• Milad Fa's avatar
    PPC/s390: [regexp] Compact codegen for large character classes · 841d33a5
    Milad Fa authored
    Port 8bbb44e5
    
    Original Commit Message:
    
        Large character classes may easily be created when unicode
        properties (e.g.: /\p{L}/u and /\P{L}/u) are used - these are
        expanded internally into character classes that consist of hundreds
        of character ranges. Previously to this CL, we'd emit branching code
        for each of these ranges, leading to very large regexp code objects.
    
        This CL adds a new codegen mode for large character classes (where
        'large' currently means > 16 ranges). Instead of emitting branching
        code inline, the ranges are written into a ByteArray and we call into
        the C function IsCharacterInRangeArray for the actual branching logic.
        The ByteArray is smaller than emitted code and is deduplicated if the
        same character class is matched repeatedly in the same pattern.
    
        Note this mode is *not* implemented for the interpreter, since we
        currently don't have a constant pool for irregexp bytecode, and thus
        cannot reference ByteArrays.
    
    R=jgruber@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
    BUG=
    LOG=N
    
    Change-Id: I2ded01fa2767e56e72be81b949eefb5fb85b7013
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3231981Reviewed-by: 's avatarJunliang Yan <junyan@redhat.com>
    Commit-Queue: Milad Fa <mfarazma@redhat.com>
    Cr-Commit-Position: refs/heads/main@{#77473}
    841d33a5
regexp-macro-assembler-ppc.h 9.97 KB