Code cleanup
This commit is contained in:
Victor Olin
parent
7bb64c0489
commit
cdc802476d
6 changed files with 503 additions and 459 deletions
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@ -8,405 +8,444 @@
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#include <vector>
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#include "../include/heap.hpp"
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using namespace std;
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namespace GC {
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using std::cout, std::endl, std::vector, std::hex, std::dec;
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/**
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* Initialises the heap singleton and saves the address
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* of the calling stack frame as the stack_top. Presumeably
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* this address points to the stack frame of the compiled
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* LLVM executable after linking.
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*/
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void Heap::init() {
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Heap *heap = Heap::the();
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heap->m_stack_top = reinterpret_cast<uintptr_t *>(__builtin_frame_address(1));
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}
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namespace GC
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{
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/**
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* Disposes the heap at program exit.
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*/
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void Heap::dispose() {
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Heap *heap = Heap::the();
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delete heap;
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}
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/**
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* Initialises the heap singleton and saves the address
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* of the calling stack frame as the stack_top. Presumeably
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* this address points to the stack frame of the compiled
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* LLVM executable after linking.
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*/
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void Heap::init()
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{
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Heap *heap = Heap::the();
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heap->m_stack_top = static_cast<uintptr_t *>(__builtin_frame_address(1));
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}
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/**
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* Allocates a given amount of bytes on the heap.
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*
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* @param size The amount of bytes to be allocated.
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*
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* @return A pointer to the address where the memory
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* has been allocated. This pointer is supposed
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* to be casted to and object pointer.
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*/
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void *Heap::alloc(size_t size) {
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/**
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* Disposes the heap at program exit.
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*/
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void Heap::dispose()
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{
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Heap *heap = Heap::the();
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delete heap;
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}
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// Singleton
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Heap *heap = Heap::the();
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if (size < 0) {
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cout << "Heap: Cannot alloc less than 0B. No bytes allocated." << endl;
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return nullptr;
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}
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/**
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* Allocates a given amount of bytes on the heap.
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*
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* @param size The amount of bytes to be allocated.
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*
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* @return A pointer to the address where the memory
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* has been allocated. This pointer is supposed
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* to be casted to and object pointer.
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*/
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void *Heap::alloc(size_t size)
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{
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if (heap->m_size + size > HEAP_SIZE) {
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heap->collect();
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// If collect failed, crash with OOM error
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assert(heap->m_size + size <= HEAP_SIZE && "Heap: Out Of Memory");
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}
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// Singleton
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Heap *heap = Heap::the();
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// If a chunk was recycled, return the old chunk address
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uintptr_t *reused_chunk = heap->try_recycle_chunks(size);
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if (reused_chunk != nullptr) {
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return (void *)reused_chunk;
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}
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// If no free chunks was found (reused_chunk is a nullptr),
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// then create a new chunk
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auto new_chunk = new Chunk;
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new_chunk->size = size;
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new_chunk->start = (uintptr_t *)(heap->m_heap + heap->m_size);
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if (size < 0)
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{
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cout << "Heap: Cannot alloc less than 0B. No bytes allocated." << endl;
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return nullptr;
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}
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heap->m_size += size;
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if (heap->m_size + size > HEAP_SIZE)
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{
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heap->collect();
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// If collect failed, crash with OOM error
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assert(heap->m_size + size <= HEAP_SIZE && "Heap: Out Of Memory");
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}
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heap->m_allocated_chunks.push_back(new_chunk);
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// If a chunk was recycled, return the old chunk address
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uintptr_t *reused_chunk = heap->try_recycle_chunks(size);
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if (reused_chunk != nullptr)
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{
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return static_cast<void *>(reused_chunk);
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}
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// new_chunk should probably be a unique pointer, if that isn't implicit already
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return new_chunk->start;
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}
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// If no free chunks was found (reused_chunk is a nullptr),
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// then create a new chunk
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auto new_chunk = new Chunk;
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new_chunk->size = size;
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new_chunk->start = (uintptr_t *)(heap->m_heap + heap->m_size);
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/**
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* Tries to recycle used and freed chunks that are
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* already allocated objects by the OS but freed
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* from our Heap. This reduces the amount of GC
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* objects slightly which saves time from malloc'ing
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* memory from the OS.
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*
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* @param size Amount of bytes needed for the object
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* which is about to be allocated.
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*
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* @returns If a chunk is found and recycled, a
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* pointer to the allocated memory for
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* the object is returned. If not, a
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* nullptr is returned to signify no
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* chunks were found.
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*/
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uintptr_t *Heap::try_recycle_chunks(size_t size) {
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auto heap = Heap::the();
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// Check if there are any freed chunks large enough for current request
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for (size_t i = 0; i < heap->m_freed_chunks.size(); i++) {
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// auto cp = heap->m_freed_chunks.at(i);
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auto cp = getAt(heap->m_freed_chunks, i);
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auto iter = heap->m_freed_chunks.begin();
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advance(iter, i);
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if (cp->size > size)
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{
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// Split the chunk, use one part and add the remaining part to
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// the list of freed chunks
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size_t diff = cp->size - size;
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auto chunk_complement = new Chunk;
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chunk_complement->size = diff;
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chunk_complement->start = cp->start + cp->size;
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heap->m_size += size;
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heap->m_freed_chunks.erase(iter);
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heap->m_freed_chunks.push_back(chunk_complement);
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heap->m_allocated_chunks.push_back(cp);
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return cp->start;
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}
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else if (cp->size == size)
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{
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// Reuse the whole chunk
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heap->m_freed_chunks.erase(iter);
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heap->m_allocated_chunks.push_back(cp);
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return cp->start;
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}
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}
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return nullptr;
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}
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heap->m_allocated_chunks.push_back(new_chunk);
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/**
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* Collection phase of the garbage collector. When
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* an allocation is requested and there is no space
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* left on the heap, a collection is triggered. This
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* function is private so that the user cannot trigger
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* a collection unneccessarily.
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*/
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void Heap::collect() {
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// Get instance
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auto heap = Heap::the();
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// new_chunk should probably be a unique pointer, if that isn't implicit already
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return new_chunk->start;
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}
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// get current stack
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auto stack_bottom = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
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/**
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* Tries to recycle used and freed chunks that are
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* already allocated objects by the OS but freed
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* from our Heap. This reduces the amount of GC
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* objects slightly which saves time from malloc'ing
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* memory from the OS.
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*
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* @param size Amount of bytes needed for the object
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* which is about to be allocated.
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*
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* @returns If a chunk is found and recycled, a
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* pointer to the allocated memory for
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* the object is returned. If not, a
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* nullptr is returned to signify no
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* chunks were found.
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*/
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uintptr_t *Heap::try_recycle_chunks(size_t size)
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{
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auto heap = Heap::the();
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// Check if there are any freed chunks large enough for current request
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for (size_t i = 0; i < heap->m_freed_chunks.size(); i++)
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{
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auto chunk = getAt(heap->m_freed_chunks, i);
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auto iter = heap->m_freed_chunks.begin();
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advance(iter, i);
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if (chunk->size > size)
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{
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// Split the chunk, use one part and add the remaining part to
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// the list of freed chunks
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size_t diff = chunk->size - size;
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uintptr_t *stack_top = heap->m_stack_top != nullptr ? heap->m_stack_top : (uintptr_t *)0;
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auto chunk_complement = new Chunk;
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chunk_complement->size = diff;
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chunk_complement->start = chunk->start + chunk->size;
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auto work_list = heap->m_allocated_chunks;
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mark(stack_bottom, stack_top, work_list);
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heap->m_freed_chunks.erase(iter);
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heap->m_freed_chunks.push_back(chunk_complement);
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heap->m_allocated_chunks.push_back(chunk);
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sweep(heap);
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return chunk->start;
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}
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else if (chunk->size == size)
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{
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// Reuse the whole chunk
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heap->m_freed_chunks.erase(iter);
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heap->m_allocated_chunks.push_back(chunk);
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return chunk->start;
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}
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}
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return nullptr;
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}
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free(heap);
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}
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/**
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* Collection phase of the garbage collector. When
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* an allocation is requested and there is no space
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* left on the heap, a collection is triggered. This
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* function is private so that the user cannot trigger
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* a collection unneccessarily.
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*/
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void Heap::collect()
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{
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// Get instance
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auto heap = Heap::the();
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/**
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* Iterates through the stack, if an element on the stack points to a chunk,
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* called a root chunk, that chunk is marked (i.e. reachable).
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* Then it recursively follows all chunks which are possibly reachable from
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* the root chunk and mark those chunks.
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* If a chunk is marked it is removed from the worklist, since it's no longer of
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* concern for this method.
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*
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* @param start Pointer to the start of the stack frame.
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* @param end Pointer to the end of the stack frame.
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* @param worklist The currently allocated chunks, which haven't been marked.
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*/
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void Heap::mark(uintptr_t *start, const uintptr_t *end, vector<Chunk*> worklist) {
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int counter = 0;
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// To find adresses thats in the worklist
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for (; start < end; start++) {
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counter++;
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auto it = worklist.begin();
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auto stop = worklist.end();
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// for (auto it = worklist.begin(); it != worklist.end();) {
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while (it != stop) {
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Chunk *chunk = *it;
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// get current stack
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auto stack_bottom = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
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auto c_start = reinterpret_cast<uintptr_t>(chunk->start);
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auto c_size = reinterpret_cast<uintptr_t>(chunk->size);
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auto c_end = reinterpret_cast<uintptr_t>(c_start + c_size);
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uintptr_t *stack_top = heap->m_stack_top != nullptr ? heap->m_stack_top : (uintptr_t *)0;
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cout << "Start points to:\t" << hex << *start << endl;
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cout << "Chunk start:\t\t" << hex << c_start << endl;
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cout << "Chunk end:\t\t" << hex << c_end << "\n" << endl;
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auto work_list = heap->m_allocated_chunks;
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mark(stack_bottom, stack_top, work_list);
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// Check if the stack pointer aligns with the chunk
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if (c_start <= *start && *start < c_end) {
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if (!chunk->marked) {
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chunk->marked = true;
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// Remove the marked chunk from the worklist
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it = worklist.erase(it);
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// Recursively call mark, to see if the reachable chunk further points to another chunk
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mark((uintptr_t*) c_start, (uintptr_t*) c_end, worklist);
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}
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else {
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++it;
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}
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}
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else {
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++it;
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}
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}
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}
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cout << "Counter: " << counter << endl;
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}
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/**
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* Sweeps the heap, unmarks the marked chunks for the next cycle,
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* adds the unmarked nodes to the list of freed chunks; to be freed.
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*
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* @param heap Pointer to the heap singleton instance.
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*/
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void Heap::sweep(Heap *heap) {
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auto iter = heap->m_allocated_chunks.begin();
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auto stop = heap->m_allocated_chunks.end();
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// for (auto it = heap->m_allocated_chunks.begin(); it != heap->m_allocated_chunks.end();) {
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while (iter != stop) {
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Chunk *chunk = *iter;
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sweep(heap);
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// Unmark the marked chunks for the next iteration.
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if (chunk->marked) {
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chunk->marked = false;
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++iter;
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}
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else {
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// Add the unmarked chunks to freed chunks and remove from
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// the list of allocated chunks
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heap->m_freed_chunks.push_back(chunk);
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iter = heap->m_allocated_chunks.erase(iter);
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}
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}
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}
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free(heap);
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}
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/**
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* Frees chunks that was moved to the list m_freed_chunks
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* by the sweep phase. If there are more than a certain
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* amount of free chunks, delete the free chunks to
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* avoid cluttering.
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*
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* @param heap Heap singleton instance, only for avoiding
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* redundant calls to the singleton get
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*/
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void Heap::free(Heap *heap) {
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if (heap->m_freed_chunks.size() > FREE_THRESH) {
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while (heap->m_freed_chunks.size()) {
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auto chunk = heap->m_freed_chunks.back();
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heap->m_freed_chunks.pop_back();
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delete chunk;
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}
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}
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// if there are chunks but not more than FREE_THRESH
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else if (heap->m_freed_chunks.size()) {
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// essentially, always check for overlap between
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// chunks before finishing the allocation
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free_overlap(heap);
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}
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}
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/**
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* Iterates through the stack, if an element on the stack points to a chunk,
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* called a root chunk, that chunk is marked (i.e. reachable).
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* Then it recursively follows all chunks which are possibly reachable from
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* the root chunk and mark those chunks.
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* If a chunk is marked it is removed from the worklist, since it's no longer of
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* concern for this method.
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*
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* @param start Pointer to the start of the stack frame.
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* @param end Pointer to the end of the stack frame.
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* @param worklist The currently allocated chunks, which haven't been marked.
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*/
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void Heap::mark(uintptr_t *start, const uintptr_t *end, vector<Chunk *> &worklist)
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{
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int counter = 0;
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// To find adresses thats in the worklist
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for (; start < end; start++)
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{
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counter++;
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auto it = worklist.begin();
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auto stop = worklist.end();
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// for (auto it = worklist.begin(); it != worklist.end();) {
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while (it != stop)
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{
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Chunk *chunk = *it;
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/**
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* Checks for overlaps between freed chunks of memory
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* and removes overlapping chunks while prioritizing
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* the chunks at lower addresses.
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*
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* @param heap Heap singleton instance, only for avoiding
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* redundant calls to the singleton get
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*
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* @note Maybe this should be changed to prioritizing
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* larger chunks.
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*/
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void Heap::free_overlap(Heap *heap) {
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std::vector<Chunk *> filtered;
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size_t i = 0;
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// filtered.push_back(heap->m_freed_chunks.at(i++));
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filtered.push_back(getAt(heap->m_freed_chunks, i++));
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cout << filtered.back()->start << endl;
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for (; i < heap->m_freed_chunks.size(); i++) {
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auto prev = filtered.back();
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// auto next = heap->m_freed_chunks.at(i);
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auto next = getAt(heap->m_freed_chunks, i);
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auto p_start = (uintptr_t)(prev->start);
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auto p_size = (uintptr_t)(prev->size);
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auto n_start = (uintptr_t)(next->start);
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if (n_start >= (p_start + p_size)) {
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filtered.push_back(next);
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}
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}
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heap->m_freed_chunks.swap(filtered);
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}
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auto c_start = reinterpret_cast<uintptr_t>(chunk->start);
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auto c_size = reinterpret_cast<uintptr_t>(chunk->size);
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auto c_end = reinterpret_cast<uintptr_t>(c_start + c_size);
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// ----- ONLY DEBUGGING -----------------------------------------------------------------------
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cout << "Start points to:\t" << hex << *start << endl;
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cout << "Chunk start:\t\t" << hex << c_start << endl;
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cout << "Chunk end:\t\t" << hex << c_end << "\n"
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<< endl;
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/**
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* Prints the result of Heap::init() and a dummy value
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* for the current stack frame for reference.
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*/
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void Heap::check_init() {
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auto heap = Heap::the();
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cout << "Heap addr:\t" << heap << endl;
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cout << "GC m_stack_top:\t" << heap->m_stack_top << endl;
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auto stack_bottom = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
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cout << "GC stack_bottom:\t" << stack_bottom << endl;
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}
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/**
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* Conditional collection, only to be used in debugging
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*
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* @param flags Bitmap of flags
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*/
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void Heap::collect(uint flags) {
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// Check if the stack pointer aligns with the chunk
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if (c_start <= *start && *start < c_end)
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{
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cout << "DEBUG COLLECT\nFLAGS: ";
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if (flags & MARK)
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cout << "\n - MARK";
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if (flags & SWEEP)
|
||||
cout << "\n - SWEEP";
|
||||
if (flags & FREE)
|
||||
cout << "\n - FREE";
|
||||
cout << endl;
|
||||
|
||||
auto heap = Heap::the();
|
||||
if (!chunk->marked)
|
||||
{
|
||||
chunk->marked = true;
|
||||
// Remove the marked chunk from the worklist
|
||||
it = worklist.erase(it);
|
||||
// Recursively call mark, to see if the reachable chunk further points to another chunk
|
||||
mark((uintptr_t *)c_start, (uintptr_t *)c_end, worklist);
|
||||
}
|
||||
else
|
||||
{
|
||||
++it;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
++it;
|
||||
}
|
||||
}
|
||||
}
|
||||
cout << "Counter: " << counter << endl;
|
||||
}
|
||||
|
||||
// get the frame adress, whwere local variables and saved registers are located
|
||||
auto stack_bottom = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
|
||||
cout << "Stack bottom in collect:\t" << stack_bottom << endl;
|
||||
uintptr_t *stack_top;
|
||||
/**
|
||||
* Sweeps the heap, unmarks the marked chunks for the next cycle,
|
||||
* adds the unmarked nodes to the list of freed chunks; to be freed.
|
||||
*
|
||||
* @param heap Pointer to the heap singleton instance.
|
||||
*/
|
||||
void Heap::sweep(Heap *heap)
|
||||
{
|
||||
auto iter = heap->m_allocated_chunks.begin();
|
||||
auto stop = heap->m_allocated_chunks.end();
|
||||
// for (auto it = heap->m_allocated_chunks.begin(); it != heap->m_allocated_chunks.end();) {
|
||||
while (iter != stop)
|
||||
{
|
||||
Chunk *chunk = *iter;
|
||||
|
||||
if (heap->m_stack_top != nullptr)
|
||||
stack_top = heap->m_stack_top;
|
||||
else
|
||||
stack_top = (uintptr_t *) stack_bottom + 80; // dummy value
|
||||
// Unmark the marked chunks for the next iteration.
|
||||
if (chunk->marked)
|
||||
{
|
||||
chunk->marked = false;
|
||||
++iter;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Add the unmarked chunks to freed chunks and remove from
|
||||
// the list of allocated chunks
|
||||
heap->m_freed_chunks.push_back(chunk);
|
||||
iter = heap->m_allocated_chunks.erase(iter);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
cout << "Stack end in collect:\t " << stack_top << endl;
|
||||
auto work_list = heap->m_allocated_chunks;
|
||||
/**
|
||||
* Frees chunks that was moved to the list m_freed_chunks
|
||||
* by the sweep phase. If there are more than a certain
|
||||
* amount of free chunks, delete the free chunks to
|
||||
* avoid cluttering.
|
||||
*
|
||||
* @param heap Heap singleton instance, only for avoiding
|
||||
* redundant calls to the singleton get
|
||||
*/
|
||||
void Heap::free(Heap *heap)
|
||||
{
|
||||
if (heap->m_freed_chunks.size() > FREE_THRESH)
|
||||
{
|
||||
while (heap->m_freed_chunks.size())
|
||||
{
|
||||
auto chunk = heap->m_freed_chunks.back();
|
||||
heap->m_freed_chunks.pop_back();
|
||||
delete chunk;
|
||||
}
|
||||
}
|
||||
// if there are chunks but not more than FREE_THRESH
|
||||
else if (heap->m_freed_chunks.size())
|
||||
{
|
||||
// essentially, always check for overlap between
|
||||
// chunks before finishing the allocation
|
||||
free_overlap(heap);
|
||||
}
|
||||
}
|
||||
|
||||
if (flags & MARK) {
|
||||
mark(stack_bottom, stack_top, work_list);
|
||||
}
|
||||
/**
|
||||
* Checks for overlaps between freed chunks of memory
|
||||
* and removes overlapping chunks while prioritizing
|
||||
* the chunks at lower addresses.
|
||||
*
|
||||
* @param heap Heap singleton instance, only for avoiding
|
||||
* redundant calls to the singleton get
|
||||
*
|
||||
* @note Maybe this should be changed to prioritizing
|
||||
* larger chunks.
|
||||
*/
|
||||
void Heap::free_overlap(Heap *heap)
|
||||
{
|
||||
std::vector<Chunk *> filtered;
|
||||
size_t i = 0;
|
||||
// filtered.push_back(heap->m_freed_chunks.at(i++));
|
||||
filtered.push_back(getAt(heap->m_freed_chunks, i++));
|
||||
cout << filtered.back()->start << endl;
|
||||
for (; i < heap->m_freed_chunks.size(); i++)
|
||||
{
|
||||
auto prev = filtered.back();
|
||||
// auto next = heap->m_freed_chunks.at(i);
|
||||
auto next = getAt(heap->m_freed_chunks, i);
|
||||
auto p_start = (uintptr_t)(prev->start);
|
||||
auto p_size = (uintptr_t)(prev->size);
|
||||
auto n_start = (uintptr_t)(next->start);
|
||||
if (n_start >= (p_start + p_size))
|
||||
{
|
||||
filtered.push_back(next);
|
||||
}
|
||||
}
|
||||
heap->m_freed_chunks.swap(filtered);
|
||||
}
|
||||
|
||||
if (flags & SWEEP) {
|
||||
sweep(heap);
|
||||
}
|
||||
|
||||
if (flags & FREE) {
|
||||
free(heap);
|
||||
}
|
||||
}
|
||||
// ----- ONLY DEBUGGING -----------------------------------------------------------------------
|
||||
|
||||
// Mark child references from the root references
|
||||
void mark_test(vector<Chunk *> worklist) {
|
||||
while (worklist.size() > 0) {
|
||||
Chunk *ref = worklist.back();
|
||||
worklist.pop_back();
|
||||
Chunk *child = (Chunk*) ref; // this is probably not correct
|
||||
if (child != nullptr && !child->marked) {
|
||||
child->marked = true;
|
||||
worklist.push_back(child);
|
||||
mark_test(worklist);
|
||||
}
|
||||
}
|
||||
}
|
||||
/**
|
||||
* Prints the result of Heap::init() and a dummy value
|
||||
* for the current stack frame for reference.
|
||||
*/
|
||||
void Heap::check_init()
|
||||
{
|
||||
auto heap = Heap::the();
|
||||
cout << "Heap addr:\t" << heap << "\n";
|
||||
cout << "GC m_stack_top:\t" << heap->m_stack_top << "\n";
|
||||
auto stack_bottom = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
|
||||
cout << "GC stack_bottom:\t" << stack_bottom << endl;
|
||||
}
|
||||
|
||||
// Mark the root references and look for child references to them
|
||||
void mark_from_roots(uintptr_t *start, const uintptr_t *end) {
|
||||
vector<Chunk *> worklist;
|
||||
for (;start > end; start --) {
|
||||
if (*start % 8 == 0) { // all pointers must be aligned as double words
|
||||
Chunk *ref = (Chunk*) *start;
|
||||
if (ref != nullptr && !ref->marked) {
|
||||
ref->marked = true;
|
||||
worklist.push_back(ref);
|
||||
mark_test(worklist);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
/**
|
||||
* Conditional collection, only to be used in debugging
|
||||
*
|
||||
* @param flags Bitmap of flags
|
||||
*/
|
||||
void Heap::collect(uint flags)
|
||||
{
|
||||
|
||||
// For testing purposes
|
||||
void Heap::print_line(Chunk *chunk) {
|
||||
cout << "Marked: " << chunk->marked << "\nStart adr: " << chunk->start << "\nSize: " << chunk->size << " B\n" << endl;
|
||||
}
|
||||
cout << "DEBUG COLLECT\nFLAGS: ";
|
||||
if (flags & MARK)
|
||||
cout << "\n - MARK";
|
||||
if (flags & SWEEP)
|
||||
cout << "\n - SWEEP";
|
||||
if (flags & FREE)
|
||||
cout << "\n - FREE";
|
||||
cout << "\n";
|
||||
|
||||
void Heap::print_worklist(std::vector<Chunk *> list) {
|
||||
for (auto cp : list) {
|
||||
cout << "Chunk at:\t" << cp->start << "\nSize:\t\t" << cp->size << endl;
|
||||
}
|
||||
}
|
||||
auto heap = Heap::the();
|
||||
|
||||
void Heap::print_contents() {
|
||||
auto heap = Heap::the();
|
||||
if (heap->m_allocated_chunks.size()) {
|
||||
cout << "\nALLOCATED CHUNKS #" << dec << heap->m_allocated_chunks.size() << endl;
|
||||
for (auto chunk : heap->m_allocated_chunks) {
|
||||
print_line(chunk);
|
||||
}
|
||||
} else {
|
||||
cout << "NO ALLOCATIONS\n" << endl;
|
||||
}
|
||||
if (heap->m_freed_chunks.size()) {
|
||||
cout << "\nFREED CHUNKS #" << dec << heap->m_freed_chunks.size() << endl;
|
||||
for (auto fchunk : heap->m_freed_chunks) {
|
||||
print_line(fchunk);
|
||||
}
|
||||
} else {
|
||||
cout << "NO FREED CHUNKS" << endl;
|
||||
}
|
||||
}
|
||||
// get the frame adress, whwere local variables and saved registers are located
|
||||
auto stack_bottom = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
|
||||
cout << "Stack bottom in collect:\t" << stack_bottom << "\n";
|
||||
uintptr_t *stack_top = heap->m_stack_top;
|
||||
|
||||
void Heap::set_profiler(bool mode) {
|
||||
auto heap = Heap::the();
|
||||
heap->m_profiler_enable = mode;
|
||||
}
|
||||
cout << "Stack end in collect:\t " << stack_top << endl;
|
||||
auto work_list = heap->m_allocated_chunks;
|
||||
|
||||
if (flags & MARK)
|
||||
mark(stack_bottom, stack_top, work_list);
|
||||
|
||||
if (flags & SWEEP)
|
||||
sweep(heap);
|
||||
|
||||
if (flags & FREE)
|
||||
free(heap);
|
||||
}
|
||||
|
||||
// Mark child references from the root references
|
||||
void mark_test(vector<Chunk *> &worklist)
|
||||
{
|
||||
while (worklist.size() > 0)
|
||||
{
|
||||
Chunk *ref = worklist.back();
|
||||
worklist.pop_back();
|
||||
Chunk *child = (Chunk *)ref; // this is probably not correct
|
||||
if (child != nullptr && !child->marked)
|
||||
{
|
||||
child->marked = true;
|
||||
worklist.push_back(child);
|
||||
mark_test(worklist);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Mark the root references and look for child references to them
|
||||
void mark_from_roots(uintptr_t *start, const uintptr_t *end)
|
||||
{
|
||||
vector<Chunk *> worklist;
|
||||
for (; start > end; start--)
|
||||
{
|
||||
if (*start % 8 == 0)
|
||||
{ // all pointers must be aligned as double words
|
||||
Chunk *ref = (Chunk *)*start;
|
||||
if (ref != nullptr && !ref->marked)
|
||||
{
|
||||
ref->marked = true;
|
||||
worklist.push_back(ref);
|
||||
mark_test(worklist);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// For testing purposes
|
||||
void Heap::print_line(Chunk *chunk)
|
||||
{
|
||||
cout << "Marked: " << chunk->marked << "\nStart adr: " << chunk->start << "\nSize: " << chunk->size << " B\n"
|
||||
<< endl;
|
||||
}
|
||||
|
||||
void Heap::print_worklist(std::vector<Chunk *> &list)
|
||||
{
|
||||
for (auto cp : list)
|
||||
cout << "Chunk at:\t" << cp->start << "\nSize:\t\t" << cp->size << "\n";
|
||||
cout << endl;
|
||||
}
|
||||
|
||||
void Heap::print_contents()
|
||||
{
|
||||
auto heap = Heap::the();
|
||||
if (heap->m_allocated_chunks.size())
|
||||
{
|
||||
cout << "\nALLOCATED CHUNKS #" << dec << heap->m_allocated_chunks.size() << endl;
|
||||
for (auto chunk : heap->m_allocated_chunks)
|
||||
print_line(chunk);
|
||||
}
|
||||
else
|
||||
{
|
||||
cout << "NO ALLOCATIONS\n" << endl;
|
||||
}
|
||||
if (heap->m_freed_chunks.size())
|
||||
{
|
||||
cout << "\nFREED CHUNKS #" << dec << heap->m_freed_chunks.size() << endl;
|
||||
for (auto fchunk : heap->m_freed_chunks)
|
||||
print_line(fchunk);
|
||||
}
|
||||
else
|
||||
{
|
||||
cout << "NO FREED CHUNKS" << endl;
|
||||
}
|
||||
}
|
||||
|
||||
void Heap::set_profiler(bool mode)
|
||||
{
|
||||
auto heap = Heap::the();
|
||||
heap->m_profiler_enable = mode;
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue