This revision was automatically updated to reflect the committed changes.
Closed by commit rG268089b6ac4b: Fix the encoding and decoding of
UniqueCStringMap<T> objects when saved to… (authored by clayborg).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D124572/new/
https://reviews.llvm.org/D124572
Files:
lldb/source/Plugins/SymbolFile/DWARF/NameToDIE.cpp
lldb/source/Symbol/Symtab.cpp
lldb/unittests/Symbol/SymtabTest.cpp
Index: lldb/unittests/Symbol/SymtabTest.cpp
===================================================================
--- lldb/unittests/Symbol/SymtabTest.cpp
+++ lldb/unittests/Symbol/SymtabTest.cpp
@@ -303,3 +303,417 @@
module_symtab->PreloadSymbols();
EncodeDecode(*module_symtab);
}
+
+TEST_F(SymtabTest, TestDecodeCStringMaps) {
+ // Symbol tables save out the symbols, but they also save out the symbol table
+ // name indexes. These name indexes are a map of sorted ConstString + T pairs
+ // and when they are decoded from a file, they are no longer sorted since
+ // ConstString objects can be sorted by "const char *" and the order in which
+ // these strings are created won't be the same in a new process. We need to
+ // ensure these name lookups happen correctly when we load the name indexes,
+ // so this test loads a symbol table from a cache file from
+ // "lldb/unittests/Symbol/Inputs/indexnames-symtab-cache" and make sure we
+ // can correctly lookup each of the names in the symbol table.
+ auto ExpectedFile = TestFile::fromYaml(R"(
+--- !mach-o
+FileHeader:
+ magic: 0xFEEDFACF
+ cputype: 0x100000C
+ cpusubtype: 0x0
+ filetype: 0x2
+ ncmds: 16
+ sizeofcmds: 744
+ flags: 0x200085
+ reserved: 0x0
+LoadCommands:
+ - cmd: LC_SEGMENT_64
+ cmdsize: 72
+ segname: __PAGEZERO
+ vmaddr: 0
+ vmsize: 4294967296
+ fileoff: 0
+ filesize: 0
+ maxprot: 0
+ initprot: 0
+ nsects: 0
+ flags: 0
+ - cmd: LC_SEGMENT_64
+ cmdsize: 232
+ segname: __TEXT
+ vmaddr: 4294967296
+ vmsize: 16384
+ fileoff: 0
+ filesize: 16384
+ maxprot: 5
+ initprot: 5
+ nsects: 2
+ flags: 0
+ Sections:
+ - sectname: __text
+ segname: __TEXT
+ addr: 0x100003F64
+ size: 76
+ offset: 0x3F64
+ align: 2
+ reloff: 0x0
+ nreloc: 0
+ flags: 0x80000400
+ reserved1: 0x0
+ reserved2: 0x0
+ reserved3: 0x0
+ content: 80018052C0035FD6E0028052C0035FD640048052C0035FD6FF8300D1FD7B01A9FD43009108008052E80B00B9BFC31FB8F4FFFF97F5FFFF97F6FFFF97E00B40B9FD7B41A9FF830091C0035FD6
+ - sectname: __unwind_info
+ segname: __TEXT
+ addr: 0x100003FB0
+ size: 80
+ offset: 0x3FB0
+ align: 2
+ reloff: 0x0
+ nreloc: 0
+ flags: 0x0
+ reserved1: 0x0
+ reserved2: 0x0
+ reserved3: 0x0
+ content: 010000001C000000000000001C000000000000001C00000002000000643F00003400000034000000B13F00000000000034000000030000000C0002001400020000000001180000000000000400000002
+ - cmd: LC_SEGMENT_64
+ cmdsize: 72
+ segname: __LINKEDIT
+ vmaddr: 4294983680
+ vmsize: 16384
+ fileoff: 16384
+ filesize: 994
+ maxprot: 1
+ initprot: 1
+ nsects: 0
+ flags: 0
+ - cmd: LC_DYLD_CHAINED_FIXUPS
+ cmdsize: 16
+ dataoff: 16384
+ datasize: 56
+ - cmd: LC_DYLD_EXPORTS_TRIE
+ cmdsize: 16
+ dataoff: 16440
+ datasize: 80
+ - cmd: LC_SYMTAB
+ cmdsize: 24
+ symoff: 16528
+ nsyms: 25
+ stroff: 16928
+ strsize: 176
+ - cmd: LC_DYSYMTAB
+ cmdsize: 80
+ ilocalsym: 0
+ nlocalsym: 20
+ iextdefsym: 20
+ nextdefsym: 5
+ iundefsym: 25
+ nundefsym: 0
+ tocoff: 0
+ ntoc: 0
+ modtaboff: 0
+ nmodtab: 0
+ extrefsymoff: 0
+ nextrefsyms: 0
+ indirectsymoff: 0
+ nindirectsyms: 0
+ extreloff: 0
+ nextrel: 0
+ locreloff: 0
+ nlocrel: 0
+ - cmd: LC_LOAD_DYLINKER
+ cmdsize: 32
+ name: 12
+ Content: '/usr/lib/dyld'
+ ZeroPadBytes: 7
+ - cmd: LC_UUID
+ cmdsize: 24
+ uuid: 3E94866E-0D1A-39BD-975B-64E8F1FDBAAE
+ - cmd: LC_BUILD_VERSION
+ cmdsize: 32
+ platform: 1
+ minos: 786432
+ sdk: 787200
+ ntools: 1
+ Tools:
+ - tool: 3
+ version: 49938432
+ - cmd: LC_SOURCE_VERSION
+ cmdsize: 16
+ version: 0
+ - cmd: LC_MAIN
+ cmdsize: 24
+ entryoff: 16252
+ stacksize: 0
+ - cmd: LC_LOAD_DYLIB
+ cmdsize: 56
+ dylib:
+ name: 24
+ timestamp: 2
+ current_version: 85943299
+ compatibility_version: 65536
+ Content: '/usr/lib/libSystem.B.dylib'
+ ZeroPadBytes: 6
+ - cmd: LC_FUNCTION_STARTS
+ cmdsize: 16
+ dataoff: 16520
+ datasize: 8
+ - cmd: LC_DATA_IN_CODE
+ cmdsize: 16
+ dataoff: 16528
+ datasize: 0
+ - cmd: LC_CODE_SIGNATURE
+ cmdsize: 16
+ dataoff: 17104
+ datasize: 274
+LinkEditData:
+ NameList:
+ - n_strx: 43
+ n_type: 0x64
+ n_sect: 0
+ n_desc: 0
+ n_value: 0
+ - n_strx: 91
+ n_type: 0x64
+ n_sect: 0
+ n_desc: 0
+ n_value: 0
+ - n_strx: 98
+ n_type: 0x66
+ n_sect: 0
+ n_desc: 1
+ n_value: 1651098491
+ - n_strx: 1
+ n_type: 0x2E
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983524
+ - n_strx: 152
+ n_type: 0x24
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983524
+ - n_strx: 1
+ n_type: 0x24
+ n_sect: 0
+ n_desc: 0
+ n_value: 8
+ - n_strx: 1
+ n_type: 0x4E
+ n_sect: 1
+ n_desc: 0
+ n_value: 8
+ - n_strx: 1
+ n_type: 0x2E
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983532
+ - n_strx: 157
+ n_type: 0x24
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983532
+ - n_strx: 1
+ n_type: 0x24
+ n_sect: 0
+ n_desc: 0
+ n_value: 8
+ - n_strx: 1
+ n_type: 0x4E
+ n_sect: 1
+ n_desc: 0
+ n_value: 8
+ - n_strx: 1
+ n_type: 0x2E
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983540
+ - n_strx: 162
+ n_type: 0x24
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983540
+ - n_strx: 1
+ n_type: 0x24
+ n_sect: 0
+ n_desc: 0
+ n_value: 8
+ - n_strx: 1
+ n_type: 0x4E
+ n_sect: 1
+ n_desc: 0
+ n_value: 8
+ - n_strx: 1
+ n_type: 0x2E
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983548
+ - n_strx: 167
+ n_type: 0x24
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983548
+ - n_strx: 1
+ n_type: 0x24
+ n_sect: 0
+ n_desc: 0
+ n_value: 52
+ - n_strx: 1
+ n_type: 0x4E
+ n_sect: 1
+ n_desc: 0
+ n_value: 52
+ - n_strx: 1
+ n_type: 0x64
+ n_sect: 1
+ n_desc: 0
+ n_value: 0
+ - n_strx: 2
+ n_type: 0xF
+ n_sect: 1
+ n_desc: 16
+ n_value: 4294967296
+ - n_strx: 22
+ n_type: 0xF
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983532
+ - n_strx: 27
+ n_type: 0xF
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983540
+ - n_strx: 32
+ n_type: 0xF
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983524
+ - n_strx: 37
+ n_type: 0xF
+ n_sect: 1
+ n_desc: 0
+ n_value: 4294983548
+ StringTable:
+ - ' '
+ - __mh_execute_header
+ - _bar
+ - _baz
+ - _foo
+ - _main
+ - '/Users/gclayton/Documents/objfiles/index-names/'
+ - main.c
+ - '/Users/gclayton/Documents/objfiles/index-names/main.o'
+ - _foo
+ - _bar
+ - _baz
+ - _main
+ - ''
+ - ''
+ - ''
+ FunctionStarts: [ 0x3F64, 0x3F6C, 0x3F74, 0x3F7C ]
+...
+)");
+ // This data was taken from a hex dump of the object file from the above yaml
+ // and hexdumped so we can load the cache data in this test.
+ const uint8_t symtab_cache_bytes[] = {
+ 0x01, 0x10, 0x3e, 0x94, 0x86, 0x6e, 0x0d, 0x1a,
+ 0x39, 0xbd, 0x97, 0x5b, 0x64, 0xe8, 0xf1, 0xfd,
+ 0xba, 0xae, 0xff, 0x53, 0x54, 0x41, 0x42, 0x91,
+ 0x00, 0x00, 0x00, 0x00, 0x2f, 0x55, 0x73, 0x65,
+ 0x72, 0x73, 0x2f, 0x67, 0x63, 0x6c, 0x61, 0x79,
+ 0x74, 0x6f, 0x6e, 0x2f, 0x44, 0x6f, 0x63, 0x75,
+ 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x2f, 0x6f, 0x62,
+ 0x6a, 0x66, 0x69, 0x6c, 0x65, 0x73, 0x2f, 0x69,
+ 0x6e, 0x64, 0x65, 0x78, 0x2d, 0x6e, 0x61, 0x6d,
+ 0x65, 0x73, 0x2f, 0x6d, 0x61, 0x69, 0x6e, 0x2e,
+ 0x63, 0x00, 0x2f, 0x55, 0x73, 0x65, 0x72, 0x73,
+ 0x2f, 0x67, 0x63, 0x6c, 0x61, 0x79, 0x74, 0x6f,
+ 0x6e, 0x2f, 0x44, 0x6f, 0x63, 0x75, 0x6d, 0x65,
+ 0x6e, 0x74, 0x73, 0x2f, 0x6f, 0x62, 0x6a, 0x66,
+ 0x69, 0x6c, 0x65, 0x73, 0x2f, 0x69, 0x6e, 0x64,
+ 0x65, 0x78, 0x2d, 0x6e, 0x61, 0x6d, 0x65, 0x73,
+ 0x2f, 0x6d, 0x61, 0x69, 0x6e, 0x2e, 0x6f, 0x00,
+ 0x66, 0x6f, 0x6f, 0x00, 0x62, 0x61, 0x72, 0x00,
+ 0x62, 0x61, 0x7a, 0x00, 0x6d, 0x61, 0x69, 0x6e,
+ 0x00, 0x5f, 0x6d, 0x68, 0x5f, 0x65, 0x78, 0x65,
+ 0x63, 0x75, 0x74, 0x65, 0x5f, 0x68, 0x65, 0x61,
+ 0x64, 0x65, 0x72, 0x00, 0x53, 0x59, 0x4d, 0x42,
+ 0x01, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x2a,
+ 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x64, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x0a, 0x20, 0x01, 0x37, 0x00, 0x00, 0x00, 0x00,
+ 0x7b, 0xc3, 0x69, 0x62, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x01, 0x00, 0x66, 0x00, 0x04, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x02, 0x32, 0x01, 0x6d, 0x00, 0x00,
+ 0x00, 0x01, 0x64, 0x3f, 0x00, 0x00, 0x01, 0x00,
+ 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x08, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x02, 0x32, 0x01, 0x71,
+ 0x00, 0x00, 0x00, 0x01, 0x6c, 0x3f, 0x00, 0x00,
+ 0x01, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x00,
+ 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x32,
+ 0x01, 0x75, 0x00, 0x00, 0x00, 0x01, 0x74, 0x3f,
+ 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x08, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x0f, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x02, 0x32, 0x01, 0x79, 0x00, 0x00, 0x00, 0x01,
+ 0x7c, 0x3f, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+ 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x0f, 0x00, 0x14, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x04, 0x12, 0x02, 0x7e, 0x00, 0x00,
+ 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
+ 0x00, 0x00, 0x64, 0x3f, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x10, 0x00, 0x0f, 0x00, 0x01, 0x00,
+ 0x43, 0x4d, 0x41, 0x50, 0x07, 0x00, 0x00, 0x00,
+ 0x6d, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
+ 0x75, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
+ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x79, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00,
+ 0x37, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+ 0x71, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
+ 0x7e, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00
+ };
+
+ ASSERT_THAT_EXPECTED(ExpectedFile, llvm::Succeeded());
+ auto module_sp = std::make_shared<Module>(ExpectedFile->moduleSpec());
+ ObjectFile *objfile = module_sp->GetObjectFile();
+ ASSERT_NE(objfile, nullptr);
+
+ // Test encoding and decoding an empty symbol table.
+ DataExtractor data(symtab_cache_bytes, sizeof(symtab_cache_bytes),
+ eByteOrderLittle, 8);
+ Symtab symtab(objfile);
+ offset_t data_offset = 0;
+ bool uuid_mismatch = false; // Gets set to true if signature doesn't match.
+ const bool success = symtab.Decode(data, &data_offset, uuid_mismatch);
+ ASSERT_EQ(success, true);
+ ASSERT_EQ(uuid_mismatch, false);
+
+ // Now make sure that name lookup works for all symbols. This indicates that
+ // the Symtab::NameToIndexMap was decoded correctly and works as expected.
+ Symbol *symbol = nullptr;
+ symbol = symtab.FindFirstSymbolWithNameAndType(ConstString("main"),
+ eSymbolTypeCode,
+ Symtab::eDebugAny,
+ Symtab::eVisibilityAny);
+ ASSERT_NE(symbol, nullptr);
+ symbol = symtab.FindFirstSymbolWithNameAndType(ConstString("foo"),
+ eSymbolTypeCode,
+ Symtab::eDebugAny,
+ Symtab::eVisibilityAny);
+ ASSERT_NE(symbol, nullptr);
+ symbol = symtab.FindFirstSymbolWithNameAndType(ConstString("bar"),
+ eSymbolTypeCode,
+ Symtab::eDebugAny,
+ Symtab::eVisibilityAny);
+ ASSERT_NE(symbol, nullptr);
+ symbol = symtab.FindFirstSymbolWithNameAndType(ConstString("baz"),
+ eSymbolTypeCode,
+ Symtab::eDebugAny,
+ Symtab::eVisibilityAny);
+ ASSERT_NE(symbol, nullptr);
+}
Index: lldb/source/Symbol/Symtab.cpp
===================================================================
--- lldb/source/Symbol/Symtab.cpp
+++ lldb/source/Symbol/Symtab.cpp
@@ -1204,6 +1204,7 @@
if (identifier != kIdentifierCStrMap)
return false;
const uint32_t count = data.GetU32(offset_ptr);
+ cstr_map.Reserve(count);
for (uint32_t i=0; i<count; ++i)
{
llvm::StringRef str(strtab.Get(data.GetU32(offset_ptr)));
@@ -1213,6 +1214,16 @@
return false;
cstr_map.Append(ConstString(str), value);
}
+ // We must sort the UniqueCStringMap after decoding it since it is a vector
+ // of UniqueCStringMap::Entry objects which contain a ConstString and type T.
+ // ConstString objects are sorted by "const char *" and then type T and
+ // the "const char *" are point values that will depend on the order in which
+ // ConstString objects are created and in which of the 256 string pools they
+ // are created in. So after we decode all of the entries, we must sort the
+ // name map to ensure name lookups succeed. If we encode and decode within
+ // the same process we wouldn't need to sort, so unit testing didn't catch
+ // this issue when first checked in.
+ cstr_map.Sort();
return true;
}
Index: lldb/source/Plugins/SymbolFile/DWARF/NameToDIE.cpp
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/NameToDIE.cpp
+++ lldb/source/Plugins/SymbolFile/DWARF/NameToDIE.cpp
@@ -100,6 +100,7 @@
if (identifier != kIdentifierNameToDIE)
return false;
const uint32_t count = data.GetU32(offset_ptr);
+ m_map.Reserve(count);
for (uint32_t i = 0; i < count; ++i) {
llvm::StringRef str(strtab.Get(data.GetU32(offset_ptr)));
// No empty strings allowed in the name to DIE maps.
@@ -110,6 +111,16 @@
else
return false;
}
+ // We must sort the UniqueCStringMap after decoding it since it is a vector
+ // of UniqueCStringMap::Entry objects which contain a ConstString and type T.
+ // ConstString objects are sorted by "const char *" and then type T and
+ // the "const char *" are point values that will depend on the order in which
+ // ConstString objects are created and in which of the 256 string pools they
+ // are created in. So after we decode all of the entries, we must sort the
+ // name map to ensure name lookups succeed. If we encode and decode within
+ // the same process we wouldn't need to sort, so unit testing didn't catch
+ // this issue when first checked in.
+ m_map.Sort(std::less<DIERef>());
return true;
}
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