Wrote a test for shared library linking
This commit is contained in:
Victor Olin
parent
518940ab15
commit
3473c953b5
7 changed files with 139 additions and 69 deletions
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@ -7,7 +7,7 @@
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#include <stdlib.h>
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#include <vector>
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#include "heap.hpp"
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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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@ -18,6 +18,13 @@ namespace GC {
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* this address points to the stack frame of the compiled
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* LLVM executable after linking. (NOT CONFIRMED)
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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 << "GC m_stack_end:\t" << heap->m_stack_end << endl;
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auto stack_start = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
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cout << "GC stack_start:\t" << stack_start << endl;
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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_end = reinterpret_cast<uintptr_t *>(__builtin_frame_address(1));
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@ -43,13 +50,13 @@ namespace GC {
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}
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if (heap->m_size + size > HEAP_SIZE) {
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collect();
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collect(heap);
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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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// If a chunk was recycled, return the old chunk address
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uintptr_t *reused_chunk = try_recycle_chunks(size);
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uintptr_t *reused_chunk = try_recycle_chunks(heap, 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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@ -58,18 +65,17 @@ namespace GC {
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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 *)m_heap + m_size;
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new_chunk->start = (uintptr_t *)(heap->m_heap + m_size);
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m_size += size;
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heap->m_size += size;
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m_allocated_chunks.push_back(new_chunk);
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heap->m_allocated_chunks.push_back(new_chunk);
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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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uintptr_t *Heap::try_recycle_chunks(size_t size) {
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auto heap = Heap::the();
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uintptr_t *Heap::try_recycle_chunks(Heap *heap, size_t size) {
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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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@ -92,16 +98,16 @@ namespace GC {
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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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m_freed_chunks.erase(m_freed_chunks.begin() + i);
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m_allocated_chunks.push_back(cp);
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heap->m_freed_chunks.erase(m_freed_chunks.begin() + i);
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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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void Heap::collect() {
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void Heap::collect(Heap *heap) {
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// Get the adress of the current stack frame
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auto heap = Heap::the();
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uintptr_t *stack_end;
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@ -111,38 +117,38 @@ namespace GC {
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else
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stack_end = (uintptr_t *)0; // temporary
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auto work_list = m_allocated_chunks;
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auto work_list = heap->m_allocated_chunks;
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mark(stack_start, stack_end, work_list);
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sweep();
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sweep(heap);
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free();
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free(heap);
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}
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void Heap::free() {
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if (m_freed_chunks.size() > FREE_THRESH) {
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while (m_freed_chunks.size()) {
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auto chunk = m_freed_chunks.back();
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m_freed_chunks.pop_back();
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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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} else {
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free_overlap();
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free_overlap(heap);
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}
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}
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void Heap::free_overlap() {
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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(m_freed_chunks.at(i++));
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for (; i < m_freed_chunks.size(); i++) {
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filtered.push_back(heap->m_freed_chunks.at(i++));
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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 = m_freed_chunks.at(i);
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auto next = heap->m_freed_chunks.at(i);
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if (next->start > (prev->start + prev->size)) {
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filtered.push_back(next);
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}
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}
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m_freed_chunks.swap(filtered);
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heap->m_freed_chunks.swap(filtered);
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}
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void Heap::collect(uint flags) {
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@ -155,16 +161,20 @@ namespace GC {
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if (flags & FREE)
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cout << "\n - FREE";
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cout << endl;
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auto heap = Heap::the();
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// get the frame adress, whwere local variables and saved registers are located
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auto stack_start = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
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cout << "Stack start:\t" << stack_start << endl;
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uintptr_t *stack_end;
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const uintptr_t *stack_end = (uintptr_t *) stack_start - 40; // dummy value
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// denna segfaultar om arg för __b_f_a är > 2
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// reinterpret_cast<const uintptr_t *>(__builtin_frame_address(10));
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if (heap->m_stack_end != nullptr)
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stack_end = heap->m_stack_end;
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else
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stack_end = (uintptr_t *) stack_start - 40; // dummy value
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auto work_list = m_allocated_chunks;
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auto work_list = heap->m_allocated_chunks;
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// print_worklist(work_list);
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if (flags & MARK) {
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@ -172,31 +182,22 @@ namespace GC {
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}
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if (flags & SWEEP) {
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sweep();
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sweep(heap);
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}
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if (flags & FREE) {
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free();
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free(heap);
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}
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//release free chunks
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// if (flags & FREE) {
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// while (m_freed_chunks.size()) {
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// auto chunk_pointer = m_freed_chunks.back();
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// m_freed_chunks.pop_back();
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// delete chunk_pointer; // deletes chunk object, doesn't free heap memory to the OS
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// }
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// }
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}
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// Not optimal for now, it doesn't have to loop over all objects
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// but mark needs some refinements before this can be optimised
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void Heap::sweep() {
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for (auto it = m_allocated_chunks.begin(); it != m_allocated_chunks.end();) {
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void Heap::sweep(Heap *heap) {
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for (auto it = heap->m_allocated_chunks.begin(); it != heap->m_allocated_chunks.end();) {
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auto chunk = *it;
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if (!chunk->marked) {
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m_freed_chunks.push_back(chunk);
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it = m_allocated_chunks.erase(it);
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heap->m_freed_chunks.push_back(chunk);
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it = heap->m_allocated_chunks.erase(it);
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}
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else {
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++it;
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@ -240,17 +241,18 @@ namespace GC {
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}
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void Heap::print_contents() {
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if (m_allocated_chunks.size()) {
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cout << "\nALLOCATED CHUNKS #" << m_allocated_chunks.size() << endl;
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for (auto chunk : m_allocated_chunks) {
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auto heap = Heap::the();
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if (heap->m_allocated_chunks.size()) {
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cout << "\nALLOCATED CHUNKS #" << heap->m_allocated_chunks.size() << endl;
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for (auto chunk : heap->m_allocated_chunks) {
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print_line(chunk);
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}
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} else {
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cout << "NO ALLOCATIONS\n" << endl;
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}
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if (m_freed_chunks.size()) {
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cout << "\nFREED CHUNKS #" << m_freed_chunks.size() << endl;
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for (auto fchunk : m_freed_chunks) {
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if (heap->m_freed_chunks.size()) {
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cout << "\nFREED CHUNKS #" << heap->m_freed_chunks.size() << endl;
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for (auto fchunk : heap->m_freed_chunks) {
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print_line(fchunk);
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}
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} else {
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