/* Low level packing and unpacking of values for GDB, the GNU Debugger.
- Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
- 2009, 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 1986-2014 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "arch-utils.h"
-#include "gdb_string.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "value.h"
#include "language.h"
#include "demangle.h"
#include "doublest.h"
-#include "gdb_assert.h"
#include "regcache.h"
#include "block.h"
#include "dfp.h"
#include "objfiles.h"
#include "valprint.h"
#include "cli/cli-decode.h"
-#include "exceptions.h"
-#include "python/python.h"
-
+#include "extension.h"
+#include <ctype.h>
#include "tracepoint.h"
+#include "cp-abi.h"
+#include "user-regs.h"
/* Prototypes for exported functions. */
static struct cmd_list_element *functionlist;
+/* Note that the fields in this structure are arranged to save a bit
+ of memory. */
+
struct value
{
/* Type of value; either not an lval, or one of the various
enum lval_type lval;
/* Is it modifiable? Only relevant if lval != not_lval. */
- int modifiable;
+ unsigned int modifiable : 1;
+
+ /* If zero, contents of this value are in the contents field. If
+ nonzero, contents are in inferior. If the lval field is lval_memory,
+ the contents are in inferior memory at location.address plus offset.
+ The lval field may also be lval_register.
+
+ WARNING: This field is used by the code which handles watchpoints
+ (see breakpoint.c) to decide whether a particular value can be
+ watched by hardware watchpoints. If the lazy flag is set for
+ some member of a value chain, it is assumed that this member of
+ the chain doesn't need to be watched as part of watching the
+ value itself. This is how GDB avoids watching the entire struct
+ or array when the user wants to watch a single struct member or
+ array element. If you ever change the way lazy flag is set and
+ reset, be sure to consider this use as well! */
+ unsigned int lazy : 1;
+
+ /* If value is a variable, is it initialized or not. */
+ unsigned int initialized : 1;
+
+ /* If value is from the stack. If this is set, read_stack will be
+ used instead of read_memory to enable extra caching. */
+ unsigned int stack : 1;
+
+ /* If the value has been released. */
+ unsigned int released : 1;
+
+ /* Register number if the value is from a register. */
+ short regnum;
/* Location of value (if lval). */
union
/* Pointer to internal variable. */
struct internalvar *internalvar;
+ /* Pointer to xmethod worker. */
+ struct xmethod_worker *xm_worker;
+
/* If lval == lval_computed, this is a set of function pointers
to use to access and describe the value, and a closure pointer
for them to use. */
struct
{
- struct lval_funcs *funcs; /* Functions to call. */
- void *closure; /* Closure for those functions to use. */
+ /* Functions to call. */
+ const struct lval_funcs *funcs;
+
+ /* Closure for those functions to use. */
+ void *closure;
} computed;
} location;
gdbarch_bits_big_endian=1 targets, it is the position of the MSB. */
int bitpos;
+ /* The number of references to this value. When a value is created,
+ the value chain holds a reference, so REFERENCE_COUNT is 1. If
+ release_value is called, this value is removed from the chain but
+ the caller of release_value now has a reference to this value.
+ The caller must arrange for a call to value_free later. */
+ int reference_count;
+
/* Only used for bitfields; the containing value. This allows a
single read from the target when displaying multiple
bitfields. */
taken off this list. */
struct value *next;
- /* Register number if the value is from a register. */
- short regnum;
-
- /* If zero, contents of this value are in the contents field. If
- nonzero, contents are in inferior. If the lval field is lval_memory,
- the contents are in inferior memory at location.address plus offset.
- The lval field may also be lval_register.
-
- WARNING: This field is used by the code which handles watchpoints
- (see breakpoint.c) to decide whether a particular value can be
- watched by hardware watchpoints. If the lazy flag is set for
- some member of a value chain, it is assumed that this member of
- the chain doesn't need to be watched as part of watching the
- value itself. This is how GDB avoids watching the entire struct
- or array when the user wants to watch a single struct member or
- array element. If you ever change the way lazy flag is set and
- reset, be sure to consider this use as well! */
- char lazy;
-
- /* If nonzero, this is the value of a variable which does not
- actually exist in the program. */
- char optimized_out;
-
- /* If value is a variable, is it initialized or not. */
- int initialized;
-
- /* If value is from the stack. If this is set, read_stack will be
- used instead of read_memory to enable extra caching. */
- int stack;
-
/* Actual contents of the value. Target byte-order. NULL or not
valid if lazy is nonzero. */
gdb_byte *contents;
/* Unavailable ranges in CONTENTS. We mark unavailable ranges,
rather than available, since the common and default case is for a
- value to be available. This is filled in at value read time. */
+ value to be available. This is filled in at value read time.
+ The unavailable ranges are tracked in bits. Note that a contents
+ bit that has been optimized out doesn't really exist in the
+ program, so it can't be marked unavailable either. */
VEC(range_s) *unavailable;
- /* The number of references to this value. When a value is created,
- the value chain holds a reference, so REFERENCE_COUNT is 1. If
- release_value is called, this value is removed from the chain but
- the caller of release_value now has a reference to this value.
- The caller must arrange for a call to value_free later. */
- int reference_count;
+ /* Likewise, but for optimized out contents (a chunk of the value of
+ a variable that does not actually exist in the program). If LVAL
+ is lval_register, this is a register ($pc, $sp, etc., never a
+ program variable) that has not been saved in the frame. Not
+ saved registers and optimized-out program variables values are
+ treated pretty much the same, except not-saved registers have a
+ different string representation and related error strings. */
+ VEC(range_s) *optimized_out;
};
int
-value_bytes_available (const struct value *value, int offset, int length)
+value_bits_available (const struct value *value, int offset, int length)
{
gdb_assert (!value->lazy);
}
int
+value_bytes_available (const struct value *value, int offset, int length)
+{
+ return value_bits_available (value,
+ offset * TARGET_CHAR_BIT,
+ length * TARGET_CHAR_BIT);
+}
+
+int
+value_bits_any_optimized_out (const struct value *value, int bit_offset, int bit_length)
+{
+ gdb_assert (!value->lazy);
+
+ return ranges_contain (value->optimized_out, bit_offset, bit_length);
+}
+
+int
value_entirely_available (struct value *value)
{
/* We can only tell whether the whole value is available when we try
return 0;
}
-void
-mark_value_bytes_unavailable (struct value *value, int offset, int length)
+/* Returns true if VALUE is entirely covered by RANGES. If the value
+ is lazy, it'll be read now. Note that RANGE is a pointer to
+ pointer because reading the value might change *RANGE. */
+
+static int
+value_entirely_covered_by_range_vector (struct value *value,
+ VEC(range_s) **ranges)
+{
+ /* We can only tell whether the whole value is optimized out /
+ unavailable when we try to read it. */
+ if (value->lazy)
+ value_fetch_lazy (value);
+
+ if (VEC_length (range_s, *ranges) == 1)
+ {
+ struct range *t = VEC_index (range_s, *ranges, 0);
+
+ if (t->offset == 0
+ && t->length == (TARGET_CHAR_BIT
+ * TYPE_LENGTH (value_enclosing_type (value))))
+ return 1;
+ }
+
+ return 0;
+}
+
+int
+value_entirely_unavailable (struct value *value)
+{
+ return value_entirely_covered_by_range_vector (value, &value->unavailable);
+}
+
+int
+value_entirely_optimized_out (struct value *value)
+{
+ return value_entirely_covered_by_range_vector (value, &value->optimized_out);
+}
+
+/* Insert into the vector pointed to by VECTORP the bit range starting of
+ OFFSET bits, and extending for the next LENGTH bits. */
+
+static void
+insert_into_bit_range_vector (VEC(range_s) **vectorp, int offset, int length)
{
range_s newr;
int i;
*/
- i = VEC_lower_bound (range_s, value->unavailable, &newr, range_lessthan);
+ i = VEC_lower_bound (range_s, *vectorp, &newr, range_lessthan);
if (i > 0)
{
- struct range *bef = VEC_index (range_s, value->unavailable, i - 1);
+ struct range *bef = VEC_index (range_s, *vectorp, i - 1);
if (ranges_overlap (bef->offset, bef->length, offset, length))
{
else
{
/* #3 */
- VEC_safe_insert (range_s, value->unavailable, i, &newr);
+ VEC_safe_insert (range_s, *vectorp, i, &newr);
}
}
else
{
/* #4 */
- VEC_safe_insert (range_s, value->unavailable, i, &newr);
+ VEC_safe_insert (range_s, *vectorp, i, &newr);
}
/* Check whether the ranges following the one we've just added or
touched can be folded in (#5 above). */
- if (i + 1 < VEC_length (range_s, value->unavailable))
+ if (i + 1 < VEC_length (range_s, *vectorp))
{
struct range *t;
struct range *r;
int next = i + 1;
/* Get the range we just touched. */
- t = VEC_index (range_s, value->unavailable, i);
+ t = VEC_index (range_s, *vectorp, i);
removed = 0;
i = next;
- for (; VEC_iterate (range_s, value->unavailable, i, r); i++)
+ for (; VEC_iterate (range_s, *vectorp, i, r); i++)
if (r->offset <= t->offset + t->length)
{
ULONGEST l, h;
}
if (removed != 0)
- VEC_block_remove (range_s, value->unavailable, next, removed);
+ VEC_block_remove (range_s, *vectorp, next, removed);
}
}
+void
+mark_value_bits_unavailable (struct value *value, int offset, int length)
+{
+ insert_into_bit_range_vector (&value->unavailable, offset, length);
+}
+
+void
+mark_value_bytes_unavailable (struct value *value, int offset, int length)
+{
+ mark_value_bits_unavailable (value,
+ offset * TARGET_CHAR_BIT,
+ length * TARGET_CHAR_BIT);
+}
+
/* Find the first range in RANGES that overlaps the range defined by
OFFSET and LENGTH, starting at element POS in the RANGES vector,
Returns the index into RANGES where such overlapping range was
return -1;
}
-int
-value_available_contents_eq (const struct value *val1, int offset1,
- const struct value *val2, int offset2,
- int length)
-{
- int org_len = length;
- int org_offset1 = offset1;
- int org_offset2 = offset2;
- int idx1 = 0, idx2 = 0;
- int prev_avail;
-
- /* This routine is used by printing routines, where we should
- already have read the value. Note that we only know whether a
- value chunk is available if we've tried to read it. */
- gdb_assert (!val1->lazy && !val2->lazy);
+/* Compare LENGTH_BITS of memory at PTR1 + OFFSET1_BITS with the memory at
+ PTR2 + OFFSET2_BITS. Return 0 if the memory is the same, otherwise
+ return non-zero.
- /* The offset from either ORG_OFFSET1 or ORG_OFFSET2 where the
- available contents we haven't compared yet start. */
- prev_avail = 0;
+ It must always be the case that:
+ OFFSET1_BITS % TARGET_CHAR_BIT == OFFSET2_BITS % TARGET_CHAR_BIT
- while (length > 0)
+ It is assumed that memory can be accessed from:
+ PTR + (OFFSET_BITS / TARGET_CHAR_BIT)
+ to:
+ PTR + ((OFFSET_BITS + LENGTH_BITS + TARGET_CHAR_BIT - 1)
+ / TARGET_CHAR_BIT) */
+static int
+memcmp_with_bit_offsets (const gdb_byte *ptr1, size_t offset1_bits,
+ const gdb_byte *ptr2, size_t offset2_bits,
+ size_t length_bits)
+{
+ gdb_assert (offset1_bits % TARGET_CHAR_BIT
+ == offset2_bits % TARGET_CHAR_BIT);
+
+ if (offset1_bits % TARGET_CHAR_BIT != 0)
{
- range_s *r1, *r2;
- ULONGEST l1, h1;
- ULONGEST l2, h2;
+ size_t bits;
+ gdb_byte mask, b1, b2;
+
+ /* The offset from the base pointers PTR1 and PTR2 is not a complete
+ number of bytes. A number of bits up to either the next exact
+ byte boundary, or LENGTH_BITS (which ever is sooner) will be
+ compared. */
+ bits = TARGET_CHAR_BIT - offset1_bits % TARGET_CHAR_BIT;
+ gdb_assert (bits < sizeof (mask) * TARGET_CHAR_BIT);
+ mask = (1 << bits) - 1;
+
+ if (length_bits < bits)
+ {
+ mask &= ~(gdb_byte) ((1 << (bits - length_bits)) - 1);
+ bits = length_bits;
+ }
+
+ /* Now load the two bytes and mask off the bits we care about. */
+ b1 = *(ptr1 + offset1_bits / TARGET_CHAR_BIT) & mask;
+ b2 = *(ptr2 + offset2_bits / TARGET_CHAR_BIT) & mask;
+
+ if (b1 != b2)
+ return 1;
+
+ /* Now update the length and offsets to take account of the bits
+ we've just compared. */
+ length_bits -= bits;
+ offset1_bits += bits;
+ offset2_bits += bits;
+ }
+
+ if (length_bits % TARGET_CHAR_BIT != 0)
+ {
+ size_t bits;
+ size_t o1, o2;
+ gdb_byte mask, b1, b2;
+
+ /* The length is not an exact number of bytes. After the previous
+ IF.. block then the offsets are byte aligned, or the
+ length is zero (in which case this code is not reached). Compare
+ a number of bits at the end of the region, starting from an exact
+ byte boundary. */
+ bits = length_bits % TARGET_CHAR_BIT;
+ o1 = offset1_bits + length_bits - bits;
+ o2 = offset2_bits + length_bits - bits;
+
+ gdb_assert (bits < sizeof (mask) * TARGET_CHAR_BIT);
+ mask = ((1 << bits) - 1) << (TARGET_CHAR_BIT - bits);
+
+ gdb_assert (o1 % TARGET_CHAR_BIT == 0);
+ gdb_assert (o2 % TARGET_CHAR_BIT == 0);
+
+ b1 = *(ptr1 + o1 / TARGET_CHAR_BIT) & mask;
+ b2 = *(ptr2 + o2 / TARGET_CHAR_BIT) & mask;
+
+ if (b1 != b2)
+ return 1;
+
+ length_bits -= bits;
+ }
- idx1 = find_first_range_overlap (val1->unavailable, idx1,
+ if (length_bits > 0)
+ {
+ /* We've now taken care of any stray "bits" at the start, or end of
+ the region to compare, the remainder can be covered with a simple
+ memcmp. */
+ gdb_assert (offset1_bits % TARGET_CHAR_BIT == 0);
+ gdb_assert (offset2_bits % TARGET_CHAR_BIT == 0);
+ gdb_assert (length_bits % TARGET_CHAR_BIT == 0);
+
+ return memcmp (ptr1 + offset1_bits / TARGET_CHAR_BIT,
+ ptr2 + offset2_bits / TARGET_CHAR_BIT,
+ length_bits / TARGET_CHAR_BIT);
+ }
+
+ /* Length is zero, regions match. */
+ return 0;
+}
+
+/* Helper struct for find_first_range_overlap_and_match and
+ value_contents_bits_eq. Keep track of which slot of a given ranges
+ vector have we last looked at. */
+
+struct ranges_and_idx
+{
+ /* The ranges. */
+ VEC(range_s) *ranges;
+
+ /* The range we've last found in RANGES. Given ranges are sorted,
+ we can start the next lookup here. */
+ int idx;
+};
+
+/* Helper function for value_contents_bits_eq. Compare LENGTH bits of
+ RP1's ranges starting at OFFSET1 bits with LENGTH bits of RP2's
+ ranges starting at OFFSET2 bits. Return true if the ranges match
+ and fill in *L and *H with the overlapping window relative to
+ (both) OFFSET1 or OFFSET2. */
+
+static int
+find_first_range_overlap_and_match (struct ranges_and_idx *rp1,
+ struct ranges_and_idx *rp2,
+ int offset1, int offset2,
+ int length, ULONGEST *l, ULONGEST *h)
+{
+ rp1->idx = find_first_range_overlap (rp1->ranges, rp1->idx,
offset1, length);
- idx2 = find_first_range_overlap (val2->unavailable, idx2,
+ rp2->idx = find_first_range_overlap (rp2->ranges, rp2->idx,
offset2, length);
- /* The usual case is for both values to be completely available. */
- if (idx1 == -1 && idx2 == -1)
- return (memcmp (val1->contents + org_offset1 + prev_avail,
- val2->contents + org_offset2 + prev_avail,
- org_len - prev_avail) == 0);
- /* The contents only match equal if the available set matches as
- well. */
- else if (idx1 == -1 || idx2 == -1)
- return 0;
-
- gdb_assert (idx1 != -1 && idx2 != -1);
+ if (rp1->idx == -1 && rp2->idx == -1)
+ {
+ *l = length;
+ *h = length;
+ return 1;
+ }
+ else if (rp1->idx == -1 || rp2->idx == -1)
+ return 0;
+ else
+ {
+ range_s *r1, *r2;
+ ULONGEST l1, h1;
+ ULONGEST l2, h2;
- r1 = VEC_index (range_s, val1->unavailable, idx1);
- r2 = VEC_index (range_s, val2->unavailable, idx2);
+ r1 = VEC_index (range_s, rp1->ranges, rp1->idx);
+ r2 = VEC_index (range_s, rp2->ranges, rp2->idx);
/* Get the unavailable windows intersected by the incoming
ranges. The first and last ranges that overlap the argument
h1 = min (offset1 + length, r1->offset + r1->length);
l2 = max (offset2, r2->offset);
- h2 = min (offset2 + length, r2->offset + r2->length);
+ h2 = min (offset2 + length, offset2 + r2->length);
/* Make them relative to the respective start offsets, so we can
compare them for equality. */
l2 -= offset2;
h2 -= offset2;
- /* Different availability, no match. */
+ /* Different ranges, no match. */
if (l1 != l2 || h1 != h2)
return 0;
- /* Compare the _available_ contents. */
- if (memcmp (val1->contents + org_offset1 + prev_avail,
- val2->contents + org_offset2 + prev_avail,
- l2 - prev_avail) != 0)
+ *h = h1;
+ *l = l1;
+ return 1;
+ }
+}
+
+/* Helper function for value_contents_eq. The only difference is that
+ this function is bit rather than byte based.
+
+ Compare LENGTH bits of VAL1's contents starting at OFFSET1 bits
+ with LENGTH bits of VAL2's contents starting at OFFSET2 bits.
+ Return true if the available bits match. */
+
+static int
+value_contents_bits_eq (const struct value *val1, int offset1,
+ const struct value *val2, int offset2,
+ int length)
+{
+ /* Each array element corresponds to a ranges source (unavailable,
+ optimized out). '1' is for VAL1, '2' for VAL2. */
+ struct ranges_and_idx rp1[2], rp2[2];
+
+ /* See function description in value.h. */
+ gdb_assert (!val1->lazy && !val2->lazy);
+
+ /* We shouldn't be trying to compare past the end of the values. */
+ gdb_assert (offset1 + length
+ <= TYPE_LENGTH (val1->enclosing_type) * TARGET_CHAR_BIT);
+ gdb_assert (offset2 + length
+ <= TYPE_LENGTH (val2->enclosing_type) * TARGET_CHAR_BIT);
+
+ memset (&rp1, 0, sizeof (rp1));
+ memset (&rp2, 0, sizeof (rp2));
+ rp1[0].ranges = val1->unavailable;
+ rp2[0].ranges = val2->unavailable;
+ rp1[1].ranges = val1->optimized_out;
+ rp2[1].ranges = val2->optimized_out;
+
+ while (length > 0)
+ {
+ ULONGEST l = 0, h = 0; /* init for gcc -Wall */
+ int i;
+
+ for (i = 0; i < 2; i++)
+ {
+ ULONGEST l_tmp, h_tmp;
+
+ /* The contents only match equal if the invalid/unavailable
+ contents ranges match as well. */
+ if (!find_first_range_overlap_and_match (&rp1[i], &rp2[i],
+ offset1, offset2, length,
+ &l_tmp, &h_tmp))
+ return 0;
+
+ /* We're interested in the lowest/first range found. */
+ if (i == 0 || l_tmp < l)
+ {
+ l = l_tmp;
+ h = h_tmp;
+ }
+ }
+
+ /* Compare the available/valid contents. */
+ if (memcmp_with_bit_offsets (val1->contents, offset1,
+ val2->contents, offset2, l) != 0)
return 0;
- prev_avail += h1;
- length -= h1;
- offset1 += h1;
- offset2 += h1;
+ length -= h;
+ offset1 += h;
+ offset2 += h;
}
return 1;
}
+int
+value_contents_eq (const struct value *val1, int offset1,
+ const struct value *val2, int offset2,
+ int length)
+{
+ return value_contents_bits_eq (val1, offset1 * TARGET_CHAR_BIT,
+ val2, offset2 * TARGET_CHAR_BIT,
+ length * TARGET_CHAR_BIT);
+}
+
/* Prototypes for local functions. */
static void show_values (char *, int);
val->bitsize = 0;
VALUE_REGNUM (val) = -1;
val->lazy = 1;
- val->optimized_out = 0;
val->embedded_offset = 0;
val->pointed_to_offset = 0;
val->modifiable = 1;
/* Allocate the contents of VAL if it has not been allocated yet. */
-void
+static void
allocate_value_contents (struct value *val)
{
if (!val->contents)
struct value *
allocate_computed_value (struct type *type,
- struct lval_funcs *funcs,
+ const struct lval_funcs *funcs,
void *closure)
{
struct value *v = allocate_value_lazy (type);
return v;
}
+/* Allocate NOT_LVAL value for type TYPE being OPTIMIZED_OUT. */
+
+struct value *
+allocate_optimized_out_value (struct type *type)
+{
+ struct value *retval = allocate_value_lazy (type);
+
+ mark_value_bytes_optimized_out (retval, 0, TYPE_LENGTH (type));
+ set_value_lazy (retval, 0);
+ return retval;
+}
+
/* Accessor methods. */
struct value *
return value->parent;
}
+/* See value.h. */
+
+void
+set_value_parent (struct value *value, struct value *parent)
+{
+ struct value *old = value->parent;
+
+ value->parent = parent;
+ if (parent != NULL)
+ value_incref (parent);
+ value_free (old);
+}
+
gdb_byte *
value_contents_raw (struct value *value)
{
return value->enclosing_type;
}
+/* Look at value.h for description. */
+
+struct type *
+value_actual_type (struct value *value, int resolve_simple_types,
+ int *real_type_found)
+{
+ struct value_print_options opts;
+ struct type *result;
+
+ get_user_print_options (&opts);
+
+ if (real_type_found)
+ *real_type_found = 0;
+ result = value_type (value);
+ if (opts.objectprint)
+ {
+ /* If result's target type is TYPE_CODE_STRUCT, proceed to
+ fetch its rtti type. */
+ if ((TYPE_CODE (result) == TYPE_CODE_PTR
+ || TYPE_CODE (result) == TYPE_CODE_REF)
+ && TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (result)))
+ == TYPE_CODE_STRUCT)
+ {
+ struct type *real_type;
+
+ real_type = value_rtti_indirect_type (value, NULL, NULL, NULL);
+ if (real_type)
+ {
+ if (real_type_found)
+ *real_type_found = 1;
+ result = real_type;
+ }
+ }
+ else if (resolve_simple_types)
+ {
+ if (real_type_found)
+ *real_type_found = 1;
+ result = value_enclosing_type (value);
+ }
+ }
+
+ return result;
+}
+
+void
+error_value_optimized_out (void)
+{
+ error (_("value has been optimized out"));
+}
+
static void
require_not_optimized_out (const struct value *value)
{
- if (value->optimized_out)
- error (_("value has been optimized out"));
+ if (!VEC_empty (range_s, value->optimized_out))
+ {
+ if (value->lval == lval_register)
+ error (_("register has not been saved in frame"));
+ else
+ error_value_optimized_out ();
+ }
}
static void
return result;
}
-/* Copy LENGTH bytes of SRC value's contents starting at SRC_OFFSET,
- into DST value's contents, starting at DST_OFFSET. If unavailable
- contents are being copied from SRC, the corresponding DST contents
- are marked unavailable accordingly. Neither DST nor SRC may be
- lazy values. */
+/* Copy ranges in SRC_RANGE that overlap [SRC_BIT_OFFSET,
+ SRC_BIT_OFFSET+BIT_LENGTH) ranges into *DST_RANGE, adjusted. */
+
+static void
+ranges_copy_adjusted (VEC (range_s) **dst_range, int dst_bit_offset,
+ VEC (range_s) *src_range, int src_bit_offset,
+ int bit_length)
+{
+ range_s *r;
+ int i;
+
+ for (i = 0; VEC_iterate (range_s, src_range, i, r); i++)
+ {
+ ULONGEST h, l;
+
+ l = max (r->offset, src_bit_offset);
+ h = min (r->offset + r->length, src_bit_offset + bit_length);
+
+ if (l < h)
+ insert_into_bit_range_vector (dst_range,
+ dst_bit_offset + (l - src_bit_offset),
+ h - l);
+ }
+}
+
+/* Copy the ranges metadata in SRC that overlaps [SRC_BIT_OFFSET,
+ SRC_BIT_OFFSET+BIT_LENGTH) into DST, adjusted. */
+
+static void
+value_ranges_copy_adjusted (struct value *dst, int dst_bit_offset,
+ const struct value *src, int src_bit_offset,
+ int bit_length)
+{
+ ranges_copy_adjusted (&dst->unavailable, dst_bit_offset,
+ src->unavailable, src_bit_offset,
+ bit_length);
+ ranges_copy_adjusted (&dst->optimized_out, dst_bit_offset,
+ src->optimized_out, src_bit_offset,
+ bit_length);
+}
+
+/* Copy LENGTH bytes of SRC value's (all) contents
+ (value_contents_all) starting at SRC_OFFSET, into DST value's (all)
+ contents, starting at DST_OFFSET. If unavailable contents are
+ being copied from SRC, the corresponding DST contents are marked
+ unavailable accordingly. Neither DST nor SRC may be lazy
+ values.
+
+ It is assumed the contents of DST in the [DST_OFFSET,
+ DST_OFFSET+LENGTH) range are wholly available. */
void
value_contents_copy_raw (struct value *dst, int dst_offset,
{
range_s *r;
int i;
+ int src_bit_offset, dst_bit_offset, bit_length;
/* A lazy DST would make that this copy operation useless, since as
soon as DST's contents were un-lazied (by a later value_contents
mean we'd be copying garbage. */
gdb_assert (!dst->lazy && !src->lazy);
+ /* The overwritten DST range gets unavailability ORed in, not
+ replaced. Make sure to remember to implement replacing if it
+ turns out actually necessary. */
+ gdb_assert (value_bytes_available (dst, dst_offset, length));
+ gdb_assert (!value_bits_any_optimized_out (dst,
+ TARGET_CHAR_BIT * dst_offset,
+ TARGET_CHAR_BIT * length));
+
/* Copy the data. */
memcpy (value_contents_all_raw (dst) + dst_offset,
value_contents_all_raw (src) + src_offset,
length);
/* Copy the meta-data, adjusted. */
- for (i = 0; VEC_iterate (range_s, src->unavailable, i, r); i++)
- {
- ULONGEST h, l;
-
- l = max (r->offset, src_offset);
- h = min (r->offset + r->length, src_offset + length);
+ src_bit_offset = src_offset * TARGET_CHAR_BIT;
+ dst_bit_offset = dst_offset * TARGET_CHAR_BIT;
+ bit_length = length * TARGET_CHAR_BIT;
- if (l < h)
- mark_value_bytes_unavailable (dst,
- dst_offset + (l - src_offset),
- h - l);
- }
+ value_ranges_copy_adjusted (dst, dst_bit_offset,
+ src, src_bit_offset,
+ bit_length);
}
-/* Copy LENGTH bytes of SRC value's contents starting at SRC_OFFSET
- byte, into DST value's contents, starting at DST_OFFSET. If
- unavailable contents are being copied from SRC, the corresponding
- DST contents are marked unavailable accordingly. DST must not be
- lazy. If SRC is lazy, it will be fetched now. If SRC is not valid
- (is optimized out), an error is thrown. */
+/* Copy LENGTH bytes of SRC value's (all) contents
+ (value_contents_all) starting at SRC_OFFSET byte, into DST value's
+ (all) contents, starting at DST_OFFSET. If unavailable contents
+ are being copied from SRC, the corresponding DST contents are
+ marked unavailable accordingly. DST must not be lazy. If SRC is
+ lazy, it will be fetched now.
+
+ It is assumed the contents of DST in the [DST_OFFSET,
+ DST_OFFSET+LENGTH) range are wholly available. */
void
value_contents_copy (struct value *dst, int dst_offset,
struct value *src, int src_offset, int length)
{
- require_not_optimized_out (src);
-
if (src->lazy)
value_fetch_lazy (src);
return value_contents_raw (value);
}
-/* Return non-zero if VAL1 and VAL2 have the same contents. Note that
- this function is different from value_equal; in C the operator ==
- can return 0 even if the two values being compared are equal. */
-
int
-value_contents_equal (struct value *val1, struct value *val2)
+value_optimized_out (struct value *value)
{
- struct type *type1;
- struct type *type2;
- int len;
-
- type1 = check_typedef (value_type (val1));
- type2 = check_typedef (value_type (val2));
- len = TYPE_LENGTH (type1);
- if (len != TYPE_LENGTH (type2))
- return 0;
+ /* We can only know if a value is optimized out once we have tried to
+ fetch it. */
+ if (VEC_empty (range_s, value->optimized_out) && value->lazy)
+ value_fetch_lazy (value);
- return (memcmp (value_contents (val1), value_contents (val2), len) == 0);
+ return !VEC_empty (range_s, value->optimized_out);
}
-int
-value_optimized_out (struct value *value)
-{
- return value->optimized_out;
-}
+/* Mark contents of VALUE as optimized out, starting at OFFSET bytes, and
+ the following LENGTH bytes. */
void
-set_value_optimized_out (struct value *value, int val)
+mark_value_bytes_optimized_out (struct value *value, int offset, int length)
{
- value->optimized_out = val;
+ mark_value_bits_optimized_out (value,
+ offset * TARGET_CHAR_BIT,
+ length * TARGET_CHAR_BIT);
}
-int
-value_entirely_optimized_out (const struct value *value)
-{
- if (!value->optimized_out)
- return 0;
- if (value->lval != lval_computed
- || !value->location.computed.funcs->check_any_valid)
- return 1;
- return !value->location.computed.funcs->check_any_valid (value);
-}
+/* See value.h. */
-int
-value_bits_valid (const struct value *value, int offset, int length)
+void
+mark_value_bits_optimized_out (struct value *value, int offset, int length)
{
- if (!value->optimized_out)
- return 1;
- if (value->lval != lval_computed
- || !value->location.computed.funcs->check_validity)
- return 0;
- return value->location.computed.funcs->check_validity (value, offset,
- length);
+ insert_into_bit_range_vector (&value->optimized_out, offset, length);
}
int
value->pointed_to_offset = val;
}
-struct lval_funcs *
-value_computed_funcs (struct value *v)
+const struct lval_funcs *
+value_computed_funcs (const struct value *v)
{
- gdb_assert (VALUE_LVAL (v) == lval_computed);
+ gdb_assert (value_lval_const (v) == lval_computed);
return v->location.computed.funcs;
}
return &value->lval;
}
+enum lval_type
+value_lval_const (const struct value *value)
+{
+ return value->lval;
+}
+
CORE_ADDR
value_address (const struct value *value)
{
if (value->lval == lval_internalvar
- || value->lval == lval_internalvar_component)
+ || value->lval == lval_internalvar_component
+ || value->lval == lval_xcallable)
return 0;
- return value->location.address + value->offset;
+ if (value->parent != NULL)
+ return value_address (value->parent) + value->offset;
+ else
+ return value->location.address + value->offset;
}
CORE_ADDR
value_raw_address (struct value *value)
{
if (value->lval == lval_internalvar
- || value->lval == lval_internalvar_component)
+ || value->lval == lval_internalvar_component
+ || value->lval == lval_xcallable)
return 0;
return value->location.address;
}
set_value_address (struct value *value, CORE_ADDR addr)
{
gdb_assert (value->lval != lval_internalvar
- && value->lval != lval_internalvar_component);
+ && value->lval != lval_internalvar_component
+ && value->lval != lval_xcallable);
value->location.address = addr;
}
{
return value->modifiable;
}
-void
-deprecated_set_value_modifiable (struct value *value, int modifiable)
-{
- value->modifiable = modifiable;
-}
\f
/* Return a mark in the value chain. All values allocated after the
mark is obtained (except for those released) are subject to being freed
if (VALUE_LVAL (val) == lval_computed)
{
- struct lval_funcs *funcs = val->location.computed.funcs;
+ const struct lval_funcs *funcs = val->location.computed.funcs;
if (funcs->free_closure)
funcs->free_closure (val);
}
+ else if (VALUE_LVAL (val) == lval_xcallable)
+ free_xmethod_worker (val->location.xm_worker);
xfree (val->contents);
VEC_free (range_s, val->unavailable);
for (val = all_values; val && val != mark; val = next)
{
next = val->next;
+ val->released = 1;
value_free (val);
}
all_values = val;
for (val = all_values; val; val = next)
{
next = val->next;
+ val->released = 1;
value_free (val);
}
{
all_values = val->next;
val->next = NULL;
+ val->released = 1;
return;
}
{
v->next = val->next;
val->next = NULL;
+ val->released = 1;
break;
}
}
}
+/* If the value is not already released, release it.
+ If the value is already released, increment its reference count.
+ That is, this function ensures that the value is released from the
+ value chain and that the caller owns a reference to it. */
+
+void
+release_value_or_incref (struct value *val)
+{
+ if (val->released)
+ value_incref (val);
+ else
+ release_value (val);
+}
+
/* Release all values up to mark */
struct value *
value_release_to_mark (struct value *mark)
struct value *next;
for (val = next = all_values; next; next = next->next)
- if (next->next == mark)
- {
- all_values = next->next;
- next->next = NULL;
- return val;
- }
+ {
+ if (next->next == mark)
+ {
+ all_values = next->next;
+ next->next = NULL;
+ return val;
+ }
+ next->released = 1;
+ }
all_values = 0;
return val;
}
VALUE_FRAME_ID (val) = VALUE_FRAME_ID (arg);
VALUE_REGNUM (val) = VALUE_REGNUM (arg);
val->lazy = arg->lazy;
- val->optimized_out = arg->optimized_out;
val->embedded_offset = value_embedded_offset (arg);
val->pointed_to_offset = arg->pointed_to_offset;
val->modifiable = arg->modifiable;
}
val->unavailable = VEC_copy (range_s, arg->unavailable);
- val->parent = arg->parent;
- if (val->parent)
- value_incref (val->parent);
+ val->optimized_out = VEC_copy (range_s, arg->optimized_out);
+ set_value_parent (val, arg->parent);
if (VALUE_LVAL (val) == lval_computed)
{
- struct lval_funcs *funcs = val->location.computed.funcs;
+ const struct lval_funcs *funcs = val->location.computed.funcs;
if (funcs->copy_closure)
val->location.computed.closure = funcs->copy_closure (val);
set_value_component_location (struct value *component,
const struct value *whole)
{
+ gdb_assert (whole->lval != lval_xcallable);
+
if (whole->lval == lval_internalvar)
VALUE_LVAL (component) = lval_internalvar_component;
else
component->location = whole->location;
if (whole->lval == lval_computed)
{
- struct lval_funcs *funcs = whole->location.computed.funcs;
+ const struct lval_funcs *funcs = whole->location.computed.funcs;
if (funcs->copy_closure)
component->location.computed.closure = funcs->copy_closure (whole);
/* Access to the value history. */
/* Record a new value in the value history.
- Returns the absolute history index of the entry.
- Result of -1 indicates the value was not saved; otherwise it is the
- value history index of this new item. */
+ Returns the absolute history index of the entry. */
int
record_latest_value (struct value *val)
from. This is a bit dubious, because then *&$1 does not just return $1
but the current contents of that location. c'est la vie... */
val->modifiable = 0;
- release_value (val);
+
+ /* The value may have already been released, in which case we're adding a
+ new reference for its entry in the history. That is why we call
+ release_value_or_incref here instead of release_value. */
+ release_value_or_incref (val);
/* Here we treat value_history_count as origin-zero
and applying to the value being stored now. */
struct value *value;
/* The call-back routine used with INTERNALVAR_MAKE_VALUE. */
- internalvar_make_value make_value;
+ struct
+ {
+ /* The functions to call. */
+ const struct internalvar_funcs *functions;
+
+ /* The function's user-data. */
+ void *data;
+ } make_value;
/* The internal function used with INTERNALVAR_FUNCTION. */
struct
if (strcmp (var->name, name) == 0)
return var;
- return NULL;
-}
+ return NULL;
+}
+
+/* Complete NAME by comparing it to the names of internal variables.
+ Returns a vector of newly allocated strings, or NULL if no matches
+ were found. */
+
+VEC (char_ptr) *
+complete_internalvar (const char *name)
+{
+ VEC (char_ptr) *result = NULL;
+ struct internalvar *var;
+ int len;
+
+ len = strlen (name);
+
+ for (var = internalvars; var; var = var->next)
+ if (strncmp (var->name, name, len) == 0)
+ {
+ char *r = xstrdup (var->name);
+
+ VEC_safe_push (char_ptr, result, r);
+ }
+ return result;
+}
/* Create an internal variable with name NAME and with a void value.
NAME should not normally include a dollar sign. */
/* Create an internal variable with name NAME and register FUN as the
function that value_of_internalvar uses to create a value whenever
this variable is referenced. NAME should not normally include a
- dollar sign. */
+ dollar sign. DATA is passed uninterpreted to FUN when it is
+ called. CLEANUP, if not NULL, is called when the internal variable
+ is destroyed. It is passed DATA as its only argument. */
struct internalvar *
-create_internalvar_type_lazy (char *name, internalvar_make_value fun)
+create_internalvar_type_lazy (const char *name,
+ const struct internalvar_funcs *funcs,
+ void *data)
{
struct internalvar *var = create_internalvar (name);
var->kind = INTERNALVAR_MAKE_VALUE;
- var->u.make_value = fun;
+ var->u.make_value.functions = funcs;
+ var->u.make_value.data = data;
return var;
}
+/* See documentation in value.h. */
+
+int
+compile_internalvar_to_ax (struct internalvar *var,
+ struct agent_expr *expr,
+ struct axs_value *value)
+{
+ if (var->kind != INTERNALVAR_MAKE_VALUE
+ || var->u.make_value.functions->compile_to_ax == NULL)
+ return 0;
+
+ var->u.make_value.functions->compile_to_ax (var, expr, value,
+ var->u.make_value.data);
+ return 1;
+}
+
/* Look up an internal variable with name NAME. NAME should not
normally include a dollar sign.
break;
case INTERNALVAR_MAKE_VALUE:
- val = (*var->u.make_value) (gdbarch, var);
+ val = (*var->u.make_value.functions->make_value) (gdbarch, var,
+ var->u.make_value.data);
break;
default:
xfree (var->u.string);
break;
+ case INTERNALVAR_MAKE_VALUE:
+ if (var->u.make_value.functions->destroy != NULL)
+ var->u.make_value.functions->destroy (var->u.make_value.data);
+ break;
+
default:
break;
}
static void
function_destroyer (struct cmd_list_element *self, void *ignore)
{
- xfree (self->name);
- xfree (self->doc);
+ xfree ((char *) self->name);
+ xfree ((char *) self->doc);
}
/* Add a new internal function. NAME is the name of the function; DOC
for (var = internalvars; var; var = var->next)
preserve_one_internalvar (var, objfile, copied_types);
- preserve_python_values (objfile, copied_types);
+ preserve_ext_lang_values (objfile, copied_types);
htab_delete (copied_types);
}
get_user_print_options (&opts);
for (var = internalvars; var; var = var->next)
{
+ volatile struct gdb_exception ex;
+
if (!varseen)
{
varseen = 1;
}
printf_filtered (("$%s = "), var->name);
- value_print (value_of_internalvar (gdbarch, var), gdb_stdout,
- &opts);
+
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ struct value *val;
+
+ val = value_of_internalvar (gdbarch, var);
+ value_print (val, gdb_stdout, &opts);
+ }
+ if (ex.reason < 0)
+ fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message);
printf_filtered (("\n"));
}
if (!varseen)
- printf_unfiltered (_("No debugger convenience variables now defined.\n"
- "Convenience variables have "
- "names starting with \"$\";\n"
- "use \"set\" as in \"set "
- "$foo = 5\" to define them.\n"));
+ {
+ /* This text does not mention convenience functions on purpose.
+ The user can't create them except via Python, and if Python support
+ is installed this message will never be printed ($_streq will
+ exist). */
+ printf_unfiltered (_("No debugger convenience variables now defined.\n"
+ "Convenience variables have "
+ "names starting with \"$\";\n"
+ "use \"set\" as in \"set "
+ "$foo = 5\" to define them.\n"));
+ }
+}
+\f
+/* Return the TYPE_CODE_XMETHOD value corresponding to WORKER. */
+
+struct value *
+value_of_xmethod (struct xmethod_worker *worker)
+{
+ if (worker->value == NULL)
+ {
+ struct value *v;
+
+ v = allocate_value (builtin_type (target_gdbarch ())->xmethod);
+ v->lval = lval_xcallable;
+ v->location.xm_worker = worker;
+ v->modifiable = 0;
+ worker->value = v;
+ }
+
+ return worker->value;
+}
+
+/* Call the xmethod corresponding to the TYPE_CODE_XMETHOD value METHOD. */
+
+struct value *
+call_xmethod (struct value *method, int argc, struct value **argv)
+{
+ gdb_assert (TYPE_CODE (value_type (method)) == TYPE_CODE_XMETHOD
+ && method->lval == lval_xcallable && argc > 0);
+
+ return invoke_xmethod (method->location.xm_worker,
+ argv[0], argv + 1, argc - 1);
}
\f
/* Extract a value as a C number (either long or double).
\f
/* Get the value of the FIELDNO'th field (which must be static) of
- TYPE. Return NULL if the field doesn't exist or has been
- optimized out. */
+ TYPE. */
struct value *
value_static_field (struct type *type, int fieldno)
break;
case FIELD_LOC_KIND_PHYSNAME:
{
- char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
+ const char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
/* TYPE_FIELD_NAME (type, fieldno); */
struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0);
{
/* With some compilers, e.g. HP aCC, static data members are
reported as non-debuggable symbols. */
- struct minimal_symbol *msym = lookup_minimal_symbol (phys_name,
- NULL, NULL);
+ struct bound_minimal_symbol msym
+ = lookup_minimal_symbol (phys_name, NULL, NULL);
- if (!msym)
- return NULL;
+ if (!msym.minsym)
+ return allocate_optimized_out_value (type);
else
{
retval = value_at_lazy (TYPE_FIELD_TYPE (type, fieldno),
- SYMBOL_VALUE_ADDRESS (msym));
+ BMSYMBOL_VALUE_ADDRESS (msym));
}
}
else
description correctly. */
check_typedef (type);
- /* Handle packed fields */
-
if (TYPE_FIELD_BITSIZE (arg_type, fieldno))
{
- /* Create a new value for the bitfield, with bitpos and bitsize
+ /* Handle packed fields.
+
+ Create a new value for the bitfield, with bitpos and bitsize
set. If possible, arrange offset and bitpos so that we can
do a single aligned read of the size of the containing type.
Otherwise, adjust offset to the byte containing the first
bit. Assume that the address, offset, and embedded offset
are sufficiently aligned. */
+
int bitpos = TYPE_FIELD_BITPOS (arg_type, fieldno);
int container_bitsize = TYPE_LENGTH (type) * 8;
v->offset = (value_embedded_offset (arg1)
+ offset
+ (bitpos - v->bitpos) / 8);
- v->parent = arg1;
- value_incref (v->parent);
+ set_value_parent (v, arg1);
if (!value_lazy (arg1))
value_fetch_lazy (v);
}
/* This field is actually a base subobject, so preserve the
entire object's contents for later references to virtual
bases, etc. */
+ int boffset;
/* Lazy register values with offsets are not supported. */
if (VALUE_LVAL (arg1) == lval_register && value_lazy (arg1))
value_fetch_lazy (arg1);
+ /* We special case virtual inheritance here because this
+ requires access to the contents, which we would rather avoid
+ for references to ordinary fields of unavailable values. */
+ if (BASETYPE_VIA_VIRTUAL (arg_type, fieldno))
+ boffset = baseclass_offset (arg_type, fieldno,
+ value_contents (arg1),
+ value_embedded_offset (arg1),
+ value_address (arg1),
+ arg1);
+ else
+ boffset = TYPE_FIELD_BITPOS (arg_type, fieldno) / 8;
+
if (value_lazy (arg1))
v = allocate_value_lazy (value_enclosing_type (arg1));
else
}
v->type = type;
v->offset = value_offset (arg1);
- v->embedded_offset = (offset + value_embedded_offset (arg1)
- + TYPE_FIELD_BITPOS (arg_type, fieldno) / 8);
+ v->embedded_offset = offset + value_embedded_offset (arg1) + boffset;
}
else
{
{
struct value *v;
struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
- char *physname = TYPE_FN_FIELD_PHYSNAME (f, j);
+ const char *physname = TYPE_FN_FIELD_PHYSNAME (f, j);
struct symbol *sym;
- struct minimal_symbol *msym;
+ struct bound_minimal_symbol msym;
sym = lookup_symbol (physname, 0, VAR_DOMAIN, 0);
if (sym != NULL)
{
- msym = NULL;
+ memset (&msym, 0, sizeof (msym));
}
else
{
gdb_assert (sym == NULL);
- msym = lookup_minimal_symbol (physname, NULL, NULL);
- if (msym == NULL)
+ msym = lookup_bound_minimal_symbol (physname);
+ if (msym.minsym == NULL)
return NULL;
}
{
/* The minimal symbol might point to a function descriptor;
resolve it to the actual code address instead. */
- struct objfile *objfile = msymbol_objfile (msym);
+ struct objfile *objfile = msym.objfile;
struct gdbarch *gdbarch = get_objfile_arch (objfile);
set_value_address (v,
gdbarch_convert_from_func_ptr_addr
- (gdbarch, SYMBOL_VALUE_ADDRESS (msym), ¤t_target));
+ (gdbarch, BMSYMBOL_VALUE_ADDRESS (msym), ¤t_target));
}
if (arg1p)
\f
-/* Helper function for both unpack_value_bits_as_long and
- unpack_bits_as_long. See those functions for more details on the
- interface; the only difference is that this function accepts either
- a NULL or a non-NULL ORIGINAL_VALUE. */
+/* Unpack a bitfield of the specified FIELD_TYPE, from the object at
+ VALADDR, and store the result in *RESULT.
+ The bitfield starts at BITPOS bits and contains BITSIZE bits.
-static int
-unpack_value_bits_as_long_1 (struct type *field_type, const gdb_byte *valaddr,
- int embedded_offset, int bitpos, int bitsize,
- const struct value *original_value,
- LONGEST *result)
+ Extracting bits depends on endianness of the machine. Compute the
+ number of least significant bits to discard. For big endian machines,
+ we compute the total number of bits in the anonymous object, subtract
+ off the bit count from the MSB of the object to the MSB of the
+ bitfield, then the size of the bitfield, which leaves the LSB discard
+ count. For little endian machines, the discard count is simply the
+ number of bits from the LSB of the anonymous object to the LSB of the
+ bitfield.
+
+ If the field is signed, we also do sign extension. */
+
+static LONGEST
+unpack_bits_as_long (struct type *field_type, const gdb_byte *valaddr,
+ int bitpos, int bitsize)
{
enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (field_type));
ULONGEST val;
read_offset = bitpos / 8;
- if (original_value != NULL
- && !value_bytes_available (original_value, embedded_offset + read_offset,
- bytes_read))
- return 0;
-
- val = extract_unsigned_integer (valaddr + embedded_offset + read_offset,
+ val = extract_unsigned_integer (valaddr + read_offset,
bytes_read, byte_order);
/* Extract bits. See comment above. */
}
}
- *result = val;
- return 1;
-}
-
-/* Unpack a bitfield of the specified FIELD_TYPE, from the object at
- VALADDR + EMBEDDED_OFFSET, and store the result in *RESULT.
- VALADDR points to the contents of ORIGINAL_VALUE, which must not be
- NULL. The bitfield starts at BITPOS bits and contains BITSIZE
- bits.
-
- Returns false if the value contents are unavailable, otherwise
- returns true, indicating a valid value has been stored in *RESULT.
-
- Extracting bits depends on endianness of the machine. Compute the
- number of least significant bits to discard. For big endian machines,
- we compute the total number of bits in the anonymous object, subtract
- off the bit count from the MSB of the object to the MSB of the
- bitfield, then the size of the bitfield, which leaves the LSB discard
- count. For little endian machines, the discard count is simply the
- number of bits from the LSB of the anonymous object to the LSB of the
- bitfield.
-
- If the field is signed, we also do sign extension. */
-
-int
-unpack_value_bits_as_long (struct type *field_type, const gdb_byte *valaddr,
- int embedded_offset, int bitpos, int bitsize,
- const struct value *original_value,
- LONGEST *result)
-{
- gdb_assert (original_value != NULL);
-
- return unpack_value_bits_as_long_1 (field_type, valaddr, embedded_offset,
- bitpos, bitsize, original_value, result);
-
-}
-
-/* Unpack a field FIELDNO of the specified TYPE, from the object at
- VALADDR + EMBEDDED_OFFSET. VALADDR points to the contents of
- ORIGINAL_VALUE. See unpack_value_bits_as_long for more
- details. */
-
-static int
-unpack_value_field_as_long_1 (struct type *type, const gdb_byte *valaddr,
- int embedded_offset, int fieldno,
- const struct value *val, LONGEST *result)
-{
- int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
- int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
- struct type *field_type = TYPE_FIELD_TYPE (type, fieldno);
-
- return unpack_value_bits_as_long_1 (field_type, valaddr, embedded_offset,
- bitpos, bitsize, val,
- result);
+ return val;
}
/* Unpack a field FIELDNO of the specified TYPE, from the object at
int embedded_offset, int fieldno,
const struct value *val, LONGEST *result)
{
+ int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
+ int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
+ struct type *field_type = TYPE_FIELD_TYPE (type, fieldno);
+ int bit_offset;
+
gdb_assert (val != NULL);
- return unpack_value_field_as_long_1 (type, valaddr, embedded_offset,
- fieldno, val, result);
+ bit_offset = embedded_offset * TARGET_CHAR_BIT + bitpos;
+ if (value_bits_any_optimized_out (val, bit_offset, bitsize)
+ || !value_bits_available (val, bit_offset, bitsize))
+ return 0;
+
+ *result = unpack_bits_as_long (field_type, valaddr + embedded_offset,
+ bitpos, bitsize);
+ return 1;
}
/* Unpack a field FIELDNO of the specified TYPE, from the anonymous
- object at VALADDR. See unpack_value_bits_as_long for more details.
- This function differs from unpack_value_field_as_long in that it
- operates without a struct value object. */
+ object at VALADDR. See unpack_bits_as_long for more details. */
LONGEST
unpack_field_as_long (struct type *type, const gdb_byte *valaddr, int fieldno)
{
- LONGEST result;
+ int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
+ int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
+ struct type *field_type = TYPE_FIELD_TYPE (type, fieldno);
- unpack_value_field_as_long_1 (type, valaddr, 0, fieldno, NULL, &result);
- return result;
+ return unpack_bits_as_long (field_type, valaddr, bitpos, bitsize);
+}
+
+/* Unpack a bitfield of BITSIZE bits found at BITPOS in the object at
+ VALADDR + EMBEDDEDOFFSET that has the type of DEST_VAL and store
+ the contents in DEST_VAL, zero or sign extending if the type of
+ DEST_VAL is wider than BITSIZE. VALADDR points to the contents of
+ VAL. If the VAL's contents required to extract the bitfield from
+ are unavailable/optimized out, DEST_VAL is correspondingly
+ marked unavailable/optimized out. */
+
+void
+unpack_value_bitfield (struct value *dest_val,
+ int bitpos, int bitsize,
+ const gdb_byte *valaddr, int embedded_offset,
+ const struct value *val)
+{
+ enum bfd_endian byte_order;
+ int src_bit_offset;
+ int dst_bit_offset;
+ LONGEST num;
+ struct type *field_type = value_type (dest_val);
+
+ /* First, unpack and sign extend the bitfield as if it was wholly
+ available. Invalid/unavailable bits are read as zero, but that's
+ OK, as they'll end up marked below. */
+ byte_order = gdbarch_byte_order (get_type_arch (field_type));
+ num = unpack_bits_as_long (field_type, valaddr + embedded_offset,
+ bitpos, bitsize);
+ store_signed_integer (value_contents_raw (dest_val),
+ TYPE_LENGTH (field_type), byte_order, num);
+
+ /* Now copy the optimized out / unavailability ranges to the right
+ bits. */
+ src_bit_offset = embedded_offset * TARGET_CHAR_BIT + bitpos;
+ if (byte_order == BFD_ENDIAN_BIG)
+ dst_bit_offset = TYPE_LENGTH (field_type) * TARGET_CHAR_BIT - bitsize;
+ else
+ dst_bit_offset = 0;
+ value_ranges_copy_adjusted (dest_val, dst_bit_offset,
+ val, src_bit_offset, bitsize);
}
/* Return a new value with type TYPE, which is FIELDNO field of the
object at VALADDR + EMBEDDEDOFFSET. VALADDR points to the contents
of VAL. If the VAL's contents required to extract the bitfield
- from are unavailable, the new value is correspondingly marked as
- unavailable. */
+ from are unavailable/optimized out, the new value is
+ correspondingly marked unavailable/optimized out. */
struct value *
value_field_bitfield (struct type *type, int fieldno,
const gdb_byte *valaddr,
int embedded_offset, const struct value *val)
{
- LONGEST l;
+ int bitpos = TYPE_FIELD_BITPOS (type, fieldno);
+ int bitsize = TYPE_FIELD_BITSIZE (type, fieldno);
+ struct value *res_val = allocate_value (TYPE_FIELD_TYPE (type, fieldno));
- if (!unpack_value_field_as_long (type, valaddr, embedded_offset, fieldno,
- val, &l))
- {
- struct type *field_type = TYPE_FIELD_TYPE (type, fieldno);
- struct value *retval = allocate_value (field_type);
- mark_value_bytes_unavailable (retval, 0, TYPE_LENGTH (field_type));
- return retval;
- }
- else
- {
- return value_from_longest (TYPE_FIELD_TYPE (type, fieldno), l);
- }
+ unpack_value_bitfield (res_val, bitpos, bitsize,
+ valaddr, embedded_offset, val);
+
+ return res_val;
}
/* Modify the value of a bitfield. ADDR points to a block of memory in
/* Pack NUM into BUF using a target format of TYPE. */
-void
+static void
pack_unsigned_long (gdb_byte *buf, struct type *type, ULONGEST num)
{
int len;
/* Create a value representing a pointer of type TYPE to the address
ADDR. */
+
struct value *
value_from_pointer (struct type *type, CORE_ADDR addr)
{
struct value *val = allocate_value (type);
- store_typed_address (value_contents_raw (val), check_typedef (type), addr);
+ store_typed_address (value_contents_raw (val),
+ check_typedef (type), addr);
return val;
}
/* Create a value of type TYPE whose contents come from VALADDR, if it
is non-null, and whose memory address (in the inferior) is
- ADDRESS. */
+ ADDRESS. The type of the created value may differ from the passed
+ type TYPE. Make sure to retrieve values new type after this call.
+ Note that TYPE is not passed through resolve_dynamic_type; this is
+ a special API intended for use only by Ada. */
+
+struct value *
+value_from_contents_and_address_unresolved (struct type *type,
+ const gdb_byte *valaddr,
+ CORE_ADDR address)
+{
+ struct value *v;
+
+ if (valaddr == NULL)
+ v = allocate_value_lazy (type);
+ else
+ v = value_from_contents (type, valaddr);
+ set_value_address (v, address);
+ VALUE_LVAL (v) = lval_memory;
+ return v;
+}
+
+/* Create a value of type TYPE whose contents come from VALADDR, if it
+ is non-null, and whose memory address (in the inferior) is
+ ADDRESS. The type of the created value may differ from the passed
+ type TYPE. Make sure to retrieve values new type after this call. */
struct value *
value_from_contents_and_address (struct type *type,
const gdb_byte *valaddr,
CORE_ADDR address)
{
+ struct type *resolved_type = resolve_dynamic_type (type, address);
+ struct type *resolved_type_no_typedef = check_typedef (resolved_type);
struct value *v;
if (valaddr == NULL)
- v = allocate_value_lazy (type);
+ v = allocate_value_lazy (resolved_type);
else
- {
- v = allocate_value (type);
- memcpy (value_contents_raw (v), valaddr, TYPE_LENGTH (type));
- }
+ v = value_from_contents (resolved_type, valaddr);
+ if (TYPE_DATA_LOCATION (resolved_type_no_typedef) != NULL
+ && TYPE_DATA_LOCATION_KIND (resolved_type_no_typedef) == PROP_CONST)
+ address = TYPE_DATA_LOCATION_ADDR (resolved_type_no_typedef);
set_value_address (v, address);
VALUE_LVAL (v) = lval_memory;
return v;
}
+/* Create a value of type TYPE holding the contents CONTENTS.
+ The new value is `not_lval'. */
+
+struct value *
+value_from_contents (struct type *type, const gdb_byte *contents)
+{
+ struct value *result;
+
+ result = allocate_value (type);
+ memcpy (value_contents_raw (result), contents, TYPE_LENGTH (type));
+ return result;
+}
+
struct value *
value_from_double (struct type *type, DOUBLEST num)
{
return val;
}
+/* Extract a value from the history file. Input will be of the form
+ $digits or $$digits. See block comment above 'write_dollar_variable'
+ for details. */
+
+struct value *
+value_from_history_ref (const char *h, const char **endp)
+{
+ int index, len;
+
+ if (h[0] == '$')
+ len = 1;
+ else
+ return NULL;
+
+ if (h[1] == '$')
+ len = 2;
+
+ /* Find length of numeral string. */
+ for (; isdigit (h[len]); len++)
+ ;
+
+ /* Make sure numeral string is not part of an identifier. */
+ if (h[len] == '_' || isalpha (h[len]))
+ return NULL;
+
+ /* Now collect the index value. */
+ if (h[1] == '$')
+ {
+ if (len == 2)
+ {
+ /* For some bizarre reason, "$$" is equivalent to "$$1",
+ rather than to "$$0" as it ought to be! */
+ index = -1;
+ *endp += len;
+ }
+ else
+ {
+ char *local_end;
+
+ index = -strtol (&h[2], &local_end, 10);
+ *endp = local_end;
+ }
+ }
+ else
+ {
+ if (len == 1)
+ {
+ /* "$" is equivalent to "$0". */
+ index = 0;
+ *endp += len;
+ }
+ else
+ {
+ char *local_end;
+
+ index = strtol (&h[1], &local_end, 10);
+ *endp = local_end;
+ }
+ }
+
+ return access_value_history (index);
+}
+
+struct value *
+coerce_ref_if_computed (const struct value *arg)
+{
+ const struct lval_funcs *funcs;
+
+ if (TYPE_CODE (check_typedef (value_type (arg))) != TYPE_CODE_REF)
+ return NULL;
+
+ if (value_lval_const (arg) != lval_computed)
+ return NULL;
+
+ funcs = value_computed_funcs (arg);
+ if (funcs->coerce_ref == NULL)
+ return NULL;
+
+ return funcs->coerce_ref (arg);
+}
+
+/* Look at value.h for description. */
+
+struct value *
+readjust_indirect_value_type (struct value *value, struct type *enc_type,
+ struct type *original_type,
+ struct value *original_value)
+{
+ /* Re-adjust type. */
+ deprecated_set_value_type (value, TYPE_TARGET_TYPE (original_type));
+
+ /* Add embedding info. */
+ set_value_enclosing_type (value, enc_type);
+ set_value_embedded_offset (value, value_pointed_to_offset (original_value));
+
+ /* We may be pointing to an object of some derived type. */
+ return value_full_object (value, NULL, 0, 0, 0);
+}
+
struct value *
coerce_ref (struct value *arg)
{
struct type *value_type_arg_tmp = check_typedef (value_type (arg));
+ struct value *retval;
+ struct type *enc_type;
- if (TYPE_CODE (value_type_arg_tmp) == TYPE_CODE_REF)
- arg = value_at_lazy (TYPE_TARGET_TYPE (value_type_arg_tmp),
- unpack_pointer (value_type (arg),
- value_contents (arg)));
- return arg;
+ retval = coerce_ref_if_computed (arg);
+ if (retval)
+ return retval;
+
+ if (TYPE_CODE (value_type_arg_tmp) != TYPE_CODE_REF)
+ return arg;
+
+ enc_type = check_typedef (value_enclosing_type (arg));
+ enc_type = TYPE_TARGET_TYPE (enc_type);
+
+ retval = value_at_lazy (enc_type,
+ unpack_pointer (value_type (arg),
+ value_contents (arg)));
+ enc_type = value_type (retval);
+ return readjust_indirect_value_type (retval, enc_type,
+ value_type_arg_tmp, arg);
}
struct value *
}
\f
-/* Return true if the function returning the specified type is using
- the convention of returning structures in memory (passing in the
- address as a hidden first parameter). */
+/* Return the return value convention that will be used for the
+ specified type. */
-int
-using_struct_return (struct gdbarch *gdbarch,
- struct type *func_type, struct type *value_type)
+enum return_value_convention
+struct_return_convention (struct gdbarch *gdbarch,
+ struct value *function, struct type *value_type)
{
enum type_code code = TYPE_CODE (value_type);
if (code == TYPE_CODE_ERROR)
error (_("Function return type unknown."));
- if (code == TYPE_CODE_VOID)
+ /* Probe the architecture for the return-value convention. */
+ return gdbarch_return_value (gdbarch, function, value_type,
+ NULL, NULL, NULL);
+}
+
+/* Return true if the function returning the specified type is using
+ the convention of returning structures in memory (passing in the
+ address as a hidden first parameter). */
+
+int
+using_struct_return (struct gdbarch *gdbarch,
+ struct value *function, struct type *value_type)
+{
+ if (TYPE_CODE (value_type) == TYPE_CODE_VOID)
/* A void return value is never in memory. See also corresponding
code in "print_return_value". */
return 0;
- /* Probe the architecture for the return-value convention. */
- return (gdbarch_return_value (gdbarch, func_type, value_type,
- NULL, NULL, NULL)
+ return (struct_return_convention (gdbarch, function, value_type)
!= RETURN_VALUE_REGISTER_CONVENTION);
}
return val->initialized;
}
+/* Called only from the value_contents and value_contents_all()
+ macros, if the current data for a variable needs to be loaded into
+ value_contents(VAL). Fetches the data from the user's process, and
+ clears the lazy flag to indicate that the data in the buffer is
+ valid.
+
+ If the value is zero-length, we avoid calling read_memory, which
+ would abort. We mark the value as fetched anyway -- all 0 bytes of
+ it.
+
+ This function returns a value because it is used in the
+ value_contents macro as part of an expression, where a void would
+ not work. The value is ignored. */
+
+int
+value_fetch_lazy (struct value *val)
+{
+ gdb_assert (value_lazy (val));
+ allocate_value_contents (val);
+ /* A value is either lazy, or fully fetched. The
+ availability/validity is only established as we try to fetch a
+ value. */
+ gdb_assert (VEC_empty (range_s, val->optimized_out));
+ gdb_assert (VEC_empty (range_s, val->unavailable));
+ if (value_bitsize (val))
+ {
+ /* To read a lazy bitfield, read the entire enclosing value. This
+ prevents reading the same block of (possibly volatile) memory once
+ per bitfield. It would be even better to read only the containing
+ word, but we have no way to record that just specific bits of a
+ value have been fetched. */
+ struct type *type = check_typedef (value_type (val));
+ struct value *parent = value_parent (val);
+
+ if (value_lazy (parent))
+ value_fetch_lazy (parent);
+
+ unpack_value_bitfield (val,
+ value_bitpos (val), value_bitsize (val),
+ value_contents_for_printing (parent),
+ value_offset (val), parent);
+ }
+ else if (VALUE_LVAL (val) == lval_memory)
+ {
+ CORE_ADDR addr = value_address (val);
+ struct type *type = check_typedef (value_enclosing_type (val));
+
+ if (TYPE_LENGTH (type))
+ read_value_memory (val, 0, value_stack (val),
+ addr, value_contents_all_raw (val),
+ TYPE_LENGTH (type));
+ }
+ else if (VALUE_LVAL (val) == lval_register)
+ {
+ struct frame_info *frame;
+ int regnum;
+ struct type *type = check_typedef (value_type (val));
+ struct value *new_val = val, *mark = value_mark ();
+
+ /* Offsets are not supported here; lazy register values must
+ refer to the entire register. */
+ gdb_assert (value_offset (val) == 0);
+
+ while (VALUE_LVAL (new_val) == lval_register && value_lazy (new_val))
+ {
+ struct frame_id frame_id = VALUE_FRAME_ID (new_val);
+
+ frame = frame_find_by_id (frame_id);
+ regnum = VALUE_REGNUM (new_val);
+
+ gdb_assert (frame != NULL);
+
+ /* Convertible register routines are used for multi-register
+ values and for interpretation in different types
+ (e.g. float or int from a double register). Lazy
+ register values should have the register's natural type,
+ so they do not apply. */
+ gdb_assert (!gdbarch_convert_register_p (get_frame_arch (frame),
+ regnum, type));
+
+ new_val = get_frame_register_value (frame, regnum);
+
+ /* If we get another lazy lval_register value, it means the
+ register is found by reading it from the next frame.
+ get_frame_register_value should never return a value with
+ the frame id pointing to FRAME. If it does, it means we
+ either have two consecutive frames with the same frame id
+ in the frame chain, or some code is trying to unwind
+ behind get_prev_frame's back (e.g., a frame unwind
+ sniffer trying to unwind), bypassing its validations. In
+ any case, it should always be an internal error to end up
+ in this situation. */
+ if (VALUE_LVAL (new_val) == lval_register
+ && value_lazy (new_val)
+ && frame_id_eq (VALUE_FRAME_ID (new_val), frame_id))
+ internal_error (__FILE__, __LINE__,
+ _("infinite loop while fetching a register"));
+ }
+
+ /* If it's still lazy (for instance, a saved register on the
+ stack), fetch it. */
+ if (value_lazy (new_val))
+ value_fetch_lazy (new_val);
+
+ /* Copy the contents and the unavailability/optimized-out
+ meta-data from NEW_VAL to VAL. */
+ set_value_lazy (val, 0);
+ value_contents_copy (val, value_embedded_offset (val),
+ new_val, value_embedded_offset (new_val),
+ TYPE_LENGTH (type));
+
+ if (frame_debug)
+ {
+ struct gdbarch *gdbarch;
+ frame = frame_find_by_id (VALUE_FRAME_ID (val));
+ regnum = VALUE_REGNUM (val);
+ gdbarch = get_frame_arch (frame);
+
+ fprintf_unfiltered (gdb_stdlog,
+ "{ value_fetch_lazy "
+ "(frame=%d,regnum=%d(%s),...) ",
+ frame_relative_level (frame), regnum,
+ user_reg_map_regnum_to_name (gdbarch, regnum));
+
+ fprintf_unfiltered (gdb_stdlog, "->");
+ if (value_optimized_out (new_val))
+ {
+ fprintf_unfiltered (gdb_stdlog, " ");
+ val_print_optimized_out (new_val, gdb_stdlog);
+ }
+ else
+ {
+ int i;
+ const gdb_byte *buf = value_contents (new_val);
+
+ if (VALUE_LVAL (new_val) == lval_register)
+ fprintf_unfiltered (gdb_stdlog, " register=%d",
+ VALUE_REGNUM (new_val));
+ else if (VALUE_LVAL (new_val) == lval_memory)
+ fprintf_unfiltered (gdb_stdlog, " address=%s",
+ paddress (gdbarch,
+ value_address (new_val)));
+ else
+ fprintf_unfiltered (gdb_stdlog, " computed");
+
+ fprintf_unfiltered (gdb_stdlog, " bytes=");
+ fprintf_unfiltered (gdb_stdlog, "[");
+ for (i = 0; i < register_size (gdbarch, regnum); i++)
+ fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
+ fprintf_unfiltered (gdb_stdlog, "]");
+ }
+
+ fprintf_unfiltered (gdb_stdlog, " }\n");
+ }
+
+ /* Dispose of the intermediate values. This prevents
+ watchpoints from trying to watch the saved frame pointer. */
+ value_free_to_mark (mark);
+ }
+ else if (VALUE_LVAL (val) == lval_computed
+ && value_computed_funcs (val)->read != NULL)
+ value_computed_funcs (val)->read (val);
+ else
+ internal_error (__FILE__, __LINE__, _("Unexpected lazy value type."));
+
+ set_value_lazy (val, 0);
+ return 0;
+}
+
+/* Implementation of the convenience function $_isvoid. */
+
+static struct value *
+isvoid_internal_fn (struct gdbarch *gdbarch,
+ const struct language_defn *language,
+ void *cookie, int argc, struct value **argv)
+{
+ int ret;
+
+ if (argc != 1)
+ error (_("You must provide one argument for $_isvoid."));
+
+ ret = TYPE_CODE (value_type (argv[0])) == TYPE_CODE_VOID;
+
+ return value_from_longest (builtin_type (gdbarch)->builtin_int, ret);
+}
+
void
_initialize_values (void)
{
add_cmd ("convenience", no_class, show_convenience, _("\
-Debugger convenience (\"$foo\") variables.\n\
-These variables are created when you assign them values;\n\
-thus, \"print $foo=1\" gives \"$foo\" the value 1. Values may be any type.\n\
+Debugger convenience (\"$foo\") variables and functions.\n\
+Convenience variables are created when you assign them values;\n\
+thus, \"set $foo=1\" gives \"$foo\" the value 1. Values may be any type.\n\
\n\
A few convenience variables are given values automatically:\n\
\"$_\"holds the last address examined with \"x\" or \"info lines\",\n\
-\"$__\" holds the contents of the last address examined with \"x\"."),
- &showlist);
+\"$__\" holds the contents of the last address examined with \"x\"."
+#ifdef HAVE_PYTHON
+"\n\n\
+Convenience functions are defined via the Python API."
+#endif
+ ), &showlist);
+ add_alias_cmd ("conv", "convenience", no_class, 1, &showlist);
- add_cmd ("values", no_class, show_values, _("\
+ add_cmd ("values", no_set_class, show_values, _("\
Elements of value history around item number IDX (or last ten)."),
&showlist);
add_prefix_cmd ("function", no_class, function_command, _("\
Placeholder command for showing help on convenience functions."),
&functionlist, "function ", 0, &cmdlist);
+
+ add_internal_function ("_isvoid", _("\
+Check whether an expression is void.\n\
+Usage: $_isvoid (expression)\n\
+Return 1 if the expression is void, zero otherwise."),
+ isvoid_internal_fn, NULL);
}
projects / platform / upstream / binutils.git / blobdiff