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When compiling with option HARDMEMTESTS, every creation of a new key
in a table forces an emergency GC.
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Memory is the resource we want to save. Still to be reviewed again.
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No warnings for standard numerical types. Still pending alternative
numerical types.
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Several definitions that don't need to be "global" (that is, that
concerns only specific parts of the code) moved out of llimits.h,
to more appropriate places.
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Corrections in comments and manual. Added note in the manual about
local variables in the REPL.
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- back with step size in collectgarbage("step")
- adjustments in defaults for some GC parameters
- adjustments in 'luaO_codeparam'
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The generational mode also uses the parameters for the incremental
mode in its major collections, so it should be easy to change those
parameters without having to change the GC mode.
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This encoding brings more precision and a larger range for these
parameters.
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It is simpler to use always 'setage'. The saving from 'changeage'
is too irrelevant.
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Plus other comments and small details.
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Reuse macros for objects when defining the macros for values.
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Positive debts seems more natural then negative ones.
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More uniformity when handling GC parameters + avoid divisions by 100
when applying them.
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Still needs to review generational mode.
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Using a version of 'luaC_newobj' that allows offsets (extra space
before the object itself).
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'os.exit' can call lua_close again, separating new finalizers
created after all previous finalizers were already separated.
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As the GC is not reentrant, finalizers should not be able to invoke it.
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- Macro 'gray2black' was renamed 'nw2black' (Non-White to black), as it
was already being used on objects that could be already black.
- Macros 'white2gray' and 'black2gray' were unified in 'set2gray'; no
reason to have two macros when one will do and, again, 'black2gray' was
already being used on objects that could be already gray.
Moreover, macros 'maskcolors' and 'maskgcbits' were negated to have
ones in the described bits, instead of zeros. (This naming seems more
intuitive.)
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Test uses an extra bit in 'marked' to mark all elements in gray lists
and then check against elements colored gray.
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Tables were using this bit to indicate their array sizes were real
('isrealasize'), but this bit can be useful for tests. Instead, they
can use bit 7 of their 'flag' field for that purpose. (There are only
six fast-access metamethods.) This 'flag' field only exists in tables,
so this use does not affect other types.
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Both when setting a path and searching for a file ('searchpath'),
this commit reduces the number of intermediate strings created
in Lua.
(For setting a path the change is not relevant, because this is
done only twice when loading the module. Anyway, it is a nice example
of how to use auxlib buffers to manipulate strings in the C API.)
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After a major bad collection (one that collects too few objects),
next collection will be major again. In that case, avoid switching
back to generational mode (as it will have to switch again to
incremental to do next major collection).
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The mechanism of "caching the last closure created for a prototype to
try to reuse it the next time a closure for that prototype is created"
was removed. There are several reasons:
- It is hard to find a natural example where this cache has a measurable
impact on performance.
- Programmers already perceive closure creation as something slow,
so they tend to avoid it inside hot paths. (Any case where the cache
could reuse a closure can be rewritten predefining the closure in some
variable and using that variable.)
- The implementation was somewhat complex, due to a bad interaction
with the generational collector. (Typically, new closures are new,
while prototypes are old. So, the cache breaks the invariant that
old objects should not point to new ones.)
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Version numbers and dates (mostly wrong) from RCS keyword strings
removed from all source files; only the file name are kept.
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Some simplifications (not counting bytes, couting only slots visited;
no more 'gcfinnum'); more GC parameters; using vararg in 'lua_gc' to
set parameters in different GC modes
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prototypes to have their caches visited again) + constant 'MAXMISS'
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of reference count (simpler and better for generational mode)
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(no need to convert to 'GCObject')
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