GNU/Liberty Basic Compiler Collection-开源

/*\ * LBPP - A GNU Compiler Compiler (GCC) Liberty Basic Frontend * Copyright (C) 2001 Anthony Liguori <ajl13@bellatlantic.net rel='nofollow' onclick='return false;'> * * LBPP 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 2 of the License, or * (at your option) any later version. * * LBPP 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA \*/ #include <string.h> #include <stdio.h> #include <assert.h rel='nofollow' onclick='return false;'> #include <ctype.h> #include "lbpp.h" void translate_label(FILE *f, int i) { fprintf(f, "label_%d:\n", i); fprintf(f, "setjmp(cxt->labels[%d].jmp);\n", i); fprintf(f, "if (setting_labels)\n" "{\n" " goto label_%d;\n" "}\n", i + 1); } void translate_assignment(FILE *f, char *ptr) { char *asgn = ptr; char *name = ptr; char *end = skip_symbol(ptr); int i = 0; if (!strncasecmp(name, LET_STR, end - name) && (strlen(LET_STR) == end - name)) { name = skip_space(end); } i = lookup_variable(name); if (i == -1) { i = add_variable(name); } asgn = skip_symbol(name); asgn = skip_space(asgn); asgn = skip_param(asgn); asgn = skip_space(asgn); assert(*asgn == '='); asgn = skip_space(++asgn); if (var_table[i].type == DOUBLE) { translate_variable(f, name); fprintf(f, " = "); translate_expr(f, asgn); asgn = skip_expr(asgn); fprintf(f, ";\n"); } else if (var_table[i].type == STRING) { fprintf(f, "lbstr_set(&("); translate_variable(f, name); fprintf(f, "),"); translate_string(f, asgn); asgn = skip_string(asgn); fprintf(f, ");\n"); } else { fprintf(f, "Unknown lvalue type: %s\n", ptr); } asgn = skip_space(asgn); if (*asgn == ':') { translate_line(f, asgn + 1); } } int match_statement(char *buf, Statement *stmt) { char *ptr = buf; char *end = skip_symbol(ptr); int i; if (!strncasecmp(ptr, stmt->name, (end - ptr)) && (strlen(stmt->name) == (end - ptr))) { ptr = skip_space(end); for (i = 0; *ptr && i < stmt->arg_size; i++) { if (stmt->arg[i].literal) { end = ptr + strlen(stmt->arg[i].arg.string); if (strncasecmp(ptr, stmt->arg[i].arg.string, end - ptr) || strlen(stmt->arg[i].arg.string) != end - ptr) { break; } ptr = end; } else { if (stmt->arg[i].arg.type != VAR_ARG && stmt->arg[i].reference) { ptr = skip_symbol(ptr); ptr = skip_space(ptr); ptr = skip_param(ptr); } else { switch (stmt->arg[i].arg.type) { case STRING: ptr = skip_string(ptr); break; case DOUBLE: ptr = skip_expr(ptr); break; case HANDLE: if (*ptr == '#') { ptr = skip_symbol(++ptr); } break; case KEYWORD: ptr = skip_symbol(ptr); break; case LABEL: if (*ptr == '[') { ptr = strchr(ptr, ']') + 1; } break; case VAR_ARG: ptr = skip_vararg(ptr); break; default: break; } } } ptr = skip_space(ptr); } if (i == stmt->arg_size) { ptr = skip_space(ptr); if (!*ptr || *ptr == '\'' || *ptr == ':') { stmt->dirty = 1; return 1; } } } return 0; } void translate_vararg(FILE *f, char *buf) { char *ptr = buf; Type type = UNKNOWN; peek_expr(ptr, &type); if (type == STRING) { fprintf(f, "lb_va_adds("); translate_string(f, ptr); ptr = skip_string(ptr); } else if (type == DOUBLE) { fprintf(f, "lb_va_addd("); translate_expr(f, ptr); ptr = skip_expr(ptr); } else { fprintf(f, "lb_va_end(VA_END_SOFT)"); return; } ptr = skip_space(ptr); if (*ptr == ';') { fprintf(f, ", "); translate_vararg(f, skip_space(++ptr)); fprintf(f, ")"); } else { fprintf(f, ", lb_va_end(VA_END_HARD))"); } } void translate_vararg_ref(FILE *f, char *buf) { char *ptr = buf; int i = lookup_variable(buf); if (i == -1) { i = add_variable(buf); } fprintf(f, "lb_va_addv(&(cxt->vars[%d]), ", i); ptr = skip_symbol(ptr); ptr = skip_space(ptr); if (*ptr == ',') { translate_vararg_ref(f, skip_space(++ptr)); } else { fprintf(f, "lb_va_end(VA_END_SOFT)"); } fprintf(f, ")"); } void translate_statement(FILE *f, char *buf) { char *ptr = buf; int i; for (i = 0; i < statement_table_size; i++) { if (match_statement(ptr, &statement_table[i])) { break; } } if (i == statement_table_size) { char *end = skip_symbol(ptr); if (!strncasecmp(ptr, "IF", 2) && ((end - ptr) == 2)) { ptr = skip_space(ptr + 2); end = skip_bool(ptr); fprintf(f, "if ("); translate_bool(f, ptr); fprintf(f, ")\n{\n"); ptr = skip_space(end); end = skip_symbol(ptr); assert(!strncasecmp(ptr, "THEN", 4) && ((end - ptr) == 4)); ptr = skip_space(end); if (*ptr) { translate_line(f, ptr); fprintf(f, "}\n"); } } else if (!strncasecmp(ptr, "WHILE", 5) && ((end - ptr) == 5)) { ptr = skip_space(ptr + 5); end = skip_bool(ptr); fprintf(f, "while ("); translate_bool(f, ptr); fprintf(f, ")\n{\n"); ptr = skip_space(end); } else { fprintf(f, "#error %s\n", ptr); } } else { if (!strcasecmp(statement_table[i].name, "GOTO")) { char *label = skip_symbol(ptr); int j = 0; label = skip_space(label); j = lookup_label(label); if (j == -1) { j = add_label(label); } fprintf(f, "longjmp(cxt->labels[%d].jmp, 1);\n", j); ptr = skip_space(skip_symbol(label + 1) + 1); } else if (!strcasecmp(statement_table[i].name, "GOSUB")) { char *label = skip_symbol(ptr); int j = 0; label = skip_space(label); j = lookup_label(label); if (j == -1) { j = add_label(label); } fprintf(f, "if (setjmp(tmp_jmp) == 0) {\n"); fprintf(f, " lb_push_label(cxt, &tmp_jmp);\n"); fprintf(f, " longjmp(cxt->labels[%d].jmp, 1);\n}\n", j); ptr = skip_space(skip_symbol(label + 1) + 1); } else if (!strcasecmp(statement_table[i].name, "RETURN")) { fprintf(f, "lb_pop_label(cxt, &tmp_jmp);\n"); fprintf(f, "longjmp(tmp_jmp, 1);\n"); ptr = skip_space(skip_symbol(ptr)); } else if (!strcasecmp(statement_table[i].name, "FOR")) { char *lvalue; char *double1; char *double2; char *double3 = "1"; // This formula needs to be simplified! Big time... // FOR <lvalue> = <double> TO <double> [STEP <double>] // for (%1 = %2; // %1 != (double)((int)((%3 - %2) / %4)) * %4 + %4 + %2; // %1 += %4) lvalue = ptr = skip_space(skip_symbol(ptr)); ptr = skip_space(skip_param(skip_space(skip_symbol(ptr)))); ptr = skip_space(++ptr); double1 = ptr; ptr = skip_space(skip_expr(ptr)); ptr = skip_space(skip_symbol(ptr)); double2 = ptr; ptr = skip_space(skip_expr(ptr)); if (statement_table[i].arg_size == 7) { ptr = skip_space(skip_symbol(ptr)); double3 = ptr; } fprintf(f, "for ("); translate_variable(f, lvalue); fprintf(f, " = "); translate_expr(f, double1); fprintf(f, "; "); translate_variable(f, lvalue); fprintf(f, " != (double)((int)(("); translate_expr(f, double2); fprintf(f, " - "); translate_expr(f, double1); fprintf(f, ") / "); transla