444 lines
14 KiB
C++
444 lines
14 KiB
C++
/* @file define_xs.cpp */
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#include "define_xs.hpp"
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#include "expect_expr_xs.hpp"
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namespace xo {
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namespace scm {
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std::unique_ptr<define_xs>
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define_xs::def_0() {
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return std::make_unique<define_xs>(define_xs(DefineExprAccess::make_empty()));
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}
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define_xs::define_xs(rp<DefineExprAccess> def_expr)
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: exprstate(exprstatetype::defexpr),
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defxs_type_{defexprstatetype::def_0},
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def_expr_{std::move(def_expr)}
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{}
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bool
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define_xs::admits_symbol() const {
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switch (defxs_type_) {
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case defexprstatetype::def_0:
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case defexprstatetype::def_1:
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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return false;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return false;
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}
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return false;
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}
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bool
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define_xs::admits_colon() const {
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switch (defxs_type_) {
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case defexprstatetype::def_0:
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return false;
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case defexprstatetype::def_1:
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return true;
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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return false;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return false;
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}
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return false;
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}
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bool
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define_xs::admits_semicolon() const {
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switch (defxs_type_) {
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case defexprstatetype::def_0:
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case defexprstatetype::def_1:
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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return false;
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case defexprstatetype::def_5:
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return true;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return false;
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}
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return false;
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}
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bool
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define_xs::admits_singleassign() const {
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switch (defxs_type_) {
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/*
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* def foo = 1 ;
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* def foo : f64 = 1 ;
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* ^ ^ ^ ^ ^ ^ ^
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* | | | | | | (done)
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* | | | | | def_4:expect_rhs_expression
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* | | | | def_3
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* | | | def_2:expect_type
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* | | def_1
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* | def_0:expect_symbol
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* expect_toplevel_expression_sequence
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*
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* note that we skip from def_1 -> def_4 if '=' instead of ':'
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*/
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case defexprstatetype::def_0:
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return false;
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case defexprstatetype::def_1:
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return true;
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case defexprstatetype::def_2:
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return false;
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case defexprstatetype::def_3:
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return true;
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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return false;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return false;
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}
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return false;
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}
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bool
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define_xs::admits_leftparen() const {
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switch (defxs_type_) {
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case defexprstatetype::def_0:
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case defexprstatetype::def_1:
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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/* input like
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* def foo : f64 = (
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* ^ ^ ^ ^ ^
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* | | | | def_4
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* | | | def_3
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* | | def_2
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* | def_1
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* def_0
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*
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* not allowed or relies on pushing another state
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*/
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return false;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return false;
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}
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return false;
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}
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bool
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define_xs::admits_rightparen() const {
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switch (defxs_type_) {
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case defexprstatetype::def_0:
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case defexprstatetype::def_1:
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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return false;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return false;
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}
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return false;
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}
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void
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define_xs::on_expr(ref::brw<Expression> expr,
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exprstatestack * /* p_stack */,
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rp<Expression> * /* p_emit_expr */)
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{
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switch (this->defxs_type_) {
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case defexprstatetype::def_0:
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case defexprstatetype::def_1:
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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/* NOT IMPLEMENTED */
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assert(false);
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return;
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case defexprstatetype::def_4: {
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/* have all the ingredients to create an expression
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* representing a definition
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*
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* 1. if ir_type is a symbol, interpret as variable name.
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* Need to be able to locate variable by type
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* 2. if ir_type is an expression, adopt as rhs
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*/
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rp<Expression> rhs_value = expr.promote();
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if (this->cvt_expr_)
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this->cvt_expr_->assign_arg(rhs_value);
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else
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this->def_expr_->assign_rhs(rhs_value);;
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rp<Expression> def_expr = this->def_expr_;
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this->defxs_type_ = defexprstatetype::def_5;
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return;
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}
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case defexprstatetype::def_5:
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assert(false);
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return;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return;
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}
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}
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void
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define_xs::on_symbol(const std::string & symbol_name,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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switch (this->defxs_type_) {
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case defexprstatetype::def_0:
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this->defxs_type_ = defexprstatetype::def_1;
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this->def_expr_->assign_lhs_name(symbol_name);
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//this->def_lhs_symbol_ = symbol_name;
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return;
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case defexprstatetype::def_1:
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case defexprstatetype::def_2:
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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/* NOT IMPLEMENTED */
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assert(false);
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return;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return;
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}
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}
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void
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define_xs::on_typedescr(TypeDescr td,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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switch (this->defxs_type_) {
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case defexprstatetype::def_0:
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case defexprstatetype::def_1:
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/* NOT IMPLEMENTED (ill-formed program) */
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assert(false);
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return;
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case defexprstatetype::def_2:
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this->defxs_type_ = defexprstatetype::def_3;
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this->cvt_expr_ = ConvertExprAccess::make(td /*dest_type*/,
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nullptr /*source_expr*/);
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this->def_expr_->assign_rhs(this->cvt_expr_);
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//this->def_lhs_td_ = td;
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return;
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case defexprstatetype::def_3:
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case defexprstatetype::def_4:
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case defexprstatetype::def_5:
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/* NOT IMPLEMENTED */
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assert(false);
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return;
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case defexprstatetype::invalid:
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case defexprstatetype::n_defexprstatetype:
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/* unreachable */
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assert(false);
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return;
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}
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}
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void
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define_xs::on_colon_token(const token_type & /*tk*/,
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exprstatestack * p_stack)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_colon";
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/* lots of illegal states */
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if (!this->admits_colon())
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{
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throw std::runtime_error(tostr(self_name,
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": unexpected colon for parsing state",
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xtag("state", *this)));
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}
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if (this->defxs_type_ == defexprstatetype::def_1) {
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this->defxs_type_ = defexprstatetype::def_2;
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p_stack->push_exprstate(exprstate::expect_type());
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} else {
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assert(false);
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}
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}
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void
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define_xs::on_semicolon_token(const token_type & /*tk*/,
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exprstatestack * p_stack,
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rp<Expression> * p_emit_expr)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_semicolon";
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if (!this->admits_semicolon())
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{
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throw std::runtime_error(tostr(self_name,
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": unexpected semicolon for parsing state",
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xtag("state", *this)));
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}
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if (this->defxs_type_ == defexprstatetype::def_5) {
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rp<Expression> expr = this->def_expr_;
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std::unique_ptr<exprstate> self = p_stack->pop_exprstate();
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p_stack->top_exprstate().on_expr(expr,
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p_stack,
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p_emit_expr);
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} else {
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assert(false);
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}
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}
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void
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define_xs::on_singleassign_token(const token_type & tk,
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exprstatestack * p_stack)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_singleassign";
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if (!this->admits_singleassign()) {
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this->illegal_input_error(self_name, tk);
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}
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if ((this->defxs_type_ == defexprstatetype::def_1)
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|| (this->defxs_type_ == defexprstatetype::def_3))
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{
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this->defxs_type_ = defexprstatetype::def_4;
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p_stack->push_exprstate(expect_expr_xs::expect_rhs_expression());
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} else {
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assert(false);
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}
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}
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void
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define_xs::on_leftparen_token(const token_type & tk,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_leftparen";
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if (!this->admits_leftparen())
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{
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this->illegal_input_error(self_name, tk);
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}
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assert(false); /* inserting this during refactor...? */
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}
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void
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define_xs::on_rightparen_token(const token_type & tk,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_rightparen";
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if (!this->admits_rightparen())
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{
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this->illegal_input_error(self_name, tk);
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}
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assert(false); /* inserting this during refactor..? */
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}
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void
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define_xs::on_f64_token(const token_type & tk,
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exprstatestack * /*p_stack*/,
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rp<Expression> * /*p_emit_expr*/)
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag));
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constexpr const char * self_name = "exprstate::on_f64";
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this->illegal_input_error(self_name, tk);
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}
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void
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define_xs::print(std::ostream & os) const {
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os << "<define_xs"
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<< xtag("type", exs_type_);
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if (def_expr_)
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os << xtag("def_expr", def_expr_);
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if (cvt_expr_)
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os << xtag("cvt_expr", cvt_expr_);
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os << ">";
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}
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} /*namespace scm*/
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} /*namespace xo*/
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/* end define_xs.cpp */
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