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/* Parser for GNU CHILL (CCITT High-Level Language) -*- C -*- Copyright 1992, 1993, 1995, 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of GDB. This program 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. This program 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. */ /* Parse a Chill expression from text in a string, and return the result as a struct expression pointer. That structure contains arithmetic operations in reverse polish, with constants represented by operations that are followed by special data. See expression.h for the details of the format. What is important here is that it can be built up sequentially during the process of parsing; the lower levels of the tree always come first in the result. Note that the language accepted by this parser is more liberal than the one accepted by an actual Chill compiler. For example, the language rule that a simple name string can not be one of the reserved simple name strings is not enforced (e.g "case" is not treated as a reserved name). Another example is that Chill is a strongly typed language, and certain expressions that violate the type constraints may still be evaluated if gdb can do so in a meaningful manner, while such expressions would be rejected by the compiler. The reason for this more liberal behavior is the philosophy that the debugger is intended to be a tool that is used by the programmer when things go wrong, and as such, it should provide as few artificial barriers to it's use as possible. If it can do something meaningful, even something that violates language contraints that are enforced by the compiler, it should do so without complaint. */ #include "defs.h" #include "gdb_string.h" #include <ctype.h> #include "expression.h" #include "language.h" #include "value.h" #include "parser-defs.h" #include "ch-lang.h" #include "bfd.h" /* Required by objfiles.h. */ #include "symfile.h" /* Required by objfiles.h. */ #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */ #ifdef __GNUC__ #define INLINE __inline__ #endif typedef union { LONGEST lval; ULONGEST ulval; struct { LONGEST val; struct type *type; } typed_val; double dval; struct symbol *sym; struct type *tval; struct stoken sval; struct ttype tsym; struct symtoken ssym; } YYSTYPE; enum ch_terminal { END_TOKEN = 0, /* '\001' ... '\xff' come first. */ OPEN_PAREN = '(', TOKEN_NOT_READ = 999, INTEGER_LITERAL, BOOLEAN_LITERAL, CHARACTER_LITERAL, FLOAT_LITERAL, GENERAL_PROCEDURE_NAME, LOCATION_NAME, EMPTINESS_LITERAL, CHARACTER_STRING_LITERAL, BIT_STRING_LITERAL, TYPENAME, DOT_FIELD_NAME, /* '.' followed by <field name> */ CASE, OF, ESAC, LOGIOR, ORIF, LOGXOR, LOGAND, ANDIF, NOTEQUAL, GEQ, LEQ, IN, SLASH_SLASH, MOD, REM, NOT, POINTER, RECEIVE, UP, IF, THEN, ELSE, FI, ELSIF, ILLEGAL_TOKEN, NUM, PRED, SUCC, ABS, CARD, MAX_TOKEN, MIN_TOKEN, ADDR_TOKEN, SIZE, UPPER, LOWER, LENGTH, ARRAY, GDB_VARIABLE, GDB_ASSIGNMENT }; /* Forward declarations. */ static void write_lower_upper_value (enum exp_opcode, struct type *); static enum ch_terminal match_bitstring_literal (void); static enum ch_terminal match_integer_literal (void); static enum ch_terminal match_character_literal (void); static enum ch_terminal match_string_literal (void); static enum ch_terminal match_float_literal (void); static int decode_integer_literal (LONGEST *, char **); static int decode_integer_value (int, char **, LONGEST *); static char *match_simple_name_string (void); static void growbuf_by_size (int); static void parse_case_label (void); static void parse_untyped_expr (void); static void parse_if_expression (void); static void parse_if_expression_body (void); static void parse_else_alternative (void); static void parse_then_alternative (void); static void parse_expr (void); static void parse_operand0 (void); static void parse_operand1 (void); static void parse_operand2 (void); static void parse_operand3 (void); static void parse_operand4 (void); static void parse_operand5 (void); static void parse_operand6 (void); static void parse_primval (void); static void parse_tuple (struct type *); static void parse_opt_element_list (struct type *); static void parse_tuple_element (struct type *); static void parse_named_record_element (void); static void parse_call (void); static struct type *parse_mode_or_normal_call (void); #if 0 static struct type *parse_mode_call (void); #endif static void parse_unary_call (void); static int parse_opt_untyped_expr (void); static int expect (enum ch_terminal, char *); static enum ch_terminal ch_lex (void); INLINE static enum ch_terminal PEEK_TOKEN (void); static enum ch_terminal peek_token_ (int); static void forward_token_ (void); static void require (enum ch_terminal); static int check_token (enum ch_terminal); #define MAX_LOOK_AHEAD 2 static enum ch_terminal terminal_buffer[MAX_LOOK_AHEAD + 1] = { TOKEN_NOT_READ, TOKEN_NOT_READ, TOKEN_NOT_READ}; static YYSTYPE yylval; static YYSTYPE val_buffer[MAX_LOOK_AHEAD + 1]; /*int current_token, lookahead_token; */ INLINE static enum ch_terminal PEEK_TOKEN (void) { if (terminal_buffer[0] == TOKEN_NOT_READ) { terminal_buffer[0] = ch_lex (); val_buffer[0] = yylval; } return terminal_buffer[0]; } #define PEEK_LVAL() val_buffer[0] #define PEEK_TOKEN1() peek_token_(1) #define PEEK_TOKEN2() peek_token_(2) static enum ch_terminal peek_token_ (int i) { if (i > MAX_LOOK_AHEAD) internal_error (__FILE__, __LINE__, "too much lookahead"); if (terminal_buffer[i] == TOKEN_NOT_READ) { terminal_buffer[i] = ch_lex (); val_buffer[i] = yylval; } return terminal_buffer[i]; } #if 0 static void pushback_token (enum ch_terminal code, YYSTYPE node) { int i; if (terminal_buffer[MAX_LOOK_AHEAD] != TOKEN_NOT_READ) internal_error (__FILE__, __LINE__, "cannot pushback token"); for (i = MAX_LOOK_AHEAD; i > 0; i--) { terminal_buffer[i] = terminal_buffer[i - 1]; val_buffer[i] = val_buffer[i - 1]; } terminal_buffer[0] = code; val_buffer[0] = node; } #endif static void forward_token_ (void) { int i; for (i = 0; i < MAX_LOOK_AHEAD; i++) { terminal_buffer[i] = terminal_buffer[i + 1]; val_buffer[i] = val_buffer[i + 1]; } terminal_buffer[MAX_LOOK_AHEAD] = TOKEN_NOT_READ; } #define FORWARD_TOKEN() forward_token_() /* Skip the next token. if it isn't TOKEN, the parser is broken. */ static void require (enum ch_terminal token) { if (PEEK_TOKEN () != token) { internal_error (__FILE__, __LINE__, "expected token %d", (int) token); } FORWARD_TOKEN (); } static int check_token (enum ch_terminal token) { if (PEEK_TOKEN () != token) return 0; FORWARD_TOKEN (); return 1; } /* return 0 if expected token was not found, else return 1. */ static int expect (enum ch_terminal token, char *message) { if (PEEK_TOKEN () != token) { if (message) error (message); else if (token < 256) error ("syntax error - expected a '%c' here \"%s\"", token, lexptr); else error ("syntax error"); return 0; } else FORWARD_TOKEN (); return 1; } #if 0 /* Parse a name string. If ALLOW_ALL is 1, ALL is allowed as a postfix. */ static tree parse_opt_name_string (int allow_all) { int token = PEEK_TOKEN (); tree name; if (token != NAME) { if (token == ALL && allow_all) { FORWARD_TOKEN (); return ALL_POSTFIX; } return NULL_TREE; } name = PEEK_LVAL (); for (;;) { FORWARD_TOKEN (); token = PEEK_TOKEN (); if (token != '!') return name; FORWARD_TOKEN (); token = PEEK_TOKEN (); if (token == ALL && allow_all) return get_identifier3 (IDENTIFIER_POINTER (name), "!", "*"); if (token != NAME) { if (pass == 1) error ("'%s!' is not followed by an identifier", IDENTIFIER_POINTER (name)); return name; } name = get_identifier3 (IDENTIFIER_POINTER (name), "!", IDENTIFIER_POINTER (PEEK_LVAL ())); } } static tree parse_simple_name_string (void) { int token = PEEK_TOKEN (); tree name; if (token != NAME) { error ("expected a name here"); return error_mark_node; } name = PEEK_LVAL (); FORWARD_TOKEN (); return name; } static tree parse_name_string (void) { tree name = parse_opt_name_string (0); if (name) return name; if (pass == 1) error ("expected a name string here"); return error_mark_node; } /* Matches: <name_string> Returns if pass 1: the identifier. Returns if pass 2: a decl or value for identifier. */ static tree parse_name (void) { tree name = parse_name_string (); if (pass == 1 || ignoring) return name; else { tree decl = lookup_name (name); if (decl == NULL_TREE) { error ("`%s' undeclared", IDENTIFIER_POINTER (name)); return error_mark_node; } else if (TREE_CODE (TREE_TYPE (decl)) == ERROR_MARK) return error_mark_node; else if (TREE_CODE (decl) == CONST_DECL) return DECL_INITIAL (decl); else if (TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE) return convert_from_reference (decl); else return decl; } } #endif #if 0 static void pushback_paren_expr (tree expr) { if (pass == 1 && !ignoring) expr = build1 (PAREN_EXPR, NULL_TREE, expr); pushback_token (EXPR, expr); } #endif /* Matches: <case label> */ static void parse_case_label (void) { if (check_token (ELSE)) error ("ELSE in tuples labels not implemented"); /* Does not handle the case of a mode name. FIXME */ parse_expr (); if (check_token (':')) { parse_expr (); write_exp_elt_opcode (BINOP_RANGE); } } static int parse_opt_untyped_expr (void) { switch (PEEK_TOKEN ()) { case ',': case ':': case ')': return 0; default: parse_untyped_expr (); return 1; } } static void parse_unary_call (void) { FORWARD_TOKEN (); expect ('(', NULL); parse_expr (); expect (')', NULL); } /* Parse NAME '(' MODENAME ')'. */ #if 0 static struct type * parse_mode_call (void) { struct type *type; FORWARD_TOKEN (); expect ('(', NULL); if (PEEK_TOKEN () != TYPENAME) error ("expect MODENAME here `%s'", lexptr); type = PEEK_LVAL ().tsym.type; FORWARD_TOKEN (); expect (')', NULL); return type; } #endif static struct type * parse_mode_or_normal_call (void) { struct type *type; FORWARD_TOKEN (); expect ('(', NULL); if (PEEK_TOKEN () == TYPENAME) { type = PEEK_LVAL ().tsym.type; FORWARD_TOKEN (); } else { parse_expr (); type = NULL; } expect (')', NULL); return type; } /* Parse something that looks like a function call. Assume we have parsed the function, and are at the '('. */ static void parse_call (void) { int arg_count; require ('('); /* This is to save the value of arglist_len being accumulated for each dimension. */ start_arglist (); if (parse_opt_untyped_expr ()) { int tok = PEEK_TOKEN (); arglist_len = 1; if (tok == UP || tok == ':') { FORWARD_TOKEN (); parse_expr (); expect (')', "expected ')' to terminate slice"); end_arglist (); write_exp_elt_opcode (tok == UP ? TERNOP_SLICE_COUNT : TERNOP_SLICE); return; } while (check_token (',')) { parse_untyped_expr (); arglist_len++; } } else arglist_len = 0; expect (')', NULL); arg_count = end_arglist (); write_exp_elt_opcode (MULTI_SUBSCRIPT); write_exp_elt_longcst (arg_count); write_exp_elt_opcode (MULTI_SUBSCRIPT); } static void parse_named_record_element (void) { struct stoken label; char buf[256]; label = PEEK_LVAL ().sval; sprintf (buf, "expected a field name here `%s'", lexptr); expect (DOT_FIELD_NAME, buf); if (check_token (',')) parse_named_record_element (); else if (check_token (':')) parse_expr (); else error ("syntax error near `%s' in named record tuple element", lexptr); write_exp_elt_opcode (OP_LABELED); write_exp_string (label); write_exp_elt_opcode (OP_LABELED); } /* Returns one or more TREE_LIST nodes, in reverse order. */ static void parse_tuple_element (struct type *type) { if (PEEK_TOKEN () == DOT_FIELD_NAME) { /* Parse a labelled structure tuple. */ parse_named_record_element (); return; } if (check_token ('(')) { if (check_token ('*')) { expect (')', "missing ')' after '*' case label list"); if (type) { if (TYPE_CODE (type) == TYPE_CODE_ARRAY) { /* do this as a range from low to high */ struct type *range_type = TYPE_FIELD_TYPE (type, 0); LONGEST low_bound, high_bound; if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0) error ("cannot determine bounds for (*)"); /* lower bound */ write_exp_elt_opcode (OP_LONG); write_exp_elt_type (range_type); write_exp_elt_longcst (low_bound); write_exp_elt_opcode (OP_LONG); /* upper bound */ write_exp_elt_opcode (OP_LONG); write_exp_elt_type (range_type); write_exp_elt_longcst (high_bound); write_exp_elt_opcode (OP_LONG); write_exp_elt_opcode (BINOP_RANGE); } else error ("(*) in invalid context"); } else error ("(*) only possible with modename in front of tuple (mode[..])"); } else { parse_case_label (); while (check_token (',')) { parse_case_label (); write_exp_elt_opcode (BINOP_COMMA); } expect (')', NULL); } } else parse_untyped_expr (); if (check_token (':')) { /* A powerset range or a labeled Array. */ parse_untyped_expr (); write_exp_elt_opcode (BINOP_RANGE); } } /* Matches: a COMMA-separated list of tuple elements. Returns a list (of TREE_LIST nodes). */ static void parse_opt_element_list (struct type *type) { arglist_len = 0; if (PEEK_TOKEN () == ']') return; for (;;) { parse_tuple_element (type); arglist_len++; if (PEEK_TOKEN () == ']') break; if (!check_token (',')) error ("bad syntax in tuple"); } } /* Parses: '[' elements ']' If modename is non-NULL it prefixed the tuple. */ static void parse_tuple (struct type *mode) { struct type *type; if (mode) type = check_typedef (mode); else type = 0; require ('['); start_arglist (); parse_opt_element_list (type); expect (']', "missing ']' after tuple"); write_exp_elt_opcode (OP_ARRAY); write_exp_elt_longcst ((LONGEST) 0); write_exp_elt_longcst ((LONGEST) end_arglist () - 1); write_exp_elt_opcode (OP_ARRAY); if (type) { if (TYPE_CODE (type) != TYPE_CODE_ARRAY && TYPE_CODE (type) != TYPE_CODE_STRUCT && TYPE_CODE (type) != TYPE_CODE_SET) error ("invalid tuple mode"); write_exp_elt_opcode (UNOP_CAST); write_exp_elt_type (mode); write_exp_elt_opcode (UNOP_CAST); } } static void parse_primval (void) { struct type *type; enum exp_opcode op; char *op_name; switch (PEEK_TOKEN ()) { case INTEGER_LITERAL: case CHARACTER_LITERAL: write_exp_elt_opcode (OP_LONG); write_exp_elt_type (PEEK_LVAL ().typed_val.type); write_exp_elt_longcst (PEEK_LVAL ().typed_val.val); write_exp_elt_opcode (OP_LONG); FORWARD_TOKEN (); break; case BOOLEAN_LITERAL: write_exp_elt_opcode (OP_BOOL); write_exp_elt_longcst ((LONGEST) PEEK_LVAL ().ulval); write_exp_elt_opcode (OP_BOOL); FORWARD_TOKEN (); break; case FLOAT_LITERAL: write_exp_elt_opcode (OP_DOUBLE); write_exp_elt_type (builtin_type_double); write_exp_elt_dblcst (PEEK_LVAL ().dval); write_exp_elt_opcode (OP_DOUBLE); FORWARD_TOKEN (); break; case EMPTINESS_LITERAL: write_exp_elt_opcode (OP_LONG); write_exp_elt_type (lookup_pointer_type (builtin_type_void)); write_exp_elt_longcst (0); write_exp_elt_opcode (OP_LONG); FORWARD_TOKEN (); break; case CHARACTER_STRING_LITERAL: write_exp_elt_opcode (OP_STRING); write_exp_string (PEEK_LVAL ().sval); write_exp_elt_opcode (OP_STRING); FORWARD_TOKEN (); break; case BIT_STRING_LITERAL: write_exp_elt_opcode (OP_BITSTRING); write_exp_bitstring (PEEK_LVAL ().sval); write_exp_elt_opcode (OP_BITSTRING); FORWARD_TOKEN (); break; case ARRAY: FORWARD_TOKEN (); /* This is pseudo-Chill, similar to C's '(TYPE[])EXPR' which casts to an artificial array. */ expect ('(', NULL); expect (')', NULL); if (PEEK_TOKEN () != TYPENAME) error ("missing MODENAME after ARRAY()"); type = PEEK_LVAL ().tsym.type; FORWARD_TOKEN (); expect ('(', NULL); parse_expr (); expect (')', "missing right parenthesis"); type = create_array_type ((struct type *) NULL, type, create_range_type ((struct type *) NULL, builtin_type_int, 0, 0)); TYPE_ARRAY_UPPER_BOUND_TYPE (type) = BOUND_CANNOT_BE_DETERMINED; write_exp_elt_opcode (UNOP_CAST); write_exp_elt_type (type); write_exp_elt_opcode (UNOP_CAST); break; #if 0 case CONST: case EXPR: val = PEEK_LVAL (); FORWARD_TOKEN (); break; #endif case '(': FORWARD_TOKEN (); parse_expr (); expect (')', "missing right parenthesis"); break; case '[': parse_tuple (NULL); break; case GENERAL_PROCEDURE_NAME: case LOCATION_NAME: write_exp_elt_opcode (OP_VAR_VALUE); write_exp_elt_block (NULL); write_exp_elt_sym (PEEK_LVAL ().ssym.sym); write_exp_elt_opcode (OP_VAR_VALUE); FORWARD_TOKEN (); break; case GDB_VARIABLE: /* gdb specific */ FORWARD_TOKEN (); break; case NUM: parse_unary_call (); write_exp_elt_opcode (UNOP_CAST); write_exp_elt_type (builtin_type_int); write_exp_elt_opcode (UNOP_CAST); break; case CARD: parse_unary_call (); write_exp_elt_opcode (UNOP_CARD); break; case MAX_TOKEN: parse_unary_call (); write_exp_elt_opcode (UNOP_CHMAX); break; case MIN_TOKEN: parse_unary_call (); write_exp_elt_opcode (UNOP_CHMIN); break; case PRED: op_name = "PRED"; goto unimplemented_unary_builtin; case SUCC: op_name = "SUCC"; goto unimplemented_unary_builtin; case ABS: op_name = "ABS"; goto unimplemented_unary_builtin; unimplemented_unary_builtin: parse_unary_call (); error ("not implemented: %s builtin function", op_name); break; case ADDR_TOKEN: parse_unary_call (); write_exp_elt_opcode (UNOP_ADDR); break; case SIZE: type = parse_mode_or_normal_call (); if (type) { write_exp_elt_opcode (OP_LONG); write_exp_elt_type (builtin_type_int); CHECK_TYPEDEF (type); write_exp_elt_longcst ((LONGEST) TYPE_LENGTH (type)); write_exp_elt_opcode (OP_LONG); } else write_exp_elt_opcode (UNOP_SIZEOF); break; case LOWER: op = UNOP_LOWER; goto lower_upper; case UPPER: op = UNOP_UPPER; goto lower_upper; lower_upper: type = parse_mode_or_normal_call (); write_lower_upper_value (op, type); break; case LENGTH: parse_unary_call (); write_exp_elt_opcode (UNOP_LENGTH); break; case TYPENAME: type = PEEK_LVAL ().tsym.type; FORWARD_TOKEN (); switch (PEEK_TOKEN ()) { case '[': parse_tuple (type); break; case '(': FORWARD_TOKEN (); parse_expr (); expect (')', "missing right parenthesis"); write_exp_elt_opcode (UNOP_CAST); write_exp_elt_type (type); write_exp_elt_opcode (UNOP_CAST); break; default: error ("typename in invalid context"); } break; default: error ("invalid expression syntax at `%s'", lexptr); } for (;;) { switch (PEEK_TOKEN ()) { case DOT_FIELD_NAME: write_exp_elt_opcode (STRUCTOP_STRUCT); write_exp_string (PEEK_LVAL ().sval); write_exp_elt_opcode (STRUCTOP_STRUCT); FORWARD_TOKEN (); continue; case POINTER: FORWARD_TOKEN (); if (PEEK_TOKEN () == TYPENAME) { type = PEEK_LVAL ().tsym.type; write_exp_elt_opcode (UNOP_CAST); write_exp_elt_type (lookup_pointer_type (type)); write_exp_elt_opcode (UNOP_CAST); FORWARD_TOKEN (); } write_exp_elt_opcode (UNOP_IND); continue; case OPEN_PAREN: parse_call (); continue; case CHARACTER_STRING_LITERAL: case CHARACTER_LITERAL: case BIT_STRING_LITERAL: /* Handle string repetition. (See comment in parse_operand5.) */ parse_primval (); write_exp_elt_opcode (MULTI_SUBSCRIPT); write_exp_elt_longcst (1); write_exp_elt_opcode (MULTI_SUBSCRIPT); continue; case END_TOKEN: case TOKEN_NOT_READ: case INTEGER_LITERAL: case BOOLEAN_LITERAL: case FLOAT_LITERAL: case GENERAL_PROCEDURE_NAME: case LOCATION_NAME: case EMPTINESS_LITERAL: case TYPENAME: case CASE: case OF: case ESAC: case LOGIOR: case ORIF: case LOGXOR: case LOGAND: case ANDIF: case NOTEQUAL: case GEQ: case LEQ: case IN: case SLASH_SLASH: case MOD: case REM: case NOT: case RECEIVE: case UP: case IF: case THEN: case ELSE: case FI: case ELSIF: case ILLEGAL_TOKEN: case NUM: case PRED: case SUCC: case ABS: case CARD: case MAX_TOKEN: case MIN_TOKEN: case ADDR_TOKEN: case SIZE: case UPPER: case LOWER: case LENGTH: case ARRAY: case GDB_VARIABLE: case GDB_ASSIGNMENT: break; } break; } return; } static void parse_operand6 (void) { if (check_token (RECEIVE)) { parse_primval (); error ("not implemented: RECEIVE expression"); } else if (check_token (POINTER)) { parse_primval (); write_exp_elt_opcode (UNOP_ADDR); } else parse_primval (); } static void parse_operand5 (void) { enum exp_opcode op; /* We are supposed to be looking for a <string repetition operator>, but in general we can't distinguish that from a parenthesized expression. This is especially difficult if we allow the string operand to be a constant expression (as requested by some users), and not just a string literal. Consider: LPRN expr RPRN LPRN expr RPRN Is that a function call or string repetition? Instead, we handle string repetition in parse_primval, and build_generalized_call. */ switch (PEEK_TOKEN ()) { case NOT: op = UNOP_LOGICAL_NOT; break; case '-': op = UNOP_NEG; break; default: op = OP_NULL; } if (op != OP_NULL) FORWARD_TOKEN (); parse_operand6 (); if (op != OP_NULL) write_exp_elt_opcode (op); } static void parse_operand4 (void) { enum exp_opcode op; parse_operand5 (); for (;;) { switch (PEEK_TOKEN ()) { case '*': op = BINOP_MUL; break; case '/': op = BINOP_DIV; break; case MOD: op = BINOP_MOD; break; case REM: op = BINOP_REM; break; default: return; } FORWARD_TOKEN (); parse_operand5 (); write_exp_elt_opcode (op); } } static void parse_operand3 (void) { enum exp_opcode op; parse_operand4 (); for (;;) { switch (PEEK_TOKEN ()) { case '+': op = BINOP_ADD; break; case '-': op = BINOP_SUB; break; case SLASH_SLASH: op = BINOP_CONCAT; break; default: return; } FORWARD_TOKEN (); parse_operand4 (); write_exp_elt_opcode (op); } } static void parse_operand2 (void) { enum exp_opcode op; parse_operand3 (); for (;;) { if (check_token (IN)) { parse_operand3 (); write_exp_elt_opcode (BINOP_IN); } else { switch (PEEK_TOKEN ()) { case '>': op = BINOP_GTR; break; case GEQ: op = BINOP_GEQ; break; case '<': op = BINOP_LESS; break; case LEQ: op = BINOP_LEQ; break; case '=': op = BINOP_EQUAL; break; case NOTEQUAL: op = BINOP_NOTEQUAL; break; default: return; } FORWARD_TOKEN (); parse_operand3 (); write_exp_elt_opcode (op); } } } static void parse_operand1 (void) { enum exp_opcode op; parse_operand2 (); for (;;) { switch (PEEK_TOKEN ()) { case LOGAND: op = BINOP_BITWISE_AND; break; case ANDIF: op = BINOP_LOGICAL_AND; break; default: return; } FORWARD_TOKEN (); parse_operand2 (); write_exp_elt_opcode (op); } } static void parse_operand0 (void) { enum exp_opcode op; parse_operand1 (); for (;;) { switch (PEEK_TOKEN ()) { case LOGIOR: op = BINOP_BITWISE_IOR; break; case LOGXOR: op = BINOP_BITWISE_XOR; break; case ORIF: op = BINOP_LOGICAL_OR; break; default: return; } FORWARD_TOKEN (); parse_operand1 (); write_exp_elt_opcode (op); } } static void parse_expr (void) { parse_operand0 (); if (check_token (GDB_ASSIGNMENT)) { parse_expr (); write_exp_elt_opcode (BINOP_ASSIGN); } } static void parse_then_alternative (void) { expect (THEN, "missing 'THEN' in 'IF' expression"); parse_expr (); } static void parse_else_alternative (void) { if (check_token (ELSIF)) parse_if_expression_body (); else if (check_token (ELSE)) parse_expr (); else error ("missing ELSE/ELSIF in IF expression"); } /* Matches: <boolean expression> <then alternative> <else alternative> */ static void parse_if_expression_body (void) { parse_expr (); parse_then_alternative (); parse_else_alternative (); write_exp_elt_opcode (TERNOP_COND); } static void parse_if_expression (void) { require (IF); parse_if_expression_body (); expect (FI, "missing 'FI' at end of conditional expression"); } /* An <untyped_expr> is a superset of <expr>. It also includes <conditional expressions> and untyped <tuples>, whose types are not given by their constituents. Hence, these are only allowed in certain contexts that expect a certain type. You should call convert() to fix up the <untyped_expr>. */ static void parse_untyped_expr (void) { switch (PEEK_TOKEN ()) { case IF: parse_if_expression (); return; case CASE: error ("not implemented: CASE expression"); case '(': switch (PEEK_TOKEN1 ()) { case IF: case CASE: goto skip_lprn; case '[': skip_lprn: FORWARD_TOKEN (); parse_untyped_expr (); expect (')', "missing ')'"); return; default:; /* fall through */ } default: parse_operand0 (); } } int chill_parse (void) { terminal_buffer[0] = TOKEN_NOT_READ; if (PEEK_TOKEN () == TYPENAME && PEEK_TOKEN1 () == END_TOKEN) { write_exp_elt_opcode (OP_TYPE); write_exp_elt_type (PEEK_LVAL ().tsym.type); write_exp_elt_opcode (OP_TYPE); FORWARD_TOKEN (); } else parse_expr (); if (terminal_buffer[0] != END_TOKEN) { if (comma_terminates && terminal_buffer[0] == ',') lexptr--; /* Put the comma back. */ else error ("Junk after end of expression."); } return 0; } /* Implementation of a dynamically expandable buffer for processing input characters acquired through lexptr and building a value to return in yylval. */ static char *tempbuf; /* Current buffer contents */ static int tempbufsize; /* Size of allocated buffer */ static int tempbufindex; /* Current index into buffer */ #define GROWBY_MIN_SIZE 64 /* Minimum amount to grow buffer by */ #define CHECKBUF(size) \ do { \ if (tempbufindex + (size) >= tempbufsize) \ { \ growbuf_by_size (size); \ } \ } while (0); /* Grow the static temp buffer if necessary, including allocating the first one on demand. */ static void growbuf_by_size (int count) { int growby; growby = max (count, GROWBY_MIN_SIZE); tempbufsize += growby; if (tempbuf == NULL) { tempbuf = (char *) xmalloc (tempbufsize); } else { tempbuf = (char *) xrealloc (tempbuf, tempbufsize); } } /* Try to consume a simple name string token. If successful, returns a pointer to a nullbyte terminated copy of the name that can be used in symbol table lookups. If not successful, returns NULL. */ static char * match_simple_name_string (void) { char *tokptr = lexptr; if (isalpha (*tokptr) || *tokptr == '_') { char *result; do { tokptr++; } while (isalnum (*tokptr) || (*tokptr == '_')); yylval.sval.ptr = lexptr; yylval.sval.length = tokptr - lexptr; lexptr = tokptr; result = copy_name (yylval.sval); return result; } return (NULL); } /* Start looking for a value composed of valid digits as set by the base in use. Note that '_' characters are valid anywhere, in any quantity, and are simply ignored. Since we must find at least one valid digit, or reject this token as an integer literal, we keep track of how many digits we have encountered. */ static int decode_integer_value (int base, char **tokptrptr, LONGEST *ivalptr) { char *tokptr = *tokptrptr; int temp; int digits = 0; while (*tokptr != '\0') { temp = *tokptr; if (isupper (temp)) temp = tolower (temp); tokptr++; switch (temp) { case '_': continue; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': temp -= '0'; break; case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': temp -= 'a'; temp += 10; break; default: temp = base; break; } if (temp < base) { digits++; *ivalptr *= base; *ivalptr += temp; } else { /* Found something not in domain for current base. */ tokptr--; /* Unconsume what gave us indigestion. */ break; } } /* If we didn't find any digits, then we don't have a valid integer value, so reject the entire token. Otherwise, update the lexical scan pointer, and return non-zero for success. */ if (digits == 0) { return (0); } else { *tokptrptr = tokptr; return (1); } } static int decode_integer_literal (LONGEST *valptr, char **tokptrptr) { char *tokptr = *tokptrptr; int base = 0; LONGEST ival = 0; int explicit_base = 0; /* Look for an explicit base specifier, which is optional. */ switch (*tokptr) { case 'd': case 'D': explicit_base++; base = 10; tokptr++; break; case 'b': case 'B': explicit_base++; base = 2; tokptr++; break; case 'h': case 'H': explicit_base++; base = 16; tokptr++; break; case 'o': case 'O': explicit_base++; base = 8; tokptr++; break; default: base = 10; break; } /* If we found an explicit base ensure that the character after the explicit base is a single quote. */ if (explicit_base && (*tokptr++ != '\'')) { return (0); } /* Attempt to decode whatever follows as an integer value in the indicated base, updating the token pointer in the process and computing the value into ival. Also, if we have an explicit base, then the next character must not be a single quote, or we have a bitstring literal, so reject the entire token in this case. Otherwise, update the lexical scan pointer, and return non-zero for success. */ if (!decode_integer_value (base, &tokptr, &ival)) { return (0); } else if (explicit_base && (*tokptr == '\'')) { return (0); } else { *valptr = ival; *tokptrptr = tokptr; return (1); } } /* If it wasn't for the fact that floating point values can contain '_' characters, we could just let strtod do all the hard work by letting it try to consume as much of the current token buffer as possible and find a legal conversion. Unfortunately we need to filter out the '_' characters before calling strtod, which we do by copying the other legal chars to a local buffer to be converted. However since we also need to keep track of where the last unconsumed character in the input buffer is, we have transfer only as many characters as may compose a legal floating point value. */ static enum ch_terminal match_float_literal (void) { char *tokptr = lexptr; char *buf; char *copy; double dval; extern double strtod (); /* Make local buffer in which to build the string to convert. This is required because underscores are valid in chill floating point numbers but not in the string passed to strtod to convert. The string will be no longer than our input string. */ copy = buf = (char *) alloca (strlen (tokptr) + 1); /* Transfer all leading digits to the conversion buffer, discarding any underscores. */ while (isdigit (*tokptr) || *tokptr == '_') { if (*tokptr != '_') { *copy++ = *tokptr; } tokptr++; } /* Now accept either a '.', or one of [eEdD]. Dot is legal regardless of whether we found any leading digits, and we simply accept it and continue on to look for the fractional part and/or exponent. One of [eEdD] is legal only if we have seen digits, and means that there is no fractional part. If we find neither of these, then this is not a floating point number, so return failure. */ switch (*tokptr++) { case '.': /* Accept and then look for fractional part and/or exponent. */ *copy++ = '.'; break; case 'e': case 'E': case 'd': case 'D': if (copy == buf) { return (0); } *copy++ = 'e'; goto collect_exponent; break; default: return (0); break; } /* We found a '.', copy any fractional digits to the conversion buffer, up to the first nondigit, non-underscore character. */ while (isdigit (*tokptr) || *tokptr == '_') { if (*tokptr != '_') { *copy++ = *tokptr; } tokptr++; } /* Look for an exponent, which must start with one of [eEdD]. If none is found, jump directly to trying to convert what we have collected so far. */ switch (*tokptr) { case 'e': case 'E': case 'd': case 'D': *copy++ = 'e'; tokptr++; break; default: goto convert_float; break; } /* Accept an optional '-' or '+' following one of [eEdD]. */ collect_exponent: if (*tokptr == '+' || *tokptr == '-') { *copy++ = *tokptr++; } /* Now copy an exponent into the conversion buffer. Note that at the moment underscores are *not* allowed in exponents. */ while (isdigit (*tokptr)) { *copy++ = *tokptr++; } /* If we transfered any chars to the conversion buffer, try to interpret its contents as a floating point value. If any characters remain, then we must not have a valid floating point string. */ convert_float: *copy = '\0'; if (copy != buf) { dval = strtod (buf, ©); if (*copy == '\0') { yylval.dval = dval; lexptr = tokptr; return (FLOAT_LITERAL); } } return (0); } /* Recognize a string literal. A string literal is a sequence of characters enclosed in matching single or double quotes, except that a single character inside single quotes is a character literal, which we reject as a string literal. To embed the terminator character inside a string, it is simply doubled (I.E. "this""is""one""string") */ static enum ch_terminal match_string_literal (void) { char *tokptr = lexptr; int in_ctrlseq = 0; LONGEST ival; for (tempbufindex = 0, tokptr++; *tokptr != '\0'; tokptr++) { CHECKBUF (1); tryagain:; if (in_ctrlseq) { /* skip possible whitespaces */ while ((*tokptr == ' ' || *tokptr == '\t') && *tokptr) tokptr++; if (*tokptr == ')') { in_ctrlseq = 0; tokptr++; goto tryagain; } else if (*tokptr != ',') error ("Invalid control sequence"); tokptr++; /* skip possible whitespaces */ while ((*tokptr == ' ' || *tokptr == '\t') && *tokptr) tokptr++; if (!decode_integer_literal (&ival, &tokptr)) error ("Invalid control sequence"); tokptr--; } else if (*tokptr == *lexptr) { if (*(tokptr + 1) == *lexptr) { ival = *tokptr++; } else { break; } } else if (*tokptr == '^') { if (*(tokptr + 1) == '(') { in_ctrlseq = 1; tokptr += 2; if (!decode_integer_literal (&ival, &tokptr)) error ("Invalid control sequence"); tokptr--; } else if (*(tokptr + 1) == '^') ival = *tokptr++; else error ("Invalid control sequence"); } else ival = *tokptr; tempbuf[tempbufindex++] = ival; } if (in_ctrlseq) error ("Invalid control sequence"); if (*tokptr == '\0' /* no terminator */ || (tempbufindex == 1 && *tokptr == '\'')) /* char literal */ { return (0); } else { tempbuf[tempbufindex] = '\0'; yylval.sval.ptr = tempbuf; yylval.sval.length = tempbufindex; lexptr = ++tokptr; return (CHARACTER_STRING_LITERAL); } } /* Recognize a character literal. A character literal is single character or a control sequence, enclosed in single quotes. A control sequence is a comma separated list of one or more integer literals, enclosed in parenthesis and introduced with a circumflex character. EX: 'a' '^(7)' '^(7,8)' As a GNU chill extension, the syntax C'xx' is also recognized as a character literal, where xx is a hex value for the character. Note that more than a single character, enclosed in single quotes, is a string literal. Returns CHARACTER_LITERAL if a match is found. */ static enum ch_terminal match_character_literal (void) { char *tokptr = lexptr; LONGEST ival = 0; if ((*tokptr == 'c' || *tokptr == 'C') && (*(tokptr + 1) == '\'')) { /* We have a GNU chill extension form, so skip the leading "C'", decode the hex value, and then ensure that we have a trailing single quote character. */ tokptr += 2; if (!decode_integer_value (16, &tokptr, &ival) || (*tokptr != '\'')) { return (0); } tokptr++; } else if (*tokptr == '\'') { tokptr++; /* Determine which form we have, either a control sequence or the single character form. */ if (*tokptr == '^') { if (*(tokptr + 1) == '(') { /* Match and decode a control sequence. Return zero if we don't find a valid integer literal, or if the next unconsumed character after the integer literal is not the trailing ')'. */ tokptr += 2; if (!decode_integer_literal (&ival, &tokptr) || (*tokptr++ != ')')) { return (0); } } else if (*(tokptr + 1) == '^') { ival = *tokptr; tokptr += 2; } else /* fail */ error ("Invalid control sequence"); } else if (*tokptr == '\'') { /* this must be duplicated */ ival = *tokptr; tokptr += 2; } else { ival = *tokptr++; } /* The trailing quote has not yet been consumed. If we don't find it, then we have no match. */ if (*tokptr++ != '\'') { return (0); } } else { /* Not a character literal. */ return (0); } yylval.typed_val.val = ival; yylval.typed_val.type = builtin_type_chill_char; lexptr = tokptr; return (CHARACTER_LITERAL); } /* Recognize an integer literal, as specified in Z.200 sec 5.2.4.2. Note that according to 5.2.4.2, a single "_" is also a valid integer literal, however GNU-chill requires there to be at least one "digit" in any integer literal. */ static enum ch_terminal match_integer_literal (void) { char *tokptr = lexptr; LONGEST ival; if (!decode_integer_literal (&ival, &tokptr)) { return (0); } else { yylval.typed_val.val = ival; #if defined(CC_HAS_LONG_LONG) if (ival > (LONGEST) 2147483647U || ival < -(LONGEST) 2147483648U) yylval.typed_val.type = builtin_type_long_long; else #endif yylval.typed_val.type = builtin_type_int; lexptr = tokptr; return (INTEGER_LITERAL); } } /* Recognize a bit-string literal, as specified in Z.200 sec 5.2.4.8 Note that according to 5.2.4.8, a single "_" is also a valid bit-string literal, however GNU-chill requires there to be at least one "digit" in any bit-string literal. */ static enum ch_terminal match_bitstring_literal (void) { register char *tokptr = lexptr; int bitoffset = 0; int bitcount = 0; int bits_per_char; int digit; tempbufindex = 0; CHECKBUF (1); tempbuf[0] = 0; /* Look for the required explicit base specifier. */ switch (*tokptr++) { case 'b': case 'B': bits_per_char = 1; break; case 'o': case 'O': bits_per_char = 3; break; case 'h': case 'H': bits_per_char = 4; break; default: return (0); break; } /* Ensure that the character after the explicit base is a single quote. */ if (*tokptr++ != '\'') { return (0); } while (*tokptr != '\0' && *tokptr != '\'') { digit = *tokptr; if (isupper (digit)) digit = tolower (digit); tokptr++; switch (digit) { case '_': continue; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': digit -= '0'; break; case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': digit -= 'a'; digit += 10; break; default: /* this is not a bitstring literal, probably an integer */ return 0; } if (digit >= 1 << bits_per_char) { /* Found something not in domain for current base. */ error ("Too-large digit in bitstring or integer."); } else { /* Extract bits from digit, packing them into the bitstring byte. */ int k = TARGET_BYTE_ORDER == BIG_ENDIAN ? bits_per_char - 1 : 0; for (; TARGET_BYTE_ORDER == BIG_ENDIAN ? k >= 0 : k < bits_per_char; TARGET_BYTE_ORDER == BIG_ENDIAN ? k-- : k++) { bitcount++; if (digit & (1 << k)) { tempbuf[tempbufindex] |= (TARGET_BYTE_ORDER == BIG_ENDIAN) ? (1 << (HOST_CHAR_BIT - 1 - bitoffset)) : (1 << bitoffset); } bitoffset++; if (bitoffset == HOST_CHAR_BIT) { bitoffset = 0; tempbufindex++; CHECKBUF (1); tempbuf[tempbufindex] = 0; } } } } /* Verify that we consumed everything up to the trailing single quote, and that we found some bits (IE not just underbars). */ if (*tokptr++ != '\'') { return (0); } else { yylval.sval.ptr = tempbuf; yylval.sval.length = bitcount; lexptr = tokptr; return (BIT_STRING_LITERAL); } } struct token { char *operator; int token; }; static const struct token idtokentab[] = { {"array", ARRAY}, {"length", LENGTH}, {"lower", LOWER}, {"upper", UPPER}, {"andif", ANDIF}, {"pred", PRED}, {"succ", SUCC}, {"card", CARD}, {"size", SIZE}, {"orif", ORIF}, {"num", NUM}, {"abs", ABS}, {"max", MAX_TOKEN}, {"min", MIN_TOKEN}, {"mod", MOD}, {"rem", REM}, {"not", NOT}, {"xor", LOGXOR}, {"and", LOGAND}, {"in", IN}, {"or", LOGIOR}, {"up", UP}, {"addr", ADDR_TOKEN}, {"null", EMPTINESS_LITERAL} }; static const struct token tokentab2[] = { {":=", GDB_ASSIGNMENT}, {"//", SLASH_SLASH}, {"->", POINTER}, {"/=", NOTEQUAL}, {"<=", LEQ}, {">=", GEQ} }; /* Read one token, getting characters through lexptr. */ /* This is where we will check to make sure that the language and the operators used are compatible. */ static enum ch_terminal ch_lex (void) { unsigned int i; enum ch_terminal token; char *inputname; struct symbol *sym; /* Skip over any leading whitespace. */ while (isspace (*lexptr)) { lexptr++; } /* Look for special single character cases which can't be the first character of some other multicharacter token. */ switch (*lexptr) { case '\0': return END_TOKEN; case ',': case '=': case ';': case '!': case '+': case '*': case '(': case ')': case '[': case ']': return (*lexptr++); } /* Look for characters which start a particular kind of multicharacter token, such as a character literal, register name, convenience variable name, string literal, etc. */ switch (*lexptr) { case '\'': case '\"': /* First try to match a string literal, which is any sequence of characters enclosed in matching single or double quotes, except that a single character inside single quotes is a character literal, so we have to catch that case also. */ token = match_string_literal (); if (token != 0) { return (token); } if (*lexptr == '\'') { token = match_character_literal (); if (token != 0) { return (token); } } break; case 'C': case 'c': token = match_character_literal (); if (token != 0) { return (token); } break; case '$': yylval.sval.ptr = lexptr; do { lexptr++; } while (isalnum (*lexptr) || *lexptr == '_' || *lexptr == '$'); yylval.sval.length = lexptr - yylval.sval.ptr; write_dollar_variable (yylval.sval); return GDB_VARIABLE; break; } /* See if it is a special token of length 2. */ for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++) { if (STREQN (lexptr, tokentab2[i].operator, 2)) { lexptr += 2; return (tokentab2[i].token); } } /* Look for single character cases which which could be the first character of some other multicharacter token, but aren't, or we would already have found it. */ switch (*lexptr) { case '-': case ':': case '/': case '<': case '>': return (*lexptr++); } /* Look for a float literal before looking for an integer literal, so we match as much of the input stream as possible. */ token = match_float_literal (); if (token != 0) { return (token); } token = match_bitstring_literal (); if (token != 0) { return (token); } token = match_integer_literal (); if (token != 0) { return (token); } /* Try to match a simple name string, and if a match is found, then further classify what sort of name it is and return an appropriate token. Note that attempting to match a simple name string consumes the token from lexptr, so we can't back out if we later find that we can't classify what sort of name it is. */ inputname = match_simple_name_string (); if (inputname != NULL) { char *simplename = (char *) alloca (strlen (inputname) + 1); char *dptr = simplename, *sptr = inputname; for (; *sptr; sptr++) *dptr++ = isupper (*sptr) ? tolower (*sptr) : *sptr; *dptr = '\0'; /* See if it is a reserved identifier. */ for (i = 0; i < sizeof (idtokentab) / sizeof (idtokentab[0]); i++) { if (STREQ (simplename, idtokentab[i].operator)) { return (idtokentab[i].token); } } /* Look for other special tokens. */ if (STREQ (simplename, "true")) { yylval.ulval = 1; return (BOOLEAN_LITERAL); } if (STREQ (simplename, "false")) { yylval.ulval = 0; return (BOOLEAN_LITERAL); } sym = lookup_symbol (inputname, expression_context_block, VAR_NAMESPACE, (int *) NULL, (struct symtab **) NULL); if (sym == NULL && strcmp (inputname, simplename) != 0) { sym = lookup_symbol (simplename, expression_context_block, VAR_NAMESPACE, (int *) NULL, (struct symtab **) NULL); } if (sym != NULL) { yylval.ssym.stoken.ptr = NULL; yylval.ssym.stoken.length = 0; yylval.ssym.sym = sym; yylval.ssym.is_a_field_of_this = 0; /* FIXME, C++'ism */ switch (SYMBOL_CLASS (sym)) { case LOC_BLOCK: /* Found a procedure name. */ return (GENERAL_PROCEDURE_NAME); case LOC_STATIC: /* Found a global or local static variable. */ return (LOCATION_NAME); case LOC_REGISTER: case LOC_ARG: case LOC_REF_ARG: case LOC_REGPARM: case LOC_REGPARM_ADDR: case LOC_LOCAL: case LOC_LOCAL_ARG: case LOC_BASEREG: case LOC_BASEREG_ARG: if (innermost_block == NULL || contained_in (block_found, innermost_block)) { innermost_block = block_found; } return (LOCATION_NAME); break; case LOC_CONST: case LOC_LABEL: return (LOCATION_NAME); break; case LOC_TYPEDEF: yylval.tsym.type = SYMBOL_TYPE (sym); return TYPENAME; case LOC_UNDEF: case LOC_CONST_BYTES: case LOC_OPTIMIZED_OUT: error ("Symbol \"%s\" names no location.", inputname); break; default: internal_error (__FILE__, __LINE__, "unhandled SYMBOL_CLASS in ch_lex()"); break; } } else if (!have_full_symbols () && !have_partial_symbols ()) { error ("No symbol table is loaded. Use the \"file\" command."); } else { error ("No symbol \"%s\" in current context.", inputname); } } /* Catch single character tokens which are not part of some longer token. */ switch (*lexptr) { case '.': /* Not float for example. */ lexptr++; while (isspace (*lexptr)) lexptr++; inputname = match_simple_name_string (); if (!inputname) return '.'; return DOT_FIELD_NAME; } return (ILLEGAL_TOKEN); } static void write_lower_upper_value (enum exp_opcode opcode, /* Either UNOP_LOWER or UNOP_UPPER */ struct type *type) { if (type == NULL) write_exp_elt_opcode (opcode); else { struct type *result_type; LONGEST val = type_lower_upper (opcode, type, &result_type); write_exp_elt_opcode (OP_LONG); write_exp_elt_type (result_type); write_exp_elt_longcst (val); write_exp_elt_opcode (OP_LONG); } } void chill_error (char *msg) { /* Never used. */ }