/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
+This file is part of GDB.
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
+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.
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
-*/
+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, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
-#include "initialize.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"
-CORE_ADDR read_register ();
+#if !defined (GET_SAVED_REGISTER)
-START_FILE
-\f
/* 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. */
-static CORE_ADDR
+CORE_ADDR
find_saved_register (frame, regnum)
FRAME frame;
int regnum;
{
- struct frame_info fi;
+ 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))
+ {
+ 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 */
+ }
+#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)
{
QUIT;
- fi = get_prev_frame_info (frame1);
- if (fi.frame == 0 || fi.frame == frame)
+ frame1 = get_prev_frame (frame1);
+ if (frame1 == 0 || frame1 == frame)
break;
- get_frame_saved_regs (&fi, &saved_regs);
+ fi = get_frame_info (frame1);
+ get_frame_saved_regs (fi, &saved_regs);
if (saved_regs.regs[regnum])
addr = saved_regs.regs[regnum];
- frame1 = fi.frame;
}
return addr;
}
-/* Copy the bytes of register REGNUM, relative to the current stack frame,
- into our memory at MYADDR.
- The number of bytes copied is REGISTER_RAW_SIZE (REGNUM). */
+/* 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.
+ The argument RAW_BUFFER must point to aligned memory. */
void
-read_relative_register_raw_bytes (regnum, myaddr)
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+ char *raw_buffer;
+ int *optimized;
+ CORE_ADDR *addrp;
+ FRAME frame;
int regnum;
- char *myaddr;
+ enum lval_type *lval;
{
- register CORE_ADDR addr;
-
- if (regnum == FP_REGNUM)
+ 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 != 0)
+ {
+ if (lval != NULL)
+ *lval = lval_memory;
+ if (regnum == SP_REGNUM)
+ {
+ if (raw_buffer != NULL)
+ *(CORE_ADDR *)raw_buffer = addr;
+ if (addrp != NULL)
+ *addrp = 0;
+ return;
+ }
+ if (raw_buffer != NULL)
+ read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
+ }
+ else
{
- bcopy (&selected_frame, myaddr, sizeof (CORE_ADDR));
- return;
+ if (lval != NULL)
+ *lval = lval_register;
+ addr = REGISTER_BYTE (regnum);
+ if (raw_buffer != NULL)
+ read_register_gen (regnum, raw_buffer);
}
+ 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).
- addr = find_saved_register (selected_frame, regnum);
+ Returns 1 if could not be read, 0 if could. */
- if (addr)
+int
+read_relative_register_raw_bytes (regnum, myaddr)
+ int regnum;
+ char *myaddr;
+{
+ int optim;
+ if (regnum == FP_REGNUM && selected_frame)
{
- if (regnum == SP_REGNUM)
- {
- CORE_ADDR buffer = addr;
- bcopy (&buffer, myaddr, sizeof (CORE_ADDR));
- }
- else
- read_memory (addr, myaddr, REGISTER_RAW_SIZE (regnum));
- return;
+ (void) memcpy (myaddr, &FRAME_FP(selected_frame),
+ REGISTER_RAW_SIZE(FP_REGNUM));
+ SWAP_TARGET_AND_HOST (myaddr, REGISTER_RAW_SIZE(FP_REGNUM)); /* in target order */
+ return 0;
}
- read_register_bytes (REGISTER_BYTE (regnum),
- myaddr, REGISTER_RAW_SIZE (regnum));
+
+ get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
+ regnum, (enum lval_type *)NULL);
+ return optim;
}
/* Return a `value' with the contents of register REGNUM
value_of_register (regnum)
int regnum;
{
- register CORE_ADDR addr = find_saved_register (selected_frame, regnum);
+ CORE_ADDR addr;
+ int optim;
register value val;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+ enum lval_type lval;
- if (addr)
- {
- if (regnum == SP_REGNUM)
- return value_from_long (builtin_type_int, addr);
- read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
- }
- else
- read_register_bytes (REGISTER_BYTE (regnum), raw_buffer,
- REGISTER_RAW_SIZE (regnum));
+ get_saved_register (raw_buffer, &optim, &addr,
+ selected_frame, regnum, &lval);
- REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
+ target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS (val), REGISTER_VIRTUAL_SIZE (regnum));
- VALUE_LVAL (val) = addr ? lval_memory : lval_register;
- VALUE_ADDRESS (val) = addr ? addr : REGISTER_BYTE (regnum);
+ (void) memcpy (VALUE_CONTENTS_RAW (val), virtual_buffer,
+ REGISTER_VIRTUAL_SIZE (regnum));
+ VALUE_LVAL (val) = lval;
+ VALUE_ADDRESS (val) = addr;
VALUE_REGNO (val) = regnum;
+ VALUE_OPTIMIZED_OUT (val) = optim;
return val;
}
\f
/* Low level examining and depositing of registers.
- Note that you must call `fetch_registers' once
- before examining or depositing any registers. */
+ 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). */
+
+/* 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];
+
+/* Nonzero if that register has been fetched. */
+char register_valid[NUM_REGS];
+
+/* Indicate that registers may have changed, so invalidate the cache. */
+void
+registers_changed ()
+{
+ int i;
+ for (i = 0; i < NUM_REGS; i++)
+ register_valid[i] = 0;
+}
-char registers[REGISTER_BYTES];
+/* Indicate that all registers have been fetched, so mark them all valid. */
+void
+registers_fetched ()
+{
+ int i;
+ for (i = 0; i < NUM_REGS; i++)
+ register_valid[i] = 1;
+}
/* Copy LEN bytes of consecutive data from registers
starting with the REGBYTE'th byte of register data
into memory at MYADDR. */
+void
read_register_bytes (regbyte, myaddr, len)
int regbyte;
char *myaddr;
int len;
{
- bcopy (®isters[regbyte], myaddr, len);
+ /* Fetch all registers. */
+ int i;
+ for (i = 0; i < NUM_REGS; i++)
+ if (!register_valid[i])
+ {
+ target_fetch_registers (-1);
+ break;
+ }
+ if (myaddr != NULL)
+ (void) memcpy (myaddr, ®isters[regbyte], len);
+}
+
+/* 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. */
+void
+read_register_gen (regno, myaddr)
+ int regno;
+ char *myaddr;
+{
+ if (!register_valid[regno])
+ target_fetch_registers (regno);
+ (void) memcpy (myaddr, ®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE (regno));
}
/* Copy LEN bytes of consecutive data from memory at MYADDR
into registers starting with the REGBYTE'th byte of register data. */
+void
write_register_bytes (regbyte, myaddr, len)
int regbyte;
char *myaddr;
int len;
{
- bcopy (myaddr, ®isters[regbyte], len);
- if (have_inferior_p ())
- store_inferior_registers (-1);
+ /* Make sure the entire registers array is valid. */
+ read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
+ (void) memcpy (®isters[regbyte], myaddr, len);
+ target_store_registers (-1);
}
-/* Return the contents of register REGNO,
- regarding it as an integer. */
+/* Return the contents of register REGNO, regarding it as an integer. */
+/* FIXME, this loses when the REGISTER_VIRTUAL (REGNO) is true. Also,
+ why is the return type CORE_ADDR rather than some integer type? */
CORE_ADDR
read_register (regno)
int regno;
{
- /* This loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- return *(int *) ®isters[REGISTER_BYTE (regno)];
+ REGISTER_TYPE reg;
+
+ if (!register_valid[regno])
+ target_fetch_registers (regno);
+ memcpy (®, ®isters[REGISTER_BYTE (regno)], sizeof (REGISTER_TYPE));
+ SWAP_TARGET_AND_HOST (®, sizeof (REGISTER_TYPE));
+ return reg;
}
+/* Registers we shouldn't try to store. */
+#if !defined (CANNOT_STORE_REGISTER)
+#define CANNOT_STORE_REGISTER(regno) 0
+#endif
+
/* Store VALUE in the register number REGNO, regarded as an integer. */
+/* FIXME, this loses when REGISTER_VIRTUAL (REGNO) is true. Also,
+ shouldn't the val arg be a LONGEST or something? */
void
write_register (regno, val)
int regno, val;
{
- /* This loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- *(int *) ®isters[REGISTER_BYTE (regno)] = val;
+ REGISTER_TYPE reg;
+
+ /* 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;
+
+ reg = val;
+ SWAP_TARGET_AND_HOST (®, sizeof (REGISTER_TYPE));
- if (have_inferior_p ())
- store_inferior_registers (regno);
+ target_prepare_to_store ();
+
+ register_valid [regno] = 1;
+ memcpy (®isters[REGISTER_BYTE (regno)], ®, sizeof (REGISTER_TYPE));
+
+ target_store_registers (regno);
}
/* Record that register REGNO contains VAL.
int regno;
char *val;
{
- bcopy (val, ®isters[REGISTER_BYTE (regno)], REGISTER_RAW_SIZE (regno));
+ register_valid[regno] = 1;
+ (void) memcpy (®isters[REGISTER_BYTE (regno)], val,
+ REGISTER_RAW_SIZE (regno));
}
\f
/* Given a struct symbol for a variable,
- and a stack frame address, read the value of the variable
- and return a (pointer to a) struct value containing the value. */
+ 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)
FRAME frame;
{
register value v;
-
- struct frame_info fi;
-
+ struct frame_info *fi;
struct type *type = SYMBOL_TYPE (var);
- register CORE_ADDR addr = 0;
- int val = SYMBOL_VALUE (var);
+ CORE_ADDR addr;
register int len;
- if (SYMBOL_CLASS (var) == LOC_BLOCK)
- type = lookup_function_type (type);
-
v = allocate_value (type);
VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
len = TYPE_LENGTH (type);
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
- case LOC_LABEL:
- bcopy (&val, VALUE_CONTENTS (v), len);
+ (void) memcpy (VALUE_CONTENTS_RAW (v), &SYMBOL_VALUE (var), len);
+ SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
VALUE_LVAL (v) = not_lval;
return v;
- case LOC_CONST_BYTES:
- bcopy (val, VALUE_CONTENTS (v), len);
+ case LOC_LABEL:
+ addr = SYMBOL_VALUE_ADDRESS (var);
+ (void) memcpy (VALUE_CONTENTS_RAW (v), &addr, len);
+ SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
VALUE_LVAL (v) = not_lval;
return v;
+ case LOC_CONST_BYTES:
+ {
+ char *bytes_addr;
+ bytes_addr = SYMBOL_VALUE_BYTES (var);
+ (void) memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len);
+ VALUE_LVAL (v) = not_lval;
+ return v;
+ }
+
case LOC_STATIC:
- addr = val;
+ addr = SYMBOL_VALUE_ADDRESS (var);
break;
case LOC_ARG:
- fi = get_frame_info (frame);
- addr = val + FRAME_ARGS_ADDRESS (fi);
+ if (SYMBOL_BASEREG_VALID (var))
+ {
+ addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
+ }
+ else
+ {
+ fi = get_frame_info (frame);
+ if (fi == NULL)
+ return 0;
+ addr = FRAME_ARGS_ADDRESS (fi);
+ }
+ if (!addr)
+ {
+ return 0;
+ }
+ addr += SYMBOL_VALUE (var);
break;
-
+
+ case LOC_REF_ARG:
+ if (SYMBOL_BASEREG_VALID (var))
+ {
+ addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
+ }
+ else
+ {
+ fi = get_frame_info (frame);
+ if (fi == NULL)
+ return 0;
+ addr = FRAME_ARGS_ADDRESS (fi);
+ }
+ if (!addr)
+ {
+ return 0;
+ }
+ addr += SYMBOL_VALUE (var);
+ read_memory (addr, (char *) &addr, sizeof (CORE_ADDR));
+ break;
+
case LOC_LOCAL:
- fi = get_frame_info (frame);
- addr = val + FRAME_LOCALS_ADDRESS (fi);
+ case LOC_LOCAL_ARG:
+ if (SYMBOL_BASEREG_VALID (var))
+ {
+ addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
+ }
+ else
+ {
+ fi = get_frame_info (frame);
+ if (fi == NULL)
+ return 0;
+ addr = FRAME_LOCALS_ADDRESS (fi);
+ }
+ addr += SYMBOL_VALUE (var);
break;
case LOC_TYPEDEF:
error ("Cannot look up value of a typedef");
+ break;
case LOC_BLOCK:
VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
return v;
case LOC_REGISTER:
+ case LOC_REGPARM:
{
- char raw_buffer[MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+ struct block *b;
+
+ if (frame == NULL)
+ return 0;
+ b = get_frame_block (frame);
+
+ v = value_from_register (type, SYMBOL_VALUE (var), frame);
+
+ /* 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
+
+ if (REG_STRUCT_HAS_ADDR (BLOCK_GCC_COMPILED (b))
+ && ( (TYPE_CODE (type) == TYPE_CODE_STRUCT)
+ || (TYPE_CODE (type) == TYPE_CODE_UNION)))
+ addr = *(CORE_ADDR *)VALUE_CONTENTS (v);
+ else
+ return v;
+ }
+ break;
+
+ default:
+ error ("Cannot look up value of a botched symbol.");
+ break;
+ }
+
+ VALUE_ADDRESS (v) = addr;
+ VALUE_LAZY (v) = 1;
+ return v;
+}
+
+/* Return a value of type TYPE, stored in register REGNUM, in frame
+ FRAME. */
- VALUE_REGNO (v) = val;
+value
+value_from_register (type, regnum, frame)
+ struct type *type;
+ int regnum;
+ FRAME 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;
+
+ VALUE_REGNO (v) = regnum;
+
+ num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ?
+ ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
+ 1);
+
+ 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;
+ }
- /* Locate the register's contents in a real register or in core;
- read the data in raw format. */
+ 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!");
- addr = find_saved_register (frame, val);
- if (addr == 0)
- {
- /* Value is really in a register. */
+ VALUE_OPTIMIZED_OUT (v) = optim;
- VALUE_LVAL (v) = lval_register;
- VALUE_ADDRESS (v) = REGISTER_BYTE (val);
+ /* 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. */
- read_register_bytes (REGISTER_BYTE (val),
- raw_buffer, REGISTER_RAW_SIZE (val));
- }
- else
- {
- /* Value was in a register that has been saved in memory. */
-
- read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (val));
- VALUE_ADDRESS (v) = addr;
- }
-
- /* Convert the raw contents to virtual contents.
- (Just copy them if the formats are the same.) */
-
- REGISTER_CONVERT_TO_VIRTUAL (val, raw_buffer, virtual_buffer);
-
- if (REGISTER_CONVERTIBLE (val))
- {
- /* 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 (val))
- {
- /* 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 (val));
- bcopy (virtual_buffer, VALUE_CONTENTS (v), len);
- v = value_cast (type, v);
- }
- else
- bcopy (virtual_buffer, VALUE_CONTENTS (v), len);
- }
- else
- {
- /* Raw and virtual formats are the same for this register. */
-
- union { int i; char c; } test;
- /* If we want less than the full size, we need to
- test for a big-endian or little-endian machine. */
- test.i = 1;
- if (test.c != 1 && len < REGISTER_RAW_SIZE (val))
- {
- /* Big-endian, and we want less than full size. */
- VALUE_OFFSET (v) = REGISTER_RAW_SIZE (val) - len;
- }
-
- bcopy (virtual_buffer + VALUE_OFFSET (v),
- VALUE_CONTENTS (v), len);
- }
+ /* Copy into the contents section of the value. */
+ (void) memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len);
- return v;
- }
+ return v;
}
- read_memory (addr, VALUE_CONTENTS (v), len);
+ /* 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))
+ {
+ /* 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));
+ (void) memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
+ v = value_cast (type, v);
+ }
+ else
+ (void) memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
+ }
+ else
+ {
+ /* Raw and virtual formats are the same for this register. */
+
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ if (len < REGISTER_RAW_SIZE (regnum))
+ {
+ /* Big-endian, and we want less than full size. */
+ VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
+ }
+#endif
+
+ (void) memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer + VALUE_OFFSET (v),
+ len);
+ }
+
return v;
}
\f
-/* Given a struct symbol for a variable,
- and a stack frame address,
- return a (pointer to a) struct value containing the variable's address. */
+/* 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;
{
- register CORE_ADDR addr = 0;
- int val = SYMBOL_VALUE (var);
- struct frame_info fi;
+ CORE_ADDR addr = 0;
+ struct type *type = SYMBOL_TYPE (var);
+ value lazy_value;
- if (frame == 0) frame = selected_frame;
+ /* Evaluate it first; if the result is a memory address, we're fine.
+ Lazy evaluation pays off here. */
- switch (SYMBOL_CLASS (var))
+ lazy_value = read_var_value (var, frame);
+ if (lazy_value == 0)
+ error ("Address of \"%s\" is unknown.", SYMBOL_NAME (var));
+
+ if (VALUE_LAZY (lazy_value)
+ || TYPE_CODE (type) == TYPE_CODE_FUNC)
{
- case LOC_CONST:
- case LOC_CONST_BYTES:
- error ("Address requested for identifier \"%s\" which is a constant.",
- SYMBOL_NAME (var));
+ addr = VALUE_ADDRESS (lazy_value);
+ return value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
+ }
- case LOC_REGISTER:
- addr = find_saved_register (frame, val);
- if (addr != 0)
- {
- union { int i; char c; } test;
- int len = TYPE_LENGTH (SYMBOL_TYPE (var));
- /* If var is less than the full size of register, we need to
- test for a big-endian or little-endian machine. */
- test.i = 1;
- if (test.c != 1 && len < REGISTER_RAW_SIZE (val))
- /* Big-endian, and we want less than full size. */
- addr+ = REGISTER_RAW_SIZE (val) - len;
- break;
- }
+ /* Not a memory address; check what the problem was. */
+ switch (VALUE_LVAL (lazy_value))
+ {
+ case lval_register:
+ case lval_reg_frame_relative:
error ("Address requested for identifier \"%s\" which is in a register.",
SYMBOL_NAME (var));
-
- case LOC_STATIC:
- case LOC_LABEL:
- addr = val;
- break;
-
- case LOC_ARG:
- fi = get_frame_info (frame);
- addr = val + FRAME_ARGS_ADDRESS (fi);
break;
- case LOC_LOCAL:
- fi = get_frame_info (frame);
- addr = val + FRAME_LOCALS_ADDRESS (fi);
- break;
-
- case LOC_TYPEDEF:
- error ("Address requested for identifier \"%s\" which is a typedef.",
+ default:
+ error ("Can't take address of \"%s\" which isn't an lvalue.",
SYMBOL_NAME (var));
-
- case LOC_BLOCK:
- addr = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
break;
}
-
- return value_cast (lookup_pointer_type (SYMBOL_TYPE (var)),
- value_from_long (builtin_type_long, addr));
+ return 0; /* For lint -- never reached */
}
-
-static
-initialize ()
-{}
-
-END_FILE
projects / deliverable / binutils-gdb.git / blobdiff