1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include "smart-array-pointer.h"
35 #include "string-stream.h"
41 // Define all of our flags.
42 #define FLAG_MODE_DEFINE
43 #include "flag-definitions.h"
45 // Define all of our flags default values.
46 #define FLAG_MODE_DEFINE_DEFAULTS
47 #include "flag-definitions.h"
51 // This structure represents a single entry in the flag system, with a pointer
52 // to the actual flag, default value, comment, etc. This is designed to be POD
53 // initialized as to avoid requiring static constructors.
55 enum FlagType { TYPE_BOOL, TYPE_INT, TYPE_FLOAT, TYPE_STRING, TYPE_ARGS };
57 FlagType type_; // What type of flag, bool, int, or string.
58 const char* name_; // Name of the flag, ex "my_flag".
59 void* valptr_; // Pointer to the global flag variable.
60 const void* defptr_; // Pointer to the default value.
61 const char* cmt_; // A comment about the flags purpose.
62 bool owns_ptr_; // Does the flag own its string value?
64 FlagType type() const { return type_; }
66 const char* name() const { return name_; }
68 const char* comment() const { return cmt_; }
70 bool* bool_variable() const {
71 ASSERT(type_ == TYPE_BOOL);
72 return reinterpret_cast<bool*>(valptr_);
75 int* int_variable() const {
76 ASSERT(type_ == TYPE_INT);
77 return reinterpret_cast<int*>(valptr_);
80 double* float_variable() const {
81 ASSERT(type_ == TYPE_FLOAT);
82 return reinterpret_cast<double*>(valptr_);
85 const char* string_value() const {
86 ASSERT(type_ == TYPE_STRING);
87 return *reinterpret_cast<const char**>(valptr_);
90 void set_string_value(const char* value, bool owns_ptr) {
91 ASSERT(type_ == TYPE_STRING);
92 const char** ptr = reinterpret_cast<const char**>(valptr_);
93 if (owns_ptr_ && *ptr != NULL) DeleteArray(*ptr);
98 JSArguments* args_variable() const {
99 ASSERT(type_ == TYPE_ARGS);
100 return reinterpret_cast<JSArguments*>(valptr_);
103 bool bool_default() const {
104 ASSERT(type_ == TYPE_BOOL);
105 return *reinterpret_cast<const bool*>(defptr_);
108 int int_default() const {
109 ASSERT(type_ == TYPE_INT);
110 return *reinterpret_cast<const int*>(defptr_);
113 double float_default() const {
114 ASSERT(type_ == TYPE_FLOAT);
115 return *reinterpret_cast<const double*>(defptr_);
118 const char* string_default() const {
119 ASSERT(type_ == TYPE_STRING);
120 return *reinterpret_cast<const char* const *>(defptr_);
123 JSArguments args_default() const {
124 ASSERT(type_ == TYPE_ARGS);
125 return *reinterpret_cast<const JSArguments*>(defptr_);
128 // Compare this flag's current value against the default.
129 bool IsDefault() const {
132 return *bool_variable() == bool_default();
134 return *int_variable() == int_default();
136 return *float_variable() == float_default();
138 const char* str1 = string_value();
139 const char* str2 = string_default();
140 if (str2 == NULL) return str1 == NULL;
141 if (str1 == NULL) return str2 == NULL;
142 return strcmp(str1, str2) == 0;
145 return args_variable()->argc() == 0;
151 // Set a flag back to it's default value.
155 *bool_variable() = bool_default();
158 *int_variable() = int_default();
161 *float_variable() = float_default();
164 set_string_value(string_default(), false);
167 *args_variable() = args_default();
174 #define FLAG_MODE_META
175 #include "flag-definitions.h"
178 const size_t num_flags = sizeof(flags) / sizeof(*flags);
183 static const char* Type2String(Flag::FlagType type) {
185 case Flag::TYPE_BOOL: return "bool";
186 case Flag::TYPE_INT: return "int";
187 case Flag::TYPE_FLOAT: return "float";
188 case Flag::TYPE_STRING: return "string";
189 case Flag::TYPE_ARGS: return "arguments";
196 static SmartArrayPointer<const char> ToString(Flag* flag) {
197 HeapStringAllocator string_allocator;
198 StringStream buffer(&string_allocator);
199 switch (flag->type()) {
200 case Flag::TYPE_BOOL:
201 buffer.Add("%s", (*flag->bool_variable() ? "true" : "false"));
204 buffer.Add("%d", *flag->int_variable());
206 case Flag::TYPE_FLOAT:
207 buffer.Add("%f", FmtElm(*flag->float_variable()));
209 case Flag::TYPE_STRING: {
210 const char* str = flag->string_value();
211 buffer.Add("%s", str ? str : "NULL");
214 case Flag::TYPE_ARGS: {
215 JSArguments args = *flag->args_variable();
216 if (args.argc() > 0) {
217 buffer.Add("%s", args[0]);
218 for (int i = 1; i < args.argc(); i++) {
219 buffer.Add(" %s", args[i]);
225 return buffer.ToCString();
230 List<const char*>* FlagList::argv() {
231 List<const char*>* args = new List<const char*>(8);
232 Flag* args_flag = NULL;
233 for (size_t i = 0; i < num_flags; ++i) {
235 if (!f->IsDefault()) {
236 if (f->type() == Flag::TYPE_ARGS) {
237 ASSERT(args_flag == NULL);
238 args_flag = f; // Must be last in arguments.
241 HeapStringAllocator string_allocator;
242 StringStream buffer(&string_allocator);
243 if (f->type() != Flag::TYPE_BOOL || *(f->bool_variable())) {
244 buffer.Add("--%s", f->name());
246 buffer.Add("--no%s", f->name());
248 args->Add(buffer.ToCString().Detach());
249 if (f->type() != Flag::TYPE_BOOL) {
250 args->Add(ToString(f).Detach());
254 if (args_flag != NULL) {
255 HeapStringAllocator string_allocator;
256 StringStream buffer(&string_allocator);
257 buffer.Add("--%s", args_flag->name());
258 args->Add(buffer.ToCString().Detach());
259 JSArguments jsargs = *args_flag->args_variable();
260 for (int j = 0; j < jsargs.argc(); j++) {
261 args->Add(StrDup(jsargs[j]));
268 // Helper function to parse flags: Takes an argument arg and splits it into
269 // a flag name and flag value (or NULL if they are missing). is_bool is set
270 // if the arg started with "-no" or "--no". The buffer may be used to NUL-
271 // terminate the name, it must be large enough to hold any possible name.
272 static void SplitArgument(const char* arg,
282 if (arg != NULL && *arg == '-') {
283 // find the begin of the flag name
284 arg++; // remove 1st '-'
286 arg++; // remove 2nd '-'
287 if (arg[0] == '\0') {
288 const char* kJSArgumentsFlagName = "js_arguments";
289 *name = kJSArgumentsFlagName;
293 if (arg[0] == 'n' && arg[1] == 'o') {
294 arg += 2; // remove "no"
299 // find the end of the flag name
300 while (*arg != '\0' && *arg != '=')
303 // get the value if any
305 // make a copy so we can NUL-terminate flag name
306 size_t n = arg - *name;
307 CHECK(n < static_cast<size_t>(buffer_size)); // buffer is too small
308 memcpy(buffer, *name, n);
318 inline char NormalizeChar(char ch) {
319 return ch == '_' ? '-' : ch;
323 static bool EqualNames(const char* a, const char* b) {
324 for (int i = 0; NormalizeChar(a[i]) == NormalizeChar(b[i]); i++) {
333 static Flag* FindFlag(const char* name) {
334 for (size_t i = 0; i < num_flags; ++i) {
335 if (EqualNames(name, flags[i].name()))
343 int FlagList::SetFlagsFromCommandLine(int* argc,
347 for (int i = 1; i < *argc;) {
349 const char* arg = argv[i++];
351 // split arg into flag components
356 SplitArgument(arg, buffer, sizeof buffer, &name, &value, &is_bool);
360 Flag* flag = FindFlag(name);
363 // We don't recognize this flag but since we're removing
364 // the flags we recognize we assume that the remaining flags
365 // will be processed somewhere else so this flag might make
369 fprintf(stderr, "Error: unrecognized flag %s\n"
370 "Try --help for options\n", arg);
375 // if we still need a flag value, use the next argument if available
376 if (flag->type() != Flag::TYPE_BOOL &&
377 flag->type() != Flag::TYPE_ARGS &&
382 fprintf(stderr, "Error: missing value for flag %s of type %s\n"
383 "Try --help for options\n",
384 arg, Type2String(flag->type()));
390 char* endp = const_cast<char*>(""); // *endp is only read
391 switch (flag->type()) {
392 case Flag::TYPE_BOOL:
393 *flag->bool_variable() = !is_bool;
396 *flag->int_variable() = strtol(value, &endp, 10); // NOLINT
398 case Flag::TYPE_FLOAT:
399 *flag->float_variable() = strtod(value, &endp);
401 case Flag::TYPE_STRING:
402 flag->set_string_value(value ? StrDup(value) : NULL, true);
404 case Flag::TYPE_ARGS: {
405 int start_pos = (value == NULL) ? i : i - 1;
406 int js_argc = *argc - start_pos;
407 const char** js_argv = NewArray<const char*>(js_argc);
409 js_argv[0] = StrDup(value);
411 for (int k = i; k < *argc; k++) {
412 js_argv[k - start_pos] = StrDup(argv[k]);
414 *flag->args_variable() = JSArguments::Create(js_argc, js_argv);
415 i = *argc; // Consume all arguments
421 if ((flag->type() == Flag::TYPE_BOOL && value != NULL) ||
422 (flag->type() != Flag::TYPE_BOOL && is_bool) ||
424 fprintf(stderr, "Error: illegal value for flag %s of type %s\n"
425 "Try --help for options\n",
426 arg, Type2String(flag->type()));
430 // remove the flag & value from the command
439 // shrink the argument list
442 for (int i = 1; i < *argc; i++) {
453 // parsed all flags successfully
458 static char* SkipWhiteSpace(char* p) {
459 while (*p != '\0' && isspace(*p) != 0) p++;
464 static char* SkipBlackSpace(char* p) {
465 while (*p != '\0' && isspace(*p) == 0) p++;
471 int FlagList::SetFlagsFromString(const char* str, int len) {
472 // make a 0-terminated copy of str
473 ScopedVector<char> copy0(len + 1);
474 memcpy(copy0.start(), str, len);
477 // strip leading white space
478 char* copy = SkipWhiteSpace(copy0.start());
480 // count the number of 'arguments'
481 int argc = 1; // be compatible with SetFlagsFromCommandLine()
482 for (char* p = copy; *p != '\0'; argc++) {
483 p = SkipBlackSpace(p);
484 p = SkipWhiteSpace(p);
487 // allocate argument array
488 ScopedVector<char*> argv(argc);
490 // split the flags string into arguments
491 argc = 1; // be compatible with SetFlagsFromCommandLine()
492 for (char* p = copy; *p != '\0'; argc++) {
494 p = SkipBlackSpace(p);
495 if (*p != '\0') *p++ = '\0'; // 0-terminate argument
496 p = SkipWhiteSpace(p);
500 int result = SetFlagsFromCommandLine(&argc, argv.start(), false);
507 void FlagList::ResetAllFlags() {
508 for (size_t i = 0; i < num_flags; ++i) {
515 void FlagList::PrintHelp() {
517 printf(" shell [options] -e string\n");
518 printf(" execute string in V8\n");
519 printf(" shell [options] file1 file2 ... filek\n");
520 printf(" run JavaScript scripts in file1, file2, ..., filek\n");
521 printf(" shell [options]\n");
522 printf(" shell [options] --shell [file1 file2 ... filek]\n");
523 printf(" run an interactive JavaScript shell\n");
524 printf(" d8 [options] file1 file2 ... filek\n");
525 printf(" d8 [options]\n");
526 printf(" d8 [options] --shell [file1 file2 ... filek]\n");
527 printf(" run the new debugging shell\n\n");
528 printf("Options:\n");
529 for (size_t i = 0; i < num_flags; ++i) {
531 SmartArrayPointer<const char> value = ToString(f);
532 printf(" --%s (%s)\n type: %s default: %s\n",
533 f->name(), f->comment(), Type2String(f->type()), *value);
538 void FlagList::EnforceFlagImplications() {
539 #define FLAG_MODE_DEFINE_IMPLICATIONS
540 #include "flag-definitions.h"
543 } } // namespace v8::internal