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//===-- Simple malloc and free for use with integration tests -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <stddef.h>
#include <stdint.h>
// Integration tests rely on the following memory functions. This is because the
// compiler code generation can emit calls to them. We want to map the external
// entrypoint to the internal implementation of the function used for testing.
// This is done manually as not all targets support aliases.
namespace LIBC_NAMESPACE {
int bcmp(const void *lhs, const void *rhs, size_t count);
void bzero(void *ptr, size_t count);
int memcmp(const void *lhs, const void *rhs, size_t count);
void *memcpy(void *__restrict, const void *__restrict, size_t);
void *memmove(void *dst, const void *src, size_t count);
void *memset(void *ptr, int value, size_t count);
int atexit(void (*func)(void));
} // namespace LIBC_NAMESPACE
extern "C" {
int bcmp(const void *lhs, const void *rhs, size_t count) {
return LIBC_NAMESPACE::bcmp(lhs, rhs, count);
}
void bzero(void *ptr, size_t count) { LIBC_NAMESPACE::bzero(ptr, count); }
int memcmp(const void *lhs, const void *rhs, size_t count) {
return LIBC_NAMESPACE::memcmp(lhs, rhs, count);
}
void *memcpy(void *__restrict dst, const void *__restrict src, size_t count) {
return LIBC_NAMESPACE::memcpy(dst, src, count);
}
void *memmove(void *dst, const void *src, size_t count) {
return LIBC_NAMESPACE::memmove(dst, src, count);
}
void *memset(void *ptr, int value, size_t count) {
return LIBC_NAMESPACE::memset(ptr, value, count);
}
// This is needed if the test was compiled with '-fno-use-cxa-atexit'.
int atexit(void (*func)(void)) { return LIBC_NAMESPACE::atexit(func); }
} // extern "C"
// Integration tests cannot use the SCUDO standalone allocator as SCUDO pulls
// various other parts of the libc. Since SCUDO development does not use
// LLVM libc build rules, it is very hard to keep track or pull all that SCUDO
// requires. Hence, as a work around for this problem, we use a simple allocator
// which just hands out continuous blocks from a statically allocated chunk of
// memory.
static constexpr uint64_t MEMORY_SIZE = 16384;
static uint8_t memory[MEMORY_SIZE];
static uint8_t *ptr = memory;
extern "C" {
void *malloc(size_t s) {
void *mem = ptr;
ptr += s;
return static_cast<uint64_t>(ptr - memory) >= MEMORY_SIZE ? nullptr : mem;
}
void free(void *) {}
void *realloc(void *ptr, size_t s) {
free(ptr);
return malloc(s);
}
// Integration tests are linked with -nostdlib. BFD linker expects
// __dso_handle when -nostdlib is used.
void *__dso_handle = nullptr;
// On some platform (aarch64 fedora tested) full build integration test
// objects need to link against libgcc, which may expect a __getauxval
// function. For now, it is fine to provide a weak definition that always
// returns false.
[[gnu::weak]] bool __getauxval(uint64_t, uint64_t *) { return false; }
} // extern "C"
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