1415 lines
38 KiB
C
1415 lines
38 KiB
C
/* DWARF 2 Expression Evaluator.
|
||
|
||
Copyright (C) 2001-2018 Free Software Foundation, Inc.
|
||
|
||
Contributed by Daniel Berlin (dan@dberlin.org)
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "value.h"
|
||
#include "gdbcore.h"
|
||
#include "dwarf2.h"
|
||
#include "dwarf2expr.h"
|
||
#include "dwarf2loc.h"
|
||
#include "common/underlying.h"
|
||
|
||
/* Cookie for gdbarch data. */
|
||
|
||
static struct gdbarch_data *dwarf_arch_cookie;
|
||
|
||
/* This holds gdbarch-specific types used by the DWARF expression
|
||
evaluator. See comments in execute_stack_op. */
|
||
|
||
struct dwarf_gdbarch_types
|
||
{
|
||
struct type *dw_types[3];
|
||
};
|
||
|
||
/* Allocate and fill in dwarf_gdbarch_types for an arch. */
|
||
|
||
static void *
|
||
dwarf_gdbarch_types_init (struct gdbarch *gdbarch)
|
||
{
|
||
struct dwarf_gdbarch_types *types
|
||
= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct dwarf_gdbarch_types);
|
||
|
||
/* The types themselves are lazily initialized. */
|
||
|
||
return types;
|
||
}
|
||
|
||
/* Return the type used for DWARF operations where the type is
|
||
unspecified in the DWARF spec. Only certain sizes are
|
||
supported. */
|
||
|
||
struct type *
|
||
dwarf_expr_context::address_type () const
|
||
{
|
||
struct dwarf_gdbarch_types *types
|
||
= (struct dwarf_gdbarch_types *) gdbarch_data (this->gdbarch,
|
||
dwarf_arch_cookie);
|
||
int ndx;
|
||
|
||
if (this->addr_size == 2)
|
||
ndx = 0;
|
||
else if (this->addr_size == 4)
|
||
ndx = 1;
|
||
else if (this->addr_size == 8)
|
||
ndx = 2;
|
||
else
|
||
error (_("Unsupported address size in DWARF expressions: %d bits"),
|
||
8 * this->addr_size);
|
||
|
||
if (types->dw_types[ndx] == NULL)
|
||
types->dw_types[ndx]
|
||
= arch_integer_type (this->gdbarch,
|
||
8 * this->addr_size,
|
||
0, "<signed DWARF address type>");
|
||
|
||
return types->dw_types[ndx];
|
||
}
|
||
|
||
/* Create a new context for the expression evaluator. */
|
||
|
||
dwarf_expr_context::dwarf_expr_context ()
|
||
: gdbarch (NULL),
|
||
addr_size (0),
|
||
ref_addr_size (0),
|
||
offset (0),
|
||
recursion_depth (0),
|
||
max_recursion_depth (0x100),
|
||
location (DWARF_VALUE_MEMORY),
|
||
len (0),
|
||
data (NULL),
|
||
initialized (0)
|
||
{
|
||
}
|
||
|
||
/* Push VALUE onto the stack. */
|
||
|
||
void
|
||
dwarf_expr_context::push (struct value *value, bool in_stack_memory)
|
||
{
|
||
stack.emplace_back (value, in_stack_memory);
|
||
}
|
||
|
||
/* Push VALUE onto the stack. */
|
||
|
||
void
|
||
dwarf_expr_context::push_address (CORE_ADDR value, bool in_stack_memory)
|
||
{
|
||
push (value_from_ulongest (address_type (), value), in_stack_memory);
|
||
}
|
||
|
||
/* Pop the top item off of the stack. */
|
||
|
||
void
|
||
dwarf_expr_context::pop ()
|
||
{
|
||
if (stack.empty ())
|
||
error (_("dwarf expression stack underflow"));
|
||
|
||
stack.pop_back ();
|
||
}
|
||
|
||
/* Retrieve the N'th item on the stack. */
|
||
|
||
struct value *
|
||
dwarf_expr_context::fetch (int n)
|
||
{
|
||
if (stack.size () <= n)
|
||
error (_("Asked for position %d of stack, "
|
||
"stack only has %zu elements on it."),
|
||
n, stack.size ());
|
||
return stack[stack.size () - (1 + n)].value;
|
||
}
|
||
|
||
/* Require that TYPE be an integral type; throw an exception if not. */
|
||
|
||
static void
|
||
dwarf_require_integral (struct type *type)
|
||
{
|
||
if (TYPE_CODE (type) != TYPE_CODE_INT
|
||
&& TYPE_CODE (type) != TYPE_CODE_CHAR
|
||
&& TYPE_CODE (type) != TYPE_CODE_BOOL)
|
||
error (_("integral type expected in DWARF expression"));
|
||
}
|
||
|
||
/* Return the unsigned form of TYPE. TYPE is necessarily an integral
|
||
type. */
|
||
|
||
static struct type *
|
||
get_unsigned_type (struct gdbarch *gdbarch, struct type *type)
|
||
{
|
||
switch (TYPE_LENGTH (type))
|
||
{
|
||
case 1:
|
||
return builtin_type (gdbarch)->builtin_uint8;
|
||
case 2:
|
||
return builtin_type (gdbarch)->builtin_uint16;
|
||
case 4:
|
||
return builtin_type (gdbarch)->builtin_uint32;
|
||
case 8:
|
||
return builtin_type (gdbarch)->builtin_uint64;
|
||
default:
|
||
error (_("no unsigned variant found for type, while evaluating "
|
||
"DWARF expression"));
|
||
}
|
||
}
|
||
|
||
/* Return the signed form of TYPE. TYPE is necessarily an integral
|
||
type. */
|
||
|
||
static struct type *
|
||
get_signed_type (struct gdbarch *gdbarch, struct type *type)
|
||
{
|
||
switch (TYPE_LENGTH (type))
|
||
{
|
||
case 1:
|
||
return builtin_type (gdbarch)->builtin_int8;
|
||
case 2:
|
||
return builtin_type (gdbarch)->builtin_int16;
|
||
case 4:
|
||
return builtin_type (gdbarch)->builtin_int32;
|
||
case 8:
|
||
return builtin_type (gdbarch)->builtin_int64;
|
||
default:
|
||
error (_("no signed variant found for type, while evaluating "
|
||
"DWARF expression"));
|
||
}
|
||
}
|
||
|
||
/* Retrieve the N'th item on the stack, converted to an address. */
|
||
|
||
CORE_ADDR
|
||
dwarf_expr_context::fetch_address (int n)
|
||
{
|
||
struct value *result_val = fetch (n);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (this->gdbarch);
|
||
ULONGEST result;
|
||
|
||
dwarf_require_integral (value_type (result_val));
|
||
result = extract_unsigned_integer (value_contents (result_val),
|
||
TYPE_LENGTH (value_type (result_val)),
|
||
byte_order);
|
||
|
||
/* For most architectures, calling extract_unsigned_integer() alone
|
||
is sufficient for extracting an address. However, some
|
||
architectures (e.g. MIPS) use signed addresses and using
|
||
extract_unsigned_integer() will not produce a correct
|
||
result. Make sure we invoke gdbarch_integer_to_address()
|
||
for those architectures which require it. */
|
||
if (gdbarch_integer_to_address_p (this->gdbarch))
|
||
{
|
||
gdb_byte *buf = (gdb_byte *) alloca (this->addr_size);
|
||
struct type *int_type = get_unsigned_type (this->gdbarch,
|
||
value_type (result_val));
|
||
|
||
store_unsigned_integer (buf, this->addr_size, byte_order, result);
|
||
return gdbarch_integer_to_address (this->gdbarch, int_type, buf);
|
||
}
|
||
|
||
return (CORE_ADDR) result;
|
||
}
|
||
|
||
/* Retrieve the in_stack_memory flag of the N'th item on the stack. */
|
||
|
||
bool
|
||
dwarf_expr_context::fetch_in_stack_memory (int n)
|
||
{
|
||
if (stack.size () <= n)
|
||
error (_("Asked for position %d of stack, "
|
||
"stack only has %zu elements on it."),
|
||
n, stack.size ());
|
||
return stack[stack.size () - (1 + n)].in_stack_memory;
|
||
}
|
||
|
||
/* Return true if the expression stack is empty. */
|
||
|
||
bool
|
||
dwarf_expr_context::stack_empty_p () const
|
||
{
|
||
return stack.empty ();
|
||
}
|
||
|
||
/* Add a new piece to the dwarf_expr_context's piece list. */
|
||
void
|
||
dwarf_expr_context::add_piece (ULONGEST size, ULONGEST offset)
|
||
{
|
||
this->pieces.emplace_back ();
|
||
dwarf_expr_piece &p = this->pieces.back ();
|
||
|
||
p.location = this->location;
|
||
p.size = size;
|
||
p.offset = offset;
|
||
|
||
if (p.location == DWARF_VALUE_LITERAL)
|
||
{
|
||
p.v.literal.data = this->data;
|
||
p.v.literal.length = this->len;
|
||
}
|
||
else if (stack_empty_p ())
|
||
{
|
||
p.location = DWARF_VALUE_OPTIMIZED_OUT;
|
||
/* Also reset the context's location, for our callers. This is
|
||
a somewhat strange approach, but this lets us avoid setting
|
||
the location to DWARF_VALUE_MEMORY in all the individual
|
||
cases in the evaluator. */
|
||
this->location = DWARF_VALUE_OPTIMIZED_OUT;
|
||
}
|
||
else if (p.location == DWARF_VALUE_MEMORY)
|
||
{
|
||
p.v.mem.addr = fetch_address (0);
|
||
p.v.mem.in_stack_memory = fetch_in_stack_memory (0);
|
||
}
|
||
else if (p.location == DWARF_VALUE_IMPLICIT_POINTER)
|
||
{
|
||
p.v.ptr.die_sect_off = (sect_offset) this->len;
|
||
p.v.ptr.offset = value_as_long (fetch (0));
|
||
}
|
||
else if (p.location == DWARF_VALUE_REGISTER)
|
||
p.v.regno = value_as_long (fetch (0));
|
||
else
|
||
{
|
||
p.v.value = fetch (0);
|
||
}
|
||
}
|
||
|
||
/* Evaluate the expression at ADDR (LEN bytes long). */
|
||
|
||
void
|
||
dwarf_expr_context::eval (const gdb_byte *addr, size_t len)
|
||
{
|
||
int old_recursion_depth = this->recursion_depth;
|
||
|
||
execute_stack_op (addr, addr + len);
|
||
|
||
/* RECURSION_DEPTH becomes invalid if an exception was thrown here. */
|
||
|
||
gdb_assert (this->recursion_depth == old_recursion_depth);
|
||
}
|
||
|
||
/* Helper to read a uleb128 value or throw an error. */
|
||
|
||
const gdb_byte *
|
||
safe_read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
|
||
uint64_t *r)
|
||
{
|
||
buf = gdb_read_uleb128 (buf, buf_end, r);
|
||
if (buf == NULL)
|
||
error (_("DWARF expression error: ran off end of buffer reading uleb128 value"));
|
||
return buf;
|
||
}
|
||
|
||
/* Helper to read a sleb128 value or throw an error. */
|
||
|
||
const gdb_byte *
|
||
safe_read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end,
|
||
int64_t *r)
|
||
{
|
||
buf = gdb_read_sleb128 (buf, buf_end, r);
|
||
if (buf == NULL)
|
||
error (_("DWARF expression error: ran off end of buffer reading sleb128 value"));
|
||
return buf;
|
||
}
|
||
|
||
const gdb_byte *
|
||
safe_skip_leb128 (const gdb_byte *buf, const gdb_byte *buf_end)
|
||
{
|
||
buf = gdb_skip_leb128 (buf, buf_end);
|
||
if (buf == NULL)
|
||
error (_("DWARF expression error: ran off end of buffer reading leb128 value"));
|
||
return buf;
|
||
}
|
||
|
||
|
||
/* Check that the current operator is either at the end of an
|
||
expression, or that it is followed by a composition operator or by
|
||
DW_OP_GNU_uninit (which should terminate the expression). */
|
||
|
||
void
|
||
dwarf_expr_require_composition (const gdb_byte *op_ptr, const gdb_byte *op_end,
|
||
const char *op_name)
|
||
{
|
||
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: `%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);
|
||
}
|
||
|
||
/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_reg* return the
|
||
DWARF register number. Otherwise return -1. */
|
||
|
||
int
|
||
dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end)
|
||
{
|
||
uint64_t dwarf_reg;
|
||
|
||
if (buf_end <= buf)
|
||
return -1;
|
||
if (*buf >= DW_OP_reg0 && *buf <= DW_OP_reg31)
|
||
{
|
||
if (buf_end - buf != 1)
|
||
return -1;
|
||
return *buf - DW_OP_reg0;
|
||
}
|
||
|
||
if (*buf == DW_OP_regval_type || *buf == DW_OP_GNU_regval_type)
|
||
{
|
||
buf++;
|
||
buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
|
||
if (buf == NULL)
|
||
return -1;
|
||
buf = gdb_skip_leb128 (buf, buf_end);
|
||
if (buf == NULL)
|
||
return -1;
|
||
}
|
||
else if (*buf == DW_OP_regx)
|
||
{
|
||
buf++;
|
||
buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
|
||
if (buf == NULL)
|
||
return -1;
|
||
}
|
||
else
|
||
return -1;
|
||
if (buf != buf_end || (int) dwarf_reg != dwarf_reg)
|
||
return -1;
|
||
return dwarf_reg;
|
||
}
|
||
|
||
/* If <BUF..BUF_END] contains DW_FORM_block* with just DW_OP_breg*(0) and
|
||
DW_OP_deref* return the DWARF register number. Otherwise return -1.
|
||
DEREF_SIZE_RETURN contains -1 for DW_OP_deref; otherwise it contains the
|
||
size from DW_OP_deref_size. */
|
||
|
||
int
|
||
dwarf_block_to_dwarf_reg_deref (const gdb_byte *buf, const gdb_byte *buf_end,
|
||
CORE_ADDR *deref_size_return)
|
||
{
|
||
uint64_t dwarf_reg;
|
||
int64_t offset;
|
||
|
||
if (buf_end <= buf)
|
||
return -1;
|
||
|
||
if (*buf >= DW_OP_breg0 && *buf <= DW_OP_breg31)
|
||
{
|
||
dwarf_reg = *buf - DW_OP_breg0;
|
||
buf++;
|
||
if (buf >= buf_end)
|
||
return -1;
|
||
}
|
||
else if (*buf == DW_OP_bregx)
|
||
{
|
||
buf++;
|
||
buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
|
||
if (buf == NULL)
|
||
return -1;
|
||
if ((int) dwarf_reg != dwarf_reg)
|
||
return -1;
|
||
}
|
||
else
|
||
return -1;
|
||
|
||
buf = gdb_read_sleb128 (buf, buf_end, &offset);
|
||
if (buf == NULL)
|
||
return -1;
|
||
if (offset != 0)
|
||
return -1;
|
||
|
||
if (*buf == DW_OP_deref)
|
||
{
|
||
buf++;
|
||
*deref_size_return = -1;
|
||
}
|
||
else if (*buf == DW_OP_deref_size)
|
||
{
|
||
buf++;
|
||
if (buf >= buf_end)
|
||
return -1;
|
||
*deref_size_return = *buf++;
|
||
}
|
||
else
|
||
return -1;
|
||
|
||
if (buf != buf_end)
|
||
return -1;
|
||
|
||
return dwarf_reg;
|
||
}
|
||
|
||
/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_fbreg(X) fill
|
||
in FB_OFFSET_RETURN with the X offset and return 1. Otherwise return 0. */
|
||
|
||
int
|
||
dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end,
|
||
CORE_ADDR *fb_offset_return)
|
||
{
|
||
int64_t fb_offset;
|
||
|
||
if (buf_end <= buf)
|
||
return 0;
|
||
|
||
if (*buf != DW_OP_fbreg)
|
||
return 0;
|
||
buf++;
|
||
|
||
buf = gdb_read_sleb128 (buf, buf_end, &fb_offset);
|
||
if (buf == NULL)
|
||
return 0;
|
||
*fb_offset_return = fb_offset;
|
||
if (buf != buf_end || fb_offset != (LONGEST) *fb_offset_return)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* If <BUF..BUF_END] contains DW_FORM_block* with single DW_OP_bregSP(X) fill
|
||
in SP_OFFSET_RETURN with the X offset and return 1. Otherwise return 0.
|
||
The matched SP register number depends on GDBARCH. */
|
||
|
||
int
|
||
dwarf_block_to_sp_offset (struct gdbarch *gdbarch, const gdb_byte *buf,
|
||
const gdb_byte *buf_end, CORE_ADDR *sp_offset_return)
|
||
{
|
||
uint64_t dwarf_reg;
|
||
int64_t sp_offset;
|
||
|
||
if (buf_end <= buf)
|
||
return 0;
|
||
if (*buf >= DW_OP_breg0 && *buf <= DW_OP_breg31)
|
||
{
|
||
dwarf_reg = *buf - DW_OP_breg0;
|
||
buf++;
|
||
}
|
||
else
|
||
{
|
||
if (*buf != DW_OP_bregx)
|
||
return 0;
|
||
buf++;
|
||
buf = gdb_read_uleb128 (buf, buf_end, &dwarf_reg);
|
||
if (buf == NULL)
|
||
return 0;
|
||
}
|
||
|
||
if (dwarf_reg_to_regnum (gdbarch, dwarf_reg)
|
||
!= gdbarch_sp_regnum (gdbarch))
|
||
return 0;
|
||
|
||
buf = gdb_read_sleb128 (buf, buf_end, &sp_offset);
|
||
if (buf == NULL)
|
||
return 0;
|
||
*sp_offset_return = sp_offset;
|
||
if (buf != buf_end || sp_offset != (LONGEST) *sp_offset_return)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* The engine for the expression evaluator. Using the context in this
|
||
object, evaluate the expression between OP_PTR and OP_END. */
|
||
|
||
void
|
||
dwarf_expr_context::execute_stack_op (const gdb_byte *op_ptr,
|
||
const gdb_byte *op_end)
|
||
{
|
||
enum bfd_endian byte_order = gdbarch_byte_order (this->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 = this->address_type ();
|
||
|
||
this->location = DWARF_VALUE_MEMORY;
|
||
this->initialized = 1; /* Default is initialized. */
|
||
|
||
if (this->recursion_depth > this->max_recursion_depth)
|
||
error (_("DWARF-2 expression error: Loop detected (%d)."),
|
||
this->recursion_depth);
|
||
this->recursion_depth++;
|
||
|
||
while (op_ptr < op_end)
|
||
{
|
||
enum dwarf_location_atom op = (enum dwarf_location_atom) *op_ptr++;
|
||
ULONGEST result;
|
||
/* Assume the value is not in stack memory.
|
||
Code that knows otherwise sets this to true.
|
||
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 false. */
|
||
bool in_stack_memory = false;
|
||
uint64_t uoffset, reg;
|
||
int64_t offset;
|
||
struct value *result_val = NULL;
|
||
|
||
/* The DWARF expression might have a bug causing an infinite
|
||
loop. In that case, quitting is the only way out. */
|
||
QUIT;
|
||
|
||
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,
|
||
this->addr_size, byte_order);
|
||
op_ptr += this->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 += this->offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
|
||
case DW_OP_GNU_addr_index:
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
result = this->get_addr_index (uoffset);
|
||
result += this->offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_GNU_const_index:
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
result = this->get_addr_index (uoffset);
|
||
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 = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
result = uoffset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
case DW_OP_consts:
|
||
op_ptr = safe_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:
|
||
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_reg");
|
||
|
||
result = op - DW_OP_reg0;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
this->location = DWARF_VALUE_REGISTER;
|
||
break;
|
||
|
||
case DW_OP_regx:
|
||
op_ptr = safe_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);
|
||
this->location = DWARF_VALUE_REGISTER;
|
||
break;
|
||
|
||
case DW_OP_implicit_value:
|
||
{
|
||
uint64_t len;
|
||
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &len);
|
||
if (op_ptr + len > op_end)
|
||
error (_("DW_OP_implicit_value: too few bytes available."));
|
||
this->len = len;
|
||
this->data = op_ptr;
|
||
this->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:
|
||
this->location = DWARF_VALUE_STACK;
|
||
dwarf_expr_require_composition (op_ptr, op_end, "DW_OP_stack_value");
|
||
goto no_push;
|
||
|
||
case DW_OP_implicit_pointer:
|
||
case DW_OP_GNU_implicit_pointer:
|
||
{
|
||
int64_t len;
|
||
|
||
if (this->ref_addr_size == -1)
|
||
error (_("DWARF-2 expression error: DW_OP_implicit_pointer "
|
||
"is not allowed in frame context"));
|
||
|
||
/* The referred-to DIE of sect_offset kind. */
|
||
this->len = extract_unsigned_integer (op_ptr, this->ref_addr_size,
|
||
byte_order);
|
||
op_ptr += this->ref_addr_size;
|
||
|
||
/* The byte offset into the data. */
|
||
op_ptr = safe_read_sleb128 (op_ptr, op_end, &len);
|
||
result = (ULONGEST) len;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
|
||
this->location = DWARF_VALUE_IMPLICIT_POINTER;
|
||
dwarf_expr_require_composition (op_ptr, op_end,
|
||
"DW_OP_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 = safe_read_sleb128 (op_ptr, op_end, &offset);
|
||
result = this->read_addr_from_reg (op - DW_OP_breg0);
|
||
result += offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
}
|
||
break;
|
||
case DW_OP_bregx:
|
||
{
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
|
||
op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
|
||
result = this->read_addr_from_reg (reg);
|
||
result += offset;
|
||
result_val = value_from_ulongest (address_type, result);
|
||
}
|
||
break;
|
||
case DW_OP_fbreg:
|
||
{
|
||
const gdb_byte *datastart;
|
||
size_t datalen;
|
||
|
||
op_ptr = safe_read_sleb128 (op_ptr, op_end, &offset);
|
||
|
||
/* Rather than create a whole new context, we simply
|
||
backup the current stack locally and install a new empty stack,
|
||
then reset it afterwards, effectively erasing whatever the
|
||
recursive call put there. */
|
||
std::vector<dwarf_stack_value> saved_stack = std::move (stack);
|
||
stack.clear ();
|
||
|
||
/* FIXME: cagney/2003-03-26: This code should be using
|
||
get_frame_base_address(), and then implement a dwarf2
|
||
specific this_base method. */
|
||
this->get_frame_base (&datastart, &datalen);
|
||
eval (datastart, datalen);
|
||
if (this->location == DWARF_VALUE_MEMORY)
|
||
result = fetch_address (0);
|
||
else if (this->location == DWARF_VALUE_REGISTER)
|
||
result = this->read_addr_from_reg (value_as_long (fetch (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 = true;
|
||
|
||
/* Restore the content of the original stack. */
|
||
stack = std::move (saved_stack);
|
||
|
||
this->location = DWARF_VALUE_MEMORY;
|
||
}
|
||
break;
|
||
|
||
case DW_OP_dup:
|
||
result_val = fetch (0);
|
||
in_stack_memory = fetch_in_stack_memory (0);
|
||
break;
|
||
|
||
case DW_OP_drop:
|
||
pop ();
|
||
goto no_push;
|
||
|
||
case DW_OP_pick:
|
||
offset = *op_ptr++;
|
||
result_val = fetch (offset);
|
||
in_stack_memory = fetch_in_stack_memory (offset);
|
||
break;
|
||
|
||
case DW_OP_swap:
|
||
{
|
||
if (stack.size () < 2)
|
||
error (_("Not enough elements for "
|
||
"DW_OP_swap. Need 2, have %zu."),
|
||
stack.size ());
|
||
|
||
dwarf_stack_value &t1 = stack[stack.size () - 1];
|
||
dwarf_stack_value &t2 = stack[stack.size () - 2];
|
||
std::swap (t1, t2);
|
||
goto no_push;
|
||
}
|
||
|
||
case DW_OP_over:
|
||
result_val = fetch (1);
|
||
in_stack_memory = fetch_in_stack_memory (1);
|
||
break;
|
||
|
||
case DW_OP_rot:
|
||
{
|
||
if (stack.size () < 3)
|
||
error (_("Not enough elements for "
|
||
"DW_OP_rot. Need 3, have %zu."),
|
||
stack.size ());
|
||
|
||
dwarf_stack_value temp = stack[stack.size () - 1];
|
||
stack[stack.size () - 1] = stack[stack.size () - 2];
|
||
stack[stack.size () - 2] = stack[stack.size () - 3];
|
||
stack[stack.size () - 3] = temp;
|
||
goto no_push;
|
||
}
|
||
|
||
case DW_OP_deref:
|
||
case DW_OP_deref_size:
|
||
case DW_OP_deref_type:
|
||
case DW_OP_GNU_deref_type:
|
||
{
|
||
int addr_size = (op == DW_OP_deref ? this->addr_size : *op_ptr++);
|
||
gdb_byte *buf = (gdb_byte *) alloca (addr_size);
|
||
CORE_ADDR addr = fetch_address (0);
|
||
struct type *type;
|
||
|
||
pop ();
|
||
|
||
if (op == DW_OP_deref_type || op == DW_OP_GNU_deref_type)
|
||
{
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
cu_offset type_die_cu_off = (cu_offset) uoffset;
|
||
type = get_base_type (type_die_cu_off, 0);
|
||
}
|
||
else
|
||
type = address_type;
|
||
|
||
this->read_mem (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 = (gdb_byte *) 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 = fetch (0);
|
||
pop ();
|
||
|
||
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 = safe_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 = fetch (0);
|
||
pop ();
|
||
|
||
first = fetch (0);
|
||
pop ();
|
||
|
||
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 (this->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 (this->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 (this->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 = this->get_frame_cfa ();
|
||
result_val = value_from_ulongest (address_type, result);
|
||
in_stack_memory = true;
|
||
break;
|
||
|
||
case DW_OP_GNU_push_tls_address:
|
||
case DW_OP_form_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 (fetch (0));
|
||
pop ();
|
||
result = this->get_tls_address (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 = fetch (0);
|
||
dwarf_require_integral (value_type (val));
|
||
if (value_as_long (val) != 0)
|
||
op_ptr += offset;
|
||
pop ();
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_nop:
|
||
goto no_push;
|
||
|
||
case DW_OP_piece:
|
||
{
|
||
uint64_t size;
|
||
|
||
/* Record the piece. */
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &size);
|
||
add_piece (8 * size, 0);
|
||
|
||
/* Pop off the address/regnum, and reset the location
|
||
type. */
|
||
if (this->location != DWARF_VALUE_LITERAL
|
||
&& this->location != DWARF_VALUE_OPTIMIZED_OUT)
|
||
pop ();
|
||
this->location = DWARF_VALUE_MEMORY;
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_bit_piece:
|
||
{
|
||
uint64_t size, offset;
|
||
|
||
/* Record the piece. */
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &size);
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &offset);
|
||
add_piece (size, offset);
|
||
|
||
/* Pop off the address/regnum, and reset the location
|
||
type. */
|
||
if (this->location != DWARF_VALUE_LITERAL
|
||
&& this->location != DWARF_VALUE_OPTIMIZED_OUT)
|
||
pop ();
|
||
this->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."));
|
||
|
||
this->initialized = 0;
|
||
goto no_push;
|
||
|
||
case DW_OP_call2:
|
||
{
|
||
cu_offset cu_off
|
||
= (cu_offset) extract_unsigned_integer (op_ptr, 2, byte_order);
|
||
op_ptr += 2;
|
||
this->dwarf_call (cu_off);
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_call4:
|
||
{
|
||
cu_offset cu_off
|
||
= (cu_offset) extract_unsigned_integer (op_ptr, 4, byte_order);
|
||
op_ptr += 4;
|
||
this->dwarf_call (cu_off);
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_entry_value:
|
||
case DW_OP_GNU_entry_value:
|
||
{
|
||
uint64_t len;
|
||
CORE_ADDR deref_size;
|
||
union call_site_parameter_u kind_u;
|
||
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &len);
|
||
if (op_ptr + len > op_end)
|
||
error (_("DW_OP_entry_value: too few bytes available."));
|
||
|
||
kind_u.dwarf_reg = dwarf_block_to_dwarf_reg (op_ptr, op_ptr + len);
|
||
if (kind_u.dwarf_reg != -1)
|
||
{
|
||
op_ptr += len;
|
||
this->push_dwarf_reg_entry_value (CALL_SITE_PARAMETER_DWARF_REG,
|
||
kind_u,
|
||
-1 /* deref_size */);
|
||
goto no_push;
|
||
}
|
||
|
||
kind_u.dwarf_reg = dwarf_block_to_dwarf_reg_deref (op_ptr,
|
||
op_ptr + len,
|
||
&deref_size);
|
||
if (kind_u.dwarf_reg != -1)
|
||
{
|
||
if (deref_size == -1)
|
||
deref_size = this->addr_size;
|
||
op_ptr += len;
|
||
this->push_dwarf_reg_entry_value (CALL_SITE_PARAMETER_DWARF_REG,
|
||
kind_u, deref_size);
|
||
goto no_push;
|
||
}
|
||
|
||
error (_("DWARF-2 expression error: DW_OP_entry_value is "
|
||
"supported only for single DW_OP_reg* "
|
||
"or for DW_OP_breg*(0)+DW_OP_deref*"));
|
||
}
|
||
|
||
case DW_OP_GNU_parameter_ref:
|
||
{
|
||
union call_site_parameter_u kind_u;
|
||
|
||
kind_u.param_cu_off
|
||
= (cu_offset) extract_unsigned_integer (op_ptr, 4, byte_order);
|
||
op_ptr += 4;
|
||
this->push_dwarf_reg_entry_value (CALL_SITE_PARAMETER_PARAM_OFFSET,
|
||
kind_u,
|
||
-1 /* deref_size */);
|
||
}
|
||
goto no_push;
|
||
|
||
case DW_OP_const_type:
|
||
case DW_OP_GNU_const_type:
|
||
{
|
||
int n;
|
||
const gdb_byte *data;
|
||
struct type *type;
|
||
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
cu_offset type_die_cu_off = (cu_offset) uoffset;
|
||
|
||
n = *op_ptr++;
|
||
data = op_ptr;
|
||
op_ptr += n;
|
||
|
||
type = get_base_type (type_die_cu_off, n);
|
||
result_val = value_from_contents (type, data);
|
||
}
|
||
break;
|
||
|
||
case DW_OP_regval_type:
|
||
case DW_OP_GNU_regval_type:
|
||
{
|
||
struct type *type;
|
||
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, ®);
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
cu_offset type_die_cu_off = (cu_offset) uoffset;
|
||
|
||
type = get_base_type (type_die_cu_off, 0);
|
||
result_val = this->get_reg_value (type, reg);
|
||
}
|
||
break;
|
||
|
||
case DW_OP_convert:
|
||
case DW_OP_GNU_convert:
|
||
case DW_OP_reinterpret:
|
||
case DW_OP_GNU_reinterpret:
|
||
{
|
||
struct type *type;
|
||
|
||
op_ptr = safe_read_uleb128 (op_ptr, op_end, &uoffset);
|
||
cu_offset type_die_cu_off = (cu_offset) uoffset;
|
||
|
||
if (to_underlying (type_die_cu_off) == 0)
|
||
type = address_type;
|
||
else
|
||
type = get_base_type (type_die_cu_off, 0);
|
||
|
||
result_val = fetch (0);
|
||
pop ();
|
||
|
||
if (op == DW_OP_convert || 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_reinterpret has wrong size"));
|
||
else
|
||
result_val
|
||
= value_from_contents (type,
|
||
value_contents_all (result_val));
|
||
}
|
||
break;
|
||
|
||
case DW_OP_push_object_address:
|
||
/* Return the address of the object we are currently observing. */
|
||
result = this->get_object_address ();
|
||
result_val = value_from_ulongest (address_type, result);
|
||
break;
|
||
|
||
default:
|
||
error (_("Unhandled dwarf expression opcode 0x%x"), op);
|
||
}
|
||
|
||
/* Most things push a result value. */
|
||
gdb_assert (result_val != NULL);
|
||
push (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 (this->location == DWARF_VALUE_IMPLICIT_POINTER)
|
||
add_piece (8 * this->addr_size, 0);
|
||
|
||
this->recursion_depth--;
|
||
gdb_assert (this->recursion_depth >= 0);
|
||
}
|
||
|
||
void
|
||
_initialize_dwarf2expr (void)
|
||
{
|
||
dwarf_arch_cookie
|
||
= gdbarch_data_register_post_init (dwarf_gdbarch_types_init);
|
||
}
|