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[Tolk] Compilation pipeline, register global symbols in advance

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Since I've implemented AST, now I can drop forward declarations.
Instead, I traverse AST of all files and register global symbols
(functions, constants, global vars) as a separate step, in advance.

That's why, while converting AST to Expr/Op, all available symbols are
already registered.
This greatly simplifies "intermediate state" of yet unknown functions
and checking them afterward.

Redeclaration of local variables (inside the same scope)
is now also prohibited.
This commit is contained in:
tolk-vm 2024-10-31 11:04:58 +04:00
parent 80001d1756
commit 5a3e3595d6
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GPG key ID: 7905DD7FE0324B12
28 changed files with 1266 additions and 1134 deletions
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11
tolk/gen-abscode.cpp
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@ -185,10 +185,6 @@ int Expr::predefine_vars() {
case _Var:
if (!sym) {
tolk_assert(val < 0 && here.is_defined());
if (G.prohibited_var_names.count(G.symbols.get_name(~val))) {
throw ParseError{
here, PSTRING() << "symbol `" << G.symbols.get_name(~val) << "` cannot be redefined as a variable"};
}
sym = define_symbol(~val, false, here);
// std::cerr << "predefining variable " << symbols.get_name(~val) << std::endl;
if (!sym) {
@ -319,7 +315,13 @@ std::vector<var_idx_t> Expr::pre_compile(CodeBlob& code, std::vector<std::pair<S
SymDef* applied_sym = sym;
auto func = dynamic_cast<SymValFunc*>(applied_sym->value);
// replace `beginCell()` with `begin_cell()`
// todo it should be done at AST level, see comment above detect_if_function_just_wraps_another()
if (func && func->is_just_wrapper_for_another_f()) {
// todo currently, f is inlined only if anotherF is declared (and processed) before
if (!dynamic_cast<SymValCodeFunc*>(func)->code) { // if anotherF is processed after
func->flags |= SymValFunc::flagUsedAsNonCall;
res = pre_compile_tensor(args, code, lval_globs);
} else {
// body is { Op::_Import; Op::_Call; Op::_Return; }
const std::unique_ptr<Op>& op_call = dynamic_cast<SymValCodeFunc*>(func)->code->ops->next;
applied_sym = op_call->fun_ref;
@ -331,6 +333,7 @@ std::vector<var_idx_t> Expr::pre_compile(CodeBlob& code, std::vector<std::pair<S
for (var_idx_t right_idx : op_call->right) {
res.emplace_back(res_inner[right_idx]);
}
}
} else {
res = pre_compile_tensor(args, code, lval_globs);
}