[Lldb-commits] [lldb] 20c2f94 - [lldb][COFF] Match symbols from COFF symbol table to export symbols
Martin Storsjö via lldb-commits
lldb-commits at lists.llvm.org
Wed Sep 28 02:58:19 PDT 2022
Author: Alvin Wong
Date: 2022-09-28T12:57:11+03:00
New Revision: 20c2f94c3cc10c41ab45e1be156540a06306cdf1
URL: https://github.com/llvm/llvm-project/commit/20c2f94c3cc10c41ab45e1be156540a06306cdf1
DIFF: https://github.com/llvm/llvm-project/commit/20c2f94c3cc10c41ab45e1be156540a06306cdf1.diff
LOG: [lldb][COFF] Match symbols from COFF symbol table to export symbols
If a symbol is the same as an export symbol, mark it as 'Additional' to
prevent the duplicated symbol from being repeated in some commands (e.g.
`disas -n func`). If the RVA is the same but exported with a different
name, only synchronize the symbol types.
Reviewed By: labath
Differential Revision: https://reviews.llvm.org/D134426
Added:
Modified:
lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h
lldb/test/Shell/ObjectFile/PECOFF/symbols-export-table.yaml
Removed:
################################################################################
diff --git a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
index 613938161df5d..0a2777a193c80 100644
--- a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
+++ b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
@@ -761,12 +761,18 @@ llvm::StringRef ObjectFilePECOFF::GetSectionName(const section_header_t §) {
void ObjectFilePECOFF::ParseSymtab(Symtab &symtab) {
SectionList *sect_list = GetSectionList();
- AppendFromExportTable(sect_list, symtab);
- AppendFromCOFFSymbolTable(sect_list, symtab);
+ rva_symbol_list_t sorted_exports = AppendFromExportTable(sect_list, symtab);
+ AppendFromCOFFSymbolTable(sect_list, symtab, sorted_exports);
}
-void ObjectFilePECOFF::AppendFromCOFFSymbolTable(SectionList *sect_list,
- Symtab &symtab) {
+static bool RVASymbolListCompareRVA(const std::pair<uint32_t, uint32_t> &a,
+ const std::pair<uint32_t, uint32_t> &b) {
+ return a.first < b.first;
+}
+
+void ObjectFilePECOFF::AppendFromCOFFSymbolTable(
+ SectionList *sect_list, Symtab &symtab,
+ const ObjectFilePECOFF::rva_symbol_list_t &sorted_exports) {
const uint32_t num_syms = m_binary->getNumberOfSymbols();
if (num_syms == 0)
return;
@@ -795,22 +801,52 @@ void ObjectFilePECOFF::AppendFromCOFFSymbolTable(SectionList *sect_list,
if (section_number >= 1) {
symbol.GetAddressRef() = Address(
sect_list->FindSectionByID(section_number), coff_sym_ref.getValue());
- symbol.SetType(MapSymbolType(coff_sym_ref.getType()));
+ const auto symbol_type = MapSymbolType(coff_sym_ref.getType());
+ symbol.SetType(symbol_type);
+
+ // Check for duplicate of exported symbols:
+ const uint32_t symbol_rva = symbol.GetAddressRef().GetFileAddress() -
+ m_coff_header_opt.image_base;
+ const auto &first_match = std::lower_bound(
+ sorted_exports.begin(), sorted_exports.end(),
+ std::make_pair(symbol_rva, 0), RVASymbolListCompareRVA);
+ for (auto it = first_match;
+ it != sorted_exports.end() && it->first == symbol_rva; ++it) {
+ Symbol *exported = symtab.SymbolAtIndex(it->second);
+ if (symbol_type != lldb::eSymbolTypeInvalid)
+ exported->SetType(symbol_type);
+ if (exported->GetMangled() == symbol.GetMangled()) {
+ symbol.SetExternal(true);
+ // We don't want the symbol to be duplicated (e.g. when running
+ // `disas -n func`), but we also don't want to erase this entry (to
+ // preserve the original symbol order), so we mark it as additional.
+ symbol.SetType(lldb::eSymbolTypeAdditional);
+ } else {
+ // It is possible for a symbol to be exported in a
diff erent name
+ // from its original. In this case keep both entries so lookup using
+ // either names will work. If this symbol has an invalid type, replace
+ // it with the type from the export symbol.
+ if (symbol.GetType() == lldb::eSymbolTypeInvalid)
+ symbol.SetType(exported->GetType());
+ }
+ }
}
symtab.AddSymbol(symbol);
}
}
-void ObjectFilePECOFF::AppendFromExportTable(SectionList *sect_list,
- Symtab &symtab) {
+ObjectFilePECOFF::rva_symbol_list_t
+ObjectFilePECOFF::AppendFromExportTable(SectionList *sect_list,
+ Symtab &symtab) {
const auto *export_table = m_binary->getExportTable();
if (!export_table)
- return;
+ return {};
const uint32_t num_syms = export_table->AddressTableEntries;
if (num_syms == 0)
- return;
+ return {};
Log *log = GetLog(LLDBLog::Object);
+ rva_symbol_list_t export_list;
symtab.Reserve(symtab.GetNumSymbols() + num_syms);
// Read each export table entry, ordered by ordinal instead of by name.
for (const auto &entry : m_binary->export_directories()) {
@@ -851,8 +887,12 @@ void ObjectFilePECOFF::AppendFromExportTable(SectionList *sect_list,
if (section_sp->GetPermissions() & ePermissionsExecutable)
symbol.SetType(lldb::eSymbolTypeCode);
symbol.SetExternal(true);
- symtab.AddSymbol(symbol);
+ uint32_t idx = symtab.AddSymbol(symbol);
+ export_list.push_back(std::make_pair(function_rva, idx));
}
+ std::stable_sort(export_list.begin(), export_list.end(),
+ RVASymbolListCompareRVA);
+ return export_list;
}
std::unique_ptr<CallFrameInfo> ObjectFilePECOFF::CreateCallFrameInfo() {
diff --git a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h
index f29da9773d9c3..e3c48adfc6c1a 100644
--- a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h
+++ b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.h
@@ -268,10 +268,12 @@ class ObjectFilePECOFF : public lldb_private::ObjectFile {
private:
bool CreateBinary();
+ typedef std::vector<std::pair<uint32_t, uint32_t>> rva_symbol_list_t;
void AppendFromCOFFSymbolTable(lldb_private::SectionList *sect_list,
- lldb_private::Symtab &symtab);
- void AppendFromExportTable(lldb_private::SectionList *sect_list,
- lldb_private::Symtab &symtab);
+ lldb_private::Symtab &symtab,
+ const rva_symbol_list_t &sorted_exports);
+ rva_symbol_list_t AppendFromExportTable(lldb_private::SectionList *sect_list,
+ lldb_private::Symtab &symtab);
dos_header_t m_dos_header;
coff_header_t m_coff_header;
diff --git a/lldb/test/Shell/ObjectFile/PECOFF/symbols-export-table.yaml b/lldb/test/Shell/ObjectFile/PECOFF/symbols-export-table.yaml
index f136db38f2a1d..dd21cad5f58d2 100644
--- a/lldb/test/Shell/ObjectFile/PECOFF/symbols-export-table.yaml
+++ b/lldb/test/Shell/ObjectFile/PECOFF/symbols-export-table.yaml
@@ -4,18 +4,18 @@
# Checks that the symtab contains both symbols from the export table and the
# COFF symbol table.
-# CHECK: UserID DSX Type File Address/Value {{.*}} Size Flags Name
+# CHECK: UserID DSX Type File Address/Value {{.*}} Size Flags Name
# CHECK-NEXT: ------
-# CHECK-NEXT: 1 X Code 0x0000000180001020 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportFnAlias
-# CHECK-NEXT: 2 X Code 0x0000000180001010 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportFunc
-# CHECK-NEXT: 3 X Data 0x0000000180003000 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportInt
-# CHECK-NEXT: 4 X Data 0x0000000180003004 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportIntAlias
-# CHECK-NEXT: 4294967295 Code 0x0000000180001000 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} entry
-# CHECK-NEXT: 4294967295 Code 0x0000000180001010 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportFunc
-# CHECK-NEXT: 4294967295 Code 0x0000000180001020 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} aliasFunc
-# CHECK-NEXT: 4294967295 Invalid 0x0000000180003000 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportInt
-# CHECK-NEXT: 4294967295 Invalid 0x0000000180003004 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} aliasInt
-# CHECK-NEXT: 4294967295 Invalid 0x0000000180003008 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} internalInt
+# CHECK-NEXT: 1 X Code 0x0000000180001020 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportFnAlias
+# CHECK-NEXT: 2 X Code 0x0000000180001010 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportFunc
+# CHECK-NEXT: 3 X Data 0x0000000180003000 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportInt
+# CHECK-NEXT: 4 X Data 0x0000000180003004 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportIntAlias
+# CHECK-NEXT: 4294967295 Code 0x0000000180001000 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} entry
+# CHECK-NEXT: 4294967295 X Additional 0x0000000180001010 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportFunc
+# CHECK-NEXT: 4294967295 Code 0x0000000180001020 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} aliasFunc
+# CHECK-NEXT: 4294967295 X Additional 0x0000000180003000 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} exportInt
+# CHECK-NEXT: 4294967295 Data 0x0000000180003004 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} aliasInt
+# CHECK-NEXT: 4294967295 Invalid 0x0000000180003008 0x{{[0-9a-f]+}} 0x{{[0-9a-f]+}} internalInt
# CHECK-EMPTY:
# Test file generated with:
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