/* Parse expressions for GDB.
Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2008
+ 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2008, 2009
Free Software Foundation, Inc.
Modified from expread.y by the Department of Computer Science at the
#include "block.h"
#include "source.h"
#include "objfiles.h"
+#include "exceptions.h"
+#include "user-regs.h"
/* Standard set of definitions for printing, dumping, prefixifying,
* and evaluating expressions. */
int paren_depth;
int comma_terminates;
+/* True if parsing an expression to find a field reference. This is
+ only used by completion. */
+int in_parse_field;
+
+/* The index of the last struct expression directly before a '.' or
+ '->'. This is set when parsing and is only used when completing a
+ field name. It is -1 if no dereference operation was found. */
+static int expout_last_struct = -1;
+
/* A temporary buffer for identifiers, so we can null-terminate them.
We allocate this with xrealloc. parse_exp_1 used to allocate with
static void free_funcalls (void *ignore);
-static void prefixify_expression (struct expression *);
+static int prefixify_expression (struct expression *);
-static void prefixify_subexp (struct expression *, struct expression *, int,
- int);
+static int prefixify_subexp (struct expression *, struct expression *, int,
+ int);
static struct expression *parse_exp_in_context (char **, struct block *, int,
- int);
+ int, int *);
void _initialize_parse (void);
}
/* 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. */
+ the expression. */
void
-write_exp_msymbol (struct minimal_symbol *msymbol,
- struct type *text_symbol_type,
- struct type *data_symbol_type)
+write_exp_msymbol (struct minimal_symbol *msymbol)
{
- struct gdbarch *gdbarch = current_gdbarch;
- CORE_ADDR addr;
+ struct objfile *objfile = msymbol_objfile (msymbol);
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
+
+ CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ struct obj_section *section = SYMBOL_OBJ_SECTION (msymbol);
+ enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol);
+ CORE_ADDR pc;
+
+ /* The minimal symbol might point to a function descriptor;
+ resolve it to the actual code address instead. */
+ pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target);
+ if (pc != addr)
+ {
+ /* In this case, assume we have a code symbol instead of
+ a data symbol. */
+ type = mst_text;
+ section = NULL;
+ addr = pc;
+ }
+
+ if (overlay_debugging)
+ addr = symbol_overlayed_address (addr, section);
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);
-
- addr = SYMBOL_VALUE_ADDRESS (msymbol);
- if (overlay_debugging)
- addr = symbol_overlayed_address (addr, SYMBOL_BFD_SECTION (msymbol));
+ write_exp_elt_type (builtin_type (gdbarch)->builtin_core_addr);
write_exp_elt_longcst ((LONGEST) addr);
-
write_exp_elt_opcode (OP_LONG);
- if (SYMBOL_BFD_SECTION (msymbol)
- && SYMBOL_BFD_SECTION (msymbol)->flags & SEC_THREAD_LOCAL)
+ if (section && section->the_bfd_section->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_objfile (objfile);
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)
+ switch (type)
{
case mst_text:
case mst_file_text:
}
write_exp_elt_opcode (UNOP_MEMVAL);
}
+
+/* Mark the current index as the starting location of a structure
+ expression. This is used when completing on field names. */
+
+void
+mark_struct_expression (void)
+{
+ expout_last_struct = expout_ptr;
+}
+
\f
/* Recognize tokens that start with '$'. These include:
/* Handle tokens that refer to machine registers:
$ followed by a register name. */
- i = frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
- str.ptr + 1, str.length - 1);
+ i = user_reg_map_name_to_regnum (current_gdbarch,
+ str.ptr + 1, str.length - 1);
if (i >= 0)
goto handle_register;
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);
+ VAR_DOMAIN, (int *) NULL);
if (sym)
{
write_exp_elt_opcode (OP_VAR_VALUE);
msym = lookup_minimal_symbol (copy_name (str), NULL, NULL);
if (msym)
{
- write_exp_msymbol (msym,
- lookup_function_type (builtin_type_int),
- builtin_type_int);
+ write_exp_msymbol (msym);
return;
}
}
\f
/* Reverse an expression from suffix form (in which it is constructed)
- to prefix form (in which we can conveniently print or execute it). */
+ to prefix form (in which we can conveniently print or execute it).
+ Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT
+ is not -1 (i.e., we are trying to complete a field name), it will
+ return the index of the subexpression which is the left-hand-side
+ of the struct operation at EXPOUT_LAST_STRUCT. */
-static void
+static int
prefixify_expression (struct expression *expr)
{
int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts);
/* Copy the original expression into temp. */
memcpy (temp, expr, len);
- prefixify_subexp (temp, expr, inpos, outpos);
+ return prefixify_subexp (temp, expr, inpos, outpos);
}
/* Return the number of exp_elements in the postfix subexpression
break;
case OP_COMPLEX:
- oplen = 1;
+ oplen = 3;
args = 2;
break;
/* 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. */
+ In the process, convert it from suffix to prefix form.
+ If EXPOUT_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 EXPOUT_LAST_STRUCT. */
-static void
+static int
prefixify_subexp (struct expression *inexpr,
struct expression *outexpr, int inend, int outbeg)
{
int i;
int *arglens;
enum exp_opcode opcode;
+ int result = -1;
operator_length (inexpr, inend, &oplen, &args);
EXP_ELEM_TO_BYTES (oplen));
outbeg += oplen;
+ if (expout_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);
+ 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. */
struct expression *
parse_exp_1 (char **stringptr, struct block *block, int comma)
{
- return parse_exp_in_context (stringptr, block, comma, 0);
+ return parse_exp_in_context (stringptr, block, comma, 0, NULL);
}
/* As for parse_exp_1, except that if VOID_CONTEXT_P, then
- no value is expected from the expression. */
+ 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 struct expression *
parse_exp_in_context (char **stringptr, struct block *block, int comma,
- int void_context_p)
+ int void_context_p, int *out_subexp)
{
+ volatile struct gdb_exception except;
struct cleanup *old_chain;
+ int subexp;
lexptr = *stringptr;
prev_lexptr = NULL;
paren_depth = 0;
type_stack_depth = 0;
+ expout_last_struct = -1;
comma_terminates = comma;
old_chain = make_cleanup (free_funcalls, 0 /*ignore*/);
funcall_chain = 0;
- /* If no context specified, try using the current frame, if any. */
+ expression_context_block = block;
- if (!block)
- block = get_selected_block (&expression_context_pc);
+ /* 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
+ expression_context_pc = BLOCK_START (expression_context_block);
- /* Fall back to using the current source static context, if any. */
+ /* Fall back to using the current source static context, if any. */
- if (!block)
+ if (!expression_context_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);
+ expression_context_block
+ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK);
+ if (expression_context_block)
+ expression_context_pc = BLOCK_START (expression_context_block);
}
expout_size = 10;
expout = (struct expression *)
xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size));
expout->language_defn = current_language;
- make_cleanup (free_current_contents, &expout);
+ expout->gdbarch = current_gdbarch;
- if (current_language->la_parser ())
- current_language->la_error (NULL);
+ TRY_CATCH (except, RETURN_MASK_ALL)
+ {
+ if (current_language->la_parser ())
+ current_language->la_error (NULL);
+ }
+ if (except.reason < 0)
+ {
+ if (! in_parse_field)
+ {
+ xfree (expout);
+ throw_exception (except);
+ }
+ }
discard_cleanups (old_chain);
dump_raw_expression (expout, gdb_stdlog,
"before conversion to prefix form");
- prefixify_expression (expout);
+ subexp = prefixify_expression (expout);
+ if (out_subexp)
+ *out_subexp = subexp;
current_language->la_post_parser (&expout, void_context_p);
return exp;
}
+/* 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. In all other cases, return NULL.
+ Returned non-NULL *NAME must be freed by the caller. */
+
+struct type *
+parse_field_expression (char *string, char **name)
+{
+ struct expression *exp = NULL;
+ struct value *val;
+ int subexp;
+ volatile struct gdb_exception except;
+
+ TRY_CATCH (except, RETURN_MASK_ALL)
+ {
+ in_parse_field = 1;
+ exp = parse_exp_in_context (&string, 0, 0, 0, &subexp);
+ }
+ in_parse_field = 0;
+ if (except.reason < 0 || ! exp)
+ return NULL;
+ if (expout_last_struct == -1)
+ {
+ xfree (exp);
+ return NULL;
+ }
+
+ *name = extract_field_op (exp, &subexp);
+ if (!*name)
+ {
+ xfree (exp);
+ return NULL;
+ }
+ /* (*NAME) is a part of the EXP memory block freed below. */
+ *name = xstrdup (*name);
+
+ val = evaluate_subexpression_type (exp, subexp);
+ xfree (exp);
+
+ return value_type (val);
+}
+
/* A post-parser that does nothing */
void
done with it. */
range_type =
create_range_type ((struct type *) NULL,
- builtin_type_int, 0,
+ builtin_type_int32, 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;
+ TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (follow_type) = 1;
break;
case tp_function:
/* FIXME-type-allocation: need a way to free this type when we are
projects / deliverable / binutils-gdb.git / blobdiff