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/* Dwarf2 Expression Evaluator
Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
Contributed by Daniel Berlin (dan@dberlin.org)
This file is part of GDB.
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
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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. */
#if !defined (DWARF2EXPR_H)
#define DWARF2EXPR_H
/* The expression evaluator works with a dwarf_expr_context, describing
its current state and its callbacks. */
struct dwarf_expr_context
{
/* The stack of values, allocated with xmalloc. */
CORE_ADDR *stack;
/* The number of values currently pushed on the stack, and the
number of elements allocated to the stack. */
int stack_len, stack_allocated;
/* An opaque argument provided by the caller, which will be passed
to all of the callback functions. */
void *baton;
/* Return the value of register number REGNUM. LVALP will be set
to the kind of lval this register is (generally lval_register
for the current frame's registers or lval_memory for a register
saved to the stack). For lval_memory ADDRP will be set to the
saved location of the register. */
CORE_ADDR (*read_reg) (void *baton, int regnum, enum lval_type *lvalp,
CORE_ADDR *addrp);
/* Read LENGTH bytes at ADDR into BUF. */
void (*read_mem) (void *baton, char *buf, CORE_ADDR addr,
size_t length);
/* Return the location expression for the frame base attribute, in
START and LENGTH. The result must be live until the current
expression evaluation is complete. */
void (*get_frame_base) (void *baton, unsigned char **start,
size_t *length);
/* Return the thread-local storage address for
DW_OP_GNU_push_tls_address. */
CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset);
#if 0
/* Not yet implemented. */
/* Return the location expression for the dwarf expression
subroutine in the die at OFFSET in the current compilation unit.
The result must be live until the current expression evaluation
is complete. */
unsigned char *(*get_subr) (void *baton, off_t offset, size_t *length);
/* Return the `object address' for DW_OP_push_object_address. */
CORE_ADDR (*get_object_address) (void *baton);
#endif
/* The current depth of dwarf expression recursion, via DW_OP_call*,
DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum
depth we'll tolerate before raising an error. */
int recursion_depth, max_recursion_depth;
/* Non-zero if the result is in a register. The register number
will be in REGNUM, and the result will be the contents of the
register. */
int in_reg;
/* If the result is in a register, the register number. */
int regnum;
};
struct dwarf_expr_context *new_dwarf_expr_context ();
void free_dwarf_expr_context (struct dwarf_expr_context *ctx);
void dwarf_expr_push (struct dwarf_expr_context *ctx, CORE_ADDR value);
void dwarf_expr_pop (struct dwarf_expr_context *ctx);
void dwarf_expr_eval (struct dwarf_expr_context *ctx, unsigned char *addr,
size_t len);
CORE_ADDR dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n);
unsigned char *read_uleb128 (unsigned char *buf, unsigned char *buf_end,
ULONGEST * r);
unsigned char *read_sleb128 (unsigned char *buf, unsigned char *buf_end,
LONGEST * r);
#endif
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