* tests/gpgscm/opdefines.h: Make tags mandatory.
* tests/gpgscm/scheme.c: Likewise.
* tests/gpgscm/scheme.h: Likewise.
--
Tags provide a constant-time lookup mechanism for almost every object.
This is useful for the interpreter itself, and the code for tags is
tiny.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/init.scm (vm-history-print): New function.
* tests/gpgscm/opdefines.h: New opcodes 'CALLSTACK_POP', 'APPLY_CODE',
and 'VM_HISTORY'.
* tests/gpgscm/scheme-private.h (struct history): New definition.
(struct scheme): New field 'history'.
* tests/gpgscm/scheme.c (gc): Mark objects in the history.
(history_free): New function.
(history_init): Likewise.
(history_mark): Likewise.
(add_mod): New macro.
(sub_mod): Likewise.
(tailstack_clear): New function.
(callstack_pop): Likewise.
(callstack_push): Likewise.
(tailstack_push): Likewise.
(tailstack_flatten): Likewise.
(callstack_flatten): Likewise.
(history_flatten): Likewise.
(opexe_0): New variable 'callsite', keep track of the expression if it
is a call, implement the new opcodes, record function applications in
the history.
(opexe_6): Implement new opcode.
(scheme_init_custom_alloc): Initialize history.
(scheme_deinit): Free history.
* tests/gpgscm/scheme.h (USE_HISTORY): New macro.
--
This patch makes TinySCHEME keep a history of function calls. This
history can be used to produce helpful error messages. The history
data structure is inspired by MIT/GNU Scheme.
Signed-off-by: Justus Winter <justus@g10code.com>
fu history
* tests/gpgscm/opdefines.h: Add opcodes to create and retrieve tags.
* tests/gpgscm/scheme.c (T_TAGGED): New macro.
(mk_tagged_value): New function.
(has_tag): Likewise.
(get_tag): Likewise.
(mark): Mark tag.
(opexe_4): Implement new opcodes.
* tests/gpgscm/scheme.h (USE_TAGS): New macro.
--
Tags are similar to property lists, but property lists can only be
attached to symbols. Tags can not be attached to an existing object,
but a tagged copy can be created. Once done, the tag can be
manipulated in constant time.
Using this during parsing will enable us to produce meaningful error
messages.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct scheme): New fields for the
static integer cells.
* tests/gpgscm/scheme.c (_alloc_cellseg): New function.
(alloc_cellseg): Use the new function.
(MAX_SMALL_INTEGER): New macro.
(initialize_small_integers): New function.
(mk_small_integer): Likewise.
(mk_integer): Return a small integer if possible.
(_s_return): Do not free 'op' if it is a small integer.
(s_save): Use a small integer to box the opcode.
(scheme_init_custom_alloc): Initialize small integers.
(scheme_deinit): Free chunk of small integers.
* tests/gpgscm/scheme.h (USE_SMALL_INTEGERS): New macro.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (s_thread_to): New macro.
(CASE): Likewise.
(opexe_[0-6]): Use 'CASE' instead of 'case' statements, replace
's_goto' with 's_thread_to' where applicable.
--
This is a straight-forward optimization that replaces 's_goto' in
certain cases. Instead of returning to the calling function, and
dispatching the next opcode, we can jump to the opcode handler.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (vtbl): Add 'port_from_file' to the vtable.
* tests/gpgscm/scheme.h (struct scheme_interface): New field
'mk_port_from_file'.
Signed-off-by: Justus Winter <justus@g10code.com>
