1283 lines
35 KiB
C
1283 lines
35 KiB
C
/* DWARF 2 Expression Evaluator.
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Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
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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 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 "symtab.h"
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#include "gdbtypes.h"
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#include "value.h"
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#include "gdbcore.h"
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#include "dwarf2.h"
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#include "dwarf2expr.h"
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#include "gdb_assert.h"
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/* Local prototypes. */
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static void execute_stack_op (struct dwarf_expr_context *,
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const gdb_byte *, const gdb_byte *);
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/* Cookie for gdbarch data. */
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static struct gdbarch_data *dwarf_arch_cookie;
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/* This holds gdbarch-specific types used by the DWARF expression
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evaluator. See comments in execute_stack_op. */
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struct dwarf_gdbarch_types
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{
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struct type *dw_types[3];
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};
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/* Allocate and fill in dwarf_gdbarch_types for an arch. */
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static void *
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dwarf_gdbarch_types_init (struct gdbarch *gdbarch)
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{
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struct dwarf_gdbarch_types *types
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= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct dwarf_gdbarch_types);
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/* The types themselves are lazily initialized. */
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return types;
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}
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/* Return the type used for DWARF operations where the type is
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unspecified in the DWARF spec. Only certain sizes are
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supported. */
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static struct type *
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dwarf_expr_address_type (struct dwarf_expr_context *ctx)
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{
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struct dwarf_gdbarch_types *types = gdbarch_data (ctx->gdbarch,
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dwarf_arch_cookie);
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int ndx;
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if (ctx->addr_size == 2)
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ndx = 0;
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else if (ctx->addr_size == 4)
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ndx = 1;
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else if (ctx->addr_size == 8)
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ndx = 2;
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else
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error (_("Unsupported address size in DWARF expressions: %d bits"),
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8 * ctx->addr_size);
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if (types->dw_types[ndx] == NULL)
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types->dw_types[ndx]
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= arch_integer_type (ctx->gdbarch,
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8 * ctx->addr_size,
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0, "<signed DWARF address type>");
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return types->dw_types[ndx];
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}
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/* Create a new context for the expression evaluator. */
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struct dwarf_expr_context *
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new_dwarf_expr_context (void)
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{
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struct dwarf_expr_context *retval;
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retval = xcalloc (1, sizeof (struct dwarf_expr_context));
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retval->stack_len = 0;
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retval->stack_allocated = 10;
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retval->stack = xmalloc (retval->stack_allocated
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* sizeof (struct dwarf_stack_value));
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retval->num_pieces = 0;
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retval->pieces = 0;
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retval->max_recursion_depth = 0x100;
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return retval;
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}
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/* Release the memory allocated to CTX. */
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void
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free_dwarf_expr_context (struct dwarf_expr_context *ctx)
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{
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xfree (ctx->stack);
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xfree (ctx->pieces);
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xfree (ctx);
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}
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/* Helper for make_cleanup_free_dwarf_expr_context. */
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static void
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free_dwarf_expr_context_cleanup (void *arg)
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{
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free_dwarf_expr_context (arg);
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}
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/* Return a cleanup that calls free_dwarf_expr_context. */
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struct cleanup *
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make_cleanup_free_dwarf_expr_context (struct dwarf_expr_context *ctx)
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{
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return make_cleanup (free_dwarf_expr_context_cleanup, ctx);
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}
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/* Expand the memory allocated to CTX's stack to contain at least
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NEED more elements than are currently used. */
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static void
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dwarf_expr_grow_stack (struct dwarf_expr_context *ctx, size_t need)
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{
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if (ctx->stack_len + need > ctx->stack_allocated)
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{
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size_t newlen = ctx->stack_len + need + 10;
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ctx->stack = xrealloc (ctx->stack,
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newlen * sizeof (struct dwarf_stack_value));
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ctx->stack_allocated = newlen;
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}
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}
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/* Push VALUE onto CTX's stack. */
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static void
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dwarf_expr_push (struct dwarf_expr_context *ctx, struct value *value,
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int in_stack_memory)
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{
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struct dwarf_stack_value *v;
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dwarf_expr_grow_stack (ctx, 1);
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v = &ctx->stack[ctx->stack_len++];
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v->value = value;
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v->in_stack_memory = in_stack_memory;
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}
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/* Push VALUE onto CTX's stack. */
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void
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dwarf_expr_push_address (struct dwarf_expr_context *ctx, CORE_ADDR value,
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int in_stack_memory)
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{
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dwarf_expr_push (ctx,
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value_from_ulongest (dwarf_expr_address_type (ctx), value),
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in_stack_memory);
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}
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/* Pop the top item off of CTX's stack. */
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static void
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dwarf_expr_pop (struct dwarf_expr_context *ctx)
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{
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if (ctx->stack_len <= 0)
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error (_("dwarf expression stack underflow"));
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ctx->stack_len--;
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}
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/* Retrieve the N'th item on CTX's stack. */
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struct value *
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dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n)
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{
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if (ctx->stack_len <= n)
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error (_("Asked for position %d of stack, "
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"stack only has %d elements on it."),
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n, ctx->stack_len);
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return ctx->stack[ctx->stack_len - (1 + n)].value;
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}
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/* Require that TYPE be an integral type; throw an exception if not. */
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static void
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dwarf_require_integral (struct type *type)
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{
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if (TYPE_CODE (type) != TYPE_CODE_INT
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&& TYPE_CODE (type) != TYPE_CODE_CHAR
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&& TYPE_CODE (type) != TYPE_CODE_BOOL)
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error (_("integral type expected in DWARF expression"));
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}
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/* Return the unsigned form of TYPE. TYPE is necessarily an integral
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type. */
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static struct type *
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get_unsigned_type (struct gdbarch *gdbarch, struct type *type)
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{
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switch (TYPE_LENGTH (type))
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{
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case 1:
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return builtin_type (gdbarch)->builtin_uint8;
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case 2:
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return builtin_type (gdbarch)->builtin_uint16;
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case 4:
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return builtin_type (gdbarch)->builtin_uint32;
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case 8:
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return builtin_type (gdbarch)->builtin_uint64;
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default:
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error (_("no unsigned variant found for type, while evaluating "
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"DWARF expression"));
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}
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}
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/* Return the signed form of TYPE. TYPE is necessarily an integral
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type. */
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static struct type *
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get_signed_type (struct gdbarch *gdbarch, struct type *type)
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{
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switch (TYPE_LENGTH (type))
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{
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case 1:
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return builtin_type (gdbarch)->builtin_int8;
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case 2:
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return builtin_type (gdbarch)->builtin_int16;
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case 4:
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return builtin_type (gdbarch)->builtin_int32;
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case 8:
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return builtin_type (gdbarch)->builtin_int64;
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default:
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error (_("no signed variant found for type, while evaluating "
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"DWARF expression"));
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}
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}
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/* Retrieve the N'th item on CTX's stack, converted to an address. */
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CORE_ADDR
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dwarf_expr_fetch_address (struct dwarf_expr_context *ctx, int n)
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{
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struct value *result_val = dwarf_expr_fetch (ctx, n);
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enum bfd_endian byte_order = gdbarch_byte_order (ctx->gdbarch);
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ULONGEST result;
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dwarf_require_integral (value_type (result_val));
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result = extract_unsigned_integer (value_contents (result_val),
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TYPE_LENGTH (value_type (result_val)),
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byte_order);
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/* For most architectures, calling extract_unsigned_integer() alone
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is sufficient for extracting an address. However, some
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architectures (e.g. MIPS) use signed addresses and using
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extract_unsigned_integer() will not produce a correct
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result. Make sure we invoke gdbarch_integer_to_address()
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for those architectures which require it. */
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if (gdbarch_integer_to_address_p (ctx->gdbarch))
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{
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gdb_byte *buf = alloca (ctx->addr_size);
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struct type *int_type = get_unsigned_type (ctx->gdbarch,
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value_type (result_val));
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store_unsigned_integer (buf, ctx->addr_size, byte_order, result);
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return gdbarch_integer_to_address (ctx->gdbarch, int_type, buf);
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}
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return (CORE_ADDR) result;
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}
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/* Retrieve the in_stack_memory flag of the N'th item on CTX's stack. */
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int
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dwarf_expr_fetch_in_stack_memory (struct dwarf_expr_context *ctx, int n)
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{
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if (ctx->stack_len <= n)
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error (_("Asked for position %d of stack, "
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"stack only has %d elements on it."),
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n, ctx->stack_len);
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return ctx->stack[ctx->stack_len - (1 + n)].in_stack_memory;
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}
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/* Return true if the expression stack is empty. */
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static int
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dwarf_expr_stack_empty_p (struct dwarf_expr_context *ctx)
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{
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return ctx->stack_len == 0;
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}
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/* Add a new piece to CTX's piece list. */
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static void
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add_piece (struct dwarf_expr_context *ctx, ULONGEST size, ULONGEST offset)
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{
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struct dwarf_expr_piece *p;
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ctx->num_pieces++;
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ctx->pieces = xrealloc (ctx->pieces,
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(ctx->num_pieces
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* sizeof (struct dwarf_expr_piece)));
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p = &ctx->pieces[ctx->num_pieces - 1];
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p->location = ctx->location;
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p->size = size;
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p->offset = offset;
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if (p->location == DWARF_VALUE_LITERAL)
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{
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p->v.literal.data = ctx->data;
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p->v.literal.length = ctx->len;
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}
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else if (dwarf_expr_stack_empty_p (ctx))
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{
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p->location = DWARF_VALUE_OPTIMIZED_OUT;
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/* Also reset the context's location, for our callers. This is
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a somewhat strange approach, but this lets us avoid setting
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the location to DWARF_VALUE_MEMORY in all the individual
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cases in the evaluator. */
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ctx->location = DWARF_VALUE_OPTIMIZED_OUT;
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}
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else if (p->location == DWARF_VALUE_MEMORY)
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{
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p->v.mem.addr = dwarf_expr_fetch_address (ctx, 0);
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p->v.mem.in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
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}
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else if (p->location == DWARF_VALUE_IMPLICIT_POINTER)
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{
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p->v.ptr.die = ctx->len;
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p->v.ptr.offset = value_as_long (dwarf_expr_fetch (ctx, 0));
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}
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else if (p->location == DWARF_VALUE_REGISTER)
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p->v.regno = value_as_long (dwarf_expr_fetch (ctx, 0));
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else
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{
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p->v.value = dwarf_expr_fetch (ctx, 0);
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}
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}
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/* Evaluate the expression at ADDR (LEN bytes long) using the context
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CTX. */
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void
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dwarf_expr_eval (struct dwarf_expr_context *ctx, const gdb_byte *addr,
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size_t len)
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{
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int old_recursion_depth = ctx->recursion_depth;
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execute_stack_op (ctx, addr, addr + len);
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/* CTX RECURSION_DEPTH becomes invalid if an exception was thrown here. */
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gdb_assert (ctx->recursion_depth == old_recursion_depth);
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}
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/* Decode the unsigned LEB128 constant at BUF into the variable pointed to
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by R, and return the new value of BUF. Verify that it doesn't extend
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past BUF_END. */
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const gdb_byte *
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read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, ULONGEST * r)
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{
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unsigned shift = 0;
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ULONGEST result = 0;
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gdb_byte byte;
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while (1)
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{
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if (buf >= buf_end)
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error (_("read_uleb128: Corrupted DWARF expression."));
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byte = *buf++;
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result |= ((ULONGEST) (byte & 0x7f)) << shift;
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if ((byte & 0x80) == 0)
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break;
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shift += 7;
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}
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*r = result;
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return buf;
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}
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|
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/* Decode the signed LEB128 constant at BUF into the variable pointed to
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by R, and return the new value of BUF. Verify that it doesn't extend
|
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past BUF_END. */
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const gdb_byte *
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read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, LONGEST * r)
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{
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||
unsigned shift = 0;
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||
LONGEST result = 0;
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gdb_byte byte;
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|
||
while (1)
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{
|
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if (buf >= buf_end)
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error (_("read_sleb128: Corrupted DWARF expression."));
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|
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byte = *buf++;
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result |= ((ULONGEST) (byte & 0x7f)) << shift;
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shift += 7;
|
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if ((byte & 0x80) == 0)
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break;
|
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}
|
||
if (shift < (sizeof (*r) * 8) && (byte & 0x40) != 0)
|
||
result |= -(1 << shift);
|
||
|
||
*r = result;
|
||
return buf;
|
||
}
|
||
|
||
|
||
/* Check that the current operator is either at the end of an
|
||
expression, or that it is followed by a composition operator. */
|
||
|
||
void
|
||
dwarf_expr_require_composition (const gdb_byte *op_ptr, const gdb_byte *op_end,
|
||
const char *op_name)
|
||
{
|
||
/* It seems like DW_OP_GNU_uninit should be handled here. However,
|
||
it doesn't seem to make sense for DW_OP_*_value, and it was not
|
||
checked at the other place that this function is called. */
|
||
if (op_ptr != op_end && *op_ptr != DW_OP_piece && *op_ptr != DW_OP_bit_piece)
|
||
error (_("DWARF-2 expression error: `%s' operations must be "
|
||
"used either alone or in conjunction with DW_OP_piece "
|
||
"or DW_OP_bit_piece."),
|
||
op_name);
|
||
}
|
||
|
||
/* Return true iff the types T1 and T2 are "the same". This only does
|
||
checks that might reasonably be needed to compare DWARF base
|
||
types. */
|
||
|
||
static int
|
||
base_types_equal_p (struct type *t1, struct type *t2)
|
||
{
|
||
if (TYPE_CODE (t1) != TYPE_CODE (t2))
|
||
return 0;
|
||
if (TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2))
|
||
return 0;
|
||
return TYPE_LENGTH (t1) == TYPE_LENGTH (t2);
|
||
}
|
||
|
||
/* A convenience function to call get_base_type on CTX and return the
|
||
result. DIE is the DIE whose type we need. SIZE is non-zero if
|
||
this function should verify that the resulting type has the correct
|
||
size. */
|
||
|
||
static struct type *
|
||
dwarf_get_base_type (struct dwarf_expr_context *ctx, ULONGEST die, int size)
|
||
{
|
||
struct type *result;
|
||
|
||
if (ctx->get_base_type)
|
||
{
|
||
result = ctx->get_base_type (ctx, die);
|
||
if (result == NULL)
|
||
error (_("Could not find type for DW_OP_GNU_const_type"));
|
||
if (size != 0 && TYPE_LENGTH (result) != size)
|
||
error (_("DW_OP_GNU_const_type has different sizes for type and data"));
|
||
}
|
||
else
|
||
/* Anything will do. */
|
||
result = builtin_type (ctx->gdbarch)->builtin_int;
|
||
|
||
return result;
|
||
}
|
||
|
||
/* The engine for the expression evaluator. Using the context in CTX,
|
||
evaluate the expression between OP_PTR and OP_END. */
|
||
|
||
static void
|
||
execute_stack_op (struct dwarf_expr_context *ctx,
|
||
const gdb_byte *op_ptr, const gdb_byte *op_end)
|
||
{
|
||
enum bfd_endian byte_order = gdbarch_byte_order (ctx->gdbarch);
|
||
/* Old-style "untyped" DWARF values need special treatment in a
|
||
couple of places, specifically DW_OP_mod and DW_OP_shr. We need
|
||
a special type for these values so we can distinguish them from
|
||
values that have an explicit type, because explicitly-typed
|
||
values do not need special treatment. This special type must be
|
||
different (in the `==' sense) from any base type coming from the
|
||
CU. */
|
||
struct type *address_type = dwarf_expr_address_type (ctx);
|
||
|
||
ctx->location = DWARF_VALUE_MEMORY;
|
||
ctx->initialized = 1; /* Default is initialized. */
|
||
|
||
if (ctx->recursion_depth > ctx->max_recursion_depth)
|
||
error (_("DWARF-2 expression error: Loop detected (%d)."),
|
||
ctx->recursion_depth);
|
||
ctx->recursion_depth++;
|
||
|
||
while (op_ptr < op_end)
|
||
{
|
||
enum dwarf_location_atom op = *op_ptr++;
|
||
ULONGEST result;
|
||
/* Assume the value is not in stack memory.
|
||
Code that knows otherwise sets this to 1.
|
||
Some arithmetic on stack addresses can probably be assumed to still
|
||
be a stack address, but we skip this complication for now.
|
||
This is just an optimization, so it's always ok to punt
|
||
and leave this as 0. */
|
||
int in_stack_memory = 0;
|
||
ULONGEST uoffset, reg;
|
||
LONGEST offset;
|
||
struct value *result_val = NULL;
|
||
|
||
switch (op)
|
||
{
|
||
case DW_OP_lit0:
|
||
case DW_OP_lit1:
|
||
case DW_OP_lit2:
|
||
case DW_OP_lit3:
|
||
case DW_OP_lit4:
|
||
case DW_OP_lit5:
|
||
case DW_OP_lit6:
|
||
case DW_OP_lit7:
|
||
case DW_OP_lit8:
|
||
case DW_OP_lit9:
|
||
case DW_OP_lit10:
|
||
case DW_OP_lit11:
|
||
case DW_OP_lit12:
|
||
case DW_OP_lit13:
|
||
case DW_OP_lit14:
|
||
case DW_OP_lit15:
|
||
case DW_OP_lit16:
|
||
case DW_OP_lit17:
|
||
case DW_OP_lit18:
|
||
case DW_OP_lit19:
|
||
case DW_OP_lit20:
|
||
case DW_OP_lit21:
|
||
case DW_OP_lit22:
|
||
case DW_OP_lit23:
|
||
case DW_OP_lit24:
|
||
case DW_OP_lit25:
|
||
case DW_OP_lit26:
|
||
case DW_OP_lit27:
|
||
case DW_OP_lit28:
|
||
case DW_OP_lit29:
|
||
case DW_OP_lit30:
|
||
case DW_OP_lit31:
|
||
result = op - DW_OP_lit0;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
|
||
case DW_OP_addr:
|
||
result = extract_unsigned_integer (op_ptr,
|
||
ctx->addr_size, byte_order);
|
||
op_ptr += ctx->addr_size;
|
||
/* Some versions of GCC emit DW_OP_addr before
|
||
DW_OP_GNU_push_tls_address. In this case the value is an
|
||
index, not an address. We don't support things like
|
||
branching between the address and the TLS op. */
|
||
if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address)
|
||
result += ctx->offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
|
||
case DW_OP_const1u:
|
||
result = extract_unsigned_integer (op_ptr, 1, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 1;
|
||
break;
|
||
case DW_OP_const1s:
|
||
result = extract_signed_integer (op_ptr, 1, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 1;
|
||
break;
|
||
case DW_OP_const2u:
|
||
result = extract_unsigned_integer (op_ptr, 2, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 2;
|
||
break;
|
||
case DW_OP_const2s:
|
||
result = extract_signed_integer (op_ptr, 2, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 2;
|
||
break;
|
||
case DW_OP_const4u:
|
||
result = extract_unsigned_integer (op_ptr, 4, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 4;
|
||
break;
|
||
case DW_OP_const4s:
|
||
result = extract_signed_integer (op_ptr, 4, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 4;
|
||
break;
|
||
case DW_OP_const8u:
|
||
result = extract_unsigned_integer (op_ptr, 8, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 8;
|
||
break;
|
||
case DW_OP_const8s:
|
||
result = extract_signed_integer (op_ptr, 8, byte_order);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
op_ptr += 8;
|
||
break;
|
||
case DW_OP_constu:
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &uoffset);
|
||
result = uoffset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_consts:
|
||
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
|
||
result = offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
|
||
/* The DW_OP_reg operations are required to occur alone in
|
||
location expressions. */
|
||
case DW_OP_reg0:
|
||
case DW_OP_reg1:
|
||
case DW_OP_reg2:
|
||
case DW_OP_reg3:
|
||
case DW_OP_reg4:
|
||
case DW_OP_reg5:
|
||
case DW_OP_reg6:
|
||
case DW_OP_reg7:
|
||
case DW_OP_reg8:
|
||
case DW_OP_reg9:
|
||
case DW_OP_reg10:
|
||
case DW_OP_reg11:
|
||
case DW_OP_reg12:
|
||
case DW_OP_reg13:
|
||
case DW_OP_reg14:
|
||
case DW_OP_reg15:
|
||
case DW_OP_reg16:
|
||
case DW_OP_reg17:
|
||
case DW_OP_reg18:
|
||
case DW_OP_reg19:
|
||
case DW_OP_reg20:
|
||
case DW_OP_reg21:
|
||
case DW_OP_reg22:
|
||
case DW_OP_reg23:
|
||
case DW_OP_reg24:
|
||
case DW_OP_reg25:
|
||
case DW_OP_reg26:
|
||
case DW_OP_reg27:
|
||
case DW_OP_reg28:
|
||
case DW_OP_reg29:
|
||
case DW_OP_reg30:
|
||
case DW_OP_reg31:
|
||
if (op_ptr != op_end
|
||
&& *op_ptr != DW_OP_piece
|
||
&& *op_ptr != DW_OP_bit_piece
|
||
&& *op_ptr != DW_OP_GNU_uninit)
|
||
error (_("DWARF-2 expression error: DW_OP_reg operations must be "
|
||
"used either alone or in conjunction with DW_OP_piece "
|
||
"or DW_OP_bit_piece."));
|
||
|
||
result = op - DW_OP_reg0;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
ctx->location = DWARF_VALUE_REGISTER;
|
||
break;
|
||
|
||
case DW_OP_regx:
|
||
op_ptr = read_uleb128 (op_ptr, op_end, ®);
|
||
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_regx");
|
||
|
||
result = reg;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
ctx->location = DWARF_VALUE_REGISTER;
|
||
break;
|
||
|
||
case DW_OP_implicit_value:
|
||
{
|
||
ULONGEST len;
|
||
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &len);
|
||
if (op_ptr + len > op_end)
|
||
error (_("DW_OP_implicit_value: too few bytes available."));
|
||
ctx->len = len;
|
||
ctx->data = op_ptr;
|
||
ctx->location = DWARF_VALUE_LITERAL;
|
||
op_ptr += len;
|
||
dwarf_expr_require_composition (op_ptr, op_end,
|
||
"DW_OP_implicit_value");
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_stack_value:
|
||
ctx->location = DWARF_VALUE_STACK;
|
||
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value");
|
||
goto no_push;
|
||
|
||
case DW_OP_GNU_implicit_pointer:
|
||
{
|
||
ULONGEST die;
|
||
LONGEST len;
|
||
|
||
/* The referred-to DIE. */
|
||
ctx->len = extract_unsigned_integer (op_ptr, ctx->addr_size,
|
||
byte_order);
|
||
op_ptr += ctx->addr_size;
|
||
|
||
/* The byte offset into the data. */
|
||
op_ptr = read_sleb128 (op_ptr, op_end, &len);
|
||
result = (ULONGEST) len;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
|
||
ctx->location = DWARF_VALUE_IMPLICIT_POINTER;
|
||
dwarf_expr_require_composition (op_ptr, op_end,
|
||
"DW_OP_GNU_implicit_pointer");
|
||
}
|
||
break;
|
||
|
||
case DW_OP_breg0:
|
||
case DW_OP_breg1:
|
||
case DW_OP_breg2:
|
||
case DW_OP_breg3:
|
||
case DW_OP_breg4:
|
||
case DW_OP_breg5:
|
||
case DW_OP_breg6:
|
||
case DW_OP_breg7:
|
||
case DW_OP_breg8:
|
||
case DW_OP_breg9:
|
||
case DW_OP_breg10:
|
||
case DW_OP_breg11:
|
||
case DW_OP_breg12:
|
||
case DW_OP_breg13:
|
||
case DW_OP_breg14:
|
||
case DW_OP_breg15:
|
||
case DW_OP_breg16:
|
||
case DW_OP_breg17:
|
||
case DW_OP_breg18:
|
||
case DW_OP_breg19:
|
||
case DW_OP_breg20:
|
||
case DW_OP_breg21:
|
||
case DW_OP_breg22:
|
||
case DW_OP_breg23:
|
||
case DW_OP_breg24:
|
||
case DW_OP_breg25:
|
||
case DW_OP_breg26:
|
||
case DW_OP_breg27:
|
||
case DW_OP_breg28:
|
||
case DW_OP_breg29:
|
||
case DW_OP_breg30:
|
||
case DW_OP_breg31:
|
||
{
|
||
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
|
||
result = (ctx->read_reg) (ctx->baton, op - DW_OP_breg0);
|
||
result += offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
}
|
||
break;
|
||
case DW_OP_bregx:
|
||
{
|
||
op_ptr = read_uleb128 (op_ptr, op_end, ®);
|
||
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
|
||
result = (ctx->read_reg) (ctx->baton, reg);
|
||
result += offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
}
|
||
break;
|
||
case DW_OP_fbreg:
|
||
{
|
||
const gdb_byte *datastart;
|
||
size_t datalen;
|
||
unsigned int before_stack_len;
|
||
|
||
op_ptr = read_sleb128 (op_ptr, op_end, &offset);
|
||
/* Rather than create a whole new context, we simply
|
||
record the stack length before execution, then reset it
|
||
afterwards, effectively erasing whatever the recursive
|
||
call put there. */
|
||
before_stack_len = ctx->stack_len;
|
||
/* FIXME: cagney/2003-03-26: This code should be using
|
||
get_frame_base_address(), and then implement a dwarf2
|
||
specific this_base method. */
|
||
(ctx->get_frame_base) (ctx->baton, &datastart, &datalen);
|
||
dwarf_expr_eval (ctx, datastart, datalen);
|
||
if (ctx->location == DWARF_VALUE_MEMORY)
|
||
result = dwarf_expr_fetch_address (ctx, 0);
|
||
else if (ctx->location == DWARF_VALUE_REGISTER)
|
||
result
|
||
= (ctx->read_reg) (ctx->baton,
|
||
value_as_long (dwarf_expr_fetch (ctx, 0)));
|
||
else
|
||
error (_("Not implemented: computing frame "
|
||
"base using explicit value operator"));
|
||
result = result + offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
in_stack_memory = 1;
|
||
ctx->stack_len = before_stack_len;
|
||
ctx->location = DWARF_VALUE_MEMORY;
|
||
}
|
||
break;
|
||
|
||
case DW_OP_dup:
|
||
result_val = dwarf_expr_fetch (ctx, 0);
|
||
in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 0);
|
||
break;
|
||
|
||
case DW_OP_drop:
|
||
dwarf_expr_pop (ctx);
|
||
goto no_push;
|
||
|
||
case DW_OP_pick:
|
||
offset = *op_ptr++;
|
||
result_val = dwarf_expr_fetch (ctx, offset);
|
||
in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, offset);
|
||
break;
|
||
|
||
case DW_OP_swap:
|
||
{
|
||
struct dwarf_stack_value t1, t2;
|
||
|
||
if (ctx->stack_len < 2)
|
||
error (_("Not enough elements for "
|
||
"DW_OP_swap. Need 2, have %d."),
|
||
ctx->stack_len);
|
||
t1 = ctx->stack[ctx->stack_len - 1];
|
||
t2 = ctx->stack[ctx->stack_len - 2];
|
||
ctx->stack[ctx->stack_len - 1] = t2;
|
||
ctx->stack[ctx->stack_len - 2] = t1;
|
||
goto no_push;
|
||
}
|
||
|
||
case DW_OP_over:
|
||
result_val = dwarf_expr_fetch (ctx, 1);
|
||
in_stack_memory = dwarf_expr_fetch_in_stack_memory (ctx, 1);
|
||
break;
|
||
|
||
case DW_OP_rot:
|
||
{
|
||
struct dwarf_stack_value t1, t2, t3;
|
||
|
||
if (ctx->stack_len < 3)
|
||
error (_("Not enough elements for "
|
||
"DW_OP_rot. Need 3, have %d."),
|
||
ctx->stack_len);
|
||
t1 = ctx->stack[ctx->stack_len - 1];
|
||
t2 = ctx->stack[ctx->stack_len - 2];
|
||
t3 = ctx->stack[ctx->stack_len - 3];
|
||
ctx->stack[ctx->stack_len - 1] = t2;
|
||
ctx->stack[ctx->stack_len - 2] = t3;
|
||
ctx->stack[ctx->stack_len - 3] = t1;
|
||
goto no_push;
|
||
}
|
||
|
||
case DW_OP_deref:
|
||
case DW_OP_deref_size:
|
||
case DW_OP_GNU_deref_type:
|
||
{
|
||
int addr_size = (op == DW_OP_deref ? ctx->addr_size : *op_ptr++);
|
||
gdb_byte *buf = alloca (addr_size);
|
||
CORE_ADDR addr = dwarf_expr_fetch_address (ctx, 0);
|
||
struct type *type;
|
||
|
||
dwarf_expr_pop (ctx);
|
||
|
||
if (op == DW_OP_GNU_deref_type)
|
||
{
|
||
ULONGEST type_die;
|
||
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
|
||
type = dwarf_get_base_type (ctx, type_die, 0);
|
||
}
|
||
else
|
||
type = address_type;
|
||
|
||
(ctx->read_mem) (ctx->baton, buf, addr, addr_size);
|
||
|
||
/* If the size of the object read from memory is different
|
||
from the type length, we need to zero-extend it. */
|
||
if (TYPE_LENGTH (type) != addr_size)
|
||
{
|
||
ULONGEST result =
|
||
extract_unsigned_integer (buf, addr_size, byte_order);
|
||
|
||
buf = alloca (TYPE_LENGTH (type));
|
||
store_unsigned_integer (buf, TYPE_LENGTH (type),
|
||
byte_order, result);
|
||
}
|
||
|
||
result_val = value_from_contents_and_address (type, buf, addr);
|
||
break;
|
||
}
|
||
|
||
case DW_OP_abs:
|
||
case DW_OP_neg:
|
||
case DW_OP_not:
|
||
case DW_OP_plus_uconst:
|
||
{
|
||
/* Unary operations. */
|
||
result_val = dwarf_expr_fetch (ctx, 0);
|
||
dwarf_expr_pop (ctx);
|
||
|
||
switch (op)
|
||
{
|
||
case DW_OP_abs:
|
||
if (value_less (result_val,
|
||
value_zero (value_type (result_val), not_lval)))
|
||
result_val = value_neg (result_val);
|
||
break;
|
||
case DW_OP_neg:
|
||
result_val = value_neg (result_val);
|
||
break;
|
||
case DW_OP_not:
|
||
dwarf_require_integral (value_type (result_val));
|
||
result_val = value_complement (result_val);
|
||
break;
|
||
case DW_OP_plus_uconst:
|
||
dwarf_require_integral (value_type (result_val));
|
||
result = value_as_long (result_val);
|
||
op_ptr = read_uleb128 (op_ptr, op_end, ®);
|
||
result += reg;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DW_OP_and:
|
||
case DW_OP_div:
|
||
case DW_OP_minus:
|
||
case DW_OP_mod:
|
||
case DW_OP_mul:
|
||
case DW_OP_or:
|
||
case DW_OP_plus:
|
||
case DW_OP_shl:
|
||
case DW_OP_shr:
|
||
case DW_OP_shra:
|
||
case DW_OP_xor:
|
||
case DW_OP_le:
|
||
case DW_OP_ge:
|
||
case DW_OP_eq:
|
||
case DW_OP_lt:
|
||
case DW_OP_gt:
|
||
case DW_OP_ne:
|
||
{
|
||
/* Binary operations. */
|
||
struct value *first, *second;
|
||
|
||
second = dwarf_expr_fetch (ctx, 0);
|
||
dwarf_expr_pop (ctx);
|
||
|
||
first = dwarf_expr_fetch (ctx, 0);
|
||
dwarf_expr_pop (ctx);
|
||
|
||
if (! base_types_equal_p (value_type (first), value_type (second)))
|
||
error (_("Incompatible types on DWARF stack"));
|
||
|
||
switch (op)
|
||
{
|
||
case DW_OP_and:
|
||
dwarf_require_integral (value_type (first));
|
||
dwarf_require_integral (value_type (second));
|
||
result_val = value_binop (first, second, BINOP_BITWISE_AND);
|
||
break;
|
||
case DW_OP_div:
|
||
result_val = value_binop (first, second, BINOP_DIV);
|
||
break;
|
||
case DW_OP_minus:
|
||
result_val = value_binop (first, second, BINOP_SUB);
|
||
break;
|
||
case DW_OP_mod:
|
||
{
|
||
int cast_back = 0;
|
||
struct type *orig_type = value_type (first);
|
||
|
||
/* We have to special-case "old-style" untyped values
|
||
-- these must have mod computed using unsigned
|
||
math. */
|
||
if (orig_type == address_type)
|
||
{
|
||
struct type *utype
|
||
= get_unsigned_type (ctx->gdbarch, orig_type);
|
||
|
||
cast_back = 1;
|
||
first = value_cast (utype, first);
|
||
second = value_cast (utype, second);
|
||
}
|
||
/* Note that value_binop doesn't handle float or
|
||
decimal float here. This seems unimportant. */
|
||
result_val = value_binop (first, second, BINOP_MOD);
|
||
if (cast_back)
|
||
result_val = value_cast (orig_type, result_val);
|
||
}
|
||
break;
|
||
case DW_OP_mul:
|
||
result_val = value_binop (first, second, BINOP_MUL);
|
||
break;
|
||
case DW_OP_or:
|
||
dwarf_require_integral (value_type (first));
|
||
dwarf_require_integral (value_type (second));
|
||
result_val = value_binop (first, second, BINOP_BITWISE_IOR);
|
||
break;
|
||
case DW_OP_plus:
|
||
result_val = value_binop (first, second, BINOP_ADD);
|
||
break;
|
||
case DW_OP_shl:
|
||
dwarf_require_integral (value_type (first));
|
||
dwarf_require_integral (value_type (second));
|
||
result_val = value_binop (first, second, BINOP_LSH);
|
||
break;
|
||
case DW_OP_shr:
|
||
dwarf_require_integral (value_type (first));
|
||
dwarf_require_integral (value_type (second));
|
||
if (!TYPE_UNSIGNED (value_type (first)))
|
||
{
|
||
struct type *utype
|
||
= get_unsigned_type (ctx->gdbarch, value_type (first));
|
||
|
||
first = value_cast (utype, first);
|
||
}
|
||
|
||
result_val = value_binop (first, second, BINOP_RSH);
|
||
/* Make sure we wind up with the same type we started
|
||
with. */
|
||
if (value_type (result_val) != value_type (second))
|
||
result_val = value_cast (value_type (second), result_val);
|
||
break;
|
||
case DW_OP_shra:
|
||
dwarf_require_integral (value_type (first));
|
||
dwarf_require_integral (value_type (second));
|
||
if (TYPE_UNSIGNED (value_type (first)))
|
||
{
|
||
struct type *stype
|
||
= get_signed_type (ctx->gdbarch, value_type (first));
|
||
|
||
first = value_cast (stype, first);
|
||
}
|
||
|
||
result_val = value_binop (first, second, BINOP_RSH);
|
||
/* Make sure we wind up with the same type we started
|
||
with. */
|
||
if (value_type (result_val) != value_type (second))
|
||
result_val = value_cast (value_type (second), result_val);
|
||
break;
|
||
case DW_OP_xor:
|
||
dwarf_require_integral (value_type (first));
|
||
dwarf_require_integral (value_type (second));
|
||
result_val = value_binop (first, second, BINOP_BITWISE_XOR);
|
||
break;
|
||
case DW_OP_le:
|
||
/* A <= B is !(B < A). */
|
||
result = ! value_less (second, first);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_ge:
|
||
/* A >= B is !(A < B). */
|
||
result = ! value_less (first, second);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_eq:
|
||
result = value_equal (first, second);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_lt:
|
||
result = value_less (first, second);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_gt:
|
||
/* A > B is B < A. */
|
||
result = value_less (second, first);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_ne:
|
||
result = ! value_equal (first, second);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
_("Can't be reached."));
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DW_OP_call_frame_cfa:
|
||
result = (ctx->get_frame_cfa) (ctx->baton);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
in_stack_memory = 1;
|
||
break;
|
||
|
||
case DW_OP_GNU_push_tls_address:
|
||
/* Variable is at a constant offset in the thread-local
|
||
storage block into the objfile for the current thread and
|
||
the dynamic linker module containing this expression. Here
|
||
we return returns the offset from that base. The top of the
|
||
stack has the offset from the beginning of the thread
|
||
control block at which the variable is located. Nothing
|
||
should follow this operator, so the top of stack would be
|
||
returned. */
|
||
result = value_as_long (dwarf_expr_fetch (ctx, 0));
|
||
dwarf_expr_pop (ctx);
|
||
result = (ctx->get_tls_address) (ctx->baton, result);
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
|
||
case DW_OP_skip:
|
||
offset = extract_signed_integer (op_ptr, 2, byte_order);
|
||
op_ptr += 2;
|
||
op_ptr += offset;
|
||
goto no_push;
|
||
|
||
case DW_OP_bra:
|
||
{
|
||
struct value *val;
|
||
|
||
offset = extract_signed_integer (op_ptr, 2, byte_order);
|
||
op_ptr += 2;
|
||
val = dwarf_expr_fetch (ctx, 0);
|
||
dwarf_require_integral (value_type (val));
|
||
if (value_as_long (val) != 0)
|
||
op_ptr += offset;
|
||
dwarf_expr_pop (ctx);
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_nop:
|
||
goto no_push;
|
||
|
||
case DW_OP_piece:
|
||
{
|
||
ULONGEST size;
|
||
|
||
/* Record the piece. */
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &size);
|
||
add_piece (ctx, 8 * size, 0);
|
||
|
||
/* Pop off the address/regnum, and reset the location
|
||
type. */
|
||
if (ctx->location != DWARF_VALUE_LITERAL
|
||
&& ctx->location != DWARF_VALUE_OPTIMIZED_OUT)
|
||
dwarf_expr_pop (ctx);
|
||
ctx->location = DWARF_VALUE_MEMORY;
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_bit_piece:
|
||
{
|
||
ULONGEST size, offset;
|
||
|
||
/* Record the piece. */
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &size);
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &offset);
|
||
add_piece (ctx, size, offset);
|
||
|
||
/* Pop off the address/regnum, and reset the location
|
||
type. */
|
||
if (ctx->location != DWARF_VALUE_LITERAL
|
||
&& ctx->location != DWARF_VALUE_OPTIMIZED_OUT)
|
||
dwarf_expr_pop (ctx);
|
||
ctx->location = DWARF_VALUE_MEMORY;
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_GNU_uninit:
|
||
if (op_ptr != op_end)
|
||
error (_("DWARF-2 expression error: DW_OP_GNU_uninit must always "
|
||
"be the very last op."));
|
||
|
||
ctx->initialized = 0;
|
||
goto no_push;
|
||
|
||
case DW_OP_call2:
|
||
result = extract_unsigned_integer (op_ptr, 2, byte_order);
|
||
op_ptr += 2;
|
||
ctx->dwarf_call (ctx, result);
|
||
goto no_push;
|
||
|
||
case DW_OP_call4:
|
||
result = extract_unsigned_integer (op_ptr, 4, byte_order);
|
||
op_ptr += 4;
|
||
ctx->dwarf_call (ctx, result);
|
||
goto no_push;
|
||
|
||
case DW_OP_GNU_entry_value:
|
||
/* This operation is not yet supported by GDB. */
|
||
ctx->location = DWARF_VALUE_OPTIMIZED_OUT;
|
||
ctx->stack_len = 0;
|
||
ctx->num_pieces = 0;
|
||
goto abort_expression;
|
||
|
||
case DW_OP_GNU_const_type:
|
||
{
|
||
ULONGEST type_die;
|
||
int n;
|
||
const gdb_byte *data;
|
||
struct type *type;
|
||
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
|
||
n = *op_ptr++;
|
||
data = op_ptr;
|
||
op_ptr += n;
|
||
|
||
type = dwarf_get_base_type (ctx, type_die, n);
|
||
result_val = value_from_contents (type, data);
|
||
}
|
||
break;
|
||
|
||
case DW_OP_GNU_regval_type:
|
||
{
|
||
ULONGEST type_die;
|
||
struct type *type;
|
||
|
||
op_ptr = read_uleb128 (op_ptr, op_end, ®);
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
|
||
|
||
type = dwarf_get_base_type (ctx, type_die, 0);
|
||
result = (ctx->read_reg) (ctx->baton, reg);
|
||
result_val = value_from_ulongest (type, result);
|
||
}
|
||
break;
|
||
|
||
case DW_OP_GNU_convert:
|
||
case DW_OP_GNU_reinterpret:
|
||
{
|
||
ULONGEST type_die;
|
||
struct type *type;
|
||
|
||
op_ptr = read_uleb128 (op_ptr, op_end, &type_die);
|
||
|
||
if (type_die == 0)
|
||
type = address_type;
|
||
else
|
||
type = dwarf_get_base_type (ctx, type_die, 0);
|
||
|
||
result_val = dwarf_expr_fetch (ctx, 0);
|
||
dwarf_expr_pop (ctx);
|
||
|
||
if (op == DW_OP_GNU_convert)
|
||
result_val = value_cast (type, result_val);
|
||
else if (type == value_type (result_val))
|
||
{
|
||
/* Nothing. */
|
||
}
|
||
else if (TYPE_LENGTH (type)
|
||
!= TYPE_LENGTH (value_type (result_val)))
|
||
error (_("DW_OP_GNU_reinterpret has wrong size"));
|
||
else
|
||
result_val
|
||
= value_from_contents (type,
|
||
value_contents_all (result_val));
|
||
}
|
||
break;
|
||
|
||
default:
|
||
error (_("Unhandled dwarf expression opcode 0x%x"), op);
|
||
}
|
||
|
||
/* Most things push a result value. */
|
||
gdb_assert (result_val != NULL);
|
||
dwarf_expr_push (ctx, result_val, in_stack_memory);
|
||
no_push:
|
||
;
|
||
}
|
||
|
||
/* To simplify our main caller, if the result is an implicit
|
||
pointer, then make a pieced value. This is ok because we can't
|
||
have implicit pointers in contexts where pieces are invalid. */
|
||
if (ctx->location == DWARF_VALUE_IMPLICIT_POINTER)
|
||
add_piece (ctx, 8 * ctx->addr_size, 0);
|
||
|
||
abort_expression:
|
||
ctx->recursion_depth--;
|
||
gdb_assert (ctx->recursion_depth >= 0);
|
||
}
|
||
|
||
void
|
||
_initialize_dwarf2expr (void)
|
||
{
|
||
dwarf_arch_cookie
|
||
= gdbarch_data_register_post_init (dwarf_gdbarch_types_init);
|
||
}
|