#ifndef TRAD_FRAME_H
#define TRAD_FRAME_H
-struct trad_frame
+struct frame_info;
+
+/* A traditional saved regs table, indexed by REGNUM, encoding where
+ the value of REGNUM for the previous frame can be found in this
+ frame.
+
+ The table is initialized with an identity encoding (ADDR == -1,
+ REALREG == REGNUM) indicating that the value of REGNUM in the
+ previous frame can be found in register REGNUM (== REALREG) in this
+ frame.
+
+ The initial encoding can then be changed:
+
+ Modify ADDR (REALREG >= 0, ADDR != -1) to indicate that the value
+ of register REGNUM in the previous frame can be found in memory at
+ ADDR in this frame (addr_p, !realreg_p, !value_p).
+
+ Modify REALREG (REALREG >= 0, ADDR == -1) to indicate that the
+ value of register REGNUM in the previous frame is found in register
+ REALREG in this frame (!addr_p, realreg_p, !value_p).
+
+ Call trad_frame_set_value (REALREG == -1) to indicate that the
+ value of register REGNUM in the previous frame is found in ADDR
+ (!addr_p, !realreg_p, value_p).
+
+ Call trad_frame_set_unknown (REALREG == -2) to indicate that the
+ register's value is not known. */
+
+struct trad_frame_saved_reg
{
- /* If non-zero (and regnum >= 0), the stack address at which the
- register is saved. By default, it is assumed that the register
- was not saved (addr == 0). Remember, a LONGEST can always fit a
- CORE_ADDR. */
- LONGEST addr;
- /* else, if regnum >=0 (and addr == 0), the REGNUM that contains
- this registers value. By default, it is assumed that the
- registers are not moved (the register's value is still in that
- register and regnum == the index). */
- int regnum;
- /* else, if regnum < 0, ADDR is the registers value. */
+ LONGEST addr; /* A CORE_ADDR fits in a longest. */
+ int realreg;
};
-/* Convenience function, encode the register's value in the
- trad-frame. */
-void trad_frame_register_value (struct trad_frame this_saved_regs[],
- int regnum, LONGEST val);
+/* Encode REGNUM value in the trad-frame. */
+void trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum, LONGEST val);
+
+/* Mark REGNUM as unknown. */
+void trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum);
+
+/* Convenience functions, return non-zero if the register has been
+ encoded as specified. */
+int trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum);
+int trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum);
+int trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
+ int regnum);
+
/* Return a freshly allocated (and initialized) trad_frame array. */
-struct trad_frame *trad_frame_alloc_saved_regs (struct frame_info *next_frame);
+struct trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *next_frame);
/* Given the trad_frame info, return the location of the specified
register. */
void trad_frame_prev_register (struct frame_info *next_frame,
- struct trad_frame this_saved_regs[],
+ struct trad_frame_saved_reg this_saved_regs[],
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *bufferp);
+ int *realregp, void *bufferp);
#endif