739 lines
25 KiB
C++
739 lines
25 KiB
C++
/** @file VirtualSchematikaMachine.cpp
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*
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* @author Roland Conybeare, Jan 2026
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**/
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#include "VirtualSchematikaMachine.hpp"
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#include "VsmApplyFrame.hpp"
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#include "VsmEvalArgsFrame.hpp"
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#include "VsmApplyClosureFrame.hpp"
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#include "VsmIfElseContFrame.hpp"
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#include "VsmSeqContFrame.hpp"
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#include "VsmRcx.hpp"
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#include "Closure.hpp"
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#include <xo/expression2/ApplyExpr.hpp>
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#include <xo/expression2/LambdaExpr.hpp>
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#include <xo/expression2/Constant.hpp>
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#include <xo/expression2/SequenceExpr.hpp>
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#include <xo/object2/Boolean.hpp>
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#include <xo/procedure2/RuntimeContext.hpp>
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//#include <xo/procedure2/SimpleRcx.hpp>
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#include <xo/gc/DX1Collector.hpp>
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#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
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#include <xo/alloc2/Arena.hpp>
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#include <xo/printable2/Printable.hpp>
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#include <xo/facet/FacetRegistry.hpp>
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#include <cassert>
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namespace xo {
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using xo::print::APrintable;
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using xo::print::ppconfig;
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using xo::print::ppstate_standalone;
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using xo::mm::AGCObject;
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//using xo::mm::MemorySizeInfo; // not used yet
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using xo::mm::AAllocator;
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using xo::mm::DX1Collector;
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using xo::mm::DArena;
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using xo::facet::FacetRegistry;
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using std::cout;
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namespace scm {
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bool
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VsmResult::is_eval_error() const
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{
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if (std::holds_alternative<obj<AGCObject>>(result_)) {
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auto err = obj<AGCObject,DRuntimeError>::from(*(this->value()));
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return err;
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} else {
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return false;
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}
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}
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// NOTE: using heap here for {DX1Collector, DArena, DVsmRcx} instances
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// (though DX1Collector allocations will be from explictly mmap'd memory)
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//
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VirtualSchematikaMachine::VirtualSchematikaMachine(const VsmConfig & config)
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: config_{config},
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mm_(box<AAllocator,DX1Collector>(new DX1Collector(config.x1_config_))),
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rcx_(box<ARuntimeContext,DVsmRcx>(new DVsmRcx(this))),
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reader_{config.rdr_config_, mm_.to_op()}
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{
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{
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DArena * arena = new DArena();
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assert(arena);
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*arena = DArena::map(config_.error_config_);
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error_mm_.adopt(obj<AAllocator,DArena>(arena));
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}
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// TODO: allocate global_env
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}
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obj<AAllocator>
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VirtualSchematikaMachine::allocator() const noexcept
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{
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return mm_.to_op();
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}
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obj<AAllocator>
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VirtualSchematikaMachine::error_allocator() const noexcept
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{
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return error_mm_.to_op();
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}
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void
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VirtualSchematikaMachine::visit_pools(const MemorySizeVisitor & visitor) const
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{
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mm_.visit_pools(visitor);
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error_mm_.visit_pools(visitor);
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reader_.visit_pools(visitor);
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}
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void
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VirtualSchematikaMachine::begin_interactive_session()
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{
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reader_.begin_interactive_session();
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}
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void
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VirtualSchematikaMachine::begin_batch_session()
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{
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reader_.begin_batch_session();
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}
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VsmResultExt
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VirtualSchematikaMachine::read_eval_print(span_type input, bool eof)
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{
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if (input.empty()) {
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return VsmResultExt();
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}
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auto [expr, remaining, error1]
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= reader_.read_expr(input, eof);
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if (!expr) {
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/* tokenizer error */
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return VsmResultExt(VsmResult(error1), remaining);
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}
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VsmResult evalresult = this->start_eval(expr);
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if (evalresult.is_eval_error() || evalresult.is_tk_error()) {
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return VsmResultExt(evalresult, remaining);
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}
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assert(evalresult.is_value());
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obj<AGCObject> * p_value = std::get_if<obj<AGCObject>>(&(evalresult.result_));
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assert(p_value);
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obj<APrintable> value_pr
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= FacetRegistry::instance().variant<APrintable,AGCObject>(*p_value);
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// pretty_toplevel(value_pr, &cout, ppconfig());
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ppconfig ppc;
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ppstate_standalone pps(&cout, 0, &ppc);
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pps.prettyn(value_pr);
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return VsmResultExt(VsmResult(*p_value), remaining);
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}
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VsmResult
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VirtualSchematikaMachine::start_eval(obj<AExpression> expr)
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{
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this->pc_ = VsmInstr::c_eval;
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this->expr_ = expr;
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this->value_ = VsmResult(obj<AGCObject>());
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this->cont_ = VsmInstr::c_halt;
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this->run();
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return value_;
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}
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void
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VirtualSchematikaMachine::run()
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{
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while (this->execute_one())
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;
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}
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bool
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VirtualSchematikaMachine::execute_one()
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{
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scope log(XO_DEBUG(true));
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log && log(xtag("pc", pc_),
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xtag("cont", cont_));
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obj<APrintable> stack_pr = stack_.to_facet<APrintable>();
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// = (FacetRegistry::instance()
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// .try_variant<APrintable,AGCObject>(stack_));
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if (stack_pr)
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log && log(xtag("stack", stack_pr));
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switch (pc_.opcode()) {
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case vsm_opcode::halt:
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case vsm_opcode::N:
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return false;
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case vsm_opcode::eval:
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_do_eval_op();
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break;
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case vsm_opcode::apply:
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_do_apply_op();
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break;
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case vsm_opcode::evalargs:
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_do_evalargs_op();
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break;
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case vsm_opcode::apply_cont:
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_do_apply_cont_op();
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break;
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case vsm_opcode::ifelse_cont:
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_do_ifelse_cont_op();
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break;
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case vsm_opcode::seq_cont:
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_do_seq_cont_op();
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break;
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}
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return true;
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}
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void
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VirtualSchematikaMachine::_do_eval_op()
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{
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switch(expr_.extype()) {
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case exprtype::invalid:
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case exprtype::N:
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break;
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case exprtype::constant:
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_do_eval_constant_op();
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break;
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case exprtype::define:
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_do_eval_define_op();
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break;
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case exprtype::lambda:
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_do_eval_lambda_op();
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break;
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case exprtype::variable:
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_do_eval_variable_op();
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break;
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case exprtype::varref:
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_do_eval_varref_op();
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break;
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case exprtype::apply:
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_do_eval_apply_op();
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break;
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case exprtype::ifexpr:
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_do_eval_if_else_op();
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break;
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case exprtype::sequence:
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_do_eval_sequence_op();
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break;
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}
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}
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void
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VirtualSchematikaMachine::_do_eval_constant_op()
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{
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auto expr
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= obj<AExpression,DConstant>::from(expr_);
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this->value_ = VsmResult(expr.data()->value());
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this->pc_ = this->cont_;
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}
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void
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VirtualSchematikaMachine::_do_eval_define_op()
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{
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// not implemented
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assert(false);
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}
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void
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VirtualSchematikaMachine::_do_eval_lambda_op()
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{
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// assuming bump allocator
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//
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// +----------- DArray---------+ +-------------DLocalEnv-----------+ +-----DClosure-------+
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// | .cap |.size | .elts_[]... |h| .parent x | .symtab x | .args x |h| .lambda x | .env x |
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// +------+------+-------------+ +---------|-+---------|-+-------|-+ +---------|-+------|-+
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// ^ ^ | | | | |
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// \-----------------------------|---------|-----------|---------/ | |
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// | | | | |
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// \---------|-----------|-----------------------|--------/
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// | | |
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// <--------------------------------------/ | |
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// | |
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// v v
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// DLocalSymtab DLambdaExpr
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//
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// DClosure runtime procedure (created below)
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// DArray bound non-local variables (established by VSM)
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// DLocalEnv local environment (copy ref from VSM state)
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// h alloc header
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// DLocalSymtab local symbol table (created by parser)
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// DLambdaExpr lambda expression (created by parser)
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//
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// will create DClosure with local_env_
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// local_env_
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// global_env_
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auto lambda
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= obj<AExpression,DLambdaExpr>::from(expr_);
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DClosure * closure = DClosure::make(mm_.to_op(),
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lambda.data(),
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local_env_);
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this->value_
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= VsmResult(obj<AGCObject>(obj<AGCObject,DClosure>(closure)));
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this->pc_ = this->cont_;
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}
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void
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VirtualSchematikaMachine::_do_eval_variable_op()
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{
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// not implemented
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assert(false);
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}
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void
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VirtualSchematikaMachine::_do_eval_varref_op()
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{
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auto var = obj<AExpression,DVarRef>::from(expr_);
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Binding b = var->path();
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if (!local_env_) {
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// need lookup on global_env_
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assert(false);
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}
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auto value = local_env_->lookup_value(b);
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if (value) {
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this->value_ = VsmResult(value);
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this->pc_ = this->cont_;
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return;
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}
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// no binding
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auto error = DRuntimeError::make(mm_.to_op(),
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"_do_eval_varref_op",
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"no binding for variable");
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this->value_ = VsmResult(error);
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// for now: halt VSM execution
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// TODO: some combination of
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// 1. emit stack trace
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// 2. go to debugger
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// 3. have every vsm instruction check inputs for errors
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this->pc_ = VsmInstr::c_halt;
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}
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void
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VirtualSchematikaMachine::_do_eval_apply_op()
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{
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// ApplyExpr in expr_ register
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// assuming bump allocator:
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//
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// DArray VsmApplyFrame VsmEvalArgsFrame
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// v v v
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// +----------------------+-------+-------+----+--------+-------+-------+-------+
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// | argument expressions | par x | cont1 | fn | args x | par x | cont2 | i_arg |
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// +----------------------+-----|-+-------+----+------|-+-----|-+-------+-------+
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// ^ ^ | | |
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// | \-----------------------------------/
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// \ | /
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// \------------------------------------------------/
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// /
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// <---------------------------/
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//
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// - VsmEvalArgsFrame: owned by VSM, state for evalargs loop
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// - VsmApplyFrame: owned by VSM, state for transferring control to called function
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// - DArray: contains evaluated args; owned by called primitive
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// - cont2: always c_apply
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//
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auto apply = obj<AExpression,DApplyExpr>::from(expr_);
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// accumulate evaluated arguments here
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DArray * args = DArray::empty(mm_.to_op(),
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apply->n_args());
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// TODO: check function signature
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DVsmApplyFrame * apply_frame
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= DVsmApplyFrame::make(mm_.to_op(), stack_, cont_, args);
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auto evalargs_frame
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= obj<AGCObject,DVsmEvalArgsFrame>
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(DVsmEvalArgsFrame::make(mm_.to_op(),
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apply_frame, VsmInstr::c_apply, apply.data()));
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this->stack_ = evalargs_frame;
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// Setup evaluation of first argument. No new stack for this.
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this->cont_ = VsmInstr::c_evalargs;
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this->expr_ = apply->fn();
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this->pc_ = VsmInstr::c_eval;
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}
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void
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VirtualSchematikaMachine::_do_eval_if_else_op()
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{
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// control:
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// self -> eval(test) -> ifelse_cont -> eval(when_true)
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// -> eval(when_false)
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auto ifelse_expr = obj<AExpression,DIfElseExpr>::from(expr_);
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obj<AGCObject,DVsmIfElseContFrame> ifelse_frame
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(DVsmIfElseContFrame::make(mm_.to_op(),
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stack_, cont_, ifelse_expr.data()));
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this->stack_ = ifelse_frame;
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this->cont_ = VsmInstr::c_ifelse_cont;
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this->expr_ = ifelse_expr->test();
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this->pc_ = VsmInstr::c_eval;
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}
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void
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VirtualSchematikaMachine::_do_eval_sequence_op()
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{
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// stack:
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//
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// VsmEvalSequence
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// v
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// +-------+------+-------+-------+
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// | par x | cont | seq | i_elt |
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// +-----|-+------+-------+-------+
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// |
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// <-----/
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//
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auto seq_expr = obj<AExpression,DSequenceExpr>::from(expr_);
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if (seq_expr->size() == 0) {
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/* empty sequence expression does not produce a value */
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this->value_ = VsmResult(obj<AGCObject>());
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this->pc_ = this->cont_;
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return;
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}
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auto seqexpr_frame
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= obj<AGCObject,DVsmSeqContFrame>
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(DVsmSeqContFrame::make(mm_.to_op(),
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this->stack_ /*saved stack*/,
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this->cont_ /*saved cont*/,
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seq_expr.data() /*saved expr*/,
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0 /*index of seq element*/));
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this->stack_ = seqexpr_frame;
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// Setup evaluation of first sequence element
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this->cont_ = VsmInstr::c_seq_cont;
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this->expr_ = (*seq_expr.data())[0];
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this->pc_ = VsmInstr::c_eval;
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}
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void
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VirtualSchematikaMachine::_do_apply_op()
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{
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// rcx_ : runtime context
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// fn_ : function to call
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// args_ : array of arguments
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// TODO: check argument types
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auto closure = obj<AGCObject,DClosure>::from(fn_);
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if (closure) {
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_do_call_closure_op();
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return;
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} else {
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_do_call_primitive_op();
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return;
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}
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}
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void
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VirtualSchematikaMachine::_do_call_closure_op()
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{
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// We need to preserve registers while evaluating
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// lambda body
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auto closure = obj<AGCObject,DClosure>::from(fn_);
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assert(closure);
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// TODO: for tail recursion:
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// check whether stack_ already refers to a
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// DVsmApplyClosureFrame instance, in which case
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// we can just refer to it instead of pushing a new one
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if (cont_ == VsmInstr::c_apply_cont) {
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// we are making a tail call.
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// No need to preserve (stack, cont, local_env),
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// since continuation will restore on top of them
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// frame top stackframe anyway
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} else {
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obj<AGCObject,
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DVsmApplyClosureFrame> frame(
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DVsmApplyClosureFrame::make(mm_.to_op(),
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stack_,
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cont_,
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local_env_));
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// push frame w/ saved vsm registers
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this->stack_ = frame;
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this->cont_ = VsmInstr::c_apply_cont;
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}
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auto lambda = closure->lambda();
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auto local_env
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= DLocalEnv::_make(mm_.to_op(),
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local_env_,
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lambda->local_symtab(),
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args_);
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this->local_env_ = local_env;
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this->expr_ = lambda->body_expr();
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this->pc_ = VsmInstr::c_eval;
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}
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void
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VirtualSchematikaMachine::_do_call_primitive_op()
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{
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auto fn = fn_.to_facet<AProcedure>();
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this->value_ = VsmResult(fn.apply_nocheck(rcx_.to_op(), args_));
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this->pc_ = cont_;
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}
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void
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VirtualSchematikaMachine::_do_evalargs_op()
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{
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scope log(XO_DEBUG(false));
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if (!value_.is_value()) {
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// error while evaluating function arg
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log.retroactively_enable();
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log && log("error in apply -> terminating app");
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this->pc_ = VsmInstr::c_halt;
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return;
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}
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// here: nested evaluation succeeded
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// value of one of {fn, arg(i), ..} in fn(arg0 .. arg(n-1))
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//
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obj<AGCObject> value = *(value_.value());
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// value_ in [i_arg] value_
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// . (if i_arg >= 0) . (if i_arg = -1)
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// . .
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// DArray . VsmApplyFrame . VsmEvalArgsFrame
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// v v v v v
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// +----------------------+-------+-------+----+--------+-------+-------+--------+-------+
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// | argument expressions | par o | cont1 | fn | args x | par o | cont2 | applyx | i_arg |
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// +----------------------+-----|-+-------+----+------|-+-----|-+-------+--------+-------+
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// ^ ^ | | |
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// | \-----------------------------------/
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// \ | /
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// \------------------------------------------------/
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// /
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// <---------------------------/
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//
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// - VsmEvalArgsFrame: owned by VSM, state for evalargs loop
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// - VsmApplyFrame: owned by VSM, state for transferring control to called function
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// - DArray: contains evaluated args; owned by called primitive
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|
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// - i_arg
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// if -1: value_ register holds function
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// if >=0: value_ register holds i'th function argument
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//
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|
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auto evalargs_frame
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= obj<AGCObject,DVsmEvalArgsFrame>::from(stack_);
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|
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assert(evalargs_frame);
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|
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int32_t i_arg = evalargs_frame->i_arg();
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|
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DVsmApplyFrame * apply_frame = evalargs_frame->parent();
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|
|
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const DApplyExpr * apply_expr
|
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= evalargs_frame->apply_expr();
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|
|
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if (i_arg == -1) {
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bool is_closure = obj<AGCObject,DClosure>::from(value);
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bool is_native_fn = value.try_to_facet<AProcedure>();
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|
|
|
if (is_native_fn || is_closure) {
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apply_frame->assign_fn(value);
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|
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i_arg = evalargs_frame->increment_arg();
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|
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// now i_arg is 0 -> evaluate that argument
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|
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this->expr_ = apply_expr->arg(i_arg);
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this->pc_ = VsmInstr::c_eval;
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|
//this->cont_ = VsmInstra::c_evalargs; // redundant, since preserved
|
|
|
|
return;
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|
} else {
|
|
// error - function position must deliver something with AProcedure?
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|
// or DClosure, but we'll get to that.
|
|
|
|
log.retroactively_enable();
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|
log("expected procedure in function position -> terminate");
|
|
|
|
assert(false);
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|
}
|
|
} else {
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|
DArray * args = apply_frame->args();
|
|
|
|
log && log(xtag("i_arg", i_arg), xtag("n_arg", args->size()), xtag("cap", args->capacity()));
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|
|
|
args->push_back(value);
|
|
|
|
i_arg = evalargs_frame->increment_arg();
|
|
|
|
if (i_arg == static_cast<int32_t>(apply_expr->n_args())) {
|
|
// all apply-arguments have been evaluated
|
|
// -> done with VsmEvalArgsFrame
|
|
//
|
|
|
|
this->fn_ = apply_frame->fn();
|
|
this->args_ = apply_frame->args();
|
|
|
|
this->stack_ = apply_frame->parent();
|
|
this->pc_ = VsmInstr::c_apply;
|
|
this->cont_ = apply_frame->cont();
|
|
|
|
return;
|
|
|
|
} else {
|
|
this->expr_ = apply_expr->arg(i_arg);
|
|
this->pc_ = VsmInstr::c_eval;
|
|
//this->cont_ = VsmInstra::c_evalargs; // redundant, since preserved
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
// not implemented
|
|
assert(false);
|
|
}
|
|
|
|
void
|
|
VirtualSchematikaMachine::_do_apply_cont_op()
|
|
{
|
|
// see DVsmApplyClosureFrame
|
|
|
|
auto frame = obj<AGCObject,DVsmApplyClosureFrame>::from(stack_);
|
|
|
|
assert(frame);
|
|
|
|
this->stack_ = frame->parent();
|
|
this->local_env_ = frame->local_env();
|
|
this->pc_ = frame->cont();
|
|
}
|
|
|
|
void
|
|
VirtualSchematikaMachine::_do_ifelse_cont_op()
|
|
{
|
|
// pre: result of evaluating test condition in value_ register
|
|
|
|
auto frame = obj<AGCObject,DVsmIfElseContFrame>::from(stack_);
|
|
|
|
assert(frame);
|
|
assert(value_.is_value());
|
|
|
|
auto flag = obj<AGCObject,DBoolean>::from(*value_.value());
|
|
|
|
if (flag.data()) {
|
|
obj<AExpression> next_expr;
|
|
{
|
|
if (flag->value()) {
|
|
// proceed with if-branch
|
|
next_expr = frame->ifelse_expr()->when_true();
|
|
} else {
|
|
// proceed with else-branch
|
|
next_expr = frame->ifelse_expr()->when_false();
|
|
}
|
|
}
|
|
|
|
this->stack_ = frame->parent();
|
|
this->cont_ = frame->cont();
|
|
this->expr_ = next_expr;
|
|
this->pc_ = VsmInstr::c_eval;
|
|
} else {
|
|
auto error = DRuntimeError::make(mm_.to_op(),
|
|
"_do_ifelse_cont_op",
|
|
"expected boolean for test condition");
|
|
this->value_ = VsmResult(error);
|
|
|
|
// for now: halt VSM execution
|
|
// TODO: some combination of
|
|
// 1. emit stack trace
|
|
// 2. go to debugger
|
|
// 3. have every vsm instruction check inputs for errors
|
|
|
|
this->pc_ = VsmInstr::c_halt;
|
|
}
|
|
}
|
|
|
|
void
|
|
VirtualSchematikaMachine::_do_seq_cont_op()
|
|
{
|
|
auto frame = obj<AGCObject,DVsmSeqContFrame>::from(stack_);
|
|
|
|
assert(frame);
|
|
|
|
uint32_t i_seq = 1 + frame->i_seq();
|
|
|
|
auto seq_expr = frame->seq_expr();
|
|
|
|
assert(seq_expr);
|
|
|
|
if (i_seq == seq_expr->size()) {
|
|
/* done with sequence
|
|
* value of sequence-expr is the value of the last expression in that sequence,
|
|
* which is already in the value_ register
|
|
*/
|
|
|
|
this->stack_ = frame->parent();
|
|
this->pc_ = frame->cont();
|
|
return;
|
|
} else {
|
|
frame->incr_i_seq();
|
|
|
|
this->cont_ = VsmInstr::c_seq_cont;
|
|
this->expr_ = (*seq_expr)[i_seq];
|
|
this->pc_ = VsmInstr::c_eval;
|
|
return;
|
|
}
|
|
}
|
|
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|
|
|
|
/* end VirtualSchematikaMachine.hpp */
|