mirror of
https://sourceware.org/git/binutils-gdb.git
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63fc2437de
Sometimes it is convenient to be able to specify the exact bits of a
floating-point literal. For example, you may want to set a
floating-point register to a denormalized value, or to a particular
NaN.
In C, you can do this by combining the "{}" cast with an array
literal, like:
(gdb) p {double}{0x576488BDD2AE9FFE}
$1 = 9.8765449999999996e+112
This patch adds a somewhat similar idea to Ada. It extends the lexer
to allow "l" and "f" suffixes in a based literal. The "f" indicates a
floating-point literal, and the "l"s control the size of the
floating-point type.
Note that this differs from Ada's based real literals. I believe
those can also be used to control the bits of a floating-point value,
but they are a bit more cumbersome to use (simplest is binary but
that's also very lengthy). Also, these aren't implemented in GDB.
I chose not to allow this extension to work with based integer
literals with exponents. That didn't seem very useful.
712 lines
19 KiB
C++
712 lines
19 KiB
C++
/* FLEX lexer for Ada expressions, for GDB. -*- c++ -*-
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Copyright (C) 1994-2022 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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/*----------------------------------------------------------------------*/
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/* The converted version of this file is to be included in ada-exp.y, */
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/* the Ada parser for gdb. The function yylex obtains characters from */
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/* the global pointer lexptr. It returns a syntactic category for */
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/* each successive token and places a semantic value into yylval */
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/* (ada-lval), defined by the parser. */
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DIG [0-9]
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NUM10 ({DIG}({DIG}|_)*)
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HEXDIG [0-9a-f]
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NUM16 ({HEXDIG}({HEXDIG}|_)*)
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OCTDIG [0-7]
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LETTER [a-z_]
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ID ({LETTER}({LETTER}|{DIG}|[\x80-\xff])*|"<"{LETTER}({LETTER}|{DIG})*">")
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WHITE [ \t\n]
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TICK ("'"{WHITE}*)
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GRAPHIC [a-z0-9 #&'()*+,-./:;<>=_|!$%?@\[\]\\^`{}~]
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OPER ([-+*/=<>&]|"<="|">="|"**"|"/="|"and"|"or"|"xor"|"not"|"mod"|"rem"|"abs")
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EXP (e[+-]{NUM10})
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POSEXP (e"+"?{NUM10})
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%{
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#include "diagnostics.h"
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/* Some old versions of flex generate code that uses the "register" keyword,
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which clang warns about. This was observed for example with flex 2.5.35,
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as shipped with macOS 10.12. The same happens with flex 2.5.37 and g++ 11
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which defaults to ISO C++17, that does not allow register storage class
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specifiers. */
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DIAGNOSTIC_PUSH
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DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER
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#define NUMERAL_WIDTH 256
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#define LONGEST_SIGN ((ULONGEST) 1 << (sizeof(LONGEST) * HOST_CHAR_BIT - 1))
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/* Temporary staging for numeric literals. */
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static char numbuf[NUMERAL_WIDTH];
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static void canonicalizeNumeral (char *s1, const char *);
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static struct stoken processString (const char*, int);
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static int processInt (struct parser_state *, const char *, const char *,
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const char *);
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static int processReal (struct parser_state *, const char *);
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static struct stoken processId (const char *, int);
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static int processAttribute (const char *);
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static int find_dot_all (const char *);
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static void rewind_to_char (int);
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#undef YY_DECL
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#define YY_DECL static int yylex ( void )
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/* Flex generates a static function "input" which is not used.
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Defining YY_NO_INPUT comments it out. */
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#define YY_NO_INPUT
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#undef YY_INPUT
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#define YY_INPUT(BUF, RESULT, MAX_SIZE) \
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if ( *pstate->lexptr == '\000' ) \
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(RESULT) = YY_NULL; \
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else \
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{ \
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*(BUF) = *pstate->lexptr; \
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(RESULT) = 1; \
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pstate->lexptr += 1; \
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}
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static int find_dot_all (const char *);
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/* Depth of parentheses. */
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static int paren_depth;
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%}
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%option case-insensitive interactive nodefault noyywrap
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%s BEFORE_QUAL_QUOTE
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%%
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{WHITE} { }
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"--".* { yyterminate(); }
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{NUM10}{POSEXP} {
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canonicalizeNumeral (numbuf, yytext);
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char *e_ptr = strrchr (numbuf, 'e');
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*e_ptr = '\0';
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return processInt (pstate, nullptr, numbuf, e_ptr + 1);
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}
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{NUM10} {
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canonicalizeNumeral (numbuf, yytext);
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return processInt (pstate, NULL, numbuf, NULL);
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}
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{NUM10}"#"{HEXDIG}({HEXDIG}|_)*"#"{POSEXP} {
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canonicalizeNumeral (numbuf, yytext);
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char *e_ptr = strrchr (numbuf, 'e');
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*e_ptr = '\0';
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return processInt (pstate, numbuf,
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strchr (numbuf, '#') + 1,
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e_ptr + 1);
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}
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/* The "llf" is a gdb extension to allow a floating-point
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constant to be written in some other base. The
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floating-point number is formed by reinterpreting the
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bytes, allowing direct control over the bits. */
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{NUM10}(l{0,2}f)?"#"{HEXDIG}({HEXDIG}|_)*"#" {
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canonicalizeNumeral (numbuf, yytext);
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return processInt (pstate, numbuf, strchr (numbuf, '#') + 1,
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NULL);
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}
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"0x"{HEXDIG}+ {
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canonicalizeNumeral (numbuf, yytext+2);
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return processInt (pstate, "16#", numbuf, NULL);
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}
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{NUM10}"."{NUM10}{EXP} {
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canonicalizeNumeral (numbuf, yytext);
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return processReal (pstate, numbuf);
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}
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{NUM10}"."{NUM10} {
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canonicalizeNumeral (numbuf, yytext);
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return processReal (pstate, numbuf);
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}
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{NUM10}"#"{NUM16}"."{NUM16}"#"{EXP} {
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error (_("Based real literals not implemented yet."));
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}
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{NUM10}"#"{NUM16}"."{NUM16}"#" {
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error (_("Based real literals not implemented yet."));
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}
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<INITIAL>"'"({GRAPHIC}|\")"'" {
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yylval.typed_val.val = yytext[1];
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yylval.typed_val.type = type_for_char (pstate, yytext[1]);
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return CHARLIT;
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}
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<INITIAL>"'[\""{HEXDIG}{2,}"\"]'" {
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ULONGEST v = strtoulst (yytext+3, nullptr, 16);
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yylval.typed_val.val = v;
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yylval.typed_val.type = type_for_char (pstate, v);
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return CHARLIT;
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}
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/* Note that we don't handle bracket sequences of more than 2
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digits here. Currently there's no support for wide or
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wide-wide strings. */
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\"({GRAPHIC}|"[\""({HEXDIG}{2,}|\")"\"]")*\" {
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yylval.sval = processString (yytext+1, yyleng-2);
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return STRING;
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}
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\" {
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error (_("ill-formed or non-terminated string literal"));
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}
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if {
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rewind_to_char ('i');
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return 0;
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}
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task {
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rewind_to_char ('t');
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return 0;
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}
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thread{WHITE}+{DIG} {
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/* This keyword signals the end of the expression and
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will be processed separately. */
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rewind_to_char ('t');
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return 0;
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}
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/* ADA KEYWORDS */
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abs { return ABS; }
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and { return _AND_; }
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else { return ELSE; }
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in { return IN; }
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mod { return MOD; }
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new { return NEW; }
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not { return NOT; }
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null { return NULL_PTR; }
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or { return OR; }
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others { return OTHERS; }
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rem { return REM; }
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then { return THEN; }
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xor { return XOR; }
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/* BOOLEAN "KEYWORDS" */
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/* True and False are not keywords in Ada, but rather enumeration constants.
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However, the boolean type is no longer represented as an enum, so True
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and False are no longer defined in symbol tables. We compromise by
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making them keywords (when bare). */
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true { return TRUEKEYWORD; }
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false { return FALSEKEYWORD; }
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/* ATTRIBUTES */
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{TICK}[a-z][a-z_]+ { BEGIN INITIAL; return processAttribute (yytext+1); }
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/* PUNCTUATION */
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"=>" { return ARROW; }
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".." { return DOTDOT; }
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"**" { return STARSTAR; }
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":=" { return ASSIGN; }
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"/=" { return NOTEQUAL; }
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"<=" { return LEQ; }
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">=" { return GEQ; }
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<BEFORE_QUAL_QUOTE>"'" { BEGIN INITIAL; return '\''; }
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[-&*+./:<>=|;\[\]] { return yytext[0]; }
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"," { if (paren_depth == 0 && pstate->comma_terminates)
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{
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rewind_to_char (',');
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return 0;
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}
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else
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return ',';
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}
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"(" { paren_depth += 1; return '('; }
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")" { if (paren_depth == 0)
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{
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rewind_to_char (')');
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return 0;
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}
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else
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{
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paren_depth -= 1;
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return ')';
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}
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}
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"."{WHITE}*all { return DOT_ALL; }
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"."{WHITE}*{ID} {
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yylval.sval = processId (yytext+1, yyleng-1);
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return DOT_ID;
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}
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{ID}({WHITE}*"."{WHITE}*({ID}|\"{OPER}\"))*(" "*"'")? {
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int all_posn = find_dot_all (yytext);
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if (all_posn == -1 && yytext[yyleng-1] == '\'')
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{
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BEGIN BEFORE_QUAL_QUOTE;
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yyless (yyleng-1);
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}
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else if (all_posn >= 0)
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yyless (all_posn);
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yylval.sval = processId (yytext, yyleng);
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return NAME;
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}
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/* GDB EXPRESSION CONSTRUCTS */
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"'"[^']+"'"{WHITE}*:: {
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yyless (yyleng - 2);
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yylval.sval = processId (yytext, yyleng);
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return NAME;
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}
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"::" { return COLONCOLON; }
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[{}@] { return yytext[0]; }
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/* REGISTERS AND GDB CONVENIENCE VARIABLES */
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"$"({LETTER}|{DIG}|"$")* {
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yylval.sval.ptr = yytext;
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yylval.sval.length = yyleng;
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return DOLLAR_VARIABLE;
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}
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/* CATCH-ALL ERROR CASE */
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. { error (_("Invalid character '%s' in expression."), yytext); }
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%%
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#include <ctype.h>
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/* Initialize the lexer for processing new expression. */
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static void
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lexer_init (FILE *inp)
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{
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BEGIN INITIAL;
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paren_depth = 0;
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yyrestart (inp);
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}
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/* Copy S2 to S1, removing all underscores, and downcasing all letters. */
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static void
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canonicalizeNumeral (char *s1, const char *s2)
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{
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for (; *s2 != '\000'; s2 += 1)
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{
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if (*s2 != '_')
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{
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*s1 = tolower(*s2);
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s1 += 1;
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}
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}
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s1[0] = '\000';
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}
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/* Interprets the prefix of NUM that consists of digits of the given BASE
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as an integer of that BASE, with the string EXP as an exponent.
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Puts value in yylval, and returns INT, if the string is valid. Causes
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an error if the number is improperly formated. BASE, if NULL, defaults
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to "10", and EXP to "1". The EXP does not contain a leading 'e' or 'E'.
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*/
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static int
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processInt (struct parser_state *par_state, const char *base0,
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const char *num0, const char *exp0)
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{
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long exp;
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int base;
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/* For the based literal with an "f" prefix, we'll return a
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floating-point number. This counts the the number of "l"s seen,
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to decide the width of the floating-point number to return. -1
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means no "f". */
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int floating_point_l_count = -1;
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if (base0 == NULL)
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base = 10;
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else
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{
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char *end_of_base;
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base = strtol (base0, &end_of_base, 10);
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if (base < 2 || base > 16)
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error (_("Invalid base: %d."), base);
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while (*end_of_base == 'l')
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{
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++floating_point_l_count;
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++end_of_base;
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}
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/* This assertion is ensured by the pattern. */
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gdb_assert (floating_point_l_count == -1 || *end_of_base == 'f');
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if (*end_of_base == 'f')
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{
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++end_of_base;
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++floating_point_l_count;
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}
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/* This assertion is ensured by the pattern. */
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gdb_assert (*end_of_base == '#');
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}
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if (exp0 == NULL)
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exp = 0;
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else
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exp = strtol(exp0, (char **) NULL, 10);
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gdb_mpz result;
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while (isxdigit (*num0))
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{
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int dig = fromhex (*num0);
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if (dig >= base)
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error (_("Invalid digit `%c' in based literal"), *num0);
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mpz_mul_ui (result.val, result.val, base);
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mpz_add_ui (result.val, result.val, dig);
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++num0;
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}
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while (exp > 0)
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{
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mpz_mul_ui (result.val, result.val, base);
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exp -= 1;
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}
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if (floating_point_l_count > -1)
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{
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struct type *fp_type;
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if (floating_point_l_count == 0)
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fp_type = language_lookup_primitive_type (par_state->language (),
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par_state->gdbarch (),
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"float");
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else if (floating_point_l_count == 1)
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fp_type = language_lookup_primitive_type (par_state->language (),
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par_state->gdbarch (),
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"long_float");
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else
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{
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/* This assertion is ensured by the pattern. */
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gdb_assert (floating_point_l_count == 2);
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fp_type = language_lookup_primitive_type (par_state->language (),
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par_state->gdbarch (),
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"long_long_float");
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}
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yylval.typed_val_float.type = fp_type;
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result.write (gdb::make_array_view (yylval.typed_val_float.val,
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TYPE_LENGTH (fp_type)),
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type_byte_order (fp_type),
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true);
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return FLOAT;
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}
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gdb_mpz maxval (ULONGEST_MAX / base);
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if (mpz_cmp (result.val, maxval.val) > 0)
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error (_("Integer literal out of range"));
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LONGEST value = result.as_integer<LONGEST> ();
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if ((value >> (gdbarch_int_bit (par_state->gdbarch ())-1)) == 0)
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yylval.typed_val.type = type_int (par_state);
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else if ((value >> (gdbarch_long_bit (par_state->gdbarch ())-1)) == 0)
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yylval.typed_val.type = type_long (par_state);
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else if (((value >> (gdbarch_long_bit (par_state->gdbarch ())-1)) >> 1) == 0)
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{
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/* We have a number representable as an unsigned integer quantity.
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For consistency with the C treatment, we will treat it as an
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anonymous modular (unsigned) quantity. Alas, the types are such
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that we need to store .val as a signed quantity. Sorry
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for the mess, but C doesn't officially guarantee that a simple
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assignment does the trick (no, it doesn't; read the reference manual).
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*/
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yylval.typed_val.type
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= builtin_type (par_state->gdbarch ())->builtin_unsigned_long;
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if (value & LONGEST_SIGN)
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yylval.typed_val.val =
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(LONGEST) (value & ~LONGEST_SIGN)
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- (LONGEST_SIGN>>1) - (LONGEST_SIGN>>1);
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else
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yylval.typed_val.val = (LONGEST) value;
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return INT;
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}
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else
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yylval.typed_val.type = type_long_long (par_state);
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yylval.typed_val.val = value;
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return INT;
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}
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static int
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processReal (struct parser_state *par_state, const char *num0)
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{
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yylval.typed_val_float.type = type_long_double (par_state);
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bool parsed = parse_float (num0, strlen (num0),
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yylval.typed_val_float.type,
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yylval.typed_val_float.val);
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gdb_assert (parsed);
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return FLOAT;
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}
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/* Store a canonicalized version of NAME0[0..LEN-1] in yylval.ssym. The
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resulting string is valid until the next call to ada_parse. If
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NAME0 contains the substring "___", it is assumed to be already
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encoded and the resulting name is equal to it. Similarly, if the name
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starts with '<', it is copied verbatim. Otherwise, it differs
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from NAME0 in that:
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+ Characters between '...' are transfered verbatim to yylval.ssym.
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+ Trailing "'" characters in quoted sequences are removed (a leading quote is
|
|
preserved to indicate that the name is not to be GNAT-encoded).
|
|
+ Unquoted whitespace is removed.
|
|
+ Unquoted alphabetic characters are mapped to lower case.
|
|
Result is returned as a struct stoken, but for convenience, the string
|
|
is also null-terminated. Result string valid until the next call of
|
|
ada_parse.
|
|
*/
|
|
static struct stoken
|
|
processId (const char *name0, int len)
|
|
{
|
|
char *name = (char *) obstack_alloc (&temp_parse_space, len + 11);
|
|
int i0, i;
|
|
struct stoken result;
|
|
|
|
result.ptr = name;
|
|
while (len > 0 && isspace (name0[len-1]))
|
|
len -= 1;
|
|
|
|
if (name0[0] == '<' || strstr (name0, "___") != NULL)
|
|
{
|
|
strncpy (name, name0, len);
|
|
name[len] = '\000';
|
|
result.length = len;
|
|
return result;
|
|
}
|
|
|
|
i = i0 = 0;
|
|
while (i0 < len)
|
|
{
|
|
if (isalnum (name0[i0]))
|
|
{
|
|
name[i] = tolower (name0[i0]);
|
|
i += 1; i0 += 1;
|
|
}
|
|
else switch (name0[i0])
|
|
{
|
|
default:
|
|
name[i] = name0[i0];
|
|
i += 1; i0 += 1;
|
|
break;
|
|
case ' ': case '\t':
|
|
i0 += 1;
|
|
break;
|
|
case '\'':
|
|
do
|
|
{
|
|
name[i] = name0[i0];
|
|
i += 1; i0 += 1;
|
|
}
|
|
while (i0 < len && name0[i0] != '\'');
|
|
i0 += 1;
|
|
break;
|
|
}
|
|
}
|
|
name[i] = '\000';
|
|
|
|
result.length = i;
|
|
return result;
|
|
}
|
|
|
|
/* Return TEXT[0..LEN-1], a string literal without surrounding quotes,
|
|
with special hex character notations replaced with characters.
|
|
Result valid until the next call to ada_parse. */
|
|
|
|
static struct stoken
|
|
processString (const char *text, int len)
|
|
{
|
|
const char *p;
|
|
char *q;
|
|
const char *lim = text + len;
|
|
struct stoken result;
|
|
|
|
q = (char *) obstack_alloc (&temp_parse_space, len);
|
|
result.ptr = q;
|
|
p = text;
|
|
while (p < lim)
|
|
{
|
|
if (p[0] == '[' && p[1] == '"' && p+2 < lim)
|
|
{
|
|
if (p[2] == '"') /* "...["""]... */
|
|
{
|
|
*q = '"';
|
|
p += 4;
|
|
}
|
|
else
|
|
{
|
|
const char *end;
|
|
ULONGEST chr = strtoulst (p + 2, &end, 16);
|
|
if (chr > 0xff)
|
|
error (_("wide strings are not yet supported"));
|
|
*q = (char) chr;
|
|
p = end + 1;
|
|
}
|
|
}
|
|
else
|
|
*q = *p;
|
|
q += 1;
|
|
p += 1;
|
|
}
|
|
result.length = q - result.ptr;
|
|
return result;
|
|
}
|
|
|
|
/* Returns the position within STR of the '.' in a
|
|
'.{WHITE}*all' component of a dotted name, or -1 if there is none.
|
|
Note: we actually don't need this routine, since 'all' can never be an
|
|
Ada identifier. Thus, looking up foo.all or foo.all.x as a name
|
|
must fail, and will eventually be interpreted as (foo).all or
|
|
(foo).all.x. However, this does avoid an extraneous lookup. */
|
|
|
|
static int
|
|
find_dot_all (const char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; str[i] != '\000'; i++)
|
|
if (str[i] == '.')
|
|
{
|
|
int i0 = i;
|
|
|
|
do
|
|
i += 1;
|
|
while (isspace (str[i]));
|
|
|
|
if (strncasecmp (str + i, "all", 3) == 0
|
|
&& !isalnum (str[i + 3]) && str[i + 3] != '_')
|
|
return i0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* Returns non-zero iff string SUBSEQ matches a subsequence of STR, ignoring
|
|
case. */
|
|
|
|
static int
|
|
subseqMatch (const char *subseq, const char *str)
|
|
{
|
|
if (subseq[0] == '\0')
|
|
return 1;
|
|
else if (str[0] == '\0')
|
|
return 0;
|
|
else if (tolower (subseq[0]) == tolower (str[0]))
|
|
return subseqMatch (subseq+1, str+1) || subseqMatch (subseq, str+1);
|
|
else
|
|
return subseqMatch (subseq, str+1);
|
|
}
|
|
|
|
|
|
static struct { const char *name; int code; }
|
|
attributes[] = {
|
|
{ "address", TICK_ADDRESS },
|
|
{ "unchecked_access", TICK_ACCESS },
|
|
{ "unrestricted_access", TICK_ACCESS },
|
|
{ "access", TICK_ACCESS },
|
|
{ "first", TICK_FIRST },
|
|
{ "last", TICK_LAST },
|
|
{ "length", TICK_LENGTH },
|
|
{ "max", TICK_MAX },
|
|
{ "min", TICK_MIN },
|
|
{ "modulus", TICK_MODULUS },
|
|
{ "pos", TICK_POS },
|
|
{ "range", TICK_RANGE },
|
|
{ "size", TICK_SIZE },
|
|
{ "tag", TICK_TAG },
|
|
{ "val", TICK_VAL },
|
|
{ NULL, -1 }
|
|
};
|
|
|
|
/* Return the syntactic code corresponding to the attribute name or
|
|
abbreviation STR. */
|
|
|
|
static int
|
|
processAttribute (const char *str)
|
|
{
|
|
int i, k;
|
|
|
|
for (i = 0; attributes[i].code != -1; i += 1)
|
|
if (strcasecmp (str, attributes[i].name) == 0)
|
|
return attributes[i].code;
|
|
|
|
for (i = 0, k = -1; attributes[i].code != -1; i += 1)
|
|
if (subseqMatch (str, attributes[i].name))
|
|
{
|
|
if (k == -1)
|
|
k = i;
|
|
else
|
|
error (_("ambiguous attribute name: `%s'"), str);
|
|
}
|
|
if (k == -1)
|
|
error (_("unrecognized attribute: `%s'"), str);
|
|
|
|
return attributes[k].code;
|
|
}
|
|
|
|
/* Back up lexptr by yyleng and then to the rightmost occurrence of
|
|
character CH, case-folded (there must be one). WARNING: since
|
|
lexptr points to the next input character that Flex has not yet
|
|
transferred to its internal buffer, the use of this function
|
|
depends on the assumption that Flex calls YY_INPUT only when it is
|
|
logically necessary to do so (thus, there is no reading ahead
|
|
farther than needed to identify the next token.) */
|
|
|
|
static void
|
|
rewind_to_char (int ch)
|
|
{
|
|
pstate->lexptr -= yyleng;
|
|
while (toupper (*pstate->lexptr) != toupper (ch))
|
|
pstate->lexptr -= 1;
|
|
yyrestart (NULL);
|
|
}
|
|
|
|
/* Dummy definition to suppress warnings about unused static definitions. */
|
|
typedef void (*dummy_function) ();
|
|
dummy_function ada_flex_use[] =
|
|
{
|
|
(dummy_function) yyunput
|
|
};
|
|
|
|
DIAGNOSTIC_POP
|