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1 // Copyright 2006-2009 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2009 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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2349 | 2349 |
2350 return Smi::FromInt(str1_length - str2_length); | 2350 return Smi::FromInt(str1_length - str2_length); |
2351 } | 2351 } |
2352 | 2352 |
2353 | 2353 |
2354 static Object* Runtime_SubString(Arguments args) { | 2354 static Object* Runtime_SubString(Arguments args) { |
2355 NoHandleAllocation ha; | 2355 NoHandleAllocation ha; |
2356 ASSERT(args.length() == 3); | 2356 ASSERT(args.length() == 3); |
2357 | 2357 |
2358 CONVERT_CHECKED(String, value, args[0]); | 2358 CONVERT_CHECKED(String, value, args[0]); |
2359 CONVERT_DOUBLE_CHECKED(from_number, args[1]); | 2359 Object* from = args[1]; |
2360 CONVERT_DOUBLE_CHECKED(to_number, args[2]); | 2360 Object* to = args[2]; |
2361 if (from->IsSmi() && to->IsSmi()) { | |
Søren Thygesen Gjesse
2009/11/19 21:42:57
Maybe add a comment to this fast case.
| |
2362 int start = Smi::cast(from)->value(); | |
2363 int end = Smi::cast(to)->value(); | |
2361 | 2364 |
Søren Thygesen Gjesse
2009/11/19 21:42:57
Please move the declaration of start and end befor
| |
2362 int start = FastD2I(from_number); | 2365 RUNTIME_ASSERT(end >= start); |
2363 int end = FastD2I(to_number); | 2366 RUNTIME_ASSERT(start >= 0); |
2367 RUNTIME_ASSERT(end <= value->length()); | |
2368 return value->SubString(start, end); | |
2369 } else { | |
2370 CONVERT_DOUBLE_CHECKED(from_number, from); | |
2371 CONVERT_DOUBLE_CHECKED(to_number, to); | |
2364 | 2372 |
2365 RUNTIME_ASSERT(end >= start); | 2373 int start = FastD2I(from_number); |
2366 RUNTIME_ASSERT(start >= 0); | 2374 int end = FastD2I(to_number); |
2367 RUNTIME_ASSERT(end <= value->length()); | 2375 |
2368 return value->SubString(start, end); | 2376 RUNTIME_ASSERT(end >= start); |
2377 RUNTIME_ASSERT(start >= 0); | |
2378 RUNTIME_ASSERT(end <= value->length()); | |
2379 return value->SubString(start, end); | |
2380 } | |
2369 } | 2381 } |
2370 | 2382 |
2371 | 2383 |
2372 static Object* Runtime_StringMatch(Arguments args) { | 2384 static Object* Runtime_StringMatch(Arguments args) { |
2373 ASSERT_EQ(3, args.length()); | 2385 ASSERT_EQ(3, args.length()); |
2374 | 2386 |
2375 CONVERT_ARG_CHECKED(String, subject, 0); | 2387 CONVERT_ARG_CHECKED(String, subject, 0); |
2376 CONVERT_ARG_CHECKED(JSRegExp, regexp, 1); | 2388 CONVERT_ARG_CHECKED(JSRegExp, regexp, 1); |
2377 CONVERT_ARG_CHECKED(JSArray, regexp_info, 2); | 2389 CONVERT_ARG_CHECKED(JSArray, regexp_info, 2); |
2378 HandleScope handles; | 2390 HandleScope handles; |
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7903 } else { | 7915 } else { |
7904 // Handle last resort GC and make sure to allow future allocations | 7916 // Handle last resort GC and make sure to allow future allocations |
7905 // to grow the heap without causing GCs (if possible). | 7917 // to grow the heap without causing GCs (if possible). |
7906 Counters::gc_last_resort_from_js.Increment(); | 7918 Counters::gc_last_resort_from_js.Increment(); |
7907 Heap::CollectAllGarbage(false); | 7919 Heap::CollectAllGarbage(false); |
7908 } | 7920 } |
7909 } | 7921 } |
7910 | 7922 |
7911 | 7923 |
7912 } } // namespace v8::internal | 7924 } } // namespace v8::internal |
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