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corelib.c
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corelib.c
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/*
* Copyright (c) 2023 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include <math.h>
#include "compile.h"
#include "state.h"
#include "util.h"
#endif
/* Generated bytes */
#ifndef JANET_BOOTSTRAP
extern const unsigned char *janet_core_image;
extern size_t janet_core_image_size;
#endif
/* Docstrings should only exist during bootstrap */
#ifdef JANET_BOOTSTRAP
#define JDOC(x) (x)
#else
#define JDOC(x) NULL
#endif
JanetModule janet_native(const char *name, const uint8_t **error) {
janet_sandbox_assert(JANET_SANDBOX_DYNAMIC_MODULES);
char *processed_name = get_processed_name(name);
Clib lib = load_clib(processed_name);
JanetModule init;
JanetModconf getter;
if (name != processed_name) janet_free(processed_name);
if (!lib) {
*error = janet_cstring(error_clib());
return NULL;
}
init = (JanetModule) symbol_clib(lib, "_janet_init");
if (!init) {
*error = janet_cstring("could not find the _janet_init symbol");
return NULL;
}
getter = (JanetModconf) symbol_clib(lib, "_janet_mod_config");
if (!getter) {
*error = janet_cstring("could not find the _janet_mod_config symbol");
return NULL;
}
JanetBuildConfig modconf = getter();
JanetBuildConfig host = janet_config_current();
if (host.major != modconf.major ||
host.minor < modconf.minor ||
host.bits != modconf.bits) {
char errbuf[128];
sprintf(errbuf, "config mismatch - host %d.%.d.%d(%.4x) vs. module %d.%d.%d(%.4x)",
host.major,
host.minor,
host.patch,
host.bits,
modconf.major,
modconf.minor,
modconf.patch,
modconf.bits);
*error = janet_cstring(errbuf);
return NULL;
}
return init;
}
static const char *janet_dyncstring(const char *name, const char *dflt) {
Janet x = janet_dyn(name);
if (janet_checktype(x, JANET_NIL)) return dflt;
if (!janet_checktype(x, JANET_STRING)) {
janet_panicf("expected string, got %v", x);
}
const uint8_t *jstr = janet_unwrap_string(x);
const char *cstr = (const char *)jstr;
if (strlen(cstr) != (size_t) janet_string_length(jstr)) {
janet_panicf("string %v contains embedded 0s", x);
}
return cstr;
}
static int is_path_sep(char c) {
#ifdef JANET_WINDOWS
if (c == '\\') return 1;
#endif
return c == '/';
}
/* Used for module system. */
JANET_CORE_FN(janet_core_expand_path,
"(module/expand-path path template)",
"Expands a path template as found in `module/paths` for `module/find`. "
"This takes in a path (the argument to require) and a template string, "
"to expand the path to a path that can be used for importing files. "
"The replacements are as follows:\n\n"
"* :all: -- the value of path verbatim.\n\n"
"* :@all: -- Same as :all:, but if `path` starts with the @ character, "
"the first path segment is replaced with a dynamic binding "
"`(dyn <first path segment as keyword>)`.\n\n"
"* :cur: -- the directory portion, if any, of (dyn :current-file)\n\n"
"* :dir: -- the directory portion, if any, of the path argument\n\n"
"* :name: -- the name component of path, with extension if given\n\n"
"* :native: -- the extension used to load natives, .so or .dll\n\n"
"* :sys: -- the system path, or (dyn :syspath)") {
janet_fixarity(argc, 2);
const char *input = janet_getcstring(argv, 0);
const char *template = janet_getcstring(argv, 1);
const char *curfile = janet_dyncstring("current-file", "");
const char *syspath = janet_dyncstring("syspath", "");
JanetBuffer *out = janet_buffer(0);
size_t tlen = strlen(template);
/* Calculate name */
const char *name = input + strlen(input);
while (name > input) {
if (is_path_sep(*(name - 1))) break;
name--;
}
/* Calculate dirpath from current file */
const char *curname = curfile + strlen(curfile);
while (curname > curfile) {
if (is_path_sep(*curname)) break;
curname--;
}
const char *curdir;
int32_t curlen;
if (curname == curfile) {
/* Current file has one or zero path segments, so
* we are in the . directory. */
curdir = ".";
curlen = 1;
} else {
/* Current file has 2 or more segments, so we
* can cut off the last segment. */
curdir = curfile;
curlen = (int32_t)(curname - curfile);
}
for (size_t i = 0; i < tlen; i++) {
if (template[i] == ':') {
if (strncmp(template + i, ":all:", 5) == 0) {
janet_buffer_push_cstring(out, input);
i += 4;
} else if (strncmp(template + i, ":@all:", 6) == 0) {
if (input[0] == '@') {
const char *p = input;
while (*p && !is_path_sep(*p)) p++;
size_t len = p - input - 1;
char *str = janet_smalloc(len + 1);
memcpy(str, input + 1, len);
str[len] = '\0';
janet_formatb(out, "%V", janet_dyn(str));
janet_sfree(str);
janet_buffer_push_cstring(out, p);
} else {
janet_buffer_push_cstring(out, input);
}
i += 5;
} else if (strncmp(template + i, ":cur:", 5) == 0) {
janet_buffer_push_bytes(out, (const uint8_t *)curdir, curlen);
i += 4;
} else if (strncmp(template + i, ":dir:", 5) == 0) {
janet_buffer_push_bytes(out, (const uint8_t *)input,
(int32_t)(name - input));
i += 4;
} else if (strncmp(template + i, ":sys:", 5) == 0) {
janet_buffer_push_cstring(out, syspath);
i += 4;
} else if (strncmp(template + i, ":name:", 6) == 0) {
janet_buffer_push_cstring(out, name);
i += 5;
} else if (strncmp(template + i, ":native:", 8) == 0) {
#ifdef JANET_WINDOWS
janet_buffer_push_cstring(out, ".dll");
#else
janet_buffer_push_cstring(out, ".so");
#endif
i += 7;
} else {
janet_buffer_push_u8(out, (uint8_t) template[i]);
}
} else {
janet_buffer_push_u8(out, (uint8_t) template[i]);
}
}
/* Normalize */
uint8_t *scan = out->data;
uint8_t *print = scan;
uint8_t *scanend = scan + out->count;
int normal_section_count = 0;
int dot_count = 0;
while (scan < scanend) {
if (*scan == '.') {
if (dot_count >= 0) {
dot_count++;
} else {
*print++ = '.';
}
} else if (is_path_sep(*scan)) {
if (dot_count == 1) {
;
} else if (dot_count == 2) {
if (normal_section_count > 0) {
/* unprint last separator */
print--;
/* unprint last section */
while (print > out->data && !is_path_sep(*(print - 1)))
print--;
normal_section_count--;
} else {
*print++ = '.';
*print++ = '.';
*print++ = '/';
}
} else if (scan == out->data || dot_count != 0) {
while (dot_count > 0) {
--dot_count;
*print++ = '.';
}
if (scan > out->data) {
normal_section_count++;
}
*print++ = '/';
}
dot_count = 0;
} else {
while (dot_count > 0) {
--dot_count;
*print++ = '.';
}
dot_count = -1;
*print++ = *scan;
}
scan++;
}
out->count = (int32_t)(print - out->data);
return janet_wrap_buffer(out);
}
JANET_CORE_FN(janet_core_dyn,
"(dyn key &opt default)",
"Get a dynamic binding. Returns the default value (or nil) if no binding found.") {
janet_arity(argc, 1, 2);
Janet value;
if (janet_vm.fiber->env) {
value = janet_table_get(janet_vm.fiber->env, argv[0]);
} else {
value = janet_wrap_nil();
}
if (argc == 2 && janet_checktype(value, JANET_NIL)) {
return argv[1];
}
return value;
}
JANET_CORE_FN(janet_core_setdyn,
"(setdyn key value)",
"Set a dynamic binding. Returns value.") {
janet_fixarity(argc, 2);
if (!janet_vm.fiber->env) {
janet_vm.fiber->env = janet_table(2);
}
janet_table_put(janet_vm.fiber->env, argv[0], argv[1]);
return argv[1];
}
JANET_CORE_FN(janet_core_native,
"(native path &opt env)",
"Load a native module from the given path. The path "
"must be an absolute or relative path on the file system, and is "
"usually a .so file on Unix systems, and a .dll file on Windows. "
"Returns an environment table that contains functions and other values "
"from the native module.") {
JanetModule init;
janet_arity(argc, 1, 2);
const uint8_t *path = janet_getstring(argv, 0);
const uint8_t *error = NULL;
JanetTable *env;
if (argc == 2) {
env = janet_gettable(argv, 1);
} else {
env = janet_table(0);
}
init = janet_native((const char *)path, &error);
if (!init) {
janet_panicf("could not load native %S: %S", path, error);
}
init(env);
janet_table_put(env, janet_ckeywordv("native"), argv[0]);
return janet_wrap_table(env);
}
JANET_CORE_FN(janet_core_describe,
"(describe x)",
"Returns a string that is a human-readable description of `x`. "
"For recursive data structures, the string returned contains a "
"pointer value from which the identity of `x` "
"can be determined.") {
JanetBuffer *b = janet_buffer(0);
for (int32_t i = 0; i < argc; ++i)
janet_description_b(b, argv[i]);
return janet_stringv(b->data, b->count);
}
JANET_CORE_FN(janet_core_string,
"(string & xs)",
"Creates a string by concatenating the elements of `xs` together. If an "
"element is not a byte sequence, it is converted to bytes via `describe`. "
"Returns the new string.") {
JanetBuffer *b = janet_buffer(0);
for (int32_t i = 0; i < argc; ++i)
janet_to_string_b(b, argv[i]);
return janet_stringv(b->data, b->count);
}
JANET_CORE_FN(janet_core_symbol,
"(symbol & xs)",
"Creates a symbol by concatenating the elements of `xs` together. If an "
"element is not a byte sequence, it is converted to bytes via `describe`. "
"Returns the new symbol.") {
JanetBuffer *b = janet_buffer(0);
for (int32_t i = 0; i < argc; ++i)
janet_to_string_b(b, argv[i]);
return janet_symbolv(b->data, b->count);
}
JANET_CORE_FN(janet_core_keyword,
"(keyword & xs)",
"Creates a keyword by concatenating the elements of `xs` together. If an "
"element is not a byte sequence, it is converted to bytes via `describe`. "
"Returns the new keyword.") {
JanetBuffer *b = janet_buffer(0);
for (int32_t i = 0; i < argc; ++i)
janet_to_string_b(b, argv[i]);
return janet_keywordv(b->data, b->count);
}
JANET_CORE_FN(janet_core_buffer,
"(buffer & xs)",
"Creates a buffer by concatenating the elements of `xs` together. If an "
"element is not a byte sequence, it is converted to bytes via `describe`. "
"Returns the new buffer.") {
JanetBuffer *b = janet_buffer(0);
for (int32_t i = 0; i < argc; ++i)
janet_to_string_b(b, argv[i]);
return janet_wrap_buffer(b);
}
JANET_CORE_FN(janet_core_is_abstract,
"(abstract? x)",
"Check if x is an abstract type.") {
janet_fixarity(argc, 1);
return janet_wrap_boolean(janet_checktype(argv[0], JANET_ABSTRACT));
}
JANET_CORE_FN(janet_core_scannumber,
"(scan-number str &opt base)",
"Parse a number from a byte sequence and return that number, either an integer "
"or a real. The number "
"must be in the same format as numbers in janet source code. Will return nil "
"on an invalid number. Optionally provide a base - if a base is provided, no "
"radix specifier is expected at the beginning of the number.") {
double number;
janet_arity(argc, 1, 2);
JanetByteView view = janet_getbytes(argv, 0);
int32_t base = janet_optinteger(argv, argc, 1, 0);
int valid = base == 0 || (base >= 2 && base <= 36);
if (!valid) {
janet_panicf("expected base between 2 and 36, got %d", base);
}
if (janet_scan_number_base(view.bytes, view.len, base, &number))
return janet_wrap_nil();
return janet_wrap_number(number);
}
JANET_CORE_FN(janet_core_tuple,
"(tuple & items)",
"Creates a new tuple that contains items. Returns the new tuple.") {
return janet_wrap_tuple(janet_tuple_n(argv, argc));
}
JANET_CORE_FN(janet_core_array,
"(array & items)",
"Create a new array that contains items. Returns the new array.") {
JanetArray *array = janet_array(argc);
array->count = argc;
safe_memcpy(array->data, argv, argc * sizeof(Janet));
return janet_wrap_array(array);
}
JANET_CORE_FN(janet_core_slice,
"(slice x &opt start end)",
"Extract a sub-range of an indexed data structure or byte sequence.") {
JanetRange range;
JanetByteView bview;
JanetView iview;
if (janet_bytes_view(argv[0], &bview.bytes, &bview.len)) {
range = janet_getslice(argc, argv);
return janet_stringv(bview.bytes + range.start, range.end - range.start);
} else if (janet_indexed_view(argv[0], &iview.items, &iview.len)) {
range = janet_getslice(argc, argv);
return janet_wrap_tuple(janet_tuple_n(iview.items + range.start, range.end - range.start));
} else {
janet_panic_type(argv[0], 0, JANET_TFLAG_BYTES | JANET_TFLAG_INDEXED);
}
}
JANET_CORE_FN(janet_core_range,
"(range & args)",
"Create an array of values [start, end) with a given step. "
"With one argument, returns a range [0, end). With two arguments, returns "
"a range [start, end). With three, returns a range with optional step size.") {
janet_arity(argc, 1, 3);
int32_t start = 0, stop = 0, step = 1, count = 0;
if (argc == 3) {
start = janet_getinteger(argv, 0);
stop = janet_getinteger(argv, 1);
step = janet_getinteger(argv, 2);
count = (step > 0) ? (stop - start - 1) / step + 1 :
((step < 0) ? (stop - start + 1) / step + 1 : 0);
} else if (argc == 2) {
start = janet_getinteger(argv, 0);
stop = janet_getinteger(argv, 1);
count = stop - start;
} else {
stop = janet_getinteger(argv, 0);
count = stop;
}
count = (count > 0) ? count : 0;
JanetArray *array = janet_array(count);
for (int32_t i = 0; i < count; i++) {
array->data[i] = janet_wrap_number(start + i * step);
}
array->count = count;
return janet_wrap_array(array);
}
JANET_CORE_FN(janet_core_table,
"(table & kvs)",
"Creates a new table from a variadic number of keys and values. "
"kvs is a sequence k1, v1, k2, v2, k3, v3, ... If kvs has "
"an odd number of elements, an error will be thrown. Returns the "
"new table.") {
int32_t i;
if (argc & 1)
janet_panic("expected even number of arguments");
JanetTable *table = janet_table(argc >> 1);
for (i = 0; i < argc; i += 2) {
janet_table_put(table, argv[i], argv[i + 1]);
}
return janet_wrap_table(table);
}
JANET_CORE_FN(janet_core_getproto,
"(getproto x)",
"Get the prototype of a table or struct. Will return nil if `x` has no prototype.") {
janet_fixarity(argc, 1);
if (janet_checktype(argv[0], JANET_TABLE)) {
JanetTable *t = janet_unwrap_table(argv[0]);
return t->proto
? janet_wrap_table(t->proto)
: janet_wrap_nil();
}
if (janet_checktype(argv[0], JANET_STRUCT)) {
JanetStruct st = janet_unwrap_struct(argv[0]);
return janet_struct_proto(st)
? janet_wrap_struct(janet_struct_proto(st))
: janet_wrap_nil();
}
janet_panicf("expected struct or table, got %v", argv[0]);
}
JANET_CORE_FN(janet_core_struct,
"(struct & kvs)",
"Create a new struct from a sequence of key value pairs. "
"kvs is a sequence k1, v1, k2, v2, k3, v3, ... If kvs has "
"an odd number of elements, an error will be thrown. Returns the "
"new struct.") {
int32_t i;
if (argc & 1) {
janet_panic("expected even number of arguments");
}
JanetKV *st = janet_struct_begin(argc >> 1);
for (i = 0; i < argc; i += 2) {
janet_struct_put(st, argv[i], argv[i + 1]);
}
return janet_wrap_struct(janet_struct_end(st));
}
JANET_CORE_FN(janet_core_gensym,
"(gensym)",
"Returns a new symbol that is unique across the runtime. This means it "
"will not collide with any already created symbols during compilation, so "
"it can be used in macros to generate automatic bindings.") {
(void) argv;
janet_fixarity(argc, 0);
return janet_wrap_symbol(janet_symbol_gen());
}
JANET_CORE_FN(janet_core_gccollect,
"(gccollect)",
"Run garbage collection. You should probably not call this manually.") {
(void) argv;
(void) argc;
janet_collect();
return janet_wrap_nil();
}
JANET_CORE_FN(janet_core_gcsetinterval,
"(gcsetinterval interval)",
"Set an integer number of bytes to allocate before running garbage collection. "
"Low values for interval will be slower but use less memory. "
"High values will be faster but use more memory.") {
janet_fixarity(argc, 1);
size_t s = janet_getsize(argv, 0);
/* limit interval to 48 bits */
#ifdef JANET_64
if (s >> 48) {
janet_panic("interval too large");
}
#endif
janet_vm.gc_interval = s;
return janet_wrap_nil();
}
JANET_CORE_FN(janet_core_gcinterval,
"(gcinterval)",
"Returns the integer number of bytes to allocate before running an iteration "
"of garbage collection.") {
(void) argv;
janet_fixarity(argc, 0);
return janet_wrap_number((double) janet_vm.gc_interval);
}
JANET_CORE_FN(janet_core_type,
"(type x)",
"Returns the type of `x` as a keyword. `x` is one of:\n\n"
"* :nil\n\n"
"* :boolean\n\n"
"* :number\n\n"
"* :array\n\n"
"* :tuple\n\n"
"* :table\n\n"
"* :struct\n\n"
"* :string\n\n"
"* :buffer\n\n"
"* :symbol\n\n"
"* :keyword\n\n"
"* :function\n\n"
"* :cfunction\n\n"
"* :fiber\n\n"
"or another keyword for an abstract type.") {
janet_fixarity(argc, 1);
JanetType t = janet_type(argv[0]);
if (t == JANET_ABSTRACT) {
return janet_ckeywordv(janet_abstract_type(janet_unwrap_abstract(argv[0]))->name);
} else {
return janet_ckeywordv(janet_type_names[t]);
}
}
JANET_CORE_FN(janet_core_hash,
"(hash value)",
"Gets a hash for any value. The hash is an integer can be used "
"as a cheap hash function for all values. If two values are strictly equal, "
"then they will have the same hash value.") {
janet_fixarity(argc, 1);
return janet_wrap_number(janet_hash(argv[0]));
}
JANET_CORE_FN(janet_core_getline,
"(getline &opt prompt buf env)",
"Reads a line of input into a buffer, including the newline character, using a prompt. "
"An optional environment table can be provided for auto-complete. "
"Returns the modified buffer. "
"Use this function to implement a simple interface for a terminal program.") {
FILE *in = janet_dynfile("in", stdin);
FILE *out = janet_dynfile("out", stdout);
janet_arity(argc, 0, 3);
JanetBuffer *buf = (argc >= 2) ? janet_getbuffer(argv, 1) : janet_buffer(10);
if (argc >= 1) {
const char *prompt = (const char *) janet_getstring(argv, 0);
fprintf(out, "%s", prompt);
fflush(out);
}
{
buf->count = 0;
int c;
for (;;) {
c = fgetc(in);
if (feof(in) || c < 0) {
break;
}
janet_buffer_push_u8(buf, (uint8_t) c);
if (c == '\n') break;
}
}
return janet_wrap_buffer(buf);
}
JANET_CORE_FN(janet_core_trace,
"(trace func)",
"Enable tracing on a function. Returns the function.") {
janet_fixarity(argc, 1);
JanetFunction *func = janet_getfunction(argv, 0);
func->gc.flags |= JANET_FUNCFLAG_TRACE;
return argv[0];
}
JANET_CORE_FN(janet_core_untrace,
"(untrace func)",
"Disables tracing on a function. Returns the function.") {
janet_fixarity(argc, 1);
JanetFunction *func = janet_getfunction(argv, 0);
func->gc.flags &= ~JANET_FUNCFLAG_TRACE;
return argv[0];
}
JANET_CORE_FN(janet_core_check_int,
"(int? x)",
"Check if x can be exactly represented as a 32 bit signed two's complement integer.") {
janet_fixarity(argc, 1);
if (!janet_checktype(argv[0], JANET_NUMBER)) goto ret_false;
double num = janet_unwrap_number(argv[0]);
return janet_wrap_boolean(num == (double)((int32_t)num));
ret_false:
return janet_wrap_false();
}
JANET_CORE_FN(janet_core_check_nat,
"(nat? x)",
"Check if x can be exactly represented as a non-negative 32 bit signed two's complement integer.") {
janet_fixarity(argc, 1);
if (!janet_checktype(argv[0], JANET_NUMBER)) goto ret_false;
double num = janet_unwrap_number(argv[0]);
return janet_wrap_boolean(num >= 0 && (num == (double)((int32_t)num)));
ret_false:
return janet_wrap_false();
}
JANET_CORE_FN(janet_core_is_bytes,
"(bytes? x)",
"Check if x is a string, symbol, keyword, or buffer.") {
janet_fixarity(argc, 1);
return janet_wrap_boolean(janet_checktypes(argv[0], JANET_TFLAG_BYTES));
}
JANET_CORE_FN(janet_core_is_indexed,
"(indexed? x)",
"Check if x is an array or tuple.") {
janet_fixarity(argc, 1);
return janet_wrap_boolean(janet_checktypes(argv[0], JANET_TFLAG_INDEXED));
}
JANET_CORE_FN(janet_core_is_dictionary,
"(dictionary? x)",
"Check if x is a table or struct.") {
janet_fixarity(argc, 1);
return janet_wrap_boolean(janet_checktypes(argv[0], JANET_TFLAG_DICTIONARY));
}
JANET_CORE_FN(janet_core_is_lengthable,
"(lengthable? x)",
"Check if x is a bytes, indexed, or dictionary.") {
janet_fixarity(argc, 1);
return janet_wrap_boolean(janet_checktypes(argv[0], JANET_TFLAG_LENGTHABLE));
}
JANET_CORE_FN(janet_core_signal,
"(signal what x)",
"Raise a signal with payload x. ") {
janet_arity(argc, 1, 2);
Janet payload = argc == 2 ? argv[1] : janet_wrap_nil();
if (janet_checkint(argv[0])) {
int32_t s = janet_unwrap_integer(argv[0]);
if (s < 0 || s > 9) {
janet_panicf("expected user signal between 0 and 9, got %d", s);
}
janet_signalv(JANET_SIGNAL_USER0 + s, payload);
} else {
JanetKeyword kw = janet_getkeyword(argv, 0);
for (unsigned i = 0; i < sizeof(janet_signal_names) / sizeof(char *); i++) {
if (!janet_cstrcmp(kw, janet_signal_names[i])) {
janet_signalv((JanetSignal) i, payload);
}
}
}
janet_panicf("unknown signal %v", argv[0]);
}
JANET_CORE_FN(janet_core_memcmp,
"(memcmp a b &opt len offset-a offset-b)",
"Compare memory. Takes two byte sequences `a` and `b`, and "
"return 0 if they have identical contents, a negative integer if a is less than b, "
"and a positive integer if a is greater than b. Optionally take a length and offsets "
"to compare slices of the bytes sequences.") {
janet_arity(argc, 2, 5);
JanetByteView a = janet_getbytes(argv, 0);
JanetByteView b = janet_getbytes(argv, 1);
int32_t len = janet_optnat(argv, argc, 2, a.len < b.len ? a.len : b.len);
int32_t offset_a = janet_optnat(argv, argc, 3, 0);
int32_t offset_b = janet_optnat(argv, argc, 4, 0);
if (offset_a + len > a.len) janet_panicf("invalid offset-a: %d", offset_a);
if (offset_b + len > b.len) janet_panicf("invalid offset-b: %d", offset_b);
return janet_wrap_integer(memcmp(a.bytes + offset_a, b.bytes + offset_b, (size_t) len));
}
typedef struct SandboxOption {
const char *name;
uint32_t flag;
} SandboxOption;
static const SandboxOption sandbox_options[] = {
{"all", JANET_SANDBOX_ALL},
{"env", JANET_SANDBOX_ENV},
{"ffi", JANET_SANDBOX_FFI},
{"ffi-define", JANET_SANDBOX_FFI_DEFINE},
{"ffi-jit", JANET_SANDBOX_FFI_JIT},
{"ffi-use", JANET_SANDBOX_FFI_USE},
{"fs", JANET_SANDBOX_FS},
{"fs-read", JANET_SANDBOX_FS_READ},
{"fs-temp", JANET_SANDBOX_FS_TEMP},
{"fs-write", JANET_SANDBOX_FS_WRITE},
{"hrtime", JANET_SANDBOX_HRTIME},
{"modules", JANET_SANDBOX_DYNAMIC_MODULES},
{"net", JANET_SANDBOX_NET},
{"net-connect", JANET_SANDBOX_NET_CONNECT},
{"net-listen", JANET_SANDBOX_NET_LISTEN},
{"sandbox", JANET_SANDBOX_SANDBOX},
{"signal", JANET_SANDBOX_SIGNAL},
{"subprocess", JANET_SANDBOX_SUBPROCESS},
{NULL, 0}
};
JANET_CORE_FN(janet_core_sandbox,
"(sandbox & forbidden-capabilities)",
"Disable feature sets to prevent the interpreter from using certain system resources. "
"Once a feature is disabled, there is no way to re-enable it. Capabilities can be:\n\n"
"* :all - disallow all (except IO to stdout, stderr, and stdin)\n"
"* :env - disallow reading and write env variables\n"
"* :ffi - disallow FFI (recommended if disabling anything else)\n"
"* :ffi-define - disallow loading new FFI modules and binding new functions\n"
"* :ffi-jit - disallow calling `ffi/jitfn`\n"
"* :ffi-use - disallow using any previously bound FFI functions and memory-unsafe functions.\n"
"* :fs - disallow access to the file system\n"
"* :fs-read - disallow read access to the file system\n"
"* :fs-temp - disallow creating temporary files\n"
"* :fs-write - disallow write access to the file system\n"
"* :hrtime - disallow high-resolution timers\n"
"* :modules - disallow load dynamic modules (natives)\n"
"* :net - disallow network access\n"
"* :net-connect - disallow making outbound network connections\n"
"* :net-listen - disallow accepting inbound network connections\n"
"* :sandbox - disallow calling this function\n"
"* :signal - disallow adding or removing signal handlers\n"
"* :subprocess - disallow running subprocesses") {
uint32_t flags = 0;
for (int32_t i = 0; i < argc; i++) {
JanetKeyword kw = janet_getkeyword(argv, i);
const SandboxOption *opt = sandbox_options;
while (opt->name != NULL) {
if (janet_cstrcmp(kw, opt->name) == 0) {
flags |= opt->flag;
break;
}
opt++;
}
if (opt->name == NULL) janet_panicf("unknown capability %v", argv[i]);
}
janet_sandbox(flags);
return janet_wrap_nil();
}
#ifdef JANET_BOOTSTRAP
/* Utility for inline assembly */
static void janet_quick_asm(
JanetTable *env,
int32_t flags,
const char *name,
int32_t arity,
int32_t min_arity,
int32_t max_arity,
int32_t slots,
const uint32_t *bytecode,
size_t bytecode_size,
const char *doc) {
JanetFuncDef *def = janet_funcdef_alloc();
def->arity = arity;
def->min_arity = min_arity;
def->max_arity = max_arity;
def->flags = flags;
def->slotcount = slots;
def->bytecode = janet_malloc(bytecode_size);
def->bytecode_length = (int32_t)(bytecode_size / sizeof(uint32_t));
def->name = janet_cstring(name);
if (!def->bytecode) {
JANET_OUT_OF_MEMORY;
}
memcpy(def->bytecode, bytecode, bytecode_size);
janet_def_addflags(def);
janet_def(env, name, janet_wrap_function(janet_thunk(def)), doc);
}
/* Macros for easier inline assembly */
#define SSS(op, a, b, c) ((op) | ((a) << 8) | ((b) << 16) | ((c) << 24))
#define SS(op, a, b) ((op) | ((a) << 8) | ((b) << 16))
#define SSI(op, a, b, I) ((op) | ((a) << 8) | ((b) << 16) | ((uint32_t)(I) << 24))
#define S(op, a) ((op) | ((a) << 8))
#define SI(op, a, I) ((op) | ((a) << 8) | ((uint32_t)(I) << 16))
/* Templatize a varop */
static void templatize_varop(
JanetTable *env,
int32_t flags,
const char *name,
int32_t nullary,
int32_t unary,
uint32_t op,
const char *doc) {
/* Variadic operator assembly. Must be templatized for each different opcode. */
/* Reg 0: Argument tuple (args) */
/* Reg 1: Argument count (argn) */
/* Reg 2: Jump flag (jump?) */
/* Reg 3: Accumulator (accum) */
/* Reg 4: Next operand (operand) */
/* Reg 5: Loop iterator (i) */
uint32_t varop_asm[] = {
SS(JOP_LENGTH, 1, 0), /* Put number of arguments in register 1 -> argn = count(args) */
/* Check nullary */
SSS(JOP_EQUALS_IMMEDIATE, 2, 1, 0), /* Check if numargs equal to 0 */
SI(JOP_JUMP_IF_NOT, 2, 3), /* If not 0, jump to next check */
/* Nullary */
SI(JOP_LOAD_INTEGER, 3, nullary), /* accum = nullary value */
S(JOP_RETURN, 3), /* return accum */
/* Check unary */
SSI(JOP_EQUALS_IMMEDIATE, 2, 1, 1), /* Check if numargs equal to 1 */
SI(JOP_JUMP_IF_NOT, 2, 5), /* If not 1, jump to next check */
/* Unary */
SI(JOP_LOAD_INTEGER, 3, unary), /* accum = unary value */
SSI(JOP_GET_INDEX, 4, 0, 0), /* operand = args[0] */
SSS(op, 3, 3, 4), /* accum = accum op operand */
S(JOP_RETURN, 3), /* return accum */
/* Mutli (2 or more) arity */
/* Prime loop */
SSI(JOP_GET_INDEX, 3, 0, 0), /* accum = args[0] */
SI(JOP_LOAD_INTEGER, 5, 1), /* i = 1 */
/* Main loop */
SSS(JOP_IN, 4, 0, 5), /* operand = args[i] */
SSS(op, 3, 3, 4), /* accum = accum op operand */
SSI(JOP_ADD_IMMEDIATE, 5, 5, 1), /* i++ */
SSI(JOP_EQUALS, 2, 5, 1), /* jump? = (i == argn) */
SI(JOP_JUMP_IF_NOT, 2, -4), /* if not jump? go back 4 */
/* Done, do last and return accumulator */
S(JOP_RETURN, 3) /* return accum */
};
janet_quick_asm(
env,
flags | JANET_FUNCDEF_FLAG_VARARG,
name,
0,
0,
INT32_MAX,
6,
varop_asm,
sizeof(varop_asm),
doc);
}
/* Templatize variadic comparators */
static void templatize_comparator(
JanetTable *env,
int32_t flags,
const char *name,
int invert,
uint32_t op,
const char *doc) {
/* Reg 0: Argument tuple (args) */
/* Reg 1: Argument count (argn) */
/* Reg 2: Jump flag (jump?) */
/* Reg 3: Last value (last) */
/* Reg 4: Next operand (next) */
/* Reg 5: Loop iterator (i) */
uint32_t comparator_asm[] = {
SS(JOP_LENGTH, 1, 0), /* Put number of arguments in register 1 -> argn = count(args) */
SSS(JOP_LESS_THAN_IMMEDIATE, 2, 1, 2), /* Check if numargs less than 2 */
SI(JOP_JUMP_IF, 2, 10), /* If numargs < 2, jump to done */
/* Prime loop */
SSI(JOP_GET_INDEX, 3, 0, 0), /* last = args[0] */
SI(JOP_LOAD_INTEGER, 5, 1), /* i = 1 */
/* Main loop */
SSS(JOP_IN, 4, 0, 5), /* next = args[i] */
SSS(op, 2, 3, 4), /* jump? = last compare next */
SI(JOP_JUMP_IF_NOT, 2, 7), /* if not jump? goto fail (return false) */
SSI(JOP_ADD_IMMEDIATE, 5, 5, 1), /* i++ */
SS(JOP_MOVE_NEAR, 3, 4), /* last = next */
SSI(JOP_EQUALS, 2, 5, 1), /* jump? = (i == argn) */
SI(JOP_JUMP_IF_NOT, 2, -6), /* if not jump? go back 6 */
/* Done, return true */
S(invert ? JOP_LOAD_FALSE : JOP_LOAD_TRUE, 3),
S(JOP_RETURN, 3),
/* Failed, return false */
S(invert ? JOP_LOAD_TRUE : JOP_LOAD_FALSE, 3),
S(JOP_RETURN, 3)
};
janet_quick_asm(
env,
flags | JANET_FUNCDEF_FLAG_VARARG,
name,
0,
0,
INT32_MAX,
6,
comparator_asm,
sizeof(comparator_asm),
doc);
}
/* Make the apply function */
static void make_apply(JanetTable *env) {
/* Reg 0: Function (fun) */
/* Reg 1: Argument tuple (args) */
/* Reg 2: Argument count (argn) */
/* Reg 3: Jump flag (jump?) */
/* Reg 4: Loop iterator (i) */
/* Reg 5: Loop values (x) */
uint32_t apply_asm[] = {
SS(JOP_LENGTH, 2, 1),
SSS(JOP_EQUALS_IMMEDIATE, 3, 2, 0), /* Immediate tail call if no args */
SI(JOP_JUMP_IF, 3, 9),
/* Prime loop */
SI(JOP_LOAD_INTEGER, 4, 0), /* i = 0 */
/* Main loop */
SSS(JOP_IN, 5, 1, 4), /* x = args[i] */
SSI(JOP_ADD_IMMEDIATE, 4, 4, 1), /* i++ */
SSI(JOP_EQUALS, 3, 4, 2), /* jump? = (i == argn) */
SI(JOP_JUMP_IF, 3, 3), /* if jump? go forward 3 */
S(JOP_PUSH, 5),
(JOP_JUMP | ((uint32_t)(-5) << 8)),
/* Push the array */
S(JOP_PUSH_ARRAY, 5),
/* Call the funciton */
S(JOP_TAILCALL, 0)
};
janet_quick_asm(env, JANET_FUN_APPLY | JANET_FUNCDEF_FLAG_VARARG,
"apply", 1, 1, INT32_MAX, 6, apply_asm, sizeof(apply_asm),
JDOC("(apply f & args)\n\n"
"Applies a function to a variable number of arguments. Each element in args "
"is used as an argument to f, except the last element in args, which is expected to "
"be an array-like. Each element in this last argument is then also pushed as an argument to "
"f. For example:\n\n"
"\t(apply + 1000 (range 10))\n\n"
"sums the first 10 integers and 1000."));
}
static const uint32_t error_asm[] = {
JOP_ERROR
};
static const uint32_t debug_asm[] = {
JOP_SIGNAL | (2 << 24),
JOP_RETURN
};
static const uint32_t yield_asm[] = {