369 lines
12 KiB
C++
369 lines
12 KiB
C++
#include "master.hpp"
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namespace factor {
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static cell code_block_owner(code_block* compiled) {
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cell owner = compiled->owner;
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// Cold generic word call sites point to quotations that call the
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// inline-cache-miss and inline-cache-miss-tail primitives.
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if (TAG(owner) != QUOTATION_TYPE)
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return owner;
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quotation* quot = untag<quotation>(owner);
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array* elements = untag<array>(quot->array);
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FACTOR_ASSERT(array_capacity(elements) == 5);
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wrapper* wrap = untag<wrapper>(array_nth(elements, 0));
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return wrap->object;
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}
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static cell compute_entry_point_address(cell obj) {
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switch (TAG(obj)) {
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case WORD_TYPE:
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return untag<word>(obj)->entry_point;
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case QUOTATION_TYPE:
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return untag<quotation>(obj)->entry_point;
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default:
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critical_error("Expected word or quotation", obj);
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return 0;
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}
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}
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static cell compute_here_address(cell arg, cell offset, code_block* compiled) {
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fixnum n = untag_fixnum(arg);
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if (n >= 0)
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return compiled->entry_point() + offset + n;
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return compiled->entry_point() - n;
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}
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cell code_block::owner_quot() const {
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if (!optimized_p() && TAG(owner) == WORD_TYPE)
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return untag<word>(owner)->def;
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return owner;
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}
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// If the code block is an unoptimized quotation, we can calculate the
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// scan offset. In all other cases -1 is returned.
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// Allocates memory (quot_code_offset_to_scan)
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cell code_block::scan(factor_vm* vm, cell addr) const {
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if (type() != CODE_BLOCK_UNOPTIMIZED) {
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return tag_fixnum(-1);
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}
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cell ptr = owner;
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if (TAG(ptr) == WORD_TYPE)
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ptr = untag<word>(ptr)->def;
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if (TAG(ptr) != QUOTATION_TYPE)
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return tag_fixnum(-1);
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cell ofs = offset(addr);
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return tag_fixnum(vm->quot_code_offset_to_scan(ptr, ofs));
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}
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cell factor_vm::compute_entry_point_pic_address(word* w, cell tagged_quot) {
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if (!to_boolean(tagged_quot) || max_pic_size == 0)
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return w->entry_point;
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quotation* q = untag<quotation>(tagged_quot);
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if (quotation_compiled_p(q))
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return q->entry_point;
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return w->entry_point;
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}
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cell factor_vm::compute_entry_point_pic_address(cell w_) {
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tagged<word> w(w_);
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return compute_entry_point_pic_address(w.untagged(), w->pic_def);
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}
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cell factor_vm::compute_entry_point_pic_tail_address(cell w_) {
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tagged<word> w(w_);
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return compute_entry_point_pic_address(w.untagged(), w->pic_tail_def);
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}
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// Relocate new code blocks completely; updating references to literals,
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// dlsyms, and words. For all other words in the code heap, we only need
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// to update references to other words, without worrying about literals
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// or dlsyms.
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void factor_vm::update_word_references(code_block* compiled,
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bool reset_inline_caches) {
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if (code->uninitialized_p(compiled)) {
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initialize_code_block(compiled);
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// update_word_references() is always applied to every block in
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// the code heap. Since it resets all call sites to point to
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// their canonical entry point (cold entry point for non-tail calls,
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// standard entry point for tail calls), it means that no PICs
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// are referenced after this is done. So instead of polluting
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// the code heap with dead PICs that will be freed on the next
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// GC, we add them to the free list immediately.
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} else if (reset_inline_caches && compiled->pic_p()) {
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code->free(compiled);
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} else {
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auto visit_func = [&](instruction_operand op) {
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switch (op.rel.type()) {
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case RT_ENTRY_POINT: {
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code_block* dest = op.load_code_block();
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cell owner = dest->owner;
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if (to_boolean(owner))
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op.store_value(compute_entry_point_address(owner));
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break;
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}
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case RT_ENTRY_POINT_PIC: {
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code_block* dest = op.load_code_block();
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if (reset_inline_caches || !dest->pic_p()) {
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cell owner = code_block_owner(dest);
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if (to_boolean(owner))
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op.store_value(compute_entry_point_pic_address(owner));
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}
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break;
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}
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case RT_ENTRY_POINT_PIC_TAIL: {
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code_block* dest = op.load_code_block();
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if (reset_inline_caches || !dest->pic_p()) {
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cell owner = code_block_owner(dest);
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if (to_boolean(owner))
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op.store_value(compute_entry_point_pic_tail_address(owner));
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}
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break;
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}
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default:
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break;
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}
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};
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compiled->each_instruction_operand(visit_func);
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compiled->flush_icache();
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}
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}
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// Look up an external library symbol referenced by a compiled code block
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cell factor_vm::compute_dlsym_address(array* parameters,
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cell index,
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bool toc) {
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cell symbol = array_nth(parameters, index);
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cell library = array_nth(parameters, index + 1);
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dll* d = to_boolean(library) ? untag<dll>(library) : NULL;
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cell undef = (cell)factor::undefined_symbol;
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undef = toc ? FUNCTION_TOC_POINTER(undef) : FUNCTION_CODE_POINTER(undef);
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if (d != NULL && !d->handle)
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return undef;
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FACTOR_ASSERT(TAG(symbol) == BYTE_ARRAY_TYPE);
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symbol_char* name = alien_offset(symbol);
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cell sym = ffi_dlsym_raw(d, name);
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sym = toc ? FUNCTION_TOC_POINTER(sym) : FUNCTION_CODE_POINTER(sym);
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return sym ? sym : undef;
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}
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cell factor_vm::lookup_external_address(relocation_type rel_type,
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code_block *compiled,
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array* parameters,
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cell index) {
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switch (rel_type) {
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case RT_DLSYM:
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return compute_dlsym_address(parameters, index, false);
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case RT_THIS:
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return compiled->entry_point();
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case RT_MEGAMORPHIC_CACHE_HITS:
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return (cell)&dispatch_stats.megamorphic_cache_hits;
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case RT_VM:
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return (cell)this + untag_fixnum(array_nth(parameters, index));
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case RT_CARDS_OFFSET:
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return cards_offset;
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case RT_DECKS_OFFSET:
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return decks_offset;
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#ifdef FACTOR_PPC
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case RT_DLSYM_TOC:
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return compute_dlsym_address(parameters, index, true);
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#endif
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case RT_INLINE_CACHE_MISS:
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return (cell)&factor::inline_cache_miss;
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case RT_SAFEPOINT:
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return code->safepoint_page;
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default:
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return -1;
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}
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}
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cell factor_vm::compute_external_address(instruction_operand op) {
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code_block* compiled = op.compiled;
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array* parameters = to_boolean(compiled->parameters)
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? untag<array>(compiled->parameters)
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: NULL;
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cell idx = op.index;
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relocation_type rel_type = op.rel.type();
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cell ext_addr = lookup_external_address(rel_type, compiled, parameters, idx);
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if (ext_addr == (cell)-1) {
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ostringstream ss;
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print_obj(ss, compiled->owner);
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ss << ": ";
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cell arg;
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if (rel_type == RT_DLSYM || rel_type == RT_DLSYM_TOC) {
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ss << "Bad symbol specifier in compute_external_address";
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arg = array_nth(parameters, idx);
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} else {
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ss << "Bad rel type in compute_external_address";
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arg = rel_type;
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}
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critical_error(ss.str().c_str(), arg);
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}
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return ext_addr;
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}
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struct initial_code_block_visitor {
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factor_vm* parent;
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cell literals;
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cell literal_index;
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initial_code_block_visitor(factor_vm* parent, cell literals)
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: parent(parent), literals(literals), literal_index(0) {}
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cell next_literal() {
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return array_nth(untag<array>(literals), literal_index++);
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}
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fixnum compute_operand_value(instruction_operand op) {
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switch (op.rel.type()) {
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case RT_LITERAL:
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return next_literal();
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case RT_ENTRY_POINT:
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return compute_entry_point_address(next_literal());
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case RT_ENTRY_POINT_PIC:
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return parent->compute_entry_point_pic_address(next_literal());
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case RT_ENTRY_POINT_PIC_TAIL:
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return parent->compute_entry_point_pic_tail_address(next_literal());
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case RT_HERE:
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return compute_here_address(
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next_literal(), op.rel.offset(), op.compiled);
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case RT_UNTAGGED:
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return untag_fixnum(next_literal());
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default:
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return parent->compute_external_address(op);
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}
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}
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void operator()(instruction_operand op) {
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op.store_value(compute_operand_value(op));
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}
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};
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// Perform all fixups on a code block
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void factor_vm::initialize_code_block(code_block* compiled, cell literals) {
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initial_code_block_visitor visitor(this, literals);
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compiled->each_instruction_operand(visitor);
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compiled->flush_icache();
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// next time we do a minor GC, we have to trace this code block, since
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// the newly-installed instruction operands might point to literals in
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// nursery or aging
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code->write_barrier(compiled);
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}
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void factor_vm::initialize_code_block(code_block* compiled) {
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std::map<code_block*, cell>::iterator iter =
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code->uninitialized_blocks.find(compiled);
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initialize_code_block(compiled, iter->second);
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code->uninitialized_blocks.erase(iter);
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}
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// Fixup labels. This is done at compile time, not image load time
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void factor_vm::fixup_labels(array* labels, code_block* compiled) {
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cell size = array_capacity(labels);
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for (cell i = 0; i < size; i += 3) {
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relocation_class rel_class =
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(relocation_class) untag_fixnum(array_nth(labels, i));
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cell offset = untag_fixnum(array_nth(labels, i + 1));
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cell target = untag_fixnum(array_nth(labels, i + 2));
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relocation_entry new_entry(RT_HERE, rel_class, offset);
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instruction_operand op(new_entry, compiled, 0);
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op.store_value(target + compiled->entry_point());
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}
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}
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// Might GC
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// Allocates memory
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code_block* factor_vm::add_code_block(code_block_type type, cell code_,
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cell labels_, cell owner_,
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cell relocation_, cell parameters_,
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cell literals_,
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cell frame_size_untagged) {
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data_root<byte_array> code(code_, this);
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data_root<object> labels(labels_, this);
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data_root<object> owner(owner_, this);
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data_root<byte_array> relocation(relocation_, this);
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data_root<array> parameters(parameters_, this);
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data_root<array> literals(literals_, this);
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cell code_length = array_capacity(code.untagged());
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code_block* compiled = allot_code_block(code_length, type);
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compiled->owner = owner.value();
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// slight space optimization
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if (relocation.type() == BYTE_ARRAY_TYPE &&
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array_capacity(relocation.untagged()) == 0)
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compiled->relocation = false_object;
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else
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compiled->relocation = relocation.value();
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if (parameters.type() == ARRAY_TYPE &&
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array_capacity(parameters.untagged()) == 0)
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compiled->parameters = false_object;
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else
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compiled->parameters = parameters.value();
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// code
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memcpy(compiled + 1, code.untagged() + 1, code_length);
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// fixup labels
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if (to_boolean(labels.value()))
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fixup_labels(labels.as<array>().untagged(), compiled);
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compiled->set_stack_frame_size(frame_size_untagged);
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// Once we are ready, fill in literal and word references in this code
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// block's instruction operands. In most cases this is done right after this
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// method returns, except when compiling words with the non-optimizing
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// compiler at the beginning of bootstrap
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this->code->uninitialized_blocks.insert(
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std::make_pair(compiled, literals.value()));
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this->code->all_blocks.insert((cell)compiled);
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return compiled;
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}
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// References to undefined symbols are patched up to call this function on
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// image load. It finds the symbol and library, and throws an error.
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void factor_vm::undefined_symbol() {
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cell frame = ctx->callstack_top;
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cell return_address = *(cell*)frame;
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code_block* compiled = code->code_block_for_address(return_address);
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// Find the RT_DLSYM relocation nearest to the given return address.
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cell symbol = false_object;
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cell library = false_object;
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auto find_symbol_at_address_visitor = [&](instruction_operand op) {
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if (op.rel.type() == RT_DLSYM && op.pointer <= return_address) {
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array* parameters = untag<array>(compiled->parameters);
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cell index = op.index;
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symbol = array_nth(parameters, index);
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library = array_nth(parameters, index + 1);
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}
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};
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compiled->each_instruction_operand(find_symbol_at_address_visitor);
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if (!to_boolean(symbol))
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critical_error("Can't find RT_DLSYM at return address", return_address);
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else
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general_error(ERROR_UNDEFINED_SYMBOL, symbol, library);
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}
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void undefined_symbol() {
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return current_vm()->undefined_symbol();
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}
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}
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