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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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33
crypto/func/func.h
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@ -593,16 +593,19 @@ struct Op {
SymDef* _fun = nullptr)
: cl(_cl), flags(0), fun_ref(_fun), where(_where), left(std::move(_left)), right(std::move(_right)) {
}
bool disabled() const {
return flags & _Disabled;
}
bool enabled() const {
return !disabled();
}
void disable() {
flags |= _Disabled;
}
void flags_set_clear(int set, int clear);
bool disabled() const { return flags & _Disabled; }
void set_disabled() { flags |= _Disabled; }
void set_disabled(bool flag);
bool noreturn() const { return flags & _NoReturn; }
bool set_noreturn() { flags |= _NoReturn; return true; }
bool set_noreturn(bool flag);
bool impure() const { return flags & _Impure; }
void set_impure(const CodeBlob &code);
void set_impure(const CodeBlob &code, bool flag);
void show(std::ostream& os, const std::vector<TmpVar>& vars, std::string pfx = "", int mode = 0) const;
void show_var_list(std::ostream& os, const std::vector<var_idx_t>& idx_list, const std::vector<TmpVar>& vars) const;
void show_var_list(std::ostream& os, const std::vector<VarDescr>& list, const std::vector<TmpVar>& vars) const;
@ -618,17 +621,10 @@ struct Op {
bool set_var_info_except(VarDescrList&& new_var_info, const std::vector<var_idx_t>& var_list);
void prepare_args(VarDescrList values);
VarDescrList fwd_analyze(VarDescrList values);
bool set_noreturn(bool nr);
bool mark_noreturn();
bool noreturn() const {
return flags & _NoReturn;
}
bool is_empty() const {
return cl == _Nop && !next;
}
bool is_pure() const {
return !(flags & _Impure);
}
bool generate_code_step(Stack& stack);
void generate_code_all(Stack& stack);
Op& last() {
@ -689,7 +685,7 @@ typedef std::vector<FormalArg> FormalArgList;
struct AsmOpList;
struct CodeBlob {
enum { _AllowPostModification = 1, _ComputeAsmLtr = 2 };
enum { _AllowPostModification = 1, _ComputeAsmLtr = 2, _ForbidImpure = 4 };
int var_cnt, in_var_cnt, op_cnt;
TypeExpr* ret_type;
std::string name;
@ -733,7 +729,6 @@ struct CodeBlob {
pop_cur();
}
void simplify_var_types();
void flags_set_clear(int set, int clear);
void prune_unreachable_code();
void fwd_analyze();
void mark_noreturn();