X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Ffindvar.c;h=d0051455109a5dc203d08888e138745fe862a44c;hb=fbd5db48c538738520ee7b9a0699499b56bc9411;hp=58da6b6a3fbdcb366908e6289108a2f8032bada6;hpb=36b9d39cf464e3511c08399cbce1da7e098fde69;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/findvar.c b/gdb/findvar.c
index 58da6b6a3f..d005145510 100644
--- a/gdb/findvar.c
+++ b/gdb/findvar.c
@@ -1,700 +1,794 @@
/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
-This file is part of GDB.
+ Copyright (C) 1986-2001, 2003-2005, 2007-2012 Free Software
+ Foundation, Inc.
-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 2 of the License, or
-(at your option) any later version.
+ This file is part of GDB.
-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.
+ 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.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 . */
-#include
#include "defs.h"
-#include "param.h"
#include "symtab.h"
+#include "gdbtypes.h"
#include "frame.h"
#include "value.h"
#include "gdbcore.h"
#include "inferior.h"
#include "target.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "floatformat.h"
+#include "symfile.h" /* for overlay functions */
+#include "regcache.h"
+#include "user-regs.h"
+#include "block.h"
+#include "objfiles.h"
+#include "language.h"
+
+/* Basic byte-swapping routines. All 'extract' functions return a
+ host-format integer from a target-format integer at ADDR which is
+ LEN bytes long. */
+
+#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
+ /* 8 bit characters are a pretty safe assumption these days, so we
+ assume it throughout all these swapping routines. If we had to deal with
+ 9 bit characters, we would need to make len be in bits and would have
+ to re-write these routines... */
+you lose
+#endif
-#if !defined (GET_SAVED_REGISTER)
+LONGEST
+extract_signed_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
+{
+ LONGEST retval;
+ const unsigned char *p;
+ const unsigned char *startaddr = addr;
+ const unsigned char *endaddr = startaddr + len;
+
+ if (len > (int) sizeof (LONGEST))
+ error (_("\
+That operation is not available on integers of more than %d bytes."),
+ (int) sizeof (LONGEST));
+
+ /* Start at the most significant end of the integer, and work towards
+ the least significant. */
+ if (byte_order == BFD_ENDIAN_BIG)
+ {
+ p = startaddr;
+ /* Do the sign extension once at the start. */
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
+ for (++p; p < endaddr; ++p)
+ retval = (retval << 8) | *p;
+ }
+ else
+ {
+ p = endaddr - 1;
+ /* Do the sign extension once at the start. */
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
+ for (--p; p >= startaddr; --p)
+ retval = (retval << 8) | *p;
+ }
+ return retval;
+}
-/* Return the address in which frame FRAME's value of register REGNUM
- has been saved in memory. Or return zero if it has not been saved.
- If REGNUM specifies the SP, the value we return is actually
- the SP value, not an address where it was saved. */
+ULONGEST
+extract_unsigned_integer (const gdb_byte *addr, int len,
+ enum bfd_endian byte_order)
+{
+ ULONGEST retval;
+ const unsigned char *p;
+ const unsigned char *startaddr = addr;
+ const unsigned char *endaddr = startaddr + len;
+
+ if (len > (int) sizeof (ULONGEST))
+ error (_("\
+That operation is not available on integers of more than %d bytes."),
+ (int) sizeof (ULONGEST));
+
+ /* Start at the most significant end of the integer, and work towards
+ the least significant. */
+ retval = 0;
+ if (byte_order == BFD_ENDIAN_BIG)
+ {
+ for (p = startaddr; p < endaddr; ++p)
+ retval = (retval << 8) | *p;
+ }
+ else
+ {
+ for (p = endaddr - 1; p >= startaddr; --p)
+ retval = (retval << 8) | *p;
+ }
+ return retval;
+}
-CORE_ADDR
-find_saved_register (frame, regnum)
- FRAME frame;
- int regnum;
+/* Sometimes a long long unsigned integer can be extracted as a
+ LONGEST value. This is done so that we can print these values
+ better. If this integer can be converted to a LONGEST, this
+ function returns 1 and sets *PVAL. Otherwise it returns 0. */
+
+int
+extract_long_unsigned_integer (const gdb_byte *addr, int orig_len,
+ enum bfd_endian byte_order, LONGEST *pval)
{
- struct frame_info *fi;
- struct frame_saved_regs saved_regs;
-
- register FRAME frame1 = 0;
- register CORE_ADDR addr = 0;
-
- if (frame == 0) /* No regs saved if want current frame */
- return 0;
-
-#ifdef HAVE_REGISTER_WINDOWS
- /* We assume that a register in a register window will only be saved
- in one place (since the name changes and/or disappears as you go
- towards inner frames), so we only call get_frame_saved_regs on
- the current frame. This is directly in contradiction to the
- usage below, which assumes that registers used in a frame must be
- saved in a lower (more interior) frame. This change is a result
- of working on a register window machine; get_frame_saved_regs
- always returns the registers saved within a frame, within the
- context (register namespace) of that frame. */
-
- /* However, note that we don't want this to return anything if
- nothing is saved (if there's a frame inside of this one). Also,
- callers to this routine asking for the stack pointer want the
- stack pointer saved for *this* frame; this is returned from the
- next frame. */
-
-
- if (REGISTER_IN_WINDOW_P(regnum))
+ const gdb_byte *p;
+ const gdb_byte *first_addr;
+ int len;
+
+ len = orig_len;
+ if (byte_order == BFD_ENDIAN_BIG)
{
- frame1 = get_next_frame (frame);
- if (!frame1) return 0; /* Registers of this frame are
- active. */
-
- /* Get the SP from the next frame in; it will be this
- current frame. */
- if (regnum != SP_REGNUM)
- frame1 = frame;
-
- fi = get_frame_info (frame1);
- get_frame_saved_regs (fi, &saved_regs);
- return saved_regs.regs[regnum]; /* ... which might be zero */
+ for (p = addr;
+ len > (int) sizeof (LONGEST) && p < addr + orig_len;
+ p++)
+ {
+ if (*p == 0)
+ len--;
+ else
+ break;
+ }
+ first_addr = p;
+ }
+ else
+ {
+ first_addr = addr;
+ for (p = addr + orig_len - 1;
+ len > (int) sizeof (LONGEST) && p >= addr;
+ p--)
+ {
+ if (*p == 0)
+ len--;
+ else
+ break;
+ }
}
-#endif /* HAVE_REGISTER_WINDOWS */
- /* Note that this next routine assumes that registers used in
- frame x will be saved only in the frame that x calls and
- frames interior to it. This is not true on the sparc, but the
- above macro takes care of it, so we should be all right. */
- while (1)
+ if (len <= (int) sizeof (LONGEST))
{
- QUIT;
- frame1 = get_prev_frame (frame1);
- if (frame1 == 0 || frame1 == frame)
- break;
- fi = get_frame_info (frame1);
- get_frame_saved_regs (fi, &saved_regs);
- if (saved_regs.regs[regnum])
- addr = saved_regs.regs[regnum];
+ *pval = (LONGEST) extract_unsigned_integer (first_addr,
+ sizeof (LONGEST),
+ byte_order);
+ return 1;
}
- return addr;
+ return 0;
}
-/* Find register number REGNUM relative to FRAME and put its
- (raw) contents in *RAW_BUFFER. Set *OPTIMIZED if the variable
- was optimized out (and thus can't be fetched). Set *LVAL to
- lval_memory, lval_register, or not_lval, depending on whether the
- value was fetched from memory, from a register, or in a strange
- and non-modifiable way (e.g. a frame pointer which was calculated
- rather than fetched). Set *ADDRP to the address, either in memory
- on as a REGISTER_BYTE offset into the registers array.
- Note that this implementation never sets *LVAL to not_lval. But
- it can be replaced by defining GET_SAVED_REGISTER and supplying
- your own.
+/* Treat the bytes at BUF as a pointer of type TYPE, and return the
+ address it represents. */
+CORE_ADDR
+extract_typed_address (const gdb_byte *buf, struct type *type)
+{
+ if (TYPE_CODE (type) != TYPE_CODE_PTR
+ && TYPE_CODE (type) != TYPE_CODE_REF)
+ internal_error (__FILE__, __LINE__,
+ _("extract_typed_address: "
+ "type is not a pointer or reference"));
+
+ return gdbarch_pointer_to_address (get_type_arch (type), type, buf);
+}
+
+/* All 'store' functions accept a host-format integer and store a
+ target-format integer at ADDR which is LEN bytes long. */
- The argument RAW_BUFFER must point to aligned memory. */
void
-get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
- char *raw_buffer;
- int *optimized;
- CORE_ADDR *addrp;
- FRAME frame;
- int regnum;
- enum lval_type *lval;
+store_signed_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, LONGEST val)
{
- CORE_ADDR addr;
- /* Normal systems don't optimize out things with register numbers. */
- if (optimized != NULL)
- *optimized = 0;
- addr = find_saved_register (frame, regnum);
- if (addr != NULL)
+ gdb_byte *p;
+ gdb_byte *startaddr = addr;
+ gdb_byte *endaddr = startaddr + len;
+
+ /* Start at the least significant end of the integer, and work towards
+ the most significant. */
+ if (byte_order == BFD_ENDIAN_BIG)
{
- if (lval != NULL)
- *lval = lval_memory;
- if (regnum == SP_REGNUM)
+ for (p = endaddr - 1; p >= startaddr; --p)
{
- if (raw_buffer != NULL)
- *(CORE_ADDR *)raw_buffer = addr;
- if (addrp != NULL)
- *addrp = 0;
- return;
+ *p = val & 0xff;
+ val >>= 8;
}
- if (raw_buffer != NULL)
- read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
}
else
{
- if (lval != NULL)
- *lval = lval_register;
- addr = REGISTER_BYTE (regnum);
- if (raw_buffer != NULL)
- read_register_gen (regnum, raw_buffer);
+ for (p = startaddr; p < endaddr; ++p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
}
- if (addrp != NULL)
- *addrp = addr;
}
-#endif /* GET_SAVED_REGISTER. */
-
-/* Copy the bytes of register REGNUM, relative to the current stack frame,
- into our memory at MYADDR, in target byte order.
- The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
- Returns 1 if could not be read, 0 if could. */
-
-int
-read_relative_register_raw_bytes (regnum, myaddr)
- int regnum;
- char *myaddr;
+void
+store_unsigned_integer (gdb_byte *addr, int len,
+ enum bfd_endian byte_order, ULONGEST val)
{
- int optim;
- if (regnum == FP_REGNUM && selected_frame)
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *) addr;
+ unsigned char *endaddr = startaddr + len;
+
+ /* Start at the least significant end of the integer, and work towards
+ the most significant. */
+ if (byte_order == BFD_ENDIAN_BIG)
{
- bcopy (&FRAME_FP(selected_frame), myaddr, sizeof (CORE_ADDR));
- SWAP_TARGET_AND_HOST (myaddr, sizeof (CORE_ADDR)); /* in target order */
- return 0;
+ for (p = endaddr - 1; p >= startaddr; --p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+ }
+ else
+ {
+ for (p = startaddr; p < endaddr; ++p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
}
+}
- get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
- regnum, (enum lval_type *)NULL);
- return optim;
+/* Store the address ADDR as a pointer of type TYPE at BUF, in target
+ form. */
+void
+store_typed_address (gdb_byte *buf, struct type *type, CORE_ADDR addr)
+{
+ if (TYPE_CODE (type) != TYPE_CODE_PTR
+ && TYPE_CODE (type) != TYPE_CODE_REF)
+ internal_error (__FILE__, __LINE__,
+ _("store_typed_address: "
+ "type is not a pointer or reference"));
+
+ gdbarch_address_to_pointer (get_type_arch (type), type, buf, addr);
}
-/* Return a `value' with the contents of register REGNUM
- in its virtual format, with the type specified by
- REGISTER_VIRTUAL_TYPE. */
-value
-value_of_register (regnum)
- int regnum;
+
+/* Return a `value' with the contents of (virtual or cooked) register
+ REGNUM as found in the specified FRAME. The register's type is
+ determined by register_type(). */
+
+struct value *
+value_of_register (int regnum, struct frame_info *frame)
{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
CORE_ADDR addr;
int optim;
- register value val;
- char raw_buffer[MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+ int unavail;
+ struct value *reg_val;
+ int realnum;
+ gdb_byte raw_buffer[MAX_REGISTER_SIZE];
enum lval_type lval;
- get_saved_register (raw_buffer, &optim, &addr,
- selected_frame, regnum, &lval);
-
- target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
- val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (val),
- REGISTER_VIRTUAL_SIZE (regnum));
- VALUE_LVAL (val) = lval;
- VALUE_ADDRESS (val) = addr;
- VALUE_REGNO (val) = regnum;
- VALUE_OPTIMIZED_OUT (val) = optim;
- return val;
-}
-
-/* Low level examining and depositing of registers.
+ /* User registers lie completely outside of the range of normal
+ registers. Catch them early so that the target never sees them. */
+ if (regnum >= gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch))
+ return value_of_user_reg (regnum, frame);
- The caller is responsible for making
- sure that the inferior is stopped before calling the fetching routines,
- or it will get garbage. (a change from GDB version 3, in which
- the caller got the value from the last stop). */
+ frame_register (frame, regnum, &optim, &unavail,
+ &lval, &addr, &realnum, raw_buffer);
-/* Contents of the registers in target byte order.
- We allocate some extra slop since we do a lot of bcopy's around `registers',
- and failing-soft is better than failing hard. */
-char registers[REGISTER_BYTES + /* SLOP */ 256];
+ reg_val = allocate_value (register_type (gdbarch, regnum));
-/* Nonzero if that register has been fetched. */
-char register_valid[NUM_REGS];
+ if (!optim && !unavail)
+ memcpy (value_contents_raw (reg_val), raw_buffer,
+ register_size (gdbarch, regnum));
+ else
+ memset (value_contents_raw (reg_val), 0,
+ register_size (gdbarch, regnum));
+
+ VALUE_LVAL (reg_val) = lval;
+ set_value_address (reg_val, addr);
+ VALUE_REGNUM (reg_val) = regnum;
+ set_value_optimized_out (reg_val, optim);
+ if (unavail)
+ mark_value_bytes_unavailable (reg_val, 0, register_size (gdbarch, regnum));
+ VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
+ return reg_val;
+}
-/* Indicate that registers may have changed, so invalidate the cache. */
-void
-registers_changed ()
+/* Return a `value' with the contents of (virtual or cooked) register
+ REGNUM as found in the specified FRAME. The register's type is
+ determined by register_type(). The value is not fetched. */
+
+struct value *
+value_of_register_lazy (struct frame_info *frame, int regnum)
{
- int i;
- for (i = 0; i < NUM_REGS; i++)
- register_valid[i] = 0;
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct value *reg_val;
+
+ gdb_assert (regnum < (gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch)));
+
+ /* We should have a valid (i.e. non-sentinel) frame. */
+ gdb_assert (frame_id_p (get_frame_id (frame)));
+
+ reg_val = allocate_value_lazy (register_type (gdbarch, regnum));
+ VALUE_LVAL (reg_val) = lval_register;
+ VALUE_REGNUM (reg_val) = regnum;
+ VALUE_FRAME_ID (reg_val) = get_frame_id (frame);
+ return reg_val;
}
-/* Indicate that all registers have been fetched, so mark them all valid. */
-void
-registers_fetched ()
+/* Given a pointer of type TYPE in target form in BUF, return the
+ address it represents. */
+CORE_ADDR
+unsigned_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
{
- int i;
- for (i = 0; i < NUM_REGS; i++)
- register_valid[i] = 1;
-}
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-/* Copy LEN bytes of consecutive data from registers
- starting with the REGBYTE'th byte of register data
- into memory at MYADDR. */
+ return extract_unsigned_integer (buf, TYPE_LENGTH (type), byte_order);
+}
-void
-read_register_bytes (regbyte, myaddr, len)
- int regbyte;
- char *myaddr;
- int len;
+CORE_ADDR
+signed_pointer_to_address (struct gdbarch *gdbarch,
+ struct type *type, const gdb_byte *buf)
{
- /* Fetch all registers. */
- int i;
- for (i = 0; i < NUM_REGS; i++)
- if (!register_valid[i])
- {
- target_fetch_registers (-1);
- break;
- }
- if (myaddr != NULL)
- bcopy (®isters[regbyte], myaddr, len);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ return extract_signed_integer (buf, TYPE_LENGTH (type), byte_order);
}
-/* Read register REGNO into memory at MYADDR, which must be large enough
- for REGISTER_RAW_BYTES (REGNO). Target byte-order.
- If the register is known to be the size of a CORE_ADDR or smaller,
- read_register can be used instead. */
+/* Given an address, store it as a pointer of type TYPE in target
+ format in BUF. */
void
-read_register_gen (regno, myaddr)
- int regno;
- char *myaddr;
+unsigned_address_to_pointer (struct gdbarch *gdbarch, struct type *type,
+ gdb_byte *buf, CORE_ADDR addr)
{
- if (!register_valid[regno])
- target_fetch_registers (regno);
- bcopy (®isters[REGISTER_BYTE (regno)], myaddr, REGISTER_RAW_SIZE (regno));
-}
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-/* Copy LEN bytes of consecutive data from memory at MYADDR
- into registers starting with the REGBYTE'th byte of register data. */
+ store_unsigned_integer (buf, TYPE_LENGTH (type), byte_order, addr);
+}
void
-write_register_bytes (regbyte, myaddr, len)
- int regbyte;
- char *myaddr;
- int len;
+address_to_signed_pointer (struct gdbarch *gdbarch, struct type *type,
+ gdb_byte *buf, CORE_ADDR addr)
{
- /* Make sure the entire registers array is valid. */
- read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
- bcopy (myaddr, ®isters[regbyte], len);
- target_store_registers (-1);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+ store_signed_integer (buf, TYPE_LENGTH (type), byte_order, addr);
}
+
+/* Will calling read_var_value or locate_var_value on SYM end
+ up caring what frame it is being evaluated relative to? SYM must
+ be non-NULL. */
+int
+symbol_read_needs_frame (struct symbol *sym)
+{
+ switch (SYMBOL_CLASS (sym))
+ {
+ /* All cases listed explicitly so that gcc -Wall will detect it if
+ we failed to consider one. */
+ case LOC_COMPUTED:
+ /* FIXME: cagney/2004-01-26: It should be possible to
+ unconditionally call the SYMBOL_COMPUTED_OPS method when available.
+ Unfortunately DWARF 2 stores the frame-base (instead of the
+ function) location in a function's symbol. Oops! For the
+ moment enable this when/where applicable. */
+ return SYMBOL_COMPUTED_OPS (sym)->read_needs_frame (sym);
+
+ case LOC_REGISTER:
+ case LOC_ARG:
+ case LOC_REF_ARG:
+ case LOC_REGPARM_ADDR:
+ case LOC_LOCAL:
+ return 1;
-/* Return the contents of register REGNO, regarding it as an integer. */
+ case LOC_UNDEF:
+ case LOC_CONST:
+ case LOC_STATIC:
+ case LOC_TYPEDEF:
-CORE_ADDR
-read_register (regno)
- int regno;
-{
- int reg;
- if (!register_valid[regno])
- target_fetch_registers (regno);
- /* FIXME, this loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- reg = *(int *) ®isters[REGISTER_BYTE (regno)];
- SWAP_TARGET_AND_HOST (®, sizeof (int));
- return reg;
-}
+ case LOC_LABEL:
+ /* Getting the address of a label can be done independently of the block,
+ even if some *uses* of that address wouldn't work so well without
+ the right frame. */
-/* Registers we shouldn't try to store. */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
+ case LOC_BLOCK:
+ case LOC_CONST_BYTES:
+ case LOC_UNRESOLVED:
+ case LOC_OPTIMIZED_OUT:
+ return 0;
+ }
+ return 1;
+}
-/* Store VALUE in the register number REGNO, regarded as an integer. */
+/* Private data to be used with minsym_lookup_iterator_cb. */
-void
-write_register (regno, val)
- int regno, val;
+struct minsym_lookup_data
{
- /* On the sparc, writing %g0 is a no-op, so we don't even want to change
- the registers array if something writes to this register. */
- if (CANNOT_STORE_REGISTER (regno))
- return;
-
- SWAP_TARGET_AND_HOST (&val, sizeof (int));
+ /* The name of the minimal symbol we are searching for. */
+ const char *name;
+
+ /* The field where the callback should store the minimal symbol
+ if found. It should be initialized to NULL before the search
+ is started. */
+ struct minimal_symbol *result;
+};
+
+/* A callback function for gdbarch_iterate_over_objfiles_in_search_order.
+ It searches by name for a minimal symbol within the given OBJFILE.
+ The arguments are passed via CB_DATA, which in reality is a pointer
+ to struct minsym_lookup_data. */
+
+static int
+minsym_lookup_iterator_cb (struct objfile *objfile, void *cb_data)
+{
+ struct minsym_lookup_data *data = (struct minsym_lookup_data *) cb_data;
- target_prepare_to_store ();
+ gdb_assert (data->result == NULL);
- register_valid [regno] = 1;
- /* FIXME, this loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- /* FIXME, this depends on REGISTER_BYTE (regno) being aligned for host */
- *(int *) ®isters[REGISTER_BYTE (regno)] = val;
+ data->result = lookup_minimal_symbol (data->name, NULL, objfile);
- target_store_registers (regno);
+ /* The iterator should stop iff a match was found. */
+ return (data->result != NULL);
}
-/* Record that register REGNO contains VAL.
- This is used when the value is obtained from the inferior or core dump,
- so there is no need to store the value there. */
+/* A default implementation for the "la_read_var_value" hook in
+ the language vector which should work in most situations. */
-void
-supply_register (regno, val)
- int regno;
- char *val;
-{
- register_valid[regno] = 1;
- bcopy (val, ®isters[REGISTER_BYTE (regno)], REGISTER_RAW_SIZE (regno));
-}
-
-/* Given a struct symbol for a variable,
- and a stack frame id, read the value of the variable
- and return a (pointer to a) struct value containing the value.
- If the variable cannot be found, return a zero pointer.
- If FRAME is NULL, use the selected_frame. */
-
-value
-read_var_value (var, frame)
- register struct symbol *var;
- FRAME frame;
+struct value *
+default_read_var_value (struct symbol *var, struct frame_info *frame)
{
- register value v;
- struct frame_info *fi;
+ struct value *v;
struct type *type = SYMBOL_TYPE (var);
CORE_ADDR addr;
- register int len;
- v = allocate_value (type);
- VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
- len = TYPE_LENGTH (type);
+ /* Call check_typedef on our type to make sure that, if TYPE is
+ a TYPE_CODE_TYPEDEF, its length is set to the length of the target type
+ instead of zero. However, we do not replace the typedef type by the
+ target type, because we want to keep the typedef in order to be able to
+ set the returned value type description correctly. */
+ check_typedef (type);
- if (frame == 0) frame = selected_frame;
+ if (symbol_read_needs_frame (var))
+ gdb_assert (frame);
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
- bcopy (&SYMBOL_VALUE (var), VALUE_CONTENTS_RAW (v), len);
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
+ /* Put the constant back in target format. */
+ v = allocate_value (type);
+ store_signed_integer (value_contents_raw (v), TYPE_LENGTH (type),
+ gdbarch_byte_order (get_type_arch (type)),
+ (LONGEST) SYMBOL_VALUE (var));
VALUE_LVAL (v) = not_lval;
return v;
case LOC_LABEL:
- addr = SYMBOL_VALUE_ADDRESS (var);
- bcopy (&addr, VALUE_CONTENTS_RAW (v), len);
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
+ /* Put the constant back in target format. */
+ v = allocate_value (type);
+ if (overlay_debugging)
+ {
+ CORE_ADDR addr
+ = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
+ SYMBOL_OBJ_SECTION (var));
+
+ store_typed_address (value_contents_raw (v), type, addr);
+ }
+ else
+ store_typed_address (value_contents_raw (v), type,
+ SYMBOL_VALUE_ADDRESS (var));
VALUE_LVAL (v) = not_lval;
return v;
case LOC_CONST_BYTES:
- {
- char *bytes_addr;
- bytes_addr = SYMBOL_VALUE_BYTES (var);
- bcopy (bytes_addr, VALUE_CONTENTS_RAW (v), len);
- VALUE_LVAL (v) = not_lval;
- return v;
- }
+ v = allocate_value (type);
+ memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var),
+ TYPE_LENGTH (type));
+ VALUE_LVAL (v) = not_lval;
+ return v;
case LOC_STATIC:
- case LOC_EXTERNAL:
- addr = SYMBOL_VALUE_ADDRESS (var);
+ v = allocate_value_lazy (type);
+ if (overlay_debugging)
+ addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
+ SYMBOL_OBJ_SECTION (var));
+ else
+ addr = SYMBOL_VALUE_ADDRESS (var);
break;
-/* Nonzero if a struct which is located in a register or a LOC_ARG
- really contains
- the address of the struct, not the struct itself. GCC_P is nonzero
- if the function was compiled with GCC. */
-#if !defined (REG_STRUCT_HAS_ADDR)
-#define REG_STRUCT_HAS_ADDR(gcc_p) 0
-#endif
-
case LOC_ARG:
- fi = get_frame_info (frame);
- if (fi == NULL)
- return 0;
- addr = FRAME_ARGS_ADDRESS (fi);
- if (!addr) {
- return 0;
- }
+ addr = get_frame_args_address (frame);
+ if (!addr)
+ error (_("Unknown argument list address for `%s'."),
+ SYMBOL_PRINT_NAME (var));
addr += SYMBOL_VALUE (var);
+ v = allocate_value_lazy (type);
break;
-
+
case LOC_REF_ARG:
- fi = get_frame_info (frame);
- if (fi == NULL)
- return 0;
- addr = FRAME_ARGS_ADDRESS (fi);
- if (!addr) {
- return 0;
+ {
+ struct value *ref;
+ CORE_ADDR argref;
+
+ argref = get_frame_args_address (frame);
+ if (!argref)
+ error (_("Unknown argument list address for `%s'."),
+ SYMBOL_PRINT_NAME (var));
+ argref += SYMBOL_VALUE (var);
+ ref = value_at (lookup_pointer_type (type), argref);
+ addr = value_as_address (ref);
+ v = allocate_value_lazy (type);
+ break;
}
- addr += SYMBOL_VALUE (var);
- read_memory (addr, &addr, sizeof (CORE_ADDR));
- break;
-
+
case LOC_LOCAL:
- case LOC_LOCAL_ARG:
- fi = get_frame_info (frame);
- if (fi == NULL)
- return 0;
- addr = SYMBOL_VALUE (var) + FRAME_LOCALS_ADDRESS (fi);
+ addr = get_frame_locals_address (frame);
+ addr += SYMBOL_VALUE (var);
+ v = allocate_value_lazy (type);
break;
case LOC_TYPEDEF:
- error ("Cannot look up value of a typedef");
+ error (_("Cannot look up value of a typedef `%s'."),
+ SYMBOL_PRINT_NAME (var));
break;
case LOC_BLOCK:
- VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
- return v;
+ v = allocate_value_lazy (type);
+ if (overlay_debugging)
+ addr = symbol_overlayed_address
+ (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_OBJ_SECTION (var));
+ else
+ addr = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
+ break;
case LOC_REGISTER:
- case LOC_REGPARM:
+ case LOC_REGPARM_ADDR:
{
- struct block *b;
+ int regno = SYMBOL_REGISTER_OPS (var)
+ ->register_number (var, get_frame_arch (frame));
+ struct value *regval;
+
+ if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
+ {
+ regval = value_from_register (lookup_pointer_type (type),
+ regno,
+ frame);
+
+ if (regval == NULL)
+ error (_("Value of register variable not available for `%s'."),
+ SYMBOL_PRINT_NAME (var));
+
+ addr = value_as_address (regval);
+ v = allocate_value_lazy (type);
+ }
+ else
+ {
+ regval = value_from_register (type, regno, frame);
+
+ if (regval == NULL)
+ error (_("Value of register variable not available for `%s'."),
+ SYMBOL_PRINT_NAME (var));
+ return regval;
+ }
+ }
+ break;
- if (frame == NULL)
- return 0;
- b = get_frame_block (frame);
-
- v = value_from_register (type, SYMBOL_VALUE (var), frame);
+ case LOC_COMPUTED:
+ /* FIXME: cagney/2004-01-26: It should be possible to
+ unconditionally call the SYMBOL_COMPUTED_OPS method when available.
+ Unfortunately DWARF 2 stores the frame-base (instead of the
+ function) location in a function's symbol. Oops! For the
+ moment enable this when/where applicable. */
+ return SYMBOL_COMPUTED_OPS (var)->read_variable (var, frame);
- if (REG_STRUCT_HAS_ADDR (BLOCK_GCC_COMPILED (b))
- && TYPE_CODE (type) == TYPE_CODE_STRUCT)
- addr = *(CORE_ADDR *)VALUE_CONTENTS (v);
+ case LOC_UNRESOLVED:
+ {
+ struct minsym_lookup_data lookup_data;
+ struct minimal_symbol *msym;
+ struct obj_section *obj_section;
+
+ memset (&lookup_data, 0, sizeof (lookup_data));
+ lookup_data.name = SYMBOL_LINKAGE_NAME (var);
+
+ gdbarch_iterate_over_objfiles_in_search_order
+ (get_objfile_arch (SYMBOL_SYMTAB (var)->objfile),
+ minsym_lookup_iterator_cb, &lookup_data,
+ SYMBOL_SYMTAB (var)->objfile);
+ msym = lookup_data.result;
+
+ if (msym == NULL)
+ error (_("No global symbol \"%s\"."), SYMBOL_LINKAGE_NAME (var));
+ if (overlay_debugging)
+ addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
+ SYMBOL_OBJ_SECTION (msym));
else
- return v;
+ addr = SYMBOL_VALUE_ADDRESS (msym);
+
+ obj_section = SYMBOL_OBJ_SECTION (msym);
+ if (obj_section
+ && (obj_section->the_bfd_section->flags & SEC_THREAD_LOCAL) != 0)
+ addr = target_translate_tls_address (obj_section->objfile, addr);
+ v = allocate_value_lazy (type);
}
break;
+ case LOC_OPTIMIZED_OUT:
+ return allocate_optimized_out_value (type);
+
default:
- error ("Cannot look up value of a botched symbol.");
+ error (_("Cannot look up value of a botched symbol `%s'."),
+ SYMBOL_PRINT_NAME (var));
break;
}
- VALUE_ADDRESS (v) = addr;
- VALUE_LAZY (v) = 1;
+ VALUE_LVAL (v) = lval_memory;
+ set_value_address (v, addr);
return v;
}
-/* Return a value of type TYPE, stored in register REGNUM, in frame
- FRAME. */
+/* Calls VAR's language la_read_var_value hook with the given arguments. */
-value
-value_from_register (type, regnum, frame)
- struct type *type;
- int regnum;
- FRAME frame;
+struct value *
+read_var_value (struct symbol *var, struct frame_info *frame)
{
- char raw_buffer [MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
- CORE_ADDR addr;
- int optim;
- value v = allocate_value (type);
- int len = TYPE_LENGTH (type);
- char *value_bytes = 0;
- int value_bytes_copied = 0;
- int num_storage_locs;
- enum lval_type lval;
+ const struct language_defn *lang = language_def (SYMBOL_LANGUAGE (var));
- VALUE_REGNO (v) = regnum;
+ gdb_assert (lang != NULL);
+ gdb_assert (lang->la_read_var_value != NULL);
- num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ?
- ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
- 1);
+ return lang->la_read_var_value (var, frame);
+}
- if (num_storage_locs > 1)
- {
- /* Value spread across multiple storage locations. */
-
- int local_regnum;
- int mem_stor = 0, reg_stor = 0;
- int mem_tracking = 1;
- CORE_ADDR last_addr = 0;
- CORE_ADDR first_addr;
-
- value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE);
-
- /* Copy all of the data out, whereever it may be. */
-
- for (local_regnum = regnum;
- value_bytes_copied < len;
- (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
- ++local_regnum))
- {
- get_saved_register (value_bytes + value_bytes_copied,
- &optim,
- &addr,
- frame,
- local_regnum,
- &lval);
- if (lval == lval_register)
- reg_stor++;
- else
- {
- mem_stor++;
-
- if (regnum == local_regnum)
- first_addr = addr;
-
- mem_tracking =
- (mem_tracking
- && (regnum == local_regnum
- || addr == last_addr));
- }
- last_addr = addr;
- }
+/* Install default attributes for register values. */
- if ((reg_stor && mem_stor)
- || (mem_stor && !mem_tracking))
- /* Mixed storage; all of the hassle we just went through was
- for some good purpose. */
- {
- VALUE_LVAL (v) = lval_reg_frame_relative;
- VALUE_FRAME (v) = FRAME_FP (frame);
- VALUE_FRAME_REGNUM (v) = regnum;
- }
- else if (mem_stor)
- {
- VALUE_LVAL (v) = lval_memory;
- VALUE_ADDRESS (v) = first_addr;
- }
- else if (reg_stor)
- {
- VALUE_LVAL (v) = lval_register;
- VALUE_ADDRESS (v) = first_addr;
- }
- else
- fatal ("value_from_register: Value not stored anywhere!");
+struct value *
+default_value_from_register (struct type *type, int regnum,
+ struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ int len = TYPE_LENGTH (type);
+ struct value *value = allocate_value (type);
+
+ VALUE_LVAL (value) = lval_register;
+ VALUE_FRAME_ID (value) = get_frame_id (frame);
+ VALUE_REGNUM (value) = regnum;
+
+ /* Any structure stored in more than one register will always be
+ an integral number of registers. Otherwise, you need to do
+ some fiddling with the last register copied here for little
+ endian machines. */
+ if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG
+ && len < register_size (gdbarch, regnum))
+ /* Big-endian, and we want less than full size. */
+ set_value_offset (value, register_size (gdbarch, regnum) - len);
+ else
+ set_value_offset (value, 0);
- VALUE_OPTIMIZED_OUT (v) = optim;
+ return value;
+}
- /* Any structure stored in more than one register will always be
- an integral number of registers. Otherwise, you'd need to do
- some fiddling with the last register copied here for little
- endian machines. */
+/* VALUE must be an lval_register value. If regnum is the value's
+ associated register number, and len the length of the values type,
+ read one or more registers in FRAME, starting with register REGNUM,
+ until we've read LEN bytes.
- /* Copy into the contents section of the value. */
- bcopy (value_bytes, VALUE_CONTENTS_RAW (v), len);
+ If any of the registers we try to read are optimized out, then mark the
+ complete resulting value as optimized out. */
- return v;
- }
+void
+read_frame_register_value (struct value *value, struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ int offset = 0;
+ int reg_offset = value_offset (value);
+ int regnum = VALUE_REGNUM (value);
+ int len = TYPE_LENGTH (check_typedef (value_type (value)));
+
+ gdb_assert (VALUE_LVAL (value) == lval_register);
- /* Data is completely contained within a single register. Locate the
- register's contents in a real register or in core;
- read the data in raw format. */
-
- get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval);
- VALUE_OPTIMIZED_OUT (v) = optim;
- VALUE_LVAL (v) = lval;
- VALUE_ADDRESS (v) = addr;
-
- /* Convert the raw contents to virtual contents.
- (Just copy them if the formats are the same.) */
-
- target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
-
- if (REGISTER_CONVERTIBLE (regnum))
+ /* Skip registers wholly inside of REG_OFFSET. */
+ while (reg_offset >= register_size (gdbarch, regnum))
{
- /* When the raw and virtual formats differ, the virtual format
- corresponds to a specific data type. If we want that type,
- copy the data into the value.
- Otherwise, do a type-conversion. */
-
- if (type != REGISTER_VIRTUAL_TYPE (regnum))
- {
- /* eg a variable of type `float' in a 68881 register
- with raw type `extended' and virtual type `double'.
- Fetch it as a `double' and then convert to `float'. */
- v = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (v), len);
- v = value_cast (type, v);
- }
- else
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (v), len);
+ reg_offset -= register_size (gdbarch, regnum);
+ regnum++;
}
- else
+
+ /* Copy the data. */
+ while (len > 0)
{
- /* Raw and virtual formats are the same for this register. */
+ struct value *regval = get_frame_register_value (frame, regnum);
+ int reg_len = TYPE_LENGTH (value_type (regval)) - reg_offset;
-#if TARGET_BYTE_ORDER == BIG_ENDIAN
- if (len < REGISTER_RAW_SIZE (regnum))
+ if (value_optimized_out (regval))
{
- /* Big-endian, and we want less than full size. */
- VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
+ set_value_optimized_out (value, 1);
+ break;
}
-#endif
- bcopy (virtual_buffer + VALUE_OFFSET (v),
- VALUE_CONTENTS_RAW (v), len);
+ /* If the register length is larger than the number of bytes
+ remaining to copy, then only copy the appropriate bytes. */
+ if (reg_len > len)
+ reg_len = len;
+
+ value_contents_copy (value, offset, regval, reg_offset, reg_len);
+
+ offset += reg_len;
+ len -= reg_len;
+ reg_offset = 0;
+ regnum++;
}
-
- return v;
}
-
-/* Given a struct symbol for a variable or function,
- and a stack frame id,
- return a (pointer to a) struct value containing the properly typed
- address. */
-
-value
-locate_var_value (var, frame)
- register struct symbol *var;
- FRAME frame;
-{
- CORE_ADDR addr = 0;
- struct type *type = SYMBOL_TYPE (var);
- struct type *result_type;
- value lazy_value;
- /* Evaluate it first; if the result is a memory address, we're fine.
- Lazy evaluation pays off here. */
+/* Return a value of type TYPE, stored in register REGNUM, in frame FRAME. */
- lazy_value = read_var_value (var, frame);
- if (lazy_value == 0)
- error ("Address of \"%s\" is unknown.", SYMBOL_NAME (var));
+struct value *
+value_from_register (struct type *type, int regnum, struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct type *type1 = check_typedef (type);
+ struct value *v;
- if (VALUE_LAZY (lazy_value)
- || TYPE_CODE (type) == TYPE_CODE_FUNC)
+ if (gdbarch_convert_register_p (gdbarch, regnum, type1))
{
- addr = VALUE_ADDRESS (lazy_value);
-
- /* C++: The "address" of a reference should yield the address
- * of the object pointed to. So force an extra de-reference. */
-
- if (TYPE_CODE (type) == TYPE_CODE_REF)
+ int optim, unavail, ok;
+
+ /* The ISA/ABI need to something weird when obtaining the
+ specified value from this register. It might need to
+ re-order non-adjacent, starting with REGNUM (see MIPS and
+ i386). It might need to convert the [float] register into
+ the corresponding [integer] type (see Alpha). The assumption
+ is that gdbarch_register_to_value populates the entire value
+ including the location. */
+ v = allocate_value (type);
+ VALUE_LVAL (v) = lval_register;
+ VALUE_FRAME_ID (v) = get_frame_id (frame);
+ VALUE_REGNUM (v) = regnum;
+ ok = gdbarch_register_to_value (gdbarch, frame, regnum, type1,
+ value_contents_raw (v), &optim,
+ &unavail);
+
+ if (!ok)
{
- char *buf = alloca (TYPE_LENGTH (type));
- read_memory (addr, buf, TYPE_LENGTH (type));
- addr = unpack_pointer (type, buf);
- type = TYPE_TARGET_TYPE (type);
+ if (optim)
+ set_value_optimized_out (v, 1);
+ if (unavail)
+ mark_value_bytes_unavailable (v, 0, TYPE_LENGTH (type));
}
-
- /* Address of an array is of the type of address of it's elements. */
- /* FIXME, this is probably wrong now for ANSI C. */
- result_type =
- lookup_pointer_type (TYPE_CODE (type) == TYPE_CODE_ARRAY ?
- TYPE_TARGET_TYPE (type) : type);
-
- return value_cast (result_type,
- value_from_long (builtin_type_long, (LONGEST) addr));
}
-
- /* Not a memory address; check what the problem was. */
- switch (VALUE_LVAL (lazy_value))
+ else
{
- case lval_register:
- case lval_reg_frame_relative:
- error ("Address requested for identifier \"%s\" which is in a register.",
- SYMBOL_NAME (var));
- break;
+ /* Construct the value. */
+ v = gdbarch_value_from_register (gdbarch, type, regnum, frame);
- default:
- error ("Can't take address of \"%s\" which isn't an lvalue.",
- SYMBOL_NAME (var));
- break;
+ /* Get the data. */
+ read_frame_register_value (v, frame);
}
- return 0; /* For lint -- never reached */
+
+ return v;
+}
+
+/* Return contents of register REGNUM in frame FRAME as address,
+ interpreted as value of type TYPE. Will abort if register
+ value is not available. */
+
+CORE_ADDR
+address_from_register (struct type *type, int regnum, struct frame_info *frame)
+{
+ struct value *value;
+ CORE_ADDR result;
+
+ value = value_from_register (type, regnum, frame);
+ gdb_assert (value);
+
+ result = value_as_address (value);
+ release_value (value);
+ value_free (value);
+
+ return result;
}
+