Fix PR13202 and a regtest.

DwarfDebug class could generate the same (inlined) DIVariable twice:
1) when trying to find abstract debug variable for a concrete inlined instance.
2) when explicitly collecting info for variables that were optimized out.

This change makes sure that this duplication won't happen and makes
Clang pass "gdb.opt/inline-locals" test from gdb testsuite.

Reviewed by Eric Christopher.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159811 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 0e8f0ff6f274797bd5e0b447e282b0e2c378d556..038792b426a32c46747c9c652df07401e2efc0bb 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1422,6 +1422,12 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
         DIVariable DV(Variables.getElement(i));
         if (!DV || !DV.Verify() || !ProcessedVars.insert(DV))
           continue;
+        // Check that DbgVariable for DV wasn't created earlier, when
+        // findAbstractVariable() was called for inlined instance of DV.
+        LLVMContext &Ctx = DV->getContext();
+        DIVariable CleanDV = cleanseInlinedVariable(DV, Ctx);
+        if (AbstractVariables.lookup(CleanDV))
+          continue;
         if (LexicalScope *Scope = LScopes.findAbstractScope(DV.getContext()))
           addScopeVariable(Scope, new DbgVariable(DV, NULL));
       }

diff --git a/test/DebugInfo/inlined-vars.ll b/test/DebugInfo/inlined-vars.ll
new file mode 100644 (file)
index 0000000..ed4e7da
--- /dev/null
+++ b/test/DebugInfo/inlined-vars.ll
@@ -0,0 +1,57 @@
+; RUN: llc -O0 < %s | FileCheck %s -check-prefix ARGUMENT
+; RUN: llc -O0 < %s | FileCheck %s -check-prefix VARIABLE
+; PR 13202
+
+define i32 @main() uwtable {
+entry:
+  tail call void @llvm.dbg.value(metadata !2, i64 0, metadata !18), !dbg !21
+  tail call void @llvm.dbg.value(metadata !2, i64 0, metadata !22), !dbg !23
+  tail call void @smth(i32 0), !dbg !24
+  tail call void @smth(i32 0), !dbg !25
+  ret i32 0, !dbg !19
+}
+
+declare void @smth(i32)
+
+declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{i32 786449, i32 0, i32 4, metadata !"inline-bug.cc", metadata !"/tmp/dbginfo/pr13202", metadata !"clang version 3.2 (trunk 159419)", i1 true, i1 true, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !1} ; [ DW_TAG_compile_unit ]
+!1 = metadata !{metadata !2}
+!2 = metadata !{i32 0}
+!3 = metadata !{metadata !4}
+!4 = metadata !{metadata !5, metadata !10}
+!5 = metadata !{i32 786478, i32 0, metadata !6, metadata !"main", metadata !"main", metadata !"", metadata !6, i32 10, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 ()* @main, null, null, metadata !1, i32 10} ; [ DW_TAG_subprogram ]
+!6 = metadata !{i32 786473, metadata !"inline-bug.cc", metadata !"/tmp/dbginfo/pr13202", null} ; [ DW_TAG_file_type ]
+!7 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+!8 = metadata !{metadata !9}
+!9 = metadata !{i32 786468, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+!10 = metadata !{i32 786478, i32 0, metadata !6, metadata !"f", metadata !"f", metadata !"_ZL1fi", metadata !6, i32 3, metadata !11, i1 true, i1 true, i32 0, i32 0, null, i32 256, i1 true, null, null, null, metadata !13, i32 3} ; [ DW_TAG_subprogram ]
+!11 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !12, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
+!12 = metadata !{metadata !9, metadata !9}
+!13 = metadata !{metadata !14}
+!14 = metadata !{metadata !15, metadata !16}
+!15 = metadata !{i32 786689, metadata !10, metadata !"argument", metadata !6, i32 16777219, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ]
+
+; Two DW_TAG_formal_parameter: one abstract and one inlined.
+; ARGUMENT: {{.*Abbrev.*DW_TAG_formal_parameter}}
+; ARGUMENT: {{.*Abbrev.*DW_TAG_formal_parameter}}
+; ARGUMENT-NOT: {{.*Abbrev.*DW_TAG_formal_parameter}}
+
+!16 = metadata !{i32 786688, metadata !17, metadata !"local", metadata !6, i32 4, metadata !9, i32 0, i32 0} ; [ DW_TAG_auto_variable ]
+
+; Two DW_TAG_variable: one abstract and one inlined.
+; VARIABLE: {{.*Abbrev.*DW_TAG_variable}}
+; VARIABLE: {{.*Abbrev.*DW_TAG_variable}}
+; VARIABLE-NOT: {{.*Abbrev.*DW_TAG_variable}}
+
+!17 = metadata !{i32 786443, metadata !10, i32 3, i32 35, metadata !6, i32 1} ; [ DW_TAG_lexical_block ]
+!18 = metadata !{i32 786689, metadata !10, metadata !"argument", metadata !6, i32 16777219, metadata !9, i32 0, metadata !19} ; [ DW_TAG_arg_variable ]
+!19 = metadata !{i32 11, i32 10, metadata !20, null}
+!20 = metadata !{i32 786443, metadata !5, i32 10, i32 12, metadata !6, i32 0} ; [ DW_TAG_lexical_block ]
+!21 = metadata !{i32 3, i32 25, metadata !10, metadata !19}
+!22 = metadata !{i32 786688, metadata !17, metadata !"local", metadata !6, i32 4, metadata !9, i32 0, metadata !19} ; [ DW_TAG_auto_variable ]
+!23 = metadata !{i32 4, i32 16, metadata !17, metadata !19}
+!24 = metadata !{i32 5, i32 3, metadata !17, metadata !19}
+!25 = metadata !{i32 6, i32 3, metadata !17, metadata !19}