387 lines
12 KiB
Python
387 lines
12 KiB
Python
import ll
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import parser
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from enum import Enum
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def TODO(msg):
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print('TODO: not implemented yet at {}'
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.format(msg))
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def err(msg):
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print('ERROR: {}'
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.format(msg))
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def warn(msg):
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print('WARNING: {}'
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.format(msg))
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class Garbage(Enum):
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GARBAGE = '<<Unitialized memory>>'
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def step(insns, terminator, blocks, stack_frames, ssa_env, global_env, heap,
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tdecs, fdecs, call_res):
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if len(insns) == 0:
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return terminate(terminator, blocks, stack_frames, ssa_env, global_env, heap,
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call_res)
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ssa_target, next_insn = insns[0]
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insns_rest = insns[1:]
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# TODO
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print('Evaluating {}'
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.format(ll.insn2s(next_insn)))
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res = None
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if isinstance(next_insn, ll.Binop):
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bop = next_insn.bop
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left = next_insn.left
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right = next_insn.right
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left_v = eval_oper(left, ssa_env, global_env)
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right_v = eval_oper(right, ssa_env, global_env)
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res = eval_binop(bop, left_v, right_v)
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# TODO
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print('{} {}, {}'
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.format(bop, left_v, right_v))
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elif isinstance(next_insn, ll.Alloca):
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ty = next_insn.ty
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base_ty = ty2base_ty(ty, tdecs)
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size = base_ty2size(base_ty)
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# TODO
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print('alloca {} --> allocating {} cells'
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.format(ll.ty2s(base_ty), size))
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ptr = len(heap)
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for i in range(max(size, 1)):
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heap.append(Garbage.GARBAGE)
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res = ptr
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elif isinstance(next_insn, ll.Load):
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TODO('Load')
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elif isinstance(next_insn, ll.Store):
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ty = next_insn.ty
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value = next_insn.value
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location = next_insn.location
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value_v = eval_oper(value, ssa_env, global_env)
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location_v = eval_oper(location, ssa_env, global_env)
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# TODO
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print('heap[{}] <- {}'
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.format(location_v, value_v))
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heap[location_v] = value_v
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elif isinstance(next_insn, ll.Icmp):
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cnd = next_insn.cnd
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left = next_insn.left
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right = next_insn.right
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left_v = eval_oper(left, ssa_env, global_env)
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right_v = eval_oper(right, ssa_env, global_env)
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res = eval_icmp(cnd, left_v, right_v)
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# TODO
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print('icmp {} {}, {}'
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.format(cnd, left_v, right_v))
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elif isinstance(next_insn, ll.Call):
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callee = next_insn.callee
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arguments = next_insn.arguments
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if not isinstance(callee, ll.Gid):
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err('Cannot call anything but global identifiers: {}'
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.format(ll.oper2s(callee)))
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return insns_rest, terminator, blocks, stack_frames, ssa_env, heap, call_res
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arguments_v = [eval_oper(oper, ssa_env, global_env)
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for ty, oper in arguments]
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try:
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function = fdecs[callee.val]
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except KeyError:
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err('Could not find function {} in environment:\n{}'
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.format(callee.val, fdecs.keys()))
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return insns_rest, terminator, blocks, stack_frames, ssa_env, heap, call_res
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parameters = function.parameters
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print('call @{} ({})'
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.format(callee.val,
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', '.join('%{} <- {}'.format(par[1], arg)
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for par, arg in zip(parameters, arguments_v))))
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child_insns = function.body.first_block.insns
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child_terminator = function.body.first_block.terminator
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child_blocks = function.body.named_blocks
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child_stack_frames = [(insns_rest, terminator, blocks, ssa_env)] + stack_frames
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child_ssa_env = {par[1]: arg for par, arg in zip(parameters, arguments_v)}
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child_heap = heap
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child_call_res = [ssa_target] + call_res
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return (child_insns, child_terminator, child_blocks, child_stack_frames,
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child_ssa_env, child_heap, child_call_res)
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elif isinstance(next_insn, ll.Bitcast):
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oper = next_insn.oper
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from_ty = next_insn.from_ty
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to_ty = next_insn.to_ty
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oper_v = eval_oper(oper, ssa_env, global_env)
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res = oper_v
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# TODO
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print('bitcast {} {} to {}'
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.format(ll.ty2s(from_ty), oper_v, ll.ty2s(to_ty)))
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elif isinstance(next_insn, ll.Gep):
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TODO('Gep')
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elif isinstance(next_insn, ll.Zext):
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oper = next_insn.oper
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from_ty = next_insn.from_ty
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to_ty = next_insn.to_ty
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oper_v = eval_oper(oper, ssa_env, global_env)
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res = oper_v
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# TODO
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print('zext {} {} to {}'
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.format(ll.ty2s(from_ty), oper_v, ll.ty2s(to_ty)))
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elif isinstance(next_insn, ll.Ptrtoint):
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oper = next_insn.oper
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pointer_ty = next_insn.pointer_ty
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to_ty = next_insn.to_ty
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oper_v = eval_oper(oper, ssa_env, global_env)
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res = oper_v
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# TODO
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print('ptrtoint {}* {} to {}'
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.format(ll.ty2s(pointer_ty), oper_v, ll.ty2s(to_ty)))
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elif isinstance(next_insn, ll.CallResult):
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res = next_insn.val
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else:
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err('Unknown LLVM instruction: {}'
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.format(next_insn))
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if ssa_target is not None:
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if ssa_target in ssa_env:
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err('Cannot assign to variable twice: {}'
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.format(ssa_target))
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elif res is None:
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err('Cannot assign empty value to %{}'
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.format(ssa_target))
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else:
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# TODO
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print('%{} <- {}'
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.format(ssa_target, res))
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ssa_env[ssa_target] = res
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return insns_rest, terminator, blocks, stack_frames, ssa_env, heap, call_res
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def terminate(terminator, blocks, stack_frames, ssa_env, global_env, heap, call_res):
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def clear_block_from_ssa_env(insns, ssa_env):
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for (id, insn) in insns:
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if id is not None and id in ssa_env:
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del ssa_env[id]
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print('Evaluating {}'
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.format(ll.terminator2s(terminator)))
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if isinstance(terminator, ll.Ret):
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oper = terminator.oper
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if oper is None:
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oper_v = None
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else:
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oper_v = eval_oper(oper, ssa_env, global_env)
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# TODO
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print('Returning {}'
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.format(oper_v))
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if len(stack_frames) == 0:
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new_insns = [(None, ll.CallResult(oper_v))]
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new_terminator = None
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new_blocks = {}
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new_ssa_env = ssa_env
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new_stack_frames = []
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new_call_res = []
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else:
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new_insns, new_terminator, new_blocks, new_ssa_env = stack_frames[0]
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new_insns = [(call_res[0], ll.CallResult(oper_v))] + new_insns
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new_stack_frames = stack_frames[1:]
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new_call_res = call_res[1:]
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return (new_insns, new_terminator, new_blocks, new_stack_frames,
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new_ssa_env, heap, new_call_res)
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elif isinstance(terminator, ll.Br):
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label = terminator.label
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next_block = blocks[label]
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new_insns = next_block.insns
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new_terminator = next_block.terminator
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# TODO: Might need to find a better solution as we will ignore
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# multiple assignments, if they are spread over multiple
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# blocks.
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clear_block_from_ssa_env(new_insns, ssa_env)
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# TODO
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print('Jumping unconditionally to {}'
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.format(label))
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return (new_insns, new_terminator, blocks, stack_frames,
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ssa_env, heap, call_res)
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elif isinstance(terminator, ll.Cbr):
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ty = terminator.ty
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if ty != ll.SimpleType.I1:
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warn('Branching based on value of type {}. You ought to branch on {}'
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.format(ll.ty2s(ty), ll.ty2s(ll.SimpleType.I1)))
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operand = terminator.oper
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operand_v = eval_oper(operand, ssa_env, global_env)
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if operand_v:
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label = terminator.then_label
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else:
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label = terminator.else_label
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next_block = blocks[label]
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new_insns = next_block.insns
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new_terminator = next_block.terminator
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clear_block_from_ssa_env(new_insns, ssa_env)
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# TODO
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print('Operand was {}. Branching to {}'
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.format(operand_v, label))
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return (new_insns, new_terminator, blocks, stack_frames,
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ssa_env, heap, call_res)
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else:
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err('Unknown LLVM terminator: {}'
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.format(terminator))
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def eval_oper(operand, ssa_env, global_env):
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if isinstance(operand, ll.Null):
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return 0
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elif isinstance(operand, ll.Const):
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return operand.val
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elif isinstance(operand, ll.Gid):
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TODO('eval_oper Gid')
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elif isinstance(operand, ll.Id):
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id = operand.val
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try:
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return ssa_env[id]
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except KeyError:
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err('Unable to find %{} in environment:\n{}'
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.format(id, ssa_env))
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def eval_binop(bop, left, right):
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if bop == 'add':
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return left + right
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elif bop == 'sub':
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return left - right
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elif bop == 'mul':
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return left * right
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elif bop == 'sdiv':
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return left // right
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elif bop == 'shl':
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return left << right
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elif bop == 'ashr':
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return left >> right
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elif bop == 'lshr':
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return (left >> right) % 0x10000000000000000
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elif bop == 'and':
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return left & right
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elif bop == 'or':
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return left | right
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elif bop == 'xor':
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return left ^ right
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else:
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err('Unknown LLVM Binary operator: {}'
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.format(bop))
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def eval_icmp(cnd, left, right):
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if cnd == 'eq':
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return left == right
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elif cnd == 'ne':
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return left != right
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elif cnd == 'slt':
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return left < right
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elif cnd == 'sle':
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return left <= right
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elif cnd == 'sgt':
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return left > right
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elif cnd == 'sge':
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return left >= right
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else:
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err('eval_icmp: Unknown cnd: {}'
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.format(cnd))
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return 0
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def ty2base_ty(ty, tdecs):
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if isinstance(ty, ll.SimpleType):
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return ty
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elif isinstance(ty, ll.PointerType):
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return ll.PointerType(ty2base_ty(ty.inner_ty))
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else:
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# TODO
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err('ty2base_ty: Unknown type: {}'
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.format(ll.ty2s(ty)))
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return ty
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def base_ty2size(base_ty):
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if isinstance(base_ty, ll.SimpleType):
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return 1
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else:
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# TODO
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err('base_ty2size: Unknown type or illegal type: {}'
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.format(ll.ty2s(base_ty)))
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return 1
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def gogo():
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p = parser.LLVMParser()
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p.build()
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data = r'''
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define i64 @tigermain (i64 %U_mainSL_8, i64 %U_mainDummy_9) {
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%a = alloca i64
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store i64 9, i64* %a
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ret i64 77
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}
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'''
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print(data)
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ast = p.parse(data)
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tdecs = ast.tdecls
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fdecs = ast.fdecls
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global_env = ast.gdecls
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tigermain = ast.fdecls['tigermain']
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first_block = tigermain.body.first_block
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blocks = tigermain.body.named_blocks
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insns = first_block.insns
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terminator = first_block.terminator
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stack_frames = []
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ssa_env = {}
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# TODO: memory structure has not been decided yet
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heap = [None]
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call_res = []
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while True:
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(insns, terminator, blocks,
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stack_frames, ssa_env, heap, call_res) = step(insns, terminator, blocks,
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stack_frames, ssa_env,
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global_env, heap, tdecs,
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fdecs, call_res)
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if terminator is None:
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print('Stepping done! Final ssa_env:\n{}'
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.format(ssa_env))
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print('Program resulted in {}'.
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format(insns[0][1].val))
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break
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if __name__ == '__main__':
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gogo()
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