bb41fc682e
Adds symbol tables to the JITDylibState struct in the ORC runtime MachOPlatformRuntimeState class. This table will hold the addresses of materialized symbols (registered by a new JITLink pass in MachOPlatform), allowing these to be looked up in the executor without an IPC request to the controller. The old lookup-symbols callback (made by the runtime in response to dlsym lookups) is replaced with a push-symbols callback that can trigger materialization of requested symbols. Holding a symbol table on the executor side should make repeat calls to dlsym (and other symbol lookup operations) cheaper since the IPC to trigger materialization happens at most once per symbol. It should also enable us (at some point in the future) to symbolicate backtraces in JIT'd code even if the controller process is gone (e.g. detached or crashed). The trade-off for this is increased memory consumption in the executor and larger JIT'd data transfers (since symbol names are now transferred to the executor unconditionally, even though they may never be used).
110 lines
4.4 KiB
C++
110 lines
4.4 KiB
C++
//===---------- ObjectFormats.cpp - Object format details for ORC ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// ORC-specific object format details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ExecutionEngine/Orc/Shared/ObjectFormats.h"
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namespace llvm {
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namespace orc {
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StringRef MachODataCommonSectionName = "__DATA,__common";
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StringRef MachODataDataSectionName = "__DATA,__data";
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StringRef MachOEHFrameSectionName = "__TEXT,__eh_frame";
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StringRef MachOCompactUnwindInfoSectionName = "__TEXT,__unwind_info";
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StringRef MachOCStringSectionName = "__TEXT,__cstring";
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StringRef MachOModInitFuncSectionName = "__DATA,__mod_init_func";
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StringRef MachOObjCCatListSectionName = "__DATA,__objc_catlist";
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StringRef MachOObjCCatList2SectionName = "__DATA,__objc_catlist2";
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StringRef MachOObjCClassListSectionName = "__DATA,__objc_classlist";
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StringRef MachOObjCClassNameSectionName = "__TEXT,__objc_classname";
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StringRef MachOObjCClassRefsSectionName = "__DATA,__objc_classrefs";
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StringRef MachOObjCConstSectionName = "__DATA,__objc_const";
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StringRef MachOObjCDataSectionName = "__DATA,__objc_data";
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StringRef MachOObjCImageInfoSectionName = "__DATA,__objc_imageinfo";
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StringRef MachOObjCMethNameSectionName = "__TEXT,__objc_methname";
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StringRef MachOObjCMethTypeSectionName = "__TEXT,__objc_methtype";
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StringRef MachOObjCNLCatListSectionName = "__DATA,__objc_nlcatlist";
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StringRef MachOObjCSelRefsSectionName = "__DATA,__objc_selrefs";
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StringRef MachOSwift5ProtoSectionName = "__TEXT,__swift5_proto";
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StringRef MachOSwift5ProtosSectionName = "__TEXT,__swift5_protos";
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StringRef MachOSwift5TypesSectionName = "__TEXT,__swift5_types";
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StringRef MachOSwift5TypeRefSectionName = "__TEXT,__swift5_typeref";
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StringRef MachOSwift5FieldMetadataSectionName = "__TEXT,__swift5_fieldmd";
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StringRef MachOSwift5EntrySectionName = "__TEXT,__swift5_entry";
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StringRef MachOThreadBSSSectionName = "__DATA,__thread_bss";
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StringRef MachOThreadDataSectionName = "__DATA,__thread_data";
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StringRef MachOThreadVarsSectionName = "__DATA,__thread_vars";
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StringRef MachOInitSectionNames[19] = {
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MachOModInitFuncSectionName, MachOObjCCatListSectionName,
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MachOObjCCatList2SectionName, MachOObjCClassListSectionName,
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MachOObjCClassNameSectionName, MachOObjCClassRefsSectionName,
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MachOObjCConstSectionName, MachOObjCDataSectionName,
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MachOObjCImageInfoSectionName, MachOObjCMethNameSectionName,
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MachOObjCMethTypeSectionName, MachOObjCNLCatListSectionName,
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MachOObjCSelRefsSectionName, MachOSwift5ProtoSectionName,
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MachOSwift5ProtosSectionName, MachOSwift5TypesSectionName,
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MachOSwift5TypeRefSectionName, MachOSwift5FieldMetadataSectionName,
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MachOSwift5EntrySectionName,
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};
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StringRef ELFEHFrameSectionName = ".eh_frame";
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StringRef ELFInitArrayFuncSectionName = ".init_array";
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StringRef ELFInitFuncSectionName = ".init";
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StringRef ELFFiniArrayFuncSectionName = ".fini_array";
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StringRef ELFFiniFuncSectionName = ".fini";
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StringRef ELFCtorArrayFuncSectionName = ".ctors";
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StringRef ELFDtorArrayFuncSectionName = ".dtors";
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StringRef ELFInitSectionNames[3]{
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ELFInitArrayFuncSectionName,
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ELFInitFuncSectionName,
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ELFCtorArrayFuncSectionName,
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};
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StringRef ELFThreadBSSSectionName = ".tbss";
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StringRef ELFThreadDataSectionName = ".tdata";
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bool isMachOInitializerSection(StringRef SegName, StringRef SecName) {
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for (auto &InitSection : MachOInitSectionNames) {
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// Loop below assumes all MachO init sectios have a length-6
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// segment name.
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assert(InitSection[6] == ',' && "Init section seg name has length != 6");
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if (InitSection.starts_with(SegName) && InitSection.substr(7) == SecName)
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return true;
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}
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return false;
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}
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bool isMachOInitializerSection(StringRef QualifiedName) {
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for (auto &InitSection : MachOInitSectionNames)
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if (InitSection == QualifiedName)
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return true;
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return false;
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}
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bool isELFInitializerSection(StringRef SecName) {
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for (StringRef InitSection : ELFInitSectionNames) {
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StringRef Name = SecName;
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if (Name.consume_front(InitSection) && (Name.empty() || Name[0] == '.'))
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return true;
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}
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return false;
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}
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bool isCOFFInitializerSection(StringRef SecName) {
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return SecName.startswith(".CRT");
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}
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} // namespace orc
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} // namespace llvm
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