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parse-func.cpp
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/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2020 Telegram Systems LLP
*/
#include "func.h"
#include "td/utils/crypto.h"
#include "common/refint.h"
#include <fstream>
namespace sym {
int compute_symbol_subclass(std::string str) {
using funC::IdSc;
if (str.size() < 2) {
return IdSc::undef;
} else if (str[0] == '.') {
return IdSc::dotid;
} else if (str[0] == '~') {
return IdSc::tildeid;
} else {
return IdSc::undef;
}
}
} // namespace sym
namespace funC {
using namespace std::literals::string_literals;
using src::Lexer;
using sym::symbols;
using td::Ref;
inline bool is_dot_ident(sym_idx_t idx) {
return symbols.get_subclass(idx) == IdSc::dotid;
}
inline bool is_tilde_ident(sym_idx_t idx) {
return symbols.get_subclass(idx) == IdSc::tildeid;
}
inline bool is_special_ident(sym_idx_t idx) {
return symbols.get_subclass(idx) != IdSc::undef;
}
/*
*
* PARSE SOURCE
*
*/
// TE ::= TA | TA -> TE
// TA ::= int | ... | cont | var | _ | () | ( TE { , TE } ) | [ TE { , TE } ]
TypeExpr* parse_type(Lexer& lex);
TypeExpr* parse_type1(Lexer& lex) {
switch (lex.tp()) {
case _Int:
lex.next();
return TypeExpr::new_atomic(_Int);
case _Cell:
lex.next();
return TypeExpr::new_atomic(_Cell);
case _Slice:
lex.next();
return TypeExpr::new_atomic(_Slice);
case _Builder:
lex.next();
return TypeExpr::new_atomic(_Builder);
case _Cont:
lex.next();
return TypeExpr::new_atomic(_Cont);
case _Tuple:
lex.next();
return TypeExpr::new_atomic(_Tuple);
case _Var:
case '_':
lex.next();
return TypeExpr::new_hole();
case _Ident: {
auto sym = sym::lookup_symbol(lex.cur().val);
if (sym && dynamic_cast<SymValType*>(sym->value)) {
auto val = dynamic_cast<SymValType*>(sym->value);
lex.next();
return val->get_type();
}
lex.cur().error_at("`", "` is not a type identifier");
}
}
int c;
if (lex.tp() == '[') {
lex.next();
c = ']';
} else {
lex.expect('(');
c = ')';
}
if (lex.tp() == c) {
lex.next();
return c == ')' ? TypeExpr::new_unit() : TypeExpr::new_tuple({});
}
auto t1 = parse_type(lex);
if (lex.tp() == ')') {
lex.expect(c);
return t1;
}
std::vector<TypeExpr*> tlist{1, t1};
while (lex.tp() == ',') {
lex.next();
tlist.push_back(parse_type(lex));
}
lex.expect(c);
return c == ')' ? TypeExpr::new_tensor(std::move(tlist)) : TypeExpr::new_tuple(std::move(tlist));
}
TypeExpr* parse_type(Lexer& lex) {
auto res = parse_type1(lex);
if (lex.tp() == _Mapsto) {
lex.next();
auto to = parse_type(lex);
return TypeExpr::new_map(res, to);
} else {
return res;
}
}
FormalArg parse_formal_arg(Lexer& lex, int fa_idx) {
TypeExpr* arg_type = 0;
SrcLocation loc = lex.cur().loc;
if (lex.tp() == '_') {
lex.next();
if (lex.tp() == ',' || lex.tp() == ')') {
return std::make_tuple(TypeExpr::new_hole(), (SymDef*)nullptr, loc);
}
arg_type = TypeExpr::new_hole();
loc = lex.cur().loc;
} else if (lex.tp() != _Ident) {
arg_type = parse_type(lex);
} else {
auto sym = sym::lookup_symbol(lex.cur().val);
if (sym && dynamic_cast<SymValType*>(sym->value)) {
auto val = dynamic_cast<SymValType*>(sym->value);
lex.next();
arg_type = val->get_type();
} else {
arg_type = TypeExpr::new_hole();
}
}
if (lex.tp() == '_' || lex.tp() == ',' || lex.tp() == ')') {
if (lex.tp() == '_') {
loc = lex.cur().loc;
lex.next();
}
return std::make_tuple(arg_type, (SymDef*)nullptr, loc);
}
if (lex.tp() != _Ident) {
lex.expect(_Ident, "formal parameter name");
}
loc = lex.cur().loc;
SymDef* new_sym_def = sym::define_symbol(lex.cur().val, true, loc);
if (!new_sym_def) {
lex.cur().error_at("cannot define symbol `", "`");
}
if (new_sym_def->value) {
lex.cur().error_at("redefined formal parameter `", "`");
}
new_sym_def->value = new SymVal{SymVal::_Param, fa_idx, arg_type};
lex.next();
return std::make_tuple(arg_type, new_sym_def, loc);
}
void parse_global_var_decl(Lexer& lex) {
TypeExpr* var_type = 0;
SrcLocation loc = lex.cur().loc;
if (lex.tp() == '_') {
lex.next();
var_type = TypeExpr::new_hole();
loc = lex.cur().loc;
} else if (lex.tp() != _Ident) {
var_type = parse_type(lex);
} else {
auto sym = sym::lookup_symbol(lex.cur().val);
if (sym && dynamic_cast<SymValType*>(sym->value)) {
auto val = dynamic_cast<SymValType*>(sym->value);
lex.next();
var_type = val->get_type();
} else {
var_type = TypeExpr::new_hole();
}
}
if (lex.tp() != _Ident) {
lex.expect(_Ident, "global variable name");
}
loc = lex.cur().loc;
SymDef* sym_def = sym::define_global_symbol(lex.cur().val, false, loc);
if (!sym_def) {
lex.cur().error_at("cannot define global symbol `", "`");
}
if (sym_def->value) {
auto val = dynamic_cast<SymValGlobVar*>(sym_def->value);
if (!val) {
lex.cur().error_at("symbol `", "` cannot be redefined as a global variable");
}
try {
unify(var_type, val->sym_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "cannot unify new type " << var_type << " of global variable `" << sym_def->name()
<< "` with its previous type " << val->sym_type << ": " << ue;
lex.cur().error(os.str());
}
} else {
sym_def->value = new SymValGlobVar{glob_var_cnt++, var_type};
glob_vars.push_back(sym_def);
}
lex.next();
}
FormalArgList parse_formal_args(Lexer& lex) {
FormalArgList args;
lex.expect('(', "formal argument list");
if (lex.tp() == ')') {
lex.next();
return args;
}
int fa_idx = 0;
args.push_back(parse_formal_arg(lex, fa_idx++));
while (lex.tp() == ',') {
lex.next();
args.push_back(parse_formal_arg(lex, fa_idx++));
}
lex.expect(')');
return args;
}
TypeExpr* extract_total_arg_type(const FormalArgList& arg_list) {
if (arg_list.empty()) {
return TypeExpr::new_unit();
}
if (arg_list.size() == 1) {
return std::get<0>(arg_list[0]);
}
std::vector<TypeExpr*> type_list;
for (auto& x : arg_list) {
type_list.push_back(std::get<0>(x));
}
return TypeExpr::new_tensor(std::move(type_list));
}
void parse_global_var_decls(Lexer& lex) {
lex.expect(_Global);
while (true) {
parse_global_var_decl(lex);
if (lex.tp() != ',') {
break;
}
lex.expect(',');
}
lex.expect(';');
}
SymValCodeFunc* make_new_glob_func(SymDef* func_sym, TypeExpr* func_type, bool impure = false) {
SymValCodeFunc* res = new SymValCodeFunc{glob_func_cnt, func_type, impure};
func_sym->value = res;
glob_func.push_back(func_sym);
glob_func_cnt++;
return res;
}
bool check_global_func(const Lexem& cur, sym_idx_t func_name = 0) {
if (!func_name) {
func_name = cur.val;
}
SymDef* def = sym::lookup_symbol(func_name);
if (!def) {
cur.loc.show_error(std::string{"undefined function `"} + symbols.get_name(func_name) +
"`, defining a global function of unknown type");
def = sym::define_global_symbol(func_name, 0, cur.loc);
assert(def && "cannot define global function");
++undef_func_cnt;
make_new_glob_func(def, TypeExpr::new_hole()); // was: ... ::new_func()
return true;
}
SymVal* val = dynamic_cast<SymVal*>(def->value);
if (!val) {
cur.error(std::string{"symbol `"} + symbols.get_name(func_name) + "` has no value and no type");
return false;
} else if (!val->get_type()) {
cur.error(std::string{"symbol `"} + symbols.get_name(func_name) + "` has no type, possibly not a function");
return false;
} else {
return true;
}
}
Expr* make_func_apply(Expr* fun, Expr* x) {
Expr* res;
if (fun->cls == Expr::_Glob) {
if (x->cls == Expr::_Tensor) {
res = new Expr{Expr::_Apply, fun->sym, x->args};
} else {
res = new Expr{Expr::_Apply, fun->sym, {x}};
}
res->flags = Expr::_IsRvalue | (fun->flags & Expr::_IsImpure);
} else {
res = new Expr{Expr::_VarApply, {fun, x}};
res->flags = Expr::_IsRvalue;
}
return res;
}
Expr* parse_expr(Lexer& lex, CodeBlob& code, bool nv = false);
// parse ( E { , E } ) | () | [ E { , E } ] | [] | id | num | _
Expr* parse_expr100(Lexer& lex, CodeBlob& code, bool nv) {
if (lex.tp() == '(' || lex.tp() == '[') {
bool tf = (lex.tp() == '[');
int clbr = (tf ? ']' : ')');
SrcLocation loc{lex.cur().loc};
lex.next();
if (lex.tp() == clbr) {
lex.next();
Expr* res = new Expr{Expr::_Tensor, {}};
res->flags = Expr::_IsRvalue;
res->here = loc;
res->e_type = TypeExpr::new_unit();
if (tf) {
res = new Expr{Expr::_MkTuple, {res}};
res->flags = Expr::_IsRvalue;
res->here = loc;
res->e_type = TypeExpr::new_tuple(res->args.at(0)->e_type);
}
return res;
}
Expr* res = parse_expr(lex, code, nv);
if (lex.tp() == ')') {
lex.expect(clbr);
return res;
}
std::vector<TypeExpr*> type_list;
type_list.push_back(res->e_type);
int f = res->flags;
res = new Expr{Expr::_Tensor, {res}};
while (lex.tp() == ',') {
lex.next();
auto x = parse_expr(lex, code, nv);
res->pb_arg(x);
if ((f ^ x->flags) & Expr::_IsType) {
lex.cur().error("mixing type and non-type expressions inside the same tuple");
}
f &= x->flags;
type_list.push_back(x->e_type);
}
res->here = loc;
res->flags = f;
res->e_type = TypeExpr::new_tensor(std::move(type_list), !tf);
if (tf) {
res = new Expr{Expr::_MkTuple, {res}};
res->flags = f;
res->here = loc;
res->e_type = TypeExpr::new_tuple(res->args.at(0)->e_type);
}
lex.expect(clbr);
return res;
}
int t = lex.tp();
if (t == Lexem::Number) {
Expr* res = new Expr{Expr::_Const, lex.cur().loc};
res->flags = Expr::_IsRvalue;
res->intval = td::string_to_int256(lex.cur().str);
if (res->intval.is_null()) {
lex.cur().error_at("invalid integer constant `", "`");
}
res->e_type = TypeExpr::new_atomic(_Int);
lex.next();
return res;
}
if (t == '_') {
Expr* res = new Expr{Expr::_Hole, lex.cur().loc};
res->val = -1;
res->flags = (Expr::_IsLvalue | Expr::_IsHole | Expr::_IsNewVar);
res->e_type = TypeExpr::new_hole();
lex.next();
return res;
}
if (t == _Var) {
Expr* res = new Expr{Expr::_Type, lex.cur().loc};
res->flags = Expr::_IsType;
res->e_type = TypeExpr::new_hole();
lex.next();
return res;
}
if (t == _Int || t == _Cell || t == _Slice || t == _Builder || t == _Cont || t == _Type || t == _Tuple) {
Expr* res = new Expr{Expr::_Type, lex.cur().loc};
res->flags = Expr::_IsType;
res->e_type = TypeExpr::new_atomic(t);
lex.next();
return res;
}
if (t == _Ident) {
auto sym = sym::lookup_symbol(lex.cur().val);
if (sym && dynamic_cast<SymValType*>(sym->value)) {
auto val = dynamic_cast<SymValType*>(sym->value);
Expr* res = new Expr{Expr::_Type, lex.cur().loc};
res->flags = Expr::_IsType;
res->e_type = val->get_type();
lex.next();
return res;
}
if (sym && dynamic_cast<SymValGlobVar*>(sym->value)) {
auto val = dynamic_cast<SymValGlobVar*>(sym->value);
Expr* res = new Expr{Expr::_GlobVar, lex.cur().loc};
res->e_type = val->get_type();
res->sym = sym;
res->flags = Expr::_IsLvalue | Expr::_IsRvalue | Expr::_IsImpure;
lex.next();
return res;
}
bool auto_apply = false;
Expr* res = new Expr{Expr::_Var, lex.cur().loc};
if (nv) {
res->val = ~lex.cur().val;
res->e_type = TypeExpr::new_hole();
res->flags = Expr::_IsLvalue | Expr::_IsNewVar;
// std::cerr << "defined new variable " << lex.cur().str << " : " << res->e_type << std::endl;
} else {
if (!sym) {
check_global_func(lex.cur());
sym = sym::lookup_symbol(lex.cur().val);
}
res->sym = sym;
SymVal* val = nullptr;
if (sym) {
val = dynamic_cast<SymVal*>(sym->value);
}
if (!val) {
lex.cur().error_at("undefined identifier `", "`");
} else if (val->type == SymVal::_Func) {
res->e_type = val->get_type();
res->cls = Expr::_Glob;
auto_apply = val->auto_apply;
} else if (val->idx < 0) {
lex.cur().error_at("accessing variable `", "` being defined");
} else {
res->val = val->idx;
res->e_type = val->get_type();
// std::cerr << "accessing variable " << lex.cur().str << " : " << res->e_type << std::endl;
}
// std::cerr << "accessing symbol " << lex.cur().str << " : " << res->e_type << (val->impure ? " (impure)" : " (pure)") << std::endl;
res->flags = Expr::_IsLvalue | Expr::_IsRvalue | (val->impure ? Expr::_IsImpure : 0);
}
if (auto_apply) {
int impure = res->flags & Expr::_IsImpure;
delete res;
res = new Expr{Expr::_Apply, sym, {}};
res->flags = Expr::_IsRvalue | impure;
}
res->deduce_type(lex.cur());
lex.next();
return res;
}
lex.expect(Lexem::Ident);
return nullptr;
}
// parse E { E }
Expr* parse_expr90(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res = parse_expr100(lex, code, nv);
while (lex.tp() == '(' || lex.tp() == '[' || (lex.tp() == _Ident && !is_special_ident(lex.cur().val))) {
if (res->is_type()) {
Expr* x = parse_expr100(lex, code, true);
x->chk_lvalue(lex.cur()); // chk_lrvalue() ?
TypeExpr* tp = res->e_type;
delete res;
res = new Expr{Expr::_TypeApply, {x}};
res->e_type = tp;
res->here = lex.cur().loc;
try {
unify(res->e_type, x->e_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "cannot transform expression of type " << x->e_type << " to explicitly requested type " << res->e_type
<< ": " << ue;
lex.cur().error(os.str());
}
res->flags = x->flags;
} else {
Expr* x = parse_expr100(lex, code, false);
x->chk_rvalue(lex.cur());
res = make_func_apply(res, x);
res->here = lex.cur().loc;
res->deduce_type(lex.cur());
}
}
return res;
}
// parse E { .method E | ~method E }
Expr* parse_expr80(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res = parse_expr90(lex, code, nv);
while (lex.tp() == _Ident && is_special_ident(lex.cur().val)) {
auto modify = is_tilde_ident(lex.cur().val);
auto obj = res;
if (modify) {
obj->chk_lvalue(lex.cur());
} else {
obj->chk_rvalue(lex.cur());
}
auto loc = lex.cur().loc;
auto name = lex.cur().val;
auto sym = sym::lookup_symbol(name);
if (!sym || !dynamic_cast<SymValFunc*>(sym->value)) {
auto name1 = symbols.lookup(lex.cur().str.substr(1));
if (name1) {
auto sym1 = sym::lookup_symbol(name1);
if (sym1 && dynamic_cast<SymValFunc*>(sym1->value)) {
name = name1;
sym = sym1;
}
}
}
check_global_func(lex.cur(), name);
if (verbosity >= 2) {
std::cerr << "using symbol `" << symbols.get_name(name) << "` for method call of " << lex.cur().str << std::endl;
}
sym = sym::lookup_symbol(name);
SymValFunc* val = sym ? dynamic_cast<SymValFunc*>(sym->value) : nullptr;
if (!val) {
lex.cur().error_at("undefined method identifier `", "`");
}
lex.next();
auto x = parse_expr100(lex, code, false);
x->chk_rvalue(lex.cur());
if (x->cls == Expr::_Tensor) {
res = new Expr{Expr::_Apply, name, {obj}};
res->args.insert(res->args.end(), x->args.begin(), x->args.end());
} else {
res = new Expr{Expr::_Apply, name, {obj, x}};
}
res->here = loc;
res->flags = Expr::_IsRvalue | (val->impure ? Expr::_IsImpure : 0);
res->deduce_type(lex.cur());
if (modify) {
auto tmp = res;
res = new Expr{Expr::_LetFirst, {obj->copy(), tmp}};
res->here = loc;
res->flags = tmp->flags;
res->set_val(name);
res->deduce_type(lex.cur());
}
}
return res;
}
// parse [ ~ ] E
Expr* parse_expr75(Lexer& lex, CodeBlob& code, bool nv) {
if (lex.tp() == '~') {
sym_idx_t name = symbols.lookup_add("~_");
check_global_func(lex.cur(), name);
SrcLocation loc{lex.cur().loc};
lex.next();
auto x = parse_expr80(lex, code, false);
x->chk_rvalue(lex.cur());
auto res = new Expr{Expr::_Apply, name, {x}};
res->here = loc;
res->set_val('~');
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
return res;
} else {
return parse_expr80(lex, code, nv);
}
}
// parse E { (* | / | % | /% ) E }
Expr* parse_expr30(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res = parse_expr75(lex, code, nv);
while (lex.tp() == '*' || lex.tp() == '/' || lex.tp() == '%' || lex.tp() == _DivMod || lex.tp() == _DivC ||
lex.tp() == _DivR || lex.tp() == _ModC || lex.tp() == _ModR || lex.tp() == '&') {
res->chk_rvalue(lex.cur());
int t = lex.tp();
sym_idx_t name = symbols.lookup_add(std::string{"_"} + lex.cur().str + "_");
SrcLocation loc{lex.cur().loc};
check_global_func(lex.cur(), name);
lex.next();
auto x = parse_expr75(lex, code, false);
x->chk_rvalue(lex.cur());
res = new Expr{Expr::_Apply, name, {res, x}};
res->here = loc;
res->set_val(t);
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
}
return res;
}
// parse [-] E { (+ | - | `|` | ^) E }
Expr* parse_expr20(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res;
int t = lex.tp();
if (t == '-') {
sym_idx_t name = symbols.lookup_add("-_");
check_global_func(lex.cur(), name);
SrcLocation loc{lex.cur().loc};
lex.next();
auto x = parse_expr30(lex, code, false);
x->chk_rvalue(lex.cur());
res = new Expr{Expr::_Apply, name, {x}};
res->here = loc;
res->set_val(t);
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
} else {
res = parse_expr30(lex, code, nv);
}
while (lex.tp() == '-' || lex.tp() == '+' || lex.tp() == '|' || lex.tp() == '^') {
res->chk_rvalue(lex.cur());
t = lex.tp();
sym_idx_t name = symbols.lookup_add(std::string{"_"} + lex.cur().str + "_");
check_global_func(lex.cur(), name);
SrcLocation loc{lex.cur().loc};
lex.next();
auto x = parse_expr30(lex, code, false);
x->chk_rvalue(lex.cur());
res = new Expr{Expr::_Apply, name, {res, x}};
res->here = loc;
res->set_val(t);
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
}
return res;
}
// parse E { ( << | >> | >>~ | >>^ ) E }
Expr* parse_expr17(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res = parse_expr20(lex, code, nv);
while (lex.tp() == _Lshift || lex.tp() == _Rshift || lex.tp() == _RshiftC || lex.tp() == _RshiftR) {
res->chk_rvalue(lex.cur());
int t = lex.tp();
sym_idx_t name = symbols.lookup_add(std::string{"_"} + lex.cur().str + "_");
check_global_func(lex.cur(), name);
SrcLocation loc{lex.cur().loc};
lex.next();
auto x = parse_expr20(lex, code, false);
x->chk_rvalue(lex.cur());
res = new Expr{Expr::_Apply, name, {res, x}};
res->here = loc;
res->set_val(t);
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
}
return res;
}
// parse E [ (== | < | > | <= | >= | != | <=> ) E ]
Expr* parse_expr15(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res = parse_expr17(lex, code, nv);
if (lex.tp() == _Eq || lex.tp() == '<' || lex.tp() == '>' || lex.tp() == _Leq || lex.tp() == _Geq ||
lex.tp() == _Neq || lex.tp() == _Spaceship) {
res->chk_rvalue(lex.cur());
int t = lex.tp();
sym_idx_t name = symbols.lookup_add(std::string{"_"} + lex.cur().str + "_");
check_global_func(lex.cur(), name);
SrcLocation loc{lex.cur().loc};
lex.next();
auto x = parse_expr17(lex, code, false);
x->chk_rvalue(lex.cur());
res = new Expr{Expr::_Apply, name, {res, x}};
res->here = loc;
res->set_val(t);
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
}
return res;
}
// parse E [ ? E : E ]
Expr* parse_expr13(Lexer& lex, CodeBlob& code, bool nv) {
Expr* res = parse_expr15(lex, code, nv);
if (lex.tp() == '?') {
res->chk_rvalue(lex.cur());
SrcLocation loc{lex.cur().loc};
lex.next();
auto x = parse_expr(lex, code, false);
x->chk_rvalue(lex.cur());
lex.expect(':');
auto y = parse_expr13(lex, code, false);
y->chk_rvalue(lex.cur());
res = new Expr{Expr::_CondExpr, {res, x, y}};
res->here = loc;
res->flags = Expr::_IsRvalue;
res->deduce_type(lex.cur());
}
return res;
}
// parse LE1 (= | += | -= | ... ) E2
Expr* parse_expr10(Lexer& lex, CodeBlob& code, bool nv) {
auto x = parse_expr13(lex, code, nv);
int t = lex.tp();
if (t == _PlusLet || t == _MinusLet || t == _TimesLet || t == _DivLet || t == _DivRLet || t == _DivCLet ||
t == _ModLet || t == _ModCLet || t == _ModRLet || t == _LshiftLet || t == _RshiftLet || t == _RshiftCLet ||
t == _RshiftRLet || t == _AndLet || t == _OrLet || t == _XorLet) {
x->chk_lvalue(lex.cur());
x->chk_rvalue(lex.cur());
sym_idx_t name = symbols.lookup_add(std::string{"^_"} + lex.cur().str + "_");
check_global_func(lex.cur(), name);
SrcLocation loc{lex.cur().loc};
lex.next();
auto y = parse_expr10(lex, code, false);
y->chk_rvalue(lex.cur());
Expr* z = new Expr{Expr::_Apply, name, {x, y}};
z->here = loc;
z->set_val(t);
z->flags = Expr::_IsRvalue;
z->deduce_type(lex.cur());
Expr* res = new Expr{Expr::_Letop, {x->copy(), z}};
res->here = loc;
res->flags = (x->flags & ~Expr::_IsType) | Expr::_IsRvalue;
res->set_val(t);
res->deduce_type(lex.cur());
return res;
} else if (t == '=') {
x->chk_lvalue(lex.cur());
SrcLocation loc{lex.cur().loc};
lex.next();
auto y = parse_expr10(lex, code, false);
y->chk_rvalue(lex.cur());
x->predefine_vars();
x->define_new_vars(code);
Expr* res = new Expr{Expr::_Letop, {x, y}};
res->here = loc;
res->flags = (x->flags & ~Expr::_IsType) | Expr::_IsRvalue;
res->set_val(t);
res->deduce_type(lex.cur());
return res;
} else {
return x;
}
}
Expr* parse_expr(Lexer& lex, CodeBlob& code, bool nv) {
return parse_expr10(lex, code, nv);
}
namespace blk_fl {
enum { end = 1, ret = 2, empty = 4 };
typedef int val;
constexpr val init = end | empty;
void combine(val& x, const val y) {
x |= y & ret;
x &= y | ~(end | empty);
}
void combine_parallel(val& x, const val y) {
x &= y | ~(ret | empty);
x |= y & end;
}
} // namespace blk_fl
blk_fl::val parse_return_stmt(Lexer& lex, CodeBlob& code) {
auto expr = parse_expr(lex, code);
expr->chk_rvalue(lex.cur());
try {
// std::cerr << "in return: ";
unify(expr->e_type, code.ret_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "previous function return type " << code.ret_type
<< " cannot be unified with return statement expression type " << expr->e_type << ": " << ue;
lex.cur().error(os.str());
}
std::vector<var_idx_t> tmp_vars = expr->pre_compile(code);
code.emplace_back(lex.cur().loc, Op::_Return, std::move(tmp_vars));
lex.expect(';');
return blk_fl::ret;
}
blk_fl::val parse_implicit_ret_stmt(Lexer& lex, CodeBlob& code) {
auto ret_type = TypeExpr::new_unit();
try {
// std::cerr << "in implicit return: ";
unify(ret_type, code.ret_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "previous function return type " << code.ret_type
<< " cannot be unified with implicit end-of-block return type " << ret_type << ": " << ue;
lex.cur().error(os.str());
}
code.emplace_back(lex.cur().loc, Op::_Return);
return blk_fl::ret;
}
blk_fl::val parse_stmt(Lexer& lex, CodeBlob& code);
blk_fl::val parse_block_stmt(Lexer& lex, CodeBlob& code, bool no_new_scope = false) {
lex.expect('{');
if (!no_new_scope) {
sym::open_scope(lex);
}
blk_fl::val res = blk_fl::init;
bool warned = false;
while (lex.tp() != '}') {
if (!(res & blk_fl::end) && !warned) {
lex.cur().loc.show_warning("unreachable code");
warned = true;
}
blk_fl::combine(res, parse_stmt(lex, code));
}
if (!no_new_scope) {
sym::close_scope(lex);
}
lex.expect('}');
return res;
}
blk_fl::val parse_repeat_stmt(Lexer& lex, CodeBlob& code) {
SrcLocation loc{lex.cur().loc};
lex.expect(_Repeat);
auto expr = parse_expr(lex, code);
expr->chk_rvalue(lex.cur());
auto cnt_type = TypeExpr::new_atomic(_Int);
try {
unify(expr->e_type, cnt_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "repeat count value of type " << expr->e_type << " is not an integer: " << ue;
lex.cur().error(os.str());
}
std::vector<var_idx_t> tmp_vars = expr->pre_compile(code);
if (tmp_vars.size() != 1) {
lex.cur().error("repeat count value is not a singleton");
}
Op& repeat_op = code.emplace_back(loc, Op::_Repeat, tmp_vars);
code.push_set_cur(repeat_op.block0);
blk_fl::val res = parse_block_stmt(lex, code);
code.close_pop_cur(lex.cur().loc);
return res | blk_fl::end;
}
blk_fl::val parse_while_stmt(Lexer& lex, CodeBlob& code) {
SrcLocation loc{lex.cur().loc};
lex.expect(_While);
auto expr = parse_expr(lex, code);
expr->chk_rvalue(lex.cur());
auto cnt_type = TypeExpr::new_atomic(_Int);
try {
unify(expr->e_type, cnt_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "while condition value of type " << expr->e_type << " is not an integer: " << ue;
lex.cur().error(os.str());
}
Op& while_op = code.emplace_back(loc, Op::_While);
code.push_set_cur(while_op.block0);
while_op.left = expr->pre_compile(code);
code.close_pop_cur(lex.cur().loc);
if (while_op.left.size() != 1) {
lex.cur().error("while condition value is not a singleton");
}
code.push_set_cur(while_op.block1);
blk_fl::val res1 = parse_block_stmt(lex, code);
code.close_pop_cur(lex.cur().loc);
return res1 | blk_fl::end;
}
blk_fl::val parse_do_stmt(Lexer& lex, CodeBlob& code) {
Op& while_op = code.emplace_back(lex.cur().loc, Op::_Until);
lex.expect(_Do);
code.push_set_cur(while_op.block0);
sym::open_scope(lex);
blk_fl::val res = parse_block_stmt(lex, code, true);
lex.expect(_Until);
auto expr = parse_expr(lex, code);
expr->chk_rvalue(lex.cur());
sym::close_scope(lex);
auto cnt_type = TypeExpr::new_atomic(_Int);
try {
unify(expr->e_type, cnt_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "`until` condition value of type " << expr->e_type << " is not an integer: " << ue;
lex.cur().error(os.str());
}
while_op.left = expr->pre_compile(code);
code.close_pop_cur(lex.cur().loc);
if (while_op.left.size() != 1) {
lex.cur().error("`until` condition value is not a singleton");
}
return res & ~blk_fl::empty;
}
blk_fl::val parse_if_stmt(Lexer& lex, CodeBlob& code, int first_lex = _If) {
SrcLocation loc{lex.cur().loc};
lex.expect(first_lex);
auto expr = parse_expr(lex, code);
expr->chk_rvalue(lex.cur());
auto flag_type = TypeExpr::new_atomic(_Int);
try {
unify(expr->e_type, flag_type);
} catch (UnifyError& ue) {
std::ostringstream os;
os << "`if` condition value of type " << expr->e_type << " is not an integer: " << ue;
lex.cur().error(os.str());
}
std::vector<var_idx_t> tmp_vars = expr->pre_compile(code);
if (tmp_vars.size() != 1) {
lex.cur().error("condition value is not a singleton");
}
Op& if_op = code.emplace_back(loc, Op::_If, tmp_vars);
code.push_set_cur(if_op.block0);
blk_fl::val res1 = parse_block_stmt(lex, code);
blk_fl::val res2 = blk_fl::init;
code.close_pop_cur(lex.cur().loc);
if (lex.tp() == _Else) {
lex.expect(_Else);
code.push_set_cur(if_op.block1);
res2 = parse_block_stmt(lex, code);
code.close_pop_cur(lex.cur().loc);
} else if (lex.tp() == _Elseif || lex.tp() == _Elseifnot) {
code.push_set_cur(if_op.block1);
res2 = parse_if_stmt(lex, code, lex.tp());
code.close_pop_cur(lex.cur().loc);
} else {
if_op.block1 = std::make_unique<Op>(lex.cur().loc, Op::_Nop);
}
if (first_lex == _Ifnot || first_lex == _Elseifnot) {
std::swap(if_op.block0, if_op.block1);
}
blk_fl::combine_parallel(res1, res2);
return res1;
}
blk_fl::val parse_stmt(Lexer& lex, CodeBlob& code) {
switch (lex.tp()) {
case _Return: {
lex.next();
return parse_return_stmt(lex, code);
}
case '{': {
return parse_block_stmt(lex, code);
}
case ';': {
lex.next();
return blk_fl::init;
}
case _Repeat:
return parse_repeat_stmt(lex, code);
case _If:
case _Ifnot:
return parse_if_stmt(lex, code, lex.tp());
case _Do:
return parse_do_stmt(lex, code);
case _While:
return parse_while_stmt(lex, code);
default: {
auto expr = parse_expr(lex, code);
expr->chk_rvalue(lex.cur());
expr->pre_compile(code);
lex.expect(';');
return blk_fl::end;
}
}
}
CodeBlob* parse_func_body(Lexer& lex, FormalArgList arg_list, TypeExpr* ret_type) {
lex.expect('{');
CodeBlob* blob = new CodeBlob{ret_type};
blob->import_params(std::move(arg_list));
blk_fl::val res = blk_fl::init;
bool warned = false;
while (lex.tp() != '}') {
if (!(res & blk_fl::end) && !warned) {
lex.cur().loc.show_warning("unreachable code");
warned = true;
}
blk_fl::combine(res, parse_stmt(lex, *blob));
}
if (res & blk_fl::end) {
parse_implicit_ret_stmt(lex, *blob);
}
blob->close_blk(lex.cur().loc);
lex.expect('}');
return blob;
}
SymValAsmFunc* parse_asm_func_body(Lexer& lex, TypeExpr* func_type, const FormalArgList& arg_list, TypeExpr* ret_type,
bool impure = false) {