[wasm] Adding feature to JIT a wasm function at runtime and hook up the compiled code into the indi…

test/mjsunit/wasm/jit-single-function.js

+// Copyright 2015 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
+// Flags: --wasm-jit-prototype
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+var module = (function () {

[titzer, 2016/07/14 08:59:44]

There should be additional cctests for this functionality, to keep the JS API
out of the system under test.

[ritesht, 2016/07/14 18:10:00]

Acknowledged.

+  var builder = new WasmModuleBuilder();
+
+  var kSig_i_iiiii =
+      makeSig([kAstI32, kAstI32, kAstI32, kAstI32, kAstI32], [kAstI32]);
+
+  var sig_index2 = builder.addType(kSig_i_ii);
+  var sig_index5 = builder.addType(kSig_i_iiiii);
+
+  builder.addMemory(1, 1, true);
+  var wasm_bytes_sub = [
+      0,
+      kExprGetLocal, 0,
+      kExprGetLocal, 1,
+      kExprI32Sub
+  ];
+  builder.addDataSegment(0, wasm_bytes_sub, false);
+
+  var wasm_bytes_mul = [
+      0,
+      kExprGetLocal, 0,
+      kExprGetLocal, 1,
+      kExprI32Mul
+  ];
+  builder.addDataSegment(6, wasm_bytes_mul, false);
+
+  builder.addPadFunctionTable(10);
+  builder.addImport("add", sig_index2);
+  builder.addFunction("add", sig_index2)
+    .addBody([
+      kExprGetLocal, 0, kExprGetLocal, 1, kExprCallImport, kArity2, 0
+    ]);
+  builder.addFunction("main", sig_index5)
+    .addBody([
+      kExprGetLocal, 0,
+      kExprGetLocal, 1,
+      kExprGetLocal, 2,
+      kExprJITSingleFunction, sig_index2,
+      kExprGetLocal, 2,
+      kExprGetLocal, 3,
+      kExprGetLocal, 4,
+      kExprCallIndirect, kArity2, sig_index2
+    ])
+    .exportFunc()
+  builder.appendToTable([0, 1]);
+
+  return builder.instantiate({add: function(a, b) { return a + b | 0; }});
+})();
+
+// Check that the module exists
+assertFalse(module === undefined);
+assertFalse(module === null);
+assertFalse(module === 0);
+assertEquals("object", typeof module.exports);
+assertEquals("function", typeof module.exports.main);
+
+// Check that the bytes referred to lie in the bounds of the memory buffer
+assertTraps(kTrapMemOutOfBounds, "module.exports.main(0, 100000, 3, 55, 99)");
+assertTraps(kTrapMemOutOfBounds, "module.exports.main(65536, 1, 3, 55, 99)");
+
+// Check that the index lies in the bounds of the table size
+assertTraps(kTrapInvalidIndex, "module.exports.main(0, 6, 10, 55, 99)");
+assertTraps(kTrapInvalidIndex, "module.exports.main(0, 6, -1, 55, 99)");
+
+// args: base offset, size of func_bytes, index, param1, param2
+assertEquals(-444, module.exports.main(0, 6, 3, 555, 999)); // JIT sub function
+assertEquals(13, module.exports.main(0, 6, 9, 45, 32)); // JIT sub function
+assertEquals(187, module.exports.main(6, 6, 6, 17, 11)); // JIT mul function
+assertEquals(30525, module.exports.main(6, 6, 9, 555, 55)); // JIT mul function