/* Parse expressions for GDB.
- Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+
+ Copyright (C) 1986-2020 Free Software Foundation, Inc.
+
Modified from expread.y by the Department of Computer Science at the
State University of New York at Buffalo, 1991.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Parse an expression from text in a string,
- and return the result as a struct expression pointer.
+ and return the result as a struct expression pointer.
That structure contains arithmetic operations in reverse polish,
with constants represented by operations that are followed by special data.
See expression.h for the details of the format.
during the process of parsing; the lower levels of the tree always
come first in the result. */
-#include <ctype.h>
-
#include "defs.h"
-#include "gdb_string.h"
+#include <ctype.h>
+#include "arch-utils.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "frame.h"
#include "value.h"
#include "command.h"
#include "language.h"
+#include "f-lang.h"
#include "parser-defs.h"
#include "gdbcmd.h"
#include "symfile.h" /* for overlay functions */
-#include "inferior.h" /* for NUM_PSEUDO_REGS. NOTE: replace
- with "gdbarch.h" when appropriate. */
-#include "doublest.h"
-#include "gdb_assert.h"
-
-\f
-/* Symbols which architectures can redefine. */
-
-/* Some systems have routines whose names start with `$'. Giving this
- macro a non-zero value tells GDB's expression parser to check for
- such routines when parsing tokens that begin with `$'.
-
- On HP-UX, certain system routines (millicode) have names beginning
- with `$' or `$$'. For example, `$$dyncall' is a millicode routine
- that handles inter-space procedure calls on PA-RISC. */
-#ifndef SYMBOLS_CAN_START_WITH_DOLLAR
-#define SYMBOLS_CAN_START_WITH_DOLLAR (0)
-#endif
-
-
-\f
-/* Global variables declared in parser-defs.h (and commented there). */
-struct expression *expout;
-int expout_size;
-int expout_ptr;
-struct block *expression_context_block;
-CORE_ADDR expression_context_pc;
-struct block *innermost_block;
-int arglist_len;
-union type_stack_elt *type_stack;
-int type_stack_depth, type_stack_size;
-char *lexptr;
-char *prev_lexptr;
-char *namecopy;
-int paren_depth;
-int comma_terminates;
+#include "inferior.h"
+#include "target-float.h"
+#include "block.h"
+#include "source.h"
+#include "objfiles.h"
+#include "user-regs.h"
+#include <algorithm>
+#include "gdbsupport/gdb_optional.h"
+
+/* Standard set of definitions for printing, dumping, prefixifying,
+ * and evaluating expressions. */
+
+const struct exp_descriptor exp_descriptor_standard =
+ {
+ print_subexp_standard,
+ operator_length_standard,
+ operator_check_standard,
+ op_name_standard,
+ dump_subexp_body_standard,
+ evaluate_subexp_standard
+ };
\f
-static int expressiondebug = 0;
-
-extern int hp_som_som_object_present;
+static unsigned int expressiondebug = 0;
+static void
+show_expressiondebug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Expression debugging is %s.\n"), value);
+}
-static void free_funcalls (void *ignore);
-static void prefixify_expression (struct expression *);
+/* True if an expression parser should set yydebug. */
+bool parser_debug;
static void
-prefixify_subexp (struct expression *, struct expression *, int, int);
+show_parserdebug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Parser debugging is %s.\n"), value);
+}
-void _initialize_parse (void);
-/* Data structure for saving values of arglist_len for function calls whose
- arguments contain other function calls. */
+static int prefixify_subexp (struct expression *, struct expression *, int,
+ int, int);
-struct funcall
- {
- struct funcall *next;
- int arglist_len;
- };
+static expression_up parse_exp_in_context (const char **, CORE_ADDR,
+ const struct block *, int,
+ int, int *,
+ innermost_block_tracker *,
+ expr_completion_state *);
-static struct funcall *funcall_chain;
+static void increase_expout_size (struct expr_builder *ps, size_t lenelt);
-/* Begin counting arguments for a function call,
- saving the data about any containing call. */
+
+/* Documented at it's declaration. */
void
-start_arglist (void)
+innermost_block_tracker::update (const struct block *b,
+ innermost_block_tracker_types t)
{
- register struct funcall *new;
-
- new = (struct funcall *) xmalloc (sizeof (struct funcall));
- new->next = funcall_chain;
- new->arglist_len = arglist_len;
- arglist_len = 0;
- funcall_chain = new;
+ if ((m_types & t) != 0
+ && (m_innermost_block == NULL
+ || contained_in (b, m_innermost_block)))
+ m_innermost_block = b;
}
-/* Return the number of arguments in a function call just terminated,
- and restore the data for the containing function call. */
+\f
-int
-end_arglist (void)
+/* See definition in parser-defs.h. */
+
+expr_builder::expr_builder (const struct language_defn *lang,
+ struct gdbarch *gdbarch)
+ : expout_size (10),
+ expout (XNEWVAR (expression,
+ (sizeof (expression)
+ + EXP_ELEM_TO_BYTES (expout_size)))),
+ expout_ptr (0)
{
- register int val = arglist_len;
- register struct funcall *call = funcall_chain;
- funcall_chain = call->next;
- arglist_len = call->arglist_len;
- xfree (call);
- return val;
+ expout->language_defn = lang;
+ expout->gdbarch = gdbarch;
}
-/* Free everything in the funcall chain.
- Used when there is an error inside parsing. */
-
-static void
-free_funcalls (void *ignore)
+expression_up
+expr_builder::release ()
{
- register struct funcall *call, *next;
+ /* Record the actual number of expression elements, and then
+ reallocate the expression memory so that we free up any
+ excess elements. */
- for (call = funcall_chain; call; call = next)
- {
- next = call->next;
- xfree (call);
- }
+ expout->nelts = expout_ptr;
+ expout.reset (XRESIZEVAR (expression, expout.release (),
+ (sizeof (expression)
+ + EXP_ELEM_TO_BYTES (expout_ptr))));
+
+ return std::move (expout);
}
-\f
-/* This page contains the functions for adding data to the struct expression
+
+/* This page contains the functions for adding data to the struct expression
being constructed. */
/* Add one element to the end of the expression. */
/* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
- a register through here */
+ a register through here. */
-void
-write_exp_elt (union exp_element expelt)
+static void
+write_exp_elt (struct expr_builder *ps, const union exp_element *expelt)
{
- if (expout_ptr >= expout_size)
+ if (ps->expout_ptr >= ps->expout_size)
{
- expout_size *= 2;
- expout = (struct expression *)
- xrealloc ((char *) expout, sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (expout_size));
+ ps->expout_size *= 2;
+ ps->expout.reset (XRESIZEVAR (expression, ps->expout.release (),
+ (sizeof (expression)
+ + EXP_ELEM_TO_BYTES (ps->expout_size))));
}
- expout->elts[expout_ptr++] = expelt;
+ ps->expout->elts[ps->expout_ptr++] = *expelt;
}
void
-write_exp_elt_opcode (enum exp_opcode expelt)
+write_exp_elt_opcode (struct expr_builder *ps, enum exp_opcode expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.opcode = expelt;
-
- write_exp_elt (tmp);
+ write_exp_elt (ps, &tmp);
}
void
-write_exp_elt_sym (struct symbol *expelt)
+write_exp_elt_sym (struct expr_builder *ps, struct symbol *expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.symbol = expelt;
+ write_exp_elt (ps, &tmp);
+}
- write_exp_elt (tmp);
+static void
+write_exp_elt_msym (struct expr_builder *ps, minimal_symbol *expelt)
+{
+ union exp_element tmp;
+
+ memset (&tmp, 0, sizeof (union exp_element));
+ tmp.msymbol = expelt;
+ write_exp_elt (ps, &tmp);
}
void
-write_exp_elt_block (struct block *b)
+write_exp_elt_block (struct expr_builder *ps, const struct block *b)
{
union exp_element tmp;
+
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.block = b;
- write_exp_elt (tmp);
+ write_exp_elt (ps, &tmp);
}
void
-write_exp_elt_longcst (LONGEST expelt)
+write_exp_elt_objfile (struct expr_builder *ps, struct objfile *objfile)
{
union exp_element tmp;
- tmp.longconst = expelt;
+ memset (&tmp, 0, sizeof (union exp_element));
+ tmp.objfile = objfile;
+ write_exp_elt (ps, &tmp);
+}
+
+void
+write_exp_elt_longcst (struct expr_builder *ps, LONGEST expelt)
+{
+ union exp_element tmp;
- write_exp_elt (tmp);
+ memset (&tmp, 0, sizeof (union exp_element));
+ tmp.longconst = expelt;
+ write_exp_elt (ps, &tmp);
}
void
-write_exp_elt_dblcst (DOUBLEST expelt)
+write_exp_elt_floatcst (struct expr_builder *ps, const gdb_byte expelt[16])
{
union exp_element tmp;
+ int index;
- tmp.doubleconst = expelt;
+ for (index = 0; index < 16; index++)
+ tmp.floatconst[index] = expelt[index];
- write_exp_elt (tmp);
+ write_exp_elt (ps, &tmp);
}
void
-write_exp_elt_type (struct type *expelt)
+write_exp_elt_type (struct expr_builder *ps, struct type *expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.type = expelt;
-
- write_exp_elt (tmp);
+ write_exp_elt (ps, &tmp);
}
void
-write_exp_elt_intern (struct internalvar *expelt)
+write_exp_elt_intern (struct expr_builder *ps, struct internalvar *expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.internalvar = expelt;
-
- write_exp_elt (tmp);
+ write_exp_elt (ps, &tmp);
}
/* Add a string constant to the end of the expression.
that contains the length of the string, then stuffing the string
constant itself into however many expression elements are needed
to hold it, and then writing another expression element that contains
- the length of the string. I.E. an expression element at each end of
+ the length of the string. I.e. an expression element at each end of
the string records the string length, so you can skip over the
expression elements containing the actual string bytes from either
end of the string. Note that this also allows gdb to handle
strings with embedded null bytes, as is required for some languages.
Don't be fooled by the fact that the string is null byte terminated,
- this is strictly for the convenience of debugging gdb itself. Gdb
+ this is strictly for the convenience of debugging gdb itself.
Gdb does not depend up the string being null terminated, since the
actual length is recorded in expression elements at each end of the
string. The null byte is taken into consideration when computing how
many expression elements are required to hold the string constant, of
- course. */
+ course. */
void
-write_exp_string (struct stoken str)
+write_exp_string (struct expr_builder *ps, struct stoken str)
{
- register int len = str.length;
- register int lenelt;
- register char *strdata;
+ int len = str.length;
+ size_t lenelt;
+ char *strdata;
/* Compute the number of expression elements required to hold the string
(including a null byte terminator), along with one expression element
at each end to record the actual string length (not including the
- null byte terminator). */
+ null byte terminator). */
lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1);
- /* Ensure that we have enough available expression elements to store
- everything. */
-
- if ((expout_ptr + lenelt) >= expout_size)
- {
- expout_size = max (expout_size * 2, expout_ptr + lenelt + 10);
- expout = (struct expression *)
- xrealloc ((char *) expout, (sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (expout_size)));
- }
+ increase_expout_size (ps, lenelt);
/* Write the leading length expression element (which advances the current
expression element index), then write the string constant followed by a
terminating null byte, and then write the trailing length expression
- element. */
+ element. */
- write_exp_elt_longcst ((LONGEST) len);
- strdata = (char *) &expout->elts[expout_ptr];
+ write_exp_elt_longcst (ps, (LONGEST) len);
+ strdata = (char *) &ps->expout->elts[ps->expout_ptr];
memcpy (strdata, str.ptr, len);
*(strdata + len) = '\0';
- expout_ptr += lenelt - 2;
- write_exp_elt_longcst ((LONGEST) len);
+ ps->expout_ptr += lenelt - 2;
+ write_exp_elt_longcst (ps, (LONGEST) len);
+}
+
+/* Add a vector of string constants to the end of the expression.
+
+ This adds an OP_STRING operation, but encodes the contents
+ differently from write_exp_string. The language is expected to
+ handle evaluation of this expression itself.
+
+ After the usual OP_STRING header, TYPE is written into the
+ expression as a long constant. The interpretation of this field is
+ up to the language evaluator.
+
+ Next, each string in VEC is written. The length is written as a
+ long constant, followed by the contents of the string. */
+
+void
+write_exp_string_vector (struct expr_builder *ps, int type,
+ struct stoken_vector *vec)
+{
+ int i, len;
+ size_t n_slots;
+
+ /* Compute the size. We compute the size in number of slots to
+ avoid issues with string padding. */
+ n_slots = 0;
+ for (i = 0; i < vec->len; ++i)
+ {
+ /* One slot for the length of this element, plus the number of
+ slots needed for this string. */
+ n_slots += 1 + BYTES_TO_EXP_ELEM (vec->tokens[i].length);
+ }
+
+ /* One more slot for the type of the string. */
+ ++n_slots;
+
+ /* Now compute a phony string length. */
+ len = EXP_ELEM_TO_BYTES (n_slots) - 1;
+
+ n_slots += 4;
+ increase_expout_size (ps, n_slots);
+
+ write_exp_elt_opcode (ps, OP_STRING);
+ write_exp_elt_longcst (ps, len);
+ write_exp_elt_longcst (ps, type);
+
+ for (i = 0; i < vec->len; ++i)
+ {
+ write_exp_elt_longcst (ps, vec->tokens[i].length);
+ memcpy (&ps->expout->elts[ps->expout_ptr], vec->tokens[i].ptr,
+ vec->tokens[i].length);
+ ps->expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length);
+ }
+
+ write_exp_elt_longcst (ps, len);
+ write_exp_elt_opcode (ps, OP_STRING);
}
/* Add a bitstring constant to the end of the expression.
that contains the length of the bitstring (in bits), then stuffing the
bitstring constant itself into however many expression elements are
needed to hold it, and then writing another expression element that
- contains the length of the bitstring. I.E. an expression element at
+ contains the length of the bitstring. I.e. an expression element at
each end of the bitstring records the bitstring length, so you can skip
over the expression elements containing the actual bitstring bytes from
- either end of the bitstring. */
+ either end of the bitstring. */
void
-write_exp_bitstring (struct stoken str)
+write_exp_bitstring (struct expr_builder *ps, struct stoken str)
{
- register int bits = str.length; /* length in bits */
- register int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
- register int lenelt;
- register char *strdata;
+ int bits = str.length; /* length in bits */
+ int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
+ size_t lenelt;
+ char *strdata;
/* Compute the number of expression elements required to hold the bitstring,
along with one expression element at each end to record the actual
- bitstring length in bits. */
+ bitstring length in bits. */
lenelt = 2 + BYTES_TO_EXP_ELEM (len);
- /* Ensure that we have enough available expression elements to store
- everything. */
-
- if ((expout_ptr + lenelt) >= expout_size)
- {
- expout_size = max (expout_size * 2, expout_ptr + lenelt + 10);
- expout = (struct expression *)
- xrealloc ((char *) expout, (sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (expout_size)));
- }
+ increase_expout_size (ps, lenelt);
/* Write the leading length expression element (which advances the current
expression element index), then write the bitstring constant, and then
- write the trailing length expression element. */
+ write the trailing length expression element. */
- write_exp_elt_longcst ((LONGEST) bits);
- strdata = (char *) &expout->elts[expout_ptr];
+ write_exp_elt_longcst (ps, (LONGEST) bits);
+ strdata = (char *) &ps->expout->elts[ps->expout_ptr];
memcpy (strdata, str.ptr, len);
- expout_ptr += lenelt - 2;
- write_exp_elt_longcst ((LONGEST) bits);
+ ps->expout_ptr += lenelt - 2;
+ write_exp_elt_longcst (ps, (LONGEST) bits);
}
-/* Add the appropriate elements for a minimal symbol to the end of
- the expression. The rationale behind passing in text_symbol_type and
- data_symbol_type was so that Modula-2 could pass in WORD for
- data_symbol_type. Perhaps it still is useful to have those types vary
- based on the language, but they no longer have names like "int", so
- the initial rationale is gone. */
-
-static struct type *msym_text_symbol_type;
-static struct type *msym_data_symbol_type;
-static struct type *msym_unknown_symbol_type;
+/* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
+ ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
+ address. */
-void
-write_exp_msymbol (struct minimal_symbol *msymbol,
- struct type *text_symbol_type,
- struct type *data_symbol_type)
+type *
+find_minsym_type_and_address (minimal_symbol *msymbol,
+ struct objfile *objfile,
+ CORE_ADDR *address_p)
{
- CORE_ADDR addr;
+ bound_minimal_symbol bound_msym = {msymbol, objfile};
+ struct obj_section *section = MSYMBOL_OBJ_SECTION (objfile, msymbol);
+ enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol);
- write_exp_elt_opcode (OP_LONG);
- /* Let's make the type big enough to hold a 64-bit address. */
- write_exp_elt_type (builtin_type_CORE_ADDR);
+ bool is_tls = (section != NULL
+ && section->the_bfd_section->flags & SEC_THREAD_LOCAL);
+
+ /* The minimal symbol might point to a function descriptor;
+ resolve it to the actual code address instead. */
+ CORE_ADDR addr;
+ if (is_tls)
+ {
+ /* Addresses of TLS symbols are really offsets into a
+ per-objfile/per-thread storage block. */
+ addr = MSYMBOL_VALUE_RAW_ADDRESS (bound_msym.minsym);
+ }
+ else if (msymbol_is_function (objfile, msymbol, &addr))
+ {
+ if (addr != BMSYMBOL_VALUE_ADDRESS (bound_msym))
+ {
+ /* This means we resolved a function descriptor, and we now
+ have an address for a code/text symbol instead of a data
+ symbol. */
+ if (MSYMBOL_TYPE (msymbol) == mst_data_gnu_ifunc)
+ type = mst_text_gnu_ifunc;
+ else
+ type = mst_text;
+ section = NULL;
+ }
+ }
+ else
+ addr = BMSYMBOL_VALUE_ADDRESS (bound_msym);
- addr = SYMBOL_VALUE_ADDRESS (msymbol);
if (overlay_debugging)
- addr = symbol_overlayed_address (addr, SYMBOL_BFD_SECTION (msymbol));
- write_exp_elt_longcst ((LONGEST) addr);
+ addr = symbol_overlayed_address (addr, section);
+
+ if (is_tls)
+ {
+ /* Skip translation if caller does not need the address. */
+ if (address_p != NULL)
+ *address_p = target_translate_tls_address (objfile, addr);
+ return objfile_type (objfile)->nodebug_tls_symbol;
+ }
- write_exp_elt_opcode (OP_LONG);
+ if (address_p != NULL)
+ *address_p = addr;
- write_exp_elt_opcode (UNOP_MEMVAL);
- switch (msymbol->type)
+ switch (type)
{
case mst_text:
case mst_file_text:
case mst_solib_trampoline:
- write_exp_elt_type (msym_text_symbol_type);
- break;
+ return objfile_type (objfile)->nodebug_text_symbol;
+
+ case mst_text_gnu_ifunc:
+ return objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol;
case mst_data:
case mst_file_data:
case mst_bss:
case mst_file_bss:
- write_exp_elt_type (msym_data_symbol_type);
- break;
+ return objfile_type (objfile)->nodebug_data_symbol;
+
+ case mst_slot_got_plt:
+ return objfile_type (objfile)->nodebug_got_plt_symbol;
default:
- write_exp_elt_type (msym_unknown_symbol_type);
- break;
+ return objfile_type (objfile)->nodebug_unknown_symbol;
}
- write_exp_elt_opcode (UNOP_MEMVAL);
}
+
+/* Add the appropriate elements for a minimal symbol to the end of
+ the expression. */
+
+void
+write_exp_msymbol (struct expr_builder *ps,
+ struct bound_minimal_symbol bound_msym)
+{
+ write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE);
+ write_exp_elt_objfile (ps, bound_msym.objfile);
+ write_exp_elt_msym (ps, bound_msym.minsym);
+ write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE);
+}
+
+/* See parser-defs.h. */
+
+void
+parser_state::mark_struct_expression ()
+{
+ gdb_assert (parse_completion
+ && (m_completion_state.expout_tag_completion_type
+ == TYPE_CODE_UNDEF));
+ m_completion_state.expout_last_struct = expout_ptr;
+}
+
+/* Indicate that the current parser invocation is completing a tag.
+ TAG is the type code of the tag, and PTR and LENGTH represent the
+ start of the tag name. */
+
+void
+parser_state::mark_completion_tag (enum type_code tag, const char *ptr,
+ int length)
+{
+ gdb_assert (parse_completion
+ && (m_completion_state.expout_tag_completion_type
+ == TYPE_CODE_UNDEF)
+ && m_completion_state.expout_completion_name == NULL
+ && m_completion_state.expout_last_struct == -1);
+ gdb_assert (tag == TYPE_CODE_UNION
+ || tag == TYPE_CODE_STRUCT
+ || tag == TYPE_CODE_ENUM);
+ m_completion_state.expout_tag_completion_type = tag;
+ m_completion_state.expout_completion_name.reset (xstrndup (ptr, length));
+}
+
\f
/* Recognize tokens that start with '$'. These include:
from the first value which has index 1.
$$digits Value history with index <digits> relative
- to the last value. I.E. $$0 is the last
+ to the last value. I.e. $$0 is the last
value, $$1 is the one previous to that, $$2
is the one previous to $$1, etc.
$ | $0 | $$0 The last value in the value history.
$$ An abbreviation for the second to the last
- value in the value history, I.E. $$1
-
- */
+ value in the value history, I.e. $$1 */
void
-write_dollar_variable (struct stoken str)
+write_dollar_variable (struct parser_state *ps, struct stoken str)
{
+ struct block_symbol sym;
+ struct bound_minimal_symbol msym;
+ struct internalvar *isym = NULL;
+ std::string copy;
+
/* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
- and $$digits (equivalent to $<-digits> if you could type that). */
+ and $$digits (equivalent to $<-digits> if you could type that). */
int negate = 0;
int i = 1;
}
if (i == str.length)
{
- /* Just dollars (one or two) */
+ /* Just dollars (one or two). */
i = -negate;
goto handle_last;
}
/* Handle tokens that refer to machine registers:
$ followed by a register name. */
- i = frame_map_name_to_regnum (str.ptr + 1, str.length - 1);
+ i = user_reg_map_name_to_regnum (ps->gdbarch (),
+ str.ptr + 1, str.length - 1);
if (i >= 0)
goto handle_register;
- if (SYMBOLS_CAN_START_WITH_DOLLAR)
- {
- struct symbol *sym = NULL;
- struct minimal_symbol *msym = NULL;
+ /* Any names starting with $ are probably debugger internal variables. */
- /* On HP-UX, certain system routines (millicode) have names beginning
- with $ or $$, e.g. $$dyncall, which handles inter-space procedure
- calls on PA-RISC. Check for those, first. */
+ copy = copy_name (str);
+ isym = lookup_only_internalvar (copy.c_str () + 1);
+ if (isym)
+ {
+ write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ write_exp_elt_intern (ps, isym);
+ write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ return;
+ }
- /* This code is not enabled on non HP-UX systems, since worst case
- symbol table lookup performance is awful, to put it mildly. */
+ /* On some systems, such as HP-UX and hppa-linux, certain system routines
+ have names beginning with $ or $$. Check for those, first. */
- sym = lookup_symbol (copy_name (str), (struct block *) NULL,
- VAR_NAMESPACE, (int *) NULL, (struct symtab **) NULL);
- if (sym)
- {
- write_exp_elt_opcode (OP_VAR_VALUE);
- write_exp_elt_block (block_found); /* set by lookup_symbol */
- write_exp_elt_sym (sym);
- write_exp_elt_opcode (OP_VAR_VALUE);
- return;
- }
- msym = lookup_minimal_symbol (copy_name (str), NULL, NULL);
- if (msym)
- {
- write_exp_msymbol (msym,
- lookup_function_type (builtin_type_int),
- builtin_type_int);
- return;
- }
+ sym = lookup_symbol (copy.c_str (), NULL, VAR_DOMAIN, NULL);
+ if (sym.symbol)
+ {
+ write_exp_elt_opcode (ps, OP_VAR_VALUE);
+ write_exp_elt_block (ps, sym.block);
+ write_exp_elt_sym (ps, sym.symbol);
+ write_exp_elt_opcode (ps, OP_VAR_VALUE);
+ return;
+ }
+ msym = lookup_bound_minimal_symbol (copy.c_str ());
+ if (msym.minsym)
+ {
+ write_exp_msymbol (ps, msym);
+ return;
}
- /* Any other names starting in $ are debugger internal variables. */
+ /* Any other names are assumed to be debugger internal variables. */
- write_exp_elt_opcode (OP_INTERNALVAR);
- write_exp_elt_intern (lookup_internalvar (copy_name (str) + 1));
- write_exp_elt_opcode (OP_INTERNALVAR);
+ write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ write_exp_elt_intern (ps, create_internalvar (copy.c_str () + 1));
+ write_exp_elt_opcode (ps, OP_INTERNALVAR);
return;
handle_last:
- write_exp_elt_opcode (OP_LAST);
- write_exp_elt_longcst ((LONGEST) i);
- write_exp_elt_opcode (OP_LAST);
+ write_exp_elt_opcode (ps, OP_LAST);
+ write_exp_elt_longcst (ps, (LONGEST) i);
+ write_exp_elt_opcode (ps, OP_LAST);
return;
handle_register:
- write_exp_elt_opcode (OP_REGISTER);
- write_exp_elt_longcst (i);
- write_exp_elt_opcode (OP_REGISTER);
+ write_exp_elt_opcode (ps, OP_REGISTER);
+ str.length--;
+ str.ptr++;
+ write_exp_string (ps, str);
+ write_exp_elt_opcode (ps, OP_REGISTER);
+ ps->block_tracker->update (ps->expression_context_block,
+ INNERMOST_BLOCK_FOR_REGISTERS);
return;
}
-/* Parse a string that is possibly a namespace / nested class
- specification, i.e., something of the form A::B::C::x. Input
- (NAME) is the entire string; LEN is the current valid length; the
- output is a string, TOKEN, which points to the largest recognized
- prefix which is a series of namespaces or classes. CLASS_PREFIX is
- another output, which records whether a nested class spec was
- recognized (= 1) or a fully qualified variable name was found (=
- 0). ARGPTR is side-effected (if non-NULL) to point to beyond the
- string recognized and consumed by this routine.
-
- The return value is a pointer to the symbol for the base class or
- variable if found, or NULL if not found. Callers must check this
- first -- if NULL, the outputs may not be correct.
-
- This function is used c-exp.y. This is used specifically to get
- around HP aCC (and possibly other compilers), which insists on
- generating names with embedded colons for namespace or nested class
- members.
-
- (Argument LEN is currently unused. 1997-08-27)
-
- Callers must free memory allocated for the output string TOKEN. */
-
-static const char coloncolon[2] =
-{':', ':'};
-
-struct symbol *
-parse_nested_classes_for_hpacc (char *name, int len, char **token,
- int *class_prefix, char **argptr)
-{
- /* Comment below comes from decode_line_1 which has very similar
- code, which is called for "break" command parsing. */
-
- /* We have what looks like a class or namespace
- scope specification (A::B), possibly with many
- levels of namespaces or classes (A::B::C::D).
-
- Some versions of the HP ANSI C++ compiler (as also possibly
- other compilers) generate class/function/member names with
- embedded double-colons if they are inside namespaces. To
- handle this, we loop a few times, considering larger and
- larger prefixes of the string as though they were single
- symbols. So, if the initially supplied string is
- A::B::C::D::foo, we have to look up "A", then "A::B",
- then "A::B::C", then "A::B::C::D", and finally
- "A::B::C::D::foo" as single, monolithic symbols, because
- A, B, C or D may be namespaces.
-
- Note that namespaces can nest only inside other
- namespaces, and not inside classes. So we need only
- consider *prefixes* of the string; there is no need to look up
- "B::C" separately as a symbol in the previous example. */
-
- register char *p;
- char *start, *end;
- char *prefix = NULL;
- char *tmp;
- struct symbol *sym_class = NULL;
- struct symbol *sym_var = NULL;
- struct type *t;
- int prefix_len = 0;
- int done = 0;
- char *q;
-
- /* Check for HP-compiled executable -- in other cases
- return NULL, and caller must default to standard GDB
- behaviour. */
-
- if (!hp_som_som_object_present)
- return (struct symbol *) NULL;
-
- p = name;
-
- /* Skip over whitespace and possible global "::" */
- while (*p && (*p == ' ' || *p == '\t'))
- p++;
- if (p[0] == ':' && p[1] == ':')
- p += 2;
- while (*p && (*p == ' ' || *p == '\t'))
- p++;
-
- while (1)
- {
- /* Get to the end of the next namespace or class spec. */
- /* If we're looking at some non-token, fail immediately */
- start = p;
- if (!(isalpha (*p) || *p == '$' || *p == '_'))
- return (struct symbol *) NULL;
- p++;
- while (*p && (isalnum (*p) || *p == '$' || *p == '_'))
- p++;
-
- if (*p == '<')
- {
- /* If we have the start of a template specification,
- scan right ahead to its end */
- q = find_template_name_end (p);
- if (q)
- p = q;
- }
-
- end = p;
-
- /* Skip over "::" and whitespace for next time around */
- while (*p && (*p == ' ' || *p == '\t'))
- p++;
- if (p[0] == ':' && p[1] == ':')
- p += 2;
- while (*p && (*p == ' ' || *p == '\t'))
- p++;
-
- /* Done with tokens? */
- if (!*p || !(isalpha (*p) || *p == '$' || *p == '_'))
- done = 1;
-
- tmp = (char *) alloca (prefix_len + end - start + 3);
- if (prefix)
- {
- memcpy (tmp, prefix, prefix_len);
- memcpy (tmp + prefix_len, coloncolon, 2);
- memcpy (tmp + prefix_len + 2, start, end - start);
- tmp[prefix_len + 2 + end - start] = '\000';
- }
- else
- {
- memcpy (tmp, start, end - start);
- tmp[end - start] = '\000';
- }
-
- prefix = tmp;
- prefix_len = strlen (prefix);
-
- /* See if the prefix we have now is something we know about */
-
- if (!done)
- {
- /* More tokens to process, so this must be a class/namespace */
- sym_class = lookup_symbol (prefix, 0, STRUCT_NAMESPACE,
- 0, (struct symtab **) NULL);
- }
- else
- {
- /* No more tokens, so try as a variable first */
- sym_var = lookup_symbol (prefix, 0, VAR_NAMESPACE,
- 0, (struct symtab **) NULL);
- /* If failed, try as class/namespace */
- if (!sym_var)
- sym_class = lookup_symbol (prefix, 0, STRUCT_NAMESPACE,
- 0, (struct symtab **) NULL);
- }
-
- if (sym_var ||
- (sym_class &&
- (t = check_typedef (SYMBOL_TYPE (sym_class)),
- (TYPE_CODE (t) == TYPE_CODE_STRUCT
- || TYPE_CODE (t) == TYPE_CODE_UNION))))
- {
- /* We found a valid token */
- *token = (char *) xmalloc (prefix_len + 1);
- memcpy (*token, prefix, prefix_len);
- (*token)[prefix_len] = '\000';
- break;
- }
-
- /* No variable or class/namespace found, no more tokens */
- if (done)
- return (struct symbol *) NULL;
- }
-
- /* Out of loop, so we must have found a valid token */
- if (sym_var)
- *class_prefix = 0;
- else
- *class_prefix = 1;
-
- if (argptr)
- *argptr = done ? p : end;
-
- return sym_var ? sym_var : sym_class; /* found */
-}
-
-char *
-find_template_name_end (char *p)
+const char *
+find_template_name_end (const char *p)
{
int depth = 1;
int just_seen_right = 0;
case '\"':
case '{':
case '}':
- /* In future, may want to allow these?? */
+ /* In future, may want to allow these?? */
return 0;
case '<':
depth++; /* start nested template */
}
\f
+/* Return a null-terminated temporary copy of the name of a string token.
-/* Return a null-terminated temporary copy of the name
- of a string token. */
+ Tokens that refer to names do so with explicit pointer and length,
+ so they can share the storage that lexptr is parsing.
+ When it is necessary to pass a name to a function that expects
+ a null-terminated string, the substring is copied out
+ into a separate block of storage. */
-char *
+std::string
copy_name (struct stoken token)
{
- memcpy (namecopy, token.ptr, token.length);
- namecopy[token.length] = 0;
- return namecopy;
+ return std::string (token.ptr, token.length);
}
\f
-/* Reverse an expression from suffix form (in which it is constructed)
- to prefix form (in which we can conveniently print or execute it). */
-static void
-prefixify_expression (register struct expression *expr)
+/* See comments on parser-defs.h. */
+
+int
+prefixify_expression (struct expression *expr, int last_struct)
{
- register int len =
- sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts);
- register struct expression *temp;
- register int inpos = expr->nelts, outpos = 0;
+ gdb_assert (expr->nelts > 0);
+ int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts);
+ struct expression *temp;
+ int inpos = expr->nelts, outpos = 0;
temp = (struct expression *) alloca (len);
/* Copy the original expression into temp. */
memcpy (temp, expr, len);
- prefixify_subexp (temp, expr, inpos, outpos);
+ return prefixify_subexp (temp, expr, inpos, outpos, last_struct);
}
-/* Return the number of exp_elements in the subexpression of EXPR
- whose last exp_element is at index ENDPOS - 1 in EXPR. */
+/* Return the number of exp_elements in the postfix subexpression
+ of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
-int
-length_of_subexp (register struct expression *expr, register int endpos)
+static int
+length_of_subexp (struct expression *expr, int endpos)
{
- register int oplen = 1;
- register int args = 0;
- register int i;
+ int oplen, args;
+
+ operator_length (expr, endpos, &oplen, &args);
+
+ while (args > 0)
+ {
+ oplen += length_of_subexp (expr, endpos - oplen);
+ args--;
+ }
+
+ return oplen;
+}
+
+/* Sets *OPLENP to the length of the operator whose (last) index is
+ ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
+ operator takes. */
+
+void
+operator_length (const struct expression *expr, int endpos, int *oplenp,
+ int *argsp)
+{
+ expr->language_defn->la_exp_desc->operator_length (expr, endpos,
+ oplenp, argsp);
+}
+
+/* Default value for operator_length in exp_descriptor vectors. */
+
+void
+operator_length_standard (const struct expression *expr, int endpos,
+ int *oplenp, int *argsp)
+{
+ int oplen = 1;
+ int args = 0;
+ enum range_type range_type;
+ int i;
if (endpos < 1)
- error ("?error in length_of_subexp");
+ error (_("?error in operator_length_standard"));
i = (int) expr->elts[endpos - 1].opcode;
break;
case OP_LONG:
- case OP_DOUBLE:
+ case OP_FLOAT:
case OP_VAR_VALUE:
+ case OP_VAR_MSYM_VALUE:
oplen = 4;
break;
+ case OP_FUNC_STATIC_VAR:
+ oplen = longest_to_int (expr->elts[endpos - 2].longconst);
+ oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
+ args = 1;
+ break;
+
case OP_TYPE:
case OP_BOOL:
case OP_LAST:
- case OP_REGISTER:
case OP_INTERNALVAR:
+ case OP_VAR_ENTRY_VALUE:
oplen = 3;
break;
case OP_COMPLEX:
- oplen = 1;
+ oplen = 3;
args = 2;
break;
args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
break;
- case OP_MSGCALL: /* Objective C message (method) call */
+ case TYPE_INSTANCE:
+ oplen = 5 + longest_to_int (expr->elts[endpos - 2].longconst);
+ args = 1;
+ break;
+
+ case OP_OBJC_MSGCALL: /* Objective C message (method) call. */
oplen = 4;
args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
break;
oplen = 3;
break;
+ case UNOP_CAST_TYPE:
+ case UNOP_DYNAMIC_CAST:
+ case UNOP_REINTERPRET_CAST:
+ case UNOP_MEMVAL_TYPE:
+ oplen = 1;
+ args = 2;
+ break;
+
case BINOP_VAL:
case UNOP_CAST:
case UNOP_MEMVAL:
case UNOP_ODD:
case UNOP_ORD:
case UNOP_TRUNC:
+ case OP_TYPEOF:
+ case OP_DECLTYPE:
+ case OP_TYPEID:
oplen = 1;
args = 1;
break;
- case OP_LABELED:
+ case OP_ADL_FUNC:
+ oplen = longest_to_int (expr->elts[endpos - 2].longconst);
+ oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
+ oplen++;
+ oplen++;
+ break;
+
case STRUCTOP_STRUCT:
case STRUCTOP_PTR:
args = 1;
/* fall through */
+ case OP_REGISTER:
case OP_M2_STRING:
case OP_STRING:
- case OP_NSSTRING: /* Objective C Foundation Class NSString constant */
- case OP_SELECTOR: /* Objective C "@selector" pseudo-op */
+ case OP_OBJC_NSSTRING: /* Objective C Foundation Class
+ NSString constant. */
+ case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op. */
case OP_NAME:
- case OP_EXPRSTRING:
oplen = longest_to_int (expr->elts[endpos - 2].longconst);
oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
break;
- case OP_BITSTRING:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen);
- break;
-
case OP_ARRAY:
oplen = 4;
args = longest_to_int (expr->elts[endpos - 2].longconst);
case TERNOP_COND:
case TERNOP_SLICE:
- case TERNOP_SLICE_COUNT:
args = 3;
break;
/* C++ */
case OP_THIS:
- case OP_SELF:
oplen = 2;
break;
+ case OP_RANGE:
+ oplen = 3;
+ range_type = (enum range_type)
+ longest_to_int (expr->elts[endpos - 2].longconst);
+
+ switch (range_type)
+ {
+ case LOW_BOUND_DEFAULT:
+ case LOW_BOUND_DEFAULT_EXCLUSIVE:
+ case HIGH_BOUND_DEFAULT:
+ args = 1;
+ break;
+ case BOTH_BOUND_DEFAULT:
+ args = 0;
+ break;
+ case NONE_BOUND_DEFAULT:
+ case NONE_BOUND_DEFAULT_EXCLUSIVE:
+ args = 2;
+ break;
+ }
+
+ break;
+
default:
args = 1 + (i < (int) BINOP_END);
}
- while (args > 0)
- {
- oplen += length_of_subexp (expr, endpos - oplen);
- args--;
- }
-
- return oplen;
+ *oplenp = oplen;
+ *argsp = args;
}
/* Copy the subexpression ending just before index INEND in INEXPR
into OUTEXPR, starting at index OUTBEG.
- In the process, convert it from suffix to prefix form. */
-
-static void
-prefixify_subexp (register struct expression *inexpr,
- struct expression *outexpr, register int inend, int outbeg)
+ In the process, convert it from suffix to prefix form.
+ If LAST_STRUCT is -1, then this function always returns -1.
+ Otherwise, it returns the index of the subexpression which is the
+ left-hand-side of the expression at LAST_STRUCT. */
+
+static int
+prefixify_subexp (struct expression *inexpr,
+ struct expression *outexpr, int inend, int outbeg,
+ int last_struct)
{
- register int oplen = 1;
- register int args = 0;
- register int i;
+ int oplen;
+ int args;
+ int i;
int *arglens;
- enum exp_opcode opcode;
-
- /* Compute how long the last operation is (in OPLEN),
- and also how many preceding subexpressions serve as
- arguments for it (in ARGS). */
-
- opcode = inexpr->elts[inend - 1].opcode;
- switch (opcode)
- {
- /* C++ */
- case OP_SCOPE:
- oplen = longest_to_int (inexpr->elts[inend - 2].longconst);
- oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1);
- break;
-
- case OP_LONG:
- case OP_DOUBLE:
- case OP_VAR_VALUE:
- oplen = 4;
- break;
-
- case OP_TYPE:
- case OP_BOOL:
- case OP_LAST:
- case OP_REGISTER:
- case OP_INTERNALVAR:
- oplen = 3;
- break;
-
- case OP_COMPLEX:
- oplen = 1;
- args = 2;
- break;
-
- case OP_FUNCALL:
- case OP_F77_UNDETERMINED_ARGLIST:
- oplen = 3;
- args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst);
- break;
+ int result = -1;
- case OP_MSGCALL: /* Objective C message (method) call */
- oplen = 4;
- args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst);
- break;
-
- case UNOP_MIN:
- case UNOP_MAX:
- oplen = 3;
- break;
-
- case UNOP_CAST:
- case UNOP_MEMVAL:
- oplen = 3;
- args = 1;
- break;
-
- case UNOP_ABS:
- case UNOP_CAP:
- case UNOP_CHR:
- case UNOP_FLOAT:
- case UNOP_HIGH:
- case UNOP_ODD:
- case UNOP_ORD:
- case UNOP_TRUNC:
- oplen = 1;
- args = 1;
- break;
-
- case STRUCTOP_STRUCT:
- case STRUCTOP_PTR:
- case OP_LABELED:
- args = 1;
- /* fall through */
- case OP_M2_STRING:
- case OP_STRING:
- case OP_NSSTRING: /* Objective C Foundation Class NSString constant */
- case OP_SELECTOR: /* Objective C "@selector" pseudo-op */
- case OP_NAME:
- case OP_EXPRSTRING:
- oplen = longest_to_int (inexpr->elts[inend - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- break;
-
- case OP_BITSTRING:
- oplen = longest_to_int (inexpr->elts[inend - 2].longconst);
- oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen);
- break;
-
- case OP_ARRAY:
- oplen = 4;
- args = longest_to_int (inexpr->elts[inend - 2].longconst);
- args -= longest_to_int (inexpr->elts[inend - 3].longconst);
- args += 1;
- break;
-
- case TERNOP_COND:
- case TERNOP_SLICE:
- case TERNOP_SLICE_COUNT:
- args = 3;
- break;
-
- case BINOP_ASSIGN_MODIFY:
- oplen = 3;
- args = 2;
- break;
-
- /* Modula-2 */
- case MULTI_SUBSCRIPT:
- oplen = 3;
- args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst);
- break;
-
- /* C++ */
- case OP_THIS:
- case OP_SELF:
- oplen = 2;
- break;
-
- default:
- args = 1 + ((int) opcode < (int) BINOP_END);
- }
+ operator_length (inexpr, inend, &oplen, &args);
/* Copy the final operator itself, from the end of the input
to the beginning of the output. */
EXP_ELEM_TO_BYTES (oplen));
outbeg += oplen;
+ if (last_struct == inend)
+ result = outbeg - oplen;
+
/* Find the lengths of the arg subexpressions. */
arglens = (int *) alloca (args * sizeof (int));
for (i = args - 1; i >= 0; i--)
outbeg does similarly in the output. */
for (i = 0; i < args; i++)
{
+ int r;
+
oplen = arglens[i];
inend += oplen;
- prefixify_subexp (inexpr, outexpr, inend, outbeg);
+ r = prefixify_subexp (inexpr, outexpr, inend, outbeg, last_struct);
+ if (r != -1)
+ {
+ /* Return immediately. We probably have only parsed a
+ partial expression, so we don't want to try to reverse
+ the other operands. */
+ return r;
+ }
outbeg += oplen;
}
+
+ return result;
}
\f
-/* This page contains the two entry points to this file. */
-
/* Read an expression from the string *STRINGPTR points to,
- parse it, and return a pointer to a struct expression that we malloc.
+ parse it, and return a pointer to a struct expression that we malloc.
Use block BLOCK as the lexical context for variable names;
if BLOCK is zero, use the block of the selected stack frame.
Meanwhile, advance *STRINGPTR to point after the expression,
If COMMA is nonzero, stop if a comma is reached. */
-struct expression *
-parse_exp_1 (char **stringptr, struct block *block, int comma)
+expression_up
+parse_exp_1 (const char **stringptr, CORE_ADDR pc, const struct block *block,
+ int comma, innermost_block_tracker *tracker)
{
- struct cleanup *old_chain;
+ return parse_exp_in_context (stringptr, pc, block, comma, 0, NULL,
+ tracker, nullptr);
+}
- lexptr = *stringptr;
- prev_lexptr = NULL;
+/* As for parse_exp_1, except that if VOID_CONTEXT_P, then
+ no value is expected from the expression.
+ OUT_SUBEXP is set when attempting to complete a field name; in this
+ case it is set to the index of the subexpression on the
+ left-hand-side of the struct op. If not doing such completion, it
+ is left untouched. */
+
+static expression_up
+parse_exp_in_context (const char **stringptr, CORE_ADDR pc,
+ const struct block *block,
+ int comma, int void_context_p, int *out_subexp,
+ innermost_block_tracker *tracker,
+ expr_completion_state *cstate)
+{
+ const struct language_defn *lang = NULL;
+ int subexp;
- paren_depth = 0;
- type_stack_depth = 0;
+ if (*stringptr == 0 || **stringptr == 0)
+ error_no_arg (_("expression to compute"));
- comma_terminates = comma;
+ const struct block *expression_context_block = block;
+ CORE_ADDR expression_context_pc = 0;
+
+ innermost_block_tracker local_tracker;
+ if (tracker == nullptr)
+ tracker = &local_tracker;
+
+ /* If no context specified, try using the current frame, if any. */
+ if (!expression_context_block)
+ expression_context_block = get_selected_block (&expression_context_pc);
+ else if (pc == 0)
+ expression_context_pc = BLOCK_ENTRY_PC (expression_context_block);
+ else
+ expression_context_pc = pc;
- if (lexptr == 0 || *lexptr == 0)
- error_no_arg ("expression to compute");
+ /* Fall back to using the current source static context, if any. */
- old_chain = make_cleanup (free_funcalls, 0 /*ignore*/);
- funcall_chain = 0;
+ if (!expression_context_block)
+ {
+ struct symtab_and_line cursal = get_current_source_symtab_and_line ();
+ if (cursal.symtab)
+ expression_context_block
+ = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal.symtab),
+ STATIC_BLOCK);
+ if (expression_context_block)
+ expression_context_pc = BLOCK_ENTRY_PC (expression_context_block);
+ }
- if (block)
+ if (language_mode == language_mode_auto && block != NULL)
{
- expression_context_block = block;
- expression_context_pc = BLOCK_START (block);
+ /* Find the language associated to the given context block.
+ Default to the current language if it can not be determined.
+
+ Note that using the language corresponding to the current frame
+ can sometimes give unexpected results. For instance, this
+ routine is often called several times during the inferior
+ startup phase to re-parse breakpoint expressions after
+ a new shared library has been loaded. The language associated
+ to the current frame at this moment is not relevant for
+ the breakpoint. Using it would therefore be silly, so it seems
+ better to rely on the current language rather than relying on
+ the current frame language to parse the expression. That's why
+ we do the following language detection only if the context block
+ has been specifically provided. */
+ struct symbol *func = block_linkage_function (block);
+
+ if (func != NULL)
+ lang = language_def (func->language ());
+ if (lang == NULL || lang->la_language == language_unknown)
+ lang = current_language;
}
else
- expression_context_block = get_selected_block (&expression_context_pc);
+ lang = current_language;
- namecopy = (char *) alloca (strlen (lexptr) + 1);
- expout_size = 10;
- expout_ptr = 0;
- expout = (struct expression *)
- xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size));
- expout->language_defn = current_language;
- make_cleanup (free_current_contents, &expout);
+ /* get_current_arch may reset CURRENT_LANGUAGE via select_frame.
+ While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
+ and others called from *.y) ensure CURRENT_LANGUAGE gets restored
+ to the value matching SELECTED_FRAME as set by get_current_arch. */
- if (current_language->la_parser ())
- current_language->la_error (NULL);
+ parser_state ps (lang, get_current_arch (), expression_context_block,
+ expression_context_pc, comma, *stringptr,
+ cstate != nullptr, tracker);
- discard_cleanups (old_chain);
+ scoped_restore_current_language lang_saver;
+ set_language (lang->la_language);
- /* Record the actual number of expression elements, and then
- reallocate the expression memory so that we free up any
- excess elements. */
+ try
+ {
+ lang->la_parser (&ps);
+ }
+ catch (const gdb_exception &except)
+ {
+ /* If parsing for completion, allow this to succeed; but if no
+ expression elements have been written, then there's nothing
+ to do, so fail. */
+ if (! ps.parse_completion || ps.expout_ptr == 0)
+ throw;
+ }
- expout->nelts = expout_ptr;
- expout = (struct expression *)
- xrealloc ((char *) expout,
- sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));;
+ /* We have to operate on an "expression *", due to la_post_parser,
+ which explains this funny-looking double release. */
+ expression_up result = ps.release ();
/* Convert expression from postfix form as generated by yacc
- parser, to a prefix form. */
+ parser, to a prefix form. */
if (expressiondebug)
- dump_prefix_expression (expout, gdb_stdlog,
- "before conversion to prefix form");
+ dump_raw_expression (result.get (), gdb_stdlog,
+ "before conversion to prefix form");
- prefixify_expression (expout);
+ subexp = prefixify_expression (result.get (),
+ ps.m_completion_state.expout_last_struct);
+ if (out_subexp)
+ *out_subexp = subexp;
+
+ lang->la_post_parser (&result, void_context_p, ps.parse_completion,
+ tracker);
if (expressiondebug)
- dump_postfix_expression (expout, gdb_stdlog,
- "after conversion to prefix form");
+ dump_prefix_expression (result.get (), gdb_stdlog);
- *stringptr = lexptr;
- return expout;
+ if (cstate != nullptr)
+ *cstate = std::move (ps.m_completion_state);
+ *stringptr = ps.lexptr;
+ return result;
}
/* Parse STRING as an expression, and complain if this fails
to use up all of the contents of STRING. */
-struct expression *
-parse_expression (char *string)
+expression_up
+parse_expression (const char *string, innermost_block_tracker *tracker)
{
- register struct expression *exp;
- exp = parse_exp_1 (&string, 0, 0);
+ expression_up exp = parse_exp_1 (&string, 0, 0, 0, tracker);
if (*string)
- error ("Junk after end of expression.");
+ error (_("Junk after end of expression."));
return exp;
}
-\f
-/* Stuff for maintaining a stack of types. Currently just used by C, but
- probably useful for any language which declares its types "backwards". */
-static void
-check_type_stack_depth (void)
+/* Same as parse_expression, but using the given language (LANG)
+ to parse the expression. */
+
+expression_up
+parse_expression_with_language (const char *string, enum language lang)
{
- if (type_stack_depth == type_stack_size)
+ gdb::optional<scoped_restore_current_language> lang_saver;
+ if (current_language->la_language != lang)
{
- type_stack_size *= 2;
- type_stack = (union type_stack_elt *)
- xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack));
+ lang_saver.emplace ();
+ set_language (lang);
}
-}
-void
-push_type (enum type_pieces tp)
-{
- check_type_stack_depth ();
- type_stack[type_stack_depth++].piece = tp;
+ return parse_expression (string);
}
-void
-push_type_int (int n)
+/* Parse STRING as an expression. If parsing ends in the middle of a
+ field reference, return the type of the left-hand-side of the
+ reference; furthermore, if the parsing ends in the field name,
+ return the field name in *NAME. If the parsing ends in the middle
+ of a field reference, but the reference is somehow invalid, throw
+ an exception. In all other cases, return NULL. */
+
+struct type *
+parse_expression_for_completion (const char *string,
+ gdb::unique_xmalloc_ptr<char> *name,
+ enum type_code *code)
{
- check_type_stack_depth ();
- type_stack[type_stack_depth++].int_val = n;
+ expression_up exp;
+ struct value *val;
+ int subexp;
+ expr_completion_state cstate;
+
+ try
+ {
+ exp = parse_exp_in_context (&string, 0, 0, 0, 0, &subexp,
+ nullptr, &cstate);
+ }
+ catch (const gdb_exception_error &except)
+ {
+ /* Nothing, EXP remains NULL. */
+ }
+
+ if (exp == NULL)
+ return NULL;
+
+ if (cstate.expout_tag_completion_type != TYPE_CODE_UNDEF)
+ {
+ *code = cstate.expout_tag_completion_type;
+ *name = std::move (cstate.expout_completion_name);
+ return NULL;
+ }
+
+ if (cstate.expout_last_struct == -1)
+ return NULL;
+
+ const char *fieldname = extract_field_op (exp.get (), &subexp);
+ if (fieldname == NULL)
+ {
+ name->reset ();
+ return NULL;
+ }
+
+ name->reset (xstrdup (fieldname));
+ /* This might throw an exception. If so, we want to let it
+ propagate. */
+ val = evaluate_subexpression_type (exp.get (), subexp);
+
+ return value_type (val);
}
+/* A post-parser that does nothing. */
+
void
-push_type_address_space (char *string)
+null_post_parser (expression_up *exp, int void_context_p, int completin,
+ innermost_block_tracker *tracker)
{
- push_type_int (address_space_name_to_int (string));
}
-enum type_pieces
-pop_type (void)
-{
- if (type_stack_depth)
- return type_stack[--type_stack_depth].piece;
- return tp_end;
-}
+/* Parse floating point value P of length LEN.
+ Return false if invalid, true if valid.
+ The successfully parsed number is stored in DATA in
+ target format for floating-point type TYPE.
-int
-pop_type_int (void)
-{
- if (type_stack_depth)
- return type_stack[--type_stack_depth].int_val;
- /* "Can't happen". */
- return 0;
-}
+ NOTE: This accepts the floating point syntax that sscanf accepts. */
-/* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
- as modified by all the stuff on the stack. */
-struct type *
-follow_types (struct type *follow_type)
+bool
+parse_float (const char *p, int len,
+ const struct type *type, gdb_byte *data)
{
- int done = 0;
- int make_const = 0;
- int make_volatile = 0;
- int make_addr_space = 0;
- int array_size;
- struct type *range_type;
-
- while (!done)
- switch (pop_type ())
- {
- case tp_end:
- done = 1;
- if (make_const)
- follow_type = make_cv_type (make_const,
- TYPE_VOLATILE (follow_type),
- follow_type, 0);
- if (make_volatile)
- follow_type = make_cv_type (TYPE_CONST (follow_type),
- make_volatile,
- follow_type, 0);
- if (make_addr_space)
- follow_type = make_type_with_address_space (follow_type,
- make_addr_space);
- make_const = make_volatile = 0;
- make_addr_space = 0;
- break;
- case tp_const:
- make_const = 1;
- break;
- case tp_volatile:
- make_volatile = 1;
- break;
- case tp_space_identifier:
- make_addr_space = pop_type_int ();
- break;
- case tp_pointer:
- follow_type = lookup_pointer_type (follow_type);
- if (make_const)
- follow_type = make_cv_type (make_const,
- TYPE_VOLATILE (follow_type),
- follow_type, 0);
- if (make_volatile)
- follow_type = make_cv_type (TYPE_CONST (follow_type),
- make_volatile,
- follow_type, 0);
- if (make_addr_space)
- follow_type = make_type_with_address_space (follow_type,
- make_addr_space);
- make_const = make_volatile = 0;
- make_addr_space = 0;
- break;
- case tp_reference:
- follow_type = lookup_reference_type (follow_type);
- if (make_const)
- follow_type = make_cv_type (make_const,
- TYPE_VOLATILE (follow_type),
- follow_type, 0);
- if (make_volatile)
- follow_type = make_cv_type (TYPE_CONST (follow_type),
- make_volatile,
- follow_type, 0);
- if (make_addr_space)
- follow_type = make_type_with_address_space (follow_type,
- make_addr_space);
- make_const = make_volatile = 0;
- make_addr_space = 0;
- break;
- case tp_array:
- array_size = pop_type_int ();
- /* FIXME-type-allocation: need a way to free this type when we are
- done with it. */
- range_type =
- create_range_type ((struct type *) NULL,
- builtin_type_int, 0,
- array_size >= 0 ? array_size - 1 : 0);
- follow_type =
- create_array_type ((struct type *) NULL,
- follow_type, range_type);
- if (array_size < 0)
- TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type)
- = BOUND_CANNOT_BE_DETERMINED;
- break;
- case tp_function:
- /* FIXME-type-allocation: need a way to free this type when we are
- done with it. */
- follow_type = lookup_function_type (follow_type);
- break;
- }
- return follow_type;
+ return target_float_from_string (data, type, std::string (p, len));
}
\f
-static void build_parse (void);
-static void
-build_parse (void)
-{
- int i;
-
- msym_text_symbol_type =
- init_type (TYPE_CODE_FUNC, 1, 0, "<text variable, no debug info>", NULL);
- TYPE_TARGET_TYPE (msym_text_symbol_type) = builtin_type_int;
- msym_data_symbol_type =
- init_type (TYPE_CODE_INT, TARGET_INT_BIT / HOST_CHAR_BIT, 0,
- "<data variable, no debug info>", NULL);
- msym_unknown_symbol_type =
- init_type (TYPE_CODE_INT, 1, 0,
- "<variable (not text or data), no debug info>",
- NULL);
-}
-
/* This function avoids direct calls to fprintf
in the parser generated debug code. */
void
parser_fprintf (FILE *x, const char *y, ...)
{
va_list args;
+
va_start (args, y);
if (x == stderr)
vfprintf_unfiltered (gdb_stderr, y, args);
va_end (args);
}
+/* Implementation of the exp_descriptor method operator_check. */
+
+int
+operator_check_standard (struct expression *exp, int pos,
+ int (*objfile_func) (struct objfile *objfile,
+ void *data),
+ void *data)
+{
+ const union exp_element *const elts = exp->elts;
+ struct type *type = NULL;
+ struct objfile *objfile = NULL;
+
+ /* Extended operators should have been already handled by exp_descriptor
+ iterate method of its specific language. */
+ gdb_assert (elts[pos].opcode < OP_EXTENDED0);
+
+ /* Track the callers of write_exp_elt_type for this table. */
+
+ switch (elts[pos].opcode)
+ {
+ case BINOP_VAL:
+ case OP_COMPLEX:
+ case OP_FLOAT:
+ case OP_LONG:
+ case OP_SCOPE:
+ case OP_TYPE:
+ case UNOP_CAST:
+ case UNOP_MAX:
+ case UNOP_MEMVAL:
+ case UNOP_MIN:
+ type = elts[pos + 1].type;
+ break;
+
+ case TYPE_INSTANCE:
+ {
+ LONGEST arg, nargs = elts[pos + 2].longconst;
+
+ for (arg = 0; arg < nargs; arg++)
+ {
+ struct type *inst_type = elts[pos + 3 + arg].type;
+ struct objfile *inst_objfile = TYPE_OBJFILE (inst_type);
+
+ if (inst_objfile && (*objfile_func) (inst_objfile, data))
+ return 1;
+ }
+ }
+ break;
+
+ case OP_VAR_VALUE:
+ {
+ const struct block *const block = elts[pos + 1].block;
+ const struct symbol *const symbol = elts[pos + 2].symbol;
+
+ /* Check objfile where the variable itself is placed.
+ SYMBOL_OBJ_SECTION (symbol) may be NULL. */
+ if ((*objfile_func) (symbol_objfile (symbol), data))
+ return 1;
+
+ /* Check objfile where is placed the code touching the variable. */
+ objfile = lookup_objfile_from_block (block);
+
+ type = SYMBOL_TYPE (symbol);
+ }
+ break;
+ case OP_VAR_MSYM_VALUE:
+ objfile = elts[pos + 1].objfile;
+ break;
+ }
+
+ /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
+
+ if (type && TYPE_OBJFILE (type)
+ && (*objfile_func) (TYPE_OBJFILE (type), data))
+ return 1;
+ if (objfile && (*objfile_func) (objfile, data))
+ return 1;
+
+ return 0;
+}
+
+/* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
+ OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
+ passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
+ returns non-zero value then (any other) non-zero value is immediately
+ returned to the caller. Otherwise zero is returned after iterating
+ through whole EXP. */
+
+static int
+exp_iterate (struct expression *exp,
+ int (*objfile_func) (struct objfile *objfile, void *data),
+ void *data)
+{
+ int endpos;
+
+ for (endpos = exp->nelts; endpos > 0; )
+ {
+ int pos, args, oplen = 0;
+
+ operator_length (exp, endpos, &oplen, &args);
+ gdb_assert (oplen > 0);
+
+ pos = endpos - oplen;
+ if (exp->language_defn->la_exp_desc->operator_check (exp, pos,
+ objfile_func, data))
+ return 1;
+
+ endpos = pos;
+ }
+
+ return 0;
+}
+
+/* Helper for exp_uses_objfile. */
+
+static int
+exp_uses_objfile_iter (struct objfile *exp_objfile, void *objfile_voidp)
+{
+ struct objfile *objfile = (struct objfile *) objfile_voidp;
+
+ if (exp_objfile->separate_debug_objfile_backlink)
+ exp_objfile = exp_objfile->separate_debug_objfile_backlink;
+
+ return exp_objfile == objfile;
+}
+
+/* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
+ is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
+ file. */
+
+int
+exp_uses_objfile (struct expression *exp, struct objfile *objfile)
+{
+ gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
+
+ return exp_iterate (exp, exp_uses_objfile_iter, objfile);
+}
+
+/* Reallocate the `expout' pointer inside PS so that it can accommodate
+ at least LENELT expression elements. This function does nothing if
+ there is enough room for the elements. */
+
+static void
+increase_expout_size (struct expr_builder *ps, size_t lenelt)
+{
+ if ((ps->expout_ptr + lenelt) >= ps->expout_size)
+ {
+ ps->expout_size = std::max (ps->expout_size * 2,
+ ps->expout_ptr + lenelt + 10);
+ ps->expout.reset (XRESIZEVAR (expression,
+ ps->expout.release (),
+ (sizeof (struct expression)
+ + EXP_ELEM_TO_BYTES (ps->expout_size))));
+ }
+}
+
void
_initialize_parse (void)
{
- type_stack_size = 80;
- type_stack_depth = 0;
- type_stack = (union type_stack_elt *)
- xmalloc (type_stack_size * sizeof (*type_stack));
-
- build_parse ();
-
- /* FIXME - For the moment, handle types by swapping them in and out.
- Should be using the per-architecture data-pointer and a large
- struct. */
- register_gdbarch_swap (&msym_text_symbol_type, sizeof (msym_text_symbol_type), NULL);
- register_gdbarch_swap (&msym_data_symbol_type, sizeof (msym_data_symbol_type), NULL);
- register_gdbarch_swap (&msym_unknown_symbol_type, sizeof (msym_unknown_symbol_type), NULL);
-
- register_gdbarch_swap (NULL, 0, build_parse);
-
- add_show_from_set (
- add_set_cmd ("expression", class_maintenance, var_zinteger,
- (char *) &expressiondebug,
- "Set expression debugging.\n\
-When non-zero, the internal representation of expressions will be printed.",
- &setdebuglist),
- &showdebuglist);
+ add_setshow_zuinteger_cmd ("expression", class_maintenance,
+ &expressiondebug,
+ _("Set expression debugging."),
+ _("Show expression debugging."),
+ _("When non-zero, the internal representation "
+ "of expressions will be printed."),
+ NULL,
+ show_expressiondebug,
+ &setdebuglist, &showdebuglist);
+ add_setshow_boolean_cmd ("parser", class_maintenance,
+ &parser_debug,
+ _("Set parser debugging."),
+ _("Show parser debugging."),
+ _("When non-zero, expression parser "
+ "tracing will be enabled."),
+ NULL,
+ show_parserdebug,
+ &setdebuglist, &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff