Implement Wasm GrowMemory opcode as a wasm runtime call

test/mjsunit/wasm/grow-memory.js

Index: test/mjsunit/wasm/grow-memory.js
diff --git a/test/mjsunit/wasm/grow-memory.js b/test/mjsunit/wasm/grow-memory.js
new file mode 100644
index 0000000000000000000000000000000000000000..cb90a464825e6c07becb771624422e95d8267192
--- /dev/null
+++ b/test/mjsunit/wasm/grow-memory.js
@@ -0,0 +1,137 @@
+// Copyright 2016 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 --expose-gc --stress-compaction
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+var kPageSize = 0x10000;
+
+function genGrowMemoryBuilder() {
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("grow_memory", kSig_i_i)
+      .addBody([kExprGetLocal, 0, kExprGrowMemory])
+      .exportFunc();
+  builder.addFunction("load", kSig_i_i)
+      .addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
+      .exportFunc();
+  builder.addFunction("store", kSig_i_ii)
+      .addBody([kExprGetLocal, 0, kExprGetLocal, 1, kExprI32StoreMem, 0, 0])
+      .exportFunc();
+  return builder;
+}
+
+function testGrowMemoryReadWrite() {
+  var builder = genGrowMemoryBuilder();
+  builder.addMemory(1, 1, false);
+  var module = builder.instantiate();
+  var offset;
+  function peek() { return module.exports.load(offset); }
+  function poke(value) { return module.exports.store(offset, value); }
+  function growMem(pages) { return module.exports.grow_memory(pages); }
+
+  for(offset = 0; offset <= (kPageSize - 4); offset++) {
+    poke(20);
+    assertEquals(peek(), 20);
+  }
+  for (offset = kPageSize - 3; offset < kPageSize + 4; offset++) {
+    assertTraps(kTrapMemOutOfBounds, poke);
+    assertTraps(kTrapMemOutOfBounds, peek);
+  }
+
+  try {
+    assertEquals(growMem(3), 1);
+  } catch (e) {
+    assertEquals("object", typeof e);
+    assertEquals(e.message, kTrapMsgs[kTrapMemAllocationFail]);
+    return;
+  }
+
+  for (offset = kPageSize; offset <= 4*kPageSize -4; offset++) {
+    poke(20);
+    assertEquals(peek(), 20);
+  }
+  for (offset = 4*kPageSize - 3; offset < 4*kPageSize + 4; offset++) {
+    assertTraps(kTrapMemOutOfBounds, poke);
+    assertTraps(kTrapMemOutOfBounds, peek);
+  }
+
+  try {
+    assertEquals(growMem(15), 4);
+  } catch (e) {
+    assertEquals("object", typeof e);
+    assertEquals(e.message, kTrapMsgs[kTrapMemAllocationFail]);
+    return;
+  }
+
+  for (offset = 4*kPageSize - 3; offset <= 4*kPageSize + 4; offset++) {
+    poke(20);
+    assertEquals(peek(), 20);
+  }
+  for (offset = 19*kPageSize - 10; offset <= 19*kPageSize - 4; offset++) {
+    poke(20);
+    assertEquals(peek(), 20);
+  }
+  for (offset = 19*kPageSize - 3; offset < 19*kPageSize + 5; offset++) {
+    assertTraps(kTrapMemOutOfBounds, poke);
+    assertTraps(kTrapMemOutOfBounds, peek);
+  }
+}
+
+testGrowMemoryReadWrite();
+
+function testGrowMemoryZeroInitialSize() {
+  var builder = genGrowMemoryBuilder();
+  var module = builder.instantiate();
+  var offset;
+  function peek() { return module.exports.load(offset); }
+  function poke(value) { return module.exports.store(offset, value); }
+  function growMem(pages) { return module.exports.grow_memory(pages); }
+
+  assertTraps(kTrapMemOutOfBounds, peek);
+  assertTraps(kTrapMemOutOfBounds, poke);
+
+  try {
+    assertEquals(growMem(1), 0);
+  } catch (e) {
+    assertEquals("object", typeof e);
+    assertEquals(e.message, kTrapMsgs[kTrapMemAllocationFail]);
+    return;
+  }
+
+  for(offset = 0; offset <= kPageSize - 4; offset++) {
+    poke(20);
+    assertEquals(peek(), 20);
+  }
+
+  //TODO(gdeepti): Fix tests with correct write boundaries
+  //when runtime function is fixed.
+  for(offset = kPageSize; offset <= kPageSize + 5; offset++) {
+    assertTraps(kTrapMemOutOfBounds, peek);
+  }
+}
+
+testGrowMemoryZeroInitialSize();
+
+function testGrowMemoryTrapMaxPagesZeroInitialMemory() {
+  var builder = genGrowMemoryBuilder();
+  var module = builder.instantiate();
+  var maxPages = 16385;
+  function growMem() { return module.exports.grow_memory(maxPages); }
+  assertTraps(kTrapMemOutOfBounds, growMem);
+}
+
+testGrowMemoryTrapMaxPagesZeroInitialMemory();
+
+function testGrowMemoryTrapMaxPages() {
+  var builder = genGrowMemoryBuilder();
+  builder.addMemory(1, 1, false);
+  var module = builder.instantiate();
+  var maxPages = 16384;
+  function growMem() { return module.exports.grow_memory(maxPages); }
+  assertTraps(kTrapMemOutOfBounds, growMem);
+}
+
+testGrowMemoryTrapMaxPages();