| /* Generate code from machine description to extract operands from insn as rtl. |
| Copyright (C) 1987-2017 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" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "rtl.h" |
| #include "errors.h" |
| #include "read-md.h" |
| #include "gensupport.h" |
| |
| /* This structure contains all the information needed to describe one |
| set of extractions methods. Each method may be used by more than |
| one pattern if the operands are in the same place. |
| |
| The string for each operand describes that path to the operand and |
| contains `0' through `9' when going into an expression and `a' through |
| `z' when going into a vector. We assume here that only the first operand |
| of an rtl expression is a vector. genrecog.c makes the same assumption |
| (and uses the same representation) and it is currently true. */ |
| |
| typedef char *locstr; |
| |
| struct extraction |
| { |
| unsigned int op_count; |
| unsigned int dup_count; |
| locstr *oplocs; |
| locstr *duplocs; |
| int *dupnums; |
| struct code_ptr *insns; |
| struct extraction *next; |
| }; |
| |
| /* Holds a single insn code that uses an extraction method. */ |
| struct code_ptr |
| { |
| int insn_code; |
| struct code_ptr *next; |
| }; |
| |
| /* All extractions needed for this machine description. */ |
| static struct extraction *extractions; |
| |
| /* All insn codes for old-style peepholes. */ |
| static struct code_ptr *peepholes; |
| |
| /* This structure is used by gen_insn and walk_rtx to accumulate the |
| data that will be used to produce an extractions structure. */ |
| |
| |
| struct accum_extract |
| { |
| accum_extract () : oplocs (10), duplocs (10), dupnums (10), pathstr (20) {} |
| |
| auto_vec<locstr> oplocs; |
| auto_vec<locstr> duplocs; |
| auto_vec<int> dupnums; |
| auto_vec<char> pathstr; |
| }; |
| |
| /* Forward declarations. */ |
| static void walk_rtx (md_rtx_info *, rtx, struct accum_extract *); |
| |
| static void |
| gen_insn (md_rtx_info *info) |
| { |
| int i; |
| unsigned int op_count, dup_count, j; |
| struct extraction *p; |
| struct code_ptr *link; |
| struct accum_extract acc; |
| |
| /* Walk the insn's pattern, remembering at all times the path |
| down to the walking point. */ |
| |
| rtx insn = info->def; |
| if (XVECLEN (insn, 1) == 1) |
| walk_rtx (info, XVECEXP (insn, 1, 0), &acc); |
| else |
| for (i = XVECLEN (insn, 1) - 1; i >= 0; i--) |
| { |
| acc.pathstr.safe_push ('a' + i); |
| walk_rtx (info, XVECEXP (insn, 1, i), &acc); |
| acc.pathstr.pop (); |
| } |
| |
| link = XNEW (struct code_ptr); |
| link->insn_code = info->index; |
| |
| /* See if we find something that already had this extraction method. */ |
| |
| op_count = acc.oplocs.length (); |
| dup_count = acc.duplocs.length (); |
| gcc_assert (dup_count == acc.dupnums.length ()); |
| |
| for (p = extractions; p; p = p->next) |
| { |
| if (p->op_count != op_count || p->dup_count != dup_count) |
| continue; |
| |
| for (j = 0; j < op_count; j++) |
| { |
| char *a = p->oplocs[j]; |
| char *b = acc.oplocs[j]; |
| if (a != b && (!a || !b || strcmp (a, b))) |
| break; |
| } |
| |
| if (j != op_count) |
| continue; |
| |
| for (j = 0; j < dup_count; j++) |
| if (p->dupnums[j] != acc.dupnums[j] |
| || strcmp (p->duplocs[j], acc.duplocs[j])) |
| break; |
| |
| if (j != dup_count) |
| continue; |
| |
| /* This extraction is the same as ours. Just link us in. */ |
| link->next = p->insns; |
| p->insns = link; |
| return; |
| } |
| |
| /* Otherwise, make a new extraction method. We stash the arrays |
| after the extraction structure in memory. */ |
| |
| p = XNEWVAR (struct extraction, sizeof (struct extraction) |
| + op_count*sizeof (char *) |
| + dup_count*sizeof (char *) |
| + dup_count*sizeof (int)); |
| p->op_count = op_count; |
| p->dup_count = dup_count; |
| p->next = extractions; |
| extractions = p; |
| p->insns = link; |
| link->next = 0; |
| |
| p->oplocs = (char **)((char *)p + sizeof (struct extraction)); |
| p->duplocs = p->oplocs + op_count; |
| p->dupnums = (int *)(p->duplocs + dup_count); |
| |
| memcpy (p->oplocs, acc.oplocs.address (), op_count * sizeof (locstr)); |
| memcpy (p->duplocs, acc.duplocs.address (), dup_count * sizeof (locstr)); |
| memcpy (p->dupnums, acc.dupnums.address (), dup_count * sizeof (int)); |
| } |
| |
| /* Helper subroutine of walk_rtx: given a vec<locstr>, an index, and a |
| string, insert the string at the index, which should either already |
| exist and be NULL, or not yet exist within the vector. In the latter |
| case the vector is enlarged as appropriate. INFO describes the |
| containing define_* expression. */ |
| static void |
| VEC_safe_set_locstr (md_rtx_info *info, vec<locstr> *vp, |
| unsigned int ix, char *str) |
| { |
| if (ix < (*vp).length ()) |
| { |
| if ((*vp)[ix]) |
| { |
| message_at (info->loc, "repeated operand number %d", ix); |
| have_error = 1; |
| } |
| else |
| (*vp)[ix] = str; |
| } |
| else |
| { |
| while (ix > (*vp).length ()) |
| vp->safe_push (NULL); |
| vp->safe_push (str); |
| } |
| } |
| |
| /* Another helper subroutine of walk_rtx: given a vec<char>, convert it |
| to a NUL-terminated string in malloc memory. */ |
| static char * |
| VEC_char_to_string (vec<char> v) |
| { |
| size_t n = v.length (); |
| char *s = XNEWVEC (char, n + 1); |
| memcpy (s, v.address (), n); |
| s[n] = '\0'; |
| return s; |
| } |
| |
| static void |
| walk_rtx (md_rtx_info *info, rtx x, struct accum_extract *acc) |
| { |
| RTX_CODE code; |
| int i, len, base; |
| const char *fmt; |
| |
| if (x == 0) |
| return; |
| |
| code = GET_CODE (x); |
| switch (code) |
| { |
| case PC: |
| case CC0: |
| case CONST_INT: |
| case SYMBOL_REF: |
| return; |
| |
| case MATCH_OPERAND: |
| case MATCH_SCRATCH: |
| VEC_safe_set_locstr (info, &acc->oplocs, XINT (x, 0), |
| VEC_char_to_string (acc->pathstr)); |
| break; |
| |
| case MATCH_OPERATOR: |
| case MATCH_PARALLEL: |
| VEC_safe_set_locstr (info, &acc->oplocs, XINT (x, 0), |
| VEC_char_to_string (acc->pathstr)); |
| |
| base = (code == MATCH_OPERATOR ? '0' : 'a'); |
| for (i = XVECLEN (x, 2) - 1; i >= 0; i--) |
| { |
| acc->pathstr.safe_push (base + i); |
| walk_rtx (info, XVECEXP (x, 2, i), acc); |
| acc->pathstr.pop (); |
| } |
| return; |
| |
| case MATCH_DUP: |
| case MATCH_PAR_DUP: |
| case MATCH_OP_DUP: |
| acc->duplocs.safe_push (VEC_char_to_string (acc->pathstr)); |
| acc->dupnums.safe_push (XINT (x, 0)); |
| |
| if (code == MATCH_DUP) |
| break; |
| |
| base = (code == MATCH_OP_DUP ? '0' : 'a'); |
| for (i = XVECLEN (x, 1) - 1; i >= 0; i--) |
| { |
| acc->pathstr.safe_push (base + i); |
| walk_rtx (info, XVECEXP (x, 1, i), acc); |
| acc->pathstr.pop (); |
| } |
| return; |
| |
| default: |
| break; |
| } |
| |
| fmt = GET_RTX_FORMAT (code); |
| len = GET_RTX_LENGTH (code); |
| for (i = 0; i < len; i++) |
| { |
| if (fmt[i] == 'e' || fmt[i] == 'u') |
| { |
| acc->pathstr.safe_push ('0' + i); |
| walk_rtx (info, XEXP (x, i), acc); |
| acc->pathstr.pop (); |
| } |
| else if (fmt[i] == 'E') |
| { |
| int j; |
| for (j = XVECLEN (x, i) - 1; j >= 0; j--) |
| { |
| acc->pathstr.safe_push ('a' + j); |
| walk_rtx (info, XVECEXP (x, i, j), acc); |
| acc->pathstr.pop (); |
| } |
| } |
| } |
| } |
| |
| /* Given a PATH, representing a path down the instruction's |
| pattern from the root to a certain point, output code to |
| evaluate to the rtx at that point. */ |
| |
| static void |
| print_path (const char *path) |
| { |
| int len = strlen (path); |
| int i; |
| |
| if (len == 0) |
| { |
| /* Don't emit "pat", since we may try to take the address of it, |
| which isn't what is intended. */ |
| fputs ("PATTERN (insn)", stdout); |
| return; |
| } |
| |
| /* We first write out the operations (XEXP or XVECEXP) in reverse |
| order, then write "pat", then the indices in forward order. */ |
| |
| for (i = len - 1; i >= 0 ; i--) |
| { |
| if (ISLOWER (path[i])) |
| fputs ("XVECEXP (", stdout); |
| else if (ISDIGIT (path[i])) |
| fputs ("XEXP (", stdout); |
| else |
| gcc_unreachable (); |
| } |
| |
| fputs ("pat", stdout); |
| |
| for (i = 0; i < len; i++) |
| { |
| if (ISLOWER (path[i])) |
| printf (", 0, %d)", path[i] - 'a'); |
| else if (ISDIGIT (path[i])) |
| printf (", %d)", path[i] - '0'); |
| else |
| gcc_unreachable (); |
| } |
| } |
| |
| static void |
| print_header (void) |
| { |
| /* N.B. Code below avoids putting squiggle braces in column 1 inside |
| a string, because this confuses some editors' syntax highlighting |
| engines. */ |
| |
| puts ("\ |
| /* Generated automatically by the program `genextract'\n\ |
| from the machine description file `md'. */\n\ |
| \n\ |
| #include \"config.h\"\n\ |
| #include \"system.h\"\n\ |
| #include \"coretypes.h\"\n\ |
| #include \"tm.h\"\n\ |
| #include \"rtl.h\"\n\ |
| #include \"insn-config.h\"\n\ |
| #include \"recog.h\"\n\ |
| #include \"diagnostic-core.h\"\n\ |
| \n\ |
| /* This variable is used as the \"location\" of any missing operand\n\ |
| whose numbers are skipped by a given pattern. */\n\ |
| static rtx junk ATTRIBUTE_UNUSED;\n"); |
| |
| puts ("\ |
| void\n\ |
| insn_extract (rtx_insn *insn)\n{\n\ |
| rtx *ro = recog_data.operand;\n\ |
| rtx **ro_loc = recog_data.operand_loc;\n\ |
| rtx pat = PATTERN (insn);\n\ |
| int i ATTRIBUTE_UNUSED; /* only for peepholes */\n\ |
| \n\ |
| if (flag_checking)\n\ |
| {\n\ |
| memset (ro, 0xab, sizeof (*ro) * MAX_RECOG_OPERANDS);\n\ |
| memset (ro_loc, 0xab, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n\ |
| }\n"); |
| |
| puts ("\ |
| switch (INSN_CODE (insn))\n\ |
| {\n\ |
| default:\n\ |
| /* Control reaches here if insn_extract has been called with an\n\ |
| unrecognizable insn (code -1), or an insn whose INSN_CODE\n\ |
| corresponds to a DEFINE_EXPAND in the machine description;\n\ |
| either way, a bug. */\n\ |
| if (INSN_CODE (insn) < 0)\n\ |
| fatal_insn (\"unrecognizable insn:\", insn);\n\ |
| else\n\ |
| fatal_insn (\"insn with invalid code number:\", insn);\n"); |
| } |
| |
| int |
| main (int argc, const char **argv) |
| { |
| unsigned int i; |
| struct extraction *p; |
| struct code_ptr *link; |
| const char *name; |
| |
| progname = "genextract"; |
| |
| if (!init_rtx_reader_args (argc, argv)) |
| return (FATAL_EXIT_CODE); |
| |
| /* Read the machine description. */ |
| |
| md_rtx_info info; |
| while (read_md_rtx (&info)) |
| switch (GET_CODE (info.def)) |
| { |
| case DEFINE_INSN: |
| gen_insn (&info); |
| break; |
| |
| case DEFINE_PEEPHOLE: |
| { |
| struct code_ptr *link = XNEW (struct code_ptr); |
| |
| link->insn_code = info.index; |
| link->next = peepholes; |
| peepholes = link; |
| } |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (have_error) |
| return FATAL_EXIT_CODE; |
| |
| print_header (); |
| |
| /* Write out code to handle peepholes and the insn_codes that it should |
| be called for. */ |
| if (peepholes) |
| { |
| for (link = peepholes; link; link = link->next) |
| printf (" case %d:\n", link->insn_code); |
| |
| /* The vector in the insn says how many operands it has. |
| And all it contains are operands. In fact, the vector was |
| created just for the sake of this function. We need to set the |
| location of the operands for sake of simplifications after |
| extraction, like eliminating subregs. */ |
| puts (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n" |
| " ro[i] = *(ro_loc[i] = &XVECEXP (pat, 0, i));\n" |
| " break;\n"); |
| } |
| |
| /* Write out all the ways to extract insn operands. */ |
| for (p = extractions; p; p = p->next) |
| { |
| for (link = p->insns; link; link = link->next) |
| { |
| i = link->insn_code; |
| name = get_insn_name (i); |
| if (name) |
| printf (" case %d: /* %s */\n", i, name); |
| else |
| printf (" case %d:\n", i); |
| } |
| |
| for (i = 0; i < p->op_count; i++) |
| { |
| if (p->oplocs[i] == 0) |
| { |
| printf (" ro[%d] = const0_rtx;\n", i); |
| printf (" ro_loc[%d] = &junk;\n", i); |
| } |
| else |
| { |
| printf (" ro[%d] = *(ro_loc[%d] = &", i, i); |
| print_path (p->oplocs[i]); |
| puts (");"); |
| } |
| } |
| |
| for (i = 0; i < p->dup_count; i++) |
| { |
| printf (" recog_data.dup_loc[%d] = &", i); |
| print_path (p->duplocs[i]); |
| puts (";"); |
| printf (" recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]); |
| } |
| |
| puts (" break;\n"); |
| } |
| |
| puts (" }\n}"); |
| fflush (stdout); |
| return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); |
| } |