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94ffb3404b
The C compiler on some platforms (such as s390x) assumes that the data pointed to by symbols meets certain alignment requirements. The swift sections do not necessarily meet these alignment requirements so this change adds alignment attributes to them to force the compiler to emit the instruction sequences and relocations required to address unaligned data. This fixes a 'R_390_PC32DBL target misaligned' warning issued by gold on s390x.
71 lines
2.3 KiB
C++
71 lines
2.3 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 "ImageInspectionELF.h"
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#include <cstddef>
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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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}
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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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sections = {
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swift::CurrentSectionMetadataVersion,
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0,
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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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};
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#undef SWIFT_SECTION_RANGE
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swift_addNewDSOImage(§ions);
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}
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