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Implemented visit_Return for freeing variables #2412

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Merged
merged 2 commits into from
Nov 9, 2023
Merged

Implemented visit_Return for freeing variables #2412

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a5c8ce1
Implemented visit_Return for freeing variables
anutosh491 Nov 9, 2023
7231fb0
Fixed cases for which basic_free_stack should be defined
anutosh491 Nov 9, 2023
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68 changes: 48 additions & 20 deletions src/libasr/pass/replace_symbolic.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -89,27 +89,29 @@ class ReplaceSymbolicVisitor : public PassUtils::PassVisitor<ReplaceSymbolicVisi
this->current_scope = current_scope_copy;

// freeing out variables
std::string new_name = "basic_free_stack";
ASR::symbol_t* basic_free_stack_sym = module_scope->get_symbol(new_name);
Vec<ASR::stmt_t*> func_body;
func_body.from_pointer_n_copy(al, xx.m_body, xx.n_body);
if (!symbolic_vars_to_free.empty()) {
std::string new_name = "basic_free_stack";
ASR::symbol_t* basic_free_stack_sym = module_scope->get_symbol(new_name);
Vec<ASR::stmt_t*> func_body;
func_body.from_pointer_n_copy(al, xx.m_body, xx.n_body);

for (ASR::symbol_t* symbol : symbolic_vars_to_free) {
if (symbolic_vars_to_omit.find(symbol) != symbolic_vars_to_omit.end()) continue;
Vec<ASR::call_arg_t> call_args;
call_args.reserve(al, 1);
ASR::call_arg_t call_arg;
call_arg.loc = xx.base.base.loc;
call_arg.m_value = ASRUtils::EXPR(ASR::make_Var_t(al, xx.base.base.loc, symbol));
call_args.push_back(al, call_arg);
ASR::stmt_t* stmt = ASRUtils::STMT(ASR::make_SubroutineCall_t(al, xx.base.base.loc, basic_free_stack_sym,
basic_free_stack_sym, call_args.p, call_args.n, nullptr));
func_body.push_back(al, stmt);
}

for (ASR::symbol_t* symbol : symbolic_vars_to_free) {
if (symbolic_vars_to_omit.find(symbol) != symbolic_vars_to_omit.end()) continue;
Vec<ASR::call_arg_t> call_args;
call_args.reserve(al, 1);
ASR::call_arg_t call_arg;
call_arg.loc = xx.base.base.loc;
call_arg.m_value = ASRUtils::EXPR(ASR::make_Var_t(al, xx.base.base.loc, symbol));
call_args.push_back(al, call_arg);
ASR::stmt_t* stmt = ASRUtils::STMT(ASR::make_SubroutineCall_t(al, xx.base.base.loc, basic_free_stack_sym,
basic_free_stack_sym, call_args.p, call_args.n, nullptr));
func_body.push_back(al, stmt);
xx.n_body = func_body.size();
xx.m_body = func_body.p;
symbolic_vars_to_free.clear();
}

xx.n_body = func_body.size();
xx.m_body = func_body.p;
symbolic_vars_to_free.clear();
}

void visit_Variable(const ASR::Variable_t& x) {
Expand All @@ -121,7 +123,9 @@ class ReplaceSymbolicVisitor : public PassUtils::PassVisitor<ReplaceSymbolicVisi

ASR::ttype_t *type1 = ASRUtils::TYPE(ASR::make_CPtr_t(al, xx.base.base.loc));
xx.m_type = type1;
symbolic_vars_to_free.insert(ASR::down_cast<ASR::symbol_t>((ASR::asr_t*)&xx));
if (var_name != "_lpython_return_variable") {
symbolic_vars_to_free.insert(ASR::down_cast<ASR::symbol_t>((ASR::asr_t*)&xx));
}
if(xx.m_intent == ASR::intentType::In){
symbolic_vars_to_omit.insert(ASR::down_cast<ASR::symbol_t>((ASR::asr_t*)&xx));
}
Expand Down Expand Up @@ -1762,6 +1766,30 @@ class ReplaceSymbolicVisitor : public PassUtils::PassVisitor<ReplaceSymbolicVisi
}
}
}

void visit_Return(const ASR::Return_t &x) {
if (!symbolic_vars_to_free.empty()){
SymbolTable* module_scope = current_scope->parent;
// freeing out variables
std::string new_name = "basic_free_stack";
ASR::symbol_t* basic_free_stack_sym = module_scope->get_symbol(new_name);

for (ASR::symbol_t* symbol : symbolic_vars_to_free) {
if (symbolic_vars_to_omit.find(symbol) != symbolic_vars_to_omit.end()) continue;
Vec<ASR::call_arg_t> call_args;
call_args.reserve(al, 1);
ASR::call_arg_t call_arg;
call_arg.loc = x.base.base.loc;
call_arg.m_value = ASRUtils::EXPR(ASR::make_Var_t(al, x.base.base.loc, symbol));
call_args.push_back(al, call_arg);
ASR::stmt_t* stmt = ASRUtils::STMT(ASR::make_SubroutineCall_t(al, x.base.base.loc, basic_free_stack_sym,
basic_free_stack_sym, call_args.p, call_args.n, nullptr));
pass_result.push_back(al, stmt);
}
symbolic_vars_to_free.clear();
pass_result.push_back(al, ASRUtils::STMT(ASR::make_Return_t(al, x.base.base.loc)));
}
}
};

void pass_replace_symbolic(Allocator &al, ASR::TranslationUnit_t &unit,
Expand Down