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The following changes (change numbers refer to perforce) were
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made from version 3.1.1 to 3.1.2
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Runtime
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-------
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Change 5641 on 2009/02/20 by jimi@jimi.jimi.antlr3
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Release version 3.1.2 of the ANTLR C runtime.
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Updated documents and release notes will have to follow later.
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Change 5639 on 2009/02/20 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-356
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Ensure that code generation for C++ does not require casts
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Change 5577 on 2009/02/12 by jimi@jimi.jimi.antlr3
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C Runtime - Bug fixes.
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o Having moved to use an extract directly from a vector for returning
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tokens, it exposed a
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bug whereby the EOF boudary calculation in tokLT was incorrectly
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checking > rather than >=.
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o Changing to API initialization of tokens rather than memcmp()
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incorrectly forgot to set teh input stream pointer for the
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manufactured tokens in the token factory;
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o Rewrite streams for rewriting tree parsers did not check whether the
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rewrite stream was ever assigned before trying to free it, it is now
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in line with the ordinary parser code.
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Change 5576 on 2009/02/11 by jimi@jimi.jimi.antlr3
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C Runtime: Ensure that when we manufacture a new token for a missing
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token, that the user suplied custom information (if any) is copied
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from the current token.
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Change 5575 on 2009/02/08 by jimi@jimi.jimi.antlr3
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C Runtime - Vastly improve the reuse of allocated memory for nodes in
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tree rewriting.
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A problem for all targets at the moment si that the rewrite logic
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generated by ANTLR makes no attempt
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to reuse any resources, it merely gurantees that the tree shape at the
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end is correct. To some extent this is mitigated by the garbage
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collection systems of Java and .Net, even thoguh it is still an overhead to
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keep creating so many modes.
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This change implements the first of two C runtime changes that make
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best efforst to track when a node has become orphaned and will never
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be reused, based on inherent knowledge of the rewrite logic (which in
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the long term is not a great soloution).
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Much of the rewrite logic consists of creating a niilnode into which
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child nodes are appended. At: rulePost processing time; when a rewrite
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stream is closed; and when becomeRoot is called, there are many situations
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where the root of the tree that will be manipulted, or is finished with
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(in the case of rewrtie streams), where the nilNode was just a temporary
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creation for the sake of the rewrite itself.
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In these cases we can see that the nilNode would just be left ot rot in
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the node factory that tracks all the tree nodes.
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Rather than leave these in the factory to rot, we now keep a resuse
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stck and always reuse any node on this
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stack before claimin a new node from the factory pool.
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This single change alone reduces memory usage in the test case (20,604
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line C program and a GNU C parser)
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from nearly a GB, to 276MB. This is still way more memory than we
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shoudl need to do this operation, even on such a large input file,
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but the reduction results in a huge performance increase and greatly
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reduced system time spent on allocations.
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After this optimizatoin, comparison with gcc yeilds:
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time gcc -S a.c
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a.c:1026: warning: conflicting types for built-in function ‘vsprintf’
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a.c:1030: warning: conflicting types for built-in function ‘vsnprintf’
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a.c:1041: warning: conflicting types for built-in function ‘vsscanf’
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0.21user 0.01system 0:00.22elapsed 97%CPU (0avgtext+0avgdata 0maxresident)k
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0inputs+240outputs (0major+8345minor)pagefaults 0swaps
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and
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time ./jimi
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Reading a.c
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0.28user 0.11system 0:00.39elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
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0inputs+0outputs (0major+66609minor)pagefaults 0swaps
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And we can now interpolate the fact that the only major differnce is
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now the huge disparity in memory allocations. A
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future optimization of vector pooling, to sepate node resue from vector
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reuse, currently looks promising for further reuse of memory.
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Finally, a static analysis of the rewrte code, plus a realtime analysis
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of the heap at runtime, may well give us a reasonable memory usage
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pattern. In reality though, it is the generated rewrite logic
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that must becom optional at not continuously rewriting things that it
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need not, as it ascends the rule chain.
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Change 5563 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Allow rewrite streams to use the base adaptors vector factory and not
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try to malloc new vectors themselves.
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Change 5562 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Don't use CALLOC to allocate tree pools, use malloc as there is no need
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for calloc.
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Change 5561 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Prevent warnigsn about retval.stop not being initialized when a rule
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returns eraly because it is in backtracking mode
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Change 5558 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Lots of optimizations (though the next one to be checked in is the huge
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win) for AST building and vector factories.
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A large part of tree rewriting was the creation of vectors to hold AST
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nodes. Although I had created a vector factory, for some reason I never got
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around to creating a proper one, that pre-allocated the vectors in chunks and
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so on. I guess I just forgot to. Hence a big win here is prevention of calling
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malloc lots and lots of times to create vectors.
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A second inprovement was to change teh vector definition such that it
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holds a certain number of elements wihtin the vector structure itself, rather
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than malloc and freeing these. Currently this is set to 8, but may increase.
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For AST construction, this is generally a big win because AST nodes don't often
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have many individual children unless there has not been any shaping going on in
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the parser. But if you are not shaping, then you don't really need a tree.
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Other perforamnce inprovements here include not calling functions
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indirectly within token stream and common token stream. Hence tokens are
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claimed directly from the vectors. Users can override these funcitons of course
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and all this means is that if you override tokenstreams then you pretty much
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have to provide all the mehtods, but then I think you woudl have to anyway (and
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I don't know of anyone that has wanted to do this as you can carry your own
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structure around with the tokens anyway and that is much easier).
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Change 5555 on 2009/01/26 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-288
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Correct the interpretation of the skip token such that channel, start
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index, char pos in lie, start line and text are correctly reset to the start of
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the new token when the one that we just traversed was marked as being skipped.
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This correctly excludes the text that was matched as part of the
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SKIP()ed token from the next token in the token stream and so has the side
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effect that asking for $text of a rule no longer includes the text that shuodl
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be skipped, but DOES include the text of tokens that were merely placed off the
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default channel.
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Change 5551 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-287
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Most of the source files did not include the BSD license. THis might
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not be that big a deal given that I don't care what people do with it
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other than take my name off it, but having the license reproduced
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everywhere
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at least makes things perfectly clear. Hence this mass change of
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sources and templates
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to include the license.
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Change 5550 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-365
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Ensure that as soon as we known about an input stream on the lexer that
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we borrow its string factroy adn use it in our EOF token in case
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anyone tries to make it a string, such as in error messages for
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instance.
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Change 5548 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-363
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At some point the Java runtime default changed from discarding offchannel
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tokens to preserving them. The fix is to make the C runtime also
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default to preserving off-channel tokens.
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Change 5544 on 2009/01/24 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-360
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Ensure that the fillBuffer funtiion does not call any methods
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that require the cached buffer size to be recorded before we
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have actually recorded it.
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Change 5543 on 2009/01/24 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-362
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Some users have started using string factories themselves and
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exposed a flaw in the destroy method, that is intended to remove
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a strng htat was created by the factory and is no longer needed.
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The string was correctly removed from the vector that tracks them
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but after the first one, all the remaining strings are then numbered
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incorrectly. Hence the destroy method has been recoded to reindex
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the strings in the factory after one is removed and everythig is once
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more hunky dory.
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User suggested fix rejected.
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Change 5542 on 2009/01/24 by jimi@jimi.jimi.antlr3
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Fixed ANTLR-366
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The recognizer state now ensures that all fields are set to NULL upon
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creation
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and the reset does not overwrite the tokenname array
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Change 5527 on 2009/01/15 by jimi@jimi.jimi.antlr3
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Add the C runtime for 3.1.2 beta2 to perforce
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Change 5526 on 2009/01/15 by jimi@jimi.jimivista.antlr3
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Correctly define the MEMMOVE macro which was inadvertently left to be
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memcpy.
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Change 5503 on 2008/12/12 by jimi@jimi.jimi.antlr3
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Change C runtime release number to 3.1.2 beta
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Change 5473 on 2008/12/01 by jimi@jimi.jimivista.antlr3
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Fixed: ANTLR-350 - C runtime use of memcpy
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Prior change to use memcpy instead of memmove in all cases missed the
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fact that the string factory can be in a situation where overlaps occur. We now
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have ANTLR3_MEMCPY and ANTLR3_MEMMOVE and use the two appropriately.
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Change 5471 on 2008/12/01 by jimi@jimi.jimivista.antlr3
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Fixed ANTLR-361
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- Ensure that ANTLR3_BOOLEAN is typedef'ed correctly when building for
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MingW
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Templates
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---------
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Change 5637 on 2009/02/20 by jimi@jimi.jimi.antlr3
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C rtunime - make sure that ADAPTOR results are cast to the tree type on
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a rewrite
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Change 5620 on 2009/02/18 by jimi@jimi.jimi.antlr3
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Rename/Move:
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From: //depot/code/antlr/main/src/org/antlr/codegen/templates/...
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To: //depot/code/antlr/main/src/main/resources/org/antlr/codegen/templates/...
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Relocate the code generating templates to exist in the directory set
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that maven expects.
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When checking in your templates, you may find it easiest to make a copy
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of what you have, revert the change in perforce, then just check out the
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template in the new location, and copy the changes back over. Nobody has oore
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than two files open at the moment.
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Change 5578 on 2009/02/12 by jimi@jimi.jimi.antlr3
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Correct the string template escape sequences for generating scope
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code in the C templates.
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Change 5577 on 2009/02/12 by jimi@jimi.jimi.antlr3
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C Runtime - Bug fixes.
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o Having moved to use an extract directly from a vector for returning
|
|
|
tokens, it exposed a
|
|
|
bug whereby the EOF boudary calculation in tokLT was incorrectly
|
|
|
checking > rather than
|
|
|
>=.
|
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o Changing to API initialization of tokens rather than memcmp()
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|
incorrectly forgot to
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|
set teh input stream pointer for the manufactured tokens in the
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token factory;
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o Rewrite streams for rewriting tree parsers did not check whether the
|
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rewrite stream
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was ever assigned before trying to free it, it is now in line with
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the ordinary parser code.
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Change 5567 on 2009/01/29 by jimi@jimi.jimi.antlr3
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C Runtime - Further Optimizations
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Within grammars that used scopes and were intended to parse large
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inputs with many rule nests,
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the creation anf deletion of the scopes themselves became significant.
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Careful analysis shows that
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for most grammars, while a parse could create and delete 20,000 scopes,
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the maxium depth of
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any scope was only 8.
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This change therefore changes the scope implementation so that it does
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not free scope memory when
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it is popped but just tracks it in a C runtime stack, eventually
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freeing it when the stack is freed. This change
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caused the allocation of only 12 scope structures instead of 20,000 for
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the extreme example case.
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This change means that scope users must be carefule (as ever in C) to
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initializae their scope elements
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correctly as:
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1) If not you may inherit values from a prior use of the scope
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structure;
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2) SCope structure are now allocated with malloc and not calloc;
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Also, when using a custom free function to clean a scope when it is
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popped, it is probably a good idea
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to set any free'd pointers to NULL (this is generally good C programmig
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practice in any case)
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Change 5566 on 2009/01/29 by jimi@jimi.jimi.antlr3
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Remove redundant BACKTRACK checking so that MSVC9 does not get confused
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about possibly uninitialized variables
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Change 5565 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Use malloc rather than calloc to allocate memory for new scopes. Note
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that this means users will have to be careful to initialize any values in their
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scopes that they expect to be 0 or NULL and I must document this.
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Change 5564 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Use malloc rather than calloc for copying list lable tokens for
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rewrites.
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Change 5561 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Prevent warnigsn about retval.stop not being initialized when a rule
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returns eraly because it is in backtracking mode
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Change 5560 on 2009/01/28 by jimi@jimi.jimi.antlr3
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Add a NULL check before freeing rewrite streams used in AST rewrites
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rather than auto-rewrites.
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While the NULL check is redundant as the free cannot be called unless
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it is assigned, Visual Studio C 2008
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gets it wrong and thinks that there is a PATH than can arrive at the
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free wihtout it being assigned and that is too annoying to ignore.
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Change 5559 on 2009/01/28 by jimi@jimi.jimi.antlr3
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C target Tree rewrite optimization
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There is only one optimization in this change, but it is a huge one.
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The code generation templates were set up so that at the start of a rule,
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any rewrite streams mentioned in the rule wer pre-created. However, this
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is a massive overhead for rules where only one or two of the streams are
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|
actually used, as we create them then free them without ever using them.
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This was copied from the Java templates basically.
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This caused literally millions of extra calls and vector allocations
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|
in the case of the GNU C parser given to me for testing with a 20,000
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line program.
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After this change, the following comparison is avaiable against the gcc
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compiler:
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Before (different machines here so use the relative difference for
|
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|
comparison):
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gcc:
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real 0m0.425s
|
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user 0m0.384s
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sys 0m0.036s
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ANTLR C
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real 0m1.958s
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user 0m1.284s
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sys 0m0.656s
|
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After the previous optimizations for vector pooling via a factory,
|
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plus this huge win in removing redundant code, we have the following
|
|
|
(different machine to the one above):
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gcc:
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|
0.21user 0.01system 0:00.23elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
|
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0inputs+328outputs (0major+9922minor)pagefaults 0swaps
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ANTLR C:
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0.37user 0.26system 0:00.64elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
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0inputs+0outputs (0major+130944minor)pagefaults 0swaps
|
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The extra system time coming from the fact that although the tree
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rewriting is now optimal in terms of not allocating things it does
|
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|
not need, there is still a lot more overhead in a parser that is generated
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|
for generic use, including much more use of structures for tokens and extra
|
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|
copying and so on. I will
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continue to work on improviing things where I can, but the next big
|
|
|
improvement will come from Ter's optimization of the actual code structures we
|
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|
generate including not doing things with rewrite streams that we do not need to
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do at all.
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The second machine I used is about twice as fast CPU wise as the system
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|
that was used originally by the user that asked about this performance.
|
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Change 5558 on 2009/01/28 by jimi@jimi.jimi.antlr3
|
|
|
|
|
|
Lots of optimizations (though the next one to be checked in is the huge
|
|
|
win) for AST building and vector factories.
|
|
|
|
|
|
A large part of tree rewriting was the creation of vectors to hold AST
|
|
|
nodes. Although I had created a vector factory, for some reason I never got
|
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around to creating a proper one, that pre-allocated the vectors in chunks and
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so on. I guess I just forgot to. Hence a big win here is prevention of calling
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malloc lots and lots of times to create vectors.
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A second inprovement was to change teh vector definition such that it
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holds a certain number of elements wihtin the vector structure itself, rather
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than malloc and freeing these. Currently this is set to 8, but may increase.
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For AST construction, this is generally a big win because AST nodes don't often
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have many individual children unless there has not been any shaping going on in
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the parser. But if you are not shaping, then you don't really need a tree.
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Other perforamnce inprovements here include not calling functions
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indirectly within token stream and common token stream. Hence tokens are
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claimed directly from the vectors. Users can override these funcitons of course
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and all this means is that if you override tokenstreams then you pretty much
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have to provide all the mehtods, but then I think you woudl have to anyway (and
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I don't know of anyone that has wanted to do this as you can carry your own
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structure around with the tokens anyway and that is much easier).
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Change 5554 on 2009/01/26 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-379
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For some reason in the past, the ruleMemozation() template had required
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that the name parameter be set to the rule name. This does not seem to be a
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requirement any more. The name=xxx override when invoking the template was
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causing all the scope names derived when cleaning up in memoization to be
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called after the rule name, which was not correct. Howver, this only affected
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the output when in output=AST mode.
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This template invocation is now corrected.
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Change 5553 on 2009/01/26 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-330
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Managed to get the one rule that could not see the ASTLabelType to call
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back in to the super template C.stg and ask it to construct hte name. I am not
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100% sure that this fixes all cases, but I cannot find any that fail. PLease
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let me know if you find any exampoles of being unable to default the
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ASTLabelType option in the C target.
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Change 5552 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Progress: ANTLR-327
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Fix debug code generation templates when output=AST such that code
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can at least be generated and I can debug the output code correctly.
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Note that this checkin does not implement the debugging requirements
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for tree generating parsers.
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Change 5551 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-287
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Most of the source files did not include the BSD license. THis might
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not be that big a deal given that I don't care what people do with it
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other than take my name off it, but having the license reproduced
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everywhere at least makes things perfectly clear. Hence this mass change of
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sources and templates to include the license.
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Change 5549 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-354
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Using 0.0D as the default initialize value for a double caused
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VS 2003 C compiler to bomb out. There seesm to be no reason other
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than force of habit to set this to 0.0D so I have dropped the D so
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that older compilers do not complain.
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Change 5547 on 2009/01/25 by jimi@jimi.jimi.antlr3
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Fixed: ANTLR-282
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All references are now unadorned with any type of NULL check for the
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following reasons:
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|
1) A NULL reference means that there is a problem with the
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grammar and we need the program to fail immediately so
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|
that the programmer can work out where the problem occured;
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2) Most of the time, the only sensible value that can be
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returned is NULL or 0 which
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|
obviates the NULL check in the first place;
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|
3) If we replace a NULL reference with some value such as 0,
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|
then the program may blithely continue but just do something
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logically wrong, which will be very difficult for the
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grammar programmer to detect and correct.
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Change 5545 on 2009/01/24 by jimi@jimi.jimi.antlr3
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|
Fixed: ANTLR-357
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|
The bug report was correct in that the types of references to things
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|
like $start were being incorrectly cast as they wer not changed from
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|
Java style casts (and the casts are unneccessary). this is now fixed
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|
and references are referencing the correct, uncast, types.
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|
However, the bug report was wrong in that the reference in the bok to
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|
$start.pos will only work for Java and really, it is incorrect in the
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|
book because it shoudl not access the .pos member directly but shudl
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|
|
be using $start.getCharPositionInLine().
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|
Because there is no access qualification in C, one could use
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|
$start.charPosition, however
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|
really this should be $start->getCharPositionInLine($start);
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Change 5541 on 2009/01/24 by jimi@jimi.jimi.antlr3
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|
Fixed - ANTLR-367
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|
The code generation for the free method of a recognizer was not
|
|
|
distinguishing tree parsers from parsers when it came to calling delegate free
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|
|
functions.
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|
This is now corrected.
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Change 5540 on 2009/01/24 by jimi@jimi.jimi.antlr3
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|
Fixed ANTLR-355
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|
|
Ensure that we do not attempt to free any memory that we did not
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|
|
actually allocate because the parser rule was being executed in
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|
backtracking mode.
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Change 5539 on 2009/01/24 by jimi@jimi.jimivista.antlr3
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|
Fixed: ANTLR-355
|
|
|
When a C targetted parser is producing in backtracking mode, then the
|
|
|
creation of new stream rewrite structures shoudl not happen if the rule is
|
|
|
currently backtracking
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|
Change 5502 on 2008/12/11 by jimi@jimi.jimi.antlr3
|
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|
Fixed: ANTLR-349 Ensure that all marker labels in the lexer are 64 bit
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|
compatible
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Change 5473 on 2008/12/01 by jimi@jimi.jimivista.antlr3
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|
|
Fixed: ANTLR-350 - C runtime use of memcpy
|
|
|
Prior change to use memcpy instead of memmove in all cases missed the
|
|
|
fact that the string factory can be in a situation where overlaps occur. We now
|
|
|
have ANTLR3_MEMCPY and ANTLR3_MEMMOVE and use the two appropriately.
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Change 5387 on 2008/11/05 by parrt@parrt.spork
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|
Fixed x+=. issue with tree grammars; added unit test
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Change 5325 on 2008/10/23 by parrt@parrt.spork
|
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|
We were all ref'ing backtracking==0 hardcoded instead checking the
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|
|
@synpredgate action.
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