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Valk Richard Li
2020-03-09 01:38:23 +08:00
committed by GitHub
parent 0def424c71
commit 2b799db790
2 changed files with 203 additions and 51 deletions
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version2.0/nasal_gc.h
+77 -17
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@@ -20,6 +20,7 @@ class nasal_function
public:
nasal_function();
void set_clear();
void set_local_scope(std::list<std::map<std::string,int> >&);
void set_statement_block(abstract_syntax_tree&);
void set_parent_hash_addr(int);
std::list<std::map<std::string,int> >& get_local_scope();
@@ -72,6 +73,7 @@ class nasal_hash
void set_self_addr(int);
void set_clear();
int get_self_addr();
int get_hash_member(std::string);
void hash_push(std::string,int);
void hash_pop(std::string);
void deep_copy(nasal_hash&);
@@ -99,10 +101,11 @@ class nasal_scalar
struct gc_unit
{
// collected: If gc collected this item,it'll be set to true.Otherwise it is false.
// collected: If gc collected this item,it'll be set to true.Otherwise it is false.
// elem: Item that this unit stores
// refcnt: Reference counter
bool collected;
bool is_const;
nasal_scalar elem;
int refcnt;
gc_unit()
@@ -150,12 +153,14 @@ class gc_manager
}
nasal_scalar& get_scalar(int addr)
{
// get the reference of the scalar
return memory[addr].elem;
}
bool place_check(const int place)
{
// check if this place is in memory
// and this place is uncollected
// this function is often used when an identifier is calling a space in memory
return (place<memory.size()) && (!memory[place].collected);
}
void reference_add(const int place)
@@ -241,6 +246,14 @@ void nasal_function::set_clear()
parent_hash_addr=-1;
return;
}
void nasal_function::set_local_scope(std::list<std::map<std::string,int> >& tmp_scope)
{
local_scope=tmp_scope;
for(std::list<std::map<std::string,int> >::iterator iter=local_scope.begin();iter!=local_scope.end();++iter)
for(std::map<std::string,int>::iterator i=iter->begin();i!=iter->end();++i)
nasal_gc.reference_add(i->second);
return;
}
void nasal_function::set_statement_block(abstract_syntax_tree& func_block)
{
function_root=func_block;
@@ -248,7 +261,31 @@ void nasal_function::set_statement_block(abstract_syntax_tree& func_block)
}
void nasal_function::set_parent_hash_addr(int addr)
{
// in normal cases this function is often called after this->set_local_scope(...)
// because creating a new nasal function needs local_scope(closure) and abstract syntax tree.
// then the nasal function will be given to an identifier.
// after checking the identifier and making sure it is a hash,
// call this function and set 'me' to this addr if exists.
// if 'me' does not exist,then add a new identifeir named 'me' and give it the addr.
// also 'me' can be changed in hash function by ways like "var me=1;"
parent_hash_addr=addr;
bool has_identifier_me=false;
for(std::list<std::map<std::string,int> >::iterator iter=local_scope.begin();iter!=local_scope.end();++iter)
for(std::map<std::string,int>::iterator i=iter->begin();i!=iter->end();++i)
if(i->first=="me")
{
has_identifier_me=true;
i->second=parent_hash_addr;
}
if(!has_identifier_me)
{
if(local_scope.empty())
{
std::map<std::string,int> new_scope;
local_scope.push_back(new_scope);
}
local_scope.back()["me"]=parent_hash_addr;
}
return;
}
std::list<std::map<std::string,int> >& nasal_function::get_local_scope()
@@ -265,27 +302,13 @@ void nasal_function::deep_copy(nasal_function& tmp)
for(std::list<std::map<std::string,int> >::iterator iter=local_scope.begin();iter!=local_scope.end();++iter)
for(std::map<std::string,int>::iterator i=iter->begin();i!=iter->end();++i)
nasal_gc.reference_delete(i->second);
// when copying a local scope,one thing that must be noticed is that
// each identifier in local_scope shares the same address with tmp.local_scope
// copy all the values in tmp's scope
local_scope=tmp.local_scope;
for(std::list<std::map<std::string,int> >::iterator iter=local_scope.begin();iter!=local_scope.end();++iter)
for(std::map<std::string,int>::iterator i=iter->begin();i!=iter->end();++i)
if(i->first!="me")
nasal_gc.reference_add(i->second);
// change the 'me' address to this function's parent_hash_addr
if(!local_scope.empty())
{
std::list<std::map<std::string,int> >::iterator begin_iter=local_scope.begin();
if(begin_iter->find("me")!=begin_iter->end())
{
if(parent_hash_addr>=0)
{
(*begin_iter)["me"]=parent_hash_addr;
nasal_gc.reference_add(parent_hash_addr);
}
else
begin_iter->erase("me");
}
}
// copy abstract_syntax_tree
function_root=tmp.function_root;
return;
@@ -401,6 +424,12 @@ int nasal_hash::get_self_addr()
{
return self_addr;
}
int nasal_hash::get_hash_member(std::string member_name)
{
if(nas_hash.find(member_name)!=nas_hash.end())
return nas_hash[member_name];
return -1;
}
void nasal_hash::hash_push(std::string member_name,int addr)
{
if(nas_hash.find(member_name)==nas_hash.end())
@@ -467,27 +496,58 @@ void nasal_scalar::set_type(int tmp_type)
}
int nasal_scalar::get_type()
{
// get scalar type
return type;
}
nasal_number& nasal_scalar::get_number()
{
// get nasal_number
return var_number;
}
nasal_string& nasal_scalar::get_string()
{
// get nasal_string
return var_string;
}
nasal_vector& nasal_scalar::get_vector()
{
// get nasal_vector
return var_vector;
}
nasal_hash& nasal_scalar::get_hash()
{
// get nasal_hash
return var_hash;
}
nasal_function& nasal_scalar::get_function()
{
// get nasal_function
return var_func;
}
#endif
/*
code: var i=1;
int addr=nasal_gc.gc_alloc();
nasal_gc.get_scalar(addr).set_type(scalar_number);
nasal_gc.get_scalar(addr).set_number(1);
code: var i='hello';
int addr=nasal_gc.gc_alloc();
nasal_gc.get_scalar(addr).set_type(scalar_string);
nasal_gc.get_scalar(addr).set_string("hello");
code: var i=[];
int addr=vector_generation();
nasal_gc.get_scalar(addr).set_type(scalar_vector);
code: var i={};
int addr=hash_generation();
nasal_gc.get_scalar(addr).set_type(scalar_hash);
nasal_gc.get_scalar(addr).get_hash().set_self_addr(addr);
code: var i=func{return 0;}
// copy local_scope if needed
// copy abstract_syntax_tree
*/