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[FunC] Forbid impure operations inside pure functions

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In stdlib, all existing pure functions are asm-implemented.
But since we introduced a `pure` keyword applicable to user-defined functions,
we need to check that they won't have any side effects
(exceptions, globals modification, etc.)
This commit is contained in:
Aleksandr Kirsanov 2024-05-03 20:58:21 +03:00
parent 85c60d1263
commit ef5719d7e6
No known key found for this signature in database
GPG key ID: B758BBAA01FFB3D3
9 changed files with 181 additions and 51 deletions
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10
crypto/func/parse-func.cpp
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@ -1216,7 +1216,7 @@ blk_fl::val parse_stmt(Lexer& lex, CodeBlob& code) {
}
}
CodeBlob* parse_func_body(Lexer& lex, FormalArgList arg_list, TypeExpr* ret_type) {
CodeBlob* parse_func_body(Lexer& lex, FormalArgList arg_list, TypeExpr* ret_type, bool marked_as_pure) {
lex.expect('{');
CodeBlob* blob = new CodeBlob{ret_type};
if (pragma_allow_post_modification.enabled()) {
@ -1225,6 +1225,9 @@ CodeBlob* parse_func_body(Lexer& lex, FormalArgList arg_list, TypeExpr* ret_type
if (pragma_compute_asm_ltr.enabled()) {
blob->flags |= CodeBlob::_ComputeAsmLtr;
}
if (marked_as_pure) {
blob->flags |= CodeBlob::_ForbidImpure;
}
blob->import_params(std::move(arg_list));
blk_fl::val res = blk_fl::init;
bool warned = false;
@ -1604,7 +1607,10 @@ void parse_func_def(Lexer& lex) {
if (func_sym_code->code) {
lex.cur().error("redefinition of function `"s + func_name.str + "`");
}
CodeBlob* code = parse_func_body(lex, arg_list, ret_type);
if (marked_as_pure && ret_type->get_width() == 0) {
lex.cur().error("a pure function should return something, otherwise it will be optimized out anyway");
}
CodeBlob* code = parse_func_body(lex, arg_list, ret_type, marked_as_pure);
code->name = func_name.str;
code->loc = loc;
// code->print(std::cerr); // !!!DEBUG!!!