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guile/libguile/foreign.h
Andy Wingo 0007507340 VM stack grows downward 
Adapt VM stack to grow downward.  This will make native compilation look
more like the VM code, as we will be able to use native CALL
instructions, taking proper advantage of the return address buffer.

* libguile/continuations.c (scm_i_continuation_to_frame): Record offsets
  from stack top.

* libguile/control.c (scm_i_prompt_pop_abort_args_x): Adapt for reversed
  order of arguments, and instead of relying on the abort to push on the
  number of arguments, make the caller save the stack depth, which
  allows us to compute the number of arguments ourselves.
  (reify_partial_continuation, scm_c_abort): Adapt to reversed stack
  order.

* libguile/dynstack.c (scm_dynstack_wind_prompt): Since we wind the
  stack in a downward direction, subtract the reloc instead of adding
  it.

* libguile/dynstack.h (SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY): Remove flag;
  instead rely on prompt-establishing code to save the stack depth.

* libguile/eval.c (eval): Remove extraneous "volatile" declarations for
  variables that are not re-set between the setjmp and any longjmp.
  Adapt to save stack depth before instating the prompt.

* libguile/foreign.c (scm_i_foreign_call): Adapt to receive arguments in
  reverse order.

* libguile/frames.c (frame_stack_top, scm_i_frame_stack_top): Adapt to
  compute stack top instead of stack bottom.
  (scm_c_frame_closure): Adapt to stack growth change.
  (scm_frame_num_locals, scm_frame_local_ref, scm_frame_set_x): Use
  union data type to access stack.
  (RELOC): Reformat.
  (scm_c_frame_previous): Adapt to stack growth change.

* libguile/frames.h: Adapt stack diagram to indicate that the stack
  grows up.
  (union scm_vm_stack_element): New data type used to access items on
  the stack.
  (SCM_FRAME_PREVIOUS_SP)
  (SCM_FRAME_RETURN_ADDRESS, SCM_FRAME_SET_RETURN_ADDRESS)
  (SCM_FRAME_DYNAMIC_LINK, SCM_FRAME_SET_DYNAMIC_LINK)
  (SCM_FRAME_LOCAL, SCM_FRAME_NUM_LOCALS): Adapt to stack representation
  change.
  (SCM_FRAME_SLOT): New helper.
  (SCM_VM_FRAME_FP, SCM_VM_FRAME_SP): Adapt to stack growth change.

* libguile/stacks.c (scm_make_stack): Record offsets from top of stack.

* libguile/throw.c (catch): Adapt to scm_i_prompt_pop_abort_args_x
  change.

* libguile/vm-engine.c (ALLOC_FRAME, RESET_FRAME):
  (FRAME_LOCALS_COUNT_FROM): Adapt to stack growth change.
  (LOCAL_ADDRESS): Use SCM_FRAME_SLOT to get the address as the proper
  data type.
  (RETURN_ONE_VALUE, RETURN_VALUE_LIST): Adapt to stack growth change.
  (apply): Shuffling up the SMOB apply args can cause the stack to
  expand, so use ALLOC_FRAME instead of RESET_FRAME.
  (vm_engine): Adapt for stack growth change.

* libguile/vm.c (vm_increase_sp, vm_push_sp, vm_restore_sp): Adapt to
  stack representation change.
  (scm_i_vm_cont_to_frame): Adapt to take offsets from the top.
  (scm_i_vm_capture_stack): Adapt to capture from the top.
  (vm_return_to_continuation_inner): Adapt for data type changes.
  (vm_return_to_continuation): Likewise, and instead of looping, just
  splat the saved arguments on with memcpy.
  (vm_dispatch_hook): Adapt to receive arguments in the reverse order.
  Adapt callers.
  (vm_abort): There is never a tail argument.  Adapt to stack
  representation change.
  (vm_reinstate_partial_continuation)
  (vm_reinstate_partial_continuation_inner): Adapt to stack growth
  change.
  (allocate_stack, free_stack): Adapt to data type change.
  (expand_stack): Don't try to mremap(), as you can't grow a mapping
  from the bottom.  Without knowing that there's a free mapping space
  right below the old stack, which there usually isn't on Linux, we have
  to copy.  We can't use MAP_GROWSDOWN because Linux is buggy.
  (make_vm): Adapt to stack representation changes.
  (return_unused_stack_to_os): Round down instead of up, as the stack
  grows down.
  (scm_i_vm_mark_stack): Adapt to walk up the stack.
  (scm_i_vm_free_stack): Adapt to scm_vm changes.
  (vm_expand_stack_inner, reset_stack_limit, vm_expand_stack): Adapt to
  the stack growing down.
  (scm_call_n): Adapt to the stack growing down.  Don't allow argv to
  point into the stack.

* libguile/vm.h (struct scm_vm, struct scm_vm_cont): Adapt to hold the
  stack top and bottom.
2015-10-21 11:49:20 +02:00

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#ifndef SCM_FOREIGN_H
#define SCM_FOREIGN_H
/* Copyright (C) 2010, 2011, 2012, 2013 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
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "libguile/__scm.h"
/* A "foreign pointer" is a wrapped C pointer. It is represented by a
cell whose second word is a pointer. The first word has the
`scm_tc7_pointer' type code.
The basic idea is that we can help the programmer to avoid cutting herself,
but we won't take away her knives. */
enum scm_t_foreign_type
{
SCM_FOREIGN_TYPE_VOID,
SCM_FOREIGN_TYPE_FLOAT,
SCM_FOREIGN_TYPE_DOUBLE,
SCM_FOREIGN_TYPE_UINT8,
SCM_FOREIGN_TYPE_INT8,
SCM_FOREIGN_TYPE_UINT16,
SCM_FOREIGN_TYPE_INT16,
SCM_FOREIGN_TYPE_UINT32,
SCM_FOREIGN_TYPE_INT32,
SCM_FOREIGN_TYPE_UINT64,
SCM_FOREIGN_TYPE_INT64,
SCM_FOREIGN_TYPE_LAST = SCM_FOREIGN_TYPE_INT64
};
typedef enum scm_t_foreign_type scm_t_foreign_type;
typedef void (*scm_t_pointer_finalizer) (void *);
#define SCM_POINTER_P(x) (SCM_HAS_TYP7 (x, scm_tc7_pointer))
#define SCM_VALIDATE_POINTER(pos, x) \
SCM_MAKE_VALIDATE (pos, x, POINTER_P)
#define SCM_POINTER_VALUE(x) \
((void *) SCM_CELL_WORD_1 (x))
SCM_API void *scm_to_pointer (SCM pointer);
SCM_API SCM scm_from_pointer (void *, scm_t_pointer_finalizer);
SCM_API SCM scm_alignof (SCM type);
SCM_API SCM scm_sizeof (SCM type);
SCM_API SCM scm_pointer_address (SCM pointer);
SCM_API SCM scm_pointer_to_scm (SCM pointer);
SCM_API SCM scm_scm_to_pointer (SCM scm);
SCM_API SCM scm_pointer_to_bytevector (SCM pointer, SCM type,
SCM offset, SCM len);
SCM_API SCM scm_set_pointer_finalizer_x (SCM pointer, SCM finalizer);
SCM_API SCM scm_bytevector_to_pointer (SCM bv, SCM offset);
SCM_INTERNAL SCM scm_pointer_p (SCM obj);
SCM_INTERNAL SCM scm_make_pointer (SCM address, SCM finalizer);
SCM_INTERNAL void scm_i_pointer_print (SCM pointer, SCM port,
scm_print_state *pstate);
SCM_INTERNAL SCM scm_dereference_pointer (SCM pointer);
SCM_INTERNAL SCM scm_string_to_pointer (SCM string, SCM encoding);
SCM_INTERNAL SCM scm_pointer_to_string (SCM pointer, SCM length, SCM encoding);
/* Foreign functions */
/* The goal is to make it so that calling a foreign function doesn't cause any
heap allocation. That means we need native Scheme formats for all kinds of
arguments.
For "value" types like s64 or f32, we just use native Scheme value types.
(Note that in both these cases, allocation is possible / likely, as the
value might need to be boxed, but perhaps we won't worry about that. Hmm.)
For everything else, we use foreign pointers. This includes arrays, pointer
arguments and return vals, struct args and return vals, and out and in/out
arguments.
*/
union scm_vm_stack_element;
SCM_API SCM scm_pointer_to_procedure (SCM return_type, SCM func_ptr,
SCM arg_types);
SCM_API SCM scm_procedure_to_pointer (SCM return_type, SCM func_ptr,
SCM arg_types);
SCM_INTERNAL SCM scm_i_foreign_call (SCM foreign,
const union scm_vm_stack_element *argv);
SCM_INTERNAL int scm_i_foreign_arity (SCM foreign,
int *req, int *opt, int *rest);
SCM_INTERNAL void scm_register_foreign (void);
#endif /* SCM_FOREIGN_H */
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