/***************************************************************************

  gbx_exec.c

  Subroutines for the interpreter : executing methods, native methods,
  the NEW operator, the casting operator, etc.

  (c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 1, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

***************************************************************************/

#define __GBX_EXEC_C

#include "gb_common.h"
#include "gb_error.h"
#include "gbx_type.h"

#include <unistd.h>
#include <sys/time.h>

#include "gb_limit.h"
#include "gbx_subr.h"
#include "gbx_stack.h"
#include "gbx_debug.h"

#include "gbx_string.h"
#include "gbx_date.h"
#include "gbx_array.h"

#include "gbx_c_collection.h"

#include "gbx_api.h"
#include "gbx_exec.h"

/* Current virtual machine state */
STACK_CONTEXT EXEC_current = { 0 };
/* Stack pointer */
VALUE *SP = NULL;
/* Current instruction opcode */
PCODE EXEC_code;
/* Temporary storage or return value of a native function */
VALUE TEMP;
/* Return value of a gambas function */
VALUE RET;
/* SUPER was used for this stack pointer */
VALUE *EXEC_super = NULL;
/* CPU endianness */
bool EXEC_big_endian;
/* Current iterator */
CENUM *EXEC_enum;

bool EXEC_debug = FALSE; // debugging mode
bool EXEC_arch = FALSE; // executing an archive
bool EXEC_fifo = FALSE; // debugging through a fifo
bool EXEC_keep_library = FALSE; // do not unload libraries

EXEC_HOOK EXEC_Hook = { NULL };
EXEC_FUNCTION EXEC;
bool EXEC_main_hook_done = FALSE;
int EXEC_return_value = 0;

void EXEC_init(void)
{
	char test[4];

	PC = NULL;
	BP = NULL;
	OP = NULL;
	CP = NULL;
	RP->type = T_VOID;

	test[0] = 0xAA;
	test[1] = 0xBB;
	test[2] = 0xCC;
	test[3] = 0xDD;

	EXEC_big_endian = *((uint *)test) == 0xAABBCCDDL;
	if (EXEC_big_endian)
		fprintf(stderr, "** WARNING: CPU is big endian\n");
	/*printf("%s endian\n", EXEC_big_endian ? "big" : "little");*/

	DATE_init();
}


void BORROW(VALUE *value)
{
	static void *jump[16] = {
		&&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE,
		&&__STRING, &&__NONE, &&__VARIANT, &&__NONE, &&__FUNCTION, &&__NONE, &&__NONE
		};

	TYPE type = value->type;

	if (TYPE_is_object(type))
	{
		OBJECT_REF(value->_object.object, "BORROW");
		return;
	}
	
	goto *jump[type];

__VARIANT:
	if (value->_variant.vtype == T_STRING)
		STRING_ref((*(char **)value->_variant.value));
	else if (TYPE_is_object(value->_variant.vtype))
		OBJECT_REF(*((void **)value->_variant.value), "BORROW");
	return;

__FUNCTION:
	OBJECT_REF(value->_function.object, "BORROW");
	return;

__STRING:
	STRING_ref(value->_string.addr);

__NONE:
	return;
}


void UNBORROW(VALUE *value)
{
	static void *jump[16] = {
		&&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE,
		&&__STRING, &&__NONE, &&__VARIANT, &&__NONE, &&__FUNCTION, &&__NONE, &&__NONE
		};

	TYPE type = value->type;

	if (TYPE_is_object(type))
	{
		OBJECT_UNREF_KEEP(value->_object.object, "UNBORROW");
		return;
	}
	
	goto *jump[type];

__VARIANT:
	if (value->_variant.vtype == T_STRING)
		STRING_unref_keep((char **)value->_variant.value);
	else if (TYPE_is_object(value->_variant.vtype))
		OBJECT_UNREF_KEEP(*((void **)value->_variant.value), "UNBORROW");
	return;

__FUNCTION:
	OBJECT_UNREF_KEEP(value->_function.object, "UNBORROW");
	return;

__STRING:
	STRING_unref_keep(&value->_string.addr);

__NONE:
	return;
}


void RELEASE(VALUE *value)
{
	static void *jump[16] = {
		&&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE,
		&&__STRING, &&__NONE, &&__VARIANT, &&__ARRAY, &&__FUNCTION, &&__NONE, &&__NONE
		};

	TYPE type = value->type;

	if (TYPE_is_object(type))
	{
		OBJECT_UNREF(value->_object.object, "RELEASE");
		return;
	}
	
	goto *jump[type];

__VARIANT:
	if (value->_variant.vtype == T_STRING)
		STRING_unref((char **)value->_variant.value);
	else if (TYPE_is_object(value->_variant.vtype))
		OBJECT_UNREF(*((void **)value->_variant.value), "RELEASE");
	return;

__FUNCTION:
	OBJECT_UNREF(value->_function.object, "RELEASE");
	return;

__ARRAY:
	if (!value->_array.keep)
		ARRAY_free(&value->_array.addr, (ARRAY_DESC *)value->_array.class->load->array[value->_array.index]);
	return;

__STRING:
	STRING_unref(&value->_string.addr);

__NONE:
	return;
}

void RELEASE_many(VALUE *value, int n)
{
	static void *jump[16] = {
		&&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE,
		&&__STRING, &&__NONE, &&__VARIANT, &&__ARRAY, &&__FUNCTION, &&__NONE, &&__NONE
		};

	TYPE type;
	
	while (n)
	{
		n--;
		value--;
		
		type = value->type;
	
		if (TYPE_is_object(type))
		{
			OBJECT_UNREF(value->_object.object, "RELEASE");
			continue;
		}
		
		goto *jump[type];
	
	__VARIANT:
		if (value->_variant.vtype == T_STRING)
			STRING_unref((char **)value->_variant.value);
		else if (TYPE_is_object(value->_variant.vtype))
			OBJECT_UNREF(*((void **)value->_variant.value), "RELEASE");
		continue;
	
	__FUNCTION:
		OBJECT_UNREF(value->_function.object, "RELEASE");
		continue;
	
	__ARRAY:
	if (!value->_array.keep)
		ARRAY_free(&value->_array.addr, (ARRAY_DESC *)value->_array.class->load->array[value->_array.index]);
		continue;
	
	__STRING:
		STRING_unref(&value->_string.addr);
	
	__NONE:
		continue;
	}
}

#if 0
void DUMP(VALUE *value)
{
	static void *jump[16] = {
		&&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE, &&__NONE,
		&&__STRING, &&__NONE, &&__VARIANT, &&__ARRAY, &&__NONE, &&__FUNCTION, &&__NONE, &&__NONE
		};

	TYPE type = value->type;

	printf("type = %p / ", (void *)type);

	if (TYPE_is_object(type))
		goto __OBJECT;
	else
		goto *jump[type];

__STRING:
	printf("STRING %p\n", value->_string.addr);
	return;

__OBJECT:
	if (value->_object.object)
	{
		printf("OBJECT (%p)\n", value->_object.object);
		printf("-> %s\n", OBJECT_class(value->_object.object)->name);
	}
	else
		printf("OBJECT (NULL)\n");
	return;

__VARIANT:
	if (value->_variant.vtype == T_STRING)
		printf("STRING %p\n", *((char **)value->_variant.value));
	else if (TYPE_is_object(value->_variant.vtype))
		printf("OBJECT (%s %p)\n", OBJECT_class(*((void **)value->_variant.value))->name, *((void **)value->_variant.value));
	return;

__FUNCTION:
	printf("FUNCTION %s (%s %p)\n", value->_function.class->name, OBJECT_class(value->_function.object)->name, value->_function.object);
	return;

__ARRAY:
	printf("ARRAY\n");
	return;

__NONE:
	printf("\n");
	return;
}
#endif

void EXEC_release_return_value(void)
{
	RELEASE(RP);
	RP->type = T_VOID;
}


#define print_register() \
	printf("| SP = %d  BP = %d  FP = %p  PC = %p  EC = %p\n", SP - (VALUE *)STACK_base, BP - (VALUE *)STACK_base, FP, PC, EC)

static bool exec_enter_can_quick(void)
{
	int i;
	FUNCTION *func;
	int nparam = EXEC.nparam;

	func = &EXEC.class->load->func[EXEC.index];

	/* check number of arguments */

	if (func->npmin < func->n_param || nparam != func->n_param || func->vararg)
		return FALSE;

	/* check arguments type */

	for (i = 0; i < nparam; i++)
	{
		if (SP[i - nparam].type != func->param[i].type)
			return FALSE;
	}

	return TRUE;
}

void EXEC_enter(void)
{
	int i;
	FUNCTION *func; // = EXEC.func;
	int nparam = EXEC.nparam;
	void *object = EXEC.object;
	CLASS *class = EXEC.class;

	#if DEBUG_STACK
	printf("\n| >> EXEC_enter(%s, %ld, %d)\n", EXEC.class->name, EXEC.index, nparam);
	print_register();
	#endif

	/*
	func_id = value->index;

	if (value->kind & FUNCTION_PUBLIC)
		func_id = (int)(class->table[func_id].desc.method->exec;

	*/

	func = &class->load->func[EXEC.index];
	#if DEBUG_STACK
	if (func->debug)
		printf(" | >> %s\n", func->debug->name);
	#endif

	/* check number of arguments */

	if (nparam < func->npmin)
		THROW(E_NEPARAM);
	else if (nparam > func->n_param && !func->vararg)
		THROW(E_TMPARAM);

	/* mandatory arguments */

	for (i = 0; i < func->npmin; i++)
	{
		VALUE_conv(SP - nparam + i, func->param[i].type);
		/*BORROW(SP - nparam + i);*/
	}

	if (func->npmin < func->n_param)
	{
		/* optional arguments */

		for (i = func->npmin; i < nparam; i++)
		{
			if (SP[- nparam + i].type == T_VOID)
				SP[- nparam + i]._void.ptype = func->param[i].type;
			else
			{
				VALUE_conv(SP - nparam + i, func->param[i].type);
				/*BORROW(SP - nparam + i);*/
			}
		}

		/* missing optional arguments */

		if (nparam < func->n_param)
		{
			STACK_check(func->n_param - nparam);

			for (i = nparam; i < func->n_param; i++)
			{
				SP->type = T_VOID;
				SP->_void.ptype = func->param[i].type;
				SP++;
			}
		}
	}

	/* save context */

	STACK_push_frame(&EXEC_current);

	/* check stack */

	STACK_check(func->stack_usage);

	/* enter function */

	BP = SP;
	if (func->vararg)
		PP = SP - (nparam - func->n_param);
	else
		PP = SP;
	FP = func;
	PC = func->code;
	OP = object;
	CP = class;
	//AP = ARCH_from_class(CP);
	EP = NULL;

	if (func->error)
	{
		#if DEBUG_ERROR
			printf("EXEC_enter: EC = PC + %d\n", func->error);
		#endif
		EC = PC + func->error;
	}
	else
		EC = NULL;

	/* reference the object so that it is not destroyed during the function call */
	OBJECT_REF(OP, "EXEC_enter");

	/*printf("PC = %p  nparam = %d\n", PC, FP->n_param);*/

	/* local variables initialization */

	if (func->n_local)
	{
		for (i = 0; i < func->n_local; i++)
		{
			VALUE_class_default(class, SP, func->local[i].type);
			SP++;
		}
	}

	/* control variables initialization */

	if (func->n_ctrl)
	{
		for (i = 0; i < func->n_ctrl; i++)
		{
			SP->type = T_VOID;
			SP++;
		}
	}

	/*printf("EXEC_enter: nparam = %d  nlocal = %d  nctrl = %d\n", func->n_param, func->n_local, func->n_ctrl);*/

	RP->type = T_VOID;

	#if DEBUG_STACK
	printf("| << EXEC_enter()\n");
	print_register();
	#endif
}


void EXEC_enter_check(bool defined)
{
	if (defined && exec_enter_can_quick())
		*PC = (*PC & 0xFF) | C_CALL_QUICK;
	else
		*PC = (*PC & 0xFF) | C_CALL_NORM;

	EXEC_enter();
}


void EXEC_enter_quick(void)
{
	int i;
	FUNCTION *func;;
	void *object = EXEC.object;
	CLASS *class = EXEC.class;

	#if DEBUG_STACK
	printf("\n| >> EXEC_enter(%s, %ld, %d)\n", EXEC.class->name, EXEC.index, EXEC.nparam);
	print_register();
	#endif

	func = &class->load->func[EXEC.index];
	#if DEBUG_STACK
	if (func->debug)
		printf(" | >> %s\n", func->debug->name);
	#endif

	/* save context */

	STACK_push_frame(&EXEC_current);

	/* check stack */

	STACK_check(func->stack_usage);

	/* enter function */

	BP = SP;
	PP = SP;
	FP = func;
	PC = func->code;
	OP = object;
	CP = class;
	EP = NULL;

	if (func->error)
		EC = PC + func->error;
	else
		EC = NULL;

	/* reference the object so that it is not destroyed during the function call */
	OBJECT_REF(OP, "EXEC_enter");

	/* local variables initialization */

	if (func->n_local)
	{
		for (i = 0; i < func->n_local; i++)
		{
			VALUE_class_default(class, SP, func->local[i].type);
			SP++;
		}
	}

	/* control variables initialization */

	if (func->n_ctrl)
	{
		for (i = 0; i < func->n_ctrl; i++)
		{
			SP->type = T_VOID;
			SP++;
		}
	}

	RP->type = T_VOID;

	#if DEBUG_STACK
	printf("| << EXEC_enter()\n");
	print_register();
	#endif
}


void EXEC_leave(bool drop) //bool keep_ret_value)
{
	int n;
	bool keep_ret_value = FALSE;
	VALUE ret;

#if DEBUG_STACK
	printf("| >> EXEC_leave\n");
	print_register();
#endif

	/* Sauvegarde de la valeur de retour.

		Car elle peut �re �ras� par un _free() g���par un
		OBJECT_UNREF
	*/

	ret = *RP;

	/* Lib�ation des variables locales et de controle et des arguments */

	n = FP->n_param + (SP - PP);

	//for (i = 0; i < n; i++)
	//  POP();
	
	RELEASE_MANY(SP, n);

	/* On lib�e l'objet reserv�dans EXEC_enter() */
	OBJECT_UNREF(OP, "EXEC_leave");

	/* restitution du contexte */

	STACK_pop_frame(&EXEC_current);
	//AP = ARCH_from_class(CP);

	//printf("EXEC_leave: PC = %p\n", PC);

	if (PC && !drop)
	{
		drop = PCODE_is_void(*PC);
		/*if (SP[-1].type != T_FUNCTION)
		{
			printf("EXEC_leave: type != T_FUNCTION\n");
			POP();
		}
		else*/
		if (SP[-1].type == T_FUNCTION)
		{
			SP--;
			OBJECT_UNREF(SP->_function.object, "EXEC_leave");
		}
		/*output = PCODE_is_output(*PC);*/
	}
	else
	{
		drop = TRUE;
		keep_ret_value = TRUE;
	}

	/* lib�ation de la pile utilis� */

	/*
		Attention ! le RELEASE(RP) conjugu�au UNBORROW(RP)
		peut faire descendre le compteur de r��ence d'un objet �-1 !
	*/

	/*
		NOTE: les param�res input-output ont le m�e probl�e que la
		valeur de retour. Ils peuvent contenir des r��ences d�allou�s !
		A CORRIGER ! En attendant, ils sont d�activ�.
	*/

#if DEBUG_REF
	printf("EXEC_leave: return\n");
#endif

	if (!drop)
	{
		//*SP = ret;
		COPY_VALUE(SP, &ret);
		RP->type = T_VOID;
		if (PCODE_is_variant(*PC))
			VALUE_conv(SP, T_VARIANT);
		SP++;
	}
	else if (!keep_ret_value)
		EXEC_release_return_value();

#if DEBUG_STACK
	printf("| << EXEC_leave()\n");
	print_register();
	printf("\n");
#endif
}


void EXEC_function_real()
{
	// We need to push a void frame, because EXEC_leave looks at *PC to know if a return value is expected
	STACK_push_frame(&EXEC_current);

	PC = NULL;

	TRY
	{
		EXEC_enter();
	}
	CATCH
	{
		STACK_pop_frame(&EXEC_current);
		PROPAGATE();	
	}
	END_TRY

	EXEC_function_loop();
}

void EXEC_function_loop()
{
	bool retry = FALSE;

	if (PC != NULL)
	{
		do
		{
			TRY
			{
				EXEC_loop();
				retry = FALSE;
			}
			CATCH
			{
				// QUIT was called
				if (ERROR_info.code == E_ABORT)
				{
					#if DEBUG_ERROR
					printf("#0 QUIT\n");
					#endif
					ERROR_lock();
					while (PC != NULL)
						EXEC_leave(TRUE);
					ERROR_unlock();

					//STACK_pop_frame(&EXEC_current);
					PROPAGATE();
				}
				// We are in a TRY
				else if (EP != NULL)
				{
					#if DEBUG_ERROR
					printf("#1 EP = %d  SP = %d\n", EP - (VALUE *)STACK_base, SP - (VALUE *)STACK_base);
					#endif

					while (SP > EP)
						POP();

					PC = EC;
					EP = NULL;
					retry = TRUE;
					/* On va directement sur le END TRY */
				}
				// There is a CATCH in the function
				else if (EC != NULL)
				{
					#if DEBUG_ERROR
					printf("#2 EC = %p\n", EC);
					#endif

					PC = EC;
					EC = NULL;
					retry = TRUE;
				}
				// There is no event handler in the function
				else
				{
					#if DEBUG_ERROR
					printf("#3\n");
					#endif

					if (EXEC_debug && !STACK_has_error_handler())
					{
						if (TP && TC)
						{
							ERROR_lock();
							while (BP > TP)
							{
								EXEC_leave(TRUE);
								if (!PC)
									STACK_pop_frame(&EXEC_current);
							}
							while (SP > TP)
							{
								POP();
							}
							PC = TC;
							ERROR_unlock();
						}

						DEBUG.Main(TRUE);
						retry = TRUE;
					}
					else
					{
						ERROR_lock();
						while (PC != NULL && EC == NULL)
							EXEC_leave(TRUE);
						ERROR_unlock();

						if (PC == NULL)
						{
							/*printf("try to propagate\n");*/
							STACK_pop_frame(&EXEC_current);
							PROPAGATE();

							/*ERROR_print();
							exit(1);*/
							/*retry = FALSE;*/
						}

						if (EP != NULL)
						{
							#if DEBUG_ERROR
							printf("#1 EP = %d  SP = %d\n", EP - (VALUE *)STACK_base, SP - (VALUE *)STACK_base);
							#endif

							ERROR_lock();
							while (SP > EP)
								POP();
							ERROR_unlock();

							EP = NULL;
							/* On va directement sur le END TRY */
						}

						PC = EC;
						EC = NULL;

						retry = TRUE;
					}
				}

				while (SP < EXEC_super)
					EXEC_super = ((VALUE *)EXEC_super)->_object.super;
			}
			END_TRY

			#if DEBUG_ERROR
			if (retry)
				printf("retry %p\n", PC);
			#endif
		}
		while (retry);
	}

	STACK_pop_frame(&EXEC_current);
	/*PC = save;*/
}


bool EXEC_call_native(void (*exec)(), void *object, TYPE type, VALUE *param)
{
	TYPE save = GAMBAS_ReturnType;
	GAMBAS_Error = FALSE;

	GAMBAS_ReturnType = type;
	//TEMP.type = T_NULL;

	/*OBJECT_REF(object, "EXEC_call_native"); N'est plus n�essaire ! */
	(*exec)(object, (void *)param);
	/*OBJECT_UNREF(object, "EXEC_call_native");*/

	GAMBAS_ReturnType = save;
	if (GAMBAS_Error)
	{
		GAMBAS_Error = FALSE;
		return TRUE;
	}
	else
		return FALSE;
}


void EXEC_native(void)
{
	CLASS_DESC_METHOD *desc = EXEC.desc;
	bool drop = EXEC.drop;
	int nparam = EXEC.nparam;
	bool use_stack = EXEC.use_stack;
	void *object = EXEC.object;

	int i; /* ,j */
	VALUE *value;
	TYPE *sign;
	bool error;
	void *free = NULL;
	int n;
	VALUE ret;

	/* v�ification des param�res */

	#if DEBUG_STACK
	printf("| >> EXEC_native: %s.%s (%p)\n", EXEC.class->name, desc->name, &desc);
	#endif

	//printf("EXEC_native: nparam = %d desc->npvar = %d\n", nparam, desc->npvar);

	if (nparam < desc->npmin)
		THROW(E_NEPARAM);

	if (!desc->npvar)
	{
		if (nparam > desc->npmax)
			THROW(E_TMPARAM);

		value = &SP[-nparam];
		sign = desc->signature;

		for (i = 0; i < desc->npmin; i++, value++, sign++)
			VALUE_conv(value, *sign);

		if (desc->npmin < desc->npmax)
		{
			for (; i < nparam; i++, value++, sign++)
			{
				if (value->type != T_VOID)
					VALUE_conv(value, *sign);
			}

			n = desc->npmax - nparam;

			STACK_check(n);
			SP += n;
			nparam = desc->npmax;

			for (; i < nparam; i++, value++)
				value->type = T_VOID;
		}
	}
	else
	{
		value = &SP[-nparam];
		sign = desc->signature;

		for (i = 0; i < desc->npmin; i++, value++, sign++)
			VALUE_conv(value, *sign);

		if (desc->npmin < desc->npmax)
		{
			if (nparam < desc->npmax)
			{
				for (; i < nparam; i++, value++, sign++)
				{
					if (value->type != T_VOID)
						VALUE_conv(value, *sign);
				}

				n = desc->npmax - nparam;

				STACK_check(n);
				SP += n;
				nparam = desc->npmax;

				for (; i < nparam; i++, value++)
					value->type = T_VOID;
			}
			else
			{
				for (; i < desc->npmax; i++, value++, sign++)
				{
					if (value->type != T_VOID)
						VALUE_conv(value, *sign);
				}
			}
		}

		if (desc->npmax < nparam)
			EXEC.nparvar = nparam - desc->npmax;
		else
			EXEC.nparvar = 0;

		for (; i < nparam; i++, value++)
			VARIANT_undo(value);

		//printf("EXEC_native: nparvar = %d\n", EXEC.nparvar);
	}

	error = EXEC_call_native(desc->exec, object, desc->type, &SP[-nparam]);
	COPY_VALUE(&ret, &TEMP);

	/* Lib�ation des arguments */

	/*while (nparam > 0)
	{
		nparam--;
		POP();
	}*/
	
	RELEASE_MANY(SP, nparam);
	
	/* Si la description de la fonction se trouve sur la pile */

	if (use_stack)
	{
		SP--;
		free = SP->_function.object;
		SP->type = T_NULL;
	}

	/*
	#if DEBUG_STACK
	else
		printf("** SP != func SP = %p func = %p **\n>", SP, func);
	#endif
	*/

	if (!error)
	{
		if (desc->type == T_VOID)
		{
			if (!drop)
			{
				SP->type = T_VOID;
				SP->_void.ptype = T_NULL;
				SP++;
			}
		}
		else
		{
			BORROW(&ret);

			if (drop)
				RELEASE(&ret);
			else
			{
				VALUE_conv(&ret, desc->type);
				//*SP = ret;
				COPY_VALUE(SP, &ret);
				SP++;
			}
		}
	}

	if (use_stack)
		OBJECT_UNREF(free, "EXEC_native (FUNCTION)");

	if (error)
		PROPAGATE();

	#if DEBUG_STACK
	printf("| << EXEC_native: %s (%p)\n", desc->name, &desc);
	#endif
}


void EXEC_object(VALUE *val, CLASS **pclass, OBJECT **pobject, bool *pdefined)
{
	static void *jump[] = {
		&&__ERROR, &&__ERROR, &&__ERROR, &&__ERROR, &&__ERROR, &&__ERROR, &&__ERROR, &&__ERROR, &&__ERROR,
		&&__ERROR, &&__ERROR, &&__VARIANT, &&__ERROR, &&__FUNCTION, &&__CLASS, &&__NULL,
		&&__OBJECT
		};

	CLASS *class;
	OBJECT *object;
	bool defined;

__RETRY:

	if (TYPE_is_pure_object(val->type))
		goto __PURE_OBJECT;
	else
		goto *jump[val->type];

__FUNCTION:

	if (val->_function.kind == FUNCTION_UNKNOWN)
	{
		EXEC.property = TRUE;
		EXEC.unknown = CP->load->unknown[val->_function.index];

		EXEC_special(SPEC_UNKNOWN, val->_function.class, val->_function.object, 0, FALSE);

		object = val->_function.object;
		OBJECT_UNREF(object, "EXEC_object (FUNCTION)");

		SP--;
		//*val = *SP;
		COPY_VALUE(val, SP);
		goto __RETRY;
	}
	else
		goto __ERROR;

__CLASS:

	class = val->_class.class;
	object = NULL;
	defined = TRUE;

	if (val == EXEC_super)
	{
		EXEC_super = val->_object.super;
		//*class = (*class)->parent;
		if (!class)
			THROW(E_PARENT);
	}
	CLASS_load(class);
	goto __RETURN;

__OBJECT:

	object = val->_object.object;
	class = OBJECT_class(object);
	defined = FALSE;

	goto __CHECK;

__PURE_OBJECT:

	object = val->_object.object;
	class = val->_object.class;
	defined = TRUE;

	if (val == EXEC_super)
	{
		EXEC_super = val->_object.super;
		//*class = (*class)->parent;
		if (!class)
			THROW(E_PARENT);
	}
	else if (!class->is_virtual)
		class = OBJECT_class(object);
	else if (!object)
	{
		/* A null object and a virtual class means that we want to pass a static class */
		CLASS_load(class);
		goto __RETURN;
	}

	goto __CHECK;

__VARIANT:

	if (val->_variant.vtype == T_OBJECT)
	{
		object = *((void **)val->_variant.value);
		class = OBJECT_class(object);
		defined = FALSE;
		goto __CHECK;
	}
	else if (TYPE_is_object(val->_variant.vtype))
	{
		object = *((void **)val->_variant.value);
		class = (CLASS *)val->_variant.vtype;
		if (!class->is_virtual)
			class = OBJECT_class(object); /* Virtual dispatching */
		defined = FALSE;
		goto __CHECK;
	}
	else
		goto __ERROR;

__ERROR:

	THROW(E_NOBJECT);

__NULL:

	THROW(E_NULL);

__CHECK:

	if (!object)
		goto __NULL;

	CLASS_load(class);

	if (class->check && (*(class->check))(object))
		THROW(E_IOBJECT);
		
__RETURN:

	*pclass = class;
	*pobject = object;
	*pdefined = defined;
}


void EXEC_public(CLASS *class, void *object, const char *name, int nparam)
{
	CLASS_DESC *desc;

	desc = CLASS_get_symbol_desc_kind(class, name, (object != NULL) ? CD_METHOD : CD_STATIC_METHOD, 0);

	if (desc == NULL)
		return;

	EXEC.class = desc->method.class;
	EXEC.object = object;
	EXEC.nparam = nparam;
	EXEC.drop = TRUE;

	if (FUNCTION_is_native(&desc->method))
	{
		EXEC.desc = &desc->method;
		EXEC.use_stack = FALSE;
		EXEC_native();
	}
	else
	{
		EXEC.index = (int)(intptr_t)desc->method.exec;
		//EXEC.func = &class->load->func[(long)desc->method.exec]
		EXEC_function();
	}
}



bool EXEC_spec(int special, CLASS *class, void *object, int nparam, bool drop)
{
	CLASS_DESC *desc;
	short index = class->special[special];

	if (index == NO_SYMBOL)
		return TRUE;

	desc = CLASS_get_desc(class, index);

	if (CLASS_DESC_get_type(desc) == CD_STATIC_METHOD)
	{
		if (object != NULL)
			return TRUE;
	}
	else
	{
		if (object == NULL)
		{
			if (class->auto_create)
				object = EXEC_auto_create(class, FALSE);

			if (object == NULL)
				THROW(E_NOBJECT);
		}
	}

	EXEC.class = desc->method.class;
	EXEC.object = object;
	EXEC.nparam = nparam;
	EXEC.drop = drop;

	/*printf("<< EXEC_spec: SP = %d\n", SP - (VALUE *)STACK_base);
	save_SP = SP;*/

	if (FUNCTION_is_native(&desc->method))
	{
		EXEC.desc = &desc->method;
		EXEC.use_stack = FALSE;
		EXEC.native = TRUE;
		EXEC_native();
	}
	else
	{
		//EXEC.func = &class->load->func[(long)desc->method.exec]
		EXEC.index = (int)(intptr_t)desc->method.exec;
		EXEC.native = FALSE;
		EXEC_function_real(!drop);
		if (!drop)
		{
			//*SP++ = *RP;
			COPY_VALUE(SP, RP);
			SP++;
			RP->type = T_VOID;
		}
	}

	/*printf(">> EXEC_spec: SP = %d\n", SP - (VALUE *)STACK_base);
	if (SP != save_SP)
		printf("**** SP should be %d\n", save_SP - (VALUE *)STACK_base);*/

	return FALSE;
}


/* static void dump(int np) */
/* { */
/*   int i; */
/*  */
/*   for (i = 1; i <= np; i++) */
/*     printf("SP[%d] = %d  ", -i, SP[-i].type); */
/*  */
/*   printf("\n"); */
/* } */
/*  */

/*
	The highest parent method is called first, but get only the parameters
	not consumed by the child methods.
*/

void EXEC_special_inheritance(int special, CLASS *class, OBJECT *object, int nparam, boolean drop)
{
	CLASS *her[MAX_INHERITANCE];
	int npher[MAX_INHERITANCE];
	int nher;
	int i, np;
	CLASS_DESC *desc;
	short index;

	/*if (class->parent != NULL)
		EXEC_special_inheritance(special, class->parent, object, 0, drop);*/

	nher = CLASS_get_inheritance(class, her);

	for(i = 0, np = 0; i < nher; i++)
	{
		class = her[i];
		npher[i] = np;

		index = class->special[special];
		if (index == NO_SYMBOL)
			continue;
		desc = CLASS_get_desc(class, index); //class->special[special];

		np += desc->method.npmax;
	}

	for(;;)
	{
		nher--;
		if (nher < 0)
			break;
		class = her[nher];

		if (special == SPEC_NEW)
		{
			if (!CLASS_is_native(class))
			{
				EXEC.class = class;
				EXEC.object = object;
				EXEC.index = FUNC_INIT_DYNAMIC;
				//EXEC.func = &class->load->func[FUNC_INIT_DYNAMIC];
				EXEC.native = FALSE;
				EXEC.nparam = 0;

				EXEC_function();
			}
		}

		index = class->special[special];
		if (index == NO_SYMBOL)
			continue;

		desc = CLASS_get_desc(class, index); // class->special[special];

		/*np = Min(nparam, desc->method.npmax);*/

		np = Max(0, nparam - npher[nher]);

		EXEC_special(special, class, object, np, drop);
		nparam -= np;
	}
}

void *EXEC_create_object(CLASS *class, int np, char *event)
{
	void *object;

	CLASS_load(class);

	if (class->no_create)
		THROW(E_CSTATIC, class->name);

	OBJECT_new(&object, class, event, ((OP == NULL) ? (OBJECT *)CP : (OBJECT *)OP));

	TRY
	{
		OBJECT_lock(object, TRUE);
		EXEC_special_inheritance(SPEC_NEW, class, object, np, TRUE);
		OBJECT_lock(object, FALSE);

//     SP--; /* class */
// 
//     SP->_object.class = class;
//     SP->_object.object = object;
//     SP++;
	}
	CATCH
	{
		// _free() methods should not be called, but we must
		OBJECT_UNREF(object, "EXEC_new");
		PROPAGATE();
//     SP--; /* class */
//     SP->type = T_NULL;
//     SP++;
//     PROPAGATE();
	}
	END_TRY

	return object;
}


void EXEC_new(void)
{
	CLASS *class;
	int np;
	boolean event;
	void *object;
	char *name = NULL;
	char *cname = NULL;

	np = *PC & 0xFF;
	event = np & CODE_NEW_EVENT;
	np &= 0x3F;

	/* Instanciation */

	SP -= np;

	if (SP->type == T_CLASS)
	{
		class = SP->_class.class;
	}
	else if (TYPE_is_string(SP->type))
	{
		STRING_copy_from_value_temp(&cname, SP);
		class = CLASS_find(cname);
		RELEASE(SP);
		SP->type = T_NULL;
	}
	else
		THROW(E_TYPE, "String", TYPE_get_name(SP->type));

	SP += np;

	//printf("**** NEW %s\n", class->name);
	CLASS_load(class);

	if (class->no_create)
		THROW(E_CSTATIC, class->name);

	if (event)
	{
		SP--;

		if (!TYPE_is_string(SP->type))
			THROW(E_TYPE, "String", TYPE_get_name(SP->type));

		STRING_copy_from_value_temp(&name, SP);
		//printf("**** name %s\n", class->name);

		STRING_ref(name);
		OBJECT_new(&object, class, name, ((OP == NULL) ? (OBJECT *)CP : (OBJECT *)OP));
		STRING_unref(&name);

		RELEASE(SP);

		np -= 2;
	}
	else
	{
		OBJECT_new(&object, class, name, ((OP == NULL) ? (OBJECT *)CP : (OBJECT *)OP));
		np--;
	}

	/*OBJECT_REF(object, "EXEC_new");*/

	/* On retourne l'objet cr� */

	TRY
	{
		OBJECT_lock(object, TRUE);
		EXEC_special_inheritance(SPEC_NEW, class, object, np, TRUE);
		OBJECT_lock(object, FALSE);

		SP--; /* class */

		SP->_object.class = class;
		SP->_object.object = object;
		SP++;
	}
	CATCH
	{
		// _free() methods should not be called, but we must
		OBJECT_UNREF(object, "EXEC_new");
		//(*class->free)(class, object);
		SP--; /* class */
		SP->type = T_NULL;
		SP++;
		PROPAGATE();
	}
	END_TRY

	/*  PUSH(); */

	/* L'objet a ��cr� avec un nombre de r��ence �al �1.
		On remet ce nombre �0 maintenant que l'objet est pr�.
		Mais on ne le d�ruit pas ! */

	/* OBJECT_UNREF(object, "EXEC_new"); */
}

#if 0
void EXEC_class(void)
{
	//fprintf(stderr, ">> EXEC_class: SP = %d  drop = %d\n", SP - (VALUE *)STACK_base, EXEC.drop);

	if (EXEC_special(SPEC_CALL, EXEC.class, EXEC.object, EXEC.nparam, EXEC.drop))
	{
		if (EXEC.nparam < 1)
			THROW(E_NEPARAM);
		else if (EXEC.nparam > 1)
			THROW(E_TMPARAM);

		VALUE_conv(SP - 1, (TYPE)EXEC.class);
	}
	else
	{
		#if 0
		if (RP->type != T_VOID) /* Ceci est fait pour un EXEC_native, mais pas pour un EXEC_function */
		{
			BORROW(RP);
			SP[-1] = *RP; /* On �rase la classe */
			EXEC_release_return_value();
		}
		else
			POP(); /* On enl�e la classe */
		#endif
		/* Class is replaced by return value */
		if (!EXEC.drop)
		{
			VALUE swap;

			swap = SP[-2];
			SP[-2] = SP[-1];
			SP[-1] = swap;
		}
	}

	//fprintf(stderr, "<< EXEC_class: SP = %d\n\n", SP - (VALUE *)STACK_base);
}
#endif


void EXEC_ILLEGAL(void)
{
	THROW(E_ILLEGAL);
}


void EXEC_quit(void)
{
	GAMBAS_DoNotRaiseEvent = TRUE;

	HOOK(quit)();

	THROW(E_ABORT);
}

void *EXEC_auto_create(CLASS *class, bool ref)
{
	void *object;

	object = CLASS_auto_create(class, 0); /* object is checked by CLASS_auto_create */
	if (ref)
		OBJECT_REF(object, "EXEC_auto_create");
	return object;
}

void EXEC_dup(int n)
{
	VALUE *src;
	
	STACK_check(n);
	
	src = SP - n;
	while (n > 0)
	{
		BORROW(src);
		*SP++ = *src++;
		n--;
	}
}