[lld] 98bc304 - [lld][COFF] Fix TypeServerSource lookup on GUID collisions
Tobias Hieta via llvm-commits
llvm-commits at lists.llvm.org
Sat Apr 2 01:09:12 PDT 2022
Author: Tobias Hieta
Date: 2022-04-02T10:09:07+02:00
New Revision: 98bc304e9faded44f1d8988ffa4c5d8b50c759ec
URL: https://github.com/llvm/llvm-project/commit/98bc304e9faded44f1d8988ffa4c5d8b50c759ec
DIFF: https://github.com/llvm/llvm-project/commit/98bc304e9faded44f1d8988ffa4c5d8b50c759ec.diff
LOG: [lld][COFF] Fix TypeServerSource lookup on GUID collisions
Microsoft shipped a bunch of PDB files with broken/invalid GUIDs
which lead lld to use 0xFF as the key for these files in an internal
cache. When multiple files have this key it will lead to collisions
and confused symbol lookup.
Several approaches to fix this was considered. Including making the key
the path to the PDB file, but this requires some filesystem operations
in order to normalize the file path.
Since this only happens with malformatted PDB files and we haven't
seen this before they malformatted files where shipped with visual
studio we probably shouldn't optimize for this use-case.
Instead we now just don't insert files with Guid == 0xFF into the
cache map and warn if we get collisions so similar problems can be
found in the future instead of being silent.
Discussion about the root issue and the approach to this fix can be found on Github: https://github.com/llvm/llvm-project/issues/54487
Reviewed By: aganea
Differential Revision: https://reviews.llvm.org/D122372
Added:
lld/test/COFF/Inputs/pdb-type-server-guid-collision-a-pdb.yaml
lld/test/COFF/Inputs/pdb-type-server-guid-collision-a.yaml
lld/test/COFF/Inputs/pdb-type-server-guid-collision-b-pdb.yaml
lld/test/COFF/Inputs/pdb-type-server-guid-collision-b.yaml
lld/test/COFF/pdb-type-server-guid-collision-invalid.test
lld/test/COFF/pdb-type-server-guid-collision-valid.test
Modified:
lld/COFF/DebugTypes.cpp
Removed:
################################################################################
diff --git a/lld/COFF/DebugTypes.cpp b/lld/COFF/DebugTypes.cpp
index 67b708c5b36a7..3b3f43f1bf15b 100644
--- a/lld/COFF/DebugTypes.cpp
+++ b/lld/COFF/DebugTypes.cpp
@@ -56,8 +56,15 @@ class TypeServerSource : public TpiSource {
return;
Guid = expectedInfo->getGuid();
auto it = ctx.typeServerSourceMappings.emplace(Guid, this);
- assert(it.second);
- (void)it;
+ if (!it.second) {
+ // If we hit here we have collision on Guid's in two PDB files.
+ // This can happen if the PDB Guid is invalid or if we are really
+ // unlucky. This should fall back on stright file-system lookup.
+ TypeServerSource *tSrc = (TypeServerSource *)it.first->second;
+ log("GUID collision between " + file.getFilePath() + " and " +
+ tSrc->pdbInputFile->session->getPDBFile().getFilePath());
+ ctx.typeServerSourceMappings.erase(Guid);
+ }
}
Error mergeDebugT(TypeMerger *m) override;
diff --git a/lld/test/COFF/Inputs/pdb-type-server-guid-collision-a-pdb.yaml b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-a-pdb.yaml
new file mode 100644
index 0000000000000..5092a4102f827
--- /dev/null
+++ b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-a-pdb.yaml
@@ -0,0 +1,1018 @@
+---
+PdbStream:
+ Age: 1
+ Guid: '{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}'
+ Features: [ VC140 ]
+ Version: VC70
+TpiStream:
+ Version: VC80
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+ Name: '__vc_attributes::moduleAttribute::type_e'
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diff --git a/lld/test/COFF/Inputs/pdb-type-server-guid-collision-a.yaml b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-a.yaml
new file mode 100644
index 0000000000000..1881d85ce76cd
--- /dev/null
+++ b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-a.yaml
@@ -0,0 +1,171 @@
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diff --git a/lld/test/COFF/Inputs/pdb-type-server-guid-collision-b-pdb.yaml b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-b-pdb.yaml
new file mode 100644
index 0000000000000..55e8b616ca36f
--- /dev/null
+++ b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-b-pdb.yaml
@@ -0,0 +1,1018 @@
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diff --git a/lld/test/COFF/Inputs/pdb-type-server-guid-collision-b.yaml b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-b.yaml
new file mode 100644
index 0000000000000..54e12527ae228
--- /dev/null
+++ b/lld/test/COFF/Inputs/pdb-type-server-guid-collision-b.yaml
@@ -0,0 +1,171 @@
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: [ ]
+sections:
+ - Name: .drectve
+ Characteristics: [ IMAGE_SCN_LNK_INFO, IMAGE_SCN_LNK_REMOVE ]
+ Alignment: 1
+ SectionData: 2020202F44454641554C544C49423A224C4942434D5422202F44454641554C544C49423A224F4C444E414D45532220
+ - Name: '.debug$S'
+ Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+ Alignment: 1
+ Subsections:
+ - !Symbols
+ Records:
+ - Kind: S_OBJNAME
+ ObjNameSym:
+ Signature: 0
+ ObjectName: 'C:\Users\tobia\code\tmp\b.obj'
+ - Kind: S_COMPILE3
+ Compile3Sym:
+ Flags: [ SecurityChecks, HotPatch ]
+ Machine: X64
+ FrontendMajor: 19
+ FrontendMinor: 29
+ FrontendBuild: 30140
+ FrontendQFE: 0
+ BackendMajor: 19
+ BackendMinor: 29
+ BackendBuild: 30140
+ BackendQFE: 0
+ Version: 'Microsoft (R) Optimizing Compiler'
+ - Kind: S_UNAMESPACE
+ UsingNamespaceSym:
+ Namespace: __vc_attributes
+ - Kind: S_UNAMESPACE
+ UsingNamespaceSym:
+ Namespace: helper_attributes
+ - Kind: S_UNAMESPACE
+ UsingNamespaceSym:
+ Namespace: atl
+ - Kind: S_UNAMESPACE
+ UsingNamespaceSym:
+ Namespace: std
+ - !Symbols
+ Records:
+ - Kind: S_GDATA32
+ DataSym:
+ Type: 4098
+ DisplayName: bar_gv
+ - Kind: S_UDT
+ UDTSym:
+ Type: 4098
+ UDTName: Bar
+ - !StringTable
+ Strings: []
+ - !Symbols
+ Records:
+ - Kind: S_BUILDINFO
+ BuildInfoSym:
+ BuildId: 4122
+ Relocations:
+ - VirtualAddress: 184
+ SymbolName: '?bar_gv@@3UBar@@A'
+ Type: IMAGE_REL_AMD64_SECREL
+ - VirtualAddress: 188
+ SymbolName: '?bar_gv@@3UBar@@A'
+ Type: IMAGE_REL_AMD64_SECTION
+ - Name: '.debug$T'
+ Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
+ Alignment: 1
+ Types:
+ - Kind: LF_TYPESERVER2
+ TypeServer2:
+ Guid: '{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}'
+ Age: 1
+ Name: 'C:\Users\tobia\code\tmp\b.pdb'
+ - Name: .bss
+ Characteristics: [ IMAGE_SCN_CNT_UNINITIALIZED_DATA, IMAGE_SCN_MEM_READ, IMAGE_SCN_MEM_WRITE ]
+ Alignment: 4
+ SectionData: ''
+ SizeOfRawData: 4
+ - Name: .chks64
+ Characteristics: [ IMAGE_SCN_LNK_INFO, IMAGE_SCN_LNK_REMOVE ]
+ SectionData: 23076615271ABF1A7B0457106301BDC96209C2204ABFB8A500000000000000000000000000000000
+symbols:
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+ Value: 17135036
+ SectionNumber: -1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ - Name: '@feat.00'
+ Value: 2147549584
+ SectionNumber: -1
+ SimpleType: IMAGE_SYM_TYPE_NULL
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+ - Name: '@vol.md'
+ Value: 2
+ SectionNumber: -1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ - Name: .drectve
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 47
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 0
+ - Name: '.debug$S'
+ Value: 0
+ SectionNumber: 2
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 1060
+ NumberOfRelocations: 2
+ NumberOfLinenumbers: 0
+ CheckSum: 0
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+ Value: 0
+ SectionNumber: 3
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
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+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 0
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+ Value: 0
+ SectionNumber: 4
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 4
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 0
+ - Name: '?bar_gv@@3UBar@@A'
+ Value: 0
+ SectionNumber: 4
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+ - Name: .chks64
+ Value: 0
+ SectionNumber: 5
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 40
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 0
+...
diff --git a/lld/test/COFF/pdb-type-server-guid-collision-invalid.test b/lld/test/COFF/pdb-type-server-guid-collision-invalid.test
new file mode 100644
index 0000000000000..d73695577de81
--- /dev/null
+++ b/lld/test/COFF/pdb-type-server-guid-collision-invalid.test
@@ -0,0 +1,20 @@
+Check that the linker behaves when you have multiple
+PDB files with the same Guid. This was first a problem
+with Visual Studio 2022 that shipped PDB's with Guid's
+that was set to FFFFFF...
+
+RUN: rm -rf %t && mkdir -p %t && cd %t
+RUN: yaml2obj %p/Inputs/pdb-type-server-guid-collision-a.yaml -o a.obj
+RUN: yaml2obj %p/Inputs/pdb-type-server-guid-collision-b.yaml -o b.obj
+RUN: llvm-pdbutil yaml2pdb %S/Inputs/pdb-type-server-guid-collision-a-pdb.yaml -pdb a.pdb
+RUN: llvm-pdbutil yaml2pdb %S/Inputs/pdb-type-server-guid-collision-b-pdb.yaml -pdb b.pdb
+RUN: lld-link a.obj b.obj -out:collision.dll /debug:ghash -pdb:collision.pdb -nodefaultlib /noentry /dll
+RUN: lld-link a.obj b.obj -out:collision.dll /debug:noghash -pdb:collision_noghash.pdb -nodefaultlib /noentry /dll
+RUN: llvm-pdbutil dump -globals collision.pdb | FileCheck %s
+RUN: llvm-pdbutil dump -globals collision_noghash.pdb | FileCheck %s
+
+CHECK-LABEL: Global Symbols
+CHECK: ============================================================
+
+CHECK: 100 | S_GDATA32 [size = 24] `bar_gv`
+CHECK-NEXT: type = 0x104E (Bar), addr = 0002:0004
diff --git a/lld/test/COFF/pdb-type-server-guid-collision-valid.test b/lld/test/COFF/pdb-type-server-guid-collision-valid.test
new file mode 100644
index 0000000000000..115168c4cf79b
--- /dev/null
+++ b/lld/test/COFF/pdb-type-server-guid-collision-valid.test
@@ -0,0 +1,19 @@
+Check that the linker behaves when you have multiple
+PDB files with the same Guid. This checks the case
+where the Guids are duplicates but not invalid (i.e. not FFFFFF)
+
+RUN: rm -rf %t && mkdir -p %t && cd %t
+RUN: sed s/{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}/{6C633EB7-46FE-4609-BA83-EB820E6F5683}/ %S/Inputs/pdb-type-server-guid-collision-a.yaml | yaml2obj > a.obj
+RUN: sed s/{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}/{6C633EB7-46FE-4609-BA83-EB820E6F5683}/ %S/Inputs/pdb-type-server-guid-collision-b.yaml | yaml2obj > b.obj
+RUN: sed s/{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}/{6C633EB7-46FE-4609-BA83-EB820E6F5683}/ %S/Inputs/pdb-type-server-guid-collision-a-pdb.yaml | llvm-pdbutil yaml2pdb - -pdb a.pdb
+RUN: sed s/{FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}/{6C633EB7-46FE-4609-BA83-EB820E6F5683}/ %S/Inputs/pdb-type-server-guid-collision-b-pdb.yaml | llvm-pdbutil yaml2pdb - -pdb b.pdb
+RUN: lld-link a.obj b.obj -out:collision.dll -debug -pdb:collision.pdb -nodefaultlib /noentry /dll -verbose 2>&1 | FileCheck %s -check-prefix LOG
+RUN: llvm-pdbutil dump -globals collision.pdb | FileCheck %s -check-prefix DUMP
+
+LOG: lld-link: GUID collision between b.pdb and a.pdb
+
+DUMP-LABEL: Global Symbols
+DUMP: ============================================================
+
+DUMP: 100 | S_GDATA32 [size = 24] `bar_gv`
+DUMP-NEXT: type = 0x104E (Bar), addr = 0002:0004
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