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//-----------------------------------------------------------------------------
// Name: stack_allocator.cpp
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#include "stack_allocator.h"
#include <Utility/assert.h>
#include <Utility/stacktrace.h>
#include <Logging/logdata.h>
#include <Threading/thread_sanity.h>
#include <Memory/allocation.h>
#ifndef NO_ERR
#include <Internal/error.h>
#endif
#include <cstdio>
#include <cstdlib>
#include <stdint.h>
using std::endl;
void* StackAllocator::Alloc(size_t requested_size) {
current_allocation_count++;
frame_allocation_count++;
//AssertMainThread();
#ifdef DEBUG_DISABLE_STACK_ALLOCATOR
return OG_MALLOC(requested_size);
#else // DEBUG_DISABLE_STACK_ALLOCATOR
if(stack_block_pts[stack_blocks] + requested_size < size && stack_blocks < kMaxBlocks-2){
++stack_blocks;
stack_block_pts[stack_blocks] = stack_block_pts[stack_blocks-1] + requested_size;
void* ptr = (void*)((uintptr_t)mem + stack_block_pts[stack_blocks-1]);
return ptr;
} else {
if( stack_block_pts[stack_blocks] + requested_size >= size )
{
LOGF << "Unable to stack allocate memory size:" << requested_size << ". Out of memory." << endl;
}
else
{
LOGF << "Unable to stack allocate memory size:" << requested_size << ". Out of blocks." << endl;
}
LOGF << GenerateStacktrace() << endl;
return NULL;
}
#endif // DEBUG_DISABLE_STACK_ALLOCATOR
}
void StackAllocator::Free(void* ptr) {
current_allocation_count--;
//AssertMainThread();
#ifdef DEBUG_DISABLE_STACK_ALLOCATOR
OG_FREE(ptr);
#else // DEBUG_DISABLE_STACK_ALLOCATOR
if(stack_blocks){
--stack_blocks;
LOG_ASSERT(ptr == (void*)((uintptr_t)mem + stack_block_pts[stack_blocks]));
if( ptr != (void*)((uintptr_t)mem + stack_block_pts[stack_blocks]) )
{
LOGE << "Called fre on something that isn't at the top of the stack" << endl;
LOGE << "Stacktrace:" << endl << GenerateStacktrace() << endl;
}
} else {
#ifndef NO_ERR
FatalError("Memory stack underflow", "Calling Free() on StackMemoryBlock with no stack elements");
#endif
}
#endif // DEBUG_DISABLE_STACK_ALLOCATOR
}
uintptr_t StackAllocator::TopBlockSize() {
switch(stack_blocks){
case 0:
return 0;
default:
return stack_block_pts[stack_blocks] - stack_block_pts[stack_blocks-1];
}
}
void StackAllocator::Init(void* p_mem, size_t p_size) {
for (int i = 0; i < kMaxBlocks; i++) {
stack_block_pts[i] = 0;
}
mem = p_mem;
size = p_size;
stack_blocks = 0;
}
void StackAllocator::Dispose() {
for (int i = 0; i < kMaxBlocks; i++) {
stack_block_pts[i] = 0;
}
mem = 0;
size = 0;
stack_blocks = 0;
}
uint64_t StackAllocator::AllocatedAmountMemory() {
return stack_block_pts[stack_blocks];
}
uint32_t StackAllocator::GetCurrentAllocations() {
return current_allocation_count;
}
uint32_t StackAllocator::GetAndResetAllocationCount() {
uint32_t v = frame_allocation_count;
frame_allocation_count = 0;
return v;
}
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