Bitcode: Set LastDL after writing DebugLocs

Somehow I dropped this in r233585, and we haven't had `DEBUG_LOC_AGAIN`
records since.  Add it back.  Also tests that the output assembly looks
okay.

Fixes PR23436.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236661 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 85a6da33a6ef242cf6573076f9f06db7b7b77156..199663d1bfd881843ce6a749c79cd848bcc88c04 100644 (file)
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -2135,6 +2135,8 @@ static void WriteFunction(const Function &F, ValueEnumerator &VE,
       Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt()));
       Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
       Vals.clear();
+
+      LastDL = DL;
     }
 
   // Emit names for all the instructions etc.

diff --git a/test/Bitcode/debug-loc-again.ll b/test/Bitcode/debug-loc-again.ll
new file mode 100644 (file)
index 0000000..6dbea16
--- /dev/null
+++ b/test/Bitcode/debug-loc-again.ll
@@ -0,0 +1,36 @@
+; RUN: llvm-as < %s | llvm-bcanalyzer -dump | FileCheck %s -check-prefix=BC
+; PR23436: Actually emit DEBUG_LOC_AGAIN records.
+
+; BC: <DEBUG_LOC op
+; BC: <DEBUG_LOC_AGAIN/>
+; BC: <DEBUG_LOC op
+; BC: <DEBUG_LOC_AGAIN/>
+
+; RUN: llvm-as < %s | llvm-dis | FileCheck %s
+; RUN: verify-uselistorder %s
+; Check that this round-trips correctly.
+
+define void @foo() {
+entry:
+  %a = add i32 0, 0, !dbg !3
+  %b = add i32 0, 1, !dbg !3
+  %c = add i32 0, 2, !dbg !4
+  ret void, !dbg !4
+}
+
+; CHECK-LABEL: entry:
+; CHECK-NEXT: %a = add i32 0, 0, !dbg ![[LINE1:[0-9]+]]
+; CHECK-NEXT: %b = add i32 0, 1, !dbg ![[LINE1]]
+; CHECK-NEXT: %c = add i32 0, 2, !dbg ![[LINE2:[0-9]+]]
+; CHECK-NEXT: ret void, !dbg ![[LINE2]]
+; CHECK: ![[LINE1]] = !DILocation(line: 1,
+; CHECK: ![[LINE2]] = !DILocation(line: 2,
+
+!llvm.module.flags = !{!0}
+
+!0 = !{i32 2, !"Debug Info Version", i32 3}
+!1 = !DICompileUnit(language: DW_LANG_C99, file: !DIFile(filename: "f", directory: "/d"),
+                    subprograms: !{!2})
+!2 = !DISubprogram(name: "foo")
+!3 = !DILocation(line: 1, scope: !2)
+!4 = !DILocation(line: 2, scope: !2)