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gdb-3.1

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gdb-3.1
1989-01-31 17:56:40 +00:00
committed by Pedro Alves
parent bb7592f010
commit e91b87a368
150 changed files with 54576 additions and 10225 deletions
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308
gdb/findvar.c
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@@ -19,7 +19,6 @@ anyone else from sharing it farther. Help stamp out software hoarding!
*/
#include "defs.h"
#include "initialize.h"
#include "param.h"
#include "symtab.h"
#include "frame.h"
@@ -27,34 +26,56 @@ anyone else from sharing it farther. Help stamp out software hoarding!
CORE_ADDR read_register ();
START_FILE
/* 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;
#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 dissapears 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. */
if (REGISTER_IN_WINDOW_P(regnum))
{
fi = get_frame_info (frame);
get_frame_saved_regs (fi, &saved_regs);
return (saved_regs.regs[regnum] ?
saved_regs.regs[regnum] : 0);
}
#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;
@@ -73,7 +94,7 @@ read_relative_register_raw_bytes (regnum, myaddr)
if (regnum == FP_REGNUM)
{
bcopy (&selected_frame, myaddr, sizeof (CORE_ADDR));
bcopy (&FRAME_FP(selected_frame), myaddr, sizeof (CORE_ADDR));
return;
}
@@ -102,15 +123,19 @@ value
value_of_register (regnum)
int regnum;
{
register CORE_ADDR addr = find_saved_register (selected_frame, regnum);
register CORE_ADDR addr;
register value val;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
if (! (have_inferior_p () || have_core_file_p ()))
error ("Can't get value of register without inferior or core file");
addr = find_saved_register (selected_frame, regnum);
if (addr)
{
if (regnum == SP_REGNUM)
return value_from_long (builtin_type_int, addr);
return value_from_long (builtin_type_int, (LONGEST) addr);
read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
}
else
@@ -137,6 +162,7 @@ char registers[REGISTER_BYTES];
starting with the REGBYTE'th byte of register data
into memory at MYADDR. */
void
read_register_bytes (regbyte, myaddr, len)
int regbyte;
char *myaddr;
@@ -148,6 +174,7 @@ read_register_bytes (regbyte, myaddr, len)
/* 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;
@@ -211,7 +238,7 @@ read_var_value (var, frame)
{
register value v;
struct frame_info fi;
struct frame_info *fi;
struct type *type = SYMBOL_TYPE (var);
register CORE_ADDR addr = 0;
@@ -260,84 +287,178 @@ read_var_value (var, frame)
case LOC_REGISTER:
case LOC_REGPARM:
{
char raw_buffer[MAX_REGISTER_RAW_SIZE];
char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
VALUE_REGNO (v) = val;
/* Locate the register's contents in a real register or in core;
read the data in raw format. */
addr = find_saved_register (frame, val);
if (addr == 0)
{
/* Value is really in a register. */
VALUE_LVAL (v) = lval_register;
VALUE_ADDRESS (v) = REGISTER_BYTE (val);
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);
}
return v;
}
v = value_from_register (type, val, frame);
return v;
}
read_memory (addr, VALUE_CONTENTS (v), len);
VALUE_ADDRESS (v) = addr;
return v;
}
/* Return a value of type TYPE, stored in register REGNUM, in frame
FRAME. */
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;
value v = allocate_value (type);
int len = TYPE_LENGTH (type);
char *value_bytes = 0;
int value_bytes_copied = 0;
int num_storage_locs;
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;
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))
{
int register_index = local_regnum - regnum;
addr = find_saved_register (frame, local_regnum);
if (addr == 0)
{
read_register_bytes (REGISTER_BYTE (local_regnum),
value_bytes + value_bytes_copied,
REGISTER_RAW_SIZE (local_regnum));
reg_stor++;
}
else
{
read_memory (addr, value_bytes + value_bytes_copied,
REGISTER_RAW_SIZE (local_regnum));
mem_stor++;
mem_tracking =
(mem_tracking
&& (regnum == local_regnum
|| addr == last_addr));
}
last_addr = addr;
}
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) = find_saved_register (frame, regnum);
}
else if (reg_stor)
{
VALUE_LVAL (v) = lval_register;
VALUE_ADDRESS (v) = REGISTER_BYTE (regnum);
}
else
fatal ("value_from_register: Value not stored anywhere!");
/* Any structure stored in more than one register will always be
an inegral number of registers. Otherwise, you'd need to do
some fiddling with the last register copied here for little
endian machines. */
/* Copy into the contents section of the value. */
bcopy (value_bytes, VALUE_CONTENTS (v), len);
return v;
}
/* 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. */
addr = find_saved_register (frame, regnum);
if (addr == 0)
{
/* Value is really in a register. */
VALUE_LVAL (v) = lval_register;
VALUE_ADDRESS (v) = REGISTER_BYTE (regnum);
read_register_bytes (REGISTER_BYTE (regnum),
raw_buffer, REGISTER_RAW_SIZE (regnum));
}
else
{
/* Value was in a register that has been saved in memory. */
read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
VALUE_LVAL (v) = lval_memory;
VALUE_ADDRESS (v) = addr;
}
/* Convert the raw contents to virtual contents.
(Just copy them if the formats are the same.) */
REGISTER_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));
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. */
#ifdef BYTES_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
bcopy (virtual_buffer + VALUE_OFFSET (v),
VALUE_CONTENTS (v), len);
}
return v;
}
/* Given a struct symbol for a variable,
and a stack frame address,
@@ -350,7 +471,7 @@ locate_var_value (var, frame)
{
register CORE_ADDR addr = 0;
int val = SYMBOL_VALUE (var);
struct frame_info fi;
struct frame_info *fi;
struct type *type = SYMBOL_TYPE (var);
if (frame == 0) frame = selected_frame;
@@ -367,14 +488,12 @@ locate_var_value (var, frame)
addr = find_saved_register (frame, val);
if (addr != 0)
{
union { int i; char c; } test;
int len = TYPE_LENGTH (type);
/* 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))
#ifdef BYTES_BIG_ENDIAN
if (len < REGISTER_RAW_SIZE (val))
/* Big-endian, and we want less than full size. */
addr += REGISTER_RAW_SIZE (val) - len;
#endif
break;
}
error ("Address requested for identifier \"%s\" which is in a register.",
@@ -405,11 +524,6 @@ locate_var_value (var, frame)
}
return value_cast (lookup_pointer_type (type),
value_from_long (builtin_type_long, addr));
value_from_long (builtin_type_long, (LONGEST) addr));
}
static
initialize ()
{}
END_FILE