pike.git/bin/mktreeopt.pike:1b19b643765dd02991fc8aa72195cab868a9d544

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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 /* * Generates tree-transformation code from a specification. * * Henrik Grubbström 1999-11-06 */ #pragma strict_types /* * Input format: * * Input is first stripped of //-style comments. * Then it is parsed with the following pseudo-BNF grammar: * * source: * | source rule; * * rule: match ':' transform ';' * | match ':' action ';'; * * match: tag '=' id conditionals children * | tag conditionals children * | id conditionals children * | '$' tag conditionals children * | '-' conditionals; * * tag: number * | tag number; * * number: '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'; * * id: identifier * | '\'' any '\'' * | '\'' '\\' any '\'' * | '*' * | '+'; * * identifier: uppercase * | identifier uppercase; * * conditionals: * | conditionals conditional; * * conditional: '[' expression ']'; * * children: * | '(' match ',' match ')'; * * transform: identifier '(' transform ',' transform ')' * | '\'' any '\'' '(' transform ',' transform ')' * | '\'' '\\' any '\'' '(' transform ',' transform ')' * | '-' * | '$' tag * | tag; * * action: '{' code '}'; * * uppercase: 'A' | 'B' | 'C' | 'D' | 'E' | 'F' | 'G' | 'H' | 'I' * | 'J' | 'K' | 'L' | 'M' | 'N' | 'O' | 'P' | 'Q' | 'R' * | 'S' | 'T' | 'U' | 'V' | 'W' | 'X' | 'Y' | 'Z' | '_'; * */ /* * Matching: * * A tag without conditionals has the implicit symbol '*'. * A tag with conditionals has the implicit symbol '+'. * A rule must begin with a token match. * * Symbol Matches against * ---------------------------------------------------------------------- * identifier node->token. * '\'' any '\'' node->token. * '\'' '\\' any '\'' node->token. * '-' NULL. * '*' ANY. * '+' NOT NULL. * '$' tag Prior occurrance of the tag (SHARED_NODES). * */ /* * Conditionals: * * During evaluation of the expression $$ refers to the current node, * and $tag to prior tagged nodes. * */ /* * Transforms: * * Symbol Resulting node * ---------------------------------------------------------------------- * identifier New node with identifier as the token. * '\'' any '\'' New node with symbol as the token. * '\'' '\\' any '\'' New node with symbol as the token. * '$' tag Node tagged during matching. * tag New integer node. * '-' NULL. * */ /* * Actions: * * During actions $tag referrs to nodes tagged during matching, and $$ to * the result node. * * NOTE: Code after the assignment of $$ will not be executed * (a goto will be inserted). * * NOTE: $tag nodes used in the $$ assignment expression will be freed * as needed. */ /* * Notes about the generated code: * * The node to be examined can have 4 basic configurations: * * X X X X * / \ / \ / \ / \ * - - - X X - X X * * The node is then matched against the 16 kinds of match nodes: * * X X X X * / \ / \ / \ / \ * - - - X - + - * * * X X X X * / \ / \ / \ / \ * X - X X X + X * * * X X X X * / \ / \ / \ / \ * + - + X + + + * * * X X X X * / \ / \ / \ / \ * * - * X * + * * * * Since + behaves closely like X, they will be grouped together in the * tables below. * * The match-order is determined by the manhattan distance from the node * * X * / \ * - - * * in the table above. ie: * * X X X X X * / \ -> / \ / \ / \ / \ * - - - - - * * - * * * * X X X X X * / \ -> / \ / \ / \ / \ * - X - X - * * X * * * * X X X X X * / \ -> / \ / \ / \ / \ * X - X - * - X * * * * * X X X X X * / \ -> / \ / \ / \ / \ * X X X X * X X * * * * * The first part of the table expanded with the implicit +-nodes: * * X X * / \ -> / \ * - - - - * * X X X * / \ -> / \ / \ * - X - X - + * * X X X * / \ -> / \ / \ * X - X - + - * * X X X X X * / \ -> / \ / \ / \ / \ * X X X X + X X + + + * * Which would be much easier to generate code for, since every match node * occurrs exactly once, and no goto's would be needed. * * * Pseudocode: (Real code needs fixing...) * * if (!car(n)) { * if (!cdr(n)) { * // Code for NULL-NULL * } else { * // Code for NULL-X * // Code for NULL-PLUS * } * // Code for NULL-ANY * if (!cdr(n)) { * goto ANY_NULL; * } * goto ANY_X; * } else if (!cdr(n)) { * // Code for X-NULL * // Code for PLUS-NULL * ANY_NULL: * // Code for ANY-NULL * if (car(n)) { * goto X_ANY; * } * } else { * // Code for X-X * // Code for X-PLUS * // Code for PLUS-X * // Code for PLUS-PLUS * X_ANY: * // Code for X-ANY * // Code for PLUS-ANY * if (cdr(n)) { * ANY_X: * // Code for ANY-X * // Code for ANY-PLUS * } * } * // Code for ANY-ANY */ constant header = #"/* Tree transformation code. * * This file was generated from %O. * * Do NOT edit! */ #ifdef PIKE_DEBUG #define DBG(X) if (l_flag>4) { fprintf(stderr, (X)); } #else #define DBG(X) #endif "; mapping(string: array(object(node))) rules = ([]); void fail(string msg, mixed ... args) { werror(msg, @args); exit(7); /* distinctive error... */ } string fname; string data = ""; string tpos = ""; int pos; int line = 1; array(string) marks = allocate(10); void eat_whitespace() { while ((pos < sizeof(data)) && (< '\n', ' ', '\t', '\r' >)[data[pos]]) { line += (data[pos] == '\n'); pos++; } } int read_int() { int start = pos; while ((pos < sizeof(data)) && ('0' <= data[pos]) && (data[pos] <= '9')) { pos++; } return (int) data[start..pos-1]; } string read_id() { int start = pos; int c; if (data[pos] == '\'') { pos++; if (data[pos] == '\\') { pos++; } pos++; expect('\''); return data[start..pos-1] ; } while ((pos < sizeof(data)) && (((c = data[pos]) == '_') || (('A' <= c) && (c <= 'Z')) || (c == '*') || (c == '+'))) { pos++; } return data[start..pos-1]; } void expect(int c) { if (data[pos] != c) { fail("%s:%d: Expected '%c', got '%c'\n", fname, line, c, data[pos]); } pos++; } int node_cnt; class node { int tag = -1; string token = "*"; string tpos; array(string) extras = ({}); object(node)|string car, cdr; // 0 == Ignored. object(node)|string real_car, real_cdr; object(node) parent; string action; int node_id = node_cnt++; object(node) _copy() { object(node) n = node(); // werror(sprintf("Copy called on node %s\n", this_object())); n->tag = tag; n->tpos = tpos; n->token = token; n->extras = extras; if (objectp(real_car)) { n->real_car = real_car->_copy(); n->real_car->parent = n; n->car = car && n->real_car; } else { n->real_car = real_car; n->car = car; } if (objectp(real_cdr)) { n->real_cdr = real_cdr->_copy(); n->real_cdr->parent = n; n->cdr = cdr && n->real_cdr; } else { n->real_cdr = real_cdr; n->cdr = cdr; } n->action = action; return n; } object(node) copy() { if (parent) { if (parent->real_car == this_object()) { return [object(node)]parent->copy()->real_car; } return [object(node)]parent->copy()->real_cdr; } return _copy(); } string _sprintf() { string s = token; if (tag >= 0) { s = sprintf("%d = %s", tag, token); } s += "{" + node_id + "}"; foreach(extras, string e) { s += "[" + e + "]"; } if (!(< "*", "-" >)[token]) { if (real_car || real_cdr) { s += "("; if (objectp(real_car)) { s += real_car->_sprintf(); } else if (real_car) { s += "$" + real_car + "$"; } else { s += "*"; } s += ", "; if (objectp(real_cdr)) { s += real_cdr->_sprintf(); } else if (real_cdr) { s += "$" + real_cdr + "$"; } else { s += "*"; } s += ")"; } } return s; } array(string) used_nodes() { if (token == "*") { return ({ sprintf("C%sR(n)", tpos) }); } array(string) res = ({}); if (objectp(car)) { res += car->used_nodes(); } if (objectp(cdr)) { res += cdr->used_nodes(); } return res; } string generate_code() { if (token == "-") return "0"; if (token == "*") { if (sizeof(tpos)) { return sprintf("C%sR(n)", tpos); } else { return "n"; } } if (token == "T_INT") { return sprintf("mkintnode(%d)", tag); } return sprintf("mknode(%s, %s, %s)", token, car?car->generate_code():"0", cdr?cdr->generate_code():"0"); } } string fix_extras(string s) { array(string) a = s/"$"; for(int i=1; i < sizeof(a); i++) { string pos; if (a[i] == "") { // $$ pos = tpos; i++; } else { int tag; sscanf(a[i], "%d%s", tag, a[i]); if (!(pos = marks[tag])) { fail("%s:%d: Unknown tag %d\n", fname, line, tag); } } if (sizeof(pos)) { a[i] = sprintf("C%sR(n)", pos) + a[i]; } else { a[i] = "n" + a[i]; } } return a * ""; } void read_car_cdr(object(node) res, array(string) linepos) { int c = data[pos]; if (c == '(') { string otpos = tpos; pos++; tpos = "A"+otpos; if (data[pos] == '$') { // FIXME: Support for recurring nodes. // Useful for common subexpression elimination. pos++; int tag = read_int(); string ntpos; if (!(ntpos = marks[tag])) { fail("%s:%d: Tag $%d used before being defined.\n", fname, line, tag); } else if (ntpos == "") { fail("%s:%d: Tag $%d is the root, and can't be used for " "exact matching.\n", fname, line, tag); } else { // FIXME: Ought to check that the tag isn't for one of our parents. res->car = res->real_car = sprintf("C%sR(n)", ntpos); } eat_whitespace(); } else { res->car = res->real_car = read_node(linepos); } expect(','); eat_whitespace(); tpos = "D"+otpos; if (data[pos] == '$') { // FIXME: Support for recurring nodes. // Useful for common subexpression elimination. pos++; int tag = read_int(); string ntpos; if (!(ntpos = marks[tag])) { fail("%s:%d: Tag $%d used before being defined.\n", fname, line, tag); } else if (ntpos == "") { fail("%s:%d: Tag $%d is the root, and can't be used for " "exact matching.\n", fname, line, tag); } else { // FIXME: Ought to check that the tag isn't for one of our parents. res->cdr = res->real_cdr = sprintf("C%sR(n)", ntpos); } eat_whitespace(); } else { res->cdr = res->real_cdr = read_node(linepos); } tpos = otpos; expect(')'); eat_whitespace(); } } constant f_op_name_lookup = ([ "F_LT": "f_lt", "F_GT": "f_gt", "F_LE": "f_le", "F_GE": "f_ge", "F_EQ": "f_eq", "F_NE": "f_ne", "F_ADD": "f_add", "F_SUBTRACT": "f_subtract", "F_DIVIDE": "f_divide", "F_MULTIPLY": "f_multiply", "F_MOD": "f_mod", "F_LSH": "f_lsh", "F_RSH": "f_rsh", "F_OR": "f_or", "F_AND": "f_and", "F_XOR": "f_xor", "F_NOT": "f_not", "F_COMPL": "f_compl", ]); object(node) read_node(array(string) linepos) { object(node) res = node(); eat_whitespace(); int c = data[pos]; if (c == '#') { // Line number information holder. linepos[0] = tpos; pos++; eat_whitespace(); c = data[pos]; if ((c != '=') && (c != '[')) { // Implicit any node converted to plus node. res->token = "+"; return res; } if (c == '=') { pos++; eat_whitespace(); c = data[pos]; } } if (('0' <= c) && (c <= '9')) { res->tag = read_int(); if (marks[res->tag]) { fail("%s:%d: Tag %d used twice\n", fname, line, res->tag); } marks[res->tag] = tpos; eat_whitespace(); c = data[pos]; if ((c != '=') && (c != '[')) return res; if (c == '=') { pos++; eat_whitespace(); } c = data[pos]; } if (c == '-') { res->token = data[pos..pos]; pos++; eat_whitespace(); } else { string token = read_id(); if (sizeof(token)) { res->token = token; } eat_whitespace(); c = data[pos]; while (c == '[') { if (token == "*") { fail("%s:%d: *-nodes can't have conditionals.\n", fname, line); } if (res->token == "*") { // Implicit any node converted to plus node. res->token = "+"; } pos++; int cnt = 1; int start = pos; while (cnt) { c = data[pos++]; if (c == '[') { cnt++; } else if (c == ']') { cnt--; } else if (c == '\n') { line++; } } res->extras += ({ fix_extras(data[start..pos-2]) }); eat_whitespace(); c = data[pos]; } string f_op_name = f_op_name_lookup[token]; if (f_op_name) { // We need to convert the short-hand notation to // an actual operator call node. res->token = "F_APPLY"; // Match the corresponding constant efun value. node match = node(); match->token = "F_CONSTANT"; res->car = res->real_car = match; string otpos = tpos; tpos = "A" + tpos; match->extras = map(({ "TYPEOF($$->u.sval) == T_FUNCTION", "SUBTYPEOF($$->u.sval) == FUNCTION_BUILTIN", "$$->u.sval.u.efun->function == " + f_op_name, }), fix_extras); tpos = "D" + otpos; // Read the arguments (if any) into an F_ARG_LIST node. node args = node(); args->token = "F_ARG_LIST"; res->cdr = res->real_cdr = args; read_car_cdr(args, linepos); tpos = otpos; if (!args->car && !args->cdr) { // No argument matching needed. res->cdr = 0; } } else { read_car_cdr(res, linepos); } if ((res->token == "*") && !sizeof(res->extras) && !res->car && !res->cdr) { // No need to consider this node. return 0; } } return res; } string fix_action(string s) { array(string) a = s/"$$"; for(int i=1; i < sizeof(a); i++) { int j = search(a[i], ";"); if (j < 0) { fail("%s:%d: Syntax error in $$ statement\n", fname, line); } string new_node = a[i][..j]; string rest = a[i][j+1..]; array(string) b = new_node/"$"; mapping(string:int) used_nodes = ([]); for(int j=1; j < sizeof(b); j++) { int tag = -1; sscanf(b[j], "%d%s", tag, b[j]); if (!marks[tag]) { fail("%s:%s: Unknown tag: $%d\n", fname, line, tag); } if (sizeof(marks[tag])) { string expr = sprintf("C%sR(n)", marks[tag]); used_nodes[expr]++; b[j] = expr + b[j]; } else { fail("%s:%d: Use of the main node to generate a new node " "is not supported\n", fname, line); } } new_node = b * ""; string pre_cleanup = "\n"; string post_cleanup = "\n"; if (sizeof(used_nodes)) { pre_cleanup = "\n"; post_cleanup = "\n "; foreach(sort(indices(used_nodes)), string used_node) { pre_cleanup += (" ADD_NODE_REF2(" + used_node + ",\n")* used_nodes[used_node]; post_cleanup += ")" * used_nodes[used_node]; } pre_cleanup += " "; post_cleanup += ";\n"; } a[i] = pre_cleanup + " tmp1" + new_node + post_cleanup + " goto use_tmp1;" + rest; } s = a * ""; a = s/"$"; for(int i=1; i < sizeof(a); i++) { int tag = -1; sscanf(a[i], "%d%s", tag, a[i]); if (!marks[tag]) { fail("%s:%s: Unknown tag: $%d\n", fname, line, tag); } if (sizeof(marks[tag])) { a[i] = sprintf("C%sR(n)", marks[tag]) + a[i]; } else { a[i] = "n" + a[i]; } } return a * ""; } object(node) read_node2() { object(node) res = node(); eat_whitespace(); int c = data[pos]; if (c == '$') { pos++; res->tag = read_int(); eat_whitespace(); if (!marks[res->tag]) { fail("%s:%d: Undefined tag %d\n", fname, line, res->tag); } res->tpos = marks[res->tag]; return res; } if (c == '-') { pos++; c = data[pos]; if (('0' <= c) && (c <= '9')) { // Negative mkintnode. res->token = "T_INT"; res->tag = -read_int(); eat_whitespace(); return res; } else { res->token = "-"; eat_whitespace(); return res; } } else if (('0' <= c) && (c <= '9')) { // mkintnode. res->token = "T_INT"; res->tag = read_int(); eat_whitespace(); return res; } if (c == '-') { pos++; res->token = "-"; eat_whitespace(); return res; } res->token = read_id(); eat_whitespace(); c = data[pos]; if (c == '(') { pos++; res->car = read_node2(); expect(','); res->cdr = read_node2(); expect(')'); eat_whitespace(); } else { res->car = node(); res->cdr = node(); } return res; } void parse_data() { // Get rid of comments array(string) a = data/"//"; for(int i=1; i < sizeof(a); i++) { int j = search(a[i], "\n"); if (j >= 0) { // Note: Keep the NL. a[i] = a[i][j..]; } else { a[i] = ""; } } data = a*""; a = 0; eat_whitespace(); while (pos < sizeof(data)) { marks = allocate(10); array(string) linepos = ({ "" }); object(node) n = read_node(linepos); // werror(sprintf("%s:\n", n)); if (rules[n->token]) { rules[n->token] += ({ n }); } else { rules[n->token] = ({ n }); } eat_whitespace(); expect(':'); eat_whitespace(); string action; if (data[pos] == '{') { // Code. int cnt = 1; int start = pos++; while (cnt) { int c = data[pos++]; if (c == '{') { cnt++; } else if (c == '}') { cnt--; } else if (c == '\n') { line++; } } action = fix_action(data[start..pos-1]); } else if (data[pos] != ';') { object(node) n2 = read_node2(); // werror(sprintf("\t%s;\n\n", n2)); array(string) t = [array(string)]n2->used_nodes(); string expr = n2->generate_code(); // Some optimizations for common cases switch(expr) { case "0": action = "goto zap_node;"; break; case "CAR(n)": action = "goto use_car;"; break; case "CDR(n)": action = "goto use_cdr;"; break; default: string pre_fix_refs = ""; string post_fix_refs = ""; if (sizeof(t)) { pre_fix_refs = " ADD_NODE_REF2(" + t * ",\n ADD_NODE_REF2(" + ",\n "; post_fix_refs = " " + (")" * sizeof(t)) + ";\n"; } action = sprintf("{\n" "%s" " tmp1 = %s;\n" "%s" " goto use_tmp1;\n" "}", pre_fix_refs, expr, post_fix_refs); break; } action = sprintf("DBG(\"=> \"%O\"\\n\");\n", sprintf("%s", n2)) + action; } else { // Null action. // Used to force code generation for eg NULL-detection. // Obsolete. action = ""; } if (linepos[0] != "") { // Update with linenumber information. action = sprintf("#ifdef PIKE_DEBUG\n" " if (l_flag > 4) {\n" " fprintf(stderr,\n" " \"Setting line position to %%s:%%ld\\n\",\n" " C%sR(n)->current_file->str,\n" " (long)C%sR(n)->line_number);\n" " }\n" "#endif /* PIKE_DEBUG */\n" "c->lex.current_line = C%sR(n)->line_number;\n" "c->lex.current_file = C%sR(n)->current_file;\n", linepos[0], linepos[0], linepos[0], linepos[0]) + action; } action = sprintf("DBG(\"Match: \"%O\"\\n\");\n", sprintf("%s", n)) + action; n->action = action; eat_whitespace(); expect(';'); eat_whitespace(); } } string do_indent(string code, string indent) { array(string) a = code/"\n"; for(int i = 0; i < sizeof(a); i++) { if (sizeof(a[i]) && (a[i][0] != '#')) { a[i] = indent + a[i]; } } return a*"\n"; } void zap_car(array(object(node)) node_set) { foreach(node_set, object(node) n) { n->car = 0; } } void zap_cdr(array(object(node)) node_set) { foreach(node_set, object(node) n) { n->cdr = 0; } } constant NULL_CAR = 0; constant EXACT_CAR = 1; constant NULL_CDR = 2; constant MATCH_CAR = 3; constant NOT_NULL_CAR = 4; constant EXACT_CDR = 5; constant MATCH_CDR = 6; constant NOT_NULL_CDR = 7; constant ANY = 8; constant ANY_CAR = 9; constant ANY_CDR = 10; protected int label_cnt; int debug; string generate_match(array(object(node)) rule_set, string indent) { string res = ""; if (debug) { werror(indent + sprintf("generate_match(%s)\n", rule_set->_sprintf() * ", ")); } // Group the nodes by their class: array(array(object(node))) node_classes = allocate(11, ({})); foreach(rule_set, object(node) n) { int car_kind = ANY; if (n->car) { if (stringp(n->car)) { // EXACT car_kind = EXACT_CAR; } else if (n->car->token == "-") { // NULL car_kind = NULL_CAR; } else if (n->car->token == "+") { // PLUS car_kind = NOT_NULL_CAR; } else if (n->car->token != "*") { // X car_kind = MATCH_CAR; } } int cdr_kind = ANY; if (n->cdr) { if (stringp(n->cdr)) { // EXACT cdr_kind = EXACT_CDR; } else if (n->cdr->token == "-") { // NULL cdr_kind = NULL_CDR; } else if (n->cdr->token == "+") { // PLUS cdr_kind = NOT_NULL_CDR; } else if (n->cdr->token != "*") { // X cdr_kind = MATCH_CDR; } } if (car_kind < cdr_kind) { node_classes[car_kind] += ({ n }); } else { node_classes[cdr_kind] += ({ n }); } if (car_kind != cdr_kind) { if (car_kind == ANY && cdr_kind == NOT_NULL_CDR) { node_classes[ANY_CAR] += ({ n->copy() }); } else if (cdr_kind == ANY && car_kind == NOT_NULL_CAR) { node_classes[ANY_CDR] += ({ n->copy() }); } } if (debug) { werror(indent + sprintf("generate_match(%s)\n", n)); werror(indent + sprintf("car_kind: %d, cdr_kind: %d\n", car_kind, cdr_kind)); } } if (debug) { werror(do_indent(sprintf("node_classes: %O\n", node_classes), indent)); } string tpos = rule_set[0]->tpos; // string label; // int any_cdr_last; int last_was_if = 0; if (sizeof(node_classes[NULL_CAR]) || sizeof(node_classes[MATCH_CAR]) || sizeof(node_classes[NOT_NULL_CAR])) { res += indent + sprintf("if (!CA%sR(n)) {\n", tpos); if (sizeof(node_classes[NULL_CAR])) { zap_car([array(object(node))]node_classes[NULL_CAR]); #if 0 if (sizeof(node_classes[ANY_CAR]) < sizeof(node_classes[ANY_CDR])) { #endif /* 0 */ res += generate_match([array(object(node))] node_classes[NULL_CAR] + node_classes[ANY_CAR], indent + " "); #if 0 } else { res += generate_match(node_classes[NULL_CAR], indent + " "); if (sizeof(node_classes[ANY_CAR])) { label = sprintf("any_car_%d", label_cnt++); res += indent + " goto " + label + ";\n"; } } #endif /* 0 */ } res += indent + "}"; last_was_if = 1; } if (sizeof(node_classes[EXACT_CAR])) { if (last_was_if) { res += " else "; } else { res += indent; } res += "{\n"; indent += " "; last_was_if = 0; mapping(string:array(object(node))) exacts = ([]); foreach(node_classes[EXACT_CAR], object(node) n) { exacts[n->car] += ({ n }); } zap_car(node_classes[EXACT_CAR]); foreach(indices(exacts), string expr) { if (last_was_if) { res += " else "; } else { res += indent; } res += sprintf("if (CA%sR(n) == %s) {\n", tpos, expr); res += generate_match(exacts[expr], indent + " "); res += indent + "}"; } res += "\n"; last_was_if = 0; } if (sizeof(node_classes[NULL_CDR]) || sizeof(node_classes[MATCH_CDR]) || sizeof(node_classes[NOT_NULL_CDR])) { if (last_was_if) { res += " else "; } else { res += indent; } res += sprintf("if (!CD%sR(n)) {\n", tpos); if (sizeof(node_classes[NULL_CDR])) { zap_cdr(node_classes[NULL_CDR]); #if 0 if (label) { #endif /* 0 */ res += generate_match(node_classes[NULL_CDR] + node_classes[ANY_CDR], indent + " "); #if 0 } else { // We can use goto to handle ANY_CDR. res += generate_match(node_classes[NULL_CDR], indent + " "); if (sizeof(node_classes[ANY_CDR])) { label = sprintf("any_cdr_%d", label_cnt++); res += indent + " goto " + label + ";\n"; any_cdr_last = 1; } } #endif /* 0 */ } res += indent + "}"; last_was_if = 1; } if (sizeof(node_classes[EXACT_CDR])) { if (last_was_if) { res += " else "; } else { res += indent; } res += "{\n"; indent += " "; last_was_if = 0; mapping(string:array(object(node))) exacts = ([]); foreach(node_classes[EXACT_CDR], object(node) n) { exacts[n->cdr] += ({ n }); } zap_cdr(node_classes[EXACT_CDR]); foreach(sort(indices(exacts)), string expr) { if (last_was_if) { res += " else "; } else { res += indent; } res += sprintf("if (CD%sR(n) == %s) {\n", tpos, expr); res += generate_match(exacts[expr], indent + " "); res += indent + "}"; } res += "\n"; last_was_if = 0; } if (sizeof(node_classes[MATCH_CAR]) || sizeof(node_classes[NOT_NULL_CAR]) || sizeof(node_classes[MATCH_CDR]) || sizeof(node_classes[NOT_NULL_CDR])) { if (last_was_if) { res += " else {\n"; } else { res += indent + "{\n"; } if (sizeof(node_classes[MATCH_CAR])) { mapping(string:array(object(node))) token_groups = ([]); foreach(node_classes[MATCH_CAR], object(node) n) { token_groups[n->car->token] += ({ n->car }); } zap_car(node_classes[MATCH_CAR]); int last_was_if2; foreach(sort(indices(token_groups)), string token) { if (last_was_if2) { res += " else "; } else { res += indent + " "; } last_was_if2 = 1; res += sprintf("if (CA%sR(n)->token == %s) {\n", tpos, token); res += generate_extras_match(token_groups[token], indent + " "); res += indent + " }"; } res += "\n"; } if (sizeof(node_classes[MATCH_CDR])) { mapping(string:array(object(node))) token_groups = ([]); foreach(node_classes[MATCH_CDR], object(node) n) { token_groups[n->cdr->token] += ({ n->cdr }); } zap_cdr(node_classes[MATCH_CDR]); int last_was_if2; foreach(sort(indices(token_groups)), string token) { if (last_was_if2) { res += " else "; } else { res += indent + " "; } last_was_if2 = 1; res += sprintf("if (CD%sR(n)->token == %s) {\n", tpos, token); res += generate_extras_match(token_groups[token], indent + " "); res += indent + " }"; } res += "\n"; } array(object(node)) not_null = ({}); if (sizeof(node_classes[NOT_NULL_CAR])) { foreach(node_classes[NOT_NULL_CAR], object(node) n) { not_null += ({ n->car }); n->car = 0; } } if (sizeof(node_classes[NOT_NULL_CDR])) { foreach(node_classes[NOT_NULL_CDR], object(node) n) { not_null += ({ n->cdr }); n->cdr = 0; } } if (sizeof(not_null)) { res += generate_extras_match(not_null, indent + " "); } res += indent + "}"; last_was_if = 1; } if (last_was_if) { res += "\n"; } if (sizeof(node_classes[EXACT_CDR])) { indent = indent[2..]; res += indent + "}\n"; } if (sizeof(node_classes[EXACT_CAR])) { indent = indent[2..]; res += indent + "}\n"; } if (sizeof(node_classes[ANY])) { array(object(node)) parent_set = ({}); array(object(node)) car_set = ({}); array(object(node)) cdr_set = ({}); foreach(node_classes[ANY], object(node) n) { if (n->car) { car_set += ({ n->car }); n->car = 0; } else if (n->cdr) { cdr_set += ({ n->cdr }); n->cdr = 0; } else if (n->parent) { parent_set += ({ n->parent }); } else { res += do_indent(n->action, indent) + "\n"; n->action = 0; } } if (sizeof(car_set) || sizeof(cdr_set)) { res += generate_extras_match(car_set + cdr_set, indent); } if (sizeof(parent_set)) { res += generate_match(parent_set, indent); } } // werror(res + "\n"); return res; } string generate_extras_match(array(object(node)) rule_set, string indent) { string res = ""; mapping(string:array(object(node))) extra_set = ([]); array(object(node)) no_extras = ({}); foreach(rule_set, object(node) n) { if (n->extras && sizeof(n->extras)) { extra_set[n->extras * (") &&\n" + indent + " (")] += ({ n }); continue; } no_extras += ({ n }); } if (debug) { werror(do_indent(sprintf("extra_set: %O\n", extra_set), indent)); } if (sizeof(no_extras)) { res += generate_match(no_extras, indent); } foreach(sort(indices(extra_set)), string code) { res += indent + sprintf("if ((%s)) {\n", code); res += generate_match(extra_set[code], indent + " "); res += indent + "}\n"; } return res; } string generate_code() { string res = ""; // Note: token below can't be 0 or *. foreach(sort(indices(rules)), string token) { // debug = (token == "'?'"); res += "case " + token + ":\n" + generate_extras_match(rules[token], " ") + " break;\n\n"; } return res; } void generate_parent(object(node) n, object(node) parent, string tpos) { n->tpos = tpos; n->parent = parent; if (objectp(n->car)) { generate_parent([object(node)]n->car, n, "A"+tpos); } if (objectp(n->cdr)) { generate_parent([object(node)]n->cdr, n, "D"+tpos); } } int main(int argc, array(string) argv) { if (argc < 2) { fail("Expected filename\n"); } fname = argv[1]; if (fname[sizeof(fname)-3..] != ".in") { fail("Filename %O doesn't end with \".in\"\n", fname); } data = Stdio.File(fname, "r")->read(); parse_data(); foreach(indices(rules), string rule) { array(object(node)) nodes = rules[rule]; foreach(nodes, object(node) n) { generate_parent(n , 0, ""); } } string result = sprintf(header, fname) + generate_code(); object(Stdio.File) dest = Stdio.File(); fname = fname[..sizeof(fname)-4] + ".h"; if ((!dest->open(fname, "wct")) || (dest->write(result) != sizeof(result))) { fail("Failed to write file %O\n", fname); } exit(0); }

pike.git/ bin/ mktreeopt.pike > 1b19b643765dd02991fc8aa72195cab868a9d544 [Annotate]