feat: indie status page MVP -- FastAPI + SQLite

- 8 DB models (services, incidents, monitors, subscribers, etc.)
- Full CRUD API for services, incidents, monitors
- Public status page with live data
- Incident detail page with timeline
- API key authentication
- Uptime monitoring scheduler
- 13 tests passing
- TECHNICAL_DESIGN.md with full spec

venv/lib/python3.11/site-packages/mypyc/transform/spill.py

@@ -0,0 +1,113 @@
+"""Insert spills for values that are live across yields."""
+
+from __future__ import annotations
+
+from mypyc.analysis.dataflow import AnalysisResult, analyze_live_regs, get_cfg
+from mypyc.common import TEMP_ATTR_NAME
+from mypyc.ir.class_ir import ClassIR
+from mypyc.ir.func_ir import FuncIR
+from mypyc.ir.ops import (
+    BasicBlock,
+    Branch,
+    DecRef,
+    GetAttr,
+    IncRef,
+    LoadErrorValue,
+    Register,
+    SetAttr,
+    Value,
+)
+
+
+def insert_spills(ir: FuncIR, env: ClassIR) -> None:
+    cfg = get_cfg(ir.blocks, use_yields=True)
+    live = analyze_live_regs(ir.blocks, cfg)
+    entry_live = live.before[ir.blocks[0], 0]
+
+    entry_live = {op for op in entry_live if not (isinstance(op, Register) and op.is_arg)}
+    # TODO: Actually for now, no Registers at all -- we keep the manual spills
+    entry_live = {op for op in entry_live if not isinstance(op, Register)}
+
+    ir.blocks = spill_regs(ir.blocks, env, entry_live, live, ir.arg_regs[0])
+
+
+def spill_regs(
+    blocks: list[BasicBlock],
+    env: ClassIR,
+    to_spill: set[Value],
+    live: AnalysisResult[Value],
+    self_reg: Register,
+) -> list[BasicBlock]:
+    env_reg: Value
+    for op in blocks[0].ops:
+        if isinstance(op, GetAttr) and op.attr == "__mypyc_env__":
+            env_reg = op
+            break
+    else:
+        # Environment has been merged into generator object
+        env_reg = self_reg
+
+    spill_locs = {}
+    for i, val in enumerate(to_spill):
+        name = f"{TEMP_ATTR_NAME}2_{i}"
+        env.attributes[name] = val.type
+        if val.type.error_overlap:
+            # We can safely treat as always initialized, since the type has no pointers.
+            # This way we also don't need to manage the defined attribute bitfield.
+            env._always_initialized_attrs.add(name)
+        spill_locs[val] = name
+
+    for block in blocks:
+        ops = block.ops
+        block.ops = []
+
+        for i, op in enumerate(ops):
+            to_decref = []
+
+            if isinstance(op, IncRef) and op.src in spill_locs:
+                raise AssertionError("not sure what to do with an incref of a spill...")
+            if isinstance(op, DecRef) and op.src in spill_locs:
+                # When we decref a spilled value, we turn that into
+                # NULLing out the attribute, but only if the spilled
+                # value is not live *when we include yields in the
+                # CFG*. (The original decrefs are computed without that.)
+                #
+                # We also skip a decref is the env register is not
+                # live. That should only happen when an exception is
+                # being raised, so everything should be handled there.
+                if op.src not in live.after[block, i] and env_reg in live.after[block, i]:
+                    # Skip the DecRef but null out the spilled location
+                    null = LoadErrorValue(op.src.type)
+                    block.ops.extend([null, SetAttr(env_reg, spill_locs[op.src], null, op.line)])
+                continue
+
+            if (
+                any(src in spill_locs for src in op.sources())
+                # N.B: IS_ERROR should be before a spill happens
+                # XXX: but could we have a regular branch?
+                and not (isinstance(op, Branch) and op.op == Branch.IS_ERROR)
+            ):
+                new_sources: list[Value] = []
+                stolen = op.stolen()
+                for src in op.sources():
+                    if src in spill_locs:
+                        read = GetAttr(env_reg, spill_locs[src], op.line)
+                        block.ops.append(read)
+                        new_sources.append(read)
+                        if src.type.is_refcounted and src not in stolen:
+                            to_decref.append(read)
+                    else:
+                        new_sources.append(src)
+
+                op.set_sources(new_sources)
+
+            block.ops.append(op)
+
+            for dec in to_decref:
+                block.ops.append(DecRef(dec))
+
+            if op in spill_locs:
+                # XXX: could we set uninit?
+                block.ops.append(SetAttr(env_reg, spill_locs[op], op, op.line))
+
+    return blocks