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//===------ State.cpp - OpenMP State & ICV interface ------------- C++ -*-===//
//
// 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 "Shared/Environment.h"
#include "Allocator.h"
#include "Configuration.h"
#include "DeviceTypes.h"
#include "DeviceUtils.h"
#include "Mapping.h"
#include "Synchronization.h"
using namespace ompx;
using namespace allocator;
// Provide a default implementation of malloc / free for AMDGPU platforms built
// without 'libc' support.
extern "C" {
#if (defined(__AMDGPU__) || defined(__SPIRV__)) && !defined(OMPTARGET_HAS_LIBC)
[[gnu::weak]] void *malloc(size_t Size) { return allocator::alloc(Size); }
[[gnu::weak]] void free(void *Ptr) { allocator::free(Ptr); }
#else
[[gnu::leaf]] void *malloc(size_t Size);
[[gnu::leaf]] void free(void *Ptr);
#endif
}
static constexpr uint64_t MEMORY_SIZE = /* 1 MiB */ 1024 * 1024;
alignas(ALIGNMENT) static uint8_t Memory[MEMORY_SIZE] = {0};
// Fallback bump pointer interface for platforms without a functioning
// allocator.
struct BumpAllocatorTy final {
uint64_t Offset = 0;
void *alloc(uint64_t Size) {
Size = utils::roundUp(Size, uint64_t(allocator::ALIGNMENT));
uint64_t OldData = atomic::add(&Offset, Size, atomic::seq_cst);
if (OldData + Size >= MEMORY_SIZE)
__builtin_trap();
return &Memory[OldData];
}
void free(void *) {}
};
BumpAllocatorTy BumpAllocator;
/// allocator namespace implementation
///
///{
void *allocator::alloc(uint64_t Size) {
#if defined(__AMDGPU__) && !defined(OMPTARGET_HAS_LIBC)
return BumpAllocator.alloc(Size);
#else
return ::malloc(Size);
#endif
}
void allocator::free(void *Ptr) {
#if defined(__AMDGPU__) && !defined(OMPTARGET_HAS_LIBC)
BumpAllocator.free(Ptr);
#else
::free(Ptr);
#endif
}
///}
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