Assembler changes for enabling GrowHeap in Wasm

test/cctest/test-run-wasm-relocation-arm.cc

+// 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.
+
+#include <iostream>  // NOLINT(readability/streams)
+
+#include "src/v8.h"
+#include "test/cctest/cctest.h"
+
+#include "src/arm/assembler-arm-inl.h"
+#include "src/arm/simulator-arm.h"
+#include "src/disassembler.h"
+#include "src/factory.h"
+#include "src/ostreams.h"
+#include "test/cctest/compiler/c-signature.h"
+#include "test/cctest/compiler/call-tester.h"
+
+using namespace v8::base;
+using namespace v8::internal;
+using namespace v8::internal::compiler;
+
+#define __ assm.
+
+static int32_t DummyStaticFunction(Object* result) { return 1; }
+
+TEST(WasmRelocationArm) {
+  CcTest::InitializeVM();
+  Isolate* isolate = CcTest::i_isolate();
+  HandleScope scope(isolate);
+  v8::internal::byte buffer[4096];
+  DummyStaticFunction(NULL);
+  int32_t imm = 1234567;
+
+  Assembler assm(isolate, buffer, sizeof buffer);
+
+  __ mov(r0, Operand(imm, RelocInfo::WASM_MEMORY_REFERENCE));
+  __ mov(pc, Operand(lr));
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Handle<Code> code = isolate->factory()->NewCode(
+      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+
+  CSignature0<int32_t> csig;
+  CodeRunner<int32_t> runnable(isolate, code, &csig);
+  int32_t ret_value = runnable.Call();
+  CHECK_EQ(ret_value, imm);
+
+#ifdef DEBUG
+  OFStream os(stdout);
+  code->Print(os);
+  ::printf("f() = %d\n\n", ret_value);
+#endif
+  size_t offset = 1234;
+
+  // Relocating references by offset
+  int mode_mask = (1 << RelocInfo::WASM_MEMORY_REFERENCE);
+  for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
+    RelocInfo::Mode mode = it.rinfo()->rmode();
+    if (RelocInfo::IsWasmMemoryReference(mode)) {
+      // Dummy values of size used here as the objective of the test is to
+      // verify that the immediate is patched correctly
+      it.rinfo()->update_wasm_memory_reference(
+          it.rinfo()->wasm_memory_reference(),
+          it.rinfo()->wasm_memory_reference() + offset, 1, 2,
+          SKIP_ICACHE_FLUSH);
+    }
+  }
+
+  // Call into relocated code object
+  ret_value = runnable.Call();
+  CHECK_EQ((imm + offset), ret_value);
+
+#ifdef DEBUG
+  code->Print(os);
+  ::printf("f() = %d\n\n", ret_value);
+#endif
+}
+
+#undef __