forked from LeenkxTeam/Kmake
69 lines
2.7 KiB
JavaScript
69 lines
2.7 KiB
JavaScript
// Copyright 2024 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --no-wasm-loop-unrolling --no-wasm-loop-peeling
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d8.file.execute('test/mjsunit/wasm/wasm-module-builder.js');
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const builder = new WasmModuleBuilder();
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let structA = builder.addStruct([makeField(kWasmI32, true)]);
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let structB = builder.addStruct([makeField(kWasmI64, true)]);
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builder.addFunction('main', makeSig([kWasmI32], [kWasmI32]))
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.addLocals(kWasmAnyRef, 1)
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.addLocals(kWasmI32, 1)
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.addBody([
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// Initialize local[1] with structA.
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kGCPrefix, kExprStructNewDefault, structA,
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kExprLocalSet, 1,
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kExprLoop, 0x7f,
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// Just a useless branch to move the ref.test out of the loop header.
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kExprI32Const, 1,
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kExprIf, kWasmVoid,
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kExprEnd,
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// ref.test if local[1] is of type structA.
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// This is guaranteed to succeed on the first iteration.
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// The else branch is marked as unreachable.
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kExprLocalGet, 1,
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kGCPrefix, kExprRefTest, structA,
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kExprIf, kWasmVoid,
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// This branch is taken on the first iteration.
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kExprElse,
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// This branch is taken on subsequent iterations.
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kExprEnd,
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// Push local[1] onto the value stack.
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kExprLocalGet, 1,
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// Update local[1] to a different type.
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// This will cause the analyzer having to revisit the loop a second time
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// as the LoopPhi for local[1] has now a different type.
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...wasmI64Const(0x1234567812345678n),
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kGCPrefix, kExprStructNew, structB,
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kExprLocalSet, 1,
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// Cast the old local[1] value on the stack to structA.
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// This is guaranteed to succeed on the first iteration.
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// It is guaranteed to fail on subsequent iterations, however the
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// WasmGCTypeReducer ignores this as the else branch of the if following
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// the ref.test is still marked as unreachable when revisiting the loop
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// a second time.
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kGCPrefix, kExprRefCast, structA,
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// <-- The value here is structB in the second iteration on which we have
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// a type confusion as the static type is structA.
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// Read the i32 field from the structA.
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// On the second iteration this is going to read one half of the i64 of
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// structB.
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kGCPrefix, kExprStructGet, structA, 0,
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kExprLocalTee, 2,
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kExprLocalGet, 2,
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// Compare the field with 0. If it is zero, repeat the loop, if it isn't
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// zero return the value.
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kExprI32Eqz,
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kExprBrIf, 0,
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kExprReturn,
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kExprEnd,
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]).exportFunc();
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const instance = builder.instantiate();
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assertTraps(kTrapIllegalCast, () => instance.exports.main(1));
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