/* * Copyright (C) 1995-2008 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 Representation of and static computations on target machine * values. * @date 2003 * @author Mathias Heil * @version $Id$ * @brief * Tarvals represent target machine values. They are typed by modes. * Tarvals only represent values of mode_sort: * - int_number, * - float_number, * - boolean, * - reference, * - character * * In case of references the module accepts an entity to represent the * value. * Furthermore, computations and conversions of these values can * be performed. * * HISTORY * The original tv module originated in the fiasco compiler written ... * This is the new version, described in the tech report 1999-14 by ... * * @sa * Techreport 1999-14 * irmode.h for the modes definitions * irnode.h for the pn_Cmp table */ #ifndef FIRM_TV_TV_H #define FIRM_TV_TV_H #include "firm_types.h" #include "irnode.h" #include "begin.h" /* ************************ Constructors for tarvals ************************ */ /** * Constructor function for new tarvals. * * @param str The string representing the target value * @param len The length of the string * @param mode The mode requested for the result tarval * * This function creates a new tarval representing the value represented * by a CString, aka char array. If a tarval representing this value already * exists, this tarval is returned instead of a new one. So tarvals are * directly comparable since their representation is unique. * * This function accepts the following strings: * * if mode is int_number: * - 0(x|X)[0-9a-fA-F]+ (hexadecimal representation) * - 0[0-7]* (octal representation) * - (+|-)?[1-9][0-9]* (decimal representation) * * if mode is float_number: * - (+|-)?(decimal int) (. (decimal int))? ((e|E)(+|-)?(decimal int))? * * if mode is boolean: true, True, TRUE ... False... 0, 1, * * if mode is reference: hexadecimal of decimal number as int * * if mode is character: hex or dec * * Leading and/or trailing spaces are ignored * * @return * A tarval of proper type representing the requested value is returned. * Tarvals are unique, so for any value/mode pair at most one tarval will * exist, which will be returned upon further requests with an identical * value/mode pair. * * @note * If the string is not representable in the given mode an assertion is * thrown in assert build. * * @sa * irmode.h for predefined modes * new_tarval_from_long() * new_tarval_from_double() */ FIRM_API ir_tarval *new_tarval_from_str(const char *str, size_t len, ir_mode *mode); /** * Construct a new tarval from a given string. * * @param str The string representing the target value * @param len The length of the string * @param sign is -1 or 1 depending on the numbers sign * @param base number system base. * binary(2), octal(8), decimal(10) and hexadecimal(16) numbers * are supported. * @param mode The mode requested for the result tarval * * @return * A tarval with the given mode. If overflow settings are set to * TV_OVERFLOW_BAD then a tarval_bad is returned if the number can't be * represented in the given mode. * Return bad if the number couldn't successfully be parsed. */ FIRM_API ir_tarval *new_integer_tarval_from_str(const char *str, size_t len, char sign, unsigned char base, ir_mode *mode); /** * Constructor function for new tarvals * * @param l The long representing the value * @param mode The mode requested for the result tarval * * This function creates a new tarval representing the value represented * by a long integer. If a tarval representing this value already exists, * this tarval is returned instead of a new one. So tarvals are directly * comparable since their representation is unique. * * @return * A tarval of proper type representing the requested value is returned. * Tarvals are unique, so for any value/mode pair at most one tarval will * exist, which will be returned upon further requests with an identical * value/mode pair. * * @note * If the long is not representable in the given mode an assertion is * thrown in assert build. * * @sa * irmode.h for predefined modes * new_tarval_from_str() * new_tarval_from_double() * */ FIRM_API ir_tarval *new_tarval_from_long(long l, ir_mode *mode); /** Return value as long if possible. * * This returns a long int with the value represented value, or * gibberish, depending on the size of long int and the size of the * stored value. It works for e.g. 1 as mode_Ls, but might not work for * get_mode_max(mode_Ls). * This will overflow silently, so use only if you know what * you are doing! (better check with tarval_is_long()...) * Works only for int modes, even not for character modes! */ FIRM_API long get_tarval_long(ir_tarval *tv); /** * This validates if get_tarval_long() will return a satisfying * result. I.e. if tv is an int_number and between min, max * of long int (signed!) * * @param tv the tarval */ FIRM_API int tarval_is_long(ir_tarval *tv); /** * Constructor function for new tarvals. * * @param d The (long) double representing the value * @param mode The mode requested for the result tarval * * This function creates a new tarval representing the value represented * by a (long) double. If a tarval representing this value already exists, * this tarval is returned instead of a new one. So tarvals are directly * comparable since their representation is unique. * Only modes of sort float_number can be constructed this way. * * @return * A tarval of proper type representing the requested value is returned. * Tarvals are unique, so for any value/mode pair at most one tarval will * exist, which will be returned upon further requests with an identical * value/mode pair. * * @note * If the (long) double is not representable in the given mode an assertion * is thrown. This will happen for any mode not of sort float_number. * * @sa * irmode.h for predefined values * new_tarval_from_str() * new_tarval_from_long() */ FIRM_API ir_tarval *new_tarval_from_double(double d, ir_mode *mode); /** * same as new_tarval_from_double(), but with a long double argument */ FIRM_API ir_tarval *new_tarval_from_long_double(long double d, ir_mode *mode); /** * This returns a double with the value represented value, or * gibberish, depending on the size of double and the size of the * stored value. * This will overflow silently, so use only if you know what * you are doing! (better check with tarval_is_long...) * * @param tv the tarval */ FIRM_API double get_tarval_double(ir_tarval *tv); /** * same as get_tarval_double but returns a long double value */ FIRM_API long double get_tarval_long_double(ir_tarval *tv); /** * This validates if tarval_to_double() will return a satisfying * result. I.e. if tv is an float_number and between min, max * of double * * @param tv the tarval */ FIRM_API int tarval_is_double(ir_tarval *tv); /** ********** Access routines for tarval fields ********** **/ /* * NAME * get_tarval_mode * get_tarval_ ... * * SYNOPSIS * ir_mode *get_tarval_mode(tarval *tv) * ... * * DESCRIPTION * These are access function for tarval struct members. It is encouraged * to use them instead of direct access to the struct fields. * * PARAMETERS * tv - The tarval to access fields of * * RESULT * get_tv_mode: The mode of the tarval * * SEE ALSO * the struct tarval */ /** * Returns the mode of the tarval. * * @param tv the tarval */ FIRM_API ir_mode *get_tarval_mode(const ir_tarval *tv); /** * Returns 1 if tv is negative * * @param tv the tarval */ FIRM_API int tarval_is_negative(ir_tarval *tv); /** * Returns 1 if tv is null * * @param tv the tarval */ FIRM_API int tarval_is_null(ir_tarval *tv); /** * Returns 1 if tv is the "one" * * @param tv the tarval */ FIRM_API int tarval_is_one(ir_tarval *tv); /** * Returns 1 if tv is the "minus one" * * @param tv the tarval */ FIRM_API int tarval_is_minus_one(ir_tarval *tv); /** * returns non-zero if all bits in the tarval are set */ FIRM_API int tarval_is_all_one(ir_tarval *tv); /** * Return non-zero if the tarval is a constant (ie. NOT * a reserved tarval like bad, undef, reachable etc.) */ FIRM_API int tarval_is_constant(ir_tarval *tv); /** The 'bad' tarval. */ FIRM_API ir_tarval *tarval_bad; /** Returns the 'bad' tarval. */ FIRM_API ir_tarval *get_tarval_bad(void); /** The 'undefined' tarval. */ FIRM_API ir_tarval *tarval_undefined; /** Returns the 'undefined' tarval. */ FIRM_API ir_tarval *get_tarval_undefined(void); /** The mode_b tarval 'false'. */ FIRM_API ir_tarval *tarval_b_false; /** Returns the mode_b tarval 'false'. */ FIRM_API ir_tarval *get_tarval_b_false(void); /** The mode_b tarval 'true'. */ FIRM_API ir_tarval *tarval_b_true; /** Returns the mode_b tarval 'true'. */ FIRM_API ir_tarval *get_tarval_b_true(void); /** The mode_X tarval 'unreachable'. */ FIRM_API ir_tarval *tarval_unreachable; /** Returns the mode_X tarval 'unreachable'. */ FIRM_API ir_tarval *get_tarval_unreachable(void); /** The mode_X tarval 'reachable'. */ FIRM_API ir_tarval *tarval_reachable; /** Returns the mode_X tarval 'reachable'. */ FIRM_API ir_tarval *get_tarval_reachable(void); /** The 'top' tarval. This is just another name for the 'undefined' tarval. */ #define tarval_top tarval_undefined /** Returns the 'top' tarval. */ #define get_tarval_top() get_tarval_undefined() /** The 'bottom' tarval. This is just another name for the 'bad' tarval. */ #define tarval_bottom tarval_bad /** Returns the 'bottom' tarval. */ #define get_tarval_bottom() get_tarval_bad() /* These functions calculate and return a tarval representing the requested * value. * The functions get_mode_{Max,Min,...} return tarvals retrieved from these * functions, but these are stored on initialization of the irmode module and * therefore the irmode functions should be preferred to the functions below. */ /** Returns the maximum value of a given mode. */ FIRM_API ir_tarval *get_tarval_max(ir_mode *mode); /** Returns the minimum value of a given mode. */ FIRM_API ir_tarval *get_tarval_min(ir_mode *mode); /** Returns the 0 value (additive neutral) of a given mode. For reference modes, the NULL value is returned (old tarval_P_void) */ FIRM_API ir_tarval *get_tarval_null(ir_mode *mode); /** Returns the 1 value (multiplicative neutral) of a given mode. */ FIRM_API ir_tarval *get_tarval_one(ir_mode *mode); /** Returns the -1 value (multiplicative neutral) of a given mode. * Returns tarval bad for unsigned modes */ FIRM_API ir_tarval *get_tarval_minus_one(ir_mode *mode); /** returns the value where all bits are 1 of a given mode. * returns tarval_bad for float modes */ FIRM_API ir_tarval *get_tarval_all_one(ir_mode *mode); /** Return quite nan for float_number modes. */ FIRM_API ir_tarval *get_tarval_nan(ir_mode *mode); /** Return +inf for float_number modes. */ FIRM_API ir_tarval *get_tarval_plus_inf(ir_mode *mode); /** Return -inf for float_number modes. */ FIRM_API ir_tarval *get_tarval_minus_inf(ir_mode *mode); /* ******************** Arithmetic operations on tarvals ******************** */ typedef enum tarval_int_overflow_mode_t { TV_OVERFLOW_BAD, /**< tarval module will return tarval_bad if a overflow occurs */ TV_OVERFLOW_WRAP, /**< tarval module will overflow will be ignored, wrap around occurs */ TV_OVERFLOW_SATURATE /**< tarval module will saturate the overflow */ } tarval_int_overflow_mode_t; /** * Sets the overflow mode for integer operations. * * @param ov_mode one of teh overflow modes */ FIRM_API void tarval_set_integer_overflow_mode(tarval_int_overflow_mode_t ov_mode); /** * Get the overflow mode for integer operations. */ FIRM_API tarval_int_overflow_mode_t tarval_get_integer_overflow_mode(void); /** * Compares two tarvals * * Compare a with b and return a pn_Cmp describing the relation * between a and b. This is either pn_Cmp_Uo, pn_Cmp_Lt, pn_Cmp_Eq, pn_Cmp_Gt, * or pn_Cmp_False if a or b are symbolic pointers which can not be compared at all. * * @param a the first tarval to be compared * @param b the second tarval to be compared * * @return * The pn_Cmp best describing the relation between a and b is returned. * This means the mode with the least bits set is returned, e.g. if the * tarvals are equal the pn_Cmp 'pn_Cmp_Eq' is returned, not 'pn_Cmp_Ge' which * indicates 'greater or equal' * * @sa * irnode.h for the definition of pn_Cmp */ FIRM_API pn_Cmp tarval_cmp(ir_tarval *a, ir_tarval *b); /** * Converts a tarval to another mode. * * Convert tarval 'src' to mode 'mode', this will succeed if and only if mode * 'mode' is wider than the mode of src, as defined in the firm documentation * and as returned by the function mode_is_smaller defined in irmode.h. * * @param src The tarval to convert * @param mode Tho mode to convert to * * @return * If a tarval of mode 'mode' with the result of the conversion of the 'src' * tarvals value already exists, it will be returned, else a new tarval is * constructed and returned * * @note * Illegal convertions will trigger a panic * * @sa * FIRM documentation for conversion rules * mode_is_smaller defined in irmode.h */ FIRM_API ir_tarval *tarval_convert_to(ir_tarval *src, ir_mode *mode); /* * These function implement basic computations representable as opcodes * in FIRM nodes. * * PARAMETERS * tarval_neg: * traval_abs: * a - the tarval to operate on * * all others: * a - the first operand tarval * b - the second operand tarval * * RESULT * If necessary a new tarval is constructed for the resulting value, * or the one already carrying the computation result is retrieved and * returned as result. * * NOTES * The order the arguments are given in is important, imagine postfix * notation. * Illegal operations will trigger an assertion. * The sort member of the struct mode defines which operations are valid */ /** * Bitwise Negation of a tarval. * * @param a the first tarval * * @return ~a or tarval_bad */ FIRM_API ir_tarval *tarval_not(ir_tarval *a); /** * Arithmetic Negation of a tarval. * * @param a the first tarval * * @return -a or tarval_bad */ FIRM_API ir_tarval *tarval_neg(ir_tarval *a); /** * Addition of two tarvals. * * @param a the first tarval * @param b the second tarval * * @return a + b or tarval_bad */ FIRM_API ir_tarval *tarval_add(ir_tarval *a, ir_tarval *b); /** * Subtraction from a tarval. * * @param a the first tarval * @param b the second tarval * @param dst_mode the mode of the result, needed for mode_P - mode_P, else NULL * * @return a - b or tarval_bad */ FIRM_API ir_tarval *tarval_sub(ir_tarval *a, ir_tarval *b, ir_mode *dst_mode); /** * Multiplication of tarvals. * * @param a the first tarval * @param b the second tarval * * @return a * b or tarval_bad */ FIRM_API ir_tarval *tarval_mul(ir_tarval *a, ir_tarval *b); /** * Integer division of two tarvals. * * @param a the first tarval * @param b the second tarval * * @return a / b or tarval_bad */ FIRM_API ir_tarval *tarval_div(ir_tarval *a, ir_tarval *b); /** * Remainder of integer division. * * @param a the first tarval * @param b the second tarval * * @return a % b or tarval_bad */ FIRM_API ir_tarval *tarval_mod(ir_tarval *a, ir_tarval *b); /** * Integer division AND remainder. * * @param a the first tarval * @param b the second tarval * @param mod_res after return, contains the remainder result, a % b or tarval_bad * * @return a / b or tarval_bad */ FIRM_API ir_tarval *tarval_divmod(ir_tarval *a, ir_tarval *b, ir_tarval **mod_res); /** * Absolute value of a tarval. * * @param a the first tarval * * @return |a| or tarval_bad */ FIRM_API ir_tarval *tarval_abs(ir_tarval *a); /** * Bitwise and of two integer tarvals. * * @param a the first tarval * @param b the second tarval * * @return a & b or tarval_bad */ FIRM_API ir_tarval *tarval_and(ir_tarval *a, ir_tarval *b); /** * Bitwise and not of two integer tarvals. * * @param a the first tarval * @param b the second tarval * * @return a & ~b or tarval_bad */ FIRM_API ir_tarval *tarval_andnot(ir_tarval *a, ir_tarval *b); /** * Bitwise or of two integer tarvals. * * @param a the first tarval * @param b the second tarval * * @return a | b or tarval_bad */ FIRM_API ir_tarval *tarval_or(ir_tarval *a, ir_tarval *b); /** * Bitwise exclusive or of two integer tarvals. * * @param a the first tarval * @param b the second tarval * * @return a ^ b or tarval_bad */ FIRM_API ir_tarval *tarval_eor(ir_tarval *a, ir_tarval *b); /** * Logical Left shift. * * @param a the first tarval * @param b the second tarval * * @return a << b or tarval_bad */ FIRM_API ir_tarval *tarval_shl(ir_tarval *a, ir_tarval *b); /** * Unsigned (logical) right shift. * * @param a the first tarval * @param b the second tarval * * @return a >>u b or tarval_bad */ FIRM_API ir_tarval *tarval_shr(ir_tarval *a, ir_tarval *b); /** * Signed (arithmetic) right shift. * * @param a the first tarval * @param b the second tarval * * @return a >>s b or tarval_bad */ FIRM_API ir_tarval *tarval_shrs(ir_tarval *a, ir_tarval *b); /** * Rotation to left. * * @param a the first tarval * @param b the second tarval * * @return a \<\\> b or tarval_bad */ FIRM_API ir_tarval *tarval_rotl(ir_tarval *a, ir_tarval *b); /** * Returns the carry flag of the last operation. */ FIRM_API int tarval_carry(void); /* *********** Output of tarvals *********** */ /** * The output mode for tarval values. * * Some modes allow more that one representation, for instance integers * can be represented hex or decimal. Of course it would be enough to have * one and let every backend convert it into the 'right' one. * However, we can do this in the tarval much simpler... */ typedef enum { TVO_NATIVE, /**< the default output mode, depends on the mode */ TVO_HEX, /**< use hex representation, always possible */ TVO_DECIMAL, /**< use decimal representation */ TVO_OCTAL, /**< use octal representation */ TVO_BINARY, /**< use binary representation */ TVO_FLOAT, /**< use floating point representation (i.e 1.342e-2)*/ TVO_HEXFLOAT /**< use hexadecimal floating point representation (i.e 0x1.ea32p-12)*/ } tv_output_mode; /** * This structure contains helper information to format the output * of a tarval of a mode. */ typedef struct tarval_mode_info { tv_output_mode mode_output; /**< if != TVO_NATIVE select a special mode */ const char *mode_prefix; /**< if set, this prefix will be printed before a value of this mode */ const char *mode_suffix; /**< if set, this suffix will be printed after a value of this mode */ } tarval_mode_info; /** * Specify the output options of one mode. * * This functions stores the mode info, so DO NOT DESTROY it. * * @param mode a ir_mode that should be associated * @param modeinfo the output format info * * @return zero on success. */ FIRM_API int set_tarval_mode_output_option(ir_mode *mode, const tarval_mode_info *modeinfo); /** * Returns the output options of one mode. * * This functions returns the mode info of a given mode. * * @param mode a ir_mode that should be associated * * @return the output option */ FIRM_API const tarval_mode_info *get_tarval_mode_output_option(ir_mode *mode); /** * Returns Bit representation of a tarval value, as string of '0' and '1' * * @param tv The tarval * * This function returns a printable bit representation of any value * stored as tarval. This representation is a null terminated C string. * * @return * As usual in C a pointer to a char is returned. The length of the * returned string if fixed, just read as many chars as the mode defines * as size. * * @note * The string is allocated using malloc() and is free()ed on the next call * of this function. * The string consists of the ASCII characters '0' and '1' and is * null terminated * * @sa * irmode.h for the definition of the ir_mode struct * the size member of aforementioned struct */ FIRM_API char *get_tarval_bitpattern(ir_tarval *tv); /** * Returns the bitpattern of the bytes_ofs byte. * * This function succeeds even if the mode of the tarval uses lesser bits * than requested, in that case the bitpattern is filled with zero bits. * * To query a 32bit value the following code can be used: * * val0 = tarval_sub_bits(tv, 0); <- lowest bits * val1 = tarval_sub_bits(tv, 1); * val2 = tarval_sub_bits(tv, 2); * val3 = tarval_sub_bits(tv, 3); <- highest bits * * Because this is the bit representation of the target machine, only the following * operations are legal on the result: * * - concatenation (endian dependence MUST be handled by the CALLER) * - bitwise logical operations to select/mask bits * * @param tv the tarval * @param byte_ofs the byte offset from lower to higher * * @note * The result of this function is undefined if the mode is neither integer nor float. */ FIRM_API unsigned char get_tarval_sub_bits(ir_tarval *tv, unsigned byte_ofs); /** * Returns non-zero if a given (integer) tarval has only one single bit * set. * * @param tv the tarval */ FIRM_API int tarval_is_single_bit(ir_tarval *tv); /** * Return the number of set bits in a given (integer) tarval. * * @param tv the tarval * * @return number of set bits or -1 on error */ FIRM_API int get_tarval_popcount(ir_tarval *tv); /** * Return the number of the lowest set bit in a given (integer) tarval. * * @param tv the tarval * * @return number of lowest set bit or -1 on error */ FIRM_API int get_tarval_lowest_bit(ir_tarval *tv); /** * Output a tarval to a string buffer. * * @param buf the output buffer * @param buflen the length of the buffer * @param tv the tarval */ FIRM_API int tarval_snprintf(char *buf, size_t buflen, ir_tarval *tv); /** * Output a tarval to stdio. * * @param tv the tarval */ FIRM_API int tarval_printf(ir_tarval *tv); /** * Returns non-zero if the mantissa of a floating point IEEE-754 * tarval is zero (i.e. 1.0Exxx) * * @param tv the tarval */ FIRM_API int tarval_ieee754_zero_mantissa(ir_tarval *tv); /** * Returns the exponent of a floating point IEEE-754 * tarval. * * @param tv the tarval */ FIRM_API int tarval_ieee754_get_exponent(ir_tarval *tv); /** * Check if the tarval can be converted to the given mode without * precision loss. * * @param tv the tarval * @param mode the mode to convert to */ FIRM_API int tarval_ieee754_can_conv_lossless(ir_tarval *tv, ir_mode *mode); /** * Set the immediate precision for IEEE-754 results. Set this to * 0 to get the same precision as the operands. * For x87 compatibility, set this to 80. * * @return the old setting */ FIRM_API unsigned tarval_ieee754_set_immediate_precision(unsigned bits); /** * Returns non-zero if the result of the last IEEE-754 operation was exact. */ FIRM_API unsigned tarval_ieee754_get_exact(void); /** * Return the size of the mantissa in bits (including possible * implicit bits) for the given mode. */ FIRM_API unsigned tarval_ieee754_get_mantissa_size(const ir_mode *mode); /** * Enable/Disable floating point constant folding. */ FIRM_API void tarval_enable_fp_ops(int enable); /** returns 0/1 if floating point folding is enable/disabled */ FIRM_API int tarval_fp_ops_enabled(void); /** * Check if its the a floating point NaN. * * @param tv the tarval */ FIRM_API int tarval_is_NaN(ir_tarval *tv); /** * Check if its the a floating point +inf. * * @param tv the tarval */ FIRM_API int tarval_is_plus_inf(ir_tarval *tv); /** * Check if its the a floating point -inf. * * @param tv the tarval */ FIRM_API int tarval_is_minus_inf(ir_tarval *tv); /** * Check if the tarval represents a finite value, ie neither NaN nor inf. * * @param tv the tarval */ FIRM_API int tarval_is_finite(ir_tarval *tv); /** * Checks whether a pointer points to a tarval. * * @param thing an arbitrary pointer * * @return * true if the thing is a tarval, else false */ FIRM_API int is_tarval(const void *thing); #include "end.h" #endif