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7036784480
In embedded mode, some things call retain/release using the C++ declarations, but the implementations are in Swift. The Swift implementations don't use preservemost, so the C++ declarations must not declare preservemost in that context. rdar://163940783
103 lines
4.9 KiB
C++
103 lines
4.9 KiB
C++
//===--- CustomRRABI.h - Custom retain/release ABI support ----------------===//
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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) 2022 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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// Utilities for creating register-specific retain/release entrypoints.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_CUSTOMRRABI_H
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#define SWIFT_RUNTIME_CUSTOMRRABI_H
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namespace swift {
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#if __arm64__ || defined(_M_ARM64)
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// Invoke the macro X on the number of each register we support for a custom ABI
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// entrypoint, along with a custom parameter. We don't support all 31 registers:
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// - x0 is already covered by the standard entrypoints.
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// - x16/x17 are scratch registers that can be used by procedure call glue.
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// - x18 is reserved.
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// - x29 is the frame pointer.
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// - x30 is the link register and gets overwritten when making a call.
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#define CUSTOM_RR_ENTRYPOINTS_FOREACH_REG(X, param) \
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X(1, param) \
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X(2, param) \
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X(3, param) \
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X(4, param) \
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X(5, param) \
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X(6, param) \
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X(7, param) \
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X(8, param) \
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X(9, param) \
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X(10, param) \
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X(11, param) \
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X(12, param) \
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X(13, param) \
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X(14, param) \
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X(15, param) \
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X(19, param) \
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X(20, param) \
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X(21, param) \
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X(22, param) \
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X(23, param) \
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X(24, param) \
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X(25, param) \
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X(26, param) \
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X(27, param) \
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X(28, param)
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// Helper template for deducing the parameter type of a one-parameter function.
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template <typename Ret, typename Param>
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Param returnTypeHelper(Ret (*)(Param)) {}
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#if SWIFT_REFCOUNT_CC_PRESERVEMOST
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template <typename Ret, typename Param>
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Param returnTypeHelper(SWIFT_REFCOUNT_CC Ret (*)(Param)) {}
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#endif
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#if defined(__LP64__) || defined(_LP64)
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#define REGISTER_SUBSTITUTION_PREFIX ""
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#define REGISTER_PREFIX "x"
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#else
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#define REGISTER_SUBSTITUTION_PREFIX "w"
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#define REGISTER_PREFIX "w"
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#endif
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// Helper macro that defines one entrypoint that takes the parameter in reg and
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// calls through to function.
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#define CUSTOM_RR_ENTRYPOINTS_DEFINE_ONE_ENTRYPOINT(reg, function) \
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SWIFT_RUNTIME_EXPORT decltype(function(nullptr)) function##_x##reg() { \
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decltype(returnTypeHelper(function)) ptr; \
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asm(".ifnc %" REGISTER_SUBSTITUTION_PREFIX "0, " REGISTER_PREFIX #reg "\n" \
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"mov %" REGISTER_SUBSTITUTION_PREFIX "0, " REGISTER_PREFIX #reg "\n" \
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".endif" \
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: "=r"(ptr)); \
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return function(ptr); \
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}
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// A macro that defines all register-specific entrypoints for the given
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// retain/release function.
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#define CUSTOM_RR_ENTRYPOINTS_DEFINE_ENTRYPOINTS(function) \
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CUSTOM_RR_ENTRYPOINTS_FOREACH_REG( \
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CUSTOM_RR_ENTRYPOINTS_DEFINE_ONE_ENTRYPOINT, function)
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#else
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// No custom entrypoints on other architectures.
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#define CUSTOM_RR_ENTRYPOINTS_DEFINE_ENTRYPOINTS(function)
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#endif
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} // namespace swift
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#endif // SWIFT_RUNTIME_CUSTOMRRABI_H
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