/*

 * Copyright 2008-2009 Katholieke Universiteit Leuven

 *

 * Use of this software is governed by the MIT license

 *

 * Written by Sven Verdoolaege, K.U.Leuven, Departement

 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium

 */

#include <isl_ctx_private.h>

#include <isl/vec.h>

#include <isl_options_private.h>

#define __isl_calloc(type,size)		((type *)calloc(1, size))

#define __isl_calloc_type(type)		__isl_calloc(type,sizeof(type))

/* Check that the result of an allocation ("p") is not NULL and

 * complain if it is.

 * The only exception is when allocation size ("size") is equal to zero.

 */

static void *check_non_null(isl_ctx *ctx, void *p, size_t size)

{

	if (p || size == 0)

		return p;

	isl_die(ctx, isl_error_alloc, "allocation failure", return NULL);

}

/* Prepare for performing the next "operation" in the context.

 * Return 0 if we are allowed to perform this operation and

 * return -1 if we should abort the computation.

 *

 * In particular, we should stop if the user has explicitly aborted

 * the computation or if the maximal number of operations has been exceeded.

 */

int isl_ctx_next_operation(isl_ctx *ctx)

{

	if (!ctx)

		return -1;

	if (ctx->abort) {

		isl_ctx_set_error(ctx, isl_error_abort);

		return -1;

	}

	if (ctx->max_operations && ctx->operations >= ctx->max_operations)

		isl_die(ctx, isl_error_quota,

			"maximal number of operations exceeded", return -1);

	ctx->operations++;

	return 0;

}

/* Call malloc and complain if it fails.

 * If ctx is NULL, then return NULL.

 */

void *isl_malloc_or_die(isl_ctx *ctx, size_t size)

{

	if (isl_ctx_next_operation(ctx) < 0)

		return NULL;

	return ctx ? check_non_null(ctx, malloc(size), size) : NULL;

}

/* Call calloc and complain if it fails.

 * If ctx is NULL, then return NULL.

 */

void *isl_calloc_or_die(isl_ctx *ctx, size_t nmemb, size_t size)

{

	if (isl_ctx_next_operation(ctx) < 0)

		return NULL;

	return ctx ? check_non_null(ctx, calloc(nmemb, size), nmemb) : NULL;

}

/* Call realloc and complain if it fails.

 * If ctx is NULL, then return NULL.

 */

void *isl_realloc_or_die(isl_ctx *ctx, void *ptr, size_t size)

{

	if (isl_ctx_next_operation(ctx) < 0)

		return NULL;

	return ctx ? check_non_null(ctx, realloc(ptr, size), size) : NULL;

}

void isl_handle_error(isl_ctx *ctx, enum isl_error error, const char *msg,

	const char *file, int line)

{

	if (!ctx)

		return;

	isl_ctx_set_error(ctx, error);

	switch (ctx->opt->on_error) {

	case ISL_ON_ERROR_WARN:

		fprintf(stderr, "%s:%d: %s\n", file, line, msg);

		return;

	case ISL_ON_ERROR_CONTINUE:

		return;

	case ISL_ON_ERROR_ABORT:

		fprintf(stderr, "%s:%d: %s\n", file, line, msg);

		abort();

		return;

	}

}

static struct isl_options *find_nested_options(struct isl_args *args,

	void *opt, struct isl_args *wanted)

{

	int i;

	struct isl_options *options;

	if (args == wanted)

		return opt;

	for (i = 0; args->args[i].type != isl_arg_end; ++i) {

		struct isl_arg *arg = &args->args[i];

		void *child;

		if (arg->type != isl_arg_child)

			continue;

		if (arg->offset == (size_t) -1)

			child = opt;

		else

			child = *(void **)(((char *)opt) + arg->offset);

		options = find_nested_options(arg->u.child.child,

						child, wanted);

		if (options)

			return options;

	}

	return NULL;

}

static struct isl_options *find_nested_isl_options(struct isl_args *args,

	void *opt)

{

	return find_nested_options(args, opt, &isl_options_args);

}

void *isl_ctx_peek_options(isl_ctx *ctx, struct isl_args *args)

{

	if (!ctx)

		return NULL;

	if (args == &isl_options_args)

		return ctx->opt;

	return find_nested_options(ctx->user_args, ctx->user_opt, args);

}

isl_ctx *isl_ctx_alloc_with_options(struct isl_args *args, void *user_opt)

{

	struct isl_ctx *ctx = NULL;

	struct isl_options *opt = NULL;

	int opt_allocated = 0;

	if (!user_opt)

		return NULL;

	opt = find_nested_isl_options(args, user_opt);

	if (!opt) {

		opt = isl_options_new_with_defaults();

		if (!opt)

			goto error;

		opt_allocated = 1;

	}

	ctx = __isl_calloc_type(struct isl_ctx);

	if (!ctx)

		goto error;

	if (isl_hash_table_init(ctx, &ctx->id_table, 0))

		goto error;

	ctx->stats = isl_calloc_type(ctx, struct isl_stats);

	if (!ctx->stats)

		goto error;

	ctx->user_args = args;

	ctx->user_opt = user_opt;

	ctx->opt_allocated = opt_allocated;

	ctx->opt = opt;

	ctx->ref = 0;

	isl_int_init(ctx->zero);

	isl_int_set_si(ctx->zero, 0);

	isl_int_init(ctx->one);

	isl_int_set_si(ctx->one, 1);

	isl_int_init(ctx->two);

	isl_int_set_si(ctx->two, 2);

	isl_int_init(ctx->negone);

	isl_int_set_si(ctx->negone, -1);

	isl_int_init(ctx->normalize_gcd);

	ctx->n_cached = 0;

	ctx->n_miss = 0;

	ctx->error = isl_error_none;

	ctx->operations = 0;

	isl_ctx_set_max_operations(ctx, ctx->opt->max_operations);

	return ctx;

error:

	isl_args_free(args, user_opt);

	if (opt_allocated)

		isl_options_free(opt);

	free(ctx);

	return NULL;

}

struct isl_ctx *isl_ctx_alloc()

{

	struct isl_options *opt;

	opt = isl_options_new_with_defaults();

	return isl_ctx_alloc_with_options(&isl_options_args, opt);

}

void isl_ctx_ref(struct isl_ctx *ctx)

{

	ctx->ref++;

}

void isl_ctx_deref(struct isl_ctx *ctx)

{

	isl_assert(ctx, ctx->ref > 0, return);

	ctx->ref--;

}

/* Print statistics on usage.

 */

static void print_stats(isl_ctx *ctx)

{

	fprintf(stderr, "operations: %lu\n", ctx->operations);

}

void isl_ctx_free(struct isl_ctx *ctx)

{

	if (!ctx)

		return;

	if (ctx->ref != 0)

		isl_die(ctx, isl_error_invalid,

			"isl_ctx freed, but some objects still reference it",

			return);

	if (ctx->opt->print_stats)

		print_stats(ctx);

	isl_hash_table_clear(&ctx->id_table);

	isl_blk_clear_cache(ctx);

	isl_int_clear(ctx->zero);

	isl_int_clear(ctx->one);

	isl_int_clear(ctx->two);

	isl_int_clear(ctx->negone);

	isl_int_clear(ctx->normalize_gcd);

	isl_args_free(ctx->user_args, ctx->user_opt);

	if (ctx->opt_allocated)

		isl_options_free(ctx->opt);

	free(ctx->stats);

	free(ctx);

}

struct isl_options *isl_ctx_options(isl_ctx *ctx)

{

	if (!ctx)

		return NULL;

	return ctx->opt;

}

enum isl_error isl_ctx_last_error(isl_ctx *ctx)

{

	return ctx->error;

}

void isl_ctx_reset_error(isl_ctx *ctx)

{

	ctx->error = isl_error_none;

}

void isl_ctx_set_error(isl_ctx *ctx, enum isl_error error)

{

	if (ctx)

		ctx->error = error;

}

void isl_ctx_abort(isl_ctx *ctx)

{

	if (ctx)

		ctx->abort = 1;

}

void isl_ctx_resume(isl_ctx *ctx)

{

	if (ctx)

		ctx->abort = 0;

}

int isl_ctx_aborted(isl_ctx *ctx)

{

	return ctx ? ctx->abort : -1;

}

int isl_ctx_parse_options(isl_ctx *ctx, int argc, char **argv, unsigned flags)

{

	if (!ctx)

		return -1;

	return isl_args_parse(ctx->user_args, argc, argv, ctx->user_opt, flags);

}

/* Set the maximal number of iterations of "ctx" to "max_operations".

 */

void isl_ctx_set_max_operations(isl_ctx *ctx, unsigned long max_operations)

{

	if (!ctx)

		return;

	ctx->max_operations = max_operations;

}

/* Return the maximal number of iterations of "ctx".

 */

unsigned long isl_ctx_get_max_operations(isl_ctx *ctx)

{

	return ctx ? ctx->max_operations : 0;

}

/* Reset the number of operations performed by "ctx".

 */

void isl_ctx_reset_operations(isl_ctx *ctx)

{

	if (!ctx)

		return;

	ctx->operations = 0;

}