From: David Blaikie <dblaikie@gmail.com>
Date: Sat, 12 Apr 2014 05:35:59 +0000 (+0000)
Subject: PR13337: Omit DW_TAG_restrict_type when compiling for DWARF2
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=937c689cdcfa75960b294352e960250cb781fb04;p=oota-llvm.git

PR13337: Omit DW_TAG_restrict_type when compiling for DWARF2

DWARF3 introduced DW_TAG_restrict_type, so avoid using it in prior
versions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206105 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index c1f0538e4cf..7f6fd5d13c3 100644
--- a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -985,6 +985,10 @@ DIE *DwarfUnit::getOrCreateTypeDIE(const MDNode *TyNode) {
   assert(Ty == resolve(Ty.getRef()) &&
          "type was not uniqued, possible ODR violation.");
 
+  // DW_TAG_restrict_type is not supported in DWARF2
+  if (Ty.getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
+    return getOrCreateTypeDIE(resolve(DIDerivedType(Ty).getTypeDerivedFrom()));
+
   // Construct the context before querying for the existence of the DIE in case
   // such construction creates the DIE.
   DIScope Context = resolve(Ty.getContext());
diff --git a/test/DebugInfo/restrict.ll b/test/DebugInfo/restrict.ll
new file mode 100644
index 00000000000..ceb844f16ef
--- /dev/null
+++ b/test/DebugInfo/restrict.ll
@@ -0,0 +1,53 @@
+; REQUIRES: object-emission
+
+; RUN: %llc_dwarf -dwarf-version=2 -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck --check-prefix=CHECK --check-prefix=V2 %s
+; RUN: %llc_dwarf -dwarf-version=3 -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck --check-prefix=CHECK --check-prefix=V3 %s
+
+; CHECK: DW_AT_name {{.*}} "dst"
+; V2: DW_AT_type {{.*}} {[[PTR:0x.*]]}
+; V3: DW_AT_type {{.*}} {[[RESTRICT:0x.*]]}
+; V3: [[RESTRICT]]: {{.*}}DW_TAG_restrict_type
+; V3-NEXT: DW_AT_type {{.*}} {[[PTR:0x.*]]}
+; CHECK: [[PTR]]: {{.*}}DW_TAG_pointer_type
+; CHECK-NOT: DW_AT_type
+
+; Generated with clang from:
+; void foo(void* __restrict__ dst) {
+; }
+
+
+; Function Attrs: nounwind uwtable
+define void @_Z3fooPv(i8* noalias %dst) #0 {
+entry:
+  %dst.addr = alloca i8*, align 8
+  store i8* %dst, i8** %dst.addr, align 8
+  call void @llvm.dbg.declare(metadata !{i8** %dst.addr}, metadata !13), !dbg !14
+  ret void, !dbg !15
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata) #1
+
+attributes #0 = { nounwind uwtable "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 }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!10, !11}
+!llvm.ident = !{!12}
+
+!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/restrict.c] [DW_LANG_C_plus_plus]
+!1 = metadata !{metadata !"restrict.c", metadata !"/tmp/dbginfo"}
+!2 = metadata !{}
+!3 = metadata !{metadata !4}
+!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"foo", metadata !"foo", metadata !"_Z3fooPv", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i8*)* @_Z3fooPv, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [foo]
+!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/tmp/dbginfo/restrict.c]
+!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = metadata !{null, metadata !8}
+!8 = metadata !{i32 786487, null, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, metadata !9} ; [ DW_TAG_restrict_type ] [line 0, size 0, align 0, offset 0] [from ]
+!9 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, null} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
+!10 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
+!11 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
+!12 = metadata !{metadata !"clang version 3.5.0 "}
+!13 = metadata !{i32 786689, metadata !4, metadata !"dst", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [dst] [line 1]
+!14 = metadata !{i32 1, i32 0, metadata !4, null}
+!15 = metadata !{i32 2, i32 0, metadata !4, null}