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a7fef62a44
Search through the new section containing Swift protocol descriptor references to resolve protocols by mangled name. Use this functionality to support protocol composition types within _typeForMangledName.
133 lines
4.3 KiB
C++
133 lines
4.3 KiB
C++
//===--- ImageInspectionELF.cpp - ELF image inspection --------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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///
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/// This file includes routines that interact with ld*.so on ELF-based platforms
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/// to extract runtime metadata embedded in dynamically linked ELF images
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/// generated by the Swift compiler.
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///
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//===----------------------------------------------------------------------===//
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#if defined(__ELF__)
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#include "ImageInspection.h"
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#include "ImageInspectionELF.h"
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#include <dlfcn.h>
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using namespace swift;
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namespace {
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static const swift::MetadataSections *registered = nullptr;
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void record(const swift::MetadataSections *sections) {
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if (registered == nullptr) {
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registered = sections;
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sections->next = sections->prev = sections;
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} else {
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registered->prev->next = sections;
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sections->next = registered;
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sections->prev = registered->prev;
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registered->prev = sections;
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}
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}
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}
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void swift::initializeProtocolLookup() {
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const swift::MetadataSections *sections = registered;
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while (true) {
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const swift::MetadataSections::Range &protocols =
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sections->swift5_protocols;
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if (protocols.length)
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addImageProtocolsBlockCallback(reinterpret_cast<void *>(protocols.start),
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protocols.length);
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if (sections->next == registered)
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break;
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sections = sections->next;
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}
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}
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void swift::initializeProtocolConformanceLookup() {
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const swift::MetadataSections *sections = registered;
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while (true) {
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const swift::MetadataSections::Range &conformances =
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sections->swift5_protocol_conformances;
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if (conformances.length)
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addImageProtocolConformanceBlockCallback(reinterpret_cast<void *>(conformances.start),
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conformances.length);
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if (sections->next == registered)
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break;
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sections = sections->next;
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}
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}
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void swift::initializeTypeMetadataRecordLookup() {
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const swift::MetadataSections *sections = registered;
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while (true) {
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const swift::MetadataSections::Range &type_metadata =
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sections->swift5_type_metadata;
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if (type_metadata.length)
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addImageTypeMetadataRecordBlockCallback(reinterpret_cast<void *>(type_metadata.start),
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type_metadata.length);
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if (sections->next == registered)
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break;
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sections = sections->next;
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}
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}
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// As ELF images are loaded, ImageInspectionInit:sectionDataInit() will call
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// addNewDSOImage() with an address in the image that can later be used via
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// dladdr() to dlopen() the image after the appropriate initialize*Lookup()
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// function has been called.
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SWIFT_RUNTIME_EXPORT
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void swift_addNewDSOImage(const void *addr) {
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const swift::MetadataSections *sections =
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static_cast<const swift::MetadataSections *>(addr);
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record(sections);
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const auto &protocols_section = sections->swift5_protocol_conformances;
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const void *protocols =
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reinterpret_cast<void *>(protocols_section.start);
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if (protocols_section.length)
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addImageProtocolsBlockCallback(protocols, protocols_section.length);
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const auto &protocol_conformances = sections->swift5_protocol_conformances;
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const void *conformances =
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reinterpret_cast<void *>(protocol_conformances.start);
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if (protocol_conformances.length)
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addImageProtocolConformanceBlockCallback(conformances,
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protocol_conformances.length);
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const auto &type_metadata = sections->swift5_type_metadata;
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const void *metadata = reinterpret_cast<void *>(type_metadata.start);
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if (type_metadata.length)
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addImageTypeMetadataRecordBlockCallback(metadata, type_metadata.length);
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}
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int swift::lookupSymbol(const void *address, SymbolInfo *info) {
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Dl_info dlinfo;
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if (dladdr(address, &dlinfo) == 0) {
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return 0;
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}
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info->fileName = dlinfo.dli_fname;
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info->baseAddress = dlinfo.dli_fbase;
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info->symbolName = dlinfo.dli_sname;
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info->symbolAddress = dlinfo.dli_saddr;
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return 1;
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}
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#endif // defined(__ELF__)
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