* tests/gpgscm/scheme.c: Define local strlwr only when HAVE_STRLWR is
not defined in config.h.
* tests/gpgscm/scheme-config.h: Remove hack.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (port_increment_current_line): Avoid creating
the same integer if the delta is zero. This happens a lot during
parsing, and puts pressure on the memory allocator.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (opexe_5): Only increment the line number on
newlines.
Fixes-commit: 7cc57e2c63
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct port): Move location
information out of the union.
* tests/gpgscm/scheme.c (mark): All ports need marking now.
(gc): Likewise all ports on the load stack.
(port_clear_location): Adapt accordingly. Also, add an empty function
for !SHOW_ERROR_LINE.
(port_increment_current_line): Likewise.
(port_reset_current_line): Drop function in favor of...
(port_init_location): ... this new function.
(file_push): Simplify.
(file_pop): Likewise.
(port_rep_from_filename): Likewise.
(port_rep_from_file): Likewise.
(port_rep_from_string): Also initialize the location.
(port_rep_from_scratch): Likewise.
(port_close): Simplify and generalize.
(skipspace): Likewise.
(token): Likewise.
(_Error_1): Generalize.
(opexe_5): Likewise.
(scheme_deinit): Simplify and generalize.
(scheme_load_named_file): Likewise.
(scheme_load_string): Also initialize the location.
--
This change tracks the location of source code loaded from non-file
ports that is used in error messages. It also simplifies the code
quite a bit.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (oblist_initial_value): Increase the size of
the hash table based on the number of symbols used after initializing
the interpreter.
(new_frame_in_env): Increase the size of the hash table based on the
number of variables in the global environement.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (pointercmp): New function.
(new_slot_spec_in_env): Add and use slot for insertions.
(find_slot_spec_in_env): New variant of 'find_slot_in_env' that
returns the slot on failures.
(find_slot_in_env): Express using the new function.
(new_slot_in_env): Update callsite.
(opexe_0): Optimize lookup-or-insert.
(opexe_1): Likewise.
(scheme_define): Likewise.
--
Optimize environment lookups by keeping the lists in the hash table or
the list sorted. Optimize the insertions by passing the slot computed
by the lookup to the insertion.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (oblist_find_by_name): Keep the list of
symbols sorted, return the slot where a new symbol must be inserted on
lookup failures.
(oblist_add_by_name): Add the new symbol at the given slot.
(mk_symbol): Adjust callsite.
(gensym): Likewise.
(assign_syntax): Likewise.
--
Optimize symbol lookups by keeping the lists in the hash table (or the
list if compiled with USE_OBJECT_LIST) sorted by the symbol names.
Optimize the insertions by passing the slot computed by the lookup to
the insertion.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct cell): Add a compact vector
representation.
* tests/gpgscm/scheme.c (vector_length): Use new representation.
(vector_size): New macro.
(get_vector_object): Use the new representation.
(fill_vector): Likewise.
(vector_elem): Likewise.
(set_vector_elem): Likewise.
(mark): Likewise.
(gc): Likewise. Be careful not to confuse immediate values for type
flags.
(finalize_cell): Vectors now require finalization.
--
Previously, vectors were represented using consecutive cons cells,
wasting one word per cell for the type information. Fix that by using
a flat array.
Previously, a vector of size N required 1 + (n + 1) / 2 cells. Now it
uses 1 + (n - 1 + 2) / 3 cells.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (IMMEDIATE_TAG): New macro.
({is,set,clr}_immediate): Likewise.
(enum scheme_types): Make type tags disjoint from immediate values.
(TYPE_BITS): We need one more bit now.
(ADJ,T_MASKTYPE): Compute values.
--
Immediate values are disjoint from all type tags and pointers,
allowing us to store immediate values in all memory locations.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (vector_length): New macro.
(get_vector_object): Use the new macro.
(oblist_add_by_name): Likewise.
(oblist_find_by_name): Likewise.
(oblist_all_symbols): Likewise.
(mk_vector): Likewise.
(mark): Likewise.
(new_slot_spec_in_env): Likewise.
(find_slot_spec_in_env): Likewise.
(opexe_2): Likewise.
(opexe_5): Likewise.
--
Introducing an abstraction reduces the coupling between code using
vectors and the implementation of vectors.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct port): Use boxed values for
filename and current line. This allows us to use the same Scheme
object for labeling all expressions in a file.
* tests/gpgscm/scheme.c (file_push): Use boxed type for filename.
(mark): Mark location objects of port objects.
(gc): Mark location objects in the load stack.
(port_clear_location): New function.
(port_reset_current_line): Likewise.
(port_increment_current_line): Likewise.
(file_pop): Adapt accordingly.
(port_rep_from_filename): Likewise.
(port_rep_from_file): Likewise.
(port_close): Likewise.
(skipspace): Likewise.
(token): Likewise.
(_Error_1): Likewise.
(opexe_0): Likewise.
(opexe_5): Likewise.
(scheme_deinit): Likewise.
(scheme_load_file): Likewise.
(scheme_load_named_file): Likewise.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (opexe_5): Check that we have a file port
before accessing filename. Fixes a crash on 32-bit architectures.
Fixes-commit: e7429b1ced
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (mk_atom): Change associativity of the ::
infix-operator. This makes it possible to naturally express accessing
nested structures (e.g. a:🅱️:c).
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/ffi.scm: Move the customized exception handling and
atexit logic...
* tests/gpgscm/init.scm: ... here.
(throw): Record the current history.
(throw'): New function that is history-aware.
(rethrow): New function.
(*error-hook*): Use the new throw'.
* tests/gpgscm/main.c (load): Fix error handling.
(main): Save and use the 'sc->retcode' as exit code.
* tests/gpgscm/repl.scm (repl): Print call history.
* tests/gpgscm/scheme.c (_Error_1): Make a snapshot of the history,
use it to provide a accurate location of the expression causing the
error at runtime, and hand the history trace to the '*error-hook*'.
(opexe_5): Tag all lists at parse time with the current location.
* tests/gpgscm/tests.scm: Update calls to 'throw', use 'rethrow'.
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/scheme.c (S_FLAG_TAIL_CONTEXT): New macro. This flag
indicates that the interpreter is evaluating an expression in a tail
context (see R5RS, section 3.5).
(opexe_0): Clear and set the flag according to the rules layed out in
R5RS, section 3.5.
(opexe_1): Likewise.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct scheme): Add field 'flags'.
* tests/gpgscm/scheme.c (S_OP_MASK): New macro.
(S_FLAG_MASK, s_set_flag, s_clear_flag, s_get_flag): Likewise.
(_s_return): Unpack the encoded opcode and flags.
(s_save): Encode the flags along with the opcode. Use normal
integers to encode the result.
(scheme_init_custom_alloc): Initialize 'op' and 'flags'.
Signed-off-by: Justus Winter <justus@g10code.com>
* 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/opdefines.h (put, get): Check arguments. Also rename
to 'set-symbol-property' and 'symbol-property', the names used by
Guile, because put and get are too unspecific.
* tests/gpgscm/scheme.c (hasprop): Only symbols have property lists.
(get_property): New function.
(set_property): Likewise.
(opexe_4): Use the new functions.
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 (T_FINALIZE): New macro.
(mk_port): Use the new macro.
(mk_foreign_object): Likewise.
(mk_counted_string): Likewise.
(mk_empty_string): Likewise.
(gc): Only call 'finalize_cell' for cells with the new flag.
--
This speeds up the sweep phase of the garbage collector considerably
because most cells do not require finalization.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct scheme): New fields
'inhibit_gc', 'reserved_cells', and 'reserved_lineno'.
* tests/gpgscm/scheme.c (GC_ENABLED): New macro.
(USE_GC_LOCKING): Likewise.
(gc_reservations): Likewise.
(gc_reservation_failure): New function.
(_gc_disable): Likewise.
(gc_disable): New macro.
(gc_enable): Likewise.
(gc_enabled): Likewise.
(gc_consume): Likewise.
(get_cell_x): Consume reserved cell if garbage collection is disabled.
(_get_cell): Assert that gc is enabled.
(get_cell): Only record cell in the list of recently allocated cells
if gc is enabled.
(get_vector_object): Likewise.
(gc): Assert that gc is enabled.
(s_return): Add comment, adjust call to '_s_return'.
(s_return_enable_gc): New macro.
(_s_return): Add flag 'enable_gc' and re-enable gc if set.
(oblist_add_by_name): Use the new facilities to protect the
allocations.
(new_frame_in_env): Likewise.
(new_slot_spec_in_env): Likewise.
(s_save): Likewise.
(opexe_0): Likewise.
(opexe_1): Likewise.
(opexe_2): Likewise.
(opexe_5): Likewise.
(opexe_6): Likewise.
(scheme_init_custom_alloc): Initialize the new fields.
--
Every time a cell is allocated, the interpreter may run out of free
cells and do a garbage collection. This is problematic because it
might garbage collect objects that have been allocated, but are not
yet made available to the interpreter.
Previously, we would plug such newly allocated cells into the list of
newly allocated objects rooted at car(sc->sink), but that requires
allocating yet another cell increasing pressure on the memory
management system.
A faster alternative is to preallocate the cells needed for an
operation and make sure the garbage collection is not run until all
allocated objects are plugged in. This can be done with gc_disable
and gc_enable.
This optimization can be applied incrementally. This commit picks all
low-hanging fruits.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme.c (free_cell): New function.
(free_cons): Likewise.
(_s_return): Use the new function to recover cells used to save the
state of the interpreter in 's_save'. This reduces the need to do a
garbage collection considerably.
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 (atom2str): Fix computing the length of Scheme
strings. Scheme strings can contain zero bytes.
Signed-off-by: Justus Winter <justus@g10code.com>
* tests/gpgscm/scheme-private.h (struct scheme): Use (void *) for
alloc_seg.
* tests/gpgscm/scheme.c (alloc_cellseg): Use (void *) for cp. Use
(void *) for coercion of address calculation.
--
In old C language, (char *) means an address. In modern C, it's
specifically an address with alignment=1. It's good to use (void *) for
an address, because newer compiler emits warnings. Note: in this
particular case, it is just a warning and the code is safe against
invalid alignment, though.
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
* tests/gpgscm/scheme.c (opexe_0): Include names of missing function
parameters in the error message.
Signed-off-by: Justus Winter <justus@g10code.com>
