10 Commits (7134b09e502ca2ff17b165e72b04e88f7973fbab)

Author SHA1 Message Date
David Majda 7134b09e50 Merge |allocateRegisters| and |computeParams| passes
The purpose of this change is to avoid the need to index register
variables storing match results of sequences whose elements are labeled.
The indexing happened when match results of labeled elements were passed
to action/predicate functions.

In order to avoid indexing, the register allocator needs to ensure that
registers storing match results of any labeled sequence elements are
still "alive" after finishing parsing of the sequence. They should not
be used to store anything else at least until code of all actions and
predicates that can see the labels is executed. This requires that the
|allocateRegisters| pass has the knowledge of scoping. Because that
knowledge was already implicitly embedded in the |coputeParams| pass,
the logical step to prevent duplication was to merge it with the
|allocateRegisters| pass. This is what this commit does.

As a part of the merge the tests of both passes were largely refactored.
This is both to accomodate the merge and to make the tests in sync with
the code again (the tests became a bit out-of-sync during the last few
commits -- they tested more than was needed).

The speed/size impact is slightly positive:

Speed impact
------------
Before:     849.86 kB/s
After:      858.16 kB/s
Difference: 0.97%

Size impact
-----------
Before:     876618 b
After:      875602 b
Difference: -0.12%

(Measured by /tools/impact with Node.js v0.6.18 on x86_64 GNU/Linux.)
12 years ago
David Majda 2d36ebeb59 Mental model change: Variables do not form a stack, they are registers
This commit changes the model underlying parser variables used to store
match results and parse positions. Until now they were treated as a
stack, now they are thought of as registers. The actual behavior does
not change (yet), only the terminology.

More specifically, this commit:

  * Changes parser variable names from |result0|, |result1|, etc. to
    |r0|, |r1|, etc.

  * Changes various internal names and comments to match the new model.

  * Renames the |computeVarIndices| pass to |allocateRegisters|.
12 years ago
David Majda 2c8b323ade Replace variable name computations by computations of indices
This commit replaces all variable name computations in |computeVarNames|
and |computeParams| passes by computations of indices. The actual names
are computed later in the |generateCode| pass.

This change makes the code generator the only place that deals with the
actual variable names, making them easier to change for example.

The code generator code seems bit more complicated after the change, but
this complexity will pay off (and mostly disappear) later.
12 years ago
David Majda 8ef5f08c90 Jasmine: Convert |removeProxyRules| compiler pass tests 12 years ago
David Majda eaf2af8e7b Jasmine: Convert |computeParams| compiler pass tests 12 years ago
David Majda 4edc9982cc Jasmine: Convert |computeVarNames| compiler pass tests 12 years ago
David Majda 1471df9a69 Jasmine: Convert |reportLeftRecursion| compiler pass tests 12 years ago
David Majda 2889ca72fc Jasmine: Convert |reportMissingRules| compiler pass tests 12 years ago
David Majda ec48742032 Jasmine: Convert literal matching tests 12 years ago
David Majda c27b96051a Jasmine: Initial infrastructure
This is the first of many commits that gradually convert PEG.js's test
suite from QUnit to Jasmine, cleaning it up on the way.

Main reason for the change is that Jasmine allows nested contexts,
allowing to structure the tests in a better way than QUnit. Moreover,
the tests needed to be cleaned up a bit.
12 years ago