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https://sourceware.org/git/binutils-gdb.git
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04902b0995
This patch started by adding comprehensive unit tests for enum_flags.
For the testing part, it adds:
- tests of normal expected uses of the API.
- checks that _invalid_ uses of the API would fail to compile. I.e.,
it validates that enum_flags really is a strong type, and that
incorrect mixing of enum types would be caught at compile time. It
pulls that off making use of SFINEA and C++11's decltype/constexpr.
This revealed many holes in the enum_flags API. For example, the f1
assignment below currently incorrectly fails to compile:
enum_flags<flags> f1 = FLAG1;
enum_flags<flags> f2 = FLAG2 | f1;
The unit tests also revealed that this useful use case doesn't work:
enum flag { FLAG1 = 1, FLAG2 = 2 };
enum_flags<flag> src = FLAG1;
enum_flags<flag> f1 = condition ? src : FLAG2;
It fails to compile because enum_flags<flag> and flag are convertible
to each other.
Turns out that making enum_flags be implicitly convertible to the
backing raw enum type was not a good idea.
If we make it convertible to the underlying type instead, we fix that
ternary operator use case, and, we find cases throughout the codebase
that should be using the enum_flags but were using the raw backing
enum instead. So it's a good change overall.
Also, several operators were missing.
These holes and more are plugged by this patch, by reworking how the
enum_flags operators are implemented, and making use of C++11's
feature of being able to delete methods/functions.
There are cases in gdb/compile/ where we need to call a function in a
C plugin API that expects the raw enum. To address cases like that,
this adds a "raw()" method to enum_flags. This way we can keep using
the safer enum_flags to construct the value, and then be explicit when
we need to get at the raw enum.
This makes most of the enum_flags operators constexpr. Beyond
enabling more compiler optimizations and enabling the new unit tests,
this has other advantages, like making it possible to use operator|
with enum_flags values in switch cases, where only compile-time
constants are allowed:
enum_flags<flags> f = FLAG1 | FLAG2;
switch (f)
{
case FLAG1 | FLAG2:
break;
}
Currently that fails to compile.
It also switches to a different mechanism of enabling the global
operators. The current mechanism isn't namespace friendly, the new
one is.
It also switches to C++11-style SFINAE -- instead of wrapping the
return type in a SFINAE-friently structure, we use an unnamed template
parameter. I.e., this:
template <typename enum_type,
typename = is_enum_flags_enum_type_t<enum_type>>
enum_type
operator& (enum_type e1, enum_type e2)
instead of:
template <typename enum_type>
typename enum_flags_type<enum_type>::type
operator& (enum_type e1, enum_type e2)
Note that the static_assert inside operator~() was converted to a
couple overloads (signed vs unsigned), because static_assert is too
late for SFINAE-based tests, which is important for the CHECK_VALID
unit tests.
Tested with gcc {4.8, 7.1, 9.3} and clang {5.0.2, 10.0.0}.
gdb/ChangeLog:
* Makefile.in (SELFTESTS_SRCS): Add
unittests/enum-flags-selftests.c.
* btrace.c (ftrace_update_caller, ftrace_fixup_calle): Use
btrace_function_flags instead of enum btrace_function_flag.
* compile/compile-c-types.c (convert_qualified): Use
enum_flags::raw.
* compile/compile-cplus-symbols.c (convert_one_symbol)
(convert_symbol_bmsym):
* compile/compile-cplus-types.c (compile_cplus_convert_method)
(compile_cplus_convert_struct_or_union_methods)
(compile_cplus_instance::convert_qualified_base):
* go-exp.y (parse_string_or_char): Add cast to int.
* unittests/enum-flags-selftests.c: New file.
* record-btrace.c (btrace_thread_flag_to_str): Change parameter's
type to btrace_thread_flags from btrace_thread_flag.
(record_btrace_cancel_resume, record_btrace_step_thread): Change
local's type to btrace_thread_flags from btrace_thread_flag. Add
cast in DEBUG call.
gdbsupport/ChangeLog:
* enum-flags.h: Include "traits.h".
(DEF_ENUM_FLAGS_TYPE): Declare a function instead of defining a
structure.
(enum_underlying_type): Update comment.
(namespace enum_flags_detail): New. Move struct zero_type here.
(EnumIsUnsigned, EnumIsSigned): New.
(class enum_flags): Make most methods constexpr.
(operator&=, operator|=, operator^=): Take an enum_flags instead
of an enum_type. Make rvalue ref versions deleted.
(operator enum_type()): Delete.
(operator&, operator|, operator^, operator~): Delete, moved out of
class.
(raw()): New method.
(is_enum_flags_enum_type_t): Declare.
(ENUM_FLAGS_GEN_BINOP, ENUM_FLAGS_GEN_COMPOUND_ASSIGN)
(ENUM_FLAGS_GEN_COMP): New. Use them to reimplement global
operators.
(operator~): Now constexpr and reimplemented.
(operator<<, operator>>): New deleted functions.
* valid-expr.h (CHECK_VALID_EXPR_5, CHECK_VALID_EXPR_6): New.
1584 lines
40 KiB
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1584 lines
40 KiB
Plaintext
/* YACC parser for Go expressions, for GDB.
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Copyright (C) 2012-2020 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 (ps->gdbarch ())
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/* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
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etc). */
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#define GDB_YY_REMAP_PREFIX go_
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#include "yy-remap.h"
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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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static void yyerror (const 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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gdb_byte val[16];
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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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%}
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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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{ pstate->mark_struct_expression ();
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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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pstate->mark_struct_expression ();
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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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{ pstate->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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pstate->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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{ pstate->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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{ pstate->arglist_len = 1; }
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;
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arglist : arglist ',' exp %prec ABOVE_COMMA
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{ pstate->arglist_len++; }
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;
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rcurly : '}'
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{ $$ = pstate->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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}
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;
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exp : NAME_OR_INT
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{ YYSTYPE val;
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parse_number (pstate, $1.stoken.ptr,
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$1.stoken.length, 0, &val);
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write_exp_elt_opcode (pstate, OP_LONG);
|
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write_exp_elt_type (pstate, val.typed_val_int.type);
|
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write_exp_elt_longcst (pstate, (LONGEST)
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val.typed_val_int.val);
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
}
|
||
;
|
||
|
||
|
||
exp : FLOAT
|
||
{ write_exp_elt_opcode (pstate, OP_FLOAT);
|
||
write_exp_elt_type (pstate, $1.type);
|
||
write_exp_elt_floatcst (pstate, $1.val);
|
||
write_exp_elt_opcode (pstate, OP_FLOAT); }
|
||
;
|
||
|
||
exp : variable
|
||
;
|
||
|
||
exp : DOLLAR_VARIABLE
|
||
{
|
||
write_dollar_variable (pstate, $1);
|
||
}
|
||
;
|
||
|
||
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);
|
||
$3 = 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;
|
||
$$.tokens = vec;
|
||
|
||
vec->type = $1.type;
|
||
vec->length = $1.length;
|
||
vec->ptr = (char *) malloc ($1.length + 1);
|
||
memcpy (vec->ptr, $1.ptr, $1.length + 1);
|
||
}
|
||
|
||
| string_exp '+' STRING
|
||
{
|
||
/* Note that we NUL-terminate here, but just
|
||
for convenience. */
|
||
char *p;
|
||
++$$.len;
|
||
$$.tokens = XRESIZEVEC (struct typed_stoken,
|
||
$$.tokens, $$.len);
|
||
|
||
p = (char *) malloc ($3.length + 1);
|
||
memcpy (p, $3.ptr, $3.length + 1);
|
||
|
||
$$.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.symbol;
|
||
|
||
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).c_str ());
|
||
|
||
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 block_symbol sym = $1.sym;
|
||
|
||
if (sym.symbol)
|
||
{
|
||
if (symbol_read_needs_frame (sym.symbol))
|
||
pstate->block_tracker->update (sym);
|
||
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
write_exp_elt_block (pstate, sym.block);
|
||
write_exp_elt_sym (pstate, sym.symbol);
|
||
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;
|
||
std::string arg = copy_name ($1.stoken);
|
||
|
||
msymbol =
|
||
lookup_bound_minimal_symbol (arg.c_str ());
|
||
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."),
|
||
arg.c_str ());
|
||
}
|
||
}
|
||
;
|
||
|
||
/* 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
|
||
{ $$ = builtin_go_type (pstate->gdbarch ())
|
||
->builtin_uint8; }
|
||
;
|
||
|
||
/* TODO
|
||
name : NAME { $$ = $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
|
||
*/
|
||
;
|
||
|
||
%%
|
||
|
||
/* 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)
|
||
{
|
||
const struct builtin_go_type *builtin_go_types
|
||
= builtin_go_type (par_state->gdbarch ());
|
||
|
||
/* Handle suffixes: 'f' for float32, 'l' for long double.
|
||
FIXME: This appears to be an extension -- do we want this? */
|
||
if (len >= 1 && tolower (p[len - 1]) == 'f')
|
||
{
|
||
putithere->typed_val_float.type
|
||
= builtin_go_types->builtin_float32;
|
||
len--;
|
||
}
|
||
else if (len >= 1 && tolower (p[len - 1]) == 'l')
|
||
{
|
||
putithere->typed_val_float.type
|
||
= parse_type (par_state)->builtin_long_double;
|
||
len--;
|
||
}
|
||
/* Default type for floating-point literals is float64. */
|
||
else
|
||
{
|
||
putithere->typed_val_float.type
|
||
= builtin_go_types->builtin_float64;
|
||
}
|
||
|
||
if (!parse_float (p, len,
|
||
putithere->typed_val_float.type,
|
||
putithere->typed_val_float.val))
|
||
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 (par_state->gdbarch ()) - 2)) == 0)
|
||
{
|
||
high_bit
|
||
= ((ULONGEST)1) << (gdbarch_int_bit (par_state->gdbarch ()) - 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 (par_state->gdbarch ()) - 2)) == 0)
|
||
{
|
||
high_bit
|
||
= ((ULONGEST)1) << (gdbarch_long_bit (par_state->gdbarch ()) - 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 (par_state->gdbarch ()))
|
||
/* A long long does not fit in a LONGEST. */
|
||
shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
|
||
else
|
||
shift = (gdbarch_long_long_bit (par_state->gdbarch ()) - 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 = (int) C_STRING | (quote == '\'' ? C_CHAR : 0); /*FIXME*/
|
||
value->ptr = (char *) obstack_base (&tempbuf);
|
||
value->length = obstack_object_size (&tempbuf);
|
||
|
||
*outptr = tokptr;
|
||
|
||
return quote == '\'' ? CHAR : STRING;
|
||
}
|
||
|
||
struct token
|
||
{
|
||
const char *oper;
|
||
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;
|
||
|
||
/* Depth of parentheses. */
|
||
static int paren_depth;
|
||
|
||
/* 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;
|
||
|
||
last_was_structop = 0;
|
||
|
||
retry:
|
||
|
||
par_state->prev_lexptr = par_state->lexptr;
|
||
|
||
tokstart = par_state->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].oper, 3) == 0)
|
||
{
|
||
par_state->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].oper, 2) == 0)
|
||
{
|
||
par_state->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':
|
||
par_state->lexptr++;
|
||
goto retry;
|
||
|
||
case '[':
|
||
case '(':
|
||
paren_depth++;
|
||
par_state->lexptr++;
|
||
return c;
|
||
|
||
case ']':
|
||
case ')':
|
||
if (paren_depth == 0)
|
||
return 0;
|
||
paren_depth--;
|
||
par_state->lexptr++;
|
||
return c;
|
||
|
||
case ',':
|
||
if (pstate->comma_terminates
|
||
&& paren_depth == 0)
|
||
return 0;
|
||
par_state->lexptr++;
|
||
return c;
|
||
|
||
case '.':
|
||
/* Might be a floating point number. */
|
||
if (par_state->lexptr[1] < '0' || par_state->lexptr[1] > '9')
|
||
{
|
||
if (pstate->parse_completion)
|
||
last_was_structop = 1;
|
||
goto symbol; /* Nope, must be a symbol. */
|
||
}
|
||
/* FALL THRU. */
|
||
|
||
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);
|
||
}
|
||
par_state->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] != '_')
|
||
{
|
||
par_state->lexptr = &p[len];
|
||
return ENTRY;
|
||
}
|
||
}
|
||
/* FALLTHRU */
|
||
case '+':
|
||
case '-':
|
||
case '*':
|
||
case '/':
|
||
case '%':
|
||
case '|':
|
||
case '&':
|
||
case '^':
|
||
case '~':
|
||
case '!':
|
||
case '<':
|
||
case '>':
|
||
case '?':
|
||
case ':':
|
||
case '=':
|
||
case '{':
|
||
case '}':
|
||
symbol:
|
||
par_state->lexptr++;
|
||
return c;
|
||
|
||
case '\'':
|
||
case '"':
|
||
case '`':
|
||
{
|
||
int host_len;
|
||
int result = parse_string_or_char (tokstart, &par_state->lexptr,
|
||
&yylval.tsval, &host_len);
|
||
if (result == CHAR)
|
||
{
|
||
if (host_len == 0)
|
||
error (_("Empty character constant."));
|
||
else if (host_len > 2 && c == '\'')
|
||
{
|
||
++tokstart;
|
||
namelen = par_state->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 == '$' || (c >= '0' && c <= '9')
|
||
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));)
|
||
{
|
||
c = tokstart[++namelen];
|
||
}
|
||
|
||
/* The token "if" terminates the expression and is NOT removed from
|
||
the input stream. It doesn't count if it appears in the
|
||
expansion of a macro. */
|
||
if (namelen == 2
|
||
&& tokstart[0] == 'i'
|
||
&& tokstart[1] == 'f')
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* For the same reason (breakpoint conditions), "thread N"
|
||
terminates the expression. "thread" could be an identifier, but
|
||
an identifier is never followed by a number without intervening
|
||
punctuation.
|
||
Handle abbreviations of these, similarly to
|
||
breakpoint.c:find_condition_and_thread.
|
||
TODO: Watch for "goroutine" here? */
|
||
if (namelen >= 1
|
||
&& strncmp (tokstart, "thread", namelen) == 0
|
||
&& (tokstart[namelen] == ' ' || tokstart[namelen] == '\t'))
|
||
{
|
||
const char *p = tokstart + namelen + 1;
|
||
|
||
while (*p == ' ' || *p == '\t')
|
||
p++;
|
||
if (*p >= '0' && *p <= '9')
|
||
return 0;
|
||
}
|
||
|
||
par_state->lexptr += namelen;
|
||
|
||
tryname:
|
||
|
||
yylval.sval.ptr = tokstart;
|
||
yylval.sval.length = namelen;
|
||
|
||
/* Catch specific keywords. */
|
||
std::string copy = copy_name (yylval.sval);
|
||
for (i = 0; i < sizeof (ident_tokens) / sizeof (ident_tokens[0]); i++)
|
||
if (copy == ident_tokens[i].oper)
|
||
{
|
||
/* It is ok to always set this, even though we don't always
|
||
strictly need to. */
|
||
yylval.opcode = ident_tokens[i].opcode;
|
||
return ident_tokens[i].token;
|
||
}
|
||
|
||
if (*tokstart == '$')
|
||
return DOLLAR_VARIABLE;
|
||
|
||
if (pstate->parse_completion && *par_state->lexptr == '\0')
|
||
saw_name_at_eof = 1;
|
||
return NAME;
|
||
}
|
||
|
||
/* An object of this type is pushed on a FIFO by the "outer" lexer. */
|
||
struct token_and_value
|
||
{
|
||
int token;
|
||
YYSTYPE value;
|
||
};
|
||
|
||
/* A FIFO of tokens that have been read but not yet returned to the
|
||
parser. */
|
||
static std::vector<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 auto_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;
|
||
|
||
name_obstack.clear ();
|
||
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 = (char *) 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).symbol;
|
||
|
||
if (sym
|
||
&& SYMBOL_CLASS (sym) == LOC_TYPEDEF
|
||
&& SYMBOL_TYPE (sym)->code () == 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)
|
||
{
|
||
std::string copy = copy_name (function_name);
|
||
|
||
if (copy == "Sizeof")
|
||
{
|
||
yylval.sval = function_name;
|
||
return SIZEOF_KEYWORD;
|
||
}
|
||
|
||
error (_("Unknown function in `unsafe' package: %s"), copy.c_str ());
|
||
}
|
||
|
||
/* 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)
|
||
{
|
||
struct block_symbol sym;
|
||
struct field_of_this_result is_a_field_of_this;
|
||
|
||
std::string copy = copy_name (yylval.sval);
|
||
|
||
sym = lookup_symbol (copy.c_str (), block, VAR_DOMAIN, &is_a_field_of_this);
|
||
|
||
if (sym.symbol)
|
||
{
|
||
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 block_symbol sym;
|
||
struct field_of_this_result is_a_field_of_this;
|
||
|
||
std::string copy = copy_name (yylval.sval);
|
||
|
||
/* Try primitive types first so they win over bad/weird debug info. */
|
||
type = language_lookup_primitive_type (par_state->language (),
|
||
par_state->gdbarch (),
|
||
copy.c_str ());
|
||
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.c_str (), block, VAR_DOMAIN, &is_a_field_of_this);
|
||
|
||
if (sym.symbol)
|
||
{
|
||
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.c_str (), copy.size ());
|
||
|
||
xfree (current_package_name);
|
||
sym = lookup_symbol (sval.ptr, block, VAR_DOMAIN,
|
||
&is_a_field_of_this);
|
||
if (sym.symbol)
|
||
{
|
||
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.c_str (),
|
||
yylval.sval.length, 0, &newlval);
|
||
if (hextype == INT)
|
||
{
|
||
yylval.ssym.sym.symbol = NULL;
|
||
yylval.ssym.sym.block = NULL;
|
||
yylval.ssym.is_a_field_of_this = 0;
|
||
return NAME_OR_INT;
|
||
}
|
||
}
|
||
|
||
yylval.ssym.sym.symbol = NULL;
|
||
yylval.ssym.sym.block = 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 && !token_fifo.empty ())
|
||
{
|
||
token_and_value tv = token_fifo[0];
|
||
token_fifo.erase (token_fifo.begin ());
|
||
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". */
|
||
std::string copy = copy_name (current.value.sval);
|
||
|
||
if (copy == "unsafe")
|
||
{
|
||
popping = 1;
|
||
return classify_unsafe_function (name2.value.sval);
|
||
}
|
||
|
||
if (package_name_p (copy.c_str (), pstate->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 (pstate->expression_context_block);
|
||
}
|
||
}
|
||
|
||
token_fifo.push_back (next);
|
||
token_fifo.push_back (name2);
|
||
}
|
||
else
|
||
token_fifo.push_back (next);
|
||
|
||
/* If we arrive here we don't have a package-qualified name. */
|
||
|
||
popping = 1;
|
||
yylval = current.value;
|
||
return classify_name (pstate, pstate->expression_context_block);
|
||
}
|
||
|
||
int
|
||
go_parse (struct parser_state *par_state)
|
||
{
|
||
/* Setting up the parser state. */
|
||
scoped_restore pstate_restore = make_scoped_restore (&pstate);
|
||
gdb_assert (par_state != NULL);
|
||
pstate = par_state;
|
||
|
||
scoped_restore restore_yydebug = make_scoped_restore (&yydebug,
|
||
parser_debug);
|
||
|
||
/* Initialize some state used by the lexer. */
|
||
last_was_structop = 0;
|
||
saw_name_at_eof = 0;
|
||
paren_depth = 0;
|
||
|
||
token_fifo.clear ();
|
||
popping = 0;
|
||
name_obstack.clear ();
|
||
|
||
return yyparse ();
|
||
}
|
||
|
||
static void
|
||
yyerror (const char *msg)
|
||
{
|
||
if (pstate->prev_lexptr)
|
||
pstate->lexptr = pstate->prev_lexptr;
|
||
|
||
error (_("A %s in expression, near `%s'."), msg, pstate->lexptr);
|
||
}
|