mirror of
https://github.com/ton-blockchain/ton
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d110022731
Unary logical NOT was already implemented earlier. Logical AND OR are expressed via conditional expression: * a && b -> a ? (b != 0) : 0 * a || b -> a ? 1 : (b != 0) They work as expected in any expressions. For instance, having `cond && f()`, f is called only if cond is true. For primitive cases, like `a > 0 && b > 0`, Fift code is not optimal, it could potentially be without IFs. These are moments of future optimizations. For now, it's more than enough.
114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "src-file.h"
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#include "type-expr.h"
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#include <functional>
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#include <memory>
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namespace tolk {
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typedef int var_idx_t;
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typedef int sym_idx_t;
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enum class SymValKind { _Var, _Func, _GlobVar, _Const };
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struct SymValBase {
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SymValKind kind;
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int idx;
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TypeExpr* sym_type;
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#ifdef TOLK_DEBUG
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std::string sym_name; // seeing symbol name in debugger makes it much easier to delve into Tolk sources
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#endif
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SymValBase(SymValKind kind, int idx, TypeExpr* sym_type) : kind(kind), idx(idx), sym_type(sym_type) {
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}
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virtual ~SymValBase() = default;
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TypeExpr* get_type() const {
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return sym_type;
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}
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};
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struct Symbol {
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std::string str;
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sym_idx_t idx;
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Symbol(std::string str, sym_idx_t idx) : str(std::move(str)), idx(idx) {}
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static std::string unknown_symbol_name(sym_idx_t i);
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};
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class SymTable {
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public:
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static constexpr int SIZE_PRIME = 100003;
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private:
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sym_idx_t def_sym{0};
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std::unique_ptr<Symbol> sym[SIZE_PRIME + 1];
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sym_idx_t gen_lookup(std::string_view str, int mode = 0, sym_idx_t idx = 0);
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public:
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static constexpr sym_idx_t not_found = 0;
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sym_idx_t lookup(std::string_view str) {
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return gen_lookup(str, 0);
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}
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sym_idx_t lookup_add(std::string_view str) {
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return gen_lookup(str, 1);
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}
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Symbol* operator[](sym_idx_t i) const {
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return sym[i].get();
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}
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std::string get_name(sym_idx_t i) const {
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return sym[i] ? sym[i]->str : Symbol::unknown_symbol_name(i);
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}
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};
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struct SymTableOverflow {
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int sym_def;
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explicit SymTableOverflow(int x) : sym_def(x) {
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}
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};
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struct SymDef {
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int level;
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sym_idx_t sym_idx;
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SymValBase* value;
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SrcLocation loc;
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#ifdef TOLK_DEBUG
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std::string sym_name;
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#endif
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SymDef(int lvl, sym_idx_t idx, SrcLocation _loc, SymValBase* val = nullptr)
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: level(lvl), sym_idx(idx), value(val), loc(_loc) {
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}
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std::string name() const;
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};
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void open_scope(SrcLocation loc);
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void close_scope();
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SymDef* lookup_symbol(sym_idx_t idx);
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SymDef* define_global_symbol(sym_idx_t name_idx, SrcLocation loc = {});
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SymDef* define_parameter(sym_idx_t name_idx, SrcLocation loc);
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SymDef* define_symbol(sym_idx_t name_idx, bool force_new, SrcLocation loc);
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} // namespace tolk
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