def invalidate_loop(self, looptoken):
"""Activate all GUARD_NOT_INVALIDATED in the loop and its attached
bridges. Before this call, all GUARD_NOT_INVALIDATED do nothing;
after this call, they all fail. Note that afterwards, if one such
guard fails often enough, it has a bridge attached to it; it is
possible then to re-call invalidate_loop() on the same looptoken,
which must invalidate all newer GUARD_NOT_INVALIDATED, but not the
old one that already has a bridge attached to it."""
for jmp, tgt in looptoken.compiled_loop_token.invalidate_positions:
mc = InstrBuilder()
# needs 4 bytes, ensured by the previous process
mc.b_offset(tgt) # a single instruction
mc.copy_to_raw_memory(jmp)
# positions invalidated
looptoken.compiled_loop_token.invalidate_positions = []
def redirect_call_assembler(self, oldlooptoken, newlooptoken):
# some minimal sanity checking
old_nbargs = oldlooptoken.compiled_loop_token._debug_nbargs
new_nbargs = newlooptoken.compiled_loop_token._debug_nbargs
assert old_nbargs == new_nbargs
oldadr = oldlooptoken._ll_function_addr
target = newlooptoken._ll_function_addr
# copy frame-info data
baseofs = self.cpu.get_baseofs_of_frame_field()
newlooptoken.compiled_loop_token.update_frame_info(oldlooptoken.compiled_loop_token, baseofs)
# we overwrite the instructions at the old _ll_function_addr
# to start with a JMP to the new _ll_function_addr.
mc = InstrBuilder()
mc.load_imm(r.SCRATCH, target)
mc.BCR(c.ANY, r.SCRATCH)
mc.copy_to_raw_memory(oldadr)
def redirect_call_assembler(self, oldlooptoken, newlooptoken):
# some minimal sanity checking
old_nbargs = oldlooptoken.compiled_loop_token._debug_nbargs
new_nbargs = newlooptoken.compiled_loop_token._debug_nbargs
assert old_nbargs == new_nbargs
oldadr = oldlooptoken._ll_function_addr
target = newlooptoken._ll_function_addr
# copy frame-info data
baseofs = self.cpu.get_baseofs_of_frame_field()
newlooptoken.compiled_loop_token.update_frame_info(
oldlooptoken.compiled_loop_token, baseofs)
# we overwrite the instructions at the old _ll_function_addr
# to start with a JMP to the new _ll_function_addr.
mc = InstrBuilder()
mc.load_imm(r.SCRATCH, target)
mc.BCR(c.ANY, r.SCRATCH)
mc.copy_to_raw_memory(oldadr)
def invalidate_loop(self, looptoken):
"""Activate all GUARD_NOT_INVALIDATED in the loop and its attached
bridges. Before this call, all GUARD_NOT_INVALIDATED do nothing;
after this call, they all fail. Note that afterwards, if one such
guard fails often enough, it has a bridge attached to it; it is
possible then to re-call invalidate_loop() on the same looptoken,
which must invalidate all newer GUARD_NOT_INVALIDATED, but not the
old one that already has a bridge attached to it."""
for jmp, tgt in looptoken.compiled_loop_token.invalidate_positions:
mc = InstrBuilder()
# needs 4 bytes, ensured by the previous process
mc.b_offset(tgt) # a single instruction
mc.copy_to_raw_memory(jmp)
# positions invalidated
looptoken.compiled_loop_token.invalidate_positions = []
def make_function_returning_stack_pointer(self):
mc = InstrBuilder()
mc.LGR(r.r2, r.SP)
mc.BCR(c.ANY, r.r14)
return rffi.cast(lltype.Signed, mc.get_assembler_function())
def make_function_returning_stack_pointer(self):
mc = InstrBuilder()
mc.LGR(r.r2, r.SP)
mc.BCR(c.ANY, r.r14)
return rffi.cast(lltype.Signed, mc.get_assembler_function())