/* Find a variable's value in memory, for GDB, the GNU debugger.
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003 Free Software
+ 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004 Free Software
Foundation, Inc.
This file is part of GDB.
char raw_buffer[MAX_REGISTER_SIZE];
enum lval_type lval;
- /* User registers lie completly outside of the range of normal
+ /* User registers lie completely outside of the range of normal
registers. Catch them early so that the target never sees them. */
if (regnum >= NUM_REGS + NUM_PSEUDO_REGS)
return value_of_user_reg (regnum, frame);
/* Convert raw data to virtual format if necessary. */
- if (DEPRECATED_REGISTER_CONVERTIBLE (regnum))
- {
- DEPRECATED_REGISTER_CONVERT_TO_VIRTUAL (regnum, register_type (current_gdbarch, regnum),
- raw_buffer, VALUE_CONTENTS_RAW (reg_val));
- }
- else if (DEPRECATED_REGISTER_RAW_SIZE (regnum) == DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum))
+ if (DEPRECATED_REGISTER_RAW_SIZE (regnum) == DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum))
memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
DEPRECATED_REGISTER_RAW_SIZE (regnum));
else
struct value *v = allocate_value (type);
CHECK_TYPEDEF (type);
- if (CONVERT_REGISTER_P (regnum, type))
+ if (TYPE_LENGTH (type) == 0)
+ {
+ /* It doesn't matter much what we return for this: since the
+ length is zero, it could be anything. But if allowed to see
+ a zero-length type, the register-finding loop below will set
+ neither mem_stor nor reg_stor, and then report an internal
+ error.
+
+ Zero-length types can legitimately arise from declarations
+ like 'struct {}' (a GCC extension, not valid ISO C). GDB may
+ also create them when it finds bogus debugging information;
+ for example, in GCC 2.95.4 and binutils 2.11.93.0.2, the
+ STABS BINCL->EXCL compression process can create bad type
+ numbers. GDB reads these as TYPE_CODE_UNDEF types, with zero
+ length. (That bug is actually the only known way to get a
+ zero-length value allocated to a register --- which is what
+ it takes to make it here.)
+
+ We'll just attribute the value to the original register. */
+ VALUE_LVAL (v) = lval_register;
+ VALUE_ADDRESS (v) = regnum;
+ VALUE_REGNO (v) = regnum;
+ }
+ else if (CONVERT_REGISTER_P (regnum, type))
{
/* The ISA/ABI need to something weird when obtaining the
specified value from this register. It might need to