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Tighten specialization guards and add send_none fastpath #7359

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Merged
youknowone merged 17 commits into from
Mar 5, 2026
Merged

Tighten specialization guards and add send_none fastpath #7359

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e4abe4a
vm: align specialization guards with CPython patterns
youknowone Mar 5, 2026
1d69c5b
vm: tighten call specialization runtime guards
youknowone Mar 5, 2026
f0a235e
vm: add send_none fastpath for generator specialization
youknowone Mar 5, 2026
e518287
vm: restrict method-descriptor specialization to methods
youknowone Mar 5, 2026
01cdfb5
vm: deopt call specializations on guard misses
youknowone Mar 5, 2026
690921a
vm: match CPython send/for-iter closed-frame guards
youknowone Mar 5, 2026
ed4b7fa
vm: restrict len/isinstance specialization to builtins
youknowone Mar 5, 2026
78dbbb0
vm: use exact-type guards for call specializations
youknowone Mar 5, 2026
01a4c27
vm: align class-call specialization flow with CPython
youknowone Mar 5, 2026
397143b
vm: prefer FAST call opcodes for positional builtin calls
youknowone Mar 5, 2026
41e58d3
vm: add callable identity guard to CALL_LIST_APPEND
youknowone Mar 5, 2026
c694fe1
vm: make CALL_LIST_APPEND runtime guard pointer-based
youknowone Mar 5, 2026
ab82f5b
vm: align call guard cache and fallback behavior with CPython
youknowone Mar 5, 2026
f630d01
vm: use base vectorcall fallback for EXIT-style call misses
youknowone Mar 5, 2026
eeff412
vm: simplify CALL_LEN/CALL_ISINSTANCE runtime guards
youknowone Mar 5, 2026
2a23d3b
vm: infer call-convention flags for CPython-style CALL specialization
youknowone Mar 5, 2026
c7d095a
vm: check use_tracing in eval_frame_active, add SendGen send_none
youknowone Mar 5, 2026
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vm: align class-call specialization flow with CPython
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@youknowone
youknowone committed Mar 5, 2026
commit 01a4c27014ab5b94200388fbb53b96d9bcec4003
46 changes: 27 additions & 19 deletions crates/vm/src/frame.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7866,30 +7866,38 @@ impl ExecutingFrame<'_> {
}

// type/str/tuple(x) and class-call specializations
if callable.class().is(vm.ctx.types.type_type)
&& let Some(cls) = callable.downcast_ref::<PyType>()
{
if !self_or_null_is_some && nargs == 1 {
let new_op = if callable.is(&vm.ctx.types.type_type.as_object()) {
Some(Instruction::CallType1)
} else if callable.is(&vm.ctx.types.str_type.as_object()) {
Some(Instruction::CallStr1)
} else if callable.is(&vm.ctx.types.tuple_type.as_object()) {
Some(Instruction::CallTuple1)
} else {
None
};
if let Some(new_op) = new_op {
self.specialize_at(instr_idx, cache_base, new_op);
if let Some(cls) = callable.downcast_ref::<PyType>() {
if cls.slots.flags.has_feature(PyTypeFlags::IMMUTABLETYPE) {
if !self_or_null_is_some && nargs == 1 {
let new_op = if callable.is(&vm.ctx.types.type_type.as_object()) {
Some(Instruction::CallType1)
} else if callable.is(&vm.ctx.types.str_type.as_object()) {
Some(Instruction::CallStr1)
} else if callable.is(&vm.ctx.types.tuple_type.as_object()) {
Some(Instruction::CallTuple1)
} else {
None
};
if let Some(new_op) = new_op {
self.specialize_at(instr_idx, cache_base, new_op);
return;
}
}
if cls.slots.vectorcall.load().is_some() {
self.specialize_at(instr_idx, cache_base, Instruction::CallBuiltinClass);
return;
}
self.specialize_at(instr_idx, cache_base, Instruction::CallNonPyGeneral);
return;
}
if cls.slots.flags.has_feature(PyTypeFlags::IMMUTABLETYPE)
&& cls.slots.vectorcall.load().is_some()
{
self.specialize_at(instr_idx, cache_base, Instruction::CallBuiltinClass);

// CPython only considers CALL_ALLOC_AND_ENTER_INIT for types whose
// metaclass is exactly `type`.
if !callable.class().is(vm.ctx.types.type_type) {
self.specialize_at(instr_idx, cache_base, Instruction::CallNonPyGeneral);
return;
}

// CallAllocAndEnterInit: heap type with default __new__
if !self_or_null_is_some && cls.slots.flags.has_feature(PyTypeFlags::HEAPTYPE) {
let object_new = vm.ctx.types.object_type.slots.new.load();
Expand Down