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author | Nicolas Geoffray <ngeoffray@google.com> | 2014-04-11 17:43:50 +0100 |
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committer | Nicolas Geoffray <ngeoffray@google.com> | 2014-04-16 14:21:12 +0100 |
commit | 01bc96d007b67fdb7fe349232a83e4b354ce3d08 (patch) | |
tree | 1ed36c2d7c0fb204e6f276bd9853153d9350ad1d /runtime/base | |
parent | 2be6fc74bce10ac68d3d1b39a5019f520ad170ea (diff) | |
download | art-01bc96d007b67fdb7fe349232a83e4b354ce3d08.zip art-01bc96d007b67fdb7fe349232a83e4b354ce3d08.tar.gz art-01bc96d007b67fdb7fe349232a83e4b354ce3d08.tar.bz2 |
Long support in optimizing compiler.
- Add stack locations to the Location class.
- Change logic of parameter passing/setup by setting the
location of such instructions the ones for the calling
convention.
Change-Id: I4730ad58732813dcb9c238f44f55dfc0baa18799
Diffstat (limited to 'runtime/base')
-rw-r--r-- | runtime/base/bit_field.h | 82 | ||||
-rw-r--r-- | runtime/base/bit_field_test.cc | 37 |
2 files changed, 119 insertions, 0 deletions
diff --git a/runtime/base/bit_field.h b/runtime/base/bit_field.h new file mode 100644 index 0000000..e041bd0 --- /dev/null +++ b/runtime/base/bit_field.h @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2014 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef ART_RUNTIME_BASE_BIT_FIELD_H_ +#define ART_RUNTIME_BASE_BIT_FIELD_H_ + +#include "globals.h" +#include "logging.h" + +namespace art { + +static const uword kUwordOne = 1U; + +// BitField is a template for encoding and decoding a bit field inside +// an unsigned machine word. +template<typename T, int position, int size> +class BitField { + public: + // Tells whether the provided value fits into the bit field. + static bool IsValid(T value) { + return (static_cast<uword>(value) & ~((kUwordOne << size) - 1)) == 0; + } + + // Returns a uword mask of the bit field. + static uword Mask() { + return (kUwordOne << size) - 1; + } + + // Returns a uword mask of the bit field which can be applied directly to + // the raw unshifted bits. + static uword MaskInPlace() { + return ((kUwordOne << size) - 1) << position; + } + + // Returns the shift count needed to right-shift the bit field to + // the least-significant bits. + static int Shift() { + return position; + } + + // Returns the size of the bit field. + static int BitSize() { + return size; + } + + // Returns a uword with the bit field value encoded. + static uword Encode(T value) { + DCHECK(IsValid(value)); + return static_cast<uword>(value) << position; + } + + // Extracts the bit field from the value. + static T Decode(uword value) { + return static_cast<T>((value >> position) & ((kUwordOne << size) - 1)); + } + + // Returns a uword with the bit field value encoded based on the + // original value. Only the bits corresponding to this bit field + // will be changed. + static uword Update(T value, uword original) { + DCHECK(IsValid(value)); + return (static_cast<uword>(value) << position) | + (~MaskInPlace() & original); + } +}; + +} // namespace art + +#endif // ART_RUNTIME_BASE_BIT_FIELD_H_ diff --git a/runtime/base/bit_field_test.cc b/runtime/base/bit_field_test.cc new file mode 100644 index 0000000..afeb2c4 --- /dev/null +++ b/runtime/base/bit_field_test.cc @@ -0,0 +1,37 @@ +/* + * Copyright (C) 2014 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "bit_field.h" +#include "globals.h" + +#include "gtest/gtest.h" + +namespace art { + +TEST(BitFields, Test1) { + class TestBitFields : public BitField<int32_t, 1, 8> {}; + ASSERT_TRUE(TestBitFields::IsValid(16)); + ASSERT_TRUE(!TestBitFields::IsValid(256)); + ASSERT_EQ(0x00ffU, TestBitFields::Mask()); + ASSERT_EQ(0x001feU, TestBitFields::MaskInPlace()); + ASSERT_EQ(1, TestBitFields::Shift()); + ASSERT_EQ(8, TestBitFields::BitSize()); + ASSERT_EQ(32U, TestBitFields::Encode(16)); + ASSERT_EQ(16, TestBitFields::Decode(32)); + ASSERT_EQ(2U, TestBitFields::Update(1, 16)); +} + +} // namespace art |