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godot/modules/gdscript/gdscript_function.h
Pedro J. Estébanez 95828161d4 Prevent cyclic reference between script and its members
2020-09-10 01:26:07 +02:00

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/*************************************************************************/
/* gdscript_function.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef GDSCRIPT_FUNCTION_H
#define GDSCRIPT_FUNCTION_H
#include "core/os/thread.h"
#include "core/pair.h"
#include "core/reference.h"
#include "core/script_language.h"
#include "core/self_list.h"
#include "core/string_name.h"
#include "core/variant.h"
class GDScriptInstance;
class GDScript;
struct GDScriptDataType {
enum Kind {
UNINITIALIZED,
BUILTIN,
NATIVE,
SCRIPT,
GDSCRIPT,
};
Kind kind = UNINITIALIZED;
bool has_type = false;
Variant::Type builtin_type = Variant::NIL;
StringName native_type;
Script *script_type = nullptr;
Ref<Script> script_type_ref;
bool is_type(const Variant &p_variant, bool p_allow_implicit_conversion = false) const {
if (!has_type) {
return true; // Can't type check
}
switch (kind) {
case UNINITIALIZED:
break;
case BUILTIN: {
Variant::Type var_type = p_variant.get_type();
bool valid = builtin_type == var_type;
if (!valid && p_allow_implicit_conversion) {
valid = Variant::can_convert_strict(var_type, builtin_type);
}
return valid;
} break;
case NATIVE: {
if (p_variant.get_type() == Variant::NIL) {
return true;
}
if (p_variant.get_type() != Variant::OBJECT) {
return false;
}
Object *obj = p_variant.get_validated_object();
if (!obj) {
return false;
}
if (!ClassDB::is_parent_class(obj->get_class_name(), native_type)) {
// Try with underscore prefix
StringName underscore_native_type = "_" + native_type;
if (!ClassDB::is_parent_class(obj->get_class_name(), underscore_native_type)) {
return false;
}
}
return true;
} break;
case SCRIPT:
case GDSCRIPT: {
if (p_variant.get_type() == Variant::NIL) {
return true;
}
if (p_variant.get_type() != Variant::OBJECT) {
return false;
}
Object *obj = p_variant.get_validated_object();
if (!obj) {
return false;
}
Ref<Script> base = obj && obj->get_script_instance() ? obj->get_script_instance()->get_script() : nullptr;
bool valid = false;
while (base.is_valid()) {
if (base == script_type) {
valid = true;
break;
}
base = base->get_base_script();
}
return valid;
} break;
}
return false;
}
operator PropertyInfo() const {
PropertyInfo info;
if (has_type) {
switch (kind) {
case UNINITIALIZED:
break;
case BUILTIN: {
info.type = builtin_type;
} break;
case NATIVE: {
info.type = Variant::OBJECT;
info.class_name = native_type;
} break;
case SCRIPT:
case GDSCRIPT: {
info.type = Variant::OBJECT;
info.class_name = script_type->get_instance_base_type();
} break;
}
} else {
info.type = Variant::NIL;
info.usage |= PROPERTY_USAGE_NIL_IS_VARIANT;
}
return info;
}
GDScriptDataType() {}
};
class GDScriptFunction {
public:
enum Opcode {
OPCODE_OPERATOR,
OPCODE_EXTENDS_TEST,
OPCODE_IS_BUILTIN,
OPCODE_SET,
OPCODE_GET,
OPCODE_SET_NAMED,
OPCODE_GET_NAMED,
OPCODE_SET_MEMBER,
OPCODE_GET_MEMBER,
OPCODE_ASSIGN,
OPCODE_ASSIGN_TRUE,
OPCODE_ASSIGN_FALSE,
OPCODE_ASSIGN_TYPED_BUILTIN,
OPCODE_ASSIGN_TYPED_NATIVE,
OPCODE_ASSIGN_TYPED_SCRIPT,
OPCODE_CAST_TO_BUILTIN,
OPCODE_CAST_TO_NATIVE,
OPCODE_CAST_TO_SCRIPT,
OPCODE_CONSTRUCT, //only for basic types!!
OPCODE_CONSTRUCT_ARRAY,
OPCODE_CONSTRUCT_DICTIONARY,
OPCODE_CALL,
OPCODE_CALL_RETURN,
OPCODE_CALL_ASYNC,
OPCODE_CALL_BUILT_IN,
OPCODE_CALL_SELF_BASE,
OPCODE_AWAIT,
OPCODE_AWAIT_RESUME,
OPCODE_JUMP,
OPCODE_JUMP_IF,
OPCODE_JUMP_IF_NOT,
OPCODE_JUMP_TO_DEF_ARGUMENT,
OPCODE_RETURN,
OPCODE_ITERATE_BEGIN,
OPCODE_ITERATE,
OPCODE_ASSERT,
OPCODE_BREAKPOINT,
OPCODE_LINE,
OPCODE_END
};
enum Address {
ADDR_BITS = 24,
ADDR_MASK = ((1 << ADDR_BITS) - 1),
ADDR_TYPE_MASK = ~ADDR_MASK,
ADDR_TYPE_SELF = 0,
ADDR_TYPE_CLASS = 1,
ADDR_TYPE_MEMBER = 2,
ADDR_TYPE_CLASS_CONSTANT = 3,
ADDR_TYPE_LOCAL_CONSTANT = 4,
ADDR_TYPE_STACK = 5,
ADDR_TYPE_STACK_VARIABLE = 6,
ADDR_TYPE_GLOBAL = 7,
ADDR_TYPE_NAMED_GLOBAL = 8,
ADDR_TYPE_NIL = 9
};
struct StackDebug {
int line;
int pos;
bool added;
StringName identifier;
};
private:
friend class GDScriptCompiler;
friend class GDScriptByteCodeGenerator;
StringName source;
mutable Variant nil;
mutable Variant *_constants_ptr;
int _constant_count;
const StringName *_global_names_ptr;
int _global_names_count;
const int *_default_arg_ptr;
int _default_arg_count;
const int *_code_ptr;
int _code_size;
int _argument_count;
int _stack_size;
int _call_size;
int _initial_line;
bool _static;
MultiplayerAPI::RPCMode rpc_mode;
GDScript *_script;
StringName name;
Vector<Variant> constants;
Vector<StringName> global_names;
Vector<int> default_arguments;
Vector<int> code;
Vector<GDScriptDataType> argument_types;
GDScriptDataType return_type;
#ifdef TOOLS_ENABLED
Vector<StringName> arg_names;
#endif
List<StackDebug> stack_debug;
_FORCE_INLINE_ Variant *_get_variant(int p_address, GDScriptInstance *p_instance, GDScript *p_script, Variant &self, Variant &static_ref, Variant *p_stack, String &r_error) const;
_FORCE_INLINE_ String _get_call_error(const Callable::CallError &p_err, const String &p_where, const Variant **argptrs) const;
friend class GDScriptLanguage;
SelfList<GDScriptFunction> function_list;
#ifdef DEBUG_ENABLED
CharString func_cname;
const char *_func_cname;
struct Profile {
StringName signature;
uint64_t call_count;
uint64_t self_time;
uint64_t total_time;
uint64_t frame_call_count;
uint64_t frame_self_time;
uint64_t frame_total_time;
uint64_t last_frame_call_count;
uint64_t last_frame_self_time;
uint64_t last_frame_total_time;
} profile;
#endif
public:
struct CallState {
GDScript *script;
GDScriptInstance *instance;
#ifdef DEBUG_ENABLED
StringName function_name;
String script_path;
#endif
Vector<uint8_t> stack;
int stack_size;
Variant self;
uint32_t alloca_size;
int ip;
int line;
int defarg;
Variant result;
};
_FORCE_INLINE_ bool is_static() const { return _static; }
const int *get_code() const; //used for debug
int get_code_size() const;
Variant get_constant(int p_idx) const;
StringName get_global_name(int p_idx) const;
StringName get_name() const;
int get_max_stack_size() const;
int get_default_argument_count() const;
int get_default_argument_addr(int p_idx) const;
GDScriptDataType get_return_type() const;
GDScriptDataType get_argument_type(int p_idx) const;
GDScript *get_script() const { return _script; }
StringName get_source() const { return source; }
void debug_get_stack_member_state(int p_line, List<Pair<StringName, int>> *r_stackvars) const;
_FORCE_INLINE_ bool is_empty() const { return _code_size == 0; }
int get_argument_count() const { return _argument_count; }
StringName get_argument_name(int p_idx) const {
#ifdef TOOLS_ENABLED
ERR_FAIL_INDEX_V(p_idx, arg_names.size(), StringName());
return arg_names[p_idx];
#else
return StringName();
#endif
}
Variant get_default_argument(int p_idx) const {
ERR_FAIL_INDEX_V(p_idx, default_arguments.size(), Variant());
return default_arguments[p_idx];
}
Variant call(GDScriptInstance *p_instance, const Variant **p_args, int p_argcount, Callable::CallError &r_err, CallState *p_state = nullptr);
#ifdef DEBUG_ENABLED
void disassemble(const Vector<String> &p_code_lines) const;
#endif
_FORCE_INLINE_ MultiplayerAPI::RPCMode get_rpc_mode() const { return rpc_mode; }
GDScriptFunction();
~GDScriptFunction();
};
class GDScriptFunctionState : public Reference {
GDCLASS(GDScriptFunctionState, Reference);
friend class GDScriptFunction;
GDScriptFunction *function;
GDScriptFunction::CallState state;
Variant _signal_callback(const Variant **p_args, int p_argcount, Callable::CallError &r_error);
Ref<GDScriptFunctionState> first_state;
SelfList<GDScriptFunctionState> scripts_list;
SelfList<GDScriptFunctionState> instances_list;
protected:
static void _bind_methods();
public:
bool is_valid(bool p_extended_check = false) const;
Variant resume(const Variant &p_arg = Variant());
void _clear_stack();
GDScriptFunctionState();
~GDScriptFunctionState();
};
#endif // GDSCRIPT_FUNCTION_H
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