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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --expose-wasm --stress-compaction
load('test/mjsunit/wasm/wasm-module-builder.js');
let initialPages = 1;
let maximumPages = 6;
function generateBuilder() {
let builder = new WasmModuleBuilder();
builder.addMemory(initialPages, maximumPages, true);
builder.addFunction('store', kSig_i_ii)
.addBody([
kExprGetLocal, 0, kExprGetLocal, 1, kExprI32StoreMem, 0, 0,
kExprGetLocal, 1
])
.exportFunc();
return builder;
}
// This test verifies that the effects of growing memory inside a loop
// affect the result of current_memory when the loop is over.
(function TestMemoryGrowInsideLoop() {
print('TestMemoryGrowInsideLoop ...');
let deltaPages = 1;
let builder = generateBuilder();
builder.addFunction('main', kSig_i_i)
.addBody([
// clang-format off
kExprLoop, kWasmStmt, // while
kExprGetLocal, 0, // -
kExprIf, kWasmStmt, // if <param0> != 0
// Grow memory.
kExprI32Const, deltaPages, // -
kExprMemoryGrow, kMemoryZero, // grow memory
kExprDrop, // drop the result of grow
// Decrease loop variable.
kExprGetLocal, 0, // -
kExprI32Const, 1, // -
kExprI32Sub, // -
kExprSetLocal, 0, // decrease <param0>
kExprBr, 1, // continue
kExprEnd, // end if
kExprEnd, // end loop
// Return the memory size.
kExprMemorySize, kMemoryZero // put memory size on stack
// clang-format on
])
.exportFunc();
{
// Avoid the loop branch (not growing memory).
let instance = builder.instantiate();
let iterations = 0;
let expectedPages = initialPages + iterations * deltaPages;
assertTrue(expectedPages <= maximumPages);
assertEquals(expectedPages, instance.exports.main(iterations));
}
{
// Enter the loop branch (growing memory).
let instance = builder.instantiate();
let iterations = 2;
let expectedPages = initialPages + iterations * deltaPages;
assertTrue(expectedPages <= maximumPages);
assertEquals(expectedPages, instance.exports.main(iterations));
}
})();
// This test verifies that a loop does not affect the result of current_memory
// when the memory is grown both inside and outside the loop.
(function TestMemoryGrowInsideAndOutsideLoop() {
print('TestMemoryGrowInsideAndOutsideLoop ...');
let deltaPagesIn = 1;
let deltaPagesOut = 2;
let builder = generateBuilder();
builder.addFunction('main', kSig_i_i)
.addBody([
// clang-format off
// Grow memory.
kExprI32Const, deltaPagesOut, // -
kExprMemoryGrow, kMemoryZero, // grow memory
kExprDrop, // drop the result of grow
kExprLoop, kWasmStmt, // while
kExprGetLocal, 0, // -
kExprIf, kWasmStmt, // if <param0> != 0
// Grow memory.
kExprI32Const, deltaPagesIn, // -
kExprMemoryGrow, kMemoryZero, // grow memory
kExprDrop, // drop the result of grow
// Decrease loop variable.
kExprGetLocal, 0, // -
kExprI32Const, 1, // -
kExprI32Sub, // -
kExprSetLocal, 0, // decrease <param0>
kExprBr, 1, // continue
kExprEnd, // end if
kExprEnd, // end loop
// Return memory size.
kExprMemorySize, kMemoryZero // put memory size on stack
// clang-format on
])
.exportFunc();
{
// Avoid the loop branch (grow memory by deltaPagesOut).
let instance = builder.instantiate();
let iterations = 0;
let expectedPages = initialPages + deltaPagesOut;
assertTrue(expectedPages <= maximumPages);
assertEquals(expectedPages, instance.exports.main(iterations));
}
{
// Avoid the loop branch (grow memory by deltaPagesOut
// + iterations * deltaPagesIn).
let instance = builder.instantiate();
let iterations = 3;
let expectedPages =
initialPages + deltaPagesOut + (iterations * deltaPagesIn);
assertTrue(expectedPages <= maximumPages);
assertEquals(expectedPages, instance.exports.main(iterations));
}
})();
// This test verifies that the effects of writing to memory grown inside a loop
// are retained when the loop is over.
(function TestMemoryGrowAndStoreInsideLoop() {
print('TestMemoryGrowAndStoreInsideLoop ...');
let deltaPages = 1;
let builder = generateBuilder();
builder.addFunction('main', kSig_i_ii)
.addBody([
// clang-format off
kExprLoop, kWasmStmt, // while
kExprGetLocal, 0, // -
kExprIf, kWasmStmt, // if <param0> != 0
// Grow memory.
kExprI32Const, deltaPages, // -
kExprMemoryGrow, kMemoryZero, // grow memory
kExprDrop, // drop the result of grow
// Increase counter in memory.
kExprGetLocal, 1, // put index (for store)
kExprGetLocal, 1, // put index (for load)
kExprI32LoadMem, 0, 0, // load from grown memory
kExprI32Const, 1, // -
kExprI32Add, // increase counter
kExprI32StoreMem, 0, 0, // store counter in memory
// Decrease loop variable.
kExprGetLocal, 0, // -
kExprI32Const, 1, // -
kExprI32Sub, // -
kExprSetLocal, 0, // decrease <param0>
kExprBr, 1, // continue
kExprEnd, // end if
kExprEnd, // end loop
// Increase counter in memory.
kExprGetLocal, 1, // -
kExprI32LoadMem, 0, 0 // load from grown memory
// clang-format on
])
.exportFunc();
let index = 0;
let initialValue = 1;
{
// Avoid the loop (not growing memory).
let instance = builder.instantiate();
let iterations = 0;
let expectedValue = initialValue + iterations;
instance.exports.store(index, initialValue);
assertEquals(expectedValue, instance.exports.main(iterations, index));
}
{
// Enter the loop (growing memory + increasing counter in grown memory).
let instance = builder.instantiate();
let iterations = 2;
let expectedValue = initialValue + iterations;
instance.exports.store(index, initialValue);
assertEquals(expectedValue, instance.exports.main(iterations, index));
}
})();
// This test verifies that a loop does not affect the memory when the
// memory is grown both inside and outside the loop.
(function TestMemoryGrowAndStoreInsideAndOutsideLoop() {
print('TestMemoryGrowAndStoreInsideAndOutsideLoop ...');
let deltaPagesIn = 1;
let deltaPagesOut = 2;
let builder = generateBuilder();
builder.addFunction('main', kSig_i_ii)
.addBody([
// clang-format off
// Grow memory.
kExprI32Const, deltaPagesOut, // -
kExprMemoryGrow, kMemoryZero, // grow memory
kExprDrop, // drop the result of grow
// Increase counter in memory.
kExprGetLocal, 1, // put index (for store)
kExprGetLocal, 1, // put index (for load)
kExprI32LoadMem, 0, 0, // load from grown memory
kExprI32Const, 1, // -
kExprI32Add, // increase value on stack
kExprI32StoreMem, 0, 0, // store new value
// Start loop.
kExprLoop, kWasmStmt, // while
kExprGetLocal, 0, // -
kExprIf, kWasmStmt, // if <param0> != 0
// Grow memory.
kExprI32Const, deltaPagesIn, // -
kExprMemoryGrow, kMemoryZero, // grow memory
kExprDrop, // drop the result of grow
// Increase counter in memory.
kExprGetLocal, 1, // put index (for store)
kExprGetLocal, 1, // put index (for load)
kExprI32LoadMem, 0, 0, // load from grown memory
kExprI32Const, 1, // -
kExprI32Add, // increase value on stack
kExprI32StoreMem, 0, 0, // store new value
// Decrease loop variable.
kExprGetLocal, 0, // -
kExprI32Const, 1, // -
kExprI32Sub, // -
kExprSetLocal, 0, // decrease <param0>
kExprBr, 1, // continue
kExprEnd, // end if
kExprEnd, // end loop
// Return counter from memory.
kExprGetLocal, 1, // put index on stack
kExprI32LoadMem, 0, 0 // load from grown memory
// clang-format on
])
.exportFunc();
let index = 0;
let initialValue = 1;
{
// Avoid the loop (grow memory and increment counter only outside the loop).
let instance = builder.instantiate();
let iterations = 0;
let expectedValue = initialValue + 1;
instance.exports.store(index, initialValue);
assertEquals(expectedValue, instance.exports.main(iterations, index));
}
{
// Enter the loop (grow memory and increment counter outside/inside loop).
let instance = builder.instantiate();
let iterations = 3;
let expectedValue = initialValue + iterations + 1;
instance.exports.store(index, initialValue);
assertEquals(expectedValue, instance.exports.main(iterations, index));
}
})();
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