irmode.c 14.6 KB
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/*
 * This file is part of libFirm.
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 * Copyright (C) 2012 University of Karlsruhe.
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 */

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/**
 * @file
 * @brief    Data modes of operations.
 * @author   Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Mathias Heil
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 */
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#include <stdlib.h>
#include <stddef.h>
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#include <stdbool.h>
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#include "irprog_t.h"
#include "irmode_t.h"
#include "ident.h"
#include "tv_t.h"
#include "obst.h"
#include "irhooks.h"
#include "array.h"
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#include "panic.h"
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#include "pattern_dmp.h"
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#include "strcalc.h"
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/** Obstack to hold all modes. */
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static struct obstack modes;
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/** The list of all currently existing modes. */
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static ir_mode **mode_list;

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static bool modes_are_equal(const ir_mode *m, const ir_mode *n)
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{
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	if (m->sort != n->sort)
		return false;
	if (m->sort == irms_auxiliary || m->sort == irms_data)
		return strcmp(m->name, n->name) == 0;
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	return m->arithmetic        == n->arithmetic
	    && m->size              == n->size
	    && m->sign              == n->sign
	    && m->modulo_shift      == n->modulo_shift
	    && m->int_conv_overflow == n->int_conv_overflow;
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}
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/**
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 * searches the modes obstack for the given mode and returns
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 * a pointer on an equal mode already in the array, NULL if
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 * none found
 */
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static ir_mode *find_mode(const ir_mode *m)
{
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	for (size_t i = 0, n_modes = ARR_LEN(mode_list); i < n_modes; ++i) {
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		ir_mode *n = mode_list[i];
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		if (modes_are_equal(n, m))
			return n;
	}
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	return NULL;
}

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ir_mode *mode_T;
ir_mode *mode_X;
ir_mode *mode_M;
ir_mode *mode_BB;
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ir_mode *mode_ANY;
ir_mode *mode_BAD;
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ir_mode *mode_F;
ir_mode *mode_D;
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ir_mode *mode_Bs;
ir_mode *mode_Bu;
ir_mode *mode_Hs;
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ir_mode *mode_Hu;
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ir_mode *mode_Is;
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ir_mode *mode_Iu;
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ir_mode *mode_Ls;
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ir_mode *mode_Lu;
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ir_mode *mode_b;
ir_mode *mode_P;
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ir_mode *get_modeT(void)   { return mode_T;   }
ir_mode *get_modeF(void)   { return mode_F;   }
ir_mode *get_modeD(void)   { return mode_D;   }
ir_mode *get_modeBs(void)  { return mode_Bs;  }
ir_mode *get_modeBu(void)  { return mode_Bu;  }
ir_mode *get_modeHs(void)  { return mode_Hs;  }
ir_mode *get_modeHu(void)  { return mode_Hu;  }
ir_mode *get_modeIs(void)  { return mode_Is;  }
ir_mode *get_modeIu(void)  { return mode_Iu;  }
ir_mode *get_modeLs(void)  { return mode_Ls;  }
ir_mode *get_modeLu(void)  { return mode_Lu;  }
ir_mode *get_modeb(void)   { return mode_b;   }
ir_mode *get_modeP(void)   { return mode_P;   }
ir_mode *get_modeX(void)   { return mode_X;   }
ir_mode *get_modeM(void)   { return mode_M;   }
ir_mode *get_modeBB(void)  { return mode_BB;  }
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ir_mode *get_modeANY(void) { return mode_ANY; }
ir_mode *get_modeBAD(void) { return mode_BAD; }
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void set_modeP(ir_mode *p)
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{
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	assert(mode_is_reference(p));
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	mode_P = p;
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}
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/*
 * Creates a new mode.
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 */
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static ir_mode *alloc_mode(const char *name, ir_mode_sort sort,
                           ir_mode_arithmetic arithmetic, unsigned bit_size,
                           int sign, unsigned modulo_shift)
{
	ir_mode *mode_tmpl = OALLOCZ(&modes, ir_mode);

	mode_tmpl->name         = new_id_from_str(name);
	mode_tmpl->sort         = sort;
	mode_tmpl->size         = bit_size;
	mode_tmpl->sign         = sign ? 1 : 0;
	mode_tmpl->modulo_shift = modulo_shift;
	mode_tmpl->arithmetic   = arithmetic;
	return mode_tmpl;
}

static ir_mode *register_mode(ir_mode *mode)
{
	/* does any of the existing modes have the same properties? */
	ir_mode *old = find_mode(mode);
	if (old != NULL) {
		/* remove new mode from obstack */
		obstack_free(&modes, mode);
		return old;
	}
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	mode->kind = k_ir_mode;
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	mode->type = new_type_primitive(mode);
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	ARR_APP1(ir_mode*, mode_list, mode);
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	init_mode_values(mode);
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	hook_new_mode(mode);
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	return mode;
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}

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ir_mode *new_int_mode(const char *name, ir_mode_arithmetic arithmetic,
                      unsigned bit_size, int sign, unsigned modulo_shift)
{
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	if (bit_size >= (unsigned)sc_get_precision())
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		panic("cannot create mode: more bits than tarval module maximum");
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	ir_mode *result = alloc_mode(name, irms_int_number, arithmetic, bit_size,
	                             sign, modulo_shift);
	return register_mode(result);
}
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ir_mode *new_reference_mode(const char *name, ir_mode_arithmetic arithmetic,
                            unsigned bit_size, unsigned modulo_shift)
{
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	if (bit_size >= (unsigned)sc_get_precision())
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		panic("cannot create mode: more bits than tarval module maximum");
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	ir_mode *result = alloc_mode(name, irms_reference, arithmetic, bit_size,
	                             0, modulo_shift);
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	ir_mode *res = register_mode(result);

	/* construct the unsigned_eq mode */
	char buf[64];
	snprintf(buf, sizeof(buf), "%s_iu", name);
	ir_mode *unsigned_eq = alloc_mode(buf, irms_int_number, arithmetic,
	                                  bit_size, 0, modulo_shift);
	unsigned_eq = register_mode(unsigned_eq);
	set_reference_mode_unsigned_eq(res, unsigned_eq);
	return res;
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}
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ir_mode *new_float_mode(const char *name, ir_mode_arithmetic arithmetic,
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                        unsigned exponent_size, unsigned mantissa_size,
                        float_int_conversion_overflow_style_t conv_overflow)
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{
	bool     explicit_one = false;
	unsigned bit_size     = exponent_size + mantissa_size + 1;

	if (arithmetic == irma_x86_extended_float) {
		explicit_one = true;
	} else if (arithmetic != irma_ieee754) {
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		panic("arithmetic %s invalid for float");
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	}
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	if (exponent_size >= 256)
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		panic("exponents >= 256 bits not supported");
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	if (mantissa_size >= 256)
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		panic("mantissa >= 256 bits not supported");
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	if (exponent_size >= (unsigned)sc_get_precision())
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		panic("cannot create mode: more bits than tarval module maximum");
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	if (mantissa_size >= (unsigned)sc_get_precision())
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		panic("cannot create mode: more bits than tarval module maximum");
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	ir_mode *result
		= alloc_mode(name, irms_float_number, arithmetic, bit_size, 1, 0);
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	result->int_conv_overflow        = conv_overflow;
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	result->float_desc.exponent_size = exponent_size;
	result->float_desc.mantissa_size = mantissa_size;
	result->float_desc.explicit_one  = explicit_one;
	return register_mode(result);
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}

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ir_mode *new_non_arithmetic_mode(const char *name)
{
	ir_mode *result = alloc_mode(name, irms_data, irma_none, 0, 0, 0);
	return register_mode(result);
}

static ir_mode *new_non_data_mode(const char *name)
{
	ir_mode *result = alloc_mode(name, irms_auxiliary, irma_none, 0, 0, 0);
	return register_mode(result);
}

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ident *(get_mode_ident)(const ir_mode *mode)
{
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	return get_mode_ident_(mode);
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}

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const char *get_mode_name(const ir_mode *mode)
{
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	return get_id_str(mode->name);
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}

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unsigned (get_mode_size_bits)(const ir_mode *mode)
{
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	return get_mode_size_bits_(mode);
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}

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unsigned (get_mode_size_bytes)(const ir_mode *mode)
{
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	return get_mode_size_bytes_(mode);
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}

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int (get_mode_sign)(const ir_mode *mode)
{
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	return get_mode_sign_(mode);
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}

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ir_mode_arithmetic (get_mode_arithmetic)(const ir_mode *mode)
{
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	return get_mode_arithmetic_(mode);
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}

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unsigned int (get_mode_modulo_shift)(const ir_mode *mode)
{
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	return get_mode_modulo_shift_(mode);
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}

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ir_tarval *get_mode_min(const ir_mode *mode)
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{
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	assert(mode_is_data(mode));
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	return mode->min;
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}

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ir_tarval *get_mode_max(const ir_mode *mode)
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{
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	assert(mode_is_data(mode));
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	return mode->max;
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}

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ir_tarval *get_mode_null(const ir_mode *mode)
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{
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	assert(mode_is_data(mode));
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	return mode->null;
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}

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ir_tarval *get_mode_one(const ir_mode *mode)
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{
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	assert(mode_is_data(mode));
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	return mode->one;
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}

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ir_tarval *get_mode_all_one(const ir_mode *mode)
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{
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	assert(mode_is_data(mode));
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	return mode->all_one;
}

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ir_tarval *get_mode_infinite(const ir_mode *mode)
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{
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	assert(mode_is_float(mode));
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	return mode->infinity;
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}

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ir_tarval *get_mode_NAN(const ir_mode *mode)
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{
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	assert(mode_is_float(mode));
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	return mode->nan;
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}

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int (mode_is_signed)(const ir_mode *mode)
{
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	return mode_is_signed_(mode);
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}

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int (mode_is_float)(const ir_mode *mode)
{
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	return mode_is_float_(mode);
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}

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int (mode_is_int)(const ir_mode *mode)
{
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	return mode_is_int_(mode);
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}

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int (mode_is_reference)(const ir_mode *mode)
{
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	return mode_is_reference_(mode);
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}

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int (mode_is_num)(const ir_mode *mode)
{
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	return mode_is_num_(mode);
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}

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int (mode_is_data)(const ir_mode *mode)
{
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	return mode_is_data_(mode);
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}

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unsigned (get_mode_mantissa_size)(const ir_mode *mode)
{
	return get_mode_mantissa_size_(mode);
}

unsigned (get_mode_exponent_size)(const ir_mode *mode)
{
	return get_mode_exponent_size_(mode);
}

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float_int_conversion_overflow_style_t get_mode_float_int_overflow(
		const ir_mode *mode)
{
	return mode->int_conv_overflow;
}

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int smaller_mode(const ir_mode *sm, const ir_mode *lm)
{
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	assert(sm != NULL);
	assert(lm != NULL);
	if (sm == lm) return true;
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	switch (get_mode_sort(sm)) {
	case irms_int_number:
		switch (get_mode_sort(lm)) {
		case irms_int_number:
			if (get_mode_arithmetic(sm) != get_mode_arithmetic(lm))
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				return false;
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			/* only two complement implemented */
			assert(get_mode_arithmetic(sm) == irma_twos_complement);

			/* integers are convertable if
			 *   - both have the same sign and lm is the larger one
			 *   - lm is the signed one and is at least two bits larger
			 *     (one for the sign, one for the highest bit of sm)
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			 *   - sm & lm are two_complement and lm has greater or equal
			 *     number of bits
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			 */
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			unsigned sm_bits = get_mode_size_bits(sm);
			unsigned lm_bits = get_mode_size_bits(lm);
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			if (mode_is_signed(sm)) {
				if (!mode_is_signed(lm))
					return 0;
				return sm_bits <= lm_bits;
			} else {
				if (mode_is_signed(lm)) {
					return sm_bits < lm_bits;
				}
				return sm_bits <= lm_bits;
			}

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		case irms_auxiliary:
		case irms_data:
		case irms_internal_boolean:
		case irms_reference:
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		case irms_float_number:
			/* int to float works if the float is large enough */
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			return false;
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		}
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		panic("invalid mode_sort");
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	case irms_float_number:
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		return get_mode_arithmetic(sm) == get_mode_arithmetic(lm)
		    && get_mode_sort(lm) == irms_float_number
		    && get_mode_size_bits(lm) >= get_mode_size_bits(sm);
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	case irms_auxiliary:
	case irms_data:
	case irms_internal_boolean:
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	case irms_reference:
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		/* do exist machines out there with different pointer lengths ?*/
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		return false;
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	}

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	panic("invalid mode_sort");
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}

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int values_in_mode(const ir_mode *sm, const ir_mode *lm)
{
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	assert(sm != NULL);
	assert(lm != NULL);
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	if (sm == lm)
		return true;
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	if (sm == mode_b)
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		return mode_is_int(lm) || mode_is_float(lm);

	ir_mode_arithmetic larith = get_mode_arithmetic(lm);
	ir_mode_arithmetic sarith = get_mode_arithmetic(sm);
	switch (larith) {
	case irma_x86_extended_float:
	case irma_ieee754:
		if (sarith == irma_ieee754 || sarith == irma_x86_extended_float) {
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			return get_mode_size_bits(sm) <= get_mode_size_bits(lm);
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		} else if (sarith == irma_twos_complement) {
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			unsigned int_mantissa
				= get_mode_size_bits(sm) - (mode_is_signed(sm) ? 1 : 0);
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			unsigned float_mantissa = get_mode_mantissa_size(lm) + 1;
			return int_mantissa <= float_mantissa;
		}
		break;
	case irma_twos_complement:
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		if (sarith == irma_twos_complement)
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			return get_mode_size_bits(sm) <= get_mode_size_bits(lm);
		break;
	case irma_none:
		break;
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	}
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	return false;
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}

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ir_mode *get_reference_mode_unsigned_eq(const ir_mode *mode)
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{
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	assert(mode_is_reference(mode));
	return mode->eq_unsigned;
}

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void set_reference_mode_unsigned_eq(ir_mode *ref_mode, ir_mode *int_mode)
{
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	assert(mode_is_reference(ref_mode));
	assert(mode_is_int(int_mode));
	ref_mode->eq_unsigned = int_mode;
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}

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void init_mode(void)
{
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	obstack_init(&modes);
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	mode_list = NEW_ARR_F(ir_mode*, 0);
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	/* initialize predefined modes */
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	mode_BB  = new_non_data_mode("BB");
	mode_X   = new_non_data_mode("X");
	mode_M   = new_non_data_mode("M");
	mode_T   = new_non_data_mode("T");
	mode_ANY = new_non_data_mode("ANY");
	mode_BAD = new_non_data_mode("BAD");
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	mode_b   = alloc_mode("b", irms_internal_boolean, irma_none, 1, 0, 0);
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	mode_b   = register_mode(mode_b);
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	mode_F   = new_float_mode("F", irma_ieee754,  8, 23, ir_overflow_min_max);
	mode_D   = new_float_mode("D", irma_ieee754, 11, 52, ir_overflow_min_max);
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	mode_Bs  = new_int_mode("Bs",  irma_twos_complement, 8,   1, 32);
	mode_Bu  = new_int_mode("Bu",  irma_twos_complement, 8,   0, 32);
	mode_Hs  = new_int_mode("Hs",  irma_twos_complement, 16,  1, 32);
	mode_Hu  = new_int_mode("Hu",  irma_twos_complement, 16,  0, 32);
	mode_Is  = new_int_mode("Is",  irma_twos_complement, 32,  1, 32);
	mode_Iu  = new_int_mode("Iu",  irma_twos_complement, 32,  0, 32);
	mode_Ls  = new_int_mode("Ls",  irma_twos_complement, 64,  1, 64);
	mode_Lu  = new_int_mode("Lu",  irma_twos_complement, 64,  0, 64);

	mode_P   = new_reference_mode("P", irma_twos_complement, 32, 32);
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}
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ir_mode *find_unsigned_mode(const ir_mode *mode)
{
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	ir_mode n = *mode;
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	/* allowed for reference mode */
	if (mode->sort == irms_reference)
		n.sort = irms_int_number;

	assert(n.sort == irms_int_number);
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	n.sign = 0;
	return find_mode(&n);
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}

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ir_mode *find_signed_mode(const ir_mode *mode)
{
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	ir_mode n = *mode;
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	assert(mode->sort == irms_int_number);
	n.sign = 1;
	return find_mode(&n);
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}

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ir_mode *find_double_bits_int_mode(const ir_mode *mode)
{
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	ir_mode n = *mode;
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	assert(mode->sort == irms_int_number
	       && mode->arithmetic == irma_twos_complement);
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	n.size = 2*mode->size;
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	if (n.modulo_shift != 0 && n.modulo_shift < n.size)
		n.modulo_shift = n.size;
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	return find_mode(&n);
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}
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int mode_has_signed_zero(const ir_mode *mode)
{
	switch (mode->arithmetic) {
	case irma_ieee754:
	case irma_x86_extended_float:
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		return true;
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	case irma_none:
	case irma_twos_complement:
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		return false;
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	}
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	panic("invalid arithmetic mode");
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}

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int mode_overflow_on_unary_Minus(const ir_mode *mode)
{
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	switch (mode->arithmetic) {
	case irma_twos_complement:
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		return true;
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	case irma_ieee754:
	case irma_x86_extended_float:
	case irma_none:
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		return false;
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	}
	panic("invalid arithmetic mode");
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}

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int mode_wrap_around(const ir_mode *mode)
{
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	switch (mode->arithmetic) {
	case irma_twos_complement:
	case irma_none:
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		return true;
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	case irma_ieee754:
	case irma_x86_extended_float:
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		return false;
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	}
	panic("invalid arithmetic mode");
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}

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int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst)
{
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	if (src == dst)
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		return true;
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	if (get_mode_size_bits(src) != get_mode_size_bits(dst))
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		return false;
	ir_mode_arithmetic ma = get_mode_arithmetic(src);
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	if (ma != get_mode_arithmetic(dst))
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		return false;
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	return ma == irma_twos_complement;
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}

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ir_type *(get_type_for_mode) (const ir_mode *mode)
{
	return get_type_for_mode_(mode);
}

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size_t ir_get_n_modes(void)
{
	return ARR_LEN(mode_list);
}

ir_mode *ir_get_mode(size_t num)
{
	assert(num < ARR_LEN(mode_list));
	return mode_list[num];
}

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void finish_mode(void)
{
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	obstack_free(&modes, 0);
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	DEL_ARR_F(mode_list);
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	mode_T   = NULL;
	mode_X   = NULL;
	mode_M   = NULL;
	mode_BB  = NULL;
	mode_ANY = NULL;
	mode_BAD = NULL;

	mode_F   = NULL;
	mode_D   = NULL;

	mode_Bs  = NULL;
	mode_Bu  = NULL;
	mode_Hs  = NULL;
	mode_Hu  = NULL;
	mode_Is  = NULL;
	mode_Iu  = NULL;
	mode_Ls  = NULL;
	mode_Lu  = NULL;

	mode_b   = NULL;

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	mode_P   = NULL;
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}