83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
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//===-- Simple malloc and free for use with integration tests -------------===//
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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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#include <stddef.h>
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#include <stdint.h>
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// Integration tests rely on the following memory functions. This is because the
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// compiler code generation can emit calls to them. We want to map the external
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// entrypoint to the internal implementation of the function used for testing.
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// This is done manually as not all targets support aliases.
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namespace LIBC_NAMESPACE {
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int bcmp(const void *lhs, const void *rhs, size_t count);
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void bzero(void *ptr, size_t count);
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int memcmp(const void *lhs, const void *rhs, size_t count);
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void *memcpy(void *__restrict, const void *__restrict, size_t);
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void *memmove(void *dst, const void *src, size_t count);
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void *memset(void *ptr, int value, size_t count);
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int atexit(void (*func)(void));
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} // namespace LIBC_NAMESPACE
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extern "C" {
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int bcmp(const void *lhs, const void *rhs, size_t count) {
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return LIBC_NAMESPACE::bcmp(lhs, rhs, count);
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}
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void bzero(void *ptr, size_t count) { LIBC_NAMESPACE::bzero(ptr, count); }
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int memcmp(const void *lhs, const void *rhs, size_t count) {
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return LIBC_NAMESPACE::memcmp(lhs, rhs, count);
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}
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void *memcpy(void *__restrict dst, const void *__restrict src, size_t count) {
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return LIBC_NAMESPACE::memcpy(dst, src, count);
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}
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void *memmove(void *dst, const void *src, size_t count) {
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return LIBC_NAMESPACE::memmove(dst, src, count);
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}
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void *memset(void *ptr, int value, size_t count) {
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return LIBC_NAMESPACE::memset(ptr, value, count);
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}
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// This is needed if the test was compiled with '-fno-use-cxa-atexit'.
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int atexit(void (*func)(void)) { return LIBC_NAMESPACE::atexit(func); }
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} // extern "C"
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// Integration tests cannot use the SCUDO standalone allocator as SCUDO pulls
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// various other parts of the libc. Since SCUDO development does not use
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// LLVM libc build rules, it is very hard to keep track or pull all that SCUDO
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// requires. Hence, as a work around for this problem, we use a simple allocator
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// which just hands out continuous blocks from a statically allocated chunk of
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// memory.
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static constexpr uint64_t MEMORY_SIZE = 16384;
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static uint8_t memory[MEMORY_SIZE];
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static uint8_t *ptr = memory;
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extern "C" {
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void *malloc(size_t s) {
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void *mem = ptr;
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ptr += s;
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return static_cast<uint64_t>(ptr - memory) >= MEMORY_SIZE ? nullptr : mem;
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}
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void free(void *) {}
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void *realloc(void *ptr, size_t s) {
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free(ptr);
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return malloc(s);
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}
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// Integration tests are linked with -nostdlib. BFD linker expects
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// __dso_handle when -nostdlib is used.
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void *__dso_handle = nullptr;
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} // extern "C"
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