/* 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, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
+ 1998, 1999, 2000, 2001, 2004, 2005, 2007 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.
#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 "inferior.h"
#include "doublest.h"
#include "gdb_assert.h"
#include "block.h"
+#include "source.h"
+#include "objfiles.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
-
+/* Standard set of definitions for printing, dumping, prefixifying,
+ * and evaluating expressions. */
+const struct exp_descriptor exp_descriptor_standard =
+ {
+ print_subexp_standard,
+ operator_length_standard,
+ op_name_standard,
+ dump_subexp_body_standard,
+ evaluate_subexp_standard
+ };
\f
/* Global variables declared in parser-defs.h (and commented there). */
struct expression *expout;
int type_stack_depth, type_stack_size;
char *lexptr;
char *prev_lexptr;
-char *namecopy;
int paren_depth;
int comma_terminates;
+
+/* A temporary buffer for identifiers, so we can null-terminate them.
+
+ We allocate this with xrealloc. parse_exp_1 used to allocate with
+ alloca, using the size of the whole expression as a conservative
+ estimate of the space needed. However, macro expansion can
+ introduce names longer than the original expression; there's no
+ practical way to know beforehand how large that might be. */
+char *namecopy;
+size_t namecopy_size;
\f
static int expressiondebug = 0;
-
-extern int hp_som_som_object_present;
+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_subexp (struct expression *, struct expression *, int,
int);
+static struct expression *parse_exp_in_context (char **, struct block *, int,
+ int);
+
void _initialize_parse (void);
/* Data structure for saving values of arglist_len for function calls whose
write_exp_elt_opcode (enum exp_opcode expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.opcode = expelt;
write_exp_elt_sym (struct symbol *expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.symbol = expelt;
write_exp_elt_block (struct block *b)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.block = b;
write_exp_elt (tmp);
}
+void
+write_exp_elt_objfile (struct objfile *objfile)
+{
+ union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
+ tmp.objfile = objfile;
+ write_exp_elt (tmp);
+}
+
void
write_exp_elt_longcst (LONGEST expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.longconst = expelt;
write_exp_elt_dblcst (DOUBLEST expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.doubleconst = expelt;
write_exp_elt (tmp);
}
+void
+write_exp_elt_decfloatcst (gdb_byte expelt[16])
+{
+ union exp_element tmp;
+ int index;
+
+ for (index = 0; index < 16; index++)
+ tmp.decfloatconst[index] = expelt[index];
+
+ write_exp_elt (tmp);
+}
+
void
write_exp_elt_type (struct type *expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.type = expelt;
write_exp_elt_intern (struct internalvar *expelt)
{
union exp_element tmp;
+ memset (&tmp, 0, sizeof (union exp_element));
tmp.internalvar = expelt;
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;
-
void
write_exp_msymbol (struct minimal_symbol *msymbol,
struct type *text_symbol_type,
struct type *data_symbol_type)
{
+ struct gdbarch *gdbarch = current_gdbarch;
CORE_ADDR addr;
write_exp_elt_opcode (OP_LONG);
write_exp_elt_opcode (OP_LONG);
+ if (SYMBOL_BFD_SECTION (msymbol)
+ && SYMBOL_BFD_SECTION (msymbol)->flags & SEC_THREAD_LOCAL)
+ {
+ bfd *bfd = SYMBOL_BFD_SECTION (msymbol)->owner;
+ struct objfile *ofp;
+
+ ALL_OBJFILES (ofp)
+ if (ofp->obfd == bfd)
+ break;
+
+ write_exp_elt_opcode (UNOP_MEMVAL_TLS);
+ write_exp_elt_objfile (ofp);
+ write_exp_elt_type (builtin_type (gdbarch)->nodebug_tls_symbol);
+ write_exp_elt_opcode (UNOP_MEMVAL_TLS);
+ return;
+ }
+
write_exp_elt_opcode (UNOP_MEMVAL);
switch (msymbol->type)
{
case mst_text:
case mst_file_text:
case mst_solib_trampoline:
- write_exp_elt_type (msym_text_symbol_type);
+ write_exp_elt_type (builtin_type (gdbarch)->nodebug_text_symbol);
break;
case mst_data:
case mst_file_data:
case mst_bss:
case mst_file_bss:
- write_exp_elt_type (msym_data_symbol_type);
+ write_exp_elt_type (builtin_type (gdbarch)->nodebug_data_symbol);
break;
default:
- write_exp_elt_type (msym_unknown_symbol_type);
+ write_exp_elt_type (builtin_type (gdbarch)->nodebug_unknown_symbol);
break;
}
write_exp_elt_opcode (UNOP_MEMVAL);
void
write_dollar_variable (struct stoken str)
{
+ struct symbol *sym = NULL;
+ struct minimal_symbol *msym = NULL;
+ struct internalvar *isym = NULL;
+
/* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
and $$digits (equivalent to $<-digits> if you could type that). */
/* Handle tokens that refer to machine registers:
$ followed by a register name. */
- i = frame_map_name_to_regnum (deprecated_selected_frame,
+ i = frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
str.ptr + 1, str.length - 1);
if (i >= 0)
goto handle_register;
- if (SYMBOLS_CAN_START_WITH_DOLLAR)
- {
- struct symbol *sym = NULL;
- struct minimal_symbol *msym = NULL;
+ /* Any names starting with $ are probably debugger internal variables. */
- /* On HP-UX, certain system routines (millicode) have names beginning
- with $ or $$, e.g. $$dyncall, which handles inter-space procedure
- calls on PA-RISC. Check for those, first. */
+ isym = lookup_only_internalvar (copy_name (str) + 1);
+ if (isym)
+ {
+ write_exp_elt_opcode (OP_INTERNALVAR);
+ write_exp_elt_intern (isym);
+ write_exp_elt_opcode (OP_INTERNALVAR);
+ return;
+ }
- /* This code is not enabled on non HP-UX systems, since worst case
- symbol table lookup performance is awful, to put it mildly. */
+ /* On some systems, such as HP-UX and hppa-linux, certain system routines
+ have names beginning with $ or $$. Check for those, first. */
- sym = lookup_symbol (copy_name (str), (struct block *) NULL,
- VAR_DOMAIN, (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_name (str), (struct block *) NULL,
+ VAR_DOMAIN, (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;
}
- /* 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_intern (create_internalvar (copy_name (str) + 1));
write_exp_elt_opcode (OP_INTERNALVAR);
return;
handle_last:
return;
handle_register:
write_exp_elt_opcode (OP_REGISTER);
- write_exp_elt_longcst (i);
+ str.length--;
+ str.ptr++;
+ write_exp_string (str);
write_exp_elt_opcode (OP_REGISTER);
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. */
-
- 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_DOMAIN,
- 0, (struct symtab **) NULL);
- }
- else
- {
- /* No more tokens, so try as a variable first */
- sym_var = lookup_symbol (prefix, 0, VAR_DOMAIN,
- 0, (struct symtab **) NULL);
- /* If failed, try as class/namespace */
- if (!sym_var)
- sym_class = lookup_symbol (prefix, 0, STRUCT_DOMAIN,
- 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)
{
char *
copy_name (struct stoken token)
{
+ /* Make sure there's enough space for the token. */
+ if (namecopy_size < token.length + 1)
+ {
+ namecopy_size = token.length + 1;
+ namecopy = xrealloc (namecopy, token.length + 1);
+ }
+
memcpy (namecopy, token.ptr, token.length);
namecopy[token.length] = 0;
+
return namecopy;
}
\f
void
operator_length (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 (struct expression *expr, int endpos,
+ int *oplenp, int *argsp)
{
int oplen = 1;
int args = 0;
+ enum f90_range_type range_type;
int i;
if (endpos < 1)
- error ("?error in operator_length");
+ error (_("?error in operator_length_standard"));
i = (int) expr->elts[endpos - 1].opcode;
case OP_LONG:
case OP_DOUBLE:
+ case OP_DECFLOAT:
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;
args = 1;
break;
+ case UNOP_MEMVAL_TLS:
+ oplen = 4;
+ args = 1;
+ break;
+
case UNOP_ABS:
case UNOP_CAP:
case UNOP_CHR:
case STRUCTOP_PTR:
args = 1;
/* fall through */
+ case OP_REGISTER:
case OP_M2_STRING:
case OP_STRING:
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;
oplen = 2;
break;
+ case OP_F90_RANGE:
+ oplen = 3;
+
+ range_type = longest_to_int (expr->elts[endpos - 2].longconst);
+ switch (range_type)
+ {
+ case LOW_BOUND_DEFAULT:
+ case HIGH_BOUND_DEFAULT:
+ args = 1;
+ break;
+ case BOTH_BOUND_DEFAULT:
+ args = 0;
+ break;
+ case NONE_BOUND_DEFAULT:
+ args = 2;
+ break;
+ }
+
+ break;
+
default:
args = 1 + (i < (int) BINOP_END);
}
struct expression *
parse_exp_1 (char **stringptr, struct block *block, int comma)
+{
+ return parse_exp_in_context (stringptr, block, comma, 0);
+}
+
+/* As for parse_exp_1, except that if VOID_CONTEXT_P, then
+ no value is expected from the expression. */
+
+static struct expression *
+parse_exp_in_context (char **stringptr, struct block *block, int comma,
+ int void_context_p)
{
struct cleanup *old_chain;
comma_terminates = comma;
if (lexptr == 0 || *lexptr == 0)
- error_no_arg ("expression to compute");
+ error_no_arg (_("expression to compute"));
old_chain = make_cleanup (free_funcalls, 0 /*ignore*/);
funcall_chain = 0;
+ /* If no context specified, try using the current frame, if any. */
+
+ if (!block)
+ block = get_selected_block (&expression_context_pc);
+
+ /* Fall back to using the current source static context, if any. */
+
+ if (!block)
+ {
+ struct symtab_and_line cursal = get_current_source_symtab_and_line ();
+ if (cursal.symtab)
+ block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK);
+ }
+
+ /* Save the context, if specified by caller, or found above. */
+
if (block)
{
expression_context_block = block;
expression_context_pc = BLOCK_START (block);
}
- else
- expression_context_block = get_selected_block (&expression_context_pc);
- namecopy = (char *) alloca (strlen (lexptr) + 1);
expout_size = 10;
expout_ptr = 0;
expout = (struct expression *)
prefixify_expression (expout);
+ current_language->la_post_parser (&expout, void_context_p);
+
if (expressiondebug)
dump_prefix_expression (expout, gdb_stdlog);
struct expression *exp;
exp = parse_exp_1 (&string, 0, 0);
if (*string)
- error ("Junk after end of expression.");
+ error (_("Junk after end of expression."));
+ return exp;
+}
+
+
+/* As for parse_expression, except that if VOID_CONTEXT_P, then
+ no value is expected from the expression. */
+
+struct expression *
+parse_expression_in_context (char *string, int void_context_p)
+{
+ struct expression *exp;
+ exp = parse_exp_in_context (&string, 0, 0, void_context_p);
+ if (*string != '\000')
+ error (_("Junk after end of expression."));
return exp;
}
+
+/* A post-parser that does nothing */
+
+void
+null_post_parser (struct expression **exp, int void_context_p)
+{
+}
\f
/* Stuff for maintaining a stack of types. Currently just used by C, but
probably useful for any language which declares its types "backwards". */
return follow_type;
}
\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
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_zinteger_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);
}
projects / deliverable / binutils-gdb.git / blobdiff