/*
 * Copyright (C) 1995-2009 University of Karlsruhe.  All right reserved.
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

/**
 * @file
 * @brief   Write textual representation of firm to file.
 * @author  Moritz Kroll
 * @version $Id$
 */
#include "config.h"

#include <string.h>

#include "irio.h"

#include "irprog.h"
#include "irgraph_t.h"
#include "ircons.h"
#include "irgmod.h"
#include "irflag_t.h"
#include "irgwalk.h"
#include "tv.h"
#include "array.h"
#include "error.h"
#include "adt/set.h"

#define LEXERROR ((unsigned) ~0)

typedef struct io_env
{
	FILE *file;
	set *idset;               /**< id_entry set, which maps from file ids to new Firm elements */
	int ignoreblocks;
	int line, col;
	ir_type **fixedtypes;
} io_env_t;

typedef enum typetag_t
{
	tt_iro,
	tt_tpo,
	tt_align,
	tt_allocation,
	tt_peculiarity,
	tt_pin_state,
	tt_type_state,
	tt_variability,
	tt_visibility,
	tt_volatility
} typetag_t;

typedef struct lex_entry
{
	const char *str;
	typetag_t   typetag;
	unsigned    code;
} lex_entry;

typedef struct id_entry
{
	long id;
	void *elem;
} id_entry;

/** A set of lex_entry elements. */
static set *lexset;


static unsigned hash(const char *str, int len)
{
	return str[0] * 27893 ^ str[len-1] * 81 ^ str[len >> 1];
}

static int lex_cmp(const void *elt, const void *key, size_t size)
{
	const lex_entry *entry = (const lex_entry *) elt;
	const lex_entry *keyentry = (const lex_entry *) key;
	(void) size;
	return strcmp(entry->str, keyentry->str);
}

static int id_cmp(const void *elt, const void *key, size_t size)
{
	const id_entry *entry = (const id_entry *) elt;
	const id_entry *keyentry = (const id_entry *) key;
	(void) size;
	return entry->id - keyentry->id;
}

/** Initializes the lexer. May be called more than once without problems. */
static void init_lexer(void)
{
	lex_entry key;

	/* Only initialize once */
	if(lexset != NULL) return;

	lexset = new_set(lex_cmp, 32);

#define INSERT(s, tt, cod)                                       \
	key.str = (s);                                               \
	key.typetag = (tt);                                          \
	key.code = (cod);                                            \
	set_insert(lexset, &key, sizeof(key), hash(s, sizeof(s)-1))

#define INSERTENUM(tt, e) INSERT(#e, tt, e)

	INSERT("primitive", tt_tpo, tpo_primitive);
	INSERT("method", tt_tpo, tpo_method);
	INSERT("array", tt_tpo, tpo_array);
	INSERT("struct", tt_tpo, tpo_struct);
	INSERT("Unknown", tt_tpo, tpo_unknown);

#include "gen_irio_lex.inl"

	INSERTENUM(tt_align, align_non_aligned);
	INSERTENUM(tt_align, align_is_aligned);

	INSERTENUM(tt_allocation, allocation_automatic);
	INSERTENUM(tt_allocation, allocation_parameter);
	INSERTENUM(tt_allocation, allocation_dynamic);
	INSERTENUM(tt_allocation, allocation_static);

	INSERTENUM(tt_pin_state, op_pin_state_floats);
	INSERTENUM(tt_pin_state, op_pin_state_pinned);
	INSERTENUM(tt_pin_state, op_pin_state_exc_pinned);
	INSERTENUM(tt_pin_state, op_pin_state_mem_pinned);

	INSERTENUM(tt_type_state, layout_undefined);
	INSERTENUM(tt_type_state, layout_fixed);

	INSERTENUM(tt_variability, variability_uninitialized);
	INSERTENUM(tt_variability, variability_initialized);
	INSERTENUM(tt_variability, variability_part_constant);
	INSERTENUM(tt_variability, variability_constant);

	INSERTENUM(tt_visibility, visibility_local);
	INSERTENUM(tt_visibility, visibility_external_visible);
	INSERTENUM(tt_visibility, visibility_external_allocated);

	INSERTENUM(tt_volatility, volatility_non_volatile);
	INSERTENUM(tt_volatility, volatility_is_volatile);

	INSERTENUM(tt_peculiarity, peculiarity_description);
	INSERTENUM(tt_peculiarity, peculiarity_inherited);
	INSERTENUM(tt_peculiarity, peculiarity_existent);

#undef INSERTENUM
#undef INSERT
}

/** Returns the according enum entry for the given string and tag, or LEXERROR if none was found. */
static unsigned lex(const char *str, typetag_t typetag)
{
	lex_entry key, *entry;

	key.str = str;

	entry = set_find(lexset, &key, sizeof(key), hash(str, strlen(str)));
	if (entry && entry->typetag == typetag) {
		return entry->code;
	}
	return LEXERROR;
}

static void *get_id(io_env_t *env, long id)
{
	id_entry key, *entry;
	key.id = id;

	entry = set_find(env->idset, &key, sizeof(key), (unsigned) id);
	return entry ? entry->elem : NULL;
}

static void set_id(io_env_t *env, long id, void *elem)
{
	id_entry key;
	key.id = id;
	key.elem = elem;
	set_insert(env->idset, &key, sizeof(key), (unsigned) id);
}

static void write_mode(io_env_t *env, ir_mode *mode)
{
	fputs(get_mode_name(mode), env->file);
	fputc(' ', env->file);
}

static void write_pinned(io_env_t *env, ir_node *irn)
{
	fputs(get_op_pin_state_name(get_irn_pinned(irn)), env->file);
	fputc(' ', env->file);
}

static void write_volatility(io_env_t *env, ir_node *irn)
{
	ir_volatility vol;

	if(is_Load(irn)) vol = get_Load_volatility(irn);
	else if(is_Store(irn)) vol = get_Store_volatility(irn);
	else assert(0 && "Invalid optype for write_volatility");

	fputs(get_volatility_name(vol), env->file);
	fputc(' ', env->file);
}

static void write_align(io_env_t *env, ir_node *irn)
{
	ir_align align;

	if(is_Load(irn)) align = get_Load_align(irn);
	else if(is_Store(irn)) align = get_Store_align(irn);
	else assert(0 && "Invalid optype for write_align");

	fputs(get_align_name(align), env->file);
	fputc(' ', env->file);
}

static void export_type(io_env_t *env, ir_type *tp)
{
	FILE *f = env->file;
	int i;
	fprintf(f, "\ttype %ld %s \"%s\" %u %u %s %s ",
			get_type_nr(tp),
			get_type_tpop_name(tp),
			get_type_name(tp),
			get_type_size_bytes(tp),
			get_type_alignment_bytes(tp),
			get_type_state_name(get_type_state(tp)),
			get_visibility_name(get_type_visibility(tp)));

	switch(get_type_tpop_code(tp))
	{
		case tpo_array:
		{
			int n = get_array_n_dimensions(tp);
			fprintf(f, "%i %ld ", n, get_type_nr(get_array_element_type(tp)));
			for(i = 0; i < n; i++)
			{
				ir_node *lower = get_array_lower_bound(tp, i);
				ir_node *upper = get_array_upper_bound(tp, i);

				if(is_Const(lower)) fprintf(f, "%ld ", get_tarval_long(get_Const_tarval(lower)));
				else panic("Lower array bound is not constant");

				if(is_Const(upper)) fprintf(f, "%ld ", get_tarval_long(get_Const_tarval(upper)));
				else panic("Upper array bound is not constant");
			}
			break;
		}

		case tpo_method:
		{
			int nparams = get_method_n_params(tp);
			int nresults = get_method_n_ress(tp);
			fprintf(f, "%i %i ", nparams, nresults);
			for(i = 0; i < nparams; i++)
				fprintf(f, "%ld ", get_type_nr(get_method_param_type(tp, i)));
			for(i = 0; i < nresults; i++)
				fprintf(f, "%ld ", get_type_nr(get_method_res_type(tp, i)));
			break;
		}

		case tpo_primitive:
		{
			write_mode(env, get_type_mode(tp));
			break;
		}

		case tpo_struct:
			break;

		case tpo_class:
			// TODO: inheritance stuff not supported yet
			printf("Inheritance of classes not supported yet!\n");
			break;

		case tpo_unknown:
			break;

		default:
			printf("export_type: Unknown type code \"%s\".\n", get_type_tpop_name(tp));
			break;
	}
	fputc('\n', f);
}

static void export_entity(io_env_t *env, ir_entity *ent)
{
	ir_type *owner = get_entity_owner(ent);
	fprintf(env->file, "\tentity %ld \"%s\" %ld %ld %d %d %s %s %s %s %s\n",
			get_entity_nr(ent),
			get_entity_name(ent),
			get_type_nr(get_entity_type(ent)),
			get_type_nr(owner),
			get_entity_offset(ent),
			(int) get_entity_offset_bits_remainder(ent),
			get_allocation_name(get_entity_allocation(ent)),
			get_visibility_name(get_entity_visibility(ent)),
			get_variability_name(get_entity_variability(ent)),
			get_peculiarity_name(get_entity_peculiarity(ent)),
			get_volatility_name(get_entity_volatility(ent)));

	// TODO: inheritance stuff for class entities not supported yet
	if(is_Class_type(owner) && owner != get_glob_type())
		printf("Inheritance of class entities not supported yet!\n");
}

static void export_type_or_ent(type_or_ent tore, void *ctx)
{
	io_env_t *env = (io_env_t *) ctx;

	switch(get_kind(tore.ent))
	{
		case k_entity:
			export_entity(env, tore.ent);
			break;

		case k_type:
			export_type(env, tore.typ);
			break;

		default:
			printf("export_type_or_ent: Unknown type or entity.\n");
			break;
	}
}

static void export_node(ir_node *irn, void *ctx)
{
	io_env_t *env = (io_env_t *) ctx;
	int i, n;
	unsigned opcode = get_irn_opcode(irn);
	char buf[1024];

	if(env->ignoreblocks && opcode == iro_Block) return;

	n = get_irn_arity(irn);

	fprintf(env->file, "\n\t%s %ld [ ", get_irn_opname(irn), get_irn_node_nr(irn));

	for(i = -1; i < n; i++)
	{
		ir_node *pred = get_irn_n(irn, i);
		if(!pred)
			fputs("-1 ", env->file);
		else
			fprintf(env->file, "%ld ", get_irn_node_nr(pred));
	}

	fprintf(env->file, "] { ");

	switch(opcode)
	{
		#include "gen_irio_export.inl"
	}
	fputc('}', env->file);
}

/** Exports the given irg to the given file. */
void ir_export_irg(ir_graph *irg, const char *filename)
{
	io_env_t env;

	env.file = fopen(filename, "wt");
	if(!env.file)
	{
		perror(filename);
		return;
	}

	fputs("typegraph {\n", env.file);

	type_walk_irg(irg, NULL, export_type_or_ent, &env);

	fprintf(env.file, "}\n\nirg %ld {", get_entity_nr(get_irg_entity(irg)));

	env.ignoreblocks = 0;
	irg_block_walk_graph(irg, NULL, export_node, &env);

	env.ignoreblocks = 1;
	irg_walk_anchors(irg, NULL, export_node, &env);

	fputs("\n}\n", env.file);

	fclose(env.file);
}

static int read_c(io_env_t *env)
{
	int ch = fgetc(env->file);
	switch(ch)
	{
		case '\t':
			env->col += 4;
			break;

		case '\n':
			env->col = 0;
			env->line++;
			break;

		default:
			env->col++;
			break;
	}
	return ch;
}

/** Returns the first non-whitespace character or EOF. **/
static int skip_ws(io_env_t *env)
{
	while(1)
	{
		int ch = read_c(env);
		switch(ch)
		{
			case ' ':
			case '\t':
			case '\n':
			case '\r':
				break;

			default:
				return ch;
		}
	}
}

static void skip_to(io_env_t *env, char to_ch)
{
	int ch;
	do
	{
		ch = read_c(env);
	}
	while(ch != to_ch && ch != EOF);
}

static int expect_char(io_env_t *env, char ch)
{
	int curch = skip_ws(env);
	if(curch != ch)
	{
		printf("Unexpected char '%c', expected '%c' in line %i:%i\n", curch, ch, env->line, env->col);
		return 0;
	}
	return 1;
}

#define EXPECT(c) if(expect_char(env, (c))) {} else return 0
#define EXPECT_OR_EXIT(c) if(expect_char(env, (c))) {} else exit(1)

inline static const char *read_str_to(io_env_t *env, char *buf, size_t bufsize)
{
	size_t i;
	for(i = 0; i < bufsize - 1; i++)
	{
		int ch = read_c(env);
		if(ch == EOF) break;
		switch(ch)
		{
			case ' ':
			case '\t':
			case '\n':
			case '\r':
				if(i != 0)
					goto endofword;
				i--;	// skip whitespace
				break;

			default:
				buf[i] = ch;
				break;
		}
	}
endofword:
	buf[i] = 0;
	return buf;
}

static const char *read_str(io_env_t *env)
{
	static char buf[1024];
	return read_str_to(env, buf, sizeof(buf));
}

static const char *read_qstr_to(io_env_t *env, char *buf, size_t bufsize)
{
	size_t i;
	EXPECT_OR_EXIT('\"');
	for(i = 0; i < bufsize - 1; i++)
	{
		int ch = read_c(env);
		if(ch == EOF)
		{
			printf("Unexpected end of quoted string!\n");
			exit(1);
		}
		if(ch == '\"') break;

		buf[i] = ch;
	}
	if(i == bufsize - 1)
	{
		printf("Quoted string too long!\n");
		exit(1);
	}
	buf[i] = 0;
	return buf;
}

static long read_long2(io_env_t *env, char **endptr)
{
	static char buf[1024];
	return strtol(read_str_to(env, buf, sizeof(buf)), endptr, 0);
}

static long read_long(io_env_t *env)
{
	return read_long2(env, NULL);
}

static ir_node *get_node_or_null(io_env_t *env, long nodenr)
{
	ir_node *node = (ir_node *) get_id(env, nodenr);
	if(node && node->kind != k_ir_node)
	{
		panic("Irn ID %ld collides with something else in line %i:%i\n", nodenr, env->line, env->col);
	}
	return node;
}

static ir_node *get_node(io_env_t *env, long nodenr)
{
	ir_node *node = get_node_or_null(env, nodenr);
	if(!node)
		panic("Unknown node: %ld in line %i:%i\n", nodenr, env->line, env->col);

	return node;
}

static ir_node *get_node_or_dummy(io_env_t *env, long nodenr)
{
	ir_node *node = get_node_or_null(env, nodenr);
	if(!node)
	{
		node = new_Dummy(mode_X);
		set_id(env, nodenr, node);
	}
	return node;
}

static ir_type *get_type(io_env_t *env, long typenr)
{
	ir_type *type = (ir_type *) get_id(env, typenr);
	if(!type)
	{
		panic("Unknown type: %ld in line %i:%i\n", typenr, env->line, env->col);
	}
	else if(type->kind != k_type)
	{
		panic("Type ID %ld collides with something else in line %i:%i\n", typenr, env->line, env->col);
	}
	return type;
}

static ir_type *read_type(io_env_t *env)
{
	return get_type(env, read_long(env));
}

static ir_entity *get_entity(io_env_t *env, long entnr)
{
	ir_entity *entity = (ir_entity *) get_id(env, entnr);
	if(!entity)
	{
		printf("Unknown entity: %ld in line %i:%i\n", entnr, env->line, env->col);
		exit(1);
	}
	else if(entity->kind != k_entity)
	{
		panic("Entity ID %ld collides with something else in line %i:%i\n", entnr, env->line, env->col);
	}
	return entity;
}

static ir_entity *read_entity(io_env_t *env)
{
	return get_entity(env, read_long(env));
}

static ir_mode *read_mode(io_env_t *env)
{
	static char buf[128];
	int i, n;

	read_str_to(env, buf, sizeof(buf));

	n = get_irp_n_modes();
	for(i = 0; i < n; i++)
	{
		ir_mode *mode = get_irp_mode(i);
		if(!strcmp(buf, get_mode_name(mode)))
			return mode;
	}

	printf("Unknown mode \"%s\" in line %i:%i\n", buf, env->line, env->col);
	return mode_ANY;
}

static const char *get_typetag_name(typetag_t typetag)
{
	switch(typetag)
	{
		case tt_iro:         return "opcode";
		case tt_tpo:         return "type";
		case tt_align:       return "align";
		case tt_allocation:  return "allocation";
		case tt_peculiarity: return "peculiarity";
		case tt_pin_state:   return "pin state";
		case tt_type_state:  return "type state";
		case tt_variability: return "variability";
		case tt_visibility:  return "visibility";
		case tt_volatility:  return "volatility";
		default: return "<UNKNOWN>";
	}
}

static unsigned read_enum(io_env_t *env, typetag_t typetag)
{
	static char buf[128];
	unsigned code = lex(read_str_to(env, buf, sizeof(buf)), typetag);
	if(code != LEXERROR) return code;

	printf("Invalid %s: \"%s\" in %i:%i\n", get_typetag_name(typetag), buf, env->line, env->col);
	return 0;
}

#define read_align(env)       ((ir_align)       read_enum(env, tt_align))
#define read_allocation(env)  ((ir_allocation)  read_enum(env, tt_allocation))
#define read_peculiarity(env) ((ir_peculiarity) read_enum(env, tt_peculiarity))
#define read_pinned(env)      ((op_pin_state)   read_enum(env, tt_pin_state))
#define read_type_state(env)  ((ir_type_state)  read_enum(env, tt_type_state))
#define read_variability(env) ((ir_variability) read_enum(env, tt_variability))
#define read_visibility(env)  ((ir_visibility)  read_enum(env, tt_visibility))
#define read_volatility(env)  ((ir_volatility)  read_enum(env, tt_volatility))

static tarval *read_tv(io_env_t *env)
{
	static char buf[128];
	ir_mode *tvmode = read_mode(env);
	read_str_to(env, buf, sizeof(buf));
	return new_tarval_from_str(buf, strlen(buf), tvmode);
}

/** Reads a type description and remembers it by its id. */
static void import_type(io_env_t *env)
{
	char           buf[1024];
	int            i;
	ir_type       *type;
	long           typenr = read_long(env);
	const char    *tpop   = read_str(env);
	const char    *name   = read_qstr_to(env, buf, sizeof(buf));
	unsigned       size   = (unsigned) read_long(env);
	unsigned       align  = (unsigned) read_long(env);
	ir_type_state  state  = read_type_state(env);
	ir_visibility  vis    = read_visibility(env);

	ident         *id     = new_id_from_str(name);

	switch(lex(tpop, tt_tpo))
	{
		case tpo_primitive:
		{
			ir_mode *mode = read_mode(env);
			type = new_type_primitive(id, mode);
			break;
		}

		case tpo_method:
		{
			int nparams  = (int) read_long(env);
			int nresults = (int) read_long(env);

			type = new_type_method(id, nparams, nresults);

			for(i = 0; i < nparams; i++)
			{
				long     typenr = read_long(env);
				ir_type *paramtype = get_type(env, typenr);

				set_method_param_type(type, i, paramtype);
			}
			for(i = 0; i < nresults; i++)
			{
				long typenr = read_long(env);
				ir_type *restype = get_type(env, typenr);

				set_method_res_type(type, i, restype);
			}
			break;
		}

		case tpo_array:
		{
			int ndims = (int) read_long(env);
			long elemtypenr = read_long(env);
			ir_type *elemtype = get_type(env, elemtypenr);

			type = new_type_array(id, ndims, elemtype);
			for(i = 0; i < ndims; i++)
			{
				long lowerbound = read_long(env);
				long upperbound = read_long(env);
				set_array_bounds_int(type, i, lowerbound, upperbound);
			}
			set_type_size_bytes(type, size);
			break;
		}

		case tpo_class:
			type = new_type_class(id);
			set_type_size_bytes(type, size);
			break;

		case tpo_struct:
			type = new_type_struct(id);
			set_type_size_bytes(type, size);
			break;

		case tpo_union:
			type = new_type_union(id);
			set_type_size_bytes(type, size);
			break;

		case tpo_unknown:
			return;   // ignore unknown type

		default:
			if(typenr != 0)  // ignore global type
				printf("Unknown type kind: \"%s\" in line %i:%i\n", tpop, env->line, env->col);
			skip_to(env, '\n');
			return;
	}

	set_type_alignment_bytes(type, align);
	set_type_visibility(type, vis);

	if(state == layout_fixed)
		ARR_APP1(ir_type *, env->fixedtypes, type);

	set_id(env, typenr, type);
	printf("Insert type %s %ld\n", name, typenr);
}

/** Reads an entity description and remembers it by its id. */
static void import_entity(io_env_t *env)
{
	char          buf[1024];
	long          entnr       = read_long(env);
	const char   *name        = read_qstr_to(env, buf, sizeof(buf));
	long          typenr      = read_long(env);
	long          ownertypenr = read_long(env);

	ir_type   *type      = get_type(env, typenr);
	ir_type   *ownertype = !ownertypenr ? get_glob_type() : get_type(env, ownertypenr);
	ir_entity *entity    = new_entity(ownertype, new_id_from_str(name), type);

	set_entity_offset     (entity, (int) read_long(env));
	set_entity_offset_bits_remainder(entity, (unsigned char) read_long(env));
	set_entity_allocation (entity, read_allocation(env));
	set_entity_visibility (entity, read_visibility(env));
	set_entity_variability(entity, read_variability(env));
	set_entity_peculiarity(entity, read_peculiarity(env));
	set_entity_volatility (entity, read_volatility(env));

	set_id(env, entnr, entity);
	printf("Insert entity %s %ld\n", name, entnr);
}

/** Parses the whole type graph. */
static int parse_typegraph(io_env_t *env)
{
	const char *kind;
	long curfpos;

	EXPECT('{');

	curfpos = ftell(env->file);

	// parse all types first
	while(1)
	{
		kind = read_str(env);
		if(kind[0] == '}' && !kind[1]) break;

		if(!strcmp(kind, "type"))
			import_type(env);
		else
			skip_to(env, '\n');
	}

	// now parse rest
	fseek(env->file, curfpos, SEEK_SET);
	while(1)
	{
		kind = read_str(env);
		if(kind[0] == '}' && !kind[1]) break;

		if(!strcmp(kind, "type"))
			skip_to(env, '\n');
		else if(!strcmp(kind, "entity"))
			import_entity(env);
		else
		{
			printf("Type graph element not supported yet: \"%s\"\n", kind);
			skip_to(env, '\n');
		}
	}
	return 1;
}

static int read_node_header(io_env_t *env, long *nodenr, long **preds, const char **nodename)
{
	int numpreds;
	*nodename = read_str(env);
	if((*nodename)[0] == '}' && !(*nodename)[1]) return -1;  // end-of-graph

	*nodenr = read_long(env);

	ARR_RESIZE(ir_node *, *preds, 0);

	EXPECT('[');
	for(numpreds = 0; !feof(env->file); numpreds++)
	{
		char *endptr;
		ARR_APP1(long, *preds, read_long2(env, &endptr));
		if(*endptr == ']') break;
	}
	return numpreds;
}

/** Parses an IRG. */
static int parse_graph(io_env_t *env)
{
	long       *preds = NEW_ARR_F(long, 16);
	ir_node   **prednodes = NEW_ARR_F(ir_node *, 16);
	int         i, numpreds, ret = 1;
	long        nodenr;
	const char *nodename;
	ir_node    *node, *newnode;

	current_ir_graph = new_ir_graph(get_entity(env, read_long(env)), 0);

	EXPECT('{');

	while(1)
	{
		numpreds = read_node_header(env, &nodenr, &preds, &nodename);
		if(numpreds == -1) break;  // end-of-graph
		if(!numpreds)
		{
			printf("Node %s %ld is missing predecessors!", nodename, nodenr);
			ret = 0;
			break;
		}

		ARR_RESIZE(ir_node *, prednodes, numpreds);
		for(i = 0; i < numpreds - 1; i++)
			prednodes[i] = get_node_or_dummy(env, preds[i + 1]);

		node = get_node_or_null(env, nodenr);
		newnode = NULL;

		EXPECT('{');

		switch(lex(nodename, tt_iro))
		{
			case iro_End:
			{
				ir_node *newendblock = get_node(env, preds[0]);
				newnode = get_irg_end(current_ir_graph);
				exchange(get_nodes_block(newnode), newendblock);
				break;
			}

			case iro_Start:
			{
				ir_node *newstartblock = get_node(env, preds[0]);
				newnode = get_irg_start(current_ir_graph);
				exchange(get_nodes_block(newnode), newstartblock);
				break;
			}

			case iro_Block:
			{
				if(preds[0] != nodenr)
				{
					printf("Invalid block: preds[0] != nodenr (%ld != %ld)\n",
						preds[0], nodenr);
					ret = 0;
					goto endloop;
				}

				newnode = new_Block(numpreds - 1, prednodes);
				break;
			}

			case iro_Anchor:
				newnode = current_ir_graph->anchor;
				for(i = 0; i < numpreds - 1; i++)
					set_irn_n(newnode, i, prednodes[i]);
				set_irn_n(newnode, -1, get_node(env, preds[0]));
				break;

			case iro_SymConst:
			{
				long entnr = read_long(env);
				union symconst_symbol sym;
				sym.entity_p = get_entity(env, entnr);
				newnode = new_SymConst(mode_P, sym, symconst_addr_ent);
				break;
			}

			#include "gen_irio_import.inl"

			default:
				goto notsupported;
		}

		EXPECT('}');

		if(!newnode)
		{
notsupported:
			printf("Node type not supported yet: %s in line %i:%i\n", nodename, env->line, env->col);
			assert(0 && "Invalid node type");
		}

		if(node)
			exchange(node, newnode);
		/* Always update hash entry to avoid more uses of id nodes */
		set_id(env, nodenr, newnode);
		printf("Insert %s %ld\n", nodename, nodenr);
	}

endloop:
	DEL_ARR_F(preds);
	DEL_ARR_F(prednodes);

	return ret;
}

/** Imports an previously exported textual representation of an (maybe partial) irp */
void ir_import(const char *filename)
{
	int oldoptimize = get_optimize();
	firm_verification_t oldver = get_node_verification_mode();
	io_env_t ioenv;
	io_env_t *env = &ioenv;
	int i, n;

	init_lexer();

	memset(env, 0, sizeof(*env));
	env->idset = new_set(id_cmp, 128);
	env->fixedtypes = NEW_ARR_F(ir_type *, 0);

	env->file = fopen(filename, "rt");
	if(!env->file)
	{
		perror(filename);
		exit(1);
	}

	set_optimize(0);
	do_node_verification(FIRM_VERIFICATION_OFF);

	while(1)
	{
		const char *str = read_str(env);
		if(!*str) break;
		if(!strcmp(str, "typegraph"))
		{
			if(!parse_typegraph(env)) break;
		}
		else if(!strcmp(str, "irg"))
		{
			if(!parse_graph(env)) break;
		}
	}

	n = ARR_LEN(env->fixedtypes);
	for(i = 0; i < n; i++)
		set_type_state(env->fixedtypes[i], layout_fixed);

	DEL_ARR_F(env->fixedtypes);

	del_set(env->idset);

	irp_finalize_cons();

	do_node_verification(oldver);
	set_optimize(oldoptimize);

	fclose(env->file);
}