--- /dev/null
+/*
+ * Command line execution tool. Useful for test cases and manual testing.
+ *
+ * To enable linenoise and other fancy stuff, compile with -DDUK_CMDLINE_FANCY.
+ * It is not the default to maximize portability. You can also compile in
+ * support for example allocators, grep for DUK_CMDLINE_*.
+ */
+
+/* Helper define to enable a feature set; can also use separate defines. */
+#if defined(DUK_CMDLINE_FANCY)
+#define DUK_CMDLINE_LINENOISE
+#define DUK_CMDLINE_LINENOISE_COMPLETION
+#define DUK_CMDLINE_RLIMIT
+#define DUK_CMDLINE_SIGNAL
+#endif
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || \
+ defined(WIN64) || defined(_WIN64) || defined(__WIN64__)
+/* Suppress warnings about plain fopen() etc. */
+#define _CRT_SECURE_NO_WARNINGS
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+/* Workaround for snprintf() missing in older MSVC versions.
+ * Note that _snprintf() may not NUL terminate the string, but
+ * this difference does not matter here as a NUL terminator is
+ * always explicitly added.
+ */
+#define snprintf _snprintf
+#endif
+#endif
+
+#define GREET_CODE(variant) \
+ "print('((o) Duktape" variant " ' + " \
+ "Math.floor(Duktape.version / 10000) + '.' + " \
+ "Math.floor(Duktape.version / 100) % 100 + '.' + " \
+ "Duktape.version % 100" \
+ ", '(" DUK_GIT_DESCRIBE ")');"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined(DUK_CMDLINE_SIGNAL)
+#include <signal.h>
+#endif
+#if defined(DUK_CMDLINE_RLIMIT)
+#include <sys/resource.h>
+#endif
+#if defined(DUK_CMDLINE_LINENOISE)
+#include "linenoise.h"
+#endif
+#if defined(DUK_CMDLINE_FILEIO)
+#include <errno.h>
+#endif
+#if defined(EMSCRIPTEN)
+#include <emscripten.h>
+#endif
+#if defined(DUK_CMDLINE_ALLOC_LOGGING)
+#include "duk_alloc_logging.h"
+#endif
+#if defined(DUK_CMDLINE_ALLOC_TORTURE)
+#include "duk_alloc_torture.h"
+#endif
+#if defined(DUK_CMDLINE_ALLOC_HYBRID)
+#include "duk_alloc_hybrid.h"
+#endif
+#include "duktape.h"
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+/* Defined in duk_cmdline_ajduk.c or alljoyn.js headers. */
+void ajsheap_init(void);
+void ajsheap_free(void);
+void ajsheap_dump(void);
+void ajsheap_register(duk_context *ctx);
+void ajsheap_start_exec_timeout(void);
+void ajsheap_clear_exec_timeout(void);
+void *ajsheap_alloc_wrapped(void *udata, duk_size_t size);
+void *ajsheap_realloc_wrapped(void *udata, void *ptr, duk_size_t size);
+void ajsheap_free_wrapped(void *udata, void *ptr);
+void *AJS_Alloc(void *udata, duk_size_t size);
+void *AJS_Realloc(void *udata, void *ptr, duk_size_t size);
+void AJS_Free(void *udata, void *ptr);
+#endif
+
+#if defined(DUK_CMDLINE_DEBUGGER_SUPPORT)
+#include "duk_trans_socket.h"
+#endif
+
+#define MEM_LIMIT_NORMAL (128*1024*1024) /* 128 MB */
+#define MEM_LIMIT_HIGH (2047*1024*1024) /* ~2 GB */
+#define LINEBUF_SIZE 65536
+
+static int main_argc = 0;
+static char **main_argv = NULL;
+static int interactive_mode = 0;
+#if defined(DUK_CMDLINE_DEBUGGER_SUPPORT)
+static int debugger_reattach = 0;
+#endif
+
+/*
+ * Misc helpers
+ */
+
+#if defined(DUK_CMDLINE_RLIMIT)
+static void set_resource_limits(rlim_t mem_limit_value) {
+ int rc;
+ struct rlimit lim;
+
+ rc = getrlimit(RLIMIT_AS, &lim);
+ if (rc != 0) {
+ fprintf(stderr, "Warning: cannot read RLIMIT_AS\n");
+ return;
+ }
+
+ if (lim.rlim_max < mem_limit_value) {
+ fprintf(stderr, "Warning: rlim_max < mem_limit_value (%d < %d)\n", (int) lim.rlim_max, (int) mem_limit_value);
+ return;
+ }
+
+ lim.rlim_cur = mem_limit_value;
+ lim.rlim_max = mem_limit_value;
+
+ rc = setrlimit(RLIMIT_AS, &lim);
+ if (rc != 0) {
+ fprintf(stderr, "Warning: setrlimit failed\n");
+ return;
+ }
+
+#if 0
+ fprintf(stderr, "Set RLIMIT_AS to %d\n", (int) mem_limit_value);
+#endif
+}
+#endif /* DUK_CMDLINE_RLIMIT */
+
+#if defined(DUK_CMDLINE_SIGNAL)
+static void my_sighandler(int x) {
+ fprintf(stderr, "Got signal %d\n", x);
+ fflush(stderr);
+}
+static void set_sigint_handler(void) {
+ (void) signal(SIGINT, my_sighandler);
+ (void) signal(SIGPIPE, SIG_IGN); /* avoid SIGPIPE killing process */
+}
+#endif /* DUK_CMDLINE_SIGNAL */
+
+static int get_stack_raw(duk_context *ctx) {
+ if (!duk_is_object(ctx, -1)) {
+ return 1;
+ }
+ if (!duk_has_prop_string(ctx, -1, "stack")) {
+ return 1;
+ }
+ if (!duk_is_error(ctx, -1)) {
+ /* Not an Error instance, don't read "stack". */
+ return 1;
+ }
+
+ duk_get_prop_string(ctx, -1, "stack"); /* caller coerces */
+ duk_remove(ctx, -2);
+ return 1;
+}
+
+/* Print error to stderr and pop error. */
+static void print_pop_error(duk_context *ctx, FILE *f) {
+ /* Print error objects with a stack trace specially.
+ * Note that getting the stack trace may throw an error
+ * so this also needs to be safe call wrapped.
+ */
+ (void) duk_safe_call(ctx, get_stack_raw, 1 /*nargs*/, 1 /*nrets*/);
+ fprintf(f, "%s\n", duk_safe_to_string(ctx, -1));
+ fflush(f);
+ duk_pop(ctx);
+}
+
+static int wrapped_compile_execute(duk_context *ctx) {
+ const char *src_data;
+ duk_size_t src_len;
+ int comp_flags;
+
+ /* XXX: Here it'd be nice to get some stats for the compilation result
+ * when a suitable command line is given (e.g. code size, constant
+ * count, function count. These are available internally but not through
+ * the public API.
+ */
+
+ /* Use duk_compile_lstring_filename() variant which avoids interning
+ * the source code. This only really matters for low memory environments.
+ */
+
+ /* [ ... bytecode_filename src_data src_len filename ] */
+
+ src_data = (const char *) duk_require_pointer(ctx, -3);
+ src_len = (duk_size_t) duk_require_uint(ctx, -2);
+
+ if (src_data != NULL && src_len >= 2 && src_data[0] == (char) 0xff) {
+ /* Bytecode. */
+ duk_push_lstring(ctx, src_data, src_len);
+ duk_to_buffer(ctx, -1, NULL);
+ duk_load_function(ctx);
+ } else {
+ /* Source code. */
+ comp_flags = 0;
+ duk_compile_lstring_filename(ctx, comp_flags, src_data, src_len);
+ }
+
+ /* [ ... bytecode_filename src_data src_len function ] */
+
+ /* Optional bytecode dump. */
+ if (duk_is_string(ctx, -4)) {
+ FILE *f;
+ void *bc_ptr;
+ duk_size_t bc_len;
+ size_t wrote;
+ char fnbuf[256];
+ const char *filename;
+
+ duk_dup_top(ctx);
+ duk_dump_function(ctx);
+ bc_ptr = duk_require_buffer(ctx, -1, &bc_len);
+ filename = duk_require_string(ctx, -5);
+#if defined(EMSCRIPTEN)
+ if (filename[0] == '/') {
+ snprintf(fnbuf, sizeof(fnbuf), "%s", filename);
+ } else {
+ snprintf(fnbuf, sizeof(fnbuf), "/working/%s", filename);
+ }
+#else
+ snprintf(fnbuf, sizeof(fnbuf), "%s", filename);
+#endif
+ fnbuf[sizeof(fnbuf) - 1] = (char) 0;
+
+ f = fopen(fnbuf, "wb");
+ if (!f) {
+ duk_error(ctx, DUK_ERR_ERROR, "failed to open bytecode output file");
+ }
+ wrote = fwrite(bc_ptr, 1, (size_t) bc_len, f); /* XXX: handle partial writes */
+ (void) fclose(f);
+ if (wrote != bc_len) {
+ duk_error(ctx, DUK_ERR_ERROR, "failed to write all bytecode");
+ }
+
+ return 0; /* duk_safe_call() cleans up */
+ }
+
+#if 0
+ /* Manual test for bytecode dump/load cycle: dump and load before
+ * execution. Enable manually, then run "make qecmatest" for a
+ * reasonably good coverage of different functions and programs.
+ */
+ duk_dump_function(ctx);
+ duk_load_function(ctx);
+#endif
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_start_exec_timeout();
+#endif
+
+ duk_push_global_object(ctx); /* 'this' binding */
+ duk_call_method(ctx, 0);
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_clear_exec_timeout();
+#endif
+
+ if (interactive_mode) {
+ /*
+ * In interactive mode, write to stdout so output won't
+ * interleave as easily.
+ *
+ * NOTE: the ToString() coercion may fail in some cases;
+ * for instance, if you evaluate:
+ *
+ * ( {valueOf: function() {return {}},
+ * toString: function() {return {}}});
+ *
+ * The error is:
+ *
+ * TypeError: failed to coerce with [[DefaultValue]]
+ * duk_api.c:1420
+ *
+ * These are handled now by the caller which also has stack
+ * trace printing support. User code can print out errors
+ * safely using duk_safe_to_string().
+ */
+
+ fprintf(stdout, "= %s\n", duk_to_string(ctx, -1));
+ fflush(stdout);
+ } else {
+ /* In non-interactive mode, success results are not written at all.
+ * It is important that the result value is not string coerced,
+ * as the string coercion may cause an error in some cases.
+ */
+ }
+
+ return 0; /* duk_safe_call() cleans up */
+}
+
+/*
+ * Minimal Linenoise completion support
+ */
+
+#if defined(DUK_CMDLINE_LINENOISE_COMPLETION)
+static duk_context *completion_ctx;
+
+static int completion_idpart(unsigned char c) {
+ /* Very simplified "is identifier part" check. */
+ if ((c >= (unsigned char) 'a' && c <= (unsigned char) 'z') ||
+ (c >= (unsigned char) 'A' && c <= (unsigned char) 'Z') ||
+ (c >= (unsigned char) '0' && c <= (unsigned char) '9') ||
+ c == (unsigned char) '$' || c == (unsigned char) '_') {
+ return 1;
+ }
+ return 0;
+}
+
+static int completion_digit(unsigned char c) {
+ return (c >= (unsigned char) '0' && c <= (unsigned char) '9');
+}
+
+static duk_ret_t linenoise_completion_lookup(duk_context *ctx) {
+ duk_size_t len;
+ const char *orig;
+ const unsigned char *p;
+ const unsigned char *p_curr;
+ const unsigned char *p_end;
+ const char *key;
+ const char *prefix;
+ linenoiseCompletions *lc;
+ duk_idx_t idx_obj;
+
+ orig = duk_require_string(ctx, -3);
+ p_curr = (const unsigned char *) duk_require_lstring(ctx, -2, &len);
+ p_end = p_curr + len;
+ lc = duk_require_pointer(ctx, -1);
+
+ duk_push_global_object(ctx);
+ idx_obj = duk_require_top_index(ctx);
+
+ while (p_curr <= p_end) {
+ /* p_curr == p_end allowed on purpose, to handle 'Math.' for example. */
+ p = p_curr;
+ while (p < p_end && p[0] != (unsigned char) '.') {
+ p++;
+ }
+ /* 'p' points to a NUL (p == p_end) or a period. */
+ prefix = duk_push_lstring(ctx, (const char *) p_curr, (duk_size_t) (p - p_curr));
+
+#if 0
+ fprintf(stderr, "Completion check: '%s'\n", prefix);
+ fflush(stderr);
+#endif
+
+ if (p == p_end) {
+ /* 'idx_obj' points to the object matching the last
+ * full component, use [p_curr,p[ as a filter for
+ * that object.
+ */
+
+ duk_enum(ctx, idx_obj, DUK_ENUM_INCLUDE_NONENUMERABLE);
+ while (duk_next(ctx, -1, 0 /*get_value*/)) {
+ key = duk_get_string(ctx, -1);
+#if 0
+ fprintf(stderr, "Key: %s\n", key ? key : "");
+ fflush(stderr);
+#endif
+ if (!key) {
+ /* Should never happen, just in case. */
+ goto next;
+ }
+
+ /* Ignore array index keys: usually not desirable, and would
+ * also require ['0'] quoting.
+ */
+ if (completion_digit(key[0])) {
+ goto next;
+ }
+
+ /* XXX: There's no key quoting now, it would require replacing the
+ * last component with a ['foo\nbar'] style lookup when appropriate.
+ */
+
+ if (strlen(prefix) == 0) {
+ /* Partial ends in a period, e.g. 'Math.' -> complete all Math properties. */
+ duk_push_string(ctx, orig); /* original, e.g. 'Math.' */
+ duk_push_string(ctx, key);
+ duk_concat(ctx, 2);
+ linenoiseAddCompletion(lc, duk_require_string(ctx, -1));
+ duk_pop(ctx);
+ } else if (prefix && strcmp(key, prefix) == 0) {
+ /* Full completion, add a period, e.g. input 'Math' -> 'Math.'. */
+ duk_push_string(ctx, orig); /* original, including partial last component */
+ duk_push_string(ctx, ".");
+ duk_concat(ctx, 2);
+ linenoiseAddCompletion(lc, duk_require_string(ctx, -1));
+ duk_pop(ctx);
+ } else if (prefix && strncmp(key, prefix, strlen(prefix)) == 0) {
+ /* Last component is partial, complete. */
+ duk_push_string(ctx, orig); /* original, including partial last component */
+ duk_push_string(ctx, key + strlen(prefix)); /* completion to last component */
+ duk_concat(ctx, 2);
+ linenoiseAddCompletion(lc, duk_require_string(ctx, -1));
+ duk_pop(ctx);
+ }
+
+ next:
+ duk_pop(ctx);
+ }
+ return 0;
+ } else {
+ if (duk_get_prop(ctx, idx_obj)) {
+ duk_to_object(ctx, -1); /* for properties of plain strings etc */
+ duk_replace(ctx, idx_obj);
+ p_curr = p + 1;
+ } else {
+ /* Not found. */
+ return 0;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void linenoise_completion(const char *buf, linenoiseCompletions *lc) {
+ duk_context *ctx;
+ const unsigned char *p_start;
+ const unsigned char *p_end;
+ const unsigned char *p;
+ duk_int_t rc;
+
+ if (!buf) {
+ return;
+ }
+ ctx = completion_ctx;
+ if (!ctx) {
+ return;
+ }
+
+ p_start = (const unsigned char *) buf;
+ p_end = (const unsigned char *) (buf + strlen(buf));
+ p = p_end;
+
+ /* Scan backwards for a maximal string which looks like a property
+ * chain (e.g. foo.bar.quux).
+ */
+
+ while (--p >= p_start) {
+ if (p[0] == (unsigned char) '.') {
+ if (p <= p_start) {
+ break;
+ }
+ if (!completion_idpart(p[-1])) {
+ /* Catches e.g. 'foo..bar' -> we want 'bar' only. */
+ break;
+ }
+ } else if (!completion_idpart(p[0])) {
+ break;
+ }
+ }
+ /* 'p' will either be p_start - 1 (ran out of buffer) or point to
+ * the first offending character.
+ */
+ p++;
+ if (p < p_start || p >= p_end) {
+ return; /* should never happen, but just in case */
+ }
+
+ /* 'p' now points to a string of the form 'foo.bar.quux'. Look up
+ * all the components except the last; treat the last component as
+ * a partial name which is used as a filter for the previous full
+ * component. All lookups are from the global object now.
+ */
+
+#if 0
+ fprintf(stderr, "Completion starting point: '%s'\n", p);
+ fflush(stderr);
+#endif
+
+ duk_push_string(ctx, (const char *) buf);
+ duk_push_lstring(ctx, (const char *) p, (duk_size_t) (p_end - p));
+ duk_push_pointer(ctx, (void *) lc);
+
+ rc = duk_safe_call(ctx, linenoise_completion_lookup, 3 /*nargs*/, 1 /*nrets*/);
+ if (rc != DUK_EXEC_SUCCESS) {
+ fprintf(stderr, "Completion handling failure: %s\n", duk_safe_to_string(ctx, -1));
+ }
+ duk_pop(ctx);
+}
+#endif /* DUK_CMDLINE_LINENOISE_COMPLETION */
+
+/*
+ * Execute from file handle etc
+ */
+
+static int handle_fh(duk_context *ctx, FILE *f, const char *filename, const char *bytecode_filename) {
+ char *buf = NULL;
+ size_t bufsz;
+ size_t bufoff;
+ size_t got;
+ int rc;
+ int retval = -1;
+
+ buf = (char *) malloc(1024);
+ if (!buf) {
+ goto error;
+ }
+ bufsz = 1024;
+ bufoff = 0;
+
+ /* Read until EOF, avoid fseek/stat because it won't work with stdin. */
+ for (;;) {
+ size_t avail;
+
+ avail = bufsz - bufoff;
+ if (avail < 1024) {
+ size_t newsz;
+ char *buf_new;
+#if 0
+ fprintf(stderr, "resizing read buffer: %ld -> %ld\n", (long) bufsz, (long) (bufsz * 2));
+#endif
+ newsz = bufsz + (bufsz >> 2) + 1024; /* +25% and some extra */
+ buf_new = (char *) realloc(buf, newsz);
+ if (!buf_new) {
+ goto error;
+ }
+ buf = buf_new;
+ bufsz = newsz;
+ }
+
+ avail = bufsz - bufoff;
+#if 0
+ fprintf(stderr, "reading input: buf=%p bufsz=%ld bufoff=%ld avail=%ld\n",
+ (void *) buf, (long) bufsz, (long) bufoff, (long) avail);
+#endif
+
+ got = fread((void *) (buf + bufoff), (size_t) 1, avail, f);
+#if 0
+ fprintf(stderr, "got=%ld\n", (long) got);
+#endif
+ if (got == 0) {
+ break;
+ }
+ bufoff += got;
+
+ /* Emscripten specific: stdin EOF doesn't work as expected.
+ * Instead, when 'emduk' is executed using Node.js, a file
+ * piped to stdin repeats (!). Detect that repeat and cut off
+ * the stdin read. Ensure the loop repeats enough times to
+ * avoid detecting spurious loops.
+ *
+ * This only seems to work for inputs up to 256 bytes long.
+ */
+#if defined(EMSCRIPTEN)
+ if (bufoff >= 16384) {
+ size_t i, j, nloops;
+ int looped = 0;
+
+ for (i = 16; i < bufoff / 8; i++) {
+ int ok;
+
+ nloops = bufoff / i;
+ ok = 1;
+ for (j = 1; j < nloops; j++) {
+ if (memcmp((void *) buf, (void *) (buf + i * j), i) != 0) {
+ ok = 0;
+ break;
+ }
+ }
+ if (ok) {
+ fprintf(stderr, "emscripten workaround: detect looping at index %ld, verified with %ld loops\n", (long) i, (long) (nloops - 1));
+ bufoff = i;
+ looped = 1;
+ break;
+ }
+ }
+
+ if (looped) {
+ break;
+ }
+ }
+#endif
+ }
+
+ duk_push_string(ctx, bytecode_filename);
+ duk_push_pointer(ctx, (void *) buf);
+ duk_push_uint(ctx, (duk_uint_t) bufoff);
+ duk_push_string(ctx, filename);
+
+ interactive_mode = 0; /* global */
+
+ rc = duk_safe_call(ctx, wrapped_compile_execute, 4 /*nargs*/, 1 /*nret*/);
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_clear_exec_timeout();
+#endif
+
+ free(buf);
+ buf = NULL;
+
+ if (rc != DUK_EXEC_SUCCESS) {
+ print_pop_error(ctx, stderr);
+ goto error;
+ } else {
+ duk_pop(ctx);
+ retval = 0;
+ }
+ /* fall thru */
+
+ cleanup:
+ if (buf) {
+ free(buf);
+ buf = NULL;
+ }
+ return retval;
+
+ error:
+ fprintf(stderr, "error in executing file %s\n", filename);
+ fflush(stderr);
+ goto cleanup;
+}
+
+static int handle_file(duk_context *ctx, const char *filename, const char *bytecode_filename) {
+ FILE *f = NULL;
+ int retval;
+ char fnbuf[256];
+
+ /* Example of sending an application specific debugger notification. */
+ duk_push_string(ctx, "DebuggerHandleFile");
+ duk_push_string(ctx, filename);
+ duk_debugger_notify(ctx, 2);
+
+#if defined(EMSCRIPTEN)
+ if (filename[0] == '/') {
+ snprintf(fnbuf, sizeof(fnbuf), "%s", filename);
+ } else {
+ snprintf(fnbuf, sizeof(fnbuf), "/working/%s", filename);
+ }
+#else
+ snprintf(fnbuf, sizeof(fnbuf), "%s", filename);
+#endif
+ fnbuf[sizeof(fnbuf) - 1] = (char) 0;
+
+ f = fopen(fnbuf, "rb");
+ if (!f) {
+ fprintf(stderr, "failed to open source file: %s\n", filename);
+ fflush(stderr);
+ goto error;
+ }
+
+ retval = handle_fh(ctx, f, filename, bytecode_filename);
+
+ fclose(f);
+ return retval;
+
+ error:
+ return -1;
+}
+
+static int handle_eval(duk_context *ctx, char *code) {
+ int rc;
+ int retval = -1;
+
+ duk_push_pointer(ctx, (void *) code);
+ duk_push_uint(ctx, (duk_uint_t) strlen(code));
+ duk_push_string(ctx, "eval");
+
+ interactive_mode = 0; /* global */
+
+ rc = duk_safe_call(ctx, wrapped_compile_execute, 3 /*nargs*/, 1 /*nret*/);
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_clear_exec_timeout();
+#endif
+
+ if (rc != DUK_EXEC_SUCCESS) {
+ print_pop_error(ctx, stderr);
+ } else {
+ duk_pop(ctx);
+ retval = 0;
+ }
+
+ return retval;
+}
+
+#if defined(DUK_CMDLINE_LINENOISE)
+static int handle_interactive(duk_context *ctx) {
+ const char *prompt = "duk> ";
+ char *buffer = NULL;
+ int retval = 0;
+ int rc;
+
+ duk_eval_string(ctx, GREET_CODE(" [linenoise]"));
+ duk_pop(ctx);
+
+ linenoiseSetMultiLine(1);
+ linenoiseHistorySetMaxLen(64);
+#if defined(DUK_CMDLINE_LINENOISE_COMPLETION)
+ linenoiseSetCompletionCallback(linenoise_completion);
+#endif
+
+ for (;;) {
+ if (buffer) {
+ linenoiseFree(buffer);
+ buffer = NULL;
+ }
+
+#if defined(DUK_CMDLINE_LINENOISE_COMPLETION)
+ completion_ctx = ctx;
+#endif
+ buffer = linenoise(prompt);
+#if defined(DUK_CMDLINE_LINENOISE_COMPLETION)
+ completion_ctx = NULL;
+#endif
+
+ if (!buffer) {
+ break;
+ }
+
+ if (buffer && buffer[0] != (char) 0) {
+ linenoiseHistoryAdd(buffer);
+ }
+
+ duk_push_pointer(ctx, (void *) buffer);
+ duk_push_uint(ctx, (duk_uint_t) strlen(buffer));
+ duk_push_string(ctx, "input");
+
+ interactive_mode = 1; /* global */
+
+ rc = duk_safe_call(ctx, wrapped_compile_execute, 3 /*nargs*/, 1 /*nret*/);
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_clear_exec_timeout();
+#endif
+
+ if (buffer) {
+ linenoiseFree(buffer);
+ buffer = NULL;
+ }
+
+ if (rc != DUK_EXEC_SUCCESS) {
+ /* in interactive mode, write to stdout */
+ print_pop_error(ctx, stdout);
+ retval = -1; /* an error 'taints' the execution */
+ } else {
+ duk_pop(ctx);
+ }
+ }
+
+ if (buffer) {
+ linenoiseFree(buffer);
+ buffer = NULL;
+ }
+
+ return retval;
+}
+#else /* DUK_CMDLINE_LINENOISE */
+static int handle_interactive(duk_context *ctx) {
+ const char *prompt = "duk> ";
+ char *buffer = NULL;
+ int retval = 0;
+ int rc;
+ int got_eof = 0;
+
+ duk_eval_string(ctx, GREET_CODE(""));
+ duk_pop(ctx);
+
+ buffer = (char *) malloc(LINEBUF_SIZE);
+ if (!buffer) {
+ fprintf(stderr, "failed to allocated a line buffer\n");
+ fflush(stderr);
+ retval = -1;
+ goto done;
+ }
+
+ while (!got_eof) {
+ size_t idx = 0;
+
+ fwrite(prompt, 1, strlen(prompt), stdout);
+ fflush(stdout);
+
+ for (;;) {
+ int c = fgetc(stdin);
+ if (c == EOF) {
+ got_eof = 1;
+ break;
+ } else if (c == '\n') {
+ break;
+ } else if (idx >= LINEBUF_SIZE) {
+ fprintf(stderr, "line too long\n");
+ fflush(stderr);
+ retval = -1;
+ goto done;
+ } else {
+ buffer[idx++] = (char) c;
+ }
+ }
+
+ duk_push_pointer(ctx, (void *) buffer);
+ duk_push_uint(ctx, (duk_uint_t) idx);
+ duk_push_string(ctx, "input");
+
+ interactive_mode = 1; /* global */
+
+ rc = duk_safe_call(ctx, wrapped_compile_execute, 3 /*nargs*/, 1 /*nret*/);
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_clear_exec_timeout();
+#endif
+
+ if (rc != DUK_EXEC_SUCCESS) {
+ /* in interactive mode, write to stdout */
+ print_pop_error(ctx, stdout);
+ retval = -1; /* an error 'taints' the execution */
+ } else {
+ duk_pop(ctx);
+ }
+ }
+
+ done:
+ if (buffer) {
+ free(buffer);
+ buffer = NULL;
+ }
+
+ return retval;
+}
+#endif /* DUK_CMDLINE_LINENOISE */
+
+/*
+ * Simple file read/write bindings
+ */
+
+#if defined(DUK_CMDLINE_FILEIO)
+static duk_ret_t fileio_read_file(duk_context *ctx) {
+ const char *fn;
+ char *buf;
+ size_t len;
+ size_t off;
+ int rc;
+ FILE *f;
+
+ fn = duk_require_string(ctx, 0);
+ f = fopen(fn, "rb");
+ if (!f) {
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "cannot open file %s for reading, errno %ld: %s",
+ fn, (long) errno, strerror(errno));
+ }
+
+ rc = fseek(f, 0, SEEK_END);
+ if (rc < 0) {
+ (void) fclose(f);
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "fseek() failed for %s, errno %ld: %s",
+ fn, (long) errno, strerror(errno));
+ }
+ len = (size_t) ftell(f);
+ rc = fseek(f, 0, SEEK_SET);
+ if (rc < 0) {
+ (void) fclose(f);
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "fseek() failed for %s, errno %ld: %s",
+ fn, (long) errno, strerror(errno));
+ }
+
+ buf = (char *) duk_push_fixed_buffer(ctx, (duk_size_t) len);
+ for (off = 0; off < len;) {
+ size_t got;
+ got = fread((void *) (buf + off), 1, len - off, f);
+ if (ferror(f)) {
+ (void) fclose(f);
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "error while reading %s", fn);
+ }
+ if (got == 0) {
+ if (feof(f)) {
+ break;
+ } else {
+ (void) fclose(f);
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "error while reading %s", fn);
+ }
+ }
+ off += got;
+ }
+
+ if (f) {
+ (void) fclose(f);
+ }
+
+ return 1;
+}
+
+static duk_ret_t fileio_write_file(duk_context *ctx) {
+ const char *fn;
+ const char *buf;
+ size_t len;
+ size_t off;
+ FILE *f;
+
+ fn = duk_require_string(ctx, 0);
+ f = fopen(fn, "wb");
+ if (!f) {
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "cannot open file %s for writing, errno %ld: %s",
+ fn, (long) errno, strerror(errno));
+ }
+
+ len = 0;
+ buf = (char *) duk_to_buffer(ctx, 1, &len);
+ for (off = 0; off < len;) {
+ size_t got;
+ got = fwrite((const void *) (buf + off), 1, len - off, f);
+ if (ferror(f)) {
+ (void) fclose(f);
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "error while writing %s", fn);
+ }
+ if (got == 0) {
+ (void) fclose(f);
+ duk_error(ctx, DUK_ERR_TYPE_ERROR, "error while writing %s", fn);
+ }
+ off += got;
+ }
+
+ if (f) {
+ (void) fclose(f);
+ }
+
+ return 0;
+}
+#endif /* DUK_CMDLINE_FILEIO */
+
+/*
+ * Duktape heap lifecycle
+ */
+
+#if defined(DUK_CMDLINE_DEBUGGER_SUPPORT)
+static duk_idx_t debugger_request(duk_context *ctx, void *udata, duk_idx_t nvalues) {
+ const char *cmd;
+ int i;
+
+ (void) udata;
+
+ if (nvalues < 1) {
+ duk_push_string(ctx, "missing AppRequest argument(s)");
+ return -1;
+ }
+
+ cmd = duk_get_string(ctx, -nvalues + 0);
+
+ if (cmd && strcmp(cmd, "CommandLine") == 0) {
+ if (!duk_check_stack(ctx, main_argc)) {
+ /* Callback should avoid errors for now, so use
+ * duk_check_stack() rather than duk_require_stack().
+ */
+ duk_push_string(ctx, "failed to extend stack");
+ return -1;
+ }
+ for (i = 0; i < main_argc; i++) {
+ duk_push_string(ctx, main_argv[i]);
+ }
+ return main_argc;
+ }
+ duk_push_sprintf(ctx, "command not supported");
+ return -1;
+}
+
+static void debugger_detached(void *udata) {
+ duk_context *ctx = (duk_context *) udata;
+ (void) ctx;
+ fprintf(stderr, "Debugger detached, udata: %p\n", (void *) udata);
+ fflush(stderr);
+
+ /* Ensure socket is closed even when detach is initiated by Duktape
+ * rather than debug client.
+ */
+ duk_trans_socket_finish();
+
+ if (debugger_reattach) {
+ /* For automatic reattach testing. */
+ duk_trans_socket_init();
+ duk_trans_socket_waitconn();
+ fprintf(stderr, "Debugger reconnected, call duk_debugger_attach()\n");
+ fflush(stderr);
+#if 0
+ /* This is not necessary but should be harmless. */
+ duk_debugger_detach(ctx);
+#endif
+ duk_debugger_attach_custom(ctx,
+ duk_trans_socket_read_cb,
+ duk_trans_socket_write_cb,
+ duk_trans_socket_peek_cb,
+ duk_trans_socket_read_flush_cb,
+ duk_trans_socket_write_flush_cb,
+ debugger_request,
+ debugger_detached,
+ (void *) ctx);
+ }
+}
+#endif
+
+#define ALLOC_DEFAULT 0
+#define ALLOC_LOGGING 1
+#define ALLOC_TORTURE 2
+#define ALLOC_HYBRID 3
+#define ALLOC_AJSHEAP 4
+
+static duk_context *create_duktape_heap(int alloc_provider, int debugger, int ajsheap_log) {
+ duk_context *ctx;
+
+ (void) ajsheap_log; /* suppress warning */
+
+ ctx = NULL;
+ if (!ctx && alloc_provider == ALLOC_LOGGING) {
+#if defined(DUK_CMDLINE_ALLOC_LOGGING)
+ ctx = duk_create_heap(duk_alloc_logging,
+ duk_realloc_logging,
+ duk_free_logging,
+ (void *) 0xdeadbeef,
+ NULL);
+#else
+ fprintf(stderr, "Warning: option --alloc-logging ignored, no logging allocator support\n");
+ fflush(stderr);
+#endif
+ }
+ if (!ctx && alloc_provider == ALLOC_TORTURE) {
+#if defined(DUK_CMDLINE_ALLOC_TORTURE)
+ ctx = duk_create_heap(duk_alloc_torture,
+ duk_realloc_torture,
+ duk_free_torture,
+ (void *) 0xdeadbeef,
+ NULL);
+#else
+ fprintf(stderr, "Warning: option --alloc-torture ignored, no torture allocator support\n");
+ fflush(stderr);
+#endif
+ }
+ if (!ctx && alloc_provider == ALLOC_HYBRID) {
+#if defined(DUK_CMDLINE_ALLOC_HYBRID)
+ void *udata = duk_alloc_hybrid_init();
+ if (!udata) {
+ fprintf(stderr, "Failed to init hybrid allocator\n");
+ fflush(stderr);
+ } else {
+ ctx = duk_create_heap(duk_alloc_hybrid,
+ duk_realloc_hybrid,
+ duk_free_hybrid,
+ udata,
+ NULL);
+ }
+#else
+ fprintf(stderr, "Warning: option --alloc-hybrid ignored, no hybrid allocator support\n");
+ fflush(stderr);
+#endif
+ }
+ if (!ctx && alloc_provider == ALLOC_AJSHEAP) {
+#if defined(DUK_CMDLINE_AJSHEAP)
+ ajsheap_init();
+
+ ctx = duk_create_heap(
+ ajsheap_log ? ajsheap_alloc_wrapped : AJS_Alloc,
+ ajsheap_log ? ajsheap_realloc_wrapped : AJS_Realloc,
+ ajsheap_log ? ajsheap_free_wrapped : AJS_Free,
+ (void *) 0xdeadbeef, /* heap_udata: ignored by AjsHeap, use as marker */
+ NULL
+ ); /* fatal_handler */
+#else
+ fprintf(stderr, "Warning: option --alloc-ajsheap ignored, no ajsheap allocator support\n");
+ fflush(stderr);
+#endif
+ }
+ if (!ctx && alloc_provider == ALLOC_DEFAULT) {
+ ctx = duk_create_heap_default();
+ }
+
+ if (!ctx) {
+ fprintf(stderr, "Failed to create Duktape heap\n");
+ fflush(stderr);
+ exit(-1);
+ }
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ if (alloc_provider == ALLOC_AJSHEAP) {
+ fprintf(stdout, "Pool dump after heap creation\n");
+ ajsheap_dump();
+ }
+#endif
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ if (alloc_provider == ALLOC_AJSHEAP) {
+ ajsheap_register(ctx);
+ }
+#endif
+
+#if defined(DUK_CMDLINE_FILEIO)
+ duk_push_c_function(ctx, fileio_read_file, 1 /*nargs*/);
+ duk_put_global_string(ctx, "readFile");
+ duk_push_c_function(ctx, fileio_write_file, 2 /*nargs*/);
+ duk_put_global_string(ctx, "writeFile");
+#endif
+
+ if (debugger) {
+#if defined(DUK_CMDLINE_DEBUGGER_SUPPORT)
+ fprintf(stderr, "Debugger enabled, create socket and wait for connection\n");
+ fflush(stderr);
+ duk_trans_socket_init();
+ duk_trans_socket_waitconn();
+ fprintf(stderr, "Debugger connected, call duk_debugger_attach() and then execute requested file(s)/eval\n");
+ fflush(stderr);
+ duk_debugger_attach_custom(ctx,
+ duk_trans_socket_read_cb,
+ duk_trans_socket_write_cb,
+ duk_trans_socket_peek_cb,
+ duk_trans_socket_read_flush_cb,
+ duk_trans_socket_write_flush_cb,
+ debugger_request,
+ debugger_detached,
+ (void *) ctx);
+#else
+ fprintf(stderr, "Warning: option --debugger ignored, no debugger support\n");
+ fflush(stderr);
+#endif
+ }
+
+#if 0
+ /* Manual test for duk_debugger_cooperate() */
+ {
+ for (i = 0; i < 60; i++) {
+ printf("cooperate: %d\n", i);
+ usleep(1000000);
+ duk_debugger_cooperate(ctx);
+ }
+ }
+#endif
+
+ return ctx;
+}
+
+static void destroy_duktape_heap(duk_context *ctx, int alloc_provider) {
+ (void) alloc_provider;
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ if (alloc_provider == ALLOC_AJSHEAP) {
+ fprintf(stdout, "Pool dump before duk_destroy_heap(), before forced gc\n");
+ ajsheap_dump();
+
+ duk_gc(ctx, 0);
+
+ fprintf(stdout, "Pool dump before duk_destroy_heap(), after forced gc\n");
+ ajsheap_dump();
+ }
+#endif
+
+ if (ctx) {
+ duk_destroy_heap(ctx);
+ }
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ if (alloc_provider == ALLOC_AJSHEAP) {
+ fprintf(stdout, "Pool dump after duk_destroy_heap() (should have zero allocs)\n");
+ ajsheap_dump();
+ }
+ ajsheap_free();
+#endif
+}
+
+/*
+ * Main
+ */
+
+int main(int argc, char *argv[]) {
+ duk_context *ctx = NULL;
+ int retval = 0;
+ int have_files = 0;
+ int have_eval = 0;
+ int interactive = 0;
+ int memlimit_high = 1;
+ int alloc_provider = ALLOC_DEFAULT;
+ int ajsheap_log = 0;
+ int debugger = 0;
+ int recreate_heap = 0;
+ int no_heap_destroy = 0;
+ int verbose = 0;
+ int run_stdin = 0;
+ const char *compile_filename = NULL;
+ int i;
+
+ main_argc = argc;
+ main_argv = (char **) argv;
+
+#if defined(EMSCRIPTEN)
+ /* Try to use NODEFS to provide access to local files. Mount the
+ * CWD as /working, and then prepend "/working/" to relative native
+ * paths in file calls to get something that works reasonably for
+ * relative paths. Emscripten doesn't support replacing virtual
+ * "/" with host "/" (the default MEMFS at "/" can't be unmounted)
+ * but we can mount "/tmp" as host "/tmp" to allow testcase runs.
+ *
+ * https://kripken.github.io/emscripten-site/docs/api_reference/Filesystem-API.html#filesystem-api-nodefs
+ * https://github.com/kripken/emscripten/blob/master/tests/fs/test_nodefs_rw.c
+ */
+ EM_ASM(
+ /* At the moment it's not possible to replace the default MEMFS mounted at '/':
+ * https://github.com/kripken/emscripten/issues/2040
+ * https://github.com/kripken/emscripten/blob/incoming/src/library_fs.js#L1341-L1358
+ */
+ /*
+ try {
+ FS.unmount("/");
+ } catch (e) {
+ console.log("Failed to unmount default '/' MEMFS mount: " + e);
+ }
+ */
+ try {
+ FS.mkdir("/working");
+ FS.mount(NODEFS, { root: "." }, "/working");
+ } catch (e) {
+ console.log("Failed to mount NODEFS /working: " + e);
+ }
+ /* A virtual '/tmp' exists by default:
+ * https://gist.github.com/evanw/e6be28094f34451bd5bd#file-temp-js-L3806-L3809
+ */
+ /*
+ try {
+ FS.mkdir("/tmp");
+ } catch (e) {
+ console.log("Failed to create virtual /tmp: " + e);
+ }
+ */
+ try {
+ FS.mount(NODEFS, { root: "/tmp" }, "/tmp");
+ } catch (e) {
+ console.log("Failed to mount NODEFS /tmp: " + e);
+ }
+ );
+#endif /* EMSCRIPTEN */
+
+#if defined(DUK_CMDLINE_AJSHEAP)
+ alloc_provider = ALLOC_AJSHEAP;
+#endif
+ (void) ajsheap_log;
+
+ /*
+ * Signal handling setup
+ */
+
+#if defined(DUK_CMDLINE_SIGNAL)
+ set_sigint_handler();
+
+ /* This is useful at the global level; libraries should avoid SIGPIPE though */
+ /*signal(SIGPIPE, SIG_IGN);*/
+#endif
+
+ /*
+ * Parse options
+ */
+
+ for (i = 1; i < argc; i++) {
+ char *arg = argv[i];
+ if (!arg) {
+ goto usage;
+ }
+ if (strcmp(arg, "--restrict-memory") == 0) {
+ memlimit_high = 0;
+ } else if (strcmp(arg, "-i") == 0) {
+ interactive = 1;
+ } else if (strcmp(arg, "-c") == 0) {
+ if (i == argc - 1) {
+ goto usage;
+ }
+ i++;
+ compile_filename = argv[i];
+ } else if (strcmp(arg, "-e") == 0) {
+ have_eval = 1;
+ if (i == argc - 1) {
+ goto usage;
+ }
+ i++; /* skip code */
+ } else if (strcmp(arg, "--alloc-default") == 0) {
+ alloc_provider = ALLOC_DEFAULT;
+ } else if (strcmp(arg, "--alloc-logging") == 0) {
+ alloc_provider = ALLOC_LOGGING;
+ } else if (strcmp(arg, "--alloc-torture") == 0) {
+ alloc_provider = ALLOC_TORTURE;
+ } else if (strcmp(arg, "--alloc-hybrid") == 0) {
+ alloc_provider = ALLOC_HYBRID;
+ } else if (strcmp(arg, "--alloc-ajsheap") == 0) {
+ alloc_provider = ALLOC_AJSHEAP;
+ } else if (strcmp(arg, "--ajsheap-log") == 0) {
+ ajsheap_log = 1;
+ } else if (strcmp(arg, "--debugger") == 0) {
+ debugger = 1;
+#if defined(DUK_CMDLINE_DEBUGGER_SUPPORT)
+ } else if (strcmp(arg, "--reattach") == 0) {
+ debugger_reattach = 1;
+#endif
+ } else if (strcmp(arg, "--recreate-heap") == 0) {
+ recreate_heap = 1;
+ } else if (strcmp(arg, "--no-heap-destroy") == 0) {
+ no_heap_destroy = 1;
+ } else if (strcmp(arg, "--verbose") == 0) {
+ verbose = 1;
+ } else if (strcmp(arg, "--run-stdin") == 0) {
+ run_stdin = 1;
+ } else if (strlen(arg) >= 1 && arg[0] == '-') {
+ goto usage;
+ } else {
+ have_files = 1;
+ }
+ }
+ if (!have_files && !have_eval && !run_stdin) {
+ interactive = 1;
+ }
+
+ /*
+ * Memory limit
+ */
+
+#if defined(DUK_CMDLINE_RLIMIT)
+ set_resource_limits(memlimit_high ? MEM_LIMIT_HIGH : MEM_LIMIT_NORMAL);
+#else
+ if (memlimit_high == 0) {
+ fprintf(stderr, "Warning: option --restrict-memory ignored, no rlimit support\n");
+ fflush(stderr);
+ }
+#endif
+
+ /*
+ * Create heap
+ */
+
+ ctx = create_duktape_heap(alloc_provider, debugger, ajsheap_log);
+
+ /*
+ * Execute any argument file(s)
+ */
+
+ for (i = 1; i < argc; i++) {
+ char *arg = argv[i];
+ if (!arg) {
+ continue;
+ } else if (strlen(arg) == 2 && strcmp(arg, "-e") == 0) {
+ /* Here we know the eval arg exists but check anyway */
+ if (i == argc - 1) {
+ retval = 1;
+ goto cleanup;
+ }
+ if (handle_eval(ctx, argv[i + 1]) != 0) {
+ retval = 1;
+ goto cleanup;
+ }
+ i++; /* skip code */
+ continue;
+ } else if (strlen(arg) == 2 && strcmp(arg, "-c") == 0) {
+ i++; /* skip filename */
+ continue;
+ } else if (strlen(arg) >= 1 && arg[0] == '-') {
+ continue;
+ }
+
+ if (verbose) {
+ fprintf(stderr, "*** Executing file: %s\n", arg);
+ fflush(stderr);
+ }
+
+ if (handle_file(ctx, arg, compile_filename) != 0) {
+ retval = 1;
+ goto cleanup;
+ }
+
+ if (recreate_heap) {
+ if (verbose) {
+ fprintf(stderr, "*** Recreating heap...\n");
+ fflush(stderr);
+ }
+
+ destroy_duktape_heap(ctx, alloc_provider);
+ ctx = create_duktape_heap(alloc_provider, debugger, ajsheap_log);
+ }
+ }
+
+ if (run_stdin) {
+ /* Running stdin like a full file (reading all lines before
+ * compiling) is useful with emduk:
+ * cat test.js | ./emduk --run-stdin
+ */
+ if (handle_fh(ctx, stdin, "stdin", compile_filename) != 0) {
+ retval = 1;
+ goto cleanup;
+ }
+
+ if (recreate_heap) {
+ if (verbose) {
+ fprintf(stderr, "*** Recreating heap...\n");
+ fflush(stderr);
+ }
+
+ destroy_duktape_heap(ctx, alloc_provider);
+ ctx = create_duktape_heap(alloc_provider, debugger, ajsheap_log);
+ }
+ }
+
+ /*
+ * Enter interactive mode if options indicate it
+ */
+
+ if (interactive) {
+ if (handle_interactive(ctx) != 0) {
+ retval = 1;
+ goto cleanup;
+ }
+ }
+
+ /*
+ * Cleanup and exit
+ */
+
+ cleanup:
+ if (interactive) {
+ fprintf(stderr, "Cleaning up...\n");
+ fflush(stderr);
+ }
+
+ if (ctx && no_heap_destroy) {
+ duk_gc(ctx, 0);
+ }
+ if (ctx && !no_heap_destroy) {
+ destroy_duktape_heap(ctx, alloc_provider);
+ }
+ ctx = NULL;
+
+ return retval;
+
+ /*
+ * Usage
+ */
+
+ usage:
+ fprintf(stderr, "Usage: duk [options] [<filenames>]\n"
+ "\n"
+ " -i enter interactive mode after executing argument file(s) / eval code\n"
+ " -e CODE evaluate code\n"
+ " -c FILE compile into bytecode (use with only one file argument)\n"
+ " --run-stdin treat stdin like a file, i.e. compile full input (not line by line)\n"
+ " --verbose verbose messages to stderr\n"
+ " --restrict-memory use lower memory limit (used by test runner)\n"
+ " --alloc-default use Duktape default allocator\n"
+#if defined(DUK_CMDLINE_ALLOC_LOGGING)
+ " --alloc-logging use logging allocator (writes to /tmp)\n"
+#endif
+#if defined(DUK_CMDLINE_ALLOC_TORTURE)
+ " --alloc-torture use torture allocator\n"
+#endif
+#if defined(DUK_CMDLINE_ALLOC_HYBRID)
+ " --alloc-hybrid use hybrid allocator\n"
+#endif
+#if defined(DUK_CMDLINE_AJSHEAP)
+ " --alloc-ajsheap use ajsheap allocator (enabled by default with 'ajduk')\n"
+ " --ajsheap-log write alloc log to /tmp/ajduk-alloc-log.txt\n"
+#endif
+#if defined(DUK_CMDLINE_DEBUGGER_SUPPORT)
+ " --debugger start example debugger\n"
+ " --reattach automatically reattach debugger on detach\n"
+#endif
+ " --recreate-heap recreate heap after every file\n"
+ " --no-heap-destroy force GC, but don't destroy heap at end (leak testing)\n"
+ "\n"
+ "If <filename> is omitted, interactive mode is started automatically.\n");
+ fflush(stderr);
+ exit(1);
+}
projects / ceph.git / blobdiff