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5e6c8b18ba
On ELF platforms we currently output an ELF note but with totally invalid contents. I tried experimenting to see whether it was possible to do it properly and tie the result into ReflectionContext, but it turns out to be a hard problem because of issues to do with cross-segment symbol references and relocations. The upshot is that I think for now it's best just to remove it. We might revisit this in future at some point; it would be good to be able to reliably find the Swift metadata just from the ELF Phdrs. rdar://101749382
86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
//===--- SwiftRT-ELF.cpp --------------------------------------------------===//
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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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#include "ImageInspectionCommon.h"
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#include "swift/shims/MetadataSections.h"
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#include <cstddef>
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#include <new>
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extern "C" const char __dso_handle[];
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// Create empty sections to ensure that the start/stop symbols are synthesized
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// by the linker. Otherwise, we may end up with undefined symbol references as
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// the linker table section was never constructed.
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#define DECLARE_SWIFT_SECTION(name) \
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__asm__("\t.section " #name ",\"a\"\n"); \
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__attribute__((__visibility__("hidden"),__aligned__(1))) extern const char __start_##name; \
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__attribute__((__visibility__("hidden"),__aligned__(1))) extern const char __stop_##name;
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extern "C" {
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DECLARE_SWIFT_SECTION(swift5_protocols)
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DECLARE_SWIFT_SECTION(swift5_protocol_conformances)
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DECLARE_SWIFT_SECTION(swift5_type_metadata)
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DECLARE_SWIFT_SECTION(swift5_typeref)
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DECLARE_SWIFT_SECTION(swift5_reflstr)
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DECLARE_SWIFT_SECTION(swift5_fieldmd)
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DECLARE_SWIFT_SECTION(swift5_assocty)
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DECLARE_SWIFT_SECTION(swift5_replace)
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DECLARE_SWIFT_SECTION(swift5_replac2)
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DECLARE_SWIFT_SECTION(swift5_builtin)
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DECLARE_SWIFT_SECTION(swift5_capture)
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DECLARE_SWIFT_SECTION(swift5_mpenum)
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DECLARE_SWIFT_SECTION(swift5_accessible_functions)
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}
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#undef DECLARE_SWIFT_SECTION
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namespace {
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static swift::MetadataSections sections{};
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}
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__attribute__((__constructor__))
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static void swift_image_constructor() {
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#define SWIFT_SECTION_RANGE(name) \
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{ reinterpret_cast<uintptr_t>(&__start_##name), \
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static_cast<uintptr_t>(&__stop_##name - &__start_##name) }
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::new (§ions) swift::MetadataSections {
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swift::CurrentSectionMetadataVersion,
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{ __dso_handle },
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nullptr,
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nullptr,
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SWIFT_SECTION_RANGE(swift5_protocols),
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SWIFT_SECTION_RANGE(swift5_protocol_conformances),
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SWIFT_SECTION_RANGE(swift5_type_metadata),
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SWIFT_SECTION_RANGE(swift5_typeref),
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SWIFT_SECTION_RANGE(swift5_reflstr),
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SWIFT_SECTION_RANGE(swift5_fieldmd),
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SWIFT_SECTION_RANGE(swift5_assocty),
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SWIFT_SECTION_RANGE(swift5_replace),
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SWIFT_SECTION_RANGE(swift5_replac2),
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SWIFT_SECTION_RANGE(swift5_builtin),
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SWIFT_SECTION_RANGE(swift5_capture),
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SWIFT_SECTION_RANGE(swift5_mpenum),
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SWIFT_SECTION_RANGE(swift5_accessible_functions),
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};
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#undef SWIFT_SECTION_RANGE
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swift_addNewDSOImage(§ions);
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}
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