int GDCompiler::_parse_expression(CodeGen& codegen,const GDParser::Node *p_expression, int p_stack_level,bool p_root) {
switch(p_expression->type) {
//should parse variable declaration and adjust stack accordingly...
case GDParser::Node::TYPE_IDENTIFIER: {
//return identifier
//wait, identifier could be a local variable or something else... careful here, must reference properly
//as stack may be more interesting to work with
//This could be made much simpler by just indexing "self", but done this way (with custom self-addressing modes) increases peformance a lot.
const GDParser::IdentifierNode *in = static_cast<const GDParser::IdentifierNode*>(p_expression);
StringName identifier = in->name;
// TRY STACK!
if (codegen.stack_identifiers.has(identifier)) {
int pos = codegen.stack_identifiers[identifier];
return pos|(GDFunction::ADDR_TYPE_STACK_VARIABLE<<GDFunction::ADDR_BITS);
}
//TRY ARGUMENTS!
if (!codegen.function_node || !codegen.function_node->_static) {
// TRY MEMBER VARIABLES!
//static function
if (codegen.script->member_indices.has(identifier)) {
int idx = codegen.script->member_indices[identifier];
return idx|(GDFunction::ADDR_TYPE_MEMBER<<GDFunction::ADDR_BITS); //argument (stack root)
}
}
//TRY CLASS CONSTANTS
GDScript *owner = codegen.script;
while (owner) {
GDScript *scr = owner;
GDNativeClass *nc=NULL;
while(scr) {
if (scr->constants.has(identifier)) {
//int idx=scr->constants[identifier];
int idx = codegen.get_name_map_pos(identifier);
return idx|(GDFunction::ADDR_TYPE_CLASS_CONSTANT<<GDFunction::ADDR_BITS); //argument (stack root)
}
if (scr->native.is_valid())
nc=scr->native.ptr();
scr=scr->_base;
}
// CLASS C++ Integer Constant
if (nc) {
bool success=false;
int constant = ObjectTypeDB::get_integer_constant(nc->get_name(),identifier,&success);
if (success) {
Variant key=constant;
int idx;
if (!codegen.constant_map.has(key)) {
idx=codegen.constant_map.size();
codegen.constant_map[key]=idx;
} else {
idx=codegen.constant_map[key];
}
return idx|(GDFunction::ADDR_TYPE_LOCAL_CONSTANT<<GDFunction::ADDR_BITS); //make it a local constant (faster access)
}
}
owner=owner->_owner;
}
/*
handled in constants now
if (codegen.script->subclasses.has(identifier)) {
//same with a subclass, make it a local constant.
int idx = codegen.get_constant_pos(codegen.script->subclasses[identifier]);
return idx|(GDFunction::ADDR_TYPE_LOCAL_CONSTANT<<GDFunction::ADDR_BITS); //make it a local constant (faster access)
}*/
if (GDScriptLanguage::get_singleton()->get_global_map().has(identifier)) {
int idx = GDScriptLanguage::get_singleton()->get_global_map()[identifier];
return idx|(GDFunction::ADDR_TYPE_GLOBAL<<GDFunction::ADDR_BITS); //argument (stack root)
}
//not found, error
_set_error("Identifier not found: "+String(identifier),p_expression);
return -1;
} break;
case GDParser::Node::TYPE_CONSTANT: {
//return constant
const GDParser::ConstantNode *cn = static_cast<const GDParser::ConstantNode*>(p_expression);
int idx;
if (!codegen.constant_map.has(cn->value)) {
idx=codegen.constant_map.size();
codegen.constant_map[cn->value]=idx;
} else {
idx=codegen.constant_map[cn->value];
}
return idx|(GDFunction::ADDR_TYPE_LOCAL_CONSTANT<<GDFunction::ADDR_BITS); //argument (stack root)
} break;
case GDParser::Node::TYPE_SELF: {
//return constant
if (codegen.function_node && codegen.function_node->_static) {
_set_error("'self' not present in static function!",p_expression);
return -1;
}
return (GDFunction::ADDR_TYPE_SELF<<GDFunction::ADDR_BITS);
} break;
case GDParser::Node::TYPE_ARRAY: {
const GDParser::ArrayNode *an = static_cast<const GDParser::ArrayNode*>(p_expression);
Vector<int> values;
int slevel=p_stack_level;
for(int i=0;i<an->elements.size();i++) {
int ret = _parse_expression(codegen,an->elements[i],slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
values.push_back(ret);
}
codegen.opcodes.push_back(GDFunction::OPCODE_CONSTRUCT_ARRAY);
codegen.opcodes.push_back(values.size());
for(int i=0;i<values.size();i++)
codegen.opcodes.push_back(values[i]);
int dst_addr=(p_stack_level)|(GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
codegen.opcodes.push_back(dst_addr); // append the stack level as destination address of the opcode
codegen.alloc_stack(p_stack_level);
return dst_addr;
} break;
case GDParser::Node::TYPE_DICTIONARY: {
const GDParser::DictionaryNode *dn = static_cast<const GDParser::DictionaryNode*>(p_expression);
Vector<int> values;
int slevel=p_stack_level;
for(int i=0;i<dn->elements.size();i++) {
int ret = _parse_expression(codegen,dn->elements[i].key,slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
values.push_back(ret);
ret = _parse_expression(codegen,dn->elements[i].value,slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
values.push_back(ret);
}
codegen.opcodes.push_back(GDFunction::OPCODE_CONSTRUCT_DICTIONARY);
codegen.opcodes.push_back(dn->elements.size());
for(int i=0;i<values.size();i++)
codegen.opcodes.push_back(values[i]);
int dst_addr=(p_stack_level)|(GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
codegen.opcodes.push_back(dst_addr); // append the stack level as destination address of the opcode
codegen.alloc_stack(p_stack_level);
return dst_addr;
} break;
case GDParser::Node::TYPE_OPERATOR: {
//hell breaks loose
const GDParser::OperatorNode *on = static_cast<const GDParser::OperatorNode*>(p_expression);
switch(on->op) {
//call/constructor operator
case GDParser::OperatorNode::OP_PARENT_CALL: {
ERR_FAIL_COND_V(on->arguments.size()<1,-1);
const GDParser::IdentifierNode *in = (const GDParser::IdentifierNode *)on->arguments[0];
Vector<int> arguments;
int slevel = p_stack_level;
for(int i=1;i<on->arguments.size();i++) {
int ret = _parse_expression(codegen,on->arguments[i],slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
arguments.push_back(ret);
}
//push call bytecode
codegen.opcodes.push_back(GDFunction::OPCODE_CALL_SELF_BASE); // basic type constructor
codegen.opcodes.push_back(codegen.get_name_map_pos(in->name)); //instance
codegen.opcodes.push_back(arguments.size()); //argument count
codegen.alloc_call(arguments.size());
for(int i=0;i<arguments.size();i++)
codegen.opcodes.push_back(arguments[i]); //arguments
} break;
case GDParser::OperatorNode::OP_CALL: {
if (on->arguments[0]->type==GDParser::Node::TYPE_TYPE) {
//construct a basic type
ERR_FAIL_COND_V(on->arguments.size()<1,-1);
const GDParser::TypeNode *tn = (const GDParser::TypeNode *)on->arguments[0];
int vtype = tn->vtype;
Vector<int> arguments;
int slevel = p_stack_level;
for(int i=1;i<on->arguments.size();i++) {
int ret = _parse_expression(codegen,on->arguments[i],slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
arguments.push_back(ret);
}
//push call bytecode
codegen.opcodes.push_back(GDFunction::OPCODE_CONSTRUCT); // basic type constructor
codegen.opcodes.push_back(vtype); //instance
codegen.opcodes.push_back(arguments.size()); //argument count
codegen.alloc_call(arguments.size());
for(int i=0;i<arguments.size();i++)
codegen.opcodes.push_back(arguments[i]); //arguments
} else if (on->arguments[0]->type==GDParser::Node::TYPE_BUILT_IN_FUNCTION) {
//built in function
ERR_FAIL_COND_V(on->arguments.size()<1,-1);
Vector<int> arguments;
int slevel = p_stack_level;
for(int i=1;i<on->arguments.size();i++) {
int ret = _parse_expression(codegen,on->arguments[i],slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
arguments.push_back(ret);
}
codegen.opcodes.push_back(GDFunction::OPCODE_CALL_BUILT_IN);
codegen.opcodes.push_back(static_cast<const GDParser::BuiltInFunctionNode*>(on->arguments[0])->function);
codegen.opcodes.push_back(on->arguments.size()-1);
codegen.alloc_call(on->arguments.size()-1);
for(int i=0;i<arguments.size();i++)
codegen.opcodes.push_back(arguments[i]);
} else {
//regular function
ERR_FAIL_COND_V(on->arguments.size()<2,-1);
const GDParser::Node *instance = on->arguments[0];
bool in_static=false;
if (instance->type==GDParser::Node::TYPE_SELF) {
//room for optimization
}
Vector<int> arguments;
int slevel = p_stack_level;
for(int i=0;i<on->arguments.size();i++) {
int ret;
if (i==0 && on->arguments[i]->type==GDParser::Node::TYPE_SELF && codegen.function_node && codegen.function_node->_static) {
//static call to self
ret=(GDFunction::ADDR_TYPE_CLASS<<GDFunction::ADDR_BITS);
} else if (i==1) {
if (on->arguments[i]->type!=GDParser::Node::TYPE_IDENTIFIER) {
_set_error("Attempt to call a non-identifier.",on);
return -1;
}
GDParser::IdentifierNode *id = static_cast<GDParser::IdentifierNode*>(on->arguments[i]);
ret=codegen.get_name_map_pos(id->name);
} else {
ret = _parse_expression(codegen,on->arguments[i],slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
}
arguments.push_back(ret);
}
codegen.opcodes.push_back(p_root?GDFunction::OPCODE_CALL:GDFunction::OPCODE_CALL_RETURN); // perform operator
codegen.opcodes.push_back(on->arguments.size()-2);
codegen.alloc_call(on->arguments.size()-2);
for(int i=0;i<arguments.size();i++)
codegen.opcodes.push_back(arguments[i]);
}
} break;
case GDParser::OperatorNode::OP_YIELD: {
ERR_FAIL_COND_V(on->arguments.size() && on->arguments.size()!=2,-1);
Vector<int> arguments;
int slevel = p_stack_level;
for(int i=0;i<on->arguments.size();i++) {
int ret = _parse_expression(codegen,on->arguments[i],slevel);
if (ret<0)
return ret;
if (ret&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
arguments.push_back(ret);
}
//push call bytecode
codegen.opcodes.push_back(arguments.size()==0?GDFunction::OPCODE_YIELD:GDFunction::OPCODE_YIELD_SIGNAL); // basic type constructor
for(int i=0;i<arguments.size();i++)
codegen.opcodes.push_back(arguments[i]); //arguments
codegen.opcodes.push_back(GDFunction::OPCODE_YIELD_RESUME);
//next will be where to place the result :)
} break;
//indexing operator
case GDParser::OperatorNode::OP_INDEX:
case GDParser::OperatorNode::OP_INDEX_NAMED: {
ERR_FAIL_COND_V(on->arguments.size()!=2,-1);
int slevel = p_stack_level;
bool named=(on->op==GDParser::OperatorNode::OP_INDEX_NAMED);
int from = _parse_expression(codegen,on->arguments[0],slevel);
if (from<0)
return from;
int index;
if (named) {
index=codegen.get_name_map_pos(static_cast<GDParser::IdentifierNode*>(on->arguments[1])->name);
} else {
if (on->arguments[1]->type==GDParser::Node::TYPE_CONSTANT && static_cast<const GDParser::ConstantNode*>(on->arguments[1])->value.get_type()==Variant::STRING) {
//also, somehow, named (speed up anyway)
StringName name = static_cast<const GDParser::ConstantNode*>(on->arguments[1])->value;
index=codegen.get_name_map_pos(name);
named=true;
} else {
//regular indexing
if (from&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
index = _parse_expression(codegen,on->arguments[1],slevel);
if (index<0)
return index;
}
}
codegen.opcodes.push_back(named?GDFunction::OPCODE_GET_NAMED:GDFunction::OPCODE_GET); // perform operator
codegen.opcodes.push_back(from); // argument 1
codegen.opcodes.push_back(index); // argument 2 (unary only takes one parameter)
} break;
case GDParser::OperatorNode::OP_AND: {
// AND operator with early out on failure
int res = _parse_expression(codegen,on->arguments[0],p_stack_level);
if (res<0)
return res;
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP_IF_NOT);
codegen.opcodes.push_back(res);
int jump_fail_pos=codegen.opcodes.size();
codegen.opcodes.push_back(0);
res = _parse_expression(codegen,on->arguments[1],p_stack_level);
if (res<0)
return res;
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP_IF_NOT);
codegen.opcodes.push_back(res);
int jump_fail_pos2=codegen.opcodes.size();
codegen.opcodes.push_back(0);
codegen.alloc_stack(p_stack_level); //it will be used..
codegen.opcodes.push_back(GDFunction::OPCODE_ASSIGN_TRUE);
codegen.opcodes.push_back(p_stack_level|GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP);
codegen.opcodes.push_back(codegen.opcodes.size()+3);
codegen.opcodes[jump_fail_pos]=codegen.opcodes.size();
codegen.opcodes[jump_fail_pos2]=codegen.opcodes.size();
codegen.opcodes.push_back(GDFunction::OPCODE_ASSIGN_FALSE);
codegen.opcodes.push_back(p_stack_level|GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
return p_stack_level|GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS;
} break;
case GDParser::OperatorNode::OP_OR: {
// OR operator with early out on success
int res = _parse_expression(codegen,on->arguments[0],p_stack_level);
if (res<0)
return res;
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP_IF);
codegen.opcodes.push_back(res);
int jump_success_pos=codegen.opcodes.size();
codegen.opcodes.push_back(0);
res = _parse_expression(codegen,on->arguments[1],p_stack_level);
if (res<0)
return res;
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP_IF);
codegen.opcodes.push_back(res);
int jump_success_pos2=codegen.opcodes.size();
codegen.opcodes.push_back(0);
codegen.alloc_stack(p_stack_level); //it will be used..
codegen.opcodes.push_back(GDFunction::OPCODE_ASSIGN_FALSE);
codegen.opcodes.push_back(p_stack_level|GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP);
codegen.opcodes.push_back(codegen.opcodes.size()+3);
codegen.opcodes[jump_success_pos]=codegen.opcodes.size();
codegen.opcodes[jump_success_pos2]=codegen.opcodes.size();
codegen.opcodes.push_back(GDFunction::OPCODE_ASSIGN_TRUE);
codegen.opcodes.push_back(p_stack_level|GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
return p_stack_level|GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS;
} break;
//unary operators
case GDParser::OperatorNode::OP_NEG: { if (!_create_unary_operator(codegen,on,Variant::OP_NEGATE,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_NOT: { if (!_create_unary_operator(codegen,on,Variant::OP_NOT,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_BIT_INVERT: { if (!_create_unary_operator(codegen,on,Variant::OP_BIT_NEGATE,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_PREINC: { } break; //?
case GDParser::OperatorNode::OP_PREDEC: { } break;
case GDParser::OperatorNode::OP_INC: { } break;
case GDParser::OperatorNode::OP_DEC: { } break;
//binary operators (in precedence order)
case GDParser::OperatorNode::OP_IN: { if (!_create_binary_operator(codegen,on,Variant::OP_IN,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_EQUAL: { if (!_create_binary_operator(codegen,on,Variant::OP_EQUAL,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_NOT_EQUAL: { if (!_create_binary_operator(codegen,on,Variant::OP_NOT_EQUAL,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_LESS: { if (!_create_binary_operator(codegen,on,Variant::OP_LESS,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_LESS_EQUAL: { if (!_create_binary_operator(codegen,on,Variant::OP_LESS_EQUAL,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_GREATER: { if (!_create_binary_operator(codegen,on,Variant::OP_GREATER,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_GREATER_EQUAL: { if (!_create_binary_operator(codegen,on,Variant::OP_GREATER_EQUAL,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_ADD: { if (!_create_binary_operator(codegen,on,Variant::OP_ADD,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_SUB: { if (!_create_binary_operator(codegen,on,Variant::OP_SUBSTRACT,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_MUL: { if (!_create_binary_operator(codegen,on,Variant::OP_MULTIPLY,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_DIV: { if (!_create_binary_operator(codegen,on,Variant::OP_DIVIDE,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_MOD: { if (!_create_binary_operator(codegen,on,Variant::OP_MODULE,p_stack_level)) return -1;} break;
//case GDParser::OperatorNode::OP_SHIFT_LEFT: { if (!_create_binary_operator(codegen,on,Variant::OP_SHIFT_LEFT,p_stack_level)) return -1;} break;
//case GDParser::OperatorNode::OP_SHIFT_RIGHT: { if (!_create_binary_operator(codegen,on,Variant::OP_SHIFT_RIGHT,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_BIT_AND: { if (!_create_binary_operator(codegen,on,Variant::OP_BIT_AND,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_BIT_OR: { if (!_create_binary_operator(codegen,on,Variant::OP_BIT_OR,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_BIT_XOR: { if (!_create_binary_operator(codegen,on,Variant::OP_BIT_XOR,p_stack_level)) return -1;} break;
//shift
case GDParser::OperatorNode::OP_SHIFT_LEFT: { if (!_create_binary_operator(codegen,on,Variant::OP_SHIFT_LEFT,p_stack_level)) return -1;} break;
case GDParser::OperatorNode::OP_SHIFT_RIGHT: { if (!_create_binary_operator(codegen,on,Variant::OP_SHIFT_RIGHT,p_stack_level)) return -1;} break;
//assignment operators
case GDParser::OperatorNode::OP_ASSIGN_ADD:
case GDParser::OperatorNode::OP_ASSIGN_SUB:
case GDParser::OperatorNode::OP_ASSIGN_MUL:
case GDParser::OperatorNode::OP_ASSIGN_DIV:
case GDParser::OperatorNode::OP_ASSIGN_MOD:
case GDParser::OperatorNode::OP_ASSIGN_SHIFT_LEFT:
case GDParser::OperatorNode::OP_ASSIGN_SHIFT_RIGHT:
case GDParser::OperatorNode::OP_ASSIGN_BIT_AND:
case GDParser::OperatorNode::OP_ASSIGN_BIT_OR:
case GDParser::OperatorNode::OP_ASSIGN_BIT_XOR:
case GDParser::OperatorNode::OP_ASSIGN: {
ERR_FAIL_COND_V(on->arguments.size()!=2,-1);
if (on->arguments[0]->type==GDParser::Node::TYPE_OPERATOR && (static_cast<GDParser::OperatorNode*>(on->arguments[0])->op==GDParser::OperatorNode::OP_INDEX || static_cast<GDParser::OperatorNode*>(on->arguments[0])->op==GDParser::OperatorNode::OP_INDEX_NAMED)) {
//SET (chained) MODE!!
int slevel=p_stack_level;
GDParser::OperatorNode* op = static_cast<GDParser::OperatorNode*>(on->arguments[0]);
/* Find chain of sets */
List<GDParser::OperatorNode*> chain;
{
//create get/set chain
GDParser::OperatorNode* n=op;
while(true) {
chain.push_back(n);
if (n->arguments[0]->type!=GDParser::Node::TYPE_OPERATOR)
break;
n = static_cast<GDParser::OperatorNode*>(n->arguments[0]);
if (n->op!=GDParser::OperatorNode::OP_INDEX && n->op!=GDParser::OperatorNode::OP_INDEX_NAMED)
break;
}
}
/* Chain of gets */
//get at (potential) root stack pos, so it can be returned
int prev_pos = _parse_expression(codegen,chain.back()->get()->arguments[0],slevel);
if (prev_pos<0)
return prev_pos;
int retval=prev_pos;
//print_line("retval: "+itos(retval));
if (retval&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
Vector<int> setchain;
int prev_key_idx=-1;
for(List<GDParser::OperatorNode*>::Element *E=chain.back();E;E=E->prev()) {
if (E==chain.front()) //ignore first
break;
bool named = E->get()->op==GDParser::OperatorNode::OP_INDEX_NAMED;
int key_idx;
if (named) {
key_idx = codegen.get_name_map_pos(static_cast<const GDParser::IdentifierNode*>(E->get()->arguments[1])->name);
//printf("named key %x\n",key_idx);
} else {
if (prev_pos&(GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS)) {
slevel++;
codegen.alloc_stack(slevel);
}
GDParser::Node *key = E->get()->arguments[1];
key_idx = _parse_expression(codegen,key,slevel);
//printf("expr key %x\n",key_idx);
//stack was raised here if retval was stack but..
}
if (key_idx<0)
return key_idx;
codegen.opcodes.push_back(named ? GDFunction::OPCODE_GET_NAMED : GDFunction::OPCODE_GET);
codegen.opcodes.push_back(prev_pos);
codegen.opcodes.push_back(key_idx);
slevel++;
codegen.alloc_stack(slevel);
int dst_pos = (GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS)|slevel;
codegen.opcodes.push_back(dst_pos);
//add in reverse order, since it will be reverted
setchain.push_back(dst_pos);
setchain.push_back(key_idx);
setchain.push_back(prev_pos);
setchain.push_back(named ? GDFunction::OPCODE_SET_NAMED : GDFunction::OPCODE_SET);
prev_pos=dst_pos;
prev_key_idx=key_idx;
}
setchain.invert();
int set_index;
bool named=false;
if (static_cast<const GDParser::OperatorNode*>(op)->op==GDParser::OperatorNode::OP_INDEX_NAMED) {
set_index=codegen.get_name_map_pos(static_cast<const GDParser::IdentifierNode*>(op->arguments[1])->name);
named=true;
} else {
set_index = _parse_expression(codegen,op->arguments[1],slevel+1);
named=false;
}
if (set_index<0)
return set_index;
if (set_index&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
int set_value = _parse_assign_right_expression(codegen,on,slevel+1);
if (set_value<0)
return set_value;
codegen.opcodes.push_back(named?GDFunction::OPCODE_SET_NAMED:GDFunction::OPCODE_SET);
codegen.opcodes.push_back(prev_pos);
codegen.opcodes.push_back(set_index);
codegen.opcodes.push_back(set_value);
for(int i=0;i<setchain.size();i+=4) {
codegen.opcodes.push_back(setchain[i+0]);
codegen.opcodes.push_back(setchain[i+1]);
codegen.opcodes.push_back(setchain[i+2]);
codegen.opcodes.push_back(setchain[i+3]);
}
return retval;
} else {
//ASSIGNMENT MODE!!
int slevel = p_stack_level;
int dst_address_a = _parse_expression(codegen,on->arguments[0],slevel);
if (dst_address_a<0)
return -1;
if (dst_address_a&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS) {
slevel++;
codegen.alloc_stack(slevel);
}
int src_address_b = _parse_assign_right_expression(codegen,on,slevel);
if (src_address_b<0)
return -1;
codegen.opcodes.push_back(GDFunction::OPCODE_ASSIGN); // perform operator
codegen.opcodes.push_back(dst_address_a); // argument 1
codegen.opcodes.push_back(src_address_b); // argument 2 (unary only takes one parameter)
return dst_address_a; //if anything, returns wathever was assigned or correct stack position
}
} break;
case GDParser::OperatorNode::OP_EXTENDS: {
ERR_FAIL_COND_V(on->arguments.size()!=2,false);
int slevel = p_stack_level;
int src_address_a = _parse_expression(codegen,on->arguments[0],slevel);
if (src_address_a<0)
return -1;
if (src_address_a&GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS)
slevel++; //uses stack for return, increase stack
int src_address_b = _parse_expression(codegen,on->arguments[1],slevel);
if (src_address_b<0)
return -1;
codegen.opcodes.push_back(GDFunction::OPCODE_EXTENDS_TEST); // perform operator
codegen.opcodes.push_back(src_address_a); // argument 1
codegen.opcodes.push_back(src_address_b); // argument 2 (unary only takes one parameter)
} break;
default: {
ERR_EXPLAIN("Bug in bytecode compiler, unexpected operator #"+itos(on->op)+" in parse tree while parsing expression.");
ERR_FAIL_V(0); //unreachable code
} break;
}
int dst_addr=(p_stack_level)|(GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS);
codegen.opcodes.push_back(dst_addr); // append the stack level as destination address of the opcode
codegen.alloc_stack(p_stack_level);
return dst_addr;
} break;
//TYPE_TYPE,
default: {
ERR_EXPLAIN("Bug in bytecode compiler, unexpected node in parse tree while parsing expression.");
ERR_FAIL_V(-1); //unreachable code
} break;
}
ERR_FAIL_V(-1); //unreachable code
}
Error GDCompiler::_parse_function(GDScript *p_script,const GDParser::ClassNode *p_class,const GDParser::FunctionNode *p_func) {
Vector<int> bytecode;
CodeGen codegen;
codegen.class_node=p_class;
codegen.script=p_script;
codegen.function_node=p_func;
codegen.stack_max=0;
codegen.current_line=0;
codegen.call_max=0;
codegen.debug_stack=ScriptDebugger::get_singleton()!=NULL;
int stack_level=0;
if (p_func) {
for(int i=0;i<p_func->arguments.size();i++) {
int idx = i;
codegen.add_stack_identifier(p_func->arguments[i],i);
}
stack_level=p_func->arguments.size();
}
codegen.alloc_stack(stack_level);
/* Parse initializer -if applies- */
bool is_initializer=false || !p_func;
if (!p_func || String(p_func->name)=="_init") {
//parse initializer for class members
if (!p_func && p_class->extends_used && p_script->native.is_null()){
//call implicit parent constructor
codegen.opcodes.push_back(GDFunction::OPCODE_CALL_SELF_BASE);
codegen.opcodes.push_back(codegen.get_name_map_pos("_init"));
codegen.opcodes.push_back(0);
codegen.opcodes.push_back((GDFunction::ADDR_TYPE_STACK<<GDFunction::ADDR_BITS)|0);
}
Error err = _parse_block(codegen,p_class->initializer,stack_level);
if (err)
return err;
is_initializer=true;
}
/* Parse default argument code -if applies- */
Vector<int> defarg_addr;
StringName func_name;
if (p_func) {
if (p_func->default_values.size()) {
codegen.opcodes.push_back(GDFunction::OPCODE_JUMP_TO_DEF_ARGUMENT);
defarg_addr.push_back(codegen.opcodes.size());
for(int i=0;i<p_func->default_values.size();i++) {
_parse_expression(codegen,p_func->default_values[i],stack_level,true);
defarg_addr.push_back(codegen.opcodes.size());
}
defarg_addr.invert();
}
Error err = _parse_block(codegen,p_func->body,stack_level);
if (err)
return err;
func_name=p_func->name;
} else {
func_name="_init";
}
codegen.opcodes.push_back(GDFunction::OPCODE_END);
GDFunction *gdfunc=NULL;
//if (String(p_func->name)=="") { //initializer func
// gdfunc = &p_script->initializer;
//} else { //regular func
p_script->member_functions[func_name]=GDFunction();
gdfunc = &p_script->member_functions[func_name];
//}
if (p_func)
gdfunc->_static=p_func->_static;
//constants
if (codegen.constant_map.size()) {
gdfunc->_constant_count=codegen.constant_map.size();
gdfunc->constants.resize(codegen.constant_map.size());
gdfunc->_constants_ptr=&gdfunc->constants[0];
const Variant *K=NULL;
while((K=codegen.constant_map.next(K))) {
int idx = codegen.constant_map[*K];
gdfunc->constants[idx]=*K;
}
} else {
gdfunc->_constants_ptr=NULL;
gdfunc->_constant_count=0;
}
//global names
if (codegen.name_map.size()) {
gdfunc->global_names.resize(codegen.name_map.size());
gdfunc->_global_names_ptr = &gdfunc->global_names[0];
for(Map<StringName,int>::Element *E=codegen.name_map.front();E;E=E->next()) {
gdfunc->global_names[E->get()]=E->key();
}
gdfunc->_global_names_count=gdfunc->global_names.size();
} else {
gdfunc->_global_names_ptr = NULL;
gdfunc->_global_names_count =0;
}
if (codegen.opcodes.size()) {
gdfunc->code=codegen.opcodes;
gdfunc->_code_ptr=&gdfunc->code[0];
gdfunc->_code_size=codegen.opcodes.size();
} else {
gdfunc->_code_ptr=NULL;
gdfunc->_code_size=0;
}
if (defarg_addr.size()) {
gdfunc->default_arguments=defarg_addr;
gdfunc->_default_arg_count=defarg_addr.size();
gdfunc->_default_arg_ptr=&gdfunc->default_arguments[0];
} else {
gdfunc->_default_arg_count=0;
gdfunc->_default_arg_ptr=NULL;
}
gdfunc->_argument_count=p_func ? p_func->arguments.size() : 0;
gdfunc->_stack_size=codegen.stack_max;
gdfunc->_call_size=codegen.call_max;
gdfunc->name=func_name;
gdfunc->_script=p_script;
gdfunc->source=source;
#ifdef DEBUG_ENABLED
{
gdfunc->func_cname=(String(source)+" - "+String(func_name)).utf8();
gdfunc->_func_cname=gdfunc->func_cname.get_data();
}
#endif
if (p_func) {
gdfunc->_initial_line=p_func->line;
} else {
gdfunc->_initial_line=0;
}
if (codegen.debug_stack)
gdfunc->stack_debug=codegen.stack_debug;
if (is_initializer)
p_script->initializer=gdfunc;
return OK;
}