/**************************************************************************** * * * GNAT COMPILER COMPONENTS * * * * T A R G T Y P S * * * * Body * * * * Copyright (C) 1992-2012, Free Software Foundation, Inc. * * * * GNAT is free software; you can redistribute it and/or modify it under * * terms of the GNU General Public License as published by the Free Soft- * * ware Foundation; either version 3, or (at your option) any later ver- * * sion. GNAT is distributed in the hope that it will be useful, but WITH- * * OUT 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 distributed with GNAT; see file COPYING3. If not see * * . * * * * GNAT was originally developed by the GNAT team at New York University. * * Extensive contributions were provided by Ada Core Technologies Inc. * * * ****************************************************************************/ /* Functions for retrieving target types. See Ada package Get_Targ */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tree.h" #include "tm.h" #include "tm_p.h" #include "ada.h" #include "types.h" #include "atree.h" #include "elists.h" #include "namet.h" #include "nlists.h" #include "snames.h" #include "stringt.h" #include "uintp.h" #include "urealp.h" #include "fe.h" #include "sinfo.h" #include "einfo.h" #include "ada-tree.h" #include "gigi.h" /* If we don't have a specific size for Ada's equivalent of `long', use that of C. */ #ifndef ADA_LONG_TYPE_SIZE #define ADA_LONG_TYPE_SIZE LONG_TYPE_SIZE #endif /* If we don't have a target definition of WIDEST_HARDWARE_FP_SIZE, assume DOUBLE_TYPE_SIZE. We used to default to LONG_DOUBLE_TYPE_SIZE, which now most often maps 128 bits implemented with very inefficient software emulations so is incorrect as a hardware size estimate. */ #ifndef WIDEST_HARDWARE_FP_SIZE #define WIDEST_HARDWARE_FP_SIZE DOUBLE_TYPE_SIZE #endif /* The following provide a functional interface for the front end Ada code to determine the sizes that are used for various C types. */ Pos get_target_bits_per_unit (void) { return BITS_PER_UNIT; } Pos get_target_bits_per_word (void) { return BITS_PER_WORD; } Pos get_target_char_size (void) { return CHAR_TYPE_SIZE; } Pos get_target_wchar_t_size (void) { /* We never want wide characters less than "short" in Ada. */ return MAX (SHORT_TYPE_SIZE, WCHAR_TYPE_SIZE); } Pos get_target_short_size (void) { return SHORT_TYPE_SIZE; } Pos get_target_int_size (void) { return INT_TYPE_SIZE; } Pos get_target_long_size (void) { return ADA_LONG_TYPE_SIZE; } Pos get_target_long_long_size (void) { return LONG_LONG_TYPE_SIZE; } Pos get_target_float_size (void) { return fp_prec_to_size (FLOAT_TYPE_SIZE); } Pos get_target_double_size (void) { return fp_prec_to_size (DOUBLE_TYPE_SIZE); } Pos get_target_long_double_size (void) { return fp_prec_to_size (WIDEST_HARDWARE_FP_SIZE); } Pos get_target_pointer_size (void) { return POINTER_SIZE; } /* Alignment related values, mapped to attributes for functional and documentation purposes. */ /* Standard'Maximum_Default_Alignment. Maximum alignment that the compiler might choose by default for a type or object. Stricter alignment requests trigger gigi's aligning_type circuitry for stack objects or objects allocated by the default allocator. */ Pos get_target_maximum_default_alignment (void) { return BIGGEST_ALIGNMENT / BITS_PER_UNIT; } /* Standard'System_Allocator_Alignment. Alignment guaranteed to be honored by the default allocator (System.Memory.Alloc or malloc if we have no run-time library at hand). Stricter alignment requests trigger gigi's aligning_type circuitry for objects allocated by the default allocator. */ /* ??? Need a way to get info about __gnat_malloc from here (whether it is handy and what alignment it honors). In the meantime, resort to malloc considerations only. */ /* Account for MALLOC_OBSERVABLE_ALIGNMENTs here. Use this or the ABI guaranteed alignment if greater. */ #ifdef MALLOC_OBSERVABLE_ALIGNMENT #define MALLOC_ALIGNMENT MALLOC_OBSERVABLE_ALIGNMENT #else #define MALLOC_OBSERVABLE_ALIGNMENT (2 * LONG_TYPE_SIZE) #define MALLOC_ALIGNMENT \ MAX (MALLOC_ABI_ALIGNMENT, MALLOC_OBSERVABLE_ALIGNMENT) #endif Pos get_target_system_allocator_alignment (void) { return MALLOC_ALIGNMENT / BITS_PER_UNIT; } /* Standard'Maximum_Allowed_Alignment. Maximum alignment that we may accept for any type or object. */ #ifndef MAX_OFILE_ALIGNMENT #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT #endif Pos get_target_maximum_allowed_alignment (void) { return MAX_OFILE_ALIGNMENT / BITS_PER_UNIT; } /* Standard'Maximum_Alignment. The single attribute initially made available, now a synonym of Standard'Maximum_Default_Alignment. */ Pos get_target_maximum_alignment (void) { return get_target_maximum_default_alignment (); } #ifndef FLOAT_WORDS_BIG_ENDIAN #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN #endif Nat get_float_words_be (void) { return FLOAT_WORDS_BIG_ENDIAN; } Nat get_words_be (void) { return WORDS_BIG_ENDIAN; } Nat get_bytes_be (void) { return BYTES_BIG_ENDIAN; } Nat get_bits_be (void) { return BITS_BIG_ENDIAN; } Nat get_target_strict_alignment (void) { return STRICT_ALIGNMENT; } Nat get_target_double_float_alignment (void) { #ifdef TARGET_ALIGN_NATURAL /* This macro is only defined by the rs6000 port. */ if (!TARGET_ALIGN_NATURAL && (DEFAULT_ABI == ABI_AIX || DEFAULT_ABI == ABI_DARWIN)) return 32 / BITS_PER_UNIT; #endif return 0; } Nat get_target_double_scalar_alignment (void) { #ifdef TARGET_ALIGN_DOUBLE /* This macro is only defined by the i386 and sh ports. */ if (!TARGET_ALIGN_DOUBLE #ifdef TARGET_64BIT && !TARGET_64BIT #endif ) return 32 / BITS_PER_UNIT; #endif return 0; }