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Diffstat (limited to 'gcc/gengenrtl.c')
| -rw-r--r-- | gcc/gengenrtl.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/gcc/gengenrtl.c b/gcc/gengenrtl.c new file mode 100644 index 000000000..fc530288b --- /dev/null +++ b/gcc/gengenrtl.c @@ -0,0 +1,293 @@ +/* Generate code to allocate RTL structures. + Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2007, 2010 + Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT 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 +along with GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + + +#include "bconfig.h" +#include "system.h" + +struct rtx_definition +{ + const char *const enumname, *const name, *const format; +}; + +/* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what + CONST_DOUBLE_FORMAT is because we're not going to be generating + anything for CONST_DOUBLE anyway. */ +#define CONST_DOUBLE_FORMAT "" + +#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT }, + +static const struct rtx_definition defs[] = +{ +#include "rtl.def" /* rtl expressions are documented here */ +}; +#define NUM_RTX_CODE ARRAY_SIZE(defs) + +static const char *formats[NUM_RTX_CODE]; + +/* Decode a format letter into a C type string. */ + +static const char * +type_from_format (int c) +{ + switch (c) + { + case 'i': + return "int "; + + case 'w': + return "HOST_WIDE_INT "; + + case 's': + return "const char *"; + + case 'e': case 'u': + return "rtx "; + + case 'E': + return "rtvec "; + case 't': + return "union tree_node *"; /* tree - typedef not available */ + case 'B': + return "struct basic_block_def *"; /* basic block - typedef not available */ + default: + gcc_unreachable (); + } +} + +/* Decode a format letter into the proper accessor function. */ + +static const char * +accessor_from_format (int c) +{ + switch (c) + { + case 'i': + return "XINT"; + + case 'w': + return "XWINT"; + + case 's': + return "XSTR"; + + case 'e': case 'u': + return "XEXP"; + + case 'E': + return "XVEC"; + + case 't': + return "XTREE"; + + case 'B': + return "XBBDEF"; + + default: + gcc_unreachable (); + } +} + +/* Return nonzero if we should ignore FMT, an RTL format, when making + the list of formats we write routines to create. */ + +static int +special_format (const char *fmt) +{ + return (strchr (fmt, '*') != 0 + || strchr (fmt, 'V') != 0 + || strchr (fmt, 'S') != 0 + || strchr (fmt, 'n') != 0); +} + +/* Return nonzero if the RTL code given by index IDX is one that we should + generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO + is a wrapper in emit-rtl.c). */ + +static int +special_rtx (int idx) +{ + return (strcmp (defs[idx].enumname, "CONST_INT") == 0 + || strcmp (defs[idx].enumname, "REG") == 0 + || strcmp (defs[idx].enumname, "SUBREG") == 0 + || strcmp (defs[idx].enumname, "MEM") == 0 + || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0); +} + +/* Return nonzero if the RTL code given by index IDX is one that we should + generate no macro for at all (because gen_rtx_FOO is never used or + cannot have the obvious interface). */ + +static int +excluded_rtx (int idx) +{ + return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0) + || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0)); +} + +/* Place a list of all format specifiers we use into the array FORMAT. */ + +static void +find_formats (void) +{ + unsigned int i; + + for (i = 0; i < NUM_RTX_CODE; i++) + { + const char **f; + + if (special_format (defs[i].format)) + continue; + + for (f = formats; *f; f++) + if (! strcmp (*f, defs[i].format)) + break; + + if (*f == 0) + *f = defs[i].format; + } +} + + +/* Generate macros to generate RTL of code IDX using the functions we + write. */ + +static void +genmacro (int idx) +{ + const char *p; + int i; + + /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to + gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */ + + if (excluded_rtx (idx)) + /* Don't define a macro for this code. */ + return; + + printf ("#define gen_rtx_%s%s(MODE", + special_rtx (idx) ? "raw_" : "", defs[idx].enumname); + + for (p = defs[idx].format, i = 0; *p != 0; p++) + if (*p != '0') + printf (", ARG%d", i++); + + printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)", + defs[idx].format, defs[idx].enumname); + + for (p = defs[idx].format, i = 0; *p != 0; p++) + if (*p != '0') + printf (", (ARG%d)", i++); + + puts (")"); +} + +/* Generate the code for the function to generate RTL whose + format is FORMAT. */ + +static void +gendef (const char *format) +{ + const char *p; + int i, j; + + /* Start by writing the definition of the function name and the types + of the arguments. */ + + printf ("static inline rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format); + for (p = format, i = 0; *p != 0; p++) + if (*p != '0') + printf (",\n\t%sarg%d", type_from_format (*p), i++); + + puts (" MEM_STAT_DECL)"); + + /* Now write out the body of the function itself, which allocates + the memory and initializes it. */ + puts ("{"); + puts (" rtx rt;"); + puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n"); + + puts (" PUT_MODE (rt, mode);"); + + for (p = format, i = j = 0; *p ; ++p, ++i) + if (*p != '0') + printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++); + else + printf (" X0EXP (rt, %d) = NULL_RTX;\n", i); + + puts ("\n return rt;\n}\n"); + printf ("#define gen_rtx_fmt_%s(c, m", format); + for (p = format, i = 0; *p != 0; p++) + if (*p != '0') + printf (", p%i",i++); + printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format); + for (p = format, i = 0; *p != 0; p++) + if (*p != '0') + printf (", p%i",i++); + printf (" MEM_STAT_INFO)\n\n"); +} + +/* Generate the documentation header for files we write. */ + +static void +genlegend (void) +{ + puts ("/* Generated automatically by gengenrtl from rtl.def. */\n"); +} + +/* Generate the text of the header file we make, genrtl.h. */ + +static void +genheader (void) +{ + unsigned int i; + const char **fmt; + + puts ("#ifndef GCC_GENRTL_H"); + puts ("#define GCC_GENRTL_H\n"); + puts ("#include \"statistics.h\"\n"); + + for (fmt = formats; *fmt; ++fmt) + gendef (*fmt); + + putchar ('\n'); + + for (i = 0; i < NUM_RTX_CODE; i++) + if (! special_format (defs[i].format)) + genmacro (i); + + puts ("\n#endif /* GCC_GENRTL_H */"); +} + +/* This is the main program. */ + +int +main (void) +{ + find_formats (); + genlegend (); + + genheader (); + + if (ferror (stdout) || fflush (stdout) || fclose (stdout)) + return FATAL_EXIT_CODE; + + return SUCCESS_EXIT_CODE; +} |