class JITState < Struct.new(

:iseq, # @param `RubyVM::RJIT::CPointer::Struct_rb_iseq_t`

:pc, # @param [Integer] The JIT target PC

:cfp, # @param `RubyVM::RJIT::CPointer::Struct_rb_control_frame_t` The JIT source CFP (before RJIT is called)

:block, # @param [RubyVM::RJIT::Block]

:stack_size_for_pc, # @param [Integer]

:side_exit_for_pc, # @param [Hash{ Integer => Integer }] { sp_offset => address }

:record_boundary_patch_point, # @param [TrueClass,FalseClass]

)

def initialize(side_exit_for_pc: {}, record_boundary_patch_point: false, **) = super

def insn

Compiler.decode_insn(C.VALUE.new(pc).*)

end

def operand(index, signed: false, ruby: false)

addr = pc + (index + 1) * Fiddle::SIZEOF_VOIDP

value = Fiddle::Pointer.new(addr)[0, Fiddle::SIZEOF_VOIDP].unpack(signed ? 'q' : 'Q')[0]

if ruby

value = C.to_ruby(value)

end

value

end

def at_current_insn?

pc == cfp.pc.to_i

end

def peek_at_local(n)

local_table_size = iseq.body.local_table_size

offset = -C::VM_ENV_DATA_SIZE - local_table_size + n + 1

value = (cfp.ep + offset).*

C.to_ruby(value)

end

def peek_at_stack(depth_from_top)

raise 'not at current insn' unless at_current_insn?

offset = -(1 + depth_from_top)

# rb_rjit_branch_stub_hit updates SP, so you don't need to worry about sp_offset

value = (cfp.sp + offset).*

C.to_ruby(value)

end

def peek_at_self

C.to_ruby(cfp.self)

end

def peek_at_block_handler(level)

ep = ep_at_level(cfp, level:)

ep[C::VM_ENV_DATA_INDEX_SPECVAL]

end

private

def ep_at_level(cfp, level:)

ep = cfp.ep

level.times do

# VM_ENV_PREV_EP

ep = C.VALUE.new(ep[C::VM_ENV_DATA_INDEX_SPECVAL] & ~0x03)

end

ep

end

end