forked from xxq250/Nasal-Interpreter
Valk Richard Li
737 lines
20 KiB
C++
737 lines
20 KiB
C++
#ifndef __NASAL_GC_H__
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#define __NASAL_GC_H__
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enum runtime_scalar_type
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{
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vm_nil=0,
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vm_number,
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vm_string,
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vm_closure,
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vm_function,
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vm_vector,
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vm_hash
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};
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/*
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nasal_number: basic type(double)
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nasal_string: basic type(std::string)
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nasal_vector: elems[i] -> address in memory -> value address in gc
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nasal_hash: elems[key] -> address in memory -> value address in gc
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nasal_function: closure -> value address in gc(type: nasal_closure)
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nasal_closure: std::list<std::map<std::string,int>> -> std::map<std::string,int> -> (int) -> address in memory -> value address in gc
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*/
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class nasal_virtual_machine;
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class nasal_vector;
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class nasal_hash;
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class nasal_function;
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class nasal_closure;
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class nasal_scalar;
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class nasal_vector
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{
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private:
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// this int points to the space in nasal_vm::memory_manager_memory
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nasal_virtual_machine& vm;
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std::vector<nasal_scalar*> elems;
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public:
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nasal_vector(nasal_virtual_machine&);
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~nasal_vector();
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void add_elem(nasal_scalar*);
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nasal_scalar* del_elem();
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int size();
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nasal_scalar* operator[](const int);
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nasal_scalar* get_value_address(int);
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nasal_scalar** get_mem_address(int);
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void print();
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};
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class nasal_hash
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{
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private:
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// this int points to the space in nasal_vm::memory_manager_memory
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nasal_virtual_machine& vm;
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std::map<std::string,nasal_scalar*> elems;
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public:
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nasal_hash(nasal_virtual_machine&);
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~nasal_hash();
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void add_elem(std::string,nasal_scalar*);
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void del_elem(std::string);
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int size();
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nasal_scalar* get_special_para(std::string);
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nasal_scalar* get_value_address(std::string);
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nasal_scalar** get_mem_address(std::string);
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bool check_contain(std::string);
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nasal_scalar* get_keys();
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void print();
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};
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class nasal_function
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{
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private:
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nasal_virtual_machine& vm;
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int entry;
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nasal_scalar* closure_addr;
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std::vector<int> para_name;
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int dynamic_para_name;
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std::vector<nasal_scalar*> default_para_addr;
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public:
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nasal_function(nasal_virtual_machine&);
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~nasal_function();
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void set_entry(int);
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int get_entry();
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void add_para(int,nasal_scalar*,bool);
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std::vector<int>& get_para();
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int get_dynamic_para();
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std::vector<nasal_scalar*>& get_default();
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void set_closure_addr(nasal_scalar*);
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void set_new_closure();
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nasal_scalar* get_closure_addr();
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};
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class nasal_closure
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{
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private:
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// int in std::map<std::string,int> points to the space in nasal_vm::memory_manager_memory
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// and this memory_manager_memory space stores an address to garbage_collector_memory
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// and this address points to an nasal_hash
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nasal_virtual_machine& vm;
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std::list<std::map<int,nasal_scalar*> > elems;
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public:
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nasal_closure(nasal_virtual_machine&);
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~nasal_closure();
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void add_scope();
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void del_scope();
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void add_new_value(int,nasal_scalar*);
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nasal_scalar* get_value_address(int);
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nasal_scalar** get_mem_address(int);
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void set_closure(nasal_closure&);
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};
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class nasal_scalar
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{
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protected:
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int type;
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union
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{
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double num;
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std::string* str;
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nasal_vector* vec;
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nasal_hash* hash;
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nasal_function* func;
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nasal_closure* cls;
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}ptr;
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public:
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int ref_cnt;
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nasal_scalar();
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nasal_scalar(int,nasal_virtual_machine&);
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~nasal_scalar();
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void clear();
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void set_type(int,nasal_virtual_machine&);
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void set_number(double);
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void set_string(std::string);
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int get_type();
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double to_number();
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double get_number();
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std::string to_string();
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std::string get_string();
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nasal_vector& get_vector();
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nasal_hash& get_hash();
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nasal_function& get_func();
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nasal_closure& get_closure();
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};
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class nasal_virtual_machine
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{
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private:
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nasal_scalar error_returned_value;
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std::queue<nasal_scalar*> garbage_collector_free_space;
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std::vector<nasal_scalar*> garbage_collector_memory;
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public:
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~nasal_virtual_machine();
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void clear();
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void debug();
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nasal_scalar* gc_alloc(int);
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void add_reference(nasal_scalar*);
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void del_reference(nasal_scalar*);
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};
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/*functions of nasal_vector*/
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nasal_vector::nasal_vector(nasal_virtual_machine& nvm):vm(nvm)
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{
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return;
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}
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nasal_vector::~nasal_vector()
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{
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int size=elems.size();
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for(int i=0;i<size;++i)
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vm.del_reference(elems[i]);
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elems.clear();
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return;
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}
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void nasal_vector::add_elem(nasal_scalar* value_address)
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{
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elems.push_back(value_address);
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return;
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}
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nasal_scalar* nasal_vector::del_elem()
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{
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// pop back
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if(!elems.size())
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return NULL;
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nasal_scalar* ret=elems.back();
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elems.pop_back();
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return ret;
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}
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int nasal_vector::size()
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{
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return elems.size();
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}
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nasal_scalar* nasal_vector::operator[](const int index)
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{
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return elems[index];
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}
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nasal_scalar* nasal_vector::get_value_address(int index)
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{
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int vec_size=elems.size();
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if(index<-vec_size || index>=vec_size)
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{
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std::cout<<">> [vm] nasal_vector::get_value_address: index out of range: "<<index<<"\n";
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return NULL;
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}
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int idx[2]={index+vec_size,index};
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return elems[idx[index>=0]];
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}
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nasal_scalar** nasal_vector::get_mem_address(int index)
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{
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int vec_size=elems.size();
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if(index<-vec_size || index>=vec_size)
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{
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std::cout<<">> [vm] nasal_vector::get_mem_address: index out of range: "<<index<<"\n";
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return NULL;
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}
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int idx[2]={index+vec_size,index};
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return &elems[idx[index>=0]];
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}
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void nasal_vector::print()
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{
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int size=elems.size();
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std::cout<<"[";
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if(!size)
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std::cout<<"]";
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for(int i=0;i<size;++i)
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{
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nasal_scalar* tmp=elems[i];
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switch(tmp->get_type())
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{
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case vm_nil: std::cout<<"nil"; break;
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case vm_number: std::cout<<tmp->get_number(); break;
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case vm_string: std::cout<<tmp->get_string(); break;
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case vm_vector: tmp->get_vector().print(); break;
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case vm_hash: tmp->get_hash().print(); break;
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case vm_function: std::cout<<"func(...){...}"; break;
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}
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std::cout<<",]"[i==size-1];
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}
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return;
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}
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/*functions of nasal_hash*/
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nasal_hash::nasal_hash(nasal_virtual_machine& nvm):vm(nvm)
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{
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return;
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}
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nasal_hash::~nasal_hash()
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{
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for(std::map<std::string,nasal_scalar*>::iterator iter=elems.begin();iter!=elems.end();++iter)
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vm.del_reference(iter->second);
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elems.clear();
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return;
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}
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void nasal_hash::add_elem(std::string key,nasal_scalar* value_address)
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{
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if(elems.find(key)==elems.end())
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elems[key]=value_address;
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return;
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}
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void nasal_hash::del_elem(std::string key)
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{
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if(elems.find(key)!=elems.end())
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{
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vm.del_reference(elems[key]);
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elems.erase(key);
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}
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return;
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}
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int nasal_hash::size()
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{
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return elems.size();
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}
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nasal_scalar* nasal_hash::get_special_para(std::string key)
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{
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if(elems.find(key)!=elems.end())
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return elems[key];
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return NULL;
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}
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nasal_scalar* nasal_hash::get_value_address(std::string key)
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{
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nasal_scalar* ret_value_addr=NULL;
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if(elems.find(key)!=elems.end())
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return elems[key];
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else if(elems.find("parents")!=elems.end())
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{
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nasal_scalar* val_addr=elems["parents"];
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if(val_addr->get_type()==vm_vector)
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{
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nasal_vector& vec_ref=val_addr->get_vector();
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int size=vec_ref.size();
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for(int i=0;i<size;++i)
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{
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nasal_scalar* tmp_val_addr=vec_ref.get_value_address(i);
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if(tmp_val_addr->get_type()==vm_hash)
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ret_value_addr=tmp_val_addr->get_hash().get_value_address(key);
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if(ret_value_addr>=0)
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break;
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}
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}
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}
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return ret_value_addr;
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}
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nasal_scalar** nasal_hash::get_mem_address(std::string key)
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{
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nasal_scalar** mem_addr=NULL;
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if(elems.find(key)!=elems.end())
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return &elems[key];
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else if(elems.find("parents")!=elems.end())
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{
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nasal_scalar* val_addr=elems["parents"];
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if(val_addr->get_type()==vm_vector)
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{
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nasal_vector& vec_ref=val_addr->get_vector();
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int size=vec_ref.size();
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for(int i=0;i<size;++i)
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{
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nasal_scalar* tmp_val_addr=vec_ref.get_value_address(i);
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if(tmp_val_addr->get_type()==vm_hash)
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mem_addr=tmp_val_addr->get_hash().get_mem_address(key);
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if(mem_addr>0)
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break;
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}
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}
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}
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return mem_addr;
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}
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bool nasal_hash::check_contain(std::string key)
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{
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if(elems.find(key)!=elems.end())
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return true;
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if(elems.find("parents")!=elems.end())
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{
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bool result=false;
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nasal_scalar* val_addr=elems["parents"];
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if(val_addr->get_type()==vm_vector)
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{
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nasal_vector& vec_ref=val_addr->get_vector();
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int size=vec_ref.size();
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for(int i=0;i<size;++i)
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{
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nasal_scalar* tmp_val_addr=vec_ref.get_value_address(i);
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if(tmp_val_addr->get_type()==vm_hash)
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result=tmp_val_addr->get_hash().check_contain(key);
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if(result)
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break;
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}
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}
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return result;
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}
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return false;
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}
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nasal_scalar* nasal_hash::get_keys()
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{
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nasal_scalar* ret_addr=vm.gc_alloc(vm_vector);
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nasal_vector& ref_vec=ret_addr->get_vector();
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for(std::map<std::string,nasal_scalar*>::iterator iter=elems.begin();iter!=elems.end();++iter)
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{
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nasal_scalar* str_addr=vm.gc_alloc(vm_string);
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str_addr->set_string(iter->first);
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ref_vec.add_elem(str_addr);
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}
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return ret_addr;
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}
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void nasal_hash::print()
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{
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std::cout<<"{";
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if(!elems.size())
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std::cout<<"}";
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for(std::map<std::string,nasal_scalar*>::iterator i=elems.begin();i!=elems.end();++i)
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{
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std::cout<<i->first<<":";
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nasal_scalar* tmp=i->second;
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switch(tmp->get_type())
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{
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case vm_nil: std::cout<<"nil"; break;
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case vm_number: std::cout<<tmp->get_number(); break;
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case vm_string: std::cout<<tmp->get_string(); break;
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case vm_vector: tmp->get_vector().print(); break;
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case vm_hash: tmp->get_hash().print(); break;
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case vm_function: std::cout<<"func(...){...}"; break;
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}
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std::cout<<",}"[(++i)==elems.end()];
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--i;
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}
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return;
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}
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/*functions of nasal_function*/
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nasal_function::nasal_function(nasal_virtual_machine& nvm):vm(nvm)
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{
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closure_addr=NULL;
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dynamic_para_name=-1;
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return;
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}
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nasal_function::~nasal_function()
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{
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if(closure_addr)
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vm.del_reference(closure_addr);
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for(int i=0;i<default_para_addr.size();++i)
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if(default_para_addr[i])
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vm.del_reference(default_para_addr[i]);
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return;
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}
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void nasal_function::set_entry(int etr)
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{
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entry=etr;
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return;
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}
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int nasal_function::get_entry()
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{
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return entry;
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}
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void nasal_function::add_para(int name_index,nasal_scalar* val_addr=NULL,bool is_dynamic=false)
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{
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if(is_dynamic)
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{
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dynamic_para_name=name_index;
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return;
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}
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para_name.push_back(name_index);
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default_para_addr.push_back(val_addr);
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return;
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}
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std::vector<int>& nasal_function::get_para()
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{
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return para_name;
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}
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int nasal_function::get_dynamic_para()
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{
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return dynamic_para_name;
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}
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std::vector<nasal_scalar*>& nasal_function::get_default()
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{
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return default_para_addr;
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}
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void nasal_function::set_closure_addr(nasal_scalar* value_address)
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{
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nasal_scalar* new_closure=vm.gc_alloc(vm_closure);
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new_closure->get_closure().set_closure(value_address->get_closure());
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closure_addr=new_closure;
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return;
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}
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void nasal_function::set_new_closure()
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{
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closure_addr=vm.gc_alloc(vm_closure);
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return;
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}
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nasal_scalar* nasal_function::get_closure_addr()
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{
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return closure_addr;
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}
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/*functions of nasal_closure*/
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nasal_closure::nasal_closure(nasal_virtual_machine& nvm):vm(nvm)
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{
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std::map<int,nasal_scalar*> new_scope;
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elems.push_back(new_scope);
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return;
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}
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nasal_closure::~nasal_closure()
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{
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for(std::list<std::map<int,nasal_scalar*> >::iterator i=elems.begin();i!=elems.end();++i)
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for(std::map<int,nasal_scalar*>::iterator j=i->begin();j!=i->end();++j)
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vm.del_reference(j->second);
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elems.clear();
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return;
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}
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void nasal_closure::add_scope()
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{
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std::map<int,nasal_scalar*> new_scope;
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elems.push_front(new_scope);
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return;
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}
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void nasal_closure::del_scope()
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{
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std::map<int,nasal_scalar*>& last_scope=elems.front();
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for(std::map<int,nasal_scalar*>::iterator i=last_scope.begin();i!=last_scope.end();++i)
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vm.del_reference(i->second);
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elems.pop_front();
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return;
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}
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void nasal_closure::add_new_value(int key,nasal_scalar* value_address)
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{
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if(elems.front().find(key)!=elems.front().end())
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{
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// if this value already exists,delete the old value and update a new value
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nasal_scalar* old_val_address=elems.front()[key];
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vm.del_reference(old_val_address);
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}
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elems.front()[key]=value_address;
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return;
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}
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nasal_scalar* nasal_closure::get_value_address(int key)
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{
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nasal_scalar* ret_address=NULL;
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for(std::list<std::map<int,nasal_scalar*> >::iterator i=elems.begin();i!=elems.end();++i)
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if(i->find(key)!=i->end())
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return (*i)[key];
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return ret_address;
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}
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nasal_scalar** nasal_closure::get_mem_address(int key)
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{
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nasal_scalar** ret_address=NULL;
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for(std::list<std::map<int,nasal_scalar*> >::iterator i=elems.begin();i!=elems.end();++i)
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if(i->find(key)!=i->end())
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return &((*i)[key]);
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return ret_address;
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}
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void nasal_closure::set_closure(nasal_closure& tmp)
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{
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for(std::list<std::map<int,nasal_scalar*> >::iterator i=elems.begin();i!=elems.end();++i)
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for(std::map<int,nasal_scalar*>::iterator j=i->begin();j!=i->end();++j)
|
|
vm.del_reference(j->second);
|
|
elems.clear();
|
|
for(std::list<std::map<int,nasal_scalar*> >::iterator i=tmp.elems.begin();i!=tmp.elems.end();++i)
|
|
{
|
|
std::map<int,nasal_scalar*> new_scope;
|
|
elems.push_back(new_scope);
|
|
for(std::map<int,nasal_scalar*>::iterator j=i->begin();j!=i->end();++j)
|
|
{
|
|
nasal_scalar* value_addr=j->second;
|
|
vm.add_reference(value_addr);
|
|
elems.back()[j->first]=value_addr;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*functions of nasal_scalar*/
|
|
nasal_scalar::nasal_scalar()
|
|
{
|
|
ref_cnt=1;
|
|
type=vm_nil;
|
|
return;
|
|
}
|
|
nasal_scalar::nasal_scalar(int nasal_scalar_type,nasal_virtual_machine& nvm)
|
|
{
|
|
ref_cnt=1;
|
|
type=nasal_scalar_type;
|
|
switch(nasal_scalar_type)
|
|
{
|
|
case vm_nil: break;
|
|
case vm_number: ptr.num=0; break;
|
|
case vm_string: ptr.str=new std::string; break;
|
|
case vm_vector: ptr.vec=new nasal_vector(nvm); break;
|
|
case vm_hash: ptr.hash=new nasal_hash(nvm); break;
|
|
case vm_function: ptr.func=new nasal_function(nvm); break;
|
|
case vm_closure: ptr.cls=new nasal_closure(nvm); break;
|
|
}
|
|
return;
|
|
}
|
|
nasal_scalar::~nasal_scalar()
|
|
{
|
|
// must set type and scalar_ptr to default first
|
|
// this operation will avoid SIGTRAP caused by circular reference
|
|
// circular reference will cause using destructor repeatedly
|
|
int tmp_type=type;
|
|
type=vm_nil;
|
|
switch(tmp_type)
|
|
{
|
|
case vm_nil: break;
|
|
case vm_number: break;
|
|
case vm_string: delete ptr.str; break;
|
|
case vm_vector: delete ptr.vec; break;
|
|
case vm_hash: delete ptr.hash; break;
|
|
case vm_function: delete ptr.func; break;
|
|
case vm_closure: delete ptr.cls; break;
|
|
}
|
|
return;
|
|
}
|
|
void nasal_scalar::clear()
|
|
{
|
|
// must set type and scalar_ptr to default first
|
|
// this operation will avoid SIGTRAP caused by circular reference
|
|
// circular reference will cause using destructor repeatedly
|
|
int tmp_type=type;
|
|
type=vm_nil;
|
|
switch(tmp_type)
|
|
{
|
|
case vm_nil: break;
|
|
case vm_number: break;
|
|
case vm_string: delete ptr.str; break;
|
|
case vm_vector: delete ptr.vec; break;
|
|
case vm_hash: delete ptr.hash; break;
|
|
case vm_function: delete ptr.func; break;
|
|
case vm_closure: delete ptr.cls; break;
|
|
}
|
|
return;
|
|
}
|
|
void nasal_scalar::set_type(int nasal_scalar_type,nasal_virtual_machine& nvm)
|
|
{
|
|
type=nasal_scalar_type;
|
|
switch(nasal_scalar_type)
|
|
{
|
|
case vm_nil: break;
|
|
case vm_number: ptr.num=0; break;
|
|
case vm_string: ptr.str=new std::string; break;
|
|
case vm_vector: ptr.vec=new nasal_vector(nvm); break;
|
|
case vm_hash: ptr.hash=new nasal_hash(nvm); break;
|
|
case vm_function: ptr.func=new nasal_function(nvm); break;
|
|
case vm_closure: ptr.cls=new nasal_closure(nvm); break;
|
|
}
|
|
return;
|
|
}
|
|
void nasal_scalar::set_number(double num)
|
|
{
|
|
ptr.num=num;
|
|
return;
|
|
}
|
|
void nasal_scalar::set_string(std::string str)
|
|
{
|
|
*ptr.str=str;
|
|
return;
|
|
}
|
|
int nasal_scalar::get_type()
|
|
{
|
|
return type;
|
|
}
|
|
double nasal_scalar::to_number()
|
|
{
|
|
switch(type)
|
|
{
|
|
case vm_nil: return 0;
|
|
case vm_number: return ptr.num;
|
|
case vm_string: return trans_string_to_number(*ptr.str);
|
|
default: return std::nan("");
|
|
}
|
|
return 0;
|
|
}
|
|
double nasal_scalar::get_number()
|
|
{
|
|
return ptr.num;
|
|
}
|
|
std::string nasal_scalar::to_string()
|
|
{
|
|
switch(type)
|
|
{
|
|
case vm_number:return trans_number_to_string(ptr.num);
|
|
case vm_string:return *ptr.str;
|
|
default:return "";
|
|
}
|
|
return "";
|
|
}
|
|
std::string nasal_scalar::get_string()
|
|
{
|
|
return *ptr.str;
|
|
}
|
|
nasal_vector& nasal_scalar::get_vector()
|
|
{
|
|
return *ptr.vec;
|
|
}
|
|
nasal_hash& nasal_scalar::get_hash()
|
|
{
|
|
return *ptr.hash;
|
|
}
|
|
nasal_function& nasal_scalar::get_func()
|
|
{
|
|
return *ptr.func;
|
|
}
|
|
nasal_closure& nasal_scalar::get_closure()
|
|
{
|
|
return *ptr.cls;
|
|
}
|
|
|
|
/*functions of nasal_virtual_machine*/
|
|
nasal_virtual_machine::~nasal_virtual_machine()
|
|
{
|
|
int gc_mem_size=garbage_collector_memory.size();
|
|
for(int i=0;i<gc_mem_size;++i)
|
|
garbage_collector_memory[i]->clear();
|
|
for(int i=0;i<gc_mem_size;++i)
|
|
delete garbage_collector_memory[i];
|
|
while(!garbage_collector_free_space.empty())
|
|
garbage_collector_free_space.pop();
|
|
garbage_collector_memory.clear();
|
|
return;
|
|
}
|
|
void nasal_virtual_machine::debug()
|
|
{
|
|
int gc_mem_size=garbage_collector_memory.size();
|
|
for(int i=0;i<gc_mem_size;++i)
|
|
if(garbage_collector_memory[i]->ref_cnt)
|
|
{
|
|
std::cout<<">> [debug] "<<i<<": "<<garbage_collector_memory[i]->ref_cnt<<" ";
|
|
switch(garbage_collector_memory[i]->get_type())
|
|
{
|
|
case vm_nil:std::cout<<"nil";break;
|
|
case vm_number:std::cout<<"number "<<garbage_collector_memory[i]->get_number();break;
|
|
case vm_string:std::cout<<"string "<<garbage_collector_memory[i]->get_string();break;
|
|
case vm_vector:std::cout<<"vector";break;
|
|
case vm_hash:std::cout<<"hash";break;
|
|
case vm_function:std::cout<<"function";break;
|
|
case vm_closure:std::cout<<"closure";break;
|
|
}
|
|
std::cout<<"\n";
|
|
}
|
|
return;
|
|
}
|
|
void nasal_virtual_machine::clear()
|
|
{
|
|
int gc_mem_size=garbage_collector_memory.size();
|
|
for(int i=0;i<gc_mem_size;++i)
|
|
garbage_collector_memory[i]->clear();
|
|
for(int i=0;i<gc_mem_size;++i)
|
|
delete garbage_collector_memory[i];
|
|
while(!garbage_collector_free_space.empty())
|
|
garbage_collector_free_space.pop();
|
|
garbage_collector_memory.clear();
|
|
return;
|
|
}
|
|
nasal_scalar* nasal_virtual_machine::gc_alloc(int val_type)
|
|
{
|
|
if(garbage_collector_free_space.empty())
|
|
{
|
|
nasal_scalar* new_unit=new nasal_scalar(val_type,*this);
|
|
garbage_collector_memory.push_back(new_unit);
|
|
return new_unit;
|
|
}
|
|
nasal_scalar* ret=garbage_collector_free_space.front();
|
|
garbage_collector_free_space.pop();
|
|
ret->ref_cnt=1;
|
|
ret->set_type(val_type,*this);
|
|
return ret;
|
|
}
|
|
void nasal_virtual_machine::add_reference(nasal_scalar* value_address)
|
|
{
|
|
++value_address->ref_cnt;
|
|
return;
|
|
}
|
|
void nasal_virtual_machine::del_reference(nasal_scalar* value_address)
|
|
{
|
|
--value_address->ref_cnt;
|
|
if(!value_address->ref_cnt)
|
|
{
|
|
value_address->clear();
|
|
garbage_collector_free_space.push(value_address);
|
|
}
|
|
return;
|
|
}
|
|
|
|
#endif |