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builder.py
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builder.py
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import attrs
import structlog
from puya.errors import CodeError, InternalError
from puya.ir import models as ir
from puya.ir.types_ import AVMBytesEncoding
from puya.ir.visitor import IRVisitor
from puya.mir import models
from puya.mir.context import ProgramCodeGenContext
from puya.utils import biguint_bytes_eval
logger: structlog.typing.FilteringBoundLogger = structlog.get_logger(__name__)
@attrs.define
class MemoryIRBuilder(IRVisitor[None]):
context: ProgramCodeGenContext = attrs.field(on_setattr=attrs.setters.frozen)
current_subroutine: ir.Subroutine
is_main: bool
current_ops: list[models.BaseOp] = attrs.field(factory=list)
active_op: ir.Op | ir.ControlOp | None = None
next_block: ir.BasicBlock | None = None
def _add_op(self, op: models.BaseOp) -> None:
self.current_ops.append(op)
def _get_block_name(self, block: ir.BasicBlock) -> str:
assert block in self.current_subroutine.body
comment = (block.comment or "block").replace(" ", "_")
subroutine_name = self.context.subroutine_names[self.current_subroutine]
return f"{subroutine_name}_{comment}@{block.id}"
def visit_assignment(self, ass: ir.Assignment) -> None:
ass.source.accept(self)
# right most target is top of stack
for target in reversed(ass.targets):
try:
param_idx = self.current_subroutine.parameters.index(target)
except ValueError:
self._add_op(
models.StoreVirtual(
local_id=target.local_id,
source_location=ass.source_location,
atype=target.atype,
)
)
else:
index = param_idx - len(self.current_subroutine.parameters)
self._add_op(
models.StoreParam(
local_id=target.local_id,
index=index,
source_location=ass.source_location,
atype=target.atype,
)
)
def visit_register(self, reg: ir.Register) -> None:
try:
param_idx = self.current_subroutine.parameters.index(reg)
except ValueError:
self._add_op(
models.LoadVirtual(
local_id=reg.local_id,
source_location=(self.active_op or reg).source_location,
atype=reg.atype,
)
)
else:
index = param_idx - len(self.current_subroutine.parameters)
self._add_op(
models.LoadParam(
local_id=reg.local_id,
index=index,
source_location=(self.active_op or reg).source_location,
atype=reg.atype,
)
)
def visit_template_var(self, deploy_var: ir.TemplateVar) -> None:
self._add_op(
models.PushTemplateVar(
name=deploy_var.name,
atype=deploy_var.atype,
source_location=deploy_var.source_location,
)
)
def visit_value_tuple(self, tup: ir.ValueTuple) -> None:
raise InternalError(
"Encountered ValueTuple during codegen - should have been eliminated in prior stages",
tup.source_location,
)
def visit_uint64_constant(self, const: ir.UInt64Constant) -> None:
self._add_op(
models.PushInt(
const.value if not const.teal_alias else const.teal_alias,
source_location=const.source_location,
)
)
def visit_biguint_constant(self, const: ir.BigUIntConstant) -> None:
big_uint_bytes = biguint_bytes_eval(const.value)
self._add_op(
models.PushBytes(
big_uint_bytes,
source_location=const.source_location,
comment=str(const.value),
encoding=AVMBytesEncoding.base16,
)
)
def visit_bytes_constant(self, const: ir.BytesConstant) -> None:
self._add_op(
models.PushBytes(
const.value, encoding=const.encoding, source_location=const.source_location
)
)
def visit_address_constant(self, const: ir.AddressConstant) -> None:
self._add_op(
models.PushAddress(
const.value,
source_location=const.source_location,
)
)
def visit_method_constant(self, const: ir.MethodConstant) -> None:
self._add_op(
models.PushMethod(
const.value,
source_location=const.source_location,
)
)
def visit_phi(self, phi: ir.Phi) -> None:
raise InternalError(
"Encountered Phi node during codegen - should have been eliminated in prior stages",
phi.source_location,
)
def visit_phi_argument(self, arg: ir.PhiArgument) -> None:
raise InternalError(
"Encountered PhiArgument during codegen - should have been eliminated in prior stages",
arg.source_location,
)
def visit_intrinsic_op(self, intrinsic: ir.Intrinsic) -> None:
if intrinsic.op.min_avm_version > self.context.options.target_avm_version:
raise CodeError(
f"Opcode {intrinsic.op.code} requires a min avm version of "
f"{intrinsic.op.min_avm_version} but the target avm version is"
f" {self.context.options.target_avm_version}",
intrinsic.source_location,
)
for arg in intrinsic.args:
arg.accept(self)
self._add_op(
models.IntrinsicOp(
op_code=intrinsic.op.code,
immediates=intrinsic.immediates,
source_location=intrinsic.source_location,
consumes=len(intrinsic.op_signature.args),
produces=len(intrinsic.op_signature.returns),
comment=intrinsic.comment,
)
)
def visit_invoke_subroutine(self, callsub: ir.InvokeSubroutine) -> None:
discard_results = callsub is self.active_op
target = callsub.target
callsub_op = models.CallSub(
target=self.context.subroutine_names[target],
parameters=len(target.parameters),
returns=len(target.returns),
source_location=callsub.source_location,
)
# prepare args
for arg in callsub.args:
arg.accept(self)
# call sub
self._add_op(callsub_op)
if discard_results and target.returns:
num_returns = len(target.returns)
self._add_op(models.Pop(num_returns))
def visit_conditional_branch(self, branch: ir.ConditionalBranch) -> None:
branch.condition.accept(self)
if self.next_block is branch.zero:
other = branch.zero
self._add_op(
models.BranchNonZero(
immediates=[self._get_block_name(branch.non_zero)],
source_location=branch.source_location,
)
)
else:
other = branch.non_zero
self._add_op(
models.BranchZero(
immediates=[self._get_block_name(branch.zero)],
source_location=branch.source_location,
)
)
self._add_op(
models.Branch(
immediates=[self._get_block_name(other)], source_location=branch.source_location
)
)
def visit_goto(self, goto: ir.Goto) -> None:
self._add_op(
models.Branch(
immediates=[self._get_block_name(goto.target)],
source_location=goto.source_location,
)
)
def visit_goto_nth(self, goto_nth: ir.GotoNth) -> None:
block_labels = [self._get_block_name(block) for block in goto_nth.blocks]
goto_nth.value.accept(self)
self._add_op(
models.Switch(immediates=block_labels, source_location=goto_nth.source_location)
)
goto_nth.default.accept(self)
def visit_switch(self, switch: ir.Switch) -> None:
blocks = list[str]()
for case, block in switch.cases.items():
case.accept(self)
block_name = self._get_block_name(block)
blocks.append(block_name)
switch.value.accept(self)
self._add_op(models.Match(immediates=blocks, source_location=switch.source_location))
switch.default.accept(self)
def visit_subroutine_return(self, retsub: ir.SubroutineReturn) -> None:
for r in retsub.result:
r.accept(self)
self._add_op(
models.IntrinsicOp(
op_code="return",
source_location=retsub.source_location,
consumes=len(retsub.result),
produces=0,
)
if self.is_main
else models.RetSub(source_location=retsub.source_location, returns=len(retsub.result))
)
def visit_program_exit(self, exit_: ir.ProgramExit) -> None:
exit_.result.accept(self)
self._add_op(
models.IntrinsicOp(
op_code="return",
source_location=exit_.source_location,
consumes=0,
produces=0,
)
)
def visit_fail(self, fail: ir.Fail) -> None:
self._add_op(
models.IntrinsicOp(
op_code="err",
comment=fail.comment,
source_location=fail.source_location,
consumes=0,
produces=0,
)
)
def lower_block_to_teal(
self, block: ir.BasicBlock, next_block: ir.BasicBlock | None
) -> models.MemoryBasicBlock:
self.next_block = next_block
self.current_ops = list[models.BaseOp]()
for op in block.all_ops:
assert not isinstance(op, ir.Phi)
self.active_op = op
op.accept(self)
if (
next_block is not None
and self.current_ops
and isinstance((last_op := self.current_ops[-1]), models.IntrinsicOp)
and last_op.op_code == "b"
and last_op.immediates[0] == (next_block_name := self._get_block_name(next_block))
):
self.current_ops[-1] = models.Comment(
f"Implicit fall through to {next_block_name}",
source_location=last_op.source_location,
)
block_name = self._get_block_name(block)
predecessors = [self._get_block_name(b) for b in block.predecessors]
successors = [self._get_block_name(b) for b in block.successors]
return models.MemoryBasicBlock(
block_name=block_name,
ops=self.current_ops,
predecessors=predecessors,
successors=successors,
source_location=block.source_location,
)