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* dbxread.c: White space. * dcache.c: White space. * disasm.c: White space. * doublest.c: White space. * dsrec.c: White space. * dummy-frame.c: White space. * dwarf2expr.c: White space. * dwarf2-frame.c: White space. * dwarf2loc.c: White space. * dwarf2read.c: White space.
1304 lines
36 KiB
C
1304 lines
36 KiB
C
/* DWARF 2 location expression support for GDB.
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Copyright (C) 2003, 2005, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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Contributed by Daniel Jacobowitz, MontaVista Software, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "ui-out.h"
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#include "value.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "inferior.h"
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#include "ax.h"
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#include "ax-gdb.h"
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#include "regcache.h"
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#include "objfiles.h"
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#include "exceptions.h"
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#include "block.h"
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#include "dwarf2.h"
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#include "dwarf2expr.h"
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#include "dwarf2loc.h"
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#include "dwarf2-frame.h"
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#include "gdb_string.h"
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#include "gdb_assert.h"
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static void
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dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc,
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gdb_byte **start, size_t *length);
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/* A helper function for dealing with location lists. Given a
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symbol baton (BATON) and a pc value (PC), find the appropriate
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location expression, set *LOCEXPR_LENGTH, and return a pointer
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to the beginning of the expression. Returns NULL on failure.
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For now, only return the first matching location expression; there
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can be more than one in the list. */
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static gdb_byte *
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find_location_expression (struct dwarf2_loclist_baton *baton,
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size_t *locexpr_length, CORE_ADDR pc)
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{
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CORE_ADDR low, high;
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gdb_byte *loc_ptr, *buf_end;
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int length;
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struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu);
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struct gdbarch *gdbarch = get_objfile_arch (objfile);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu);
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CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
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/* Adjust base_address for relocatable objects. */
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CORE_ADDR base_offset = ANOFFSET (objfile->section_offsets,
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SECT_OFF_TEXT (objfile));
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CORE_ADDR base_address = baton->base_address + base_offset;
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loc_ptr = baton->data;
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buf_end = baton->data + baton->size;
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while (1)
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{
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if (buf_end - loc_ptr < 2 * addr_size)
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error (_("find_location_expression: Corrupted DWARF expression."));
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low = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
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loc_ptr += addr_size;
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/* A base-address-selection entry. */
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if (low == base_mask)
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{
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base_address = dwarf2_read_address (gdbarch,
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loc_ptr, buf_end, addr_size);
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loc_ptr += addr_size;
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continue;
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}
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high = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
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loc_ptr += addr_size;
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/* An end-of-list entry. */
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if (low == 0 && high == 0)
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return NULL;
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/* Otherwise, a location expression entry. */
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low += base_address;
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high += base_address;
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length = extract_unsigned_integer (loc_ptr, 2, byte_order);
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loc_ptr += 2;
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if (pc >= low && pc < high)
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{
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*locexpr_length = length;
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return loc_ptr;
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}
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loc_ptr += length;
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}
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}
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/* This is the baton used when performing dwarf2 expression
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evaluation. */
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struct dwarf_expr_baton
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{
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struct frame_info *frame;
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struct objfile *objfile;
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};
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/* Helper functions for dwarf2_evaluate_loc_desc. */
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/* Using the frame specified in BATON, return the value of register
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REGNUM, treated as a pointer. */
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static CORE_ADDR
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dwarf_expr_read_reg (void *baton, int dwarf_regnum)
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{
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struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
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struct gdbarch *gdbarch = get_frame_arch (debaton->frame);
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CORE_ADDR result;
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int regnum;
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regnum = gdbarch_dwarf2_reg_to_regnum (gdbarch, dwarf_regnum);
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result = address_from_register (builtin_type (gdbarch)->builtin_data_ptr,
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regnum, debaton->frame);
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return result;
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}
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/* Read memory at ADDR (length LEN) into BUF. */
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static void
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dwarf_expr_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len)
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{
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read_memory (addr, buf, len);
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}
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/* Using the frame specified in BATON, find the location expression
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describing the frame base. Return a pointer to it in START and
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its length in LENGTH. */
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static void
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dwarf_expr_frame_base (void *baton, gdb_byte **start, size_t * length)
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{
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/* FIXME: cagney/2003-03-26: This code should be using
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get_frame_base_address(), and then implement a dwarf2 specific
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this_base method. */
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struct symbol *framefunc;
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struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
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/* Use block_linkage_function, which returns a real (not inlined)
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function, instead of get_frame_function, which may return an
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inlined function. */
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framefunc = block_linkage_function (get_frame_block (debaton->frame, NULL));
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/* If we found a frame-relative symbol then it was certainly within
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some function associated with a frame. If we can't find the frame,
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something has gone wrong. */
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gdb_assert (framefunc != NULL);
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dwarf_expr_frame_base_1 (framefunc,
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get_frame_address_in_block (debaton->frame),
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start, length);
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}
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static void
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dwarf_expr_frame_base_1 (struct symbol *framefunc, CORE_ADDR pc,
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gdb_byte **start, size_t *length)
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{
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if (SYMBOL_LOCATION_BATON (framefunc) == NULL)
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*start = NULL;
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else if (SYMBOL_COMPUTED_OPS (framefunc) == &dwarf2_loclist_funcs)
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{
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struct dwarf2_loclist_baton *symbaton;
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symbaton = SYMBOL_LOCATION_BATON (framefunc);
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*start = find_location_expression (symbaton, length, pc);
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}
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else
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{
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struct dwarf2_locexpr_baton *symbaton;
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symbaton = SYMBOL_LOCATION_BATON (framefunc);
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if (symbaton != NULL)
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{
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*length = symbaton->size;
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*start = symbaton->data;
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}
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else
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*start = NULL;
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}
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if (*start == NULL)
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error (_("Could not find the frame base for \"%s\"."),
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SYMBOL_NATURAL_NAME (framefunc));
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}
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/* Helper function for dwarf2_evaluate_loc_desc. Computes the CFA for
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the frame in BATON. */
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static CORE_ADDR
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dwarf_expr_frame_cfa (void *baton)
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{
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struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
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return dwarf2_frame_cfa (debaton->frame);
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}
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/* Using the objfile specified in BATON, find the address for the
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current thread's thread-local storage with offset OFFSET. */
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static CORE_ADDR
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dwarf_expr_tls_address (void *baton, CORE_ADDR offset)
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{
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struct dwarf_expr_baton *debaton = (struct dwarf_expr_baton *) baton;
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return target_translate_tls_address (debaton->objfile, offset);
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}
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struct piece_closure
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{
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/* The number of pieces used to describe this variable. */
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int n_pieces;
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/* The target address size, used only for DWARF_VALUE_STACK. */
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int addr_size;
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/* The pieces themselves. */
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struct dwarf_expr_piece *pieces;
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};
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/* Allocate a closure for a value formed from separately-described
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PIECES. */
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static struct piece_closure *
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allocate_piece_closure (int n_pieces, struct dwarf_expr_piece *pieces,
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int addr_size)
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{
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struct piece_closure *c = XZALLOC (struct piece_closure);
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c->n_pieces = n_pieces;
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c->addr_size = addr_size;
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c->pieces = XCALLOC (n_pieces, struct dwarf_expr_piece);
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memcpy (c->pieces, pieces, n_pieces * sizeof (struct dwarf_expr_piece));
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return c;
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}
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static void
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read_pieced_value (struct value *v)
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{
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int i;
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long offset = 0;
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gdb_byte *contents;
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struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
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struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (v));
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contents = value_contents_raw (v);
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for (i = 0; i < c->n_pieces; i++)
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{
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struct dwarf_expr_piece *p = &c->pieces[i];
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switch (p->location)
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{
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case DWARF_VALUE_REGISTER:
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{
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struct gdbarch *arch = get_frame_arch (frame);
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int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch,
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p->v.expr.value);
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int reg_offset = 0;
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if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
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&& p->size < register_size (arch, gdb_regnum))
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/* Big-endian, and we want less than full size. */
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reg_offset = register_size (arch, gdb_regnum) - p->size;
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if (gdb_regnum != -1)
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{
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get_frame_register_bytes (frame, gdb_regnum, reg_offset,
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p->size, contents + offset);
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}
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else
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{
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error (_("Unable to access DWARF register number %s"),
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paddress (arch, p->v.expr.value));
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}
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}
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break;
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case DWARF_VALUE_MEMORY:
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if (p->v.expr.in_stack_memory)
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read_stack (p->v.expr.value, contents + offset, p->size);
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else
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read_memory (p->v.expr.value, contents + offset, p->size);
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break;
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case DWARF_VALUE_STACK:
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{
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struct gdbarch *gdbarch = get_type_arch (value_type (v));
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size_t n = p->size;
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if (n > c->addr_size)
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n = c->addr_size;
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store_unsigned_integer (contents + offset, n,
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gdbarch_byte_order (gdbarch),
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p->v.expr.value);
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}
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break;
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case DWARF_VALUE_LITERAL:
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{
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size_t n = p->size;
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if (n > p->v.literal.length)
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n = p->v.literal.length;
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memcpy (contents + offset, p->v.literal.data, n);
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}
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break;
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default:
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internal_error (__FILE__, __LINE__, _("invalid location type"));
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}
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offset += p->size;
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}
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}
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static void
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write_pieced_value (struct value *to, struct value *from)
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{
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int i;
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long offset = 0;
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gdb_byte *contents;
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struct piece_closure *c = (struct piece_closure *) value_computed_closure (to);
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struct frame_info *frame = frame_find_by_id (VALUE_FRAME_ID (to));
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if (frame == NULL)
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{
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set_value_optimized_out (to, 1);
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return;
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}
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contents = value_contents_raw (from);
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for (i = 0; i < c->n_pieces; i++)
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{
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struct dwarf_expr_piece *p = &c->pieces[i];
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switch (p->location)
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{
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case DWARF_VALUE_REGISTER:
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{
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struct gdbarch *arch = get_frame_arch (frame);
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int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, p->v.expr.value);
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int reg_offset = 0;
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if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG
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&& p->size < register_size (arch, gdb_regnum))
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/* Big-endian, and we want less than full size. */
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reg_offset = register_size (arch, gdb_regnum) - p->size;
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if (gdb_regnum != -1)
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{
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put_frame_register_bytes (frame, gdb_regnum, reg_offset,
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p->size, contents + offset);
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}
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else
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{
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error (_("Unable to write to DWARF register number %s"),
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paddress (arch, p->v.expr.value));
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}
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}
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break;
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case DWARF_VALUE_MEMORY:
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write_memory (p->v.expr.value, contents + offset, p->size);
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break;
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default:
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set_value_optimized_out (to, 1);
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return;
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}
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offset += p->size;
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}
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}
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static void *
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copy_pieced_value_closure (struct value *v)
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{
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struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
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return allocate_piece_closure (c->n_pieces, c->pieces, c->addr_size);
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}
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static void
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free_pieced_value_closure (struct value *v)
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{
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struct piece_closure *c = (struct piece_closure *) value_computed_closure (v);
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xfree (c->pieces);
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xfree (c);
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}
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/* Functions for accessing a variable described by DW_OP_piece. */
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static struct lval_funcs pieced_value_funcs = {
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read_pieced_value,
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write_pieced_value,
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copy_pieced_value_closure,
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free_pieced_value_closure
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};
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/* Evaluate a location description, starting at DATA and with length
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SIZE, to find the current location of variable of TYPE in the context
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of FRAME. */
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static struct value *
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dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
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gdb_byte *data, unsigned short size,
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struct dwarf2_per_cu_data *per_cu)
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{
|
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struct value *retval;
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struct dwarf_expr_baton baton;
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struct dwarf_expr_context *ctx;
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struct cleanup *old_chain;
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|
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if (size == 0)
|
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{
|
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retval = allocate_value (type);
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VALUE_LVAL (retval) = not_lval;
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set_value_optimized_out (retval, 1);
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return retval;
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}
|
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|
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baton.frame = frame;
|
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baton.objfile = dwarf2_per_cu_objfile (per_cu);
|
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|
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ctx = new_dwarf_expr_context ();
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old_chain = make_cleanup_free_dwarf_expr_context (ctx);
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|
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ctx->gdbarch = get_objfile_arch (baton.objfile);
|
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ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
|
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ctx->baton = &baton;
|
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ctx->read_reg = dwarf_expr_read_reg;
|
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ctx->read_mem = dwarf_expr_read_mem;
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ctx->get_frame_base = dwarf_expr_frame_base;
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ctx->get_frame_cfa = dwarf_expr_frame_cfa;
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ctx->get_tls_address = dwarf_expr_tls_address;
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||
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dwarf_expr_eval (ctx, data, size);
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if (ctx->num_pieces > 0)
|
||
{
|
||
struct piece_closure *c;
|
||
struct frame_id frame_id = get_frame_id (frame);
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||
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c = allocate_piece_closure (ctx->num_pieces, ctx->pieces,
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ctx->addr_size);
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retval = allocate_computed_value (type, &pieced_value_funcs, c);
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VALUE_FRAME_ID (retval) = frame_id;
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}
|
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else
|
||
{
|
||
switch (ctx->location)
|
||
{
|
||
case DWARF_VALUE_REGISTER:
|
||
{
|
||
struct gdbarch *arch = get_frame_arch (frame);
|
||
CORE_ADDR dwarf_regnum = dwarf_expr_fetch (ctx, 0);
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int gdb_regnum = gdbarch_dwarf2_reg_to_regnum (arch, dwarf_regnum);
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|
||
if (gdb_regnum != -1)
|
||
retval = value_from_register (type, gdb_regnum, frame);
|
||
else
|
||
error (_("Unable to access DWARF register number %s"),
|
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paddress (arch, dwarf_regnum));
|
||
}
|
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break;
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||
|
||
case DWARF_VALUE_MEMORY:
|
||
{
|
||
CORE_ADDR address = dwarf_expr_fetch (ctx, 0);
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||
int in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
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||
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retval = allocate_value (type);
|
||
VALUE_LVAL (retval) = lval_memory;
|
||
set_value_lazy (retval, 1);
|
||
if (in_stack_memory)
|
||
set_value_stack (retval, 1);
|
||
set_value_address (retval, address);
|
||
}
|
||
break;
|
||
|
||
case DWARF_VALUE_STACK:
|
||
{
|
||
ULONGEST value = (ULONGEST) dwarf_expr_fetch (ctx, 0);
|
||
bfd_byte *contents;
|
||
size_t n = ctx->addr_size;
|
||
|
||
retval = allocate_value (type);
|
||
contents = value_contents_raw (retval);
|
||
if (n > TYPE_LENGTH (type))
|
||
n = TYPE_LENGTH (type);
|
||
store_unsigned_integer (contents, n,
|
||
gdbarch_byte_order (ctx->gdbarch),
|
||
value);
|
||
}
|
||
break;
|
||
|
||
case DWARF_VALUE_LITERAL:
|
||
{
|
||
bfd_byte *contents;
|
||
size_t n = ctx->len;
|
||
|
||
retval = allocate_value (type);
|
||
contents = value_contents_raw (retval);
|
||
if (n > TYPE_LENGTH (type))
|
||
n = TYPE_LENGTH (type);
|
||
memcpy (contents, ctx->data, n);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
internal_error (__FILE__, __LINE__, _("invalid location type"));
|
||
}
|
||
}
|
||
|
||
set_value_initialized (retval, ctx->initialized);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return retval;
|
||
}
|
||
|
||
/* Helper functions and baton for dwarf2_loc_desc_needs_frame. */
|
||
|
||
struct needs_frame_baton
|
||
{
|
||
int needs_frame;
|
||
};
|
||
|
||
/* Reads from registers do require a frame. */
|
||
static CORE_ADDR
|
||
needs_frame_read_reg (void *baton, int regnum)
|
||
{
|
||
struct needs_frame_baton *nf_baton = baton;
|
||
|
||
nf_baton->needs_frame = 1;
|
||
return 1;
|
||
}
|
||
|
||
/* Reads from memory do not require a frame. */
|
||
static void
|
||
needs_frame_read_mem (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t len)
|
||
{
|
||
memset (buf, 0, len);
|
||
}
|
||
|
||
/* Frame-relative accesses do require a frame. */
|
||
static void
|
||
needs_frame_frame_base (void *baton, gdb_byte **start, size_t * length)
|
||
{
|
||
static gdb_byte lit0 = DW_OP_lit0;
|
||
struct needs_frame_baton *nf_baton = baton;
|
||
|
||
*start = &lit0;
|
||
*length = 1;
|
||
|
||
nf_baton->needs_frame = 1;
|
||
}
|
||
|
||
/* CFA accesses require a frame. */
|
||
|
||
static CORE_ADDR
|
||
needs_frame_frame_cfa (void *baton)
|
||
{
|
||
struct needs_frame_baton *nf_baton = baton;
|
||
|
||
nf_baton->needs_frame = 1;
|
||
return 1;
|
||
}
|
||
|
||
/* Thread-local accesses do require a frame. */
|
||
static CORE_ADDR
|
||
needs_frame_tls_address (void *baton, CORE_ADDR offset)
|
||
{
|
||
struct needs_frame_baton *nf_baton = baton;
|
||
|
||
nf_baton->needs_frame = 1;
|
||
return 1;
|
||
}
|
||
|
||
/* Return non-zero iff the location expression at DATA (length SIZE)
|
||
requires a frame to evaluate. */
|
||
|
||
static int
|
||
dwarf2_loc_desc_needs_frame (gdb_byte *data, unsigned short size,
|
||
struct dwarf2_per_cu_data *per_cu)
|
||
{
|
||
struct needs_frame_baton baton;
|
||
struct dwarf_expr_context *ctx;
|
||
int in_reg;
|
||
struct cleanup *old_chain;
|
||
|
||
baton.needs_frame = 0;
|
||
|
||
ctx = new_dwarf_expr_context ();
|
||
old_chain = make_cleanup_free_dwarf_expr_context (ctx);
|
||
|
||
ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
|
||
ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
|
||
ctx->baton = &baton;
|
||
ctx->read_reg = needs_frame_read_reg;
|
||
ctx->read_mem = needs_frame_read_mem;
|
||
ctx->get_frame_base = needs_frame_frame_base;
|
||
ctx->get_frame_cfa = needs_frame_frame_cfa;
|
||
ctx->get_tls_address = needs_frame_tls_address;
|
||
|
||
dwarf_expr_eval (ctx, data, size);
|
||
|
||
in_reg = ctx->location == DWARF_VALUE_REGISTER;
|
||
|
||
if (ctx->num_pieces > 0)
|
||
{
|
||
int i;
|
||
|
||
/* If the location has several pieces, and any of them are in
|
||
registers, then we will need a frame to fetch them from. */
|
||
for (i = 0; i < ctx->num_pieces; i++)
|
||
if (ctx->pieces[i].location == DWARF_VALUE_REGISTER)
|
||
in_reg = 1;
|
||
}
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return baton.needs_frame || in_reg;
|
||
}
|
||
|
||
/* This struct keeps track of the pieces that make up a multi-location
|
||
object, for use in agent expression generation. It is
|
||
superficially similar to struct dwarf_expr_piece, but
|
||
dwarf_expr_piece is designed for use in immediate evaluation, and
|
||
does not, for example, have a way to record both base register and
|
||
offset. */
|
||
|
||
struct axs_var_loc
|
||
{
|
||
/* Memory vs register, etc */
|
||
enum axs_lvalue_kind kind;
|
||
|
||
/* If non-zero, number of bytes in this fragment */
|
||
unsigned bytes;
|
||
|
||
/* (GDB-numbered) reg, or base reg if >= 0 */
|
||
int reg;
|
||
|
||
/* offset from reg */
|
||
LONGEST offset;
|
||
};
|
||
|
||
static gdb_byte *
|
||
dwarf2_tracepoint_var_loc (struct symbol *symbol,
|
||
struct agent_expr *ax,
|
||
struct axs_var_loc *loc,
|
||
struct gdbarch *gdbarch,
|
||
gdb_byte *data, gdb_byte *end)
|
||
{
|
||
if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31)
|
||
{
|
||
loc->kind = axs_lvalue_register;
|
||
loc->reg = gdbarch_dwarf2_reg_to_regnum (gdbarch, data[0] - DW_OP_reg0);
|
||
data += 1;
|
||
}
|
||
else if (data[0] == DW_OP_regx)
|
||
{
|
||
ULONGEST reg;
|
||
|
||
data = read_uleb128 (data + 1, end, ®);
|
||
loc->kind = axs_lvalue_register;
|
||
loc->reg = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg);
|
||
}
|
||
else if (data[0] == DW_OP_fbreg)
|
||
{
|
||
struct block *b;
|
||
struct symbol *framefunc;
|
||
int frame_reg = 0;
|
||
LONGEST frame_offset;
|
||
gdb_byte *base_data;
|
||
size_t base_size;
|
||
LONGEST base_offset = 0;
|
||
|
||
b = block_for_pc (ax->scope);
|
||
|
||
if (!b)
|
||
error (_("No block found for address"));
|
||
|
||
framefunc = block_linkage_function (b);
|
||
|
||
if (!framefunc)
|
||
error (_("No function found for block"));
|
||
|
||
dwarf_expr_frame_base_1 (framefunc, ax->scope,
|
||
&base_data, &base_size);
|
||
|
||
if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31)
|
||
{
|
||
gdb_byte *buf_end;
|
||
|
||
frame_reg = base_data[0] - DW_OP_breg0;
|
||
buf_end = read_sleb128 (base_data + 1,
|
||
base_data + base_size, &base_offset);
|
||
if (buf_end != base_data + base_size)
|
||
error (_("Unexpected opcode after DW_OP_breg%u for symbol \"%s\"."),
|
||
frame_reg, SYMBOL_PRINT_NAME (symbol));
|
||
}
|
||
else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31)
|
||
{
|
||
/* The frame base is just the register, with no offset. */
|
||
frame_reg = base_data[0] - DW_OP_reg0;
|
||
base_offset = 0;
|
||
}
|
||
else
|
||
{
|
||
/* We don't know what to do with the frame base expression,
|
||
so we can't trace this variable; give up. */
|
||
error (_("Cannot generate expression to collect symbol \"%s\"; DWARF 2 encoding not handled, first opcode in base data is 0x%x."),
|
||
SYMBOL_PRINT_NAME (symbol), base_data[0]);
|
||
}
|
||
|
||
data = read_sleb128 (data + 1, end, &frame_offset);
|
||
|
||
loc->kind = axs_lvalue_memory;
|
||
loc->reg = gdbarch_dwarf2_reg_to_regnum (gdbarch, frame_reg);
|
||
loc->offset = base_offset + frame_offset;
|
||
}
|
||
else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31)
|
||
{
|
||
unsigned int reg;
|
||
LONGEST offset;
|
||
|
||
reg = data[0] - DW_OP_breg0;
|
||
data = read_sleb128 (data + 1, end, &offset);
|
||
|
||
loc->kind = axs_lvalue_memory;
|
||
loc->reg = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg);
|
||
loc->offset = offset;
|
||
}
|
||
else
|
||
error (_("Unsupported DWARF opcode 0x%x in the location of \"%s\"."),
|
||
data[0], SYMBOL_PRINT_NAME (symbol));
|
||
|
||
return data;
|
||
}
|
||
|
||
/* Given the location of a piece, issue bytecodes that will access it. */
|
||
|
||
static void
|
||
dwarf2_tracepoint_var_access (struct agent_expr *ax,
|
||
struct axs_value *value,
|
||
struct axs_var_loc *loc)
|
||
{
|
||
value->kind = loc->kind;
|
||
|
||
switch (loc->kind)
|
||
{
|
||
case axs_lvalue_register:
|
||
value->u.reg = loc->reg;
|
||
break;
|
||
|
||
case axs_lvalue_memory:
|
||
ax_reg (ax, loc->reg);
|
||
if (loc->offset)
|
||
{
|
||
ax_const_l (ax, loc->offset);
|
||
ax_simple (ax, aop_add);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
internal_error (__FILE__, __LINE__, _("Unhandled value kind in dwarf2_tracepoint_var_access"));
|
||
}
|
||
}
|
||
|
||
static void
|
||
dwarf2_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
|
||
struct agent_expr *ax, struct axs_value *value,
|
||
gdb_byte *data, int size)
|
||
{
|
||
gdb_byte *end = data + size;
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
/* In practice, a variable is not going to be spread across
|
||
dozens of registers or memory locations. If someone comes up
|
||
with a real-world example, revisit this. */
|
||
#define MAX_FRAGS 16
|
||
struct axs_var_loc fragments[MAX_FRAGS];
|
||
int nfrags = 0, frag;
|
||
int length = 0;
|
||
int piece_ok = 0;
|
||
int bad = 0;
|
||
int first = 1;
|
||
|
||
if (!data || size == 0)
|
||
{
|
||
value->optimized_out = 1;
|
||
return;
|
||
}
|
||
|
||
while (data < end)
|
||
{
|
||
if (!piece_ok)
|
||
{
|
||
if (nfrags == MAX_FRAGS)
|
||
error (_("Too many pieces in location for \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
|
||
fragments[nfrags].bytes = 0;
|
||
data = dwarf2_tracepoint_var_loc (symbol, ax, &fragments[nfrags],
|
||
gdbarch, data, end);
|
||
nfrags++;
|
||
piece_ok = 1;
|
||
}
|
||
else if (data[0] == DW_OP_piece)
|
||
{
|
||
ULONGEST bytes;
|
||
|
||
data = read_uleb128 (data + 1, end, &bytes);
|
||
/* Only deal with 4 byte fragments for now. */
|
||
if (bytes != 4)
|
||
error (_("DW_OP_piece %s not supported in location for \"%s\"."),
|
||
pulongest (bytes), SYMBOL_PRINT_NAME (symbol));
|
||
fragments[nfrags - 1].bytes = bytes;
|
||
length += bytes;
|
||
piece_ok = 0;
|
||
}
|
||
else
|
||
{
|
||
bad = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (bad || data > end)
|
||
error (_("Corrupted DWARF expression for \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
|
||
/* If single expression, no pieces, convert to external format. */
|
||
if (length == 0)
|
||
{
|
||
dwarf2_tracepoint_var_access (ax, value, &fragments[0]);
|
||
return;
|
||
}
|
||
|
||
if (length != TYPE_LENGTH (value->type))
|
||
error (_("Inconsistent piece information for \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
|
||
/* Emit bytecodes to assemble the pieces into a single stack entry. */
|
||
|
||
for ((frag = (byte_order == BFD_ENDIAN_BIG ? 0 : nfrags - 1));
|
||
nfrags--;
|
||
(frag += (byte_order == BFD_ENDIAN_BIG ? 1 : -1)))
|
||
{
|
||
if (!first)
|
||
{
|
||
/* shift the previous fragment up 32 bits */
|
||
ax_const_l (ax, 32);
|
||
ax_simple (ax, aop_lsh);
|
||
}
|
||
|
||
dwarf2_tracepoint_var_access (ax, value, &fragments[frag]);
|
||
|
||
switch (value->kind)
|
||
{
|
||
case axs_lvalue_register:
|
||
ax_reg (ax, value->u.reg);
|
||
break;
|
||
|
||
case axs_lvalue_memory:
|
||
{
|
||
extern int trace_kludge; /* Ugh. */
|
||
|
||
gdb_assert (fragments[frag].bytes == 4);
|
||
if (trace_kludge)
|
||
ax_trace_quick (ax, 4);
|
||
ax_simple (ax, aop_ref32);
|
||
}
|
||
break;
|
||
}
|
||
|
||
if (!first)
|
||
{
|
||
/* or the new fragment into the previous */
|
||
ax_zero_ext (ax, 32);
|
||
ax_simple (ax, aop_bit_or);
|
||
}
|
||
first = 0;
|
||
}
|
||
value->kind = axs_rvalue;
|
||
}
|
||
|
||
|
||
/* Return the value of SYMBOL in FRAME using the DWARF-2 expression
|
||
evaluator to calculate the location. */
|
||
static struct value *
|
||
locexpr_read_variable (struct symbol *symbol, struct frame_info *frame)
|
||
{
|
||
struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
struct value *val;
|
||
|
||
val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, dlbaton->data,
|
||
dlbaton->size, dlbaton->per_cu);
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Return non-zero iff we need a frame to evaluate SYMBOL. */
|
||
static int
|
||
locexpr_read_needs_frame (struct symbol *symbol)
|
||
{
|
||
struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
|
||
return dwarf2_loc_desc_needs_frame (dlbaton->data, dlbaton->size,
|
||
dlbaton->per_cu);
|
||
}
|
||
|
||
/* Describe a single piece of a location, returning an updated
|
||
position in the bytecode sequence. */
|
||
|
||
static gdb_byte *
|
||
locexpr_describe_location_piece (struct symbol *symbol, struct ui_file *stream,
|
||
CORE_ADDR addr, struct objfile *objfile,
|
||
gdb_byte *data, int size, unsigned int addr_size)
|
||
{
|
||
struct gdbarch *gdbarch = get_objfile_arch (objfile);
|
||
int regno;
|
||
|
||
if (data[0] >= DW_OP_reg0 && data[0] <= DW_OP_reg31)
|
||
{
|
||
regno = gdbarch_dwarf2_reg_to_regnum (gdbarch, data[0] - DW_OP_reg0);
|
||
fprintf_filtered (stream, _("a variable in $%s"),
|
||
gdbarch_register_name (gdbarch, regno));
|
||
data += 1;
|
||
}
|
||
else if (data[0] == DW_OP_regx)
|
||
{
|
||
ULONGEST reg;
|
||
|
||
data = read_uleb128 (data + 1, data + size, ®);
|
||
regno = gdbarch_dwarf2_reg_to_regnum (gdbarch, reg);
|
||
fprintf_filtered (stream, _("a variable in $%s"),
|
||
gdbarch_register_name (gdbarch, regno));
|
||
}
|
||
else if (data[0] == DW_OP_fbreg)
|
||
{
|
||
struct block *b;
|
||
struct symbol *framefunc;
|
||
int frame_reg = 0;
|
||
LONGEST frame_offset;
|
||
gdb_byte *base_data;
|
||
size_t base_size;
|
||
LONGEST base_offset = 0;
|
||
|
||
b = block_for_pc (addr);
|
||
|
||
if (!b)
|
||
error (_("No block found for address for symbol \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
|
||
framefunc = block_linkage_function (b);
|
||
|
||
if (!framefunc)
|
||
error (_("No function found for block for symbol \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
|
||
dwarf_expr_frame_base_1 (framefunc, addr, &base_data, &base_size);
|
||
|
||
if (base_data[0] >= DW_OP_breg0 && base_data[0] <= DW_OP_breg31)
|
||
{
|
||
gdb_byte *buf_end;
|
||
|
||
frame_reg = base_data[0] - DW_OP_breg0;
|
||
buf_end = read_sleb128 (base_data + 1,
|
||
base_data + base_size, &base_offset);
|
||
if (buf_end != base_data + base_size)
|
||
error (_("Unexpected opcode after DW_OP_breg%u for symbol \"%s\"."),
|
||
frame_reg, SYMBOL_PRINT_NAME (symbol));
|
||
}
|
||
else if (base_data[0] >= DW_OP_reg0 && base_data[0] <= DW_OP_reg31)
|
||
{
|
||
/* The frame base is just the register, with no offset. */
|
||
frame_reg = base_data[0] - DW_OP_reg0;
|
||
base_offset = 0;
|
||
}
|
||
else
|
||
{
|
||
/* We don't know what to do with the frame base expression,
|
||
so we can't trace this variable; give up. */
|
||
error (_("Cannot describe location of symbol \"%s\"; "
|
||
"DWARF 2 encoding not handled, "
|
||
"first opcode in base data is 0x%x."),
|
||
SYMBOL_PRINT_NAME (symbol), base_data[0]);
|
||
}
|
||
|
||
regno = gdbarch_dwarf2_reg_to_regnum (gdbarch, frame_reg);
|
||
|
||
data = read_sleb128 (data + 1, data + size, &frame_offset);
|
||
|
||
fprintf_filtered (stream, _("a variable at frame base reg $%s offset %s+%s"),
|
||
gdbarch_register_name (gdbarch, regno),
|
||
plongest (base_offset), plongest (frame_offset));
|
||
}
|
||
else if (data[0] >= DW_OP_breg0 && data[0] <= DW_OP_breg31)
|
||
{
|
||
LONGEST offset;
|
||
|
||
regno = gdbarch_dwarf2_reg_to_regnum (gdbarch, data[0] - DW_OP_breg0);
|
||
|
||
data = read_sleb128 (data + 1, data + size, &offset);
|
||
|
||
fprintf_filtered (stream,
|
||
_("a variable at offset %s from base reg $%s"),
|
||
plongest (offset),
|
||
gdbarch_register_name (gdbarch, regno));
|
||
}
|
||
|
||
/* The location expression for a TLS variable looks like this (on a
|
||
64-bit LE machine):
|
||
|
||
DW_AT_location : 10 byte block: 3 4 0 0 0 0 0 0 0 e0
|
||
(DW_OP_addr: 4; DW_OP_GNU_push_tls_address)
|
||
|
||
0x3 is the encoding for DW_OP_addr, which has an operand as long
|
||
as the size of an address on the target machine (here is 8
|
||
bytes). 0xe0 is the encoding for DW_OP_GNU_push_tls_address.
|
||
The operand represents the offset at which the variable is within
|
||
the thread local storage. */
|
||
|
||
else if (size > 1
|
||
&& data[size - 1] == DW_OP_GNU_push_tls_address
|
||
&& data[0] == DW_OP_addr)
|
||
{
|
||
CORE_ADDR offset = dwarf2_read_address (gdbarch,
|
||
data + 1,
|
||
data + size - 1,
|
||
addr_size);
|
||
|
||
fprintf_filtered (stream,
|
||
_("a thread-local variable at offset %s "
|
||
"in the thread-local storage for `%s'"),
|
||
paddress (gdbarch, offset), objfile->name);
|
||
|
||
data += 1 + addr_size + 1;
|
||
}
|
||
else
|
||
fprintf_filtered (stream,
|
||
_("a variable with complex or multiple locations (DWARF2)"));
|
||
|
||
return data;
|
||
}
|
||
|
||
/* Describe a single location, which may in turn consist of multiple
|
||
pieces. */
|
||
|
||
static void
|
||
locexpr_describe_location_1 (struct symbol *symbol, CORE_ADDR addr,
|
||
struct ui_file *stream, gdb_byte *data, int size,
|
||
struct objfile *objfile, unsigned int addr_size)
|
||
{
|
||
gdb_byte *end = data + size;
|
||
int piece_done = 0, first_piece = 1, bad = 0;
|
||
|
||
/* A multi-piece description consists of multiple sequences of bytes
|
||
each followed by DW_OP_piece + length of piece. */
|
||
while (data < end)
|
||
{
|
||
if (!piece_done)
|
||
{
|
||
if (first_piece)
|
||
first_piece = 0;
|
||
else
|
||
fprintf_filtered (stream, _(", and "));
|
||
|
||
data = locexpr_describe_location_piece (symbol, stream, addr, objfile,
|
||
data, size, addr_size);
|
||
piece_done = 1;
|
||
}
|
||
else if (data[0] == DW_OP_piece)
|
||
{
|
||
ULONGEST bytes;
|
||
|
||
data = read_uleb128 (data + 1, end, &bytes);
|
||
|
||
fprintf_filtered (stream, _(" [%s-byte piece]"), pulongest (bytes));
|
||
|
||
piece_done = 0;
|
||
}
|
||
else
|
||
{
|
||
bad = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (bad || data > end)
|
||
error (_("Corrupted DWARF2 expression for \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
}
|
||
|
||
/* Print a natural-language description of SYMBOL to STREAM. This
|
||
version is for a symbol with a single location. */
|
||
|
||
static void
|
||
locexpr_describe_location (struct symbol *symbol, CORE_ADDR addr,
|
||
struct ui_file *stream)
|
||
{
|
||
struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
|
||
unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
|
||
|
||
locexpr_describe_location_1 (symbol, addr, stream, dlbaton->data, dlbaton->size,
|
||
objfile, addr_size);
|
||
}
|
||
|
||
/* Describe the location of SYMBOL as an agent value in VALUE, generating
|
||
any necessary bytecode in AX. */
|
||
|
||
static void
|
||
locexpr_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
|
||
struct agent_expr *ax, struct axs_value *value)
|
||
{
|
||
struct dwarf2_locexpr_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
|
||
dwarf2_tracepoint_var_ref (symbol, gdbarch, ax, value,
|
||
dlbaton->data, dlbaton->size);
|
||
}
|
||
|
||
/* The set of location functions used with the DWARF-2 expression
|
||
evaluator. */
|
||
const struct symbol_computed_ops dwarf2_locexpr_funcs = {
|
||
locexpr_read_variable,
|
||
locexpr_read_needs_frame,
|
||
locexpr_describe_location,
|
||
locexpr_tracepoint_var_ref
|
||
};
|
||
|
||
|
||
/* Wrapper functions for location lists. These generally find
|
||
the appropriate location expression and call something above. */
|
||
|
||
/* Return the value of SYMBOL in FRAME using the DWARF-2 expression
|
||
evaluator to calculate the location. */
|
||
static struct value *
|
||
loclist_read_variable (struct symbol *symbol, struct frame_info *frame)
|
||
{
|
||
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
struct value *val;
|
||
gdb_byte *data;
|
||
size_t size;
|
||
|
||
data = find_location_expression (dlbaton, &size,
|
||
frame ? get_frame_address_in_block (frame)
|
||
: 0);
|
||
if (data == NULL)
|
||
{
|
||
val = allocate_value (SYMBOL_TYPE (symbol));
|
||
VALUE_LVAL (val) = not_lval;
|
||
set_value_optimized_out (val, 1);
|
||
}
|
||
else
|
||
val = dwarf2_evaluate_loc_desc (SYMBOL_TYPE (symbol), frame, data, size,
|
||
dlbaton->per_cu);
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Return non-zero iff we need a frame to evaluate SYMBOL. */
|
||
static int
|
||
loclist_read_needs_frame (struct symbol *symbol)
|
||
{
|
||
/* If there's a location list, then assume we need to have a frame
|
||
to choose the appropriate location expression. With tracking of
|
||
global variables this is not necessarily true, but such tracking
|
||
is disabled in GCC at the moment until we figure out how to
|
||
represent it. */
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Print a natural-language description of SYMBOL to STREAM. This
|
||
version applies when there is a list of different locations, each
|
||
with a specified address range. */
|
||
|
||
static void
|
||
loclist_describe_location (struct symbol *symbol, CORE_ADDR addr,
|
||
struct ui_file *stream)
|
||
{
|
||
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
CORE_ADDR low, high;
|
||
gdb_byte *loc_ptr, *buf_end;
|
||
int length, first = 1;
|
||
struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
|
||
struct gdbarch *gdbarch = get_objfile_arch (objfile);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
unsigned int addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
|
||
CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
|
||
/* Adjust base_address for relocatable objects. */
|
||
CORE_ADDR base_offset = ANOFFSET (objfile->section_offsets,
|
||
SECT_OFF_TEXT (objfile));
|
||
CORE_ADDR base_address = dlbaton->base_address + base_offset;
|
||
|
||
loc_ptr = dlbaton->data;
|
||
buf_end = dlbaton->data + dlbaton->size;
|
||
|
||
fprintf_filtered (stream, _("multi-location ("));
|
||
|
||
/* Iterate through locations until we run out. */
|
||
while (1)
|
||
{
|
||
if (buf_end - loc_ptr < 2 * addr_size)
|
||
error (_("Corrupted DWARF expression for symbol \"%s\"."),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
|
||
low = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
|
||
loc_ptr += addr_size;
|
||
|
||
/* A base-address-selection entry. */
|
||
if (low == base_mask)
|
||
{
|
||
base_address = dwarf2_read_address (gdbarch,
|
||
loc_ptr, buf_end, addr_size);
|
||
fprintf_filtered (stream, _("[base address %s]"),
|
||
paddress (gdbarch, base_address));
|
||
loc_ptr += addr_size;
|
||
continue;
|
||
}
|
||
|
||
high = extract_unsigned_integer (loc_ptr, addr_size, byte_order);
|
||
loc_ptr += addr_size;
|
||
|
||
/* An end-of-list entry. */
|
||
if (low == 0 && high == 0)
|
||
{
|
||
/* Indicate the end of the list, for readability. */
|
||
fprintf_filtered (stream, _(")"));
|
||
return;
|
||
}
|
||
|
||
/* Otherwise, a location expression entry. */
|
||
low += base_address;
|
||
high += base_address;
|
||
|
||
length = extract_unsigned_integer (loc_ptr, 2, byte_order);
|
||
loc_ptr += 2;
|
||
|
||
/* Separate the different locations with a semicolon. */
|
||
if (first)
|
||
first = 0;
|
||
else
|
||
fprintf_filtered (stream, _("; "));
|
||
|
||
/* (It would improve readability to print only the minimum
|
||
necessary digits of the second number of the range.) */
|
||
fprintf_filtered (stream, _("range %s-%s, "),
|
||
paddress (gdbarch, low), paddress (gdbarch, high));
|
||
|
||
/* Now describe this particular location. */
|
||
locexpr_describe_location_1 (symbol, low, stream, loc_ptr, length,
|
||
objfile, addr_size);
|
||
|
||
loc_ptr += length;
|
||
}
|
||
}
|
||
|
||
/* Describe the location of SYMBOL as an agent value in VALUE, generating
|
||
any necessary bytecode in AX. */
|
||
static void
|
||
loclist_tracepoint_var_ref (struct symbol *symbol, struct gdbarch *gdbarch,
|
||
struct agent_expr *ax, struct axs_value *value)
|
||
{
|
||
struct dwarf2_loclist_baton *dlbaton = SYMBOL_LOCATION_BATON (symbol);
|
||
gdb_byte *data;
|
||
size_t size;
|
||
|
||
data = find_location_expression (dlbaton, &size, ax->scope);
|
||
|
||
dwarf2_tracepoint_var_ref (symbol, gdbarch, ax, value, data, size);
|
||
}
|
||
|
||
/* The set of location functions used with the DWARF-2 expression
|
||
evaluator and location lists. */
|
||
const struct symbol_computed_ops dwarf2_loclist_funcs = {
|
||
loclist_read_variable,
|
||
loclist_read_needs_frame,
|
||
loclist_describe_location,
|
||
loclist_tracepoint_var_ref
|
||
};
|