X87: Assembler support for internal references.

test/cctest/test-assembler-x87.cc

 // Copyright 2011 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
@@ skipping 294 matching lines @@
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
   CHECK(code->IsCode());
 
   F0 f = FUNCTION_CAST<F0>(code->entry());
   int res = f();
   CHECK_EQ(42, res);
 }
 
 
+TEST(AssemblerIa32JumpTables1) {
+  // Test jump tables with forward jumps.
+  CcTest::InitializeVM();
+  Isolate* isolate = reinterpret_cast<Isolate*>(CcTest::isolate());
+  HandleScope scope(isolate);
+  Assembler assm(isolate, nullptr, 0);
+
+  const int kNumCases = 512;
+  int values[kNumCases];
+  isolate->random_number_generator()->NextBytes(values, sizeof(values));
+  Label labels[kNumCases];
+
+  Label done, table;
+  __ mov(eax, Operand(esp, 4));
+  __ jmp(Operand::JumpTable(eax, times_4, &table));
+  __ ud2();
+  __ bind(&table);
+  for (int i = 0; i < kNumCases; ++i) {
+    __ dd(&labels[i]);
+  }
+
+  for (int i = 0; i < kNumCases; ++i) {
+    __ bind(&labels[i]);
+    __ mov(eax, Immediate(values[i]));
+    __ jmp(&done);
+  }
+
+  __ bind(&done);
+  __ ret(0);
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Handle<Code> code = isolate->factory()->NewCode(
+      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+#ifdef OBJECT_PRINT
+  OFStream os(stdout);
+  code->Print(os);
+#endif
+  F1 f = FUNCTION_CAST<F1>(code->entry());
+  for (int i = 0; i < kNumCases; ++i) {
+    int res = f(i);
+    ::printf("f(%d) = %d\n", i, res);
+    CHECK_EQ(values[i], res);
+  }
+}
+
+
+TEST(AssemblerIa32JumpTables2) {
+  // Test jump tables with backward jumps.
+  CcTest::InitializeVM();
+  Isolate* isolate = reinterpret_cast<Isolate*>(CcTest::isolate());
+  HandleScope scope(isolate);
+  Assembler assm(isolate, nullptr, 0);
+
+  const int kNumCases = 512;
+  int values[kNumCases];
+  isolate->random_number_generator()->NextBytes(values, sizeof(values));
+  Label labels[kNumCases];
+
+  Label done, table;
+  __ mov(eax, Operand(esp, 4));
+  __ jmp(Operand::JumpTable(eax, times_4, &table));
+  __ ud2();
+
+  for (int i = 0; i < kNumCases; ++i) {
+    __ bind(&labels[i]);
+    __ mov(eax, Immediate(values[i]));
+    __ jmp(&done);
+  }
+
+  __ bind(&table);
+  for (int i = 0; i < kNumCases; ++i) {
+    __ dd(&labels[i]);
+  }
+
+  __ bind(&done);
+  __ ret(0);
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Handle<Code> code = isolate->factory()->NewCode(
+      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+#ifdef OBJECT_PRINT
+  OFStream os(stdout);
+  code->Print(os);
+#endif
+  F1 f = FUNCTION_CAST<F1>(code->entry());
+  for (int i = 0; i < kNumCases; ++i) {
+    int res = f(i);
+    ::printf("f(%d) = %d\n", i, res);
+    CHECK_EQ(values[i], res);
+  }
+}
+
 #undef __