[compiler] Add relocatable pointer constants for wasm memory references.

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

-// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright 2016 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Check that we can traverse very deep stacks of ConsStrings using
-// StringCharacterStram.  Check that Get(int) works on very deep stacks
-// of ConsStrings.  These operations may not be very fast, but they
-// should be possible without getting errors due to too deep recursion.
+#include <iostream>  // NOLINT(readability/streams)
 
 #include "src/v8.h"
-
-#include "src/objects.h"
-#include "src/ostreams.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.
 
-TEST(Create) {
+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;
 
-  const int kNumSymbols = 30;
-  Handle<Symbol> symbols[kNumSymbols];
+  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);
-  for (int i = 0; i < kNumSymbols; ++i) {
-    symbols[i] = isolate->factory()->NewSymbol();
-    CHECK(symbols[i]->IsName());
-    CHECK(symbols[i]->IsSymbol());
-    CHECK(symbols[i]->HasHashCode());
-    CHECK_GT(symbols[i]->Hash(), 0u);
-    os << Brief(*symbols[i]) << "\n";
-#if OBJECT_PRINT
-    symbols[i]->Print(os);
+  code->Print(os);
+  ::printf("f() = %d\n\n", ret_value);
 #endif
-#if VERIFY_HEAP
-    symbols[i]->ObjectVerify();
-#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)) {
+      it.rinfo()->update_wasm_memory_reference(
+          it.rinfo()->wasm_memory_reference() + offset, SKIP_ICACHE_FLUSH);
+    }
   }
 
-  CcTest::heap()->CollectGarbage(i::NEW_SPACE);
-  CcTest::heap()->CollectAllGarbage();
+  // Call into relocated code object
+  ret_value = runnable.Call();
+  CHECK_EQ((imm + offset), ret_value);
 
-  // All symbols should be distinct.
-  for (int i = 0; i < kNumSymbols; ++i) {
-    CHECK(symbols[i]->SameValue(*symbols[i]));
-    for (int j = i + 1; j < kNumSymbols; ++j) {
-      CHECK(!symbols[i]->SameValue(*symbols[j]));
-    }
-  }
+#ifdef DEBUG
+  code->Print(os);
+  ::printf("f() = %d\n\n", ret_value);
+#endif
 }
+
+#undef __