303 lines
8.3 KiB
C++
303 lines
8.3 KiB
C++
#include "master.hpp"
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namespace factor {
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gc_event::gc_event(gc_op op, factor_vm* parent)
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: op(op),
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cards_scanned(0),
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decks_scanned(0),
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code_blocks_scanned(0),
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start_time(nano_count()),
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card_scan_time(0),
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code_scan_time(0),
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data_sweep_time(0),
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code_sweep_time(0),
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compaction_time(0) {
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data_heap_before = parent->data_room();
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code_heap_before = parent->code_room();
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start_time = nano_count();
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}
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void gc_event::started_card_scan() { temp_time = nano_count(); }
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void gc_event::ended_card_scan(cell cards_scanned_, cell decks_scanned_) {
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cards_scanned += cards_scanned_;
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decks_scanned += decks_scanned_;
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card_scan_time = (cell)(nano_count() - temp_time);
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}
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void gc_event::started_code_scan() { temp_time = nano_count(); }
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void gc_event::ended_code_scan(cell code_blocks_scanned_) {
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code_blocks_scanned += code_blocks_scanned_;
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code_scan_time = (cell)(nano_count() - temp_time);
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}
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void gc_event::started_data_sweep() { temp_time = nano_count(); }
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void gc_event::ended_data_sweep() {
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data_sweep_time = (cell)(nano_count() - temp_time);
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}
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void gc_event::started_code_sweep() { temp_time = nano_count(); }
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void gc_event::ended_code_sweep() {
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code_sweep_time = (cell)(nano_count() - temp_time);
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}
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void gc_event::started_compaction() { temp_time = nano_count(); }
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void gc_event::ended_compaction() {
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compaction_time = (cell)(nano_count() - temp_time);
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}
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void gc_event::ended_gc(factor_vm* parent) {
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data_heap_after = parent->data_room();
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code_heap_after = parent->code_room();
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total_time = (cell)(nano_count() - start_time);
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}
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gc_state::gc_state(gc_op op, factor_vm* parent) : op(op) {
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if (parent->gc_events) {
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event = new gc_event(op, parent);
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start_time = nano_count();
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} else
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event = NULL;
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}
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gc_state::~gc_state() {
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if (event) {
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delete event;
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event = NULL;
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}
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}
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void factor_vm::end_gc() {
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if (gc_events) {
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current_gc->event->ended_gc(this);
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gc_events->push_back(*current_gc->event);
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}
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}
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void factor_vm::start_gc_again() {
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end_gc();
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switch (current_gc->op) {
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case collect_nursery_op:
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/* Nursery collection can fail if aging does not have enough
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free space to fit all live objects from nursery. */
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current_gc->op = collect_aging_op;
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break;
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case collect_aging_op:
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/* Aging collection can fail if the aging semispace cannot fit
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all the live objects from the other aging semispace and the
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nursery. */
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current_gc->op = collect_to_tenured_op;
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break;
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default:
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/* Nothing else should fail mid-collection due to insufficient
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space in the target generation. */
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critical_error("Bad GC op", current_gc->op);
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break;
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}
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if (gc_events)
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current_gc->event = new gc_event(current_gc->op, this);
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}
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void factor_vm::set_current_gc_op(gc_op op) {
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current_gc->op = op;
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if (gc_events)
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current_gc->event->op = op;
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}
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void factor_vm::gc(gc_op op, cell requested_size, bool trace_contexts_p) {
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FACTOR_ASSERT(!gc_off);
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FACTOR_ASSERT(!current_gc);
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/* Important invariant: tenured space must have enough contiguous free
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space to fit the entire contents of the aging space and nursery. This is
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because when doing a full collection, objects from younger generations
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are promoted before any unreachable tenured objects are freed. */
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FACTOR_ASSERT(!data->high_fragmentation_p());
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current_gc = new gc_state(op, this);
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atomic::store(¤t_gc_p, true);
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/* Keep trying to GC higher and higher generations until we don't run
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out of space in the target generation. */
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for (;;) {
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try {
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if (gc_events)
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current_gc->event->op = current_gc->op;
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switch (current_gc->op) {
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case collect_nursery_op:
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collect_nursery();
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break;
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case collect_aging_op:
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/* We end up here if the above fails. */
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collect_aging();
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if (data->high_fragmentation_p()) {
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/* Change GC op so that if we fail again, we crash. */
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set_current_gc_op(collect_full_op);
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collect_full(trace_contexts_p);
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}
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break;
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case collect_to_tenured_op:
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/* We end up here if the above fails. */
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collect_to_tenured();
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if (data->high_fragmentation_p()) {
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/* Change GC op so that if we fail again, we crash. */
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set_current_gc_op(collect_full_op);
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collect_full(trace_contexts_p);
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}
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break;
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case collect_full_op:
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collect_full(trace_contexts_p);
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break;
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case collect_compact_op:
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collect_compact(trace_contexts_p);
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break;
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case collect_growing_heap_op:
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collect_growing_heap(requested_size, trace_contexts_p);
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break;
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default:
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critical_error("Bad GC op", current_gc->op);
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break;
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}
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break;
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}
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catch (const must_start_gc_again&) {
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/* We come back here if the target generation is full. */
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start_gc_again();
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continue;
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}
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}
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end_gc();
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atomic::store(¤t_gc_p, false);
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delete current_gc;
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current_gc = NULL;
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/* Check the invariant again, just in case. */
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FACTOR_ASSERT(!data->high_fragmentation_p());
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}
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/* primitive_minor_gc() is invoked by inline GC checks, and it needs to fill in
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uninitialized stack locations before actually calling the GC. See the
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comment in compiler.cfg.stacks.uninitialized for details. */
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struct call_frame_scrubber {
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factor_vm* parent;
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context* ctx;
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call_frame_scrubber(factor_vm* parent, context* ctx)
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: parent(parent), ctx(ctx) {}
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void operator()(void* frame_top, cell frame_size, code_block* owner,
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void* addr) {
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cell return_address = owner->offset(addr);
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gc_info* info = owner->block_gc_info();
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FACTOR_ASSERT(return_address < owner->size());
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cell index = info->return_address_index(return_address);
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if (index != (cell)-1)
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ctx->scrub_stacks(info, index);
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}
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};
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void factor_vm::scrub_context(context* ctx) {
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call_frame_scrubber scrubber(this, ctx);
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iterate_callstack(ctx, scrubber);
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}
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void factor_vm::scrub_contexts() {
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std::set<context*>::const_iterator begin = active_contexts.begin();
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std::set<context*>::const_iterator end = active_contexts.end();
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while (begin != end) {
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scrub_context(*begin);
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begin++;
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}
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}
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void factor_vm::primitive_minor_gc() {
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scrub_contexts();
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gc(collect_nursery_op, 0, /* requested size */
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true /* trace contexts? */);
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}
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void factor_vm::primitive_full_gc() {
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gc(collect_full_op, 0, /* requested size */
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true /* trace contexts? */);
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}
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void factor_vm::primitive_compact_gc() {
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gc(collect_compact_op, 0, /* requested size */
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true /* trace contexts? */);
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}
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/*
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* It is up to the caller to fill in the object's fields in a meaningful
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* fashion!
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*/
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/* Allocates memory */
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object* factor_vm::allot_large_object(cell type, cell size) {
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/* If tenured space does not have enough room, collect and compact */
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cell requested_size = size + data->high_water_mark();
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if (!data->tenured->can_allot_p(requested_size)) {
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primitive_compact_gc();
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/* If it still won't fit, grow the heap */
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if (!data->tenured->can_allot_p(requested_size)) {
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gc(collect_growing_heap_op, size, /* requested size */
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true /* trace contexts? */);
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}
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}
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object* obj = data->tenured->allot(size);
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/* Allows initialization code to store old->new pointers
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without hitting the write barrier in the common case of
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a nursery allocation */
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write_barrier(obj, size);
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obj->initialize(type);
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return obj;
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}
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void factor_vm::primitive_enable_gc_events() {
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gc_events = new std::vector<gc_event>();
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}
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/* Allocates memory (byte_array_from_value, result.add) */
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void factor_vm::primitive_disable_gc_events() {
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if (gc_events) {
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growable_array result(this);
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std::vector<gc_event>* gc_events = this->gc_events;
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this->gc_events = NULL;
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std::vector<gc_event>::const_iterator iter = gc_events->begin();
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std::vector<gc_event>::const_iterator end = gc_events->end();
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for (; iter != end; iter++) {
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gc_event event = *iter;
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byte_array* obj = byte_array_from_value(&event);
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result.add(tag<byte_array>(obj));
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}
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result.trim();
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ctx->push(result.elements.value());
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delete this->gc_events;
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} else
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ctx->push(false_object);
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}
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}
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