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Backport r318289 to fix a debuginfo issue with rust.

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Tom Stellard 2017-11-22 00:46:10 +00:00
parent c5c125e0d4
commit 2839cf60b0
2 changed files with 158 additions and 1 deletions
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153
0001-DebugInfo-Fix-potential-CU-mismatch-for-SubprogramSc.patch Normal file
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@ -0,0 +1,153 @@
From fd80342a58ead0dc7b008ce6ce8523cdea765f5f Mon Sep 17 00:00:00 2001
From: Jonas Devlieghere <jonas@devlieghere.com>
Date: Wed, 15 Nov 2017 10:57:05 +0000
Subject: [PATCH] [DebugInfo] Fix potential CU mismatch for
SubprogramScopeDIEs.
In constructAbstractSubprogramScopeDIE there can be a potential mismatch
between `this` and the CU of ContextDIE when a scope is shared between
two DISubprograms belonging to a different CU. In that case, `this` is
the CU that was specified in the IR, but the CU of ContextDIE is that of
the first subprogram that was emitted. This patch fixes the mismatch by
looking up the CU of ContextDIE, and switching to use that.
This fixes PR35212 (https://bugs.llvm.org/show_bug.cgi?id=35212)
Patch by Philip Craig!
Differential revision: https://reviews.llvm.org/D39981
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318289 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp | 20 ++++++++----
lib/CodeGen/AsmPrinter/DwarfDebug.h | 6 +++-
test/DebugInfo/cross-cu-scope.ll | 50 +++++++++++++++++++++++++++++
3 files changed, 68 insertions(+), 8 deletions(-)
create mode 100644 test/DebugInfo/cross-cu-scope.ll
diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index d904372..eea30a7 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -616,6 +616,7 @@ void DwarfCompileUnit::constructAbstractSubprogramScopeDIE(
auto *SP = cast<DISubprogram>(Scope->getScopeNode());
DIE *ContextDIE;
+ DwarfCompileUnit *ContextCU = this;
if (includeMinimalInlineScopes())
ContextDIE = &getUnitDie();
@@ -626,18 +627,23 @@ void DwarfCompileUnit::constructAbstractSubprogramScopeDIE(
else if (auto *SPDecl = SP->getDeclaration()) {
ContextDIE = &getUnitDie();
getOrCreateSubprogramDIE(SPDecl);
- } else
+ } else {
ContextDIE = getOrCreateContextDIE(resolve(SP->getScope()));
+ // The scope may be shared with a subprogram that has already been
+ // constructed in another CU, in which case we need to construct this
+ // subprogram in the same CU.
+ ContextCU = DD->lookupCU(ContextDIE->getUnitDie());
+ }
// Passing null as the associated node because the abstract definition
// shouldn't be found by lookup.
- AbsDef = &createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, nullptr);
- applySubprogramAttributesToDefinition(SP, *AbsDef);
+ AbsDef = &ContextCU->createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, nullptr);
+ ContextCU->applySubprogramAttributesToDefinition(SP, *AbsDef);
- if (!includeMinimalInlineScopes())
- addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
- if (DIE *ObjectPointer = createAndAddScopeChildren(Scope, *AbsDef))
- addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
+ if (!ContextCU->includeMinimalInlineScopes())
+ ContextCU->addUInt(*AbsDef, dwarf::DW_AT_inline, None, dwarf::DW_INL_inlined);
+ if (DIE *ObjectPointer = ContextCU->createAndAddScopeChildren(Scope, *AbsDef))
+ ContextCU->addDIEEntry(*AbsDef, dwarf::DW_AT_object_pointer, *ObjectPointer);
}
DIE *DwarfCompileUnit::constructImportedEntityDIE(
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 253e3f0..9ade921 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -280,7 +280,7 @@ class DwarfDebug : public DebugHandlerBase {
// 0, referencing the comp_dir of all the type units that use it.
MCDwarfDwoLineTable SplitTypeUnitFileTable;
/// @}
-
+
/// True iff there are multiple CUs in this module.
bool SingleCU;
bool IsDarwin;
@@ -555,6 +555,10 @@ public:
/// A helper function to check whether the DIE for a given Scope is
/// going to be null.
bool isLexicalScopeDIENull(LexicalScope *Scope);
+
+ /// Find the matching DwarfCompileUnit for the given CU DIE.
+ DwarfCompileUnit *lookupCU(const DIE *Die) { return CUDieMap.lookup(Die); }
+
};
} // End of namespace llvm
diff --git a/test/DebugInfo/cross-cu-scope.ll b/test/DebugInfo/cross-cu-scope.ll
new file mode 100644
index 0000000..7c71f27
--- /dev/null
+++ b/test/DebugInfo/cross-cu-scope.ll
@@ -0,0 +1,50 @@
+; RUN: %llc_dwarf %s -filetype=obj -o %t
+; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
+
+; Reduced test case from PR35212. Two DISubprogram belong to a different CU but
+; share a scope. Both are declarations and end up in the scope's CU. We want to
+; check that the CU from the context DIE is used (rather than from the IR).
+; This manifests itself by the DW_base_type ending up in the second CU, rather
+; than in the first one as specified in the IR.
+
+; CHECK: DW_TAG_compile_unit
+; CHECK-NEXT: discriminator 0
+; CHECK: DW_TAG_compile_unit
+; CHECK-NEXT: discriminator 1
+; CHECK: DW_TAG_structure_type
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_subprogram
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_formal_parameter
+; CHECK-NOT: NULL
+; CHECK: DW_AT_type{{.*}}{[[USIZE_LABEL:0x[0-9a-f]+]]}
+; CHECK: NULL
+; CHECK: [[USIZE_LABEL]]: DW_TAG_base_type
+; CHECK-NOT: NULL
+; CHECK: DW_AT_name{{.*}}"usize"
+
+define hidden void @foo() !dbg !4 {
+ ret void, !dbg !7
+}
+
+!llvm.dbg.cu = !{!0, !2}
+!llvm.module.flags = !{!3}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_Rust, file: !1, producer: "clang LLVM (rustc version 1.23.0-nightly (discriminator 0))", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
+!1 = !DIFile(filename: "../lib.rs", directory: "/home/alex/code/rust4/lol")
+!2 = distinct !DICompileUnit(language: DW_LANG_Rust, file: !1, producer: "clang LLVM (rustc version 1.23.0-nightly (discriminator 1))", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = distinct !DISubprogram(name: "clone<alloc::string::String>", linkageName: "_ZN5alloc3vec8{{impl}}28clone<alloc::string::String>E", scope: null, file: !1, line: 1519, type: !5, isLocal: false, isDefinition: true, scopeLine: 1519, flags: DIFlagPrototyped, isOptimized: true, unit: !0, templateParams: !6, variables: !6)
+!5 = !DISubroutineType(types: !6)
+!6 = !{}
+!7 = !DILocation(line: 1612, scope: !8, inlinedAt: !11)
+!8 = distinct !DILexicalBlock(scope: !9, file: !1, line: 86, column: 12)
+!9 = distinct !DISubprogram(name: "allocate_in<alloc::string::String,alloc::heap::Heap>", linkageName: "_ZN5alloc7raw_vec8{{impl}}52allocate_in<alloc::string::String,alloc::heap::Heap>E", scope: !10, file: !1, line: 82, type: !5, isLocal: false, isDefinition: true, scopeLine: 82, flags: DIFlagPrototyped, isOptimized: true, unit: !2, templateParams: !6, variables: !6)
+!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "RawVec<alloc::string::String, alloc::heap::Heap>", file: !1, size: 128, align: 64, elements: !6, identifier: "5c6e4db16d2c64555e40661d70c4d81e")
+!11 = distinct !DILocation(line: 86, scope: !8, inlinedAt: !12)
+!12 = distinct !DILocation(line: 141, scope: !13, inlinedAt: !17)
+!13 = distinct !DISubprogram(name: "with_capacity<alloc::string::String>", linkageName: "_ZN5alloc7raw_vec8{{impl}}36with_capacity<alloc::string::String>E", scope: !10, file: !1, line: 140, type: !5, isLocal: false, isDefinition: true, scopeLine: 140, flags: DIFlagPrototyped, isOptimized: true, unit: !0, templateParams: !6, variables: !14)
+!14 = !{!15}
+!15 = !DILocalVariable(name: "cap", arg: 1, scope: !13, file: !1, line: 1, type: !16)
+!16 = !DIBasicType(name: "usize", size: 64, encoding: DW_ATE_unsigned)
+!17 = !DILocation(line: 1521, scope: !4)
--
2.9.3

6
llvm.spec
View file

@ -9,7 +9,7 @@
Name: llvm Name: llvm
Version: 4.0.1 Version: 4.0.1
Release: 6%{?dist} Release: 7%{?dist}
Summary: The Low Level Virtual Machine Summary: The Low Level Virtual Machine
License: NCSA License: NCSA
@ -23,6 +23,7 @@ Patch3: 0001-CMake-Split-static-library-exports-into-their-own-ex.patch
Patch4: 0001-Revert-Revert-CMake-Move-sphinx-detection-into-AddSp.patch Patch4: 0001-Revert-Revert-CMake-Move-sphinx-detection-into-AddSp.patch
Patch5: 0001-CMake-Fix-docs-llvm-man-target-when-clang-llvm-is-in.patch Patch5: 0001-CMake-Fix-docs-llvm-man-target-when-clang-llvm-is-in.patch
Patch6: 0001-CMake-Add-LLVM_UTILS_INSTALL_DIR-option.patch Patch6: 0001-CMake-Add-LLVM_UTILS_INSTALL_DIR-option.patch
Patch7: 0001-DebugInfo-Fix-potential-CU-mismatch-for-SubprogramSc.patch
BuildRequires: cmake BuildRequires: cmake
BuildRequires: zlib-devel BuildRequires: zlib-devel
@ -212,6 +213,9 @@ fi
%{_libdir}/cmake/llvm/LLVMStaticExports.cmake %{_libdir}/cmake/llvm/LLVMStaticExports.cmake
%changelog %changelog
* Tue Nov 21 2017 Tom Stellard <tstellar@redhat.com> - 4.0.1-7
- Backport r318289 to fix a debuginfo issue with rust.
* Mon Sep 18 2017 Tom Stellard <tstellar@redhat.com> - 4.0.1-6 * Mon Sep 18 2017 Tom Stellard <tstellar@redhat.com> - 4.0.1-6
- Add Requires: libedit-devel for llvm-devel - Add Requires: libedit-devel for llvm-devel