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// Copyright 2014 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 "src/v8.h"
#include "src/interpreter/bytecode-array-builder.h"
#include "src/interpreter/bytecode-register-allocator.h"
#include "src/objects-inl.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodeRegisterAllocatorTest : public TestWithIsolateAndZone {
public:
BytecodeRegisterAllocatorTest() : allocator_(0) {}
~BytecodeRegisterAllocatorTest() override = default;
BytecodeRegisterAllocator* allocator() { return &allocator_; }
private:
BytecodeRegisterAllocator allocator_;
};
TEST_F(BytecodeRegisterAllocatorTest, SimpleAllocations) {
CHECK_EQ(allocator()->maximum_register_count(), 0);
Register reg0 = allocator()->NewRegister();
CHECK_EQ(reg0.index(), 0);
CHECK_EQ(allocator()->maximum_register_count(), 1);
CHECK_EQ(allocator()->next_register_index(), 1);
CHECK(allocator()->RegisterIsLive(reg0));
allocator()->ReleaseRegisters(0);
CHECK(!allocator()->RegisterIsLive(reg0));
CHECK_EQ(allocator()->maximum_register_count(), 1);
CHECK_EQ(allocator()->next_register_index(), 0);
reg0 = allocator()->NewRegister();
Register reg1 = allocator()->NewRegister();
CHECK_EQ(reg0.index(), 0);
CHECK_EQ(reg1.index(), 1);
CHECK(allocator()->RegisterIsLive(reg0));
CHECK(allocator()->RegisterIsLive(reg1));
CHECK_EQ(allocator()->maximum_register_count(), 2);
CHECK_EQ(allocator()->next_register_index(), 2);
allocator()->ReleaseRegisters(1);
CHECK(allocator()->RegisterIsLive(reg0));
CHECK(!allocator()->RegisterIsLive(reg1));
CHECK_EQ(allocator()->maximum_register_count(), 2);
CHECK_EQ(allocator()->next_register_index(), 1);
}
TEST_F(BytecodeRegisterAllocatorTest, RegisterListAllocations) {
CHECK_EQ(allocator()->maximum_register_count(), 0);
RegisterList reg_list = allocator()->NewRegisterList(3);
CHECK_EQ(reg_list.first_register().index(), 0);
CHECK_EQ(reg_list.register_count(), 3);
CHECK_EQ(reg_list[0].index(), 0);
CHECK_EQ(reg_list[1].index(), 1);
CHECK_EQ(reg_list[2].index(), 2);
CHECK_EQ(allocator()->maximum_register_count(), 3);
CHECK_EQ(allocator()->next_register_index(), 3);
CHECK(allocator()->RegisterIsLive(reg_list[2]));
Register reg = allocator()->NewRegister();
RegisterList reg_list_2 = allocator()->NewRegisterList(2);
CHECK_EQ(reg.index(), 3);
CHECK_EQ(reg_list_2.first_register().index(), 4);
CHECK_EQ(reg_list_2.register_count(), 2);
CHECK_EQ(reg_list_2[0].index(), 4);
CHECK_EQ(reg_list_2[1].index(), 5);
CHECK_EQ(allocator()->maximum_register_count(), 6);
CHECK_EQ(allocator()->next_register_index(), 6);
CHECK(allocator()->RegisterIsLive(reg));
CHECK(allocator()->RegisterIsLive(reg_list_2[1]));
allocator()->ReleaseRegisters(reg.index());
CHECK(!allocator()->RegisterIsLive(reg));
CHECK(!allocator()->RegisterIsLive(reg_list_2[0]));
CHECK(!allocator()->RegisterIsLive(reg_list_2[1]));
CHECK(allocator()->RegisterIsLive(reg_list[2]));
CHECK_EQ(allocator()->maximum_register_count(), 6);
CHECK_EQ(allocator()->next_register_index(), 3);
RegisterList empty_reg_list = allocator()->NewRegisterList(0);
CHECK_EQ(empty_reg_list.first_register().index(), 0);
CHECK_EQ(empty_reg_list.register_count(), 0);
CHECK_EQ(allocator()->maximum_register_count(), 6);
CHECK_EQ(allocator()->next_register_index(), 3);
}
TEST_F(BytecodeRegisterAllocatorTest, GrowableRegisterListAllocations) {
CHECK_EQ(allocator()->maximum_register_count(), 0);
Register reg = allocator()->NewRegister();
CHECK_EQ(reg.index(), 0);
RegisterList reg_list = allocator()->NewGrowableRegisterList();
CHECK_EQ(reg_list.register_count(), 0);
allocator()->GrowRegisterList(®_list);
allocator()->GrowRegisterList(®_list);
allocator()->GrowRegisterList(®_list);
CHECK_EQ(reg_list.register_count(), 3);
CHECK_EQ(reg_list[0].index(), 1);
CHECK_EQ(reg_list[1].index(), 2);
CHECK_EQ(reg_list[2].index(), 3);
CHECK_EQ(allocator()->maximum_register_count(), 4);
CHECK_EQ(allocator()->next_register_index(), 4);
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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