104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/* Dwarf2 Expression Evaluator
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Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
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Contributed by Daniel Berlin (dan@dberlin.org)
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#if !defined (DWARF2EXPR_H)
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#define DWARF2EXPR_H
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/* The expression evaluator works with a dwarf_expr_context, describing
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its current state and its callbacks. */
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struct dwarf_expr_context
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{
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/* The stack of values, allocated with xmalloc. */
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CORE_ADDR *stack;
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/* The number of values currently pushed on the stack, and the
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number of elements allocated to the stack. */
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int stack_len, stack_allocated;
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/* An opaque argument provided by the caller, which will be passed
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to all of the callback functions. */
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void *baton;
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/* Return the value of register number REGNUM. LVALP will be set
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to the kind of lval this register is (generally lval_register
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for the current frame's registers or lval_memory for a register
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saved to the stack). For lval_memory ADDRP will be set to the
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saved location of the register. */
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CORE_ADDR (*read_reg) (void *baton, int regnum, enum lval_type *lvalp,
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CORE_ADDR *addrp);
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/* Read LENGTH bytes at ADDR into BUF. */
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void (*read_mem) (void *baton, char *buf, CORE_ADDR addr,
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size_t length);
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/* Return the location expression for the frame base attribute, in
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START and LENGTH. The result must be live until the current
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expression evaluation is complete. */
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void (*get_frame_base) (void *baton, unsigned char **start,
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size_t *length);
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/* Return the thread-local storage address for
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DW_OP_GNU_push_tls_address. */
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CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset);
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#if 0
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/* Not yet implemented. */
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/* Return the location expression for the dwarf expression
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subroutine in the die at OFFSET in the current compilation unit.
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The result must be live until the current expression evaluation
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is complete. */
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unsigned char *(*get_subr) (void *baton, off_t offset, size_t *length);
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/* Return the `object address' for DW_OP_push_object_address. */
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CORE_ADDR (*get_object_address) (void *baton);
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#endif
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/* The current depth of dwarf expression recursion, via DW_OP_call*,
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DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum
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depth we'll tolerate before raising an error. */
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int recursion_depth, max_recursion_depth;
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/* Non-zero if the result is in a register. The register number
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will be in REGNUM, and the result will be the contents of the
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register. */
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int in_reg;
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/* If the result is in a register, the register number. */
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int regnum;
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};
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struct dwarf_expr_context *new_dwarf_expr_context ();
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void free_dwarf_expr_context (struct dwarf_expr_context *ctx);
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void dwarf_expr_push (struct dwarf_expr_context *ctx, CORE_ADDR value);
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void dwarf_expr_pop (struct dwarf_expr_context *ctx);
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void dwarf_expr_eval (struct dwarf_expr_context *ctx, unsigned char *addr,
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size_t len);
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CORE_ADDR dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n);
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unsigned char *read_uleb128 (unsigned char *buf, unsigned char *buf_end,
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ULONGEST * r);
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unsigned char *read_sleb128 (unsigned char *buf, unsigned char *buf_end,
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LONGEST * r);
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#endif
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