[safestack] Fixup llvm.dbg.value when rewriting unsafe allocas.
When moving unsafe allocas to the unsafe stack, dbg.declare intrinsics are
updated to refer to the new location.
This change does the same to dbg.value intrinsics.
llvm-svn: 272968
diff --git a/llvm/test/Transforms/SafeStack/debug-loc-dynamic.ll b/llvm/test/Transforms/SafeStack/debug-loc-dynamic.ll
new file mode 100644
index 0000000..280d010
--- /dev/null
+++ b/llvm/test/Transforms/SafeStack/debug-loc-dynamic.ll
@@ -0,0 +1,57 @@
+; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
+
+; Test llvm.dbg.value for dynamic allocas moved onto the unsafe stack.
+; In the dynamic alloca case, the dbg.value does not change with the exception
+; of the alloca pointer in the first argument being replaced with the new stack
+; top address.
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @f(i32 %n) safestack !dbg !6 {
+entry:
+ tail call void @llvm.dbg.value(metadata i32 %n, i64 0, metadata !11, metadata !14), !dbg !15
+ %0 = zext i32 %n to i64, !dbg !16
+
+; CHECK: store i8* %[[VLA:.*]], i8** @__safestack_unsafe_stack_ptr
+; CHECK: tail call void @llvm.dbg.value(metadata i8* %[[VLA]], i64 0, metadata ![[TYPE:.*]], metadata ![[EXPR:.*]])
+; CHECK: call void @capture({{.*}} %[[VLA]])
+
+ %vla = alloca i8, i64 %0, align 16, !dbg !16
+ tail call void @llvm.dbg.value(metadata i8* %vla, i64 0, metadata !12, metadata !17), !dbg !18
+ call void @capture(i8* nonnull %vla), !dbg !19
+ ret void, !dbg !20
+}
+
+declare void @capture(i8*)
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+!llvm.ident = !{!5}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 272832) (llvm/trunk 272831)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
+!1 = !DIFile(filename: "../llvm/1.cc", directory: "/code/build-llvm")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{!"clang version 3.9.0 (trunk 272832) (llvm/trunk 272831)"}
+!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fi", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !10)
+!7 = !DISubroutineType(types: !8)
+!8 = !{null, !9}
+!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!10 = !{!11, !12}
+!11 = !DILocalVariable(name: "n", arg: 1, scope: !6, file: !1, line: 2, type: !9)
+
+; CHECK-DAG: ![[TYPE]] = !DILocalVariable(name: "x",
+!12 = !DILocalVariable(name: "x", scope: !6, file: !1, line: 3, type: !13)
+!13 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
+!14 = !DIExpression()
+!15 = !DILocation(line: 2, column: 12, scope: !6)
+!16 = !DILocation(line: 3, column: 3, scope: !6)
+
+; CHECK-DAG: ![[EXPR]] = !DIExpression(DW_OP_deref)
+!17 = !DIExpression(DW_OP_deref)
+!18 = !DILocation(line: 3, column: 8, scope: !6)
+!19 = !DILocation(line: 4, column: 3, scope: !6)
+!20 = !DILocation(line: 5, column: 1, scope: !6)