1648 lines
42 KiB
Plaintext
1648 lines
42 KiB
Plaintext
/* YACC parser for Go expressions, for GDB.
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Copyright (C) 2012-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This file is derived from c-exp.y, p-exp.y. */
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/* Parse a Go expression from text in a string,
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and return the result as a struct expression pointer.
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That structure contains arithmetic operations in reverse polish,
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with constants represented by operations that are followed by special data.
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See expression.h for the details of the format.
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What is important here is that it can be built up sequentially
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during the process of parsing; the lower levels of the tree always
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come first in the result.
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Note that malloc's and realloc's in this file are transformed to
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xmalloc and xrealloc respectively by the same sed command in the
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makefile that remaps any other malloc/realloc inserted by the parser
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generator. Doing this with #defines and trying to control the interaction
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with include files (<malloc.h> and <stdlib.h> for example) just became
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too messy, particularly when such includes can be inserted at random
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times by the parser generator. */
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/* Known bugs or limitations:
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- Unicode
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- &^
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- '_' (blank identifier)
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- automatic deref of pointers
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- method expressions
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- interfaces, channels, etc.
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And lots of other things.
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I'm sure there's some cleanup to do.
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*/
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%{
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#include "defs.h"
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#include <ctype.h>
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#include "expression.h"
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#include "value.h"
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#include "parser-defs.h"
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#include "language.h"
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#include "c-lang.h"
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#include "go-lang.h"
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#include "bfd.h" /* Required by objfiles.h. */
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#include "symfile.h" /* Required by objfiles.h. */
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#include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
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#include "charset.h"
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#include "block.h"
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#define parse_type(ps) builtin_type (parse_gdbarch (ps))
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/* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
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as well as gratuitiously global symbol names, so we can have multiple
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yacc generated parsers in gdb. Note that these are only the variables
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produced by yacc. If other parser generators (bison, byacc, etc) produce
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additional global names that conflict at link time, then those parser
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generators need to be fixed instead of adding those names to this list. */
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#define yymaxdepth go_maxdepth
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#define yyparse go_parse_internal
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#define yylex go_lex
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#define yyerror go_error
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#define yylval go_lval
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#define yychar go_char
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#define yydebug go_debug
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#define yypact go_pact
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#define yyr1 go_r1
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#define yyr2 go_r2
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#define yydef go_def
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#define yychk go_chk
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#define yypgo go_pgo
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#define yyact go_act
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#define yyexca go_exca
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#define yyerrflag go_errflag
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#define yynerrs go_nerrs
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#define yyps go_ps
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#define yypv go_pv
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#define yys go_s
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#define yy_yys go_yys
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#define yystate go_state
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#define yytmp go_tmp
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#define yyv go_v
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#define yy_yyv go_yyv
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#define yyval go_val
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#define yylloc go_lloc
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#define yyreds go_reds /* With YYDEBUG defined */
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#define yytoks go_toks /* With YYDEBUG defined */
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#define yyname go_name /* With YYDEBUG defined */
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#define yyrule go_rule /* With YYDEBUG defined */
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#define yylhs go_yylhs
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#define yylen go_yylen
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#define yydefred go_yydefred
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#define yydgoto go_yydgoto
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#define yysindex go_yysindex
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#define yyrindex go_yyrindex
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#define yygindex go_yygindex
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#define yytable go_yytable
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#define yycheck go_yycheck
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#ifndef YYDEBUG
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#define YYDEBUG 1 /* Default to yydebug support */
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#endif
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#define YYFPRINTF parser_fprintf
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/* The state of the parser, used internally when we are parsing the
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expression. */
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static struct parser_state *pstate = NULL;
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int yyparse (void);
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static int yylex (void);
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void yyerror (char *);
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%}
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/* Although the yacc "value" of an expression is not used,
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since the result is stored in the structure being created,
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other node types do have values. */
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%union
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{
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LONGEST lval;
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struct {
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LONGEST val;
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struct type *type;
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} typed_val_int;
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struct {
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DOUBLEST dval;
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struct type *type;
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} typed_val_float;
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struct stoken sval;
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struct symtoken ssym;
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struct type *tval;
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struct typed_stoken tsval;
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struct ttype tsym;
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int voidval;
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enum exp_opcode opcode;
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struct internalvar *ivar;
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struct stoken_vector svec;
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}
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%{
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/* YYSTYPE gets defined by %union. */
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static int parse_number (struct parser_state *,
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const char *, int, int, YYSTYPE *);
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static int parse_go_float (struct gdbarch *gdbarch, const char *p, int len,
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DOUBLEST *d, struct type **t);
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%}
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%type <voidval> exp exp1 type_exp start variable lcurly
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%type <lval> rcurly
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%type <tval> type
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%token <typed_val_int> INT
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%token <typed_val_float> FLOAT
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/* Both NAME and TYPENAME tokens represent symbols in the input,
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and both convey their data as strings.
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But a TYPENAME is a string that happens to be defined as a type
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or builtin type name (such as int or char)
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and a NAME is any other symbol.
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Contexts where this distinction is not important can use the
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nonterminal "name", which matches either NAME or TYPENAME. */
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%token <tsval> RAW_STRING
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%token <tsval> STRING
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%token <tsval> CHAR
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%token <ssym> NAME
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%token <tsym> TYPENAME /* Not TYPE_NAME cus already taken. */
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%token <voidval> COMPLETE
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/*%type <sval> name*/
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%type <svec> string_exp
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%type <ssym> name_not_typename
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/* A NAME_OR_INT is a symbol which is not known in the symbol table,
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but which would parse as a valid number in the current input radix.
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E.g. "c" when input_radix==16. Depending on the parse, it will be
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turned into a name or into a number. */
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%token <ssym> NAME_OR_INT
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%token <lval> TRUE_KEYWORD FALSE_KEYWORD
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%token STRUCT_KEYWORD INTERFACE_KEYWORD TYPE_KEYWORD CHAN_KEYWORD
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%token SIZEOF_KEYWORD
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%token LEN_KEYWORD CAP_KEYWORD
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%token NEW_KEYWORD
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%token IOTA_KEYWORD NIL_KEYWORD
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%token CONST_KEYWORD
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%token DOTDOTDOT
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%token ENTRY
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%token ERROR
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/* Special type cases. */
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%token BYTE_KEYWORD /* An alias of uint8. */
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%token <sval> DOLLAR_VARIABLE
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%token <opcode> ASSIGN_MODIFY
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%left ','
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%left ABOVE_COMMA
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%right '=' ASSIGN_MODIFY
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%right '?'
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%left OROR
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%left ANDAND
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%left '|'
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%left '^'
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%left '&'
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%left ANDNOT
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%left EQUAL NOTEQUAL
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%left '<' '>' LEQ GEQ
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%left LSH RSH
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%left '@'
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%left '+' '-'
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%left '*' '/' '%'
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%right UNARY INCREMENT DECREMENT
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%right LEFT_ARROW '.' '[' '('
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%%
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start : exp1
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| type_exp
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;
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type_exp: type
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{ write_exp_elt_opcode (pstate, OP_TYPE);
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write_exp_elt_type (pstate, $1);
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write_exp_elt_opcode (pstate, OP_TYPE); }
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;
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/* Expressions, including the comma operator. */
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exp1 : exp
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| exp1 ',' exp
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{ write_exp_elt_opcode (pstate, BINOP_COMMA); }
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;
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/* Expressions, not including the comma operator. */
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exp : '*' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_IND); }
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;
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exp : '&' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_ADDR); }
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;
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exp : '-' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_NEG); }
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;
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exp : '+' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
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;
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exp : '!' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
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;
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exp : '^' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_COMPLEMENT); }
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;
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exp : exp INCREMENT %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_POSTINCREMENT); }
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;
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exp : exp DECREMENT %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_POSTDECREMENT); }
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;
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/* foo->bar is not in Go. May want as a gdb extension. Later. */
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exp : exp '.' name_not_typename
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{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
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write_exp_string (pstate, $3.stoken);
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write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
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;
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exp : exp '.' name_not_typename COMPLETE
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{ mark_struct_expression (pstate);
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write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
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write_exp_string (pstate, $3.stoken);
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write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
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;
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exp : exp '.' COMPLETE
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{ struct stoken s;
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mark_struct_expression (pstate);
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write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
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s.ptr = "";
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s.length = 0;
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write_exp_string (pstate, s);
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write_exp_elt_opcode (pstate, STRUCTOP_STRUCT); }
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;
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exp : exp '[' exp1 ']'
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{ write_exp_elt_opcode (pstate, BINOP_SUBSCRIPT); }
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;
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exp : exp '('
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/* This is to save the value of arglist_len
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being accumulated by an outer function call. */
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{ start_arglist (); }
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arglist ')' %prec LEFT_ARROW
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{ write_exp_elt_opcode (pstate, OP_FUNCALL);
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write_exp_elt_longcst (pstate,
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(LONGEST) end_arglist ());
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write_exp_elt_opcode (pstate, OP_FUNCALL); }
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;
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lcurly : '{'
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{ start_arglist (); }
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;
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arglist :
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;
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arglist : exp
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{ arglist_len = 1; }
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;
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arglist : arglist ',' exp %prec ABOVE_COMMA
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{ arglist_len++; }
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;
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rcurly : '}'
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{ $$ = end_arglist () - 1; }
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;
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exp : lcurly type rcurly exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_MEMVAL);
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write_exp_elt_type (pstate, $2);
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write_exp_elt_opcode (pstate, UNOP_MEMVAL); }
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;
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exp : type '(' exp ')' %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_CAST);
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write_exp_elt_type (pstate, $1);
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write_exp_elt_opcode (pstate, UNOP_CAST); }
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;
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exp : '(' exp1 ')'
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{ }
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;
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/* Binary operators in order of decreasing precedence. */
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exp : exp '@' exp
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{ write_exp_elt_opcode (pstate, BINOP_REPEAT); }
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;
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exp : exp '*' exp
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{ write_exp_elt_opcode (pstate, BINOP_MUL); }
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;
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exp : exp '/' exp
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{ write_exp_elt_opcode (pstate, BINOP_DIV); }
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;
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exp : exp '%' exp
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{ write_exp_elt_opcode (pstate, BINOP_REM); }
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;
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exp : exp '+' exp
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{ write_exp_elt_opcode (pstate, BINOP_ADD); }
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;
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exp : exp '-' exp
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{ write_exp_elt_opcode (pstate, BINOP_SUB); }
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;
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exp : exp LSH exp
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{ write_exp_elt_opcode (pstate, BINOP_LSH); }
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;
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exp : exp RSH exp
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{ write_exp_elt_opcode (pstate, BINOP_RSH); }
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;
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exp : exp EQUAL exp
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{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
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;
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exp : exp NOTEQUAL exp
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{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
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;
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exp : exp LEQ exp
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{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
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;
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exp : exp GEQ exp
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{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
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;
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exp : exp '<' exp
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{ write_exp_elt_opcode (pstate, BINOP_LESS); }
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;
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exp : exp '>' exp
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{ write_exp_elt_opcode (pstate, BINOP_GTR); }
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;
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exp : exp '&' exp
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{ write_exp_elt_opcode (pstate, BINOP_BITWISE_AND); }
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;
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exp : exp '^' exp
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{ write_exp_elt_opcode (pstate, BINOP_BITWISE_XOR); }
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;
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exp : exp '|' exp
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{ write_exp_elt_opcode (pstate, BINOP_BITWISE_IOR); }
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;
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exp : exp ANDAND exp
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{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
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;
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exp : exp OROR exp
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{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
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;
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exp : exp '?' exp ':' exp %prec '?'
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{ write_exp_elt_opcode (pstate, TERNOP_COND); }
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;
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exp : exp '=' exp
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{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
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;
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exp : exp ASSIGN_MODIFY exp
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{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
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write_exp_elt_opcode (pstate, $2);
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write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY); }
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;
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exp : INT
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{ write_exp_elt_opcode (pstate, OP_LONG);
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write_exp_elt_type (pstate, $1.type);
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write_exp_elt_longcst (pstate, (LONGEST)($1.val));
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write_exp_elt_opcode (pstate, OP_LONG); }
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||
;
|
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exp : CHAR
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||
{
|
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struct stoken_vector vec;
|
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vec.len = 1;
|
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vec.tokens = &$1;
|
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write_exp_string_vector (pstate, $1.type, &vec);
|
||
}
|
||
;
|
||
|
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exp : NAME_OR_INT
|
||
{ YYSTYPE val;
|
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parse_number (pstate, $1.stoken.ptr,
|
||
$1.stoken.length, 0, &val);
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
write_exp_elt_type (pstate, val.typed_val_int.type);
|
||
write_exp_elt_longcst (pstate, (LONGEST)
|
||
val.typed_val_int.val);
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
}
|
||
;
|
||
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||
|
||
exp : FLOAT
|
||
{ write_exp_elt_opcode (pstate, OP_DOUBLE);
|
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write_exp_elt_type (pstate, $1.type);
|
||
write_exp_elt_dblcst (pstate, $1.dval);
|
||
write_exp_elt_opcode (pstate, OP_DOUBLE); }
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;
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||
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exp : variable
|
||
;
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||
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exp : DOLLAR_VARIABLE
|
||
{
|
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write_dollar_variable (pstate, $1);
|
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}
|
||
;
|
||
|
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exp : SIZEOF_KEYWORD '(' type ')' %prec UNARY
|
||
{
|
||
/* TODO(dje): Go objects in structs. */
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
/* TODO(dje): What's the right type here? */
|
||
write_exp_elt_type
|
||
(pstate,
|
||
parse_type (pstate)->builtin_unsigned_int);
|
||
CHECK_TYPEDEF ($3);
|
||
write_exp_elt_longcst (pstate,
|
||
(LONGEST) TYPE_LENGTH ($3));
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
}
|
||
;
|
||
|
||
exp : SIZEOF_KEYWORD '(' exp ')' %prec UNARY
|
||
{
|
||
/* TODO(dje): Go objects in structs. */
|
||
write_exp_elt_opcode (pstate, UNOP_SIZEOF);
|
||
}
|
||
|
||
string_exp:
|
||
STRING
|
||
{
|
||
/* We copy the string here, and not in the
|
||
lexer, to guarantee that we do not leak a
|
||
string. */
|
||
/* Note that we NUL-terminate here, but just
|
||
for convenience. */
|
||
struct typed_stoken *vec = XNEW (struct typed_stoken);
|
||
$$.len = 1;
|
||
$$.tokens = vec;
|
||
|
||
vec->type = $1.type;
|
||
vec->length = $1.length;
|
||
vec->ptr = malloc ($1.length + 1);
|
||
memcpy (vec->ptr, $1.ptr, $1.length + 1);
|
||
}
|
||
|
||
| string_exp '+' STRING
|
||
{
|
||
/* Note that we NUL-terminate here, but just
|
||
for convenience. */
|
||
char *p;
|
||
++$$.len;
|
||
$$.tokens = realloc ($$.tokens,
|
||
$$.len * sizeof (struct typed_stoken));
|
||
|
||
p = malloc ($3.length + 1);
|
||
memcpy (p, $3.ptr, $3.length + 1);
|
||
|
||
$$.tokens[$$.len - 1].type = $3.type;
|
||
$$.tokens[$$.len - 1].length = $3.length;
|
||
$$.tokens[$$.len - 1].ptr = p;
|
||
}
|
||
;
|
||
|
||
exp : string_exp %prec ABOVE_COMMA
|
||
{
|
||
int i;
|
||
|
||
write_exp_string_vector (pstate, 0 /*always utf8*/,
|
||
&$1);
|
||
for (i = 0; i < $1.len; ++i)
|
||
free ($1.tokens[i].ptr);
|
||
free ($1.tokens);
|
||
}
|
||
;
|
||
|
||
exp : TRUE_KEYWORD
|
||
{ write_exp_elt_opcode (pstate, OP_BOOL);
|
||
write_exp_elt_longcst (pstate, (LONGEST) $1);
|
||
write_exp_elt_opcode (pstate, OP_BOOL); }
|
||
;
|
||
|
||
exp : FALSE_KEYWORD
|
||
{ write_exp_elt_opcode (pstate, OP_BOOL);
|
||
write_exp_elt_longcst (pstate, (LONGEST) $1);
|
||
write_exp_elt_opcode (pstate, OP_BOOL); }
|
||
;
|
||
|
||
variable: name_not_typename ENTRY
|
||
{ struct symbol *sym = $1.sym;
|
||
|
||
if (sym == NULL
|
||
|| !SYMBOL_IS_ARGUMENT (sym)
|
||
|| !symbol_read_needs_frame (sym))
|
||
error (_("@entry can be used only for function "
|
||
"parameters, not for \"%s\""),
|
||
copy_name ($1.stoken));
|
||
|
||
write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
|
||
write_exp_elt_sym (pstate, sym);
|
||
write_exp_elt_opcode (pstate, OP_VAR_ENTRY_VALUE);
|
||
}
|
||
;
|
||
|
||
variable: name_not_typename
|
||
{ struct symbol *sym = $1.sym;
|
||
|
||
if (sym)
|
||
{
|
||
if (symbol_read_needs_frame (sym))
|
||
{
|
||
if (innermost_block == 0
|
||
|| contained_in (block_found,
|
||
innermost_block))
|
||
innermost_block = block_found;
|
||
}
|
||
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
/* We want to use the selected frame, not
|
||
another more inner frame which happens to
|
||
be in the same block. */
|
||
write_exp_elt_block (pstate, NULL);
|
||
write_exp_elt_sym (pstate, sym);
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
}
|
||
else if ($1.is_a_field_of_this)
|
||
{
|
||
/* TODO(dje): Can we get here?
|
||
E.g., via a mix of c++ and go? */
|
||
gdb_assert_not_reached ("go with `this' field");
|
||
}
|
||
else
|
||
{
|
||
struct bound_minimal_symbol msymbol;
|
||
char *arg = copy_name ($1.stoken);
|
||
|
||
msymbol =
|
||
lookup_bound_minimal_symbol (arg);
|
||
if (msymbol.minsym != NULL)
|
||
write_exp_msymbol (pstate, msymbol);
|
||
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."),
|
||
copy_name ($1.stoken));
|
||
}
|
||
}
|
||
;
|
||
|
||
/* TODO
|
||
method_exp: PACKAGENAME '.' name '.' name
|
||
{
|
||
}
|
||
;
|
||
*/
|
||
|
||
type /* Implements (approximately): [*] type-specifier */
|
||
: '*' type
|
||
{ $$ = lookup_pointer_type ($2); }
|
||
| TYPENAME
|
||
{ $$ = $1.type; }
|
||
/*
|
||
| STRUCT_KEYWORD name
|
||
{ $$ = lookup_struct (copy_name ($2),
|
||
expression_context_block); }
|
||
*/
|
||
| BYTE_KEYWORD
|
||
{ $$ = builtin_go_type (parse_gdbarch (pstate))
|
||
->builtin_uint8; }
|
||
;
|
||
|
||
/* TODO
|
||
name : NAME { $$ = $1.stoken; }
|
||
| TYPENAME { $$ = $1.stoken; }
|
||
| NAME_OR_INT { $$ = $1.stoken; }
|
||
;
|
||
*/
|
||
|
||
name_not_typename
|
||
: NAME
|
||
/* These would be useful if name_not_typename was useful, but it is just
|
||
a fake for "variable", so these cause reduce/reduce conflicts because
|
||
the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
|
||
=exp) or just an exp. If name_not_typename was ever used in an lvalue
|
||
context where only a name could occur, this might be useful.
|
||
| NAME_OR_INT
|
||
*/
|
||
;
|
||
|
||
%%
|
||
|
||
/* Wrapper on parse_c_float to get the type right for Go. */
|
||
|
||
static int
|
||
parse_go_float (struct gdbarch *gdbarch, const char *p, int len,
|
||
DOUBLEST *d, struct type **t)
|
||
{
|
||
int result = parse_c_float (gdbarch, p, len, d, t);
|
||
const struct builtin_type *builtin_types = builtin_type (gdbarch);
|
||
const struct builtin_go_type *builtin_go_types = builtin_go_type (gdbarch);
|
||
|
||
if (*t == builtin_types->builtin_float)
|
||
*t = builtin_go_types->builtin_float32;
|
||
else if (*t == builtin_types->builtin_double)
|
||
*t = builtin_go_types->builtin_float64;
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Take care of parsing a number (anything that starts with a digit).
|
||
Set yylval and return the token type; update lexptr.
|
||
LEN is the number of characters in it. */
|
||
|
||
/* FIXME: Needs some error checking for the float case. */
|
||
/* FIXME(dje): IWBN to use c-exp.y's parse_number if we could.
|
||
That will require moving the guts into a function that we both call
|
||
as our YYSTYPE is different than c-exp.y's */
|
||
|
||
static int
|
||
parse_number (struct parser_state *par_state,
|
||
const char *p, int len, int parsed_float, YYSTYPE *putithere)
|
||
{
|
||
/* FIXME: Shouldn't these be unsigned? We don't deal with negative values
|
||
here, and we do kind of silly things like cast to unsigned. */
|
||
LONGEST n = 0;
|
||
LONGEST prevn = 0;
|
||
ULONGEST un;
|
||
|
||
int i = 0;
|
||
int c;
|
||
int base = input_radix;
|
||
int unsigned_p = 0;
|
||
|
||
/* Number of "L" suffixes encountered. */
|
||
int long_p = 0;
|
||
|
||
/* We have found a "L" or "U" suffix. */
|
||
int found_suffix = 0;
|
||
|
||
ULONGEST high_bit;
|
||
struct type *signed_type;
|
||
struct type *unsigned_type;
|
||
|
||
if (parsed_float)
|
||
{
|
||
if (! parse_go_float (parse_gdbarch (par_state), p, len,
|
||
&putithere->typed_val_float.dval,
|
||
&putithere->typed_val_float.type))
|
||
return ERROR;
|
||
return FLOAT;
|
||
}
|
||
|
||
/* Handle base-switching prefixes 0x, 0t, 0d, 0. */
|
||
if (p[0] == '0')
|
||
switch (p[1])
|
||
{
|
||
case 'x':
|
||
case 'X':
|
||
if (len >= 3)
|
||
{
|
||
p += 2;
|
||
base = 16;
|
||
len -= 2;
|
||
}
|
||
break;
|
||
|
||
case 'b':
|
||
case 'B':
|
||
if (len >= 3)
|
||
{
|
||
p += 2;
|
||
base = 2;
|
||
len -= 2;
|
||
}
|
||
break;
|
||
|
||
case 't':
|
||
case 'T':
|
||
case 'd':
|
||
case 'D':
|
||
if (len >= 3)
|
||
{
|
||
p += 2;
|
||
base = 10;
|
||
len -= 2;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
base = 8;
|
||
break;
|
||
}
|
||
|
||
while (len-- > 0)
|
||
{
|
||
c = *p++;
|
||
if (c >= 'A' && c <= 'Z')
|
||
c += 'a' - 'A';
|
||
if (c != 'l' && c != 'u')
|
||
n *= base;
|
||
if (c >= '0' && c <= '9')
|
||
{
|
||
if (found_suffix)
|
||
return ERROR;
|
||
n += i = c - '0';
|
||
}
|
||
else
|
||
{
|
||
if (base > 10 && c >= 'a' && c <= 'f')
|
||
{
|
||
if (found_suffix)
|
||
return ERROR;
|
||
n += i = c - 'a' + 10;
|
||
}
|
||
else if (c == 'l')
|
||
{
|
||
++long_p;
|
||
found_suffix = 1;
|
||
}
|
||
else if (c == 'u')
|
||
{
|
||
unsigned_p = 1;
|
||
found_suffix = 1;
|
||
}
|
||
else
|
||
return ERROR; /* Char not a digit */
|
||
}
|
||
if (i >= base)
|
||
return ERROR; /* Invalid digit in this base. */
|
||
|
||
/* Portably test for overflow (only works for nonzero values, so make
|
||
a second check for zero). FIXME: Can't we just make n and prevn
|
||
unsigned and avoid this? */
|
||
if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
|
||
unsigned_p = 1; /* Try something unsigned. */
|
||
|
||
/* Portably test for unsigned overflow.
|
||
FIXME: This check is wrong; for example it doesn't find overflow
|
||
on 0x123456789 when LONGEST is 32 bits. */
|
||
if (c != 'l' && c != 'u' && n != 0)
|
||
{
|
||
if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
|
||
error (_("Numeric constant too large."));
|
||
}
|
||
prevn = n;
|
||
}
|
||
|
||
/* An integer constant is an int, a long, or a long long. An L
|
||
suffix forces it to be long; an LL suffix forces it to be long
|
||
long. If not forced to a larger size, it gets the first type of
|
||
the above that it fits in. To figure out whether it fits, we
|
||
shift it right and see whether anything remains. Note that we
|
||
can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
|
||
operation, because many compilers will warn about such a shift
|
||
(which always produces a zero result). Sometimes gdbarch_int_bit
|
||
or gdbarch_long_bit will be that big, sometimes not. To deal with
|
||
the case where it is we just always shift the value more than
|
||
once, with fewer bits each time. */
|
||
|
||
un = (ULONGEST)n >> 2;
|
||
if (long_p == 0
|
||
&& (un >> (gdbarch_int_bit (parse_gdbarch (par_state)) - 2)) == 0)
|
||
{
|
||
high_bit
|
||
= ((ULONGEST)1) << (gdbarch_int_bit (parse_gdbarch (par_state)) - 1);
|
||
|
||
/* A large decimal (not hex or octal) constant (between INT_MAX
|
||
and UINT_MAX) is a long or unsigned long, according to ANSI,
|
||
never an unsigned int, but this code treats it as unsigned
|
||
int. This probably should be fixed. GCC gives a warning on
|
||
such constants. */
|
||
|
||
unsigned_type = parse_type (par_state)->builtin_unsigned_int;
|
||
signed_type = parse_type (par_state)->builtin_int;
|
||
}
|
||
else if (long_p <= 1
|
||
&& (un >> (gdbarch_long_bit (parse_gdbarch (par_state)) - 2)) == 0)
|
||
{
|
||
high_bit
|
||
= ((ULONGEST)1) << (gdbarch_long_bit (parse_gdbarch (par_state)) - 1);
|
||
unsigned_type = parse_type (par_state)->builtin_unsigned_long;
|
||
signed_type = parse_type (par_state)->builtin_long;
|
||
}
|
||
else
|
||
{
|
||
int shift;
|
||
if (sizeof (ULONGEST) * HOST_CHAR_BIT
|
||
< gdbarch_long_long_bit (parse_gdbarch (par_state)))
|
||
/* A long long does not fit in a LONGEST. */
|
||
shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
|
||
else
|
||
shift = (gdbarch_long_long_bit (parse_gdbarch (par_state)) - 1);
|
||
high_bit = (ULONGEST) 1 << shift;
|
||
unsigned_type = parse_type (par_state)->builtin_unsigned_long_long;
|
||
signed_type = parse_type (par_state)->builtin_long_long;
|
||
}
|
||
|
||
putithere->typed_val_int.val = n;
|
||
|
||
/* If the high bit of the worked out type is set then this number
|
||
has to be unsigned. */
|
||
|
||
if (unsigned_p || (n & high_bit))
|
||
{
|
||
putithere->typed_val_int.type = unsigned_type;
|
||
}
|
||
else
|
||
{
|
||
putithere->typed_val_int.type = signed_type;
|
||
}
|
||
|
||
return INT;
|
||
}
|
||
|
||
/* Temporary obstack used for holding strings. */
|
||
static struct obstack tempbuf;
|
||
static int tempbuf_init;
|
||
|
||
/* Parse a string or character literal from TOKPTR. The string or
|
||
character may be wide or unicode. *OUTPTR is set to just after the
|
||
end of the literal in the input string. The resulting token is
|
||
stored in VALUE. This returns a token value, either STRING or
|
||
CHAR, depending on what was parsed. *HOST_CHARS is set to the
|
||
number of host characters in the literal. */
|
||
|
||
static int
|
||
parse_string_or_char (const char *tokptr, const char **outptr,
|
||
struct typed_stoken *value, int *host_chars)
|
||
{
|
||
int quote;
|
||
|
||
/* Build the gdb internal form of the input string in tempbuf. Note
|
||
that the buffer is null byte terminated *only* for the
|
||
convenience of debugging gdb itself and printing the buffer
|
||
contents when the buffer contains no embedded nulls. Gdb does
|
||
not depend upon the buffer being null byte terminated, it uses
|
||
the length string instead. This allows gdb to handle C strings
|
||
(as well as strings in other languages) with embedded null
|
||
bytes */
|
||
|
||
if (!tempbuf_init)
|
||
tempbuf_init = 1;
|
||
else
|
||
obstack_free (&tempbuf, NULL);
|
||
obstack_init (&tempbuf);
|
||
|
||
/* Skip the quote. */
|
||
quote = *tokptr;
|
||
++tokptr;
|
||
|
||
*host_chars = 0;
|
||
|
||
while (*tokptr)
|
||
{
|
||
char c = *tokptr;
|
||
if (c == '\\')
|
||
{
|
||
++tokptr;
|
||
*host_chars += c_parse_escape (&tokptr, &tempbuf);
|
||
}
|
||
else if (c == quote)
|
||
break;
|
||
else
|
||
{
|
||
obstack_1grow (&tempbuf, c);
|
||
++tokptr;
|
||
/* FIXME: this does the wrong thing with multi-byte host
|
||
characters. We could use mbrlen here, but that would
|
||
make "set host-charset" a bit less useful. */
|
||
++*host_chars;
|
||
}
|
||
}
|
||
|
||
if (*tokptr != quote)
|
||
{
|
||
if (quote == '"')
|
||
error (_("Unterminated string in expression."));
|
||
else
|
||
error (_("Unmatched single quote."));
|
||
}
|
||
++tokptr;
|
||
|
||
value->type = C_STRING | (quote == '\'' ? C_CHAR : 0); /*FIXME*/
|
||
value->ptr = obstack_base (&tempbuf);
|
||
value->length = obstack_object_size (&tempbuf);
|
||
|
||
*outptr = tokptr;
|
||
|
||
return quote == '\'' ? CHAR : STRING;
|
||
}
|
||
|
||
struct token
|
||
{
|
||
char *operator;
|
||
int token;
|
||
enum exp_opcode opcode;
|
||
};
|
||
|
||
static const struct token tokentab3[] =
|
||
{
|
||
{">>=", ASSIGN_MODIFY, BINOP_RSH},
|
||
{"<<=", ASSIGN_MODIFY, BINOP_LSH},
|
||
/*{"&^=", ASSIGN_MODIFY, BINOP_BITWISE_ANDNOT}, TODO */
|
||
{"...", DOTDOTDOT, OP_NULL},
|
||
};
|
||
|
||
static const struct token tokentab2[] =
|
||
{
|
||
{"+=", ASSIGN_MODIFY, BINOP_ADD},
|
||
{"-=", ASSIGN_MODIFY, BINOP_SUB},
|
||
{"*=", ASSIGN_MODIFY, BINOP_MUL},
|
||
{"/=", ASSIGN_MODIFY, BINOP_DIV},
|
||
{"%=", ASSIGN_MODIFY, BINOP_REM},
|
||
{"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
|
||
{"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
|
||
{"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
|
||
{"++", INCREMENT, BINOP_END},
|
||
{"--", DECREMENT, BINOP_END},
|
||
/*{"->", RIGHT_ARROW, BINOP_END}, Doesn't exist in Go. */
|
||
{"<-", LEFT_ARROW, BINOP_END},
|
||
{"&&", ANDAND, BINOP_END},
|
||
{"||", OROR, BINOP_END},
|
||
{"<<", LSH, BINOP_END},
|
||
{">>", RSH, BINOP_END},
|
||
{"==", EQUAL, BINOP_END},
|
||
{"!=", NOTEQUAL, BINOP_END},
|
||
{"<=", LEQ, BINOP_END},
|
||
{">=", GEQ, BINOP_END},
|
||
/*{"&^", ANDNOT, BINOP_END}, TODO */
|
||
};
|
||
|
||
/* Identifier-like tokens. */
|
||
static const struct token ident_tokens[] =
|
||
{
|
||
{"true", TRUE_KEYWORD, OP_NULL},
|
||
{"false", FALSE_KEYWORD, OP_NULL},
|
||
{"nil", NIL_KEYWORD, OP_NULL},
|
||
{"const", CONST_KEYWORD, OP_NULL},
|
||
{"struct", STRUCT_KEYWORD, OP_NULL},
|
||
{"type", TYPE_KEYWORD, OP_NULL},
|
||
{"interface", INTERFACE_KEYWORD, OP_NULL},
|
||
{"chan", CHAN_KEYWORD, OP_NULL},
|
||
{"byte", BYTE_KEYWORD, OP_NULL}, /* An alias of uint8. */
|
||
{"len", LEN_KEYWORD, OP_NULL},
|
||
{"cap", CAP_KEYWORD, OP_NULL},
|
||
{"new", NEW_KEYWORD, OP_NULL},
|
||
{"iota", IOTA_KEYWORD, OP_NULL},
|
||
};
|
||
|
||
/* This is set if a NAME token appeared at the very end of the input
|
||
string, with no whitespace separating the name from the EOF. This
|
||
is used only when parsing to do field name completion. */
|
||
static int saw_name_at_eof;
|
||
|
||
/* This is set if the previously-returned token was a structure
|
||
operator -- either '.' or ARROW. This is used only when parsing to
|
||
do field name completion. */
|
||
static int last_was_structop;
|
||
|
||
/* Read one token, getting characters through lexptr. */
|
||
|
||
static int
|
||
lex_one_token (struct parser_state *par_state)
|
||
{
|
||
int c;
|
||
int namelen;
|
||
unsigned int i;
|
||
const char *tokstart;
|
||
int saw_structop = last_was_structop;
|
||
char *copy;
|
||
|
||
last_was_structop = 0;
|
||
|
||
retry:
|
||
|
||
prev_lexptr = lexptr;
|
||
|
||
tokstart = lexptr;
|
||
/* See if it is a special token of length 3. */
|
||
for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
|
||
if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
|
||
{
|
||
lexptr += 3;
|
||
yylval.opcode = tokentab3[i].opcode;
|
||
return tokentab3[i].token;
|
||
}
|
||
|
||
/* See if it is a special token of length 2. */
|
||
for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
|
||
if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
|
||
{
|
||
lexptr += 2;
|
||
yylval.opcode = tokentab2[i].opcode;
|
||
/* NOTE: -> doesn't exist in Go, so we don't need to watch for
|
||
setting last_was_structop here. */
|
||
return tokentab2[i].token;
|
||
}
|
||
|
||
switch (c = *tokstart)
|
||
{
|
||
case 0:
|
||
if (saw_name_at_eof)
|
||
{
|
||
saw_name_at_eof = 0;
|
||
return COMPLETE;
|
||
}
|
||
else if (saw_structop)
|
||
return COMPLETE;
|
||
else
|
||
return 0;
|
||
|
||
case ' ':
|
||
case '\t':
|
||
case '\n':
|
||
lexptr++;
|
||
goto retry;
|
||
|
||
case '[':
|
||
case '(':
|
||
paren_depth++;
|
||
lexptr++;
|
||
return c;
|
||
|
||
case ']':
|
||
case ')':
|
||
if (paren_depth == 0)
|
||
return 0;
|
||
paren_depth--;
|
||
lexptr++;
|
||
return c;
|
||
|
||
case ',':
|
||
if (comma_terminates
|
||
&& paren_depth == 0)
|
||
return 0;
|
||
lexptr++;
|
||
return c;
|
||
|
||
case '.':
|
||
/* Might be a floating point number. */
|
||
if (lexptr[1] < '0' || lexptr[1] > '9')
|
||
{
|
||
if (parse_completion)
|
||
last_was_structop = 1;
|
||
goto symbol; /* Nope, must be a symbol. */
|
||
}
|
||
/* FALL THRU into number case. */
|
||
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
{
|
||
/* It's a number. */
|
||
int got_dot = 0, got_e = 0, toktype;
|
||
const char *p = tokstart;
|
||
int hex = input_radix > 10;
|
||
|
||
if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
|
||
{
|
||
p += 2;
|
||
hex = 1;
|
||
}
|
||
|
||
for (;; ++p)
|
||
{
|
||
/* This test includes !hex because 'e' is a valid hex digit
|
||
and thus does not indicate a floating point number when
|
||
the radix is hex. */
|
||
if (!hex && !got_e && (*p == 'e' || *p == 'E'))
|
||
got_dot = got_e = 1;
|
||
/* This test does not include !hex, because a '.' always indicates
|
||
a decimal floating point number regardless of the radix. */
|
||
else if (!got_dot && *p == '.')
|
||
got_dot = 1;
|
||
else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
|
||
&& (*p == '-' || *p == '+'))
|
||
/* This is the sign of the exponent, not the end of the
|
||
number. */
|
||
continue;
|
||
/* We will take any letters or digits. parse_number will
|
||
complain if past the radix, or if L or U are not final. */
|
||
else if ((*p < '0' || *p > '9')
|
||
&& ((*p < 'a' || *p > 'z')
|
||
&& (*p < 'A' || *p > 'Z')))
|
||
break;
|
||
}
|
||
toktype = parse_number (par_state, tokstart, p - tokstart,
|
||
got_dot|got_e, &yylval);
|
||
if (toktype == ERROR)
|
||
{
|
||
char *err_copy = (char *) alloca (p - tokstart + 1);
|
||
|
||
memcpy (err_copy, tokstart, p - tokstart);
|
||
err_copy[p - tokstart] = 0;
|
||
error (_("Invalid number \"%s\"."), err_copy);
|
||
}
|
||
lexptr = p;
|
||
return toktype;
|
||
}
|
||
|
||
case '@':
|
||
{
|
||
const char *p = &tokstart[1];
|
||
size_t len = strlen ("entry");
|
||
|
||
while (isspace (*p))
|
||
p++;
|
||
if (strncmp (p, "entry", len) == 0 && !isalnum (p[len])
|
||
&& p[len] != '_')
|
||
{
|
||
lexptr = &p[len];
|
||
return ENTRY;
|
||
}
|
||
}
|
||
/* FALLTHRU */
|
||
case '+':
|
||
case '-':
|
||
case '*':
|
||
case '/':
|
||
case '%':
|
||
case '|':
|
||
case '&':
|
||
case '^':
|
||
case '~':
|
||
case '!':
|
||
case '<':
|
||
case '>':
|
||
case '?':
|
||
case ':':
|
||
case '=':
|
||
case '{':
|
||
case '}':
|
||
symbol:
|
||
lexptr++;
|
||
return c;
|
||
|
||
case '\'':
|
||
case '"':
|
||
case '`':
|
||
{
|
||
int host_len;
|
||
int result = parse_string_or_char (tokstart, &lexptr, &yylval.tsval,
|
||
&host_len);
|
||
if (result == CHAR)
|
||
{
|
||
if (host_len == 0)
|
||
error (_("Empty character constant."));
|
||
else if (host_len > 2 && c == '\'')
|
||
{
|
||
++tokstart;
|
||
namelen = lexptr - tokstart - 1;
|
||
goto tryname;
|
||
}
|
||
else if (host_len > 1)
|
||
error (_("Invalid character constant."));
|
||
}
|
||
return result;
|
||
}
|
||
}
|
||
|
||
if (!(c == '_' || c == '$'
|
||
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
|
||
/* We must have come across a bad character (e.g. ';'). */
|
||
error (_("Invalid character '%c' in expression."), c);
|
||
|
||
/* It's a name. See how long it is. */
|
||
namelen = 0;
|
||
for (c = tokstart[namelen];
|
||
(c == '_' || c == '$' || (c >= '0' && c <= '9')
|
||
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));)
|
||
{
|
||
c = tokstart[++namelen];
|
||
}
|
||
|
||
/* The token "if" terminates the expression and is NOT removed from
|
||
the input stream. It doesn't count if it appears in the
|
||
expansion of a macro. */
|
||
if (namelen == 2
|
||
&& tokstart[0] == 'i'
|
||
&& tokstart[1] == 'f')
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* For the same reason (breakpoint conditions), "thread N"
|
||
terminates the expression. "thread" could be an identifier, but
|
||
an identifier is never followed by a number without intervening
|
||
punctuation.
|
||
Handle abbreviations of these, similarly to
|
||
breakpoint.c:find_condition_and_thread.
|
||
TODO: Watch for "goroutine" here? */
|
||
if (namelen >= 1
|
||
&& strncmp (tokstart, "thread", namelen) == 0
|
||
&& (tokstart[namelen] == ' ' || tokstart[namelen] == '\t'))
|
||
{
|
||
const char *p = tokstart + namelen + 1;
|
||
|
||
while (*p == ' ' || *p == '\t')
|
||
p++;
|
||
if (*p >= '0' && *p <= '9')
|
||
return 0;
|
||
}
|
||
|
||
lexptr += namelen;
|
||
|
||
tryname:
|
||
|
||
yylval.sval.ptr = tokstart;
|
||
yylval.sval.length = namelen;
|
||
|
||
/* Catch specific keywords. */
|
||
copy = copy_name (yylval.sval);
|
||
for (i = 0; i < sizeof (ident_tokens) / sizeof (ident_tokens[0]); i++)
|
||
if (strcmp (copy, ident_tokens[i].operator) == 0)
|
||
{
|
||
/* It is ok to always set this, even though we don't always
|
||
strictly need to. */
|
||
yylval.opcode = ident_tokens[i].opcode;
|
||
return ident_tokens[i].token;
|
||
}
|
||
|
||
if (*tokstart == '$')
|
||
return DOLLAR_VARIABLE;
|
||
|
||
if (parse_completion && *lexptr == '\0')
|
||
saw_name_at_eof = 1;
|
||
return NAME;
|
||
}
|
||
|
||
/* An object of this type is pushed on a FIFO by the "outer" lexer. */
|
||
typedef struct
|
||
{
|
||
int token;
|
||
YYSTYPE value;
|
||
} token_and_value;
|
||
|
||
DEF_VEC_O (token_and_value);
|
||
|
||
/* A FIFO of tokens that have been read but not yet returned to the
|
||
parser. */
|
||
static VEC (token_and_value) *token_fifo;
|
||
|
||
/* Non-zero if the lexer should return tokens from the FIFO. */
|
||
static int popping;
|
||
|
||
/* Temporary storage for yylex; this holds symbol names as they are
|
||
built up. */
|
||
static struct obstack name_obstack;
|
||
|
||
/* Build "package.name" in name_obstack.
|
||
For convenience of the caller, the name is NUL-terminated,
|
||
but the NUL is not included in the recorded length. */
|
||
|
||
static struct stoken
|
||
build_packaged_name (const char *package, int package_len,
|
||
const char *name, int name_len)
|
||
{
|
||
struct stoken result;
|
||
|
||
obstack_free (&name_obstack, obstack_base (&name_obstack));
|
||
obstack_grow (&name_obstack, package, package_len);
|
||
obstack_grow_str (&name_obstack, ".");
|
||
obstack_grow (&name_obstack, name, name_len);
|
||
obstack_grow (&name_obstack, "", 1);
|
||
result.ptr = obstack_base (&name_obstack);
|
||
result.length = obstack_object_size (&name_obstack) - 1;
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Return non-zero if NAME is a package name.
|
||
BLOCK is the scope in which to interpret NAME; this can be NULL
|
||
to mean the global scope. */
|
||
|
||
static int
|
||
package_name_p (const char *name, const struct block *block)
|
||
{
|
||
struct symbol *sym;
|
||
struct field_of_this_result is_a_field_of_this;
|
||
|
||
sym = lookup_symbol (name, block, STRUCT_DOMAIN, &is_a_field_of_this);
|
||
|
||
if (sym
|
||
&& SYMBOL_CLASS (sym) == LOC_TYPEDEF
|
||
&& TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_MODULE)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Classify a (potential) function in the "unsafe" package.
|
||
We fold these into "keywords" to keep things simple, at least until
|
||
something more complex is warranted. */
|
||
|
||
static int
|
||
classify_unsafe_function (struct stoken function_name)
|
||
{
|
||
char *copy = copy_name (function_name);
|
||
|
||
if (strcmp (copy, "Sizeof") == 0)
|
||
{
|
||
yylval.sval = function_name;
|
||
return SIZEOF_KEYWORD;
|
||
}
|
||
|
||
error (_("Unknown function in `unsafe' package: %s"), copy);
|
||
}
|
||
|
||
/* Classify token(s) "name1.name2" where name1 is known to be a package.
|
||
The contents of the token are in `yylval'.
|
||
Updates yylval and returns the new token type.
|
||
|
||
The result is one of NAME, NAME_OR_INT, or TYPENAME. */
|
||
|
||
static int
|
||
classify_packaged_name (const struct block *block)
|
||
{
|
||
char *copy;
|
||
struct symbol *sym;
|
||
struct field_of_this_result is_a_field_of_this;
|
||
|
||
copy = copy_name (yylval.sval);
|
||
|
||
sym = lookup_symbol (copy, block, VAR_DOMAIN, &is_a_field_of_this);
|
||
|
||
if (sym)
|
||
{
|
||
yylval.ssym.sym = sym;
|
||
yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
|
||
}
|
||
|
||
return NAME;
|
||
}
|
||
|
||
/* Classify a NAME token.
|
||
The contents of the token are in `yylval'.
|
||
Updates yylval and returns the new token type.
|
||
BLOCK is the block in which lookups start; this can be NULL
|
||
to mean the global scope.
|
||
|
||
The result is one of NAME, NAME_OR_INT, or TYPENAME. */
|
||
|
||
static int
|
||
classify_name (struct parser_state *par_state, const struct block *block)
|
||
{
|
||
struct type *type;
|
||
struct symbol *sym;
|
||
char *copy;
|
||
struct field_of_this_result is_a_field_of_this;
|
||
|
||
copy = copy_name (yylval.sval);
|
||
|
||
/* Try primitive types first so they win over bad/weird debug info. */
|
||
type = language_lookup_primitive_type (parse_language (par_state),
|
||
parse_gdbarch (par_state),
|
||
copy);
|
||
if (type != NULL)
|
||
{
|
||
/* NOTE: We take advantage of the fact that yylval coming in was a
|
||
NAME, and that struct ttype is a compatible extension of struct
|
||
stoken, so yylval.tsym.stoken is already filled in. */
|
||
yylval.tsym.type = type;
|
||
return TYPENAME;
|
||
}
|
||
|
||
/* TODO: What about other types? */
|
||
|
||
sym = lookup_symbol (copy, block, VAR_DOMAIN, &is_a_field_of_this);
|
||
|
||
if (sym)
|
||
{
|
||
yylval.ssym.sym = sym;
|
||
yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
|
||
return NAME;
|
||
}
|
||
|
||
/* If we didn't find a symbol, look again in the current package.
|
||
This is to, e.g., make "p global_var" work without having to specify
|
||
the package name. We intentionally only looks for objects in the
|
||
current package. */
|
||
|
||
{
|
||
char *current_package_name = go_block_package_name (block);
|
||
|
||
if (current_package_name != NULL)
|
||
{
|
||
struct stoken sval =
|
||
build_packaged_name (current_package_name,
|
||
strlen (current_package_name),
|
||
copy, strlen (copy));
|
||
|
||
xfree (current_package_name);
|
||
sym = lookup_symbol (sval.ptr, block, VAR_DOMAIN,
|
||
&is_a_field_of_this);
|
||
if (sym)
|
||
{
|
||
yylval.ssym.stoken = sval;
|
||
yylval.ssym.sym = sym;
|
||
yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
|
||
return NAME;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Input names that aren't symbols but ARE valid hex numbers, when
|
||
the input radix permits them, can be names or numbers depending
|
||
on the parse. Note we support radixes > 16 here. */
|
||
if ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
|
||
|| (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10))
|
||
{
|
||
YYSTYPE newlval; /* Its value is ignored. */
|
||
int hextype = parse_number (par_state, copy, yylval.sval.length,
|
||
0, &newlval);
|
||
if (hextype == INT)
|
||
{
|
||
yylval.ssym.sym = NULL;
|
||
yylval.ssym.is_a_field_of_this = 0;
|
||
return NAME_OR_INT;
|
||
}
|
||
}
|
||
|
||
yylval.ssym.sym = NULL;
|
||
yylval.ssym.is_a_field_of_this = 0;
|
||
return NAME;
|
||
}
|
||
|
||
/* This is taken from c-exp.y mostly to get something working.
|
||
The basic structure has been kept because we may yet need some of it. */
|
||
|
||
static int
|
||
yylex (void)
|
||
{
|
||
token_and_value current, next;
|
||
|
||
if (popping && !VEC_empty (token_and_value, token_fifo))
|
||
{
|
||
token_and_value tv = *VEC_index (token_and_value, token_fifo, 0);
|
||
VEC_ordered_remove (token_and_value, token_fifo, 0);
|
||
yylval = tv.value;
|
||
/* There's no need to fall through to handle package.name
|
||
as that can never happen here. In theory. */
|
||
return tv.token;
|
||
}
|
||
popping = 0;
|
||
|
||
current.token = lex_one_token (pstate);
|
||
|
||
/* TODO: Need a way to force specifying name1 as a package.
|
||
.name1.name2 ? */
|
||
|
||
if (current.token != NAME)
|
||
return current.token;
|
||
|
||
/* See if we have "name1 . name2". */
|
||
|
||
current.value = yylval;
|
||
next.token = lex_one_token (pstate);
|
||
next.value = yylval;
|
||
|
||
if (next.token == '.')
|
||
{
|
||
token_and_value name2;
|
||
|
||
name2.token = lex_one_token (pstate);
|
||
name2.value = yylval;
|
||
|
||
if (name2.token == NAME)
|
||
{
|
||
/* Ok, we have "name1 . name2". */
|
||
char *copy;
|
||
|
||
copy = copy_name (current.value.sval);
|
||
|
||
if (strcmp (copy, "unsafe") == 0)
|
||
{
|
||
popping = 1;
|
||
return classify_unsafe_function (name2.value.sval);
|
||
}
|
||
|
||
if (package_name_p (copy, expression_context_block))
|
||
{
|
||
popping = 1;
|
||
yylval.sval = build_packaged_name (current.value.sval.ptr,
|
||
current.value.sval.length,
|
||
name2.value.sval.ptr,
|
||
name2.value.sval.length);
|
||
return classify_packaged_name (expression_context_block);
|
||
}
|
||
}
|
||
|
||
VEC_safe_push (token_and_value, token_fifo, &next);
|
||
VEC_safe_push (token_and_value, token_fifo, &name2);
|
||
}
|
||
else
|
||
{
|
||
VEC_safe_push (token_and_value, token_fifo, &next);
|
||
}
|
||
|
||
/* If we arrive here we don't have a package-qualified name. */
|
||
|
||
popping = 1;
|
||
yylval = current.value;
|
||
return classify_name (pstate, expression_context_block);
|
||
}
|
||
|
||
int
|
||
go_parse (struct parser_state *par_state)
|
||
{
|
||
int result;
|
||
struct cleanup *back_to;
|
||
|
||
/* Setting up the parser state. */
|
||
gdb_assert (par_state != NULL);
|
||
pstate = par_state;
|
||
|
||
back_to = make_cleanup (null_cleanup, NULL);
|
||
|
||
make_cleanup_restore_integer (&yydebug);
|
||
make_cleanup_clear_parser_state (&pstate);
|
||
yydebug = parser_debug;
|
||
|
||
/* Initialize some state used by the lexer. */
|
||
last_was_structop = 0;
|
||
saw_name_at_eof = 0;
|
||
|
||
VEC_free (token_and_value, token_fifo);
|
||
popping = 0;
|
||
obstack_init (&name_obstack);
|
||
make_cleanup_obstack_free (&name_obstack);
|
||
|
||
result = yyparse ();
|
||
do_cleanups (back_to);
|
||
return result;
|
||
}
|
||
|
||
void
|
||
yyerror (char *msg)
|
||
{
|
||
if (prev_lexptr)
|
||
lexptr = prev_lexptr;
|
||
|
||
error (_("A %s in expression, near `%s'."), (msg ? msg : "error"), lexptr);
|
||
}
|