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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.
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
//===--- ImageInspectionMachO.cpp - Mach-O 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 dyld on Mach-O-based
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/// platforms to extract runtime metadata embedded in images generated by the
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/// Swift compiler.
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///
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//===----------------------------------------------------------------------===//
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#if defined(__APPLE__) && defined(__MACH__)
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#include "ImageInspection.h"
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#include <mach-o/dyld.h>
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#include <mach-o/getsect.h>
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#include <assert.h>
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#include <dlfcn.h>
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using namespace swift;
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namespace {
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/// The Mach-O section name for the section containing protocol descriptor
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/// references. This lives within SEG_TEXT.
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constexpr const char ProtocolsSection[] = "__swift5_protos";
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/// The Mach-O section name for the section containing protocol conformances.
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/// This lives within SEG_TEXT.
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constexpr const char ProtocolConformancesSection[] = "__swift5_proto";
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/// The Mach-O section name for the section containing type references.
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/// This lives within SEG_TEXT.
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constexpr const char TypeMetadataRecordSection[] = "__swift5_types";
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template<const char *SECTION_NAME,
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void CONSUME_BLOCK(const void *start, uintptr_t size)>
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void addImageCallback(const mach_header *mh, intptr_t vmaddr_slide) {
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#if __POINTER_WIDTH__ == 64
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using mach_header_platform = mach_header_64;
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assert(mh->magic == MH_MAGIC_64 && "loaded non-64-bit image?!");
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#else
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using mach_header_platform = mach_header;
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#endif
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// Look for a __swift5_proto section.
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unsigned long size;
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const uint8_t *section =
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getsectiondata(reinterpret_cast<const mach_header_platform *>(mh),
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SEG_TEXT, SECTION_NAME,
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&size);
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if (!section)
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return;
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CONSUME_BLOCK(section, size);
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}
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} // end anonymous namespace
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void swift::initializeProtocolLookup() {
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_dyld_register_func_for_add_image(
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addImageCallback<ProtocolsSection,
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addImageProtocolsBlockCallback>);
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}
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void swift::initializeProtocolConformanceLookup() {
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_dyld_register_func_for_add_image(
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addImageCallback<ProtocolConformancesSection,
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addImageProtocolConformanceBlockCallback>);
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}
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void swift::initializeTypeMetadataRecordLookup() {
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_dyld_register_func_for_add_image(
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addImageCallback<TypeMetadataRecordSection,
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addImageTypeMetadataRecordBlockCallback>);
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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(__APPLE__) && defined(__MACH__)
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