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module RubyVM::MJIT
class ExitCompiler
def initialize = freeze
# @param jit [RubyVM::MJIT::JITState]
# @param ctx [RubyVM::MJIT::Context]
# @param asm [RubyVM::MJIT::X86Assembler]
def compile_exit(jit, ctx, asm)
if C.mjit_opts.stats
insn = decode_insn(C.VALUE.new(jit.pc).*)
asm.comment("increment insn exit: #{insn.name}")
asm.mov(:rax, (C.mjit_insn_exits + insn.bin).to_i)
asm.add([:rax], 1) # TODO: lock
end
asm.comment("exit to interpreter")
# Update pc
asm.mov(:rax, jit.pc) # rax = jit.pc
asm.mov([CFP, C.rb_control_frame_t.offsetof(:pc)], :rax) # cfp->pc = rax
# Update sp
if ctx.stack_size > 0
asm.add(SP, C.VALUE.size * ctx.stack_size) # rbx += stack_size
asm.mov([CFP, C.rb_control_frame_t.offsetof(:sp)], SP) # cfp->sp = rbx
end
# Restore callee-saved registers
asm.pop(SP)
asm.mov(:rax, Qundef)
asm.ret
end
end
end
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