/*
 *  SPL - The SPL Programming Language
 *  Copyright (C) 2004, 2005  Clifford Wolf <clifford@clifford.at>
 *
 *  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 2 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  dump.c: Dump the SPL VM state
 */

#include <stdio.h>
#include <sys/types.h>
#include <utime.h>

#ifdef ENABLE_PTHREAD_SUPPORT
#include <pthread.h>
#endif

#include "spl.h"

static int dump_roof;
static int dump_counter;
static int dump_pass;

static FILE *dump_file;

static struct spl_vm *dump_vm_ptr;

#ifdef ENABLE_PTHREAD_SUPPORT
static pthread_mutex_t dump_lck = PTHREAD_MUTEX_INITIALIZER;
#endif

static void print_string(char *string)
{
	unsigned char *ustring = (unsigned char *)string;

	fputc('(', dump_file);
	for (int i=0; ustring[i]; i++)
		switch (ustring[i]) {
			case 'a' ... 'z':
			case 'A' ... 'Z':
			case '0' ... '9':
			case ':': case '#':
			case '+': case '-':
			case '_': case ',':
			case '.': case ' ':
				fputc(ustring[i], dump_file);
				break;
			default:
				fprintf(dump_file, "%%%02X", ustring[i]);
		}
	fputc(')', dump_file);
}

static void print_data(unsigned char *data, int size)
{
	fputc('{', dump_file);
	for (int i=0; i<size; i++)
		fprintf(dump_file, "%02X", data[i]);
	fputc('}', dump_file);
}

static void dump_code(struct spl_code *code)
{
	const char *sha1;

	if ( !code ) return;

	if ( dump_pass ) {
		if (code->dump_tag != 1) return;
		code->dump_tag = dump_counter++;
	} else {
		if (code->dump_tag == 1) return;
		code->dump_tag = 1;
		dump_roof++;
	}

	if ( dump_pass ) {
		fprintf(dump_file, "CODE=%d CODE_TYPE=%d SIZE=%d ID=",
			code->dump_tag, code->code_type, code->size);
		if ( code->id )
			fprintf(dump_file, "(%s)", code->id);
		fprintf(dump_file, " SHAONE=");
		if ( (sha1=spl_code_sha1(code)) != 0 )
			fprintf(dump_file, "(%s)", sha1);
		fprintf(dump_file, " CODE=");
		if ( sha1 && dump_vm_ptr->codecache_dir ) {
			int fn_size = strlen(dump_vm_ptr->codecache_dir) + 100;
			char fn[fn_size];

			snprintf(fn, fn_size, "%s/%s.splb",
					dump_vm_ptr->codecache_dir, sha1);

			if (utime(fn, NULL) != 0) {
				FILE *f = fopen(fn, "wb");
				if (f) {
					fwrite(code->code, code->size, 1, f);
					fclose(f);
				} else
					goto cant_open_code_dump_file;
			}
		} else {
cant_open_code_dump_file:;
			if ( code->code )
				print_data(code->code, code->size);
		}
		fprintf(dump_file, "\n");
	}
}

static void dump_node(struct spl_node *node)
{
	if ( !node ) return;

	if ( dump_pass ) {
		if (node->dump_tag != 1) return;
		node->dump_tag = dump_counter++;
	} else {
		if (node->dump_tag == 1) return;
		if (node->hnode_name)
			spl_hnode_dump(dump_vm_ptr, node);
		node->dump_tag = 1;
		dump_roof++;
	}

	dump_node(node->ctx);
	dump_node(node->cls);
	dump_code(node->code);

	struct spl_node_sub *s = node->subs_begin;
	while (s) {
		dump_node(s->node);
		s = s->next;
	}

	if ( dump_pass ) {
		fprintf(dump_file, "NODE=%d FLAGS=%d CLS=%d CTX=%d CTX_TYPE=%d CODE=%d CODE_IP=%d NIDX=%d SUBS=",
			node->dump_tag, node->flags,
			node->cls ? node->cls->dump_tag : 0,
			node->ctx ? node->ctx->dump_tag : 0, node->ctx_type,
			node->code ? node->code->dump_tag : 0, node->code_ip,
			node->subs_next_idx);
		for (s=node->subs_begin; s; s = s->next) {
			fprintf(dump_file, "%s%d", s == node->subs_begin ? "" : ",",
				s->node ? s->node->dump_tag : 0);
			if ( s->module ) {
				fprintf(dump_file, ":");
				print_string(s->module);
			}
			if ( s->key )
				print_string(s->key);
		}
		fprintf(dump_file, " VALUE=");
		if ( node->value )
			print_string(spl_get_string(node));
		fprintf(dump_file, " HOSTED=");
		if ( node->hnode_name )
			print_string(node->hnode_name);
		fprintf(dump_file, " HDATA=");
		if ( node->hnode_dump )
			print_string(node->hnode_dump);
		fprintf(dump_file, "\n");
	}
}

static void dump_task(struct spl_task *task)
{
	if ( dump_pass ) {
		if (task->dump_tag != 1) return;
		task->dump_tag = dump_counter++;
	} else {
		if (task->dump_tag == 1) return;
		task->dump_tag = 1;
		dump_roof++;
	}

	dump_node(task->ctx);
	dump_code(task->code);

	struct spl_node_stack *s = task->stack;
	while (s) {
		dump_node(s->node);
		s = s->next;
	}

	if ( dump_pass ) {
		fprintf(dump_file, "TASK=%d CTX=%d CODE=%d CODE_IP=%d FLAGS=%d ID=", task->dump_tag,
			task->ctx ? task->ctx->dump_tag : 0,
			task->code ? task->code->dump_tag : 0,
			task->code_ip, task->flags);
		if ( task->id )
			print_string(task->id);
		fprintf(dump_file, " STACK=");
		for (s=task->stack; s; s = s->next)
			fprintf(dump_file, "%s%d", s == task->stack ? "" : ",",
				s->node ? s->node->dump_tag : 0);
		fprintf(dump_file, "\n");
	}
}

static void dump_vm(struct spl_vm *vm)
{
	if ( dump_pass ) {
		fprintf(dump_file, "IDS=0 VALUE=%d VALUE=", dump_roof);
		print_string(SPL_SIGNATURE);
		fprintf(dump_file, "\n");
	}

	dump_node(vm->root);

	struct spl_task *t = vm->task_list;
	while (t) {
		dump_task(t);
		t = t->next;
	}

	if ( dump_pass ) {
		fprintf(dump_file, "VM=1 ROOT=%d\n", vm->root->dump_tag);
		struct spl_module *m = vm->module_list;
		while (m) {
			fprintf(dump_file, "MOD=1 NAME=");
			print_string(m->name);
			fprintf(dump_file, "\n");
			m = m->next;
		}
		fprintf(dump_file, "END=1\n");
	}
}

int spl_dump_ascii(struct spl_vm *vm, FILE *file)
{
	if (vm->undumpable)
		fprintf(file, "VM State is undumpable: %s\n",
				vm->undumpable_info ? vm->undumpable_info :
				"NO UNUMPABLE INFO SET");

#ifdef ENABLE_PTHREAD_SUPPORT
	pthread_mutex_lock(&dump_lck);
#endif

	dump_file = file;
	dump_vm_ptr = vm;
	dump_roof = dump_counter = 2;
	dump_pass = 0; dump_vm(vm);
	dump_pass = 1; dump_vm(vm);

#ifdef ENABLE_PTHREAD_SUPPORT
	pthread_mutex_unlock(&dump_lck);
#endif
	return vm->undumpable ? 1 : 0;
}