前端进度条性能优化、仿真结束后后处理优化；后端C代码生成流程优化：先识别来源，再按照已知未知量需求排序，最后局部求解

app/simulation/core/port_computation.py

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+"""Compile-time variable supply contracts, separate from physical flow direction.
+
+Equation ports may participate in a simultaneous solve. Fixed ports (for example
+an Amesim node's reference/branch ports) require complementary local supplies.
+These declarations do not add numerical state or Python evaluation callbacks.
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import TYPE_CHECKING, Literal, Mapping
+
+if TYPE_CHECKING:
+    from .ports import PortDefinition
+
+
+VARIABLE_LABELS = {
+    "p": "压力", "T": "温度", "m_flow": "质量流率", "H_flow": "能量流率",
+}
+
+
+@dataclass(frozen=True)
+class PortComputation:
+    inputs: tuple[str, ...] = ()
+    outputs: tuple[str, ...] = ()
+    mode: Literal["equation", "fixed"] = "equation"
+    # Output p/T aliases an input on another port of the same component.
+    reference_port: str | None = None
+
+    def __post_init__(self) -> None:
+        if self.mode not in {"equation", "fixed"}:
+            raise ValueError(f"Unknown port computation mode: {self.mode}")
+        members = (*self.inputs, *self.outputs)
+        if len(set(members)) != len(members) or set(members) - VARIABLE_LABELS.keys():
+            raise ValueError("Port computation variables must be unique, supported quantities.")
+        if self.reference_port and not {"p", "T"}.issubset(self.outputs):
+            raise ValueError("A reference alias must supply pressure and temperature.")
+
+    def as_dict(self) -> dict[str, object]:
+        return {
+            "mode": self.mode,
+            "inputs": list(self.inputs),
+            "outputs": list(self.outputs),
+            **({"referencePort": self.reference_port} if self.reference_port else {}),
+        }
+
+
+THERMODYNAMIC_SUPPLY = PortComputation(inputs=("m_flow", "H_flow"), outputs=("p", "T"))
+FLOW_SUPPLY = PortComputation(inputs=("p", "T"), outputs=("m_flow", "H_flow"))
+ZERO_FLOW_SUPPLY = PortComputation(outputs=("m_flow", "H_flow"))
+IMPLICIT_PNEUMATIC = PortComputation()
+NODE_REFERENCE = PortComputation(inputs=("p", "T"), outputs=("m_flow", "H_flow"), mode="fixed")
+NODE_BRANCH = PortComputation(inputs=("m_flow", "H_flow"), outputs=("p", "T"),
+                              mode="fixed", reference_port="port_2")
+
+
+@dataclass(frozen=True)
+class PortSupplyIssue:
+    code: str
+    message: str
+    endpoint: tuple[str, str] | None = None
+
+
+class PortSupplyError(ValueError):
+    def __init__(self, issue: PortSupplyIssue):
+        self.issue = issue
+        super().__init__(f"{issue.code}: {issue.message}")
+
+
+def port_supply_issue(first: PortDefinition, second: PortDefinition,
+                      first_label: str | None = None, second_label: str | None = None
+                      ) -> PortSupplyIssue | None:
+    """Check fixed causality; ordinary equation-to-equation links stay legal."""
+    if first.kind != second.kind or first.domain != second.domain:
+        return None  # Domain/type checks own their existing, more specific errors.
+    a, b = first.computation, second.computation
+    if not any(item and item.mode == "fixed" for item in (a, b)):
+        return None
+    for consumer, supplier, consumer_label, supplier_label in (
+        (a, b, first_label or first.name, second_label or second.name),
+        (b, a, second_label or second.name, first_label or first.name),
+    ):
+        if consumer is None:
+            continue
+        missing = [name for name in consumer.inputs
+                   if supplier is None or name not in supplier.outputs]
+        if missing:
+            quantities = "、".join(VARIABLE_LABELS[name] for name in missing)
+            return PortSupplyIssue(
+                "CONNECTION_VARIABLE_SUPPLY_MISSING",
+                f"{consumer_label} 需要对端提供{quantities}，但 {supplier_label} 未提供；"
+                "请检查参考口与支路口的连接。气体流向反转不会改变这一供需关系。",
+            )
+    return None
+
+
+def reference_supply_issues(
+    ports: Mapping[tuple[str, str], PortDefinition],
+    adjacency: Mapping[tuple[str, str], tuple[str, str]],
+) -> list[PortSupplyIssue]:
+    """Follow declared aliases to reject a reference ring without an origin.
+
+    This is a supply check, not a whole-system execution scheduler. Reference
+    chains are iterative to support deep networks without Python recursion.
+    """
+    issues = []
+    resolved: dict[str, set[tuple[str, str]]] = {'p': set(), 'T': set()}
+    for endpoint, port in ports.items():
+        contract = port.computation
+        if not contract or contract.mode != "fixed" or not {"p", "T"}.issubset(contract.inputs):
+            continue
+        if endpoint not in adjacency:
+            continue  # Existing unconnected-port checks handle incomplete drawings.
+        for variable in ("p", "T"):
+            current = endpoint
+            visited: set[tuple[str, str]] = set()
+            chain: list[str] = []
+            while True:
+                if current in resolved[variable]:
+                    resolved[variable].update(visited)
+                    break
+                if current in visited:
+                    issues.append(PortSupplyIssue(
+                        "REFERENCE_SUPPLY_CYCLE",
+                        f"{'.'.join(endpoint)} 的{VARIABLE_LABELS[variable]}参考形成循环，"
+                        f"没有实际提供者：{' → '.join(chain)} → {'.'.join(current)}。",
+                        endpoint,
+                    ))
+                    break
+                visited.add(current)
+                chain.append('.'.join(current))
+                supplier = adjacency.get(current)
+                if supplier is None:
+                    issues.append(PortSupplyIssue(
+                        "REFERENCE_SUPPLY_UNCONNECTED",
+                        f"{'.'.join(endpoint)} 的{VARIABLE_LABELS[variable]}参考链在 "
+                        f"{'.'.join(current)} 中断：该参考输入尚未连接。", endpoint,
+                    ))
+                    break
+                supplied = ports.get(supplier)
+                supply = supplied.computation if supplied else None
+                if supply is None or variable not in supply.outputs:
+                    # Direct errors are already reported per connection. An
+                    # indirect failure is explained at that failing connection.
+                    break
+                if supply.reference_port is None:
+                    resolved[variable].update(visited)
+                    break
+                chain.append('.'.join(supplier))
+                current = supplier[0], supply.reference_port
+                if current not in ports:
+                    raise ValueError(f"Invalid reference port declaration: {current}")
+    return issues