src/v8/test/mjsunit/wasm/grow-memory-in-call.js - cobalt - Git at Google

 // 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');

 var initialMemoryPages = 1;
 var maximumMemoryPages = 5;

 // Grow memory in directly called functions.
 print('=== grow_memory in direct calls ===');

 // This test verifies that the current_memory instruction returns the correct
 // value after returning from a function (direct call) that grew memory.
 (function TestMemoryGrowInFunction() {
   print('TestMemoryGrowInFunction ...');
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('main', kSig_i_i)
       .addBody([
         kExprGetLocal, 0,                  // get number of new pages
         kExprCallFunction, kGrowFunction,  // call the grow function
         kExprDrop,                         // drop the result of grow
         kExprMemorySize, kMemoryZero       // get the memory size
       ])
       .exportFunc();
   var instance = builder.instantiate();
   // The caller should be aware that the memory was grown by the callee.
   var deltaPages = 1;
   assertEquals(
       initialMemoryPages + deltaPages, instance.exports.main(deltaPages));
 })();

 // This test verifies that accessing a memory page that has been created inside
 // a function (direct call) does not trap in the caller.
 (function TestMemoryGrowAndAccessInFunction() {
   print('TestMemoryGrowAndAccessInFunction ...');
   let index = 2 * kPageSize - 4;
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('load', kSig_i_i)
       .addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
       .exportFunc();
   builder.addFunction('main', kSig_v_iii)
       .addBody([
         kExprGetLocal, 0,                  // get number of new pages
         kExprCallFunction, kGrowFunction,  // call the grow function
         kExprDrop,                         // drop the result of grow
         kExprGetLocal, 1,                  // get index
         kExprGetLocal, 2,                  // get value
         kExprI32StoreMem, 0, 0             // store
       ])
       .exportFunc();
   var instance = builder.instantiate();
   assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(index));
   var deltaPages = 1;
   instance.exports.main(deltaPages, index, 1234);
   // The caller should be able to access memory that was grown by the callee.
   assertEquals(1234, instance.exports.load(index));
 })();

 // This test verifies that when a function (direct call) grows and store
 // something in the grown memory, the caller always reads from the grown
 // memory. This checks that the memory start address gets updated in the caller.
 (function TestMemoryGrowAndStoreInFunction() {
   print('TestMemoryGrowAndStoreInFunction ...');
   let index = 0;
   let oldValue = 21;
   let newValue = 42;
   let deltaPages = 1;
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_v_v)
           .addBody([
             kExprI32Const, deltaPages,     // always grow memory by deltaPages
             kExprMemoryGrow, kMemoryZero,  // grow memory
             kExprDrop,                     // drop the result of grow
             kExprI32Const, index,          // put index on stack
             kExprI32Const, newValue,       // put new value on stack
             kExprI32StoreMem, 0, 0         // store
           ])
           .exportFunc()
           .index;
   builder.addFunction('main', kSig_i_i)
       .addBody([
         kExprI32Const, index,              // put index on stack
         kExprI32Const, oldValue,           // put old value on stack
         kExprI32StoreMem, 0, 0,            // store
         kExprCallFunction, kGrowFunction,  // call grow_and_store
         kExprI32Const, index,              // put index on stack
         kExprI32LoadMem, 0, 0              // load from grown memory
       ])
       .exportFunc();
   var instance = builder.instantiate();
   // The caller should always read from grown memory.
   assertEquals(newValue, instance.exports.main());
 })();

 // This test verifies that the effects of growing memory in an directly
 // called function inside a loop affect the result of current_memory when
 // the loop is over.
 (function TestMemoryGrowInFunctionInsideLoop() {
   print('TestMemoryGrowInFunctionInsideLoop ...');
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('main', kSig_i_ii)
       .addBody([
         // clang-format off
         kExprLoop, kWasmStmt,                   // while
           kExprGetLocal, 0,                     // -
           kExprIf, kWasmStmt,                   // if <param0> != 0
             // Grow memory.
             kExprGetLocal, 1,                   // get number of new pages
             kExprCallFunction, kGrowFunction,   // call the grow function
             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();
   // The caller should be aware that the memory was grown by the callee.
   let instance = builder.instantiate();
   let iterations = 4;
   let deltaPages = 1;
   assertEquals(
       initialMemoryPages + iterations * deltaPages,
       instance.exports.main(iterations, deltaPages));
 })();

 // This test verifies that the effects of writing to memory grown in an
 // directly called function inside a loop are retained when the loop is over.
 (function TestMemoryGrowAndStoreInFunctionInsideLoop() {
   print('TestMemoryGrowAndStoreInFunctionInsideLoop ...');
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   builder.addFunction('store', kSig_i_ii)
       .addBody([
         kExprGetLocal, 0, kExprGetLocal, 1, kExprI32StoreMem, 0, 0,
         kExprGetLocal, 1
       ])
       .exportFunc();
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   // parameters:  iterations, deltaPages, index
   builder.addFunction('main', kSig_i_iii)
       .addBody([
         // clang-format off
         kExprLoop, kWasmStmt,                   // while
           kExprGetLocal, 0,                     // -
           kExprIf, kWasmStmt,                   // if <param0> != 0
             // Grow memory.
             kExprGetLocal, 1,                   // get number of new pages
             kExprCallFunction, kGrowFunction,   // call the grow function
             kExprDrop,                          // drop the result of grow
             // Increase counter in memory.
             kExprGetLocal, 2,                   // put index (for store)
                 kExprGetLocal, 2,               // 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
         // Return the value
         kExprGetLocal, 2,                       // -
         kExprI32LoadMem, 0, 0                   // load from grown memory
         // clang-format on
       ])
       .exportFunc();
   // The caller should always read the correct memory
   let instance = builder.instantiate();
   let iterations = 4;
   let deltaPages = 1;
   let index = 0;
   let initialValue = 1;
   let expectedValue = initialValue + iterations;
   instance.exports.store(index, initialValue);
   assertEquals(
       expectedValue, instance.exports.main(iterations, deltaPages, index));
 })();

 // Grow memory in indirectly called functions.
 print('\n=== grow_memory in indirect calls ===');

 // This test verifies that the current_memory instruction returns the correct
 // value after returning from a function (indirect call) that grew memory.
 (function TestMemoryGrowInIndirectCall() {
   print('TestMemoryGrowInIndirectCall ...');
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('main', kSig_i_ii)
       .addBody([
         kExprGetLocal, 1,                  // get number of new pages
         kExprGetLocal, 0,                  // get index of the function
         kExprCallIndirect, 0, kTableZero,  // call the function
         kExprDrop,                         // drop the result of grow
         kExprMemorySize, kMemoryZero       // get the memory size
       ])
       .exportFunc();
   builder.appendToTable([kGrowFunction]);
   var instance = builder.instantiate();
   // The caller should be aware that the memory was grown by the callee.
   var deltaPages = 1;
   assertEquals(
       initialMemoryPages + deltaPages,
       instance.exports.main(kGrowFunction, deltaPages));
 })();

 // This test verifies that accessing a memory page that has been created inside
 // a function (indirect call) does not trap in the caller.
 (function TestMemoryGrowAndAccessInIndirectCall() {
   print('TestMemoryGrowAndAccessInIndirectCall ...');
   let index = 2 * kPageSize - 4;
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('load', kSig_i_i)
       .addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
       .exportFunc();
   let sig = makeSig([kWasmI32, kWasmI32, kWasmI32, kWasmI32], []);
   builder.addFunction('main', sig)
       .addBody([
         kExprGetLocal, 1,                  // get number of new pages
         kExprGetLocal, 0,                  // get index of the function
         kExprCallIndirect, 0, kTableZero,  // call the function
         kExprDrop,                         // drop the result of grow
         kExprGetLocal, 2,                  // get index
         kExprGetLocal, 3,                  // get value
         kExprI32StoreMem, 0, 0             // store
       ])
       .exportFunc();
   builder.appendToTable([kGrowFunction]);
   var instance = builder.instantiate();
   assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(index));
   let deltaPages = 1;
   let value = 1234;
   instance.exports.main(kGrowFunction, deltaPages, index, value);
   // The caller should be able to access memory that was grown by the callee.
   assertEquals(value, instance.exports.load(index));
 })();

 // This test verifies that when a function (indirect call) grows and store
 // something in the grown memory, the caller always reads from the grown
 // memory. This checks that the memory start address gets updated in the caller.
 (function TestMemoryGrowAndStoreInIndirectCall() {
   print('TestMemoryGrowAndStoreInIndirectCall ...');
   let index = 0;
   let oldValue = 21;
   let newValue = 42;
   let deltaPages = 1;
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_v_v)
           .addBody([
             kExprI32Const, deltaPages,     // always grow memory by deltaPages
             kExprMemoryGrow, kMemoryZero,  // grow memory
             kExprDrop,                     // drop the result of grow
             kExprI32Const, index,          // put index on stack
             kExprI32Const, newValue,       // put new value on stack
             kExprI32StoreMem, 0, 0         // store
           ])
           .exportFunc()
           .index;
   builder.addFunction('main', kSig_i_i)
       .addBody([
         kExprI32Const, index,              // put index on stack
         kExprI32Const, oldValue,           // put old value on stack
         kExprI32StoreMem, 0, 0,            // store
         kExprGetLocal, 0,                  // get index of the function
         kExprCallIndirect, 0, kTableZero,  // call the function
         kExprI32Const, index,              // put index on stack
         kExprI32LoadMem, 0, 0              // load from grown memory
       ])
       .exportFunc();
   builder.appendToTable([kGrowFunction]);
   var instance = builder.instantiate();
   // The caller should always read from grown memory.
   assertEquals(42, instance.exports.main(kGrowFunction));
 })();

 // This test verifies that the effects of growing memory in an indirectly
 // called function inside a loop affect the result of current_memory when
 // the loop is over.
 (function TestMemoryGrowInIndirectCallInsideLoop() {
   print('TestMemoryGrowInIndirectCallInsideLoop ...');
   let builder = new WasmModuleBuilder();
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('main', kSig_i_iii)
       .addBody([
         // clang-format off
         kExprLoop, kWasmStmt,                   // while
           kExprGetLocal, 1,                     // -
           kExprIf, kWasmStmt,                   // if <param1> != 0
             // Grow memory.
             kExprGetLocal, 2,                   // get number of new pages
             kExprGetLocal, 0,                   // get index of the function
             kExprCallIndirect, 0, kTableZero,   // call the function
             kExprDrop,                          // drop the result of grow
             // Decrease loop variable.
             kExprGetLocal, 1,                   // -
             kExprI32Const, 1,                   // -
             kExprI32Sub,                        // -
             kExprSetLocal, 1,                   // decrease <param1>
             kExprBr, 1,                         // continue
           kExprEnd,                             // end if
         kExprEnd,                               // end loop
         // Return the memory size.
         kExprMemorySize, kMemoryZero            // put memory size on stack
         // clang-format on
       ])
       .exportFunc();
   builder.appendToTable([kGrowFunction]);
   // The caller should be aware that the memory was grown by the callee.
   let instance = builder.instantiate();
   let deltaPages = 1;
   let iterations = 4;
   assertEquals(
       initialMemoryPages + iterations * deltaPages,
       instance.exports.main(kGrowFunction, iterations, deltaPages));
 })();

 // This test verifies that the effects of writing to memory grown in an
 // indirectly called function inside a loop are retained when the loop is over.
 (function TestMemoryGrowAndStoreInIndirectCallInsideLoop() {
   print('TestMemoryGrowAndStoreInIndirectCallInsideLoop ...');
   let builder = new WasmModuleBuilder();
   let deltaPages = 1;
   builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
   let kGrowFunction =
       builder.addFunction('grow', kSig_i_i)
           .addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
           .exportFunc()
           .index;
   builder.addFunction('store', kSig_i_ii)
       .addBody([
         kExprGetLocal, 0, kExprGetLocal, 1, kExprI32StoreMem, 0, 0,
         kExprGetLocal, 1
       ])
       .exportFunc();
   builder
       .addFunction(
           // parameters:  function_index, iterations, deltaPages, index
           'main', makeSig([kWasmI32, kWasmI32, kWasmI32, kWasmI32], [kWasmI32]))
       .addBody([
         // clang-format off
         kExprLoop, kWasmStmt,                   // while
           kExprGetLocal, 1,                     // -
           kExprIf, kWasmStmt,                   // if <param1> != 0
             // Grow memory.
             kExprGetLocal, 2,                   // get number of new pages
             kExprGetLocal, 0,                   // get index of the function
             kExprCallIndirect, 0, kTableZero,   // call the function
             kExprDrop,                          // drop the result of grow
             // Increase counter in memory.
             kExprGetLocal, 3,                   // put index (for store)
                 kExprGetLocal, 3,               // 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, 1,                   // -
             kExprI32Const, 1,                   // -
             kExprI32Sub,                        // -
             kExprSetLocal, 1,                   // decrease <param1>
             kExprBr, 1,                         // continue
           kExprEnd,                             // end if
         kExprEnd,                               // end loop
         // Return the value
         kExprGetLocal, 3,                       // -
         kExprI32LoadMem, 0, 0                   // load from grown memory
         // clang-format on
       ])
       .exportFunc();
   builder.appendToTable([kGrowFunction]);
   // The caller should be aware that the memory was grown by the callee.
   let instance = builder.instantiate();
   let iterations = 4;
   let index = 0;
   let initialValue = 1;
   let expectedValue = initialValue + iterations;
   instance.exports.store(index, initialValue);
   assertEquals(
       expectedValue,
       instance.exports.main(kGrowFunction, iterations, deltaPages, index));
 })();
	// 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');

	var initialMemoryPages = 1;
	var maximumMemoryPages = 5;

	// Grow memory in directly called functions.
	print('=== grow_memory in direct calls ===');

	// This test verifies that the current_memory instruction returns the correct
	// value after returning from a function (direct call) that grew memory.
	(function TestMemoryGrowInFunction() {
	print('TestMemoryGrowInFunction ...');
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('main', kSig_i_i)
	.addBody([
	kExprGetLocal, 0, // get number of new pages
	kExprCallFunction, kGrowFunction, // call the grow function
	kExprDrop, // drop the result of grow
	kExprMemorySize, kMemoryZero // get the memory size
	])
	.exportFunc();
	var instance = builder.instantiate();
	// The caller should be aware that the memory was grown by the callee.
	var deltaPages = 1;
	assertEquals(
	initialMemoryPages + deltaPages, instance.exports.main(deltaPages));
	})();

	// This test verifies that accessing a memory page that has been created inside
	// a function (direct call) does not trap in the caller.
	(function TestMemoryGrowAndAccessInFunction() {
	print('TestMemoryGrowAndAccessInFunction ...');
	let index = 2 * kPageSize - 4;
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('load', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
	.exportFunc();
	builder.addFunction('main', kSig_v_iii)
	.addBody([
	kExprGetLocal, 0, // get number of new pages
	kExprCallFunction, kGrowFunction, // call the grow function
	kExprDrop, // drop the result of grow
	kExprGetLocal, 1, // get index
	kExprGetLocal, 2, // get value
	kExprI32StoreMem, 0, 0 // store
	])
	.exportFunc();
	var instance = builder.instantiate();
	assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(index));
	var deltaPages = 1;
	instance.exports.main(deltaPages, index, 1234);
	// The caller should be able to access memory that was grown by the callee.
	assertEquals(1234, instance.exports.load(index));
	})();

	// This test verifies that when a function (direct call) grows and store
	// something in the grown memory, the caller always reads from the grown
	// memory. This checks that the memory start address gets updated in the caller.
	(function TestMemoryGrowAndStoreInFunction() {
	print('TestMemoryGrowAndStoreInFunction ...');
	let index = 0;
	let oldValue = 21;
	let newValue = 42;
	let deltaPages = 1;
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_v_v)
	.addBody([
	kExprI32Const, deltaPages, // always grow memory by deltaPages
	kExprMemoryGrow, kMemoryZero, // grow memory
	kExprDrop, // drop the result of grow
	kExprI32Const, index, // put index on stack
	kExprI32Const, newValue, // put new value on stack
	kExprI32StoreMem, 0, 0 // store
	])
	.exportFunc()
	.index;
	builder.addFunction('main', kSig_i_i)
	.addBody([
	kExprI32Const, index, // put index on stack
	kExprI32Const, oldValue, // put old value on stack
	kExprI32StoreMem, 0, 0, // store
	kExprCallFunction, kGrowFunction, // call grow_and_store
	kExprI32Const, index, // put index on stack
	kExprI32LoadMem, 0, 0 // load from grown memory
	])
	.exportFunc();
	var instance = builder.instantiate();
	// The caller should always read from grown memory.
	assertEquals(newValue, instance.exports.main());
	})();

	// This test verifies that the effects of growing memory in an directly
	// called function inside a loop affect the result of current_memory when
	// the loop is over.
	(function TestMemoryGrowInFunctionInsideLoop() {
	print('TestMemoryGrowInFunctionInsideLoop ...');
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('main', kSig_i_ii)
	.addBody([
	// clang-format off
	kExprLoop, kWasmStmt, // while
	kExprGetLocal, 0, // -
	kExprIf, kWasmStmt, // if <param0> != 0
	// Grow memory.
	kExprGetLocal, 1, // get number of new pages
	kExprCallFunction, kGrowFunction, // call the grow function
	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();
	// The caller should be aware that the memory was grown by the callee.
	let instance = builder.instantiate();
	let iterations = 4;
	let deltaPages = 1;
	assertEquals(
	initialMemoryPages + iterations * deltaPages,
	instance.exports.main(iterations, deltaPages));
	})();

	// This test verifies that the effects of writing to memory grown in an
	// directly called function inside a loop are retained when the loop is over.
	(function TestMemoryGrowAndStoreInFunctionInsideLoop() {
	print('TestMemoryGrowAndStoreInFunctionInsideLoop ...');
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	builder.addFunction('store', kSig_i_ii)
	.addBody([
	kExprGetLocal, 0, kExprGetLocal, 1, kExprI32StoreMem, 0, 0,
	kExprGetLocal, 1
	])
	.exportFunc();
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	// parameters: iterations, deltaPages, index
	builder.addFunction('main', kSig_i_iii)
	.addBody([
	// clang-format off
	kExprLoop, kWasmStmt, // while
	kExprGetLocal, 0, // -
	kExprIf, kWasmStmt, // if <param0> != 0
	// Grow memory.
	kExprGetLocal, 1, // get number of new pages
	kExprCallFunction, kGrowFunction, // call the grow function
	kExprDrop, // drop the result of grow
	// Increase counter in memory.
	kExprGetLocal, 2, // put index (for store)
	kExprGetLocal, 2, // 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
	// Return the value
	kExprGetLocal, 2, // -
	kExprI32LoadMem, 0, 0 // load from grown memory
	// clang-format on
	])
	.exportFunc();
	// The caller should always read the correct memory
	let instance = builder.instantiate();
	let iterations = 4;
	let deltaPages = 1;
	let index = 0;
	let initialValue = 1;
	let expectedValue = initialValue + iterations;
	instance.exports.store(index, initialValue);
	assertEquals(
	expectedValue, instance.exports.main(iterations, deltaPages, index));
	})();

	// Grow memory in indirectly called functions.
	print('\n=== grow_memory in indirect calls ===');

	// This test verifies that the current_memory instruction returns the correct
	// value after returning from a function (indirect call) that grew memory.
	(function TestMemoryGrowInIndirectCall() {
	print('TestMemoryGrowInIndirectCall ...');
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('main', kSig_i_ii)
	.addBody([
	kExprGetLocal, 1, // get number of new pages
	kExprGetLocal, 0, // get index of the function
	kExprCallIndirect, 0, kTableZero, // call the function
	kExprDrop, // drop the result of grow
	kExprMemorySize, kMemoryZero // get the memory size
	])
	.exportFunc();
	builder.appendToTable([kGrowFunction]);
	var instance = builder.instantiate();
	// The caller should be aware that the memory was grown by the callee.
	var deltaPages = 1;
	assertEquals(
	initialMemoryPages + deltaPages,
	instance.exports.main(kGrowFunction, deltaPages));
	})();

	// This test verifies that accessing a memory page that has been created inside
	// a function (indirect call) does not trap in the caller.
	(function TestMemoryGrowAndAccessInIndirectCall() {
	print('TestMemoryGrowAndAccessInIndirectCall ...');
	let index = 2 * kPageSize - 4;
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('load', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
	.exportFunc();
	let sig = makeSig([kWasmI32, kWasmI32, kWasmI32, kWasmI32], []);
	builder.addFunction('main', sig)
	.addBody([
	kExprGetLocal, 1, // get number of new pages
	kExprGetLocal, 0, // get index of the function
	kExprCallIndirect, 0, kTableZero, // call the function
	kExprDrop, // drop the result of grow
	kExprGetLocal, 2, // get index
	kExprGetLocal, 3, // get value
	kExprI32StoreMem, 0, 0 // store
	])
	.exportFunc();
	builder.appendToTable([kGrowFunction]);
	var instance = builder.instantiate();
	assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(index));
	let deltaPages = 1;
	let value = 1234;
	instance.exports.main(kGrowFunction, deltaPages, index, value);
	// The caller should be able to access memory that was grown by the callee.
	assertEquals(value, instance.exports.load(index));
	})();

	// This test verifies that when a function (indirect call) grows and store
	// something in the grown memory, the caller always reads from the grown
	// memory. This checks that the memory start address gets updated in the caller.
	(function TestMemoryGrowAndStoreInIndirectCall() {
	print('TestMemoryGrowAndStoreInIndirectCall ...');
	let index = 0;
	let oldValue = 21;
	let newValue = 42;
	let deltaPages = 1;
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_v_v)
	.addBody([
	kExprI32Const, deltaPages, // always grow memory by deltaPages
	kExprMemoryGrow, kMemoryZero, // grow memory
	kExprDrop, // drop the result of grow
	kExprI32Const, index, // put index on stack
	kExprI32Const, newValue, // put new value on stack
	kExprI32StoreMem, 0, 0 // store
	])
	.exportFunc()
	.index;
	builder.addFunction('main', kSig_i_i)
	.addBody([
	kExprI32Const, index, // put index on stack
	kExprI32Const, oldValue, // put old value on stack
	kExprI32StoreMem, 0, 0, // store
	kExprGetLocal, 0, // get index of the function
	kExprCallIndirect, 0, kTableZero, // call the function
	kExprI32Const, index, // put index on stack
	kExprI32LoadMem, 0, 0 // load from grown memory
	])
	.exportFunc();
	builder.appendToTable([kGrowFunction]);
	var instance = builder.instantiate();
	// The caller should always read from grown memory.
	assertEquals(42, instance.exports.main(kGrowFunction));
	})();

	// This test verifies that the effects of growing memory in an indirectly
	// called function inside a loop affect the result of current_memory when
	// the loop is over.
	(function TestMemoryGrowInIndirectCallInsideLoop() {
	print('TestMemoryGrowInIndirectCallInsideLoop ...');
	let builder = new WasmModuleBuilder();
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('main', kSig_i_iii)
	.addBody([
	// clang-format off
	kExprLoop, kWasmStmt, // while
	kExprGetLocal, 1, // -
	kExprIf, kWasmStmt, // if <param1> != 0
	// Grow memory.
	kExprGetLocal, 2, // get number of new pages
	kExprGetLocal, 0, // get index of the function
	kExprCallIndirect, 0, kTableZero, // call the function
	kExprDrop, // drop the result of grow
	// Decrease loop variable.
	kExprGetLocal, 1, // -
	kExprI32Const, 1, // -
	kExprI32Sub, // -
	kExprSetLocal, 1, // decrease <param1>
	kExprBr, 1, // continue
	kExprEnd, // end if
	kExprEnd, // end loop
	// Return the memory size.
	kExprMemorySize, kMemoryZero // put memory size on stack
	// clang-format on
	])
	.exportFunc();
	builder.appendToTable([kGrowFunction]);
	// The caller should be aware that the memory was grown by the callee.
	let instance = builder.instantiate();
	let deltaPages = 1;
	let iterations = 4;
	assertEquals(
	initialMemoryPages + iterations * deltaPages,
	instance.exports.main(kGrowFunction, iterations, deltaPages));
	})();

	// This test verifies that the effects of writing to memory grown in an
	// indirectly called function inside a loop are retained when the loop is over.
	(function TestMemoryGrowAndStoreInIndirectCallInsideLoop() {
	print('TestMemoryGrowAndStoreInIndirectCallInsideLoop ...');
	let builder = new WasmModuleBuilder();
	let deltaPages = 1;
	builder.addMemory(initialMemoryPages, maximumMemoryPages, true);
	let kGrowFunction =
	builder.addFunction('grow', kSig_i_i)
	.addBody([kExprGetLocal, 0, kExprMemoryGrow, kMemoryZero])
	.exportFunc()
	.index;
	builder.addFunction('store', kSig_i_ii)
	.addBody([
	kExprGetLocal, 0, kExprGetLocal, 1, kExprI32StoreMem, 0, 0,
	kExprGetLocal, 1
	])
	.exportFunc();
	builder
	.addFunction(
	// parameters: function_index, iterations, deltaPages, index
	'main', makeSig([kWasmI32, kWasmI32, kWasmI32, kWasmI32], [kWasmI32]))
	.addBody([
	// clang-format off
	kExprLoop, kWasmStmt, // while
	kExprGetLocal, 1, // -
	kExprIf, kWasmStmt, // if <param1> != 0
	// Grow memory.
	kExprGetLocal, 2, // get number of new pages
	kExprGetLocal, 0, // get index of the function
	kExprCallIndirect, 0, kTableZero, // call the function
	kExprDrop, // drop the result of grow
	// Increase counter in memory.
	kExprGetLocal, 3, // put index (for store)
	kExprGetLocal, 3, // 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, 1, // -
	kExprI32Const, 1, // -
	kExprI32Sub, // -
	kExprSetLocal, 1, // decrease <param1>
	kExprBr, 1, // continue
	kExprEnd, // end if
	kExprEnd, // end loop
	// Return the value
	kExprGetLocal, 3, // -
	kExprI32LoadMem, 0, 0 // load from grown memory
	// clang-format on
	])
	.exportFunc();
	builder.appendToTable([kGrowFunction]);
	// The caller should be aware that the memory was grown by the callee.
	let instance = builder.instantiate();
	let iterations = 4;
	let index = 0;
	let initialValue = 1;
	let expectedValue = initialValue + iterations;
	instance.exports.store(index, initialValue);
	assertEquals(
	expectedValue,
	instance.exports.main(kGrowFunction, iterations, deltaPages, index));
	})();