 ; CHECK-DAG: ![[X2_EXPR]] = !DIExpression(DW_OP_deref, DW_OP_minus, 8) 89 !15 = !DIExpression(DW_OP_deref) 90 !16 = !DILocation(line: 5, column: 7, scope: !6) 91 !17 = !DILocation(line: 8, column: 3, scope: !6) 92 !18 = !DILocation(line: 6, column: 7, scope: !6) 93 !19 = !DILocation(line: 9, column: 3, scope: !6) 94 !20 = !DILocation(line: 10, column: 1, scope: !6) 95 !21 = !DILocation(line: 10, column: 1, scope: !22) 96 !22 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 1) 97 !23 = !DIExpression() 98 !24 = !DIExpression(DW_OP_minus, 42) 99
