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New instruction format 'ivABC' (a variant of iABC where parameter vC has
10 bits) allows constructors of up to 1024 elements to be coded without
EXTRAARG.
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Instead of a fixed limit of 50 registers (which, in a bad worst case,
can limit the nesting of constructors to 5 levels), the compiler
computes an individual limit for each constructor based on how many
registers are available when it runs. This limit then controls the
frequency of SETLIST instructions.
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Plus, added a test to check that limit.
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(As the length of any string in Lua.)
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They don't need to be visible by clients of Lua.
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The definitions in llimits.h are useful not only for the core. That
header only defines types and '#define's, so libs and core still do
not share any real code/data.
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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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ISO C forbids assignment of a union field to another field of the same
union.
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Set errno to zero before calling any function where we may use its
errno, and check errno for zero before using it (as functions may not
set it even in error). The code assumes that no function will put
garbage on errno (although ISO C allows that): If any function during an
operation set errno, and the operation result in an error, assume that
errno has something to say.
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As the encoding of array indices is (~index), 0 is encoded as -1 and
INT_MAX is encoded as INT_MIN.
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Lua seg. faults when asked to create the 'activelines' table for a
vararg function with no debug information.
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Instead of listing what it does not accept, which is always relative.
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'utf8.offset' returns two values: the initial and the final position
of the given character.
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Corrections in comments and manual. Added note in the manual about
local variables in the REPL.
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The name 'getmode' conficts with a function from BSD, defined
in <unistd.h>. Although 'lbaselib.c' cannot include that header,
'onelua.c' can.
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This "linear" representation (see ltable.h for details) has worse
locality than cells, but the simpler access code seems to compensate
that.
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Instead of allways adding a prefix for the next message, and then
removing it if there is no message, add the prefix after each message.
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Bug introduced in 05932567.
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'unsigned int' is too long sometimes. (We already write 'long' instead
of 'long int'...)
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Undoing previous commit. Returning TValue increases code size without
any visible gains. Returning the tag is a little simpler than returning
a special code (HOK/HNOTFOUND) and the tag is useful by itself in
some cases.
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Instead of receiving a parameter telling them where to put the result
of the query, these functions return the TValue directly. (That is,
they return a structure.)
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Negligible performance gains don't justify extra complexity.
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A few operations on arrays can be performed "in bulk", treating all
tags of a cell as a simple (or a few) word(s).
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- 'unsigned int' -> 'unsigned'
- Some explicit casts to avoid warnings
- Test avoids printing the value of 'fail' (which may not be nil)
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size_t should be big enough to count the number of strings in a dump.
(And, by definition, it is big enough to count the length of each
string.)
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Instead of preloading all non-loaded libraries, there is another
mask to select which libraries to preload.
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- Usign lua_Unsigned to count strings.
- Varint uses a type large enough both for size_t and lua_Unsigned.
- Most-Significant Bit 0 means last byte, to conform to common usage.
- (unrelated) Change in macro 'getaddr' so that multiplication is
by constants.
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Due to allignment, it is already using the space of a pointer, and
a pointer generates slightly simpler code.
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Avoid silent conversions from int to unsigned int when calling
'luaH_resize'; avoid silent conversions from lua_Integer to int in
'table.create'; MAXASIZE corrected for the new implementation of arrays;
'luaH_resize' checks explicitly whether new size respects MAXASIZE.
(Even constructors were bypassing that check.)
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It is quite common to write to empty but existing cells in the array
part of a table, so 'luaH_psetint' checks for the common case that
the table doesn't have a newindex metamethod to complete the write.
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Creates a table preallocating memory. (It just exports to Lua the API
function 'lua_createtable'.)
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The reference system has a defined way to add initial values to the
table where it operates.
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That constant was already deprecated (see commit 6aabf4b15e7).
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'lua_rawgeti' now uses "fast track"; 'lua_rawseti' still calls
'luaH_setint', but the latter was recoded to avoid extra overhead
when writing to the array part after 'alimit'.
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Yielding in a hook must decrease the program counter, because it already
counted an instruction that, in the end, was not executed. However,
that decrement should be done only when about to restart the thread.
Otherwise, inspecting the thread with the debug library shows it one
instruction behind of where it really is.
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