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57e806383c
Using a special value to indicate match failure instead of |null| allows actions to return |null| as a regular value. This simplifies e.g. the JSON parser. Note the special value is internal and intentionally undocumented. This means that there is currently no official way how to trigger a match failure from an action. This is a temporary state which will be fixed soon. The negative performance impact (see below) is probably caused by changing lot of comparisons against |null| (which likely check the value against a fixed constant representing |null| in the interpreter) to comparisons against the special value (which likely check the value against another value in the interpreter). Implements part of #198. Speed impact ------------ Before: 1146.82 kB/s After: 1031.25 kB/s Difference: -10.08% Size impact ----------- Before: 950817 b After: 973269 b Difference: 2.36% (Measured by /tools/impact with Node.js v0.6.18 on x86_64 GNU/Linux.) |
11 years ago | |
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| arithmetics.pegjs | 12 years ago | |
| css.pegjs | 12 years ago | |
| javascript.pegjs | 11 years ago | |
| json.pegjs | 11 years ago | |