derek.holloway
7502bf64a4
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41 lines
1.8 KiB
C++
41 lines
1.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Utilities for locating the address range of a function.
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//
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// On MachO targets the linker synthesises section$start$SEG$sect /
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// section$end$SEG$sect symbols; __asm() is used to bind them to valid C
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// identifiers without the leading '_' implied by the Darwin User Label Prefix.
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//
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// On ELF targets the linker synthesises __start_<section> / __stop_<section>
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// symbols for any section whose name is a valid C identifier.
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// We don't use dladdr() because on musl it's a no-op when statically linked.
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#ifndef LIBUNWIND_TEST_SUPPORT_FUNC_BOUNDS_H
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#define LIBUNWIND_TEST_SUPPORT_FUNC_BOUNDS_H
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#ifdef __APPLE__
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#define FUNC_BOUNDS_DECL(name) \
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extern char name##_start __asm("section$start$__TEXT$__" #name); \
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extern char name##_end __asm("section$end$__TEXT$__" #name)
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#define FUNC_ATTR(name) \
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__attribute__((section("__TEXT,__" #name ",regular,pure_instructions")))
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#define FUNC_START(name) (&name##_start)
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#define FUNC_END(name) (&name##_end)
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#else
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#define FUNC_BOUNDS_DECL(name) \
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extern char __start_##name; \
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extern char __stop_##name
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#define FUNC_ATTR(name) __attribute__((section(#name)))
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#define FUNC_START(name) (&__start_##name)
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#define FUNC_END(name) (&__stop_##name)
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#endif
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#endif // LIBUNWIND_TEST_SUPPORT_FUNC_BOUNDS_H
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