-/* Copyright (C) 2001, 2009 Free Software Foundation, Inc.
+/* Copyright (C) 2001, 2009, 2010, 2011 Free Software Foundation, Inc.
* *
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* VM frames
*/
+/*
+ * It's a little confusing, but there are two representations of frames in this
+ * file: frame pointers and Scheme objects wrapping those frame pointers. The
+ * former uses the SCM_FRAME_... macro prefix, the latter SCM_VM_FRAME_..
+ * prefix.
+ *
+ * The confusing thing is that only Scheme frame objects have functions that use
+ * them, and they use the scm_frame_.. prefix. Hysterical raisins.
+ */
+
/* VM Frame Layout
---------------
- | | <- fp + bp->nargs + bp->nlocs + 3
- +------------------+ = SCM_FRAME_UPPER_ADDRESS (fp)
- | Return address |
- | MV return address|
- | Dynamic link | <- fp + bp->nargs + bp->blocs
- | Local variable 1 | = SCM_FRAME_DATA_ADDRESS (fp)
- | Local variable 0 | <- fp + bp->nargs
+ | ... |
+ | Intermed. val. 0 | <- fp + nargs + nlocs
+ +------------------+
+ | Local variable 1 |
+ | Local variable 0 | <- fp + nargs
| Argument 1 |
- | Argument 0 | <- fp
+ | Argument 0 | <- fp = SCM_FRAME_STACK_ADDRESS (fp)
| Program | <- fp - 1
- +------------------+ = SCM_FRAME_LOWER_ADDRESS (fp)
+ +==================+
+ | Return address | <- SCM_FRAME_UPPER_ADDRESS (fp)
+ | MV return address|
+ | Dynamic link | <- fp - 4 = SCM_FRAME_DATA_ADDRESS (fp) = SCM_FRAME_LOWER_ADDRESS (fp)
+ +==================+
| |
As can be inferred from this drawing, it is assumed that
`sizeof (SCM *) == sizeof (SCM)', since pointers (the `link' parts) are
assumed to be as long as SCM objects. */
-#define SCM_FRAME_DATA_ADDRESS(fp) \
- (fp + SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp))->nargs \
- + SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp))->nlocs)
-#define SCM_FRAME_UPPER_ADDRESS(fp) (SCM_FRAME_DATA_ADDRESS (fp) + 3)
-#define SCM_FRAME_LOWER_ADDRESS(fp) (fp - 1)
+/* This structure maps to the contents of a VM stack frame. It can
+ alias a frame directly. */
+struct scm_vm_frame
+{
+ SCM *dynamic_link;
+ scm_t_uint8 *mv_return_address;
+ scm_t_uint8 *return_address;
+ SCM program;
+ SCM stack[1]; /* Variable-length */
+};
+
+#define SCM_FRAME_STRUCT(fp) \
+ ((struct scm_vm_frame *) SCM_FRAME_DATA_ADDRESS (fp))
-#define SCM_FRAME_BYTE_CAST(x) ((scm_byte_t *) SCM_UNPACK (x))
+#define SCM_FRAME_DATA_ADDRESS(fp) (((SCM *) (fp)) - 4)
+#define SCM_FRAME_STACK_ADDRESS(fp) (SCM_FRAME_STRUCT (fp)->stack)
+#define SCM_FRAME_UPPER_ADDRESS(fp) ((SCM*)&SCM_FRAME_STRUCT (fp)->return_address)
+#define SCM_FRAME_LOWER_ADDRESS(fp) ((SCM*)SCM_FRAME_STRUCT (fp))
+
+#define SCM_FRAME_BYTE_CAST(x) ((scm_t_uint8 *) SCM_UNPACK (x))
#define SCM_FRAME_STACK_CAST(x) ((SCM *) SCM_UNPACK (x))
-#define SCM_FRAME_RETURN_ADDRESS(fp) \
- (SCM_FRAME_BYTE_CAST (SCM_FRAME_DATA_ADDRESS (fp)[2]))
-#define SCM_FRAME_MV_RETURN_ADDRESS(fp) \
- (SCM_FRAME_BYTE_CAST (SCM_FRAME_DATA_ADDRESS (fp)[1]))
-#define SCM_FRAME_DYNAMIC_LINK(fp) \
- (SCM_FRAME_STACK_CAST (SCM_FRAME_DATA_ADDRESS (fp)[0]))
-#define SCM_FRAME_SET_DYNAMIC_LINK(fp, dl) \
- ((SCM_FRAME_DATA_ADDRESS (fp)[0])) = (SCM)(dl);
-#define SCM_FRAME_VARIABLE(fp,i) fp[i]
-#define SCM_FRAME_PROGRAM(fp) fp[-1]
+#define SCM_FRAME_RETURN_ADDRESS(fp) \
+ (SCM_FRAME_STRUCT (fp)->return_address)
+#define SCM_FRAME_SET_RETURN_ADDRESS(fp, ra) \
+ SCM_FRAME_STRUCT (fp)->return_address = (ra)
+#define SCM_FRAME_MV_RETURN_ADDRESS(fp) \
+ (SCM_FRAME_STRUCT (fp)->mv_return_address)
+#define SCM_FRAME_SET_MV_RETURN_ADDRESS(fp, mvra) \
+ SCM_FRAME_STRUCT (fp)->mv_return_address = (mvra)
+#define SCM_FRAME_DYNAMIC_LINK(fp) \
+ (SCM_FRAME_STRUCT (fp)->dynamic_link)
+#define SCM_FRAME_SET_DYNAMIC_LINK(fp, dl) \
+ SCM_FRAME_DYNAMIC_LINK (fp) = (dl)
+#define SCM_FRAME_VARIABLE(fp,i) \
+ (SCM_FRAME_STRUCT (fp)->stack[i])
+#define SCM_FRAME_PROGRAM(fp) \
+ (SCM_FRAME_STRUCT (fp)->program)
\f
/*
* Heap frames
*/
-SCM_API scm_t_bits scm_tc16_vm_frame;
-
-struct scm_vm_frame
+struct scm_frame
{
SCM stack_holder;
SCM *fp;
SCM *sp;
- scm_byte_t *ip;
+ scm_t_uint8 *ip;
scm_t_ptrdiff offset;
};
-#define SCM_VM_FRAME_P(x) SCM_SMOB_PREDICATE (scm_tc16_vm_frame, x)
-#define SCM_VM_FRAME_DATA(x) ((struct scm_vm_frame*)SCM_SMOB_DATA (x))
+#define SCM_VM_FRAME_P(x) (SCM_NIMP (x) && SCM_TYP7 (x) == scm_tc7_frame)
+#define SCM_VM_FRAME_DATA(x) ((struct scm_frame*)SCM_CELL_WORD_1 (x))
#define SCM_VM_FRAME_STACK_HOLDER(f) SCM_VM_FRAME_DATA(f)->stack_holder
#define SCM_VM_FRAME_FP(f) SCM_VM_FRAME_DATA(f)->fp
#define SCM_VM_FRAME_SP(f) SCM_VM_FRAME_DATA(f)->sp
#define SCM_VM_FRAME_OFFSET(f) SCM_VM_FRAME_DATA(f)->offset
#define SCM_VALIDATE_VM_FRAME(p,x) SCM_MAKE_VALIDATE (p, x, VM_FRAME_P)
-/* FIXME rename scm_byte_t */
-SCM_API SCM scm_c_make_vm_frame (SCM stack_holder, SCM *fp, SCM *sp,
- scm_byte_t *ip, scm_t_ptrdiff offset);
-SCM_API SCM scm_vm_frame_p (SCM obj);
-SCM_API SCM scm_vm_frame_program (SCM frame);
-SCM_API SCM scm_vm_frame_arguments (SCM frame);
-SCM_API SCM scm_vm_frame_source (SCM frame);
-SCM_API SCM scm_vm_frame_local_ref (SCM frame, SCM index);
-SCM_API SCM scm_vm_frame_local_set_x (SCM frame, SCM index, SCM val);
-SCM_API SCM scm_vm_frame_return_address (SCM frame);
-SCM_API SCM scm_vm_frame_mv_return_address (SCM frame);
-SCM_API SCM scm_vm_frame_dynamic_link (SCM frame);
-SCM_API SCM scm_vm_frame_stack (SCM frame);
-
-SCM_API SCM scm_c_vm_frame_prev (SCM frame);
-
-SCM_INTERNAL void scm_bootstrap_frames (void);
+SCM_API SCM scm_c_make_frame (SCM stack_holder, SCM *fp, SCM *sp,
+ scm_t_uint8 *ip, scm_t_ptrdiff offset);
+SCM_API SCM scm_frame_p (SCM obj);
+SCM_API SCM scm_frame_procedure (SCM frame);
+SCM_API SCM scm_frame_arguments (SCM frame);
+SCM_API SCM scm_frame_source (SCM frame);
+SCM_API SCM scm_frame_num_locals (SCM frame);
+SCM_API SCM scm_frame_local_ref (SCM frame, SCM index);
+SCM_API SCM scm_frame_local_set_x (SCM frame, SCM index, SCM val);
+SCM_API SCM scm_frame_address (SCM frame);
+SCM_API SCM scm_frame_stack_pointer (SCM frame);
+SCM_API SCM scm_frame_instruction_pointer (SCM frame);
+SCM_API SCM scm_frame_return_address (SCM frame);
+SCM_API SCM scm_frame_mv_return_address (SCM frame);
+SCM_API SCM scm_frame_dynamic_link (SCM frame);
+SCM_API SCM scm_frame_previous (SCM frame);
+
+SCM_INTERNAL void scm_i_frame_print (SCM frame, SCM port,
+ scm_print_state *pstate);
SCM_INTERNAL void scm_init_frames (void);
#endif /* _SCM_FRAMES_H_ */
HCoop / bpt / guile.git / blobdiff