Date: Sat, 13 Jul 2019 15:04:30 +0000 (UTC) From: Dimitry Andric <dim@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r349971 - head/contrib/llvm/tools/lld/ELF Message-ID: <201907131504.x6DF4UKU031720@repo.freebsd.org>
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Author: dim Date: Sat Jul 13 15:04:30 2019 New Revision: 349971 URL: https://svnweb.freebsd.org/changeset/base/349971 Log: Pull in r365760 from upstream lld trunk (by Fangrui Song): [ELF] Handle non-glob patterns before glob patterns in version scripts & fix a corner case of --dynamic-list This fixes PR38549, which is silently accepted by ld.bfd. This seems correct because it makes sense to let non-glob patterns take precedence over glob patterns. lld issues an error because `assignWildcardVersion(ver, VER_NDX_LOCAL);` is processed before `assignExactVersion(ver, v.id, v.name);`. Move all assignWildcardVersion() calls after assignExactVersion() calls to fix this. Also, move handleDynamicList() to the bottom. computeBinding() called by includeInDynsym() has this cryptic rule: if (versionId == VER_NDX_LOCAL && isDefined() && !isPreemptible) return STB_LOCAL; Before the change: * foo's version is set to VER_NDX_LOCAL due to `local: *` * handleDynamicList() is called - foo.computeBinding() is STB_LOCAL - foo.includeInDynsym() is false - foo.isPreemptible is not set (wrong) * foo's version is set to V1 After the change: * foo's version is set to VER_NDX_LOCAL due to `local: *` * foo's version is set to V1 * handleDynamicList() is called - foo.computeBinding() is STB_GLOBAL - foo.includeInDynsym() is true - foo.isPreemptible is set (correct) Reviewed By: ruiu Differential Revision: https://reviews.llvm.org/D64550 This makes it longer necessary to patch the version scripts for the samba ports, to avoid "duplicate symbol 'pdb_search_init' in version script" errors. PR: 230602 MFC after: 3 days Modified: head/contrib/llvm/tools/lld/ELF/SymbolTable.cpp head/contrib/llvm/tools/lld/ELF/SymbolTable.h Modified: head/contrib/llvm/tools/lld/ELF/SymbolTable.cpp ============================================================================== --- head/contrib/llvm/tools/lld/ELF/SymbolTable.cpp Sat Jul 13 14:42:09 2019 (r349970) +++ head/contrib/llvm/tools/lld/ELF/SymbolTable.cpp Sat Jul 13 15:04:30 2019 (r349971) @@ -654,20 +654,6 @@ std::vector<Symbol *> SymbolTable::findAllByVersion(Sy return Res; } -// If there's only one anonymous version definition in a version -// script file, the script does not actually define any symbol version, -// but just specifies symbols visibilities. -void SymbolTable::handleAnonymousVersion() { - for (SymbolVersion &Ver : Config->VersionScriptGlobals) - assignExactVersion(Ver, VER_NDX_GLOBAL, "global"); - for (SymbolVersion &Ver : Config->VersionScriptGlobals) - assignWildcardVersion(Ver, VER_NDX_GLOBAL); - for (SymbolVersion &Ver : Config->VersionScriptLocals) - assignExactVersion(Ver, VER_NDX_LOCAL, "local"); - for (SymbolVersion &Ver : Config->VersionScriptLocals) - assignWildcardVersion(Ver, VER_NDX_LOCAL); -} - // Handles -dynamic-list. void SymbolTable::handleDynamicList() { for (SymbolVersion &Ver : Config->DynamicList) { @@ -731,23 +717,27 @@ void SymbolTable::assignWildcardVersion(SymbolVersion // This function processes version scripts by updating VersionId // member of symbols. +// If there's only one anonymous version definition in a version +// script file, the script does not actually define any symbol version, +// but just specifies symbols visibilities. void SymbolTable::scanVersionScript() { - // Handle edge cases first. - handleAnonymousVersion(); - handleDynamicList(); - - // Now we have version definitions, so we need to set version ids to symbols. - // Each version definition has a glob pattern, and all symbols that match - // with the pattern get that version. - // First, we assign versions to exact matching symbols, // i.e. version definitions not containing any glob meta-characters. + for (SymbolVersion &Ver : Config->VersionScriptGlobals) + assignExactVersion(Ver, VER_NDX_GLOBAL, "global"); + for (SymbolVersion &Ver : Config->VersionScriptLocals) + assignExactVersion(Ver, VER_NDX_LOCAL, "local"); for (VersionDefinition &V : Config->VersionDefinitions) for (SymbolVersion &Ver : V.Globals) assignExactVersion(Ver, V.Id, V.Name); // Next, we assign versions to fuzzy matching symbols, // i.e. version definitions containing glob meta-characters. + for (SymbolVersion &Ver : Config->VersionScriptGlobals) + assignWildcardVersion(Ver, VER_NDX_GLOBAL); + for (SymbolVersion &Ver : Config->VersionScriptLocals) + assignWildcardVersion(Ver, VER_NDX_LOCAL); + // Note that because the last match takes precedence over previous matches, // we iterate over the definitions in the reverse order. for (VersionDefinition &V : llvm::reverse(Config->VersionDefinitions)) @@ -759,6 +749,12 @@ void SymbolTable::scanVersionScript() { // Let them parse and update their names to exclude version suffix. for (Symbol *Sym : SymVector) Sym->parseSymbolVersion(); + + // isPreemptible is false at this point. To correctly compute the binding of a + // Defined (which is used by includeInDynsym()), we need to know if it is + // VER_NDX_LOCAL or not. If defaultSymbolVersion is VER_NDX_LOCAL, we should + // compute symbol versions before handling --dynamic-list. + handleDynamicList(); } template void SymbolTable::addFile<ELF32LE>(InputFile *); Modified: head/contrib/llvm/tools/lld/ELF/SymbolTable.h ============================================================================== --- head/contrib/llvm/tools/lld/ELF/SymbolTable.h Sat Jul 13 14:42:09 2019 (r349970) +++ head/contrib/llvm/tools/lld/ELF/SymbolTable.h Sat Jul 13 15:04:30 2019 (r349971) @@ -90,7 +90,6 @@ class SymbolTable { (private) std::vector<Symbol *> findAllByVersion(SymbolVersion Ver); llvm::StringMap<std::vector<Symbol *>> &getDemangledSyms(); - void handleAnonymousVersion(); void assignExactVersion(SymbolVersion Ver, uint16_t VersionId, StringRef VersionName); void assignWildcardVersion(SymbolVersion Ver, uint16_t VersionId);
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