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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "src/v8.h"
      6 
      7 #include "src/interpreter/bytecode-array-builder.h"
      8 #include "src/interpreter/bytecode-register-allocator.h"
      9 #include "test/unittests/test-utils.h"
     10 
     11 namespace v8 {
     12 namespace internal {
     13 namespace interpreter {
     14 
     15 class BytecodeRegisterAllocatorTest : public TestWithIsolateAndZone {
     16  public:
     17   BytecodeRegisterAllocatorTest() {}
     18   ~BytecodeRegisterAllocatorTest() override {}
     19 };
     20 
     21 
     22 TEST_F(BytecodeRegisterAllocatorTest, TemporariesRecycled) {
     23   BytecodeArrayBuilder builder(isolate(), zone());
     24   builder.set_parameter_count(0);
     25   builder.set_locals_count(0);
     26   builder.set_context_count(0);
     27 
     28   int first;
     29   {
     30     BytecodeRegisterAllocator temporaries(&builder);
     31     first = temporaries.NewRegister().index();
     32     temporaries.NewRegister();
     33     temporaries.NewRegister();
     34     temporaries.NewRegister();
     35   }
     36 
     37   int second;
     38   {
     39     BytecodeRegisterAllocator temporaries(&builder);
     40     second = temporaries.NewRegister().index();
     41   }
     42 
     43   CHECK_EQ(first, second);
     44 }
     45 
     46 
     47 TEST_F(BytecodeRegisterAllocatorTest, ConsecutiveRegisters) {
     48   BytecodeArrayBuilder builder(isolate(), zone());
     49   builder.set_parameter_count(0);
     50   builder.set_locals_count(0);
     51   builder.set_context_count(0);
     52 
     53   BytecodeRegisterAllocator temporaries(&builder);
     54   temporaries.PrepareForConsecutiveAllocations(4);
     55   Register reg0 = temporaries.NextConsecutiveRegister();
     56   Register other = temporaries.NewRegister();
     57   Register reg1 = temporaries.NextConsecutiveRegister();
     58   Register reg2 = temporaries.NextConsecutiveRegister();
     59   Register reg3 = temporaries.NextConsecutiveRegister();
     60   USE(other);
     61 
     62   CHECK(Register::AreContiguous(reg0, reg1, reg2, reg3));
     63 }
     64 
     65 }  // namespace interpreter
     66 }  // namespace internal
     67 }  // namespace v8
     68