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."""
from rpython.jit.backend.arm.codebuilder import InstrBuilder
for jmp, tgt in looptoken.compiled_loop_token.invalidate_positions:
mc = InstrBuilder(self.cpuinfo.arch_version)
mc.B_offs(tgt)
mc.copy_to_raw_memory(jmp)
# positions invalidated
looptoken.compiled_loop_token.invalidate_positions = []
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."""
from rpython.jit.backend.arm.codebuilder import InstrBuilder
for jmp, tgt in looptoken.compiled_loop_token.invalidate_positions:
mc = InstrBuilder(self.cpuinfo.arch_version)
mc.B_offs(tgt)
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
# we overwrite the instructions at the old _ll_function_addr
# to start with a JMP to the new _ll_function_addr.
# Ideally we should rather patch all existing CALLs, but well.
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)
mc = InstrBuilder(self.cpu.cpuinfo.arch_version)
mc.B(target)
mc.copy_to_raw_memory(oldadr)
def make_function_returning_stack_pointer(self):
mc = InstrBuilder()
mc.MOV_rr(r.r0.value, r.sp.value)
mc.MOV_rr(r.pc.value, r.lr.value)
return mc.materialize(self.cpu.asmmemmgr, [])
def make_function_returning_stack_pointer(self):
mc = InstrBuilder()
mc.MOV_rr(r.r0.value, r.sp.value)
mc.MOV_rr(r.pc.value, r.lr.value)
return mc.materialize(self.cpu, [])
