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require 'set'
module RubyVM::MJIT
class Invariants
# @param cb [CodeBlock]
# @param ocb [CodeBlock]
# @param exit_compiler [RubyVM::MJIT::ExitCompiler]
def initialize(cb, ocb, exit_compiler)
@cb = cb
@ocb = ocb
@exit_compiler = exit_compiler
@bop_blocks = Set.new # TODO: actually invalidate this
@cme_blocks = Hash.new { |h, k| h[k] = Set.new }
invariants = self
hooks = Module.new
hooks.define_method(:on_cme_invalidate) do |cme|
invariants.on_cme_invalidate(cme)
end
Hooks.singleton_class.prepend(hooks)
end
# @param jit [RubyVM::MJIT::JITState]
# @param klass [Integer]
# @param op [Integer]
def assume_bop_not_redefined(jit, klass, op)
return false unless C.BASIC_OP_UNREDEFINED_P(klass, op)
ensure_block_entry_exit(jit.block, cause: 'assume_bop_not_redefined')
@bop_blocks << jit.block
true
end
# @param jit [RubyVM::MJIT::JITState]
def assume_method_lookup_stable(jit, cme)
ensure_block_entry_exit(jit.block, cause: 'assume_method_lookup_stable')
@cme_blocks[cme.to_i] << jit.block
end
def on_cme_invalidate(cme)
@cme_blocks.fetch(cme.to_i, []).each do |block|
@cb.with_write_addr(block.start_addr) do
asm = Assembler.new
asm.comment('on_cme_invalidate')
asm.jmp(block.entry_exit)
@cb.write(asm)
end
# TODO: re-generate branches that refer to this block
end
end
private
# @param block [RubyVM::MJIT::Block]
def ensure_block_entry_exit(block, cause:)
if block.entry_exit.nil?
block.entry_exit = Assembler.new.then do |asm|
@exit_compiler.compile_entry_exit(block.pc, block.ctx, asm, cause:)
@ocb.write(asm)
end
end
end
end
end
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