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/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_JFR_WRITERS_JFRENCODERS_HPP
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#define SHARE_VM_JFR_WRITERS_JFRENCODERS_HPP
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#include "memory/allocation.hpp"
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#include "utilities/bytes.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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//
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// The Encoding policy prescribes a template
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// method taking a first parameter of type T.
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// This is the value to be encoded. The second
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// parameter is a memory address - where to write
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// the encoded value.
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// The encoder method(s) should return the
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// number of bytes encoded into that memory address.
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//
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// template <typename T>
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// size_t encoder(T value, u1* dest);
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//
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// The caller ensures the destination
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// address is not null and that T can be fitted
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// in encoded form.
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//
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// Encoding policy classes
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class BigEndianEncoderImpl {
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public:
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template <typename T>
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static size_t encode(T value, u1* dest);
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template <typename T>
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static size_t encode(const T* src, size_t len, u1* dest);
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template <typename T>
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static size_t encode_padded(T value, u1* dest);
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template <typename T>
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static size_t encode_padded(const T* src, size_t len, u1* dest);
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};
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template <typename T>
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inline size_t BigEndianEncoderImpl::encode(T value, u1* dest) {
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assert(dest != NULL, "invariant");
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switch (sizeof(T)) {
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case 1: {
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ShouldNotReachHere();
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return 0;
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}
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case 2: {
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Bytes::put_Java_u2(dest, value);
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return 2;
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}
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case 4: {
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Bytes::put_Java_u4(dest, value);
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return 4;
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}
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case 8: {
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Bytes::put_Java_u8(dest, value);
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return 8;
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}
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}
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ShouldNotReachHere();
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return 0;
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}
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template <typename T>
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inline size_t BigEndianEncoderImpl::encode(const T* src, size_t len, u1* dest) {
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assert(dest != NULL, "invariant");
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assert(len >= 1, "invariant");
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if (1 == sizeof(T)) {
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memcpy(dest, src, len);
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return len;
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}
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size_t size = encode(*src, dest);
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if (len > 1) {
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for (size_t i = 1; i < len; ++i) {
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size += encode(*(src + i), dest + size);
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}
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}
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return size;
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}
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template <typename T>
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inline size_t BigEndianEncoderImpl::encode_padded(T value, u1* dest) {
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return encode(value, dest);
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}
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template <typename T>
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inline size_t BigEndianEncoderImpl::encode_padded(const T* src, size_t len, u1* dest) {
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assert(dest != NULL, "invariant");
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assert(len >= 1, "invariant");
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if (1 == sizeof(T)) {
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memcpy(dest, src, len);
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return len;
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}
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size_t size = encode_padded(*src, dest);
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if (len > 1) {
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for (size_t i = 1; i < len; ++i) {
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size += encode_padded(*(src + i), dest + size);
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}
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}
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return size;
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}
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// The Varint128 encoder implements encoding according to
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// msb(it) 128bit encoding (1 encode bit | 7 value bits),
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// using least significant byte order.
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//
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// Example (little endian platform):
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// Value: 25674
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// Binary: 00000000 0000000 01100100 01001010
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// Varint encoded (3 bytes):
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// Value: 13289473
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// Varint encoded: 11001010 11001000 00000001
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//
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class Varint128EncoderImpl {
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private:
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template <typename T>
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static u8 to_u8(T value);
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public:
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template <typename T>
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static size_t encode(T value, u1* dest);
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template <typename T>
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static size_t encode(const T* src, size_t len, u1* dest);
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template <typename T>
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static size_t encode_padded(T value, u1* dest);
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template <typename T>
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static size_t encode_padded(const T* src, size_t len, u1* dest);
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};
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template <typename T>
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inline u8 Varint128EncoderImpl::to_u8(T value) {
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switch(sizeof(T)) {
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case 1:
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return static_cast<u8>(static_cast<u1>(value) & static_cast<u1>(0xff));
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case 2:
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return static_cast<u8>(static_cast<u2>(value) & static_cast<u2>(0xffff));
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case 4:
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return static_cast<u8>(static_cast<u4>(value) & static_cast<u4>(0xffffffff));
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case 8:
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return static_cast<u8>(value);
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default:
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fatal("unsupported type");
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}
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return 0;
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}
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static const u1 ext_bit = 0x80;
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#define GREATER_THAN_OR_EQUAL_TO_128(v) (((u8)(~(ext_bit - 1)) & (v)))
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#define LESS_THAN_128(v) !GREATER_THAN_OR_EQUAL_TO_128(v)
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template <typename T>
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inline size_t Varint128EncoderImpl::encode(T value, u1* dest) {
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assert(dest != NULL, "invariant");
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const u8 v = to_u8(value);
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if (LESS_THAN_128(v)) {
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*dest = static_cast<u1>(v); // set bit 0-6, no extension
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return 1;
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}
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*dest = static_cast<u1>(v | ext_bit); // set bit 0-6, with extension
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if (LESS_THAN_128(v >> 7)) {
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*(dest + 1) = static_cast<u1>(v >> 7); // set bit 7-13, no extension
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return 2;
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}
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*(dest + 1) = static_cast<u1>((v >> 7) | ext_bit); // set bit 7-13, with extension
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if (LESS_THAN_128(v >> 14)) {
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*(dest + 2) = static_cast<u1>(v >> 14); // set bit 14-20, no extension
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return 3;
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}
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*(dest + 2) = static_cast<u1>((v >> 14) | ext_bit); // set bit 14-20, with extension
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if (LESS_THAN_128(v >> 21)) {
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*(dest + 3) = static_cast<u1>(v >> 21); // set bit 21-27, no extension
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return 4;
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}
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*(dest + 3) = static_cast<u1>((v >> 21) | ext_bit); // set bit 21-27, with extension
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if (LESS_THAN_128(v >> 28)) {
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*(dest + 4) = static_cast<u1>(v >> 28); // set bit 28-34, no extension
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return 5;
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}
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*(dest + 4) = static_cast<u1>((v >> 28) | ext_bit); // set bit 28-34, with extension
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if (LESS_THAN_128(v >> 35)) {
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*(dest + 5) = static_cast<u1>(v >> 35); // set bit 35-41, no extension
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return 6;
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}
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*(dest + 5) = static_cast<u1>((v >> 35) | ext_bit); // set bit 35-41, with extension
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if (LESS_THAN_128(v >> 42)) {
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*(dest + 6) = static_cast<u1>(v >> 42); // set bit 42-48, no extension
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return 7;
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}
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*(dest + 6) = static_cast<u1>((v >> 42) | ext_bit); // set bit 42-48, with extension
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if (LESS_THAN_128(v >> 49)) {
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*(dest + 7) = static_cast<u1>(v >> 49); // set bit 49-55, no extension
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return 8;
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}
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*(dest + 7) = static_cast<u1>((v >> 49) | ext_bit); // set bit 49-55, with extension
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// no need to extend since only 64 bits allowed.
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*(dest + 8) = static_cast<u1>(v >> 56); // set bit 56-63
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return 9;
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}
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template <typename T>
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inline size_t Varint128EncoderImpl::encode(const T* src, size_t len, u1* dest) {
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assert(dest != NULL, "invariant");
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assert(len >= 1, "invariant");
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size_t size = encode(*src, dest);
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if (len > 1) {
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for (size_t i = 1; i < len; ++i) {
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size += encode(*(src + i), dest + size);
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}
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}
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return size;
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}
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template <typename T>
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inline size_t Varint128EncoderImpl::encode_padded(T value, u1* dest) {
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assert(dest != NULL, "invariant");
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const u8 v = to_u8(value);
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switch (sizeof(T)) {
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case 1:
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dest[0] = static_cast<u1>(v);
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return 1;
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case 2:
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dest[0] = static_cast<u1>(v | 0x80);
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dest[1] = static_cast<u1>(v >> 7);
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return 2;
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case 4:
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dest[0] = static_cast<u1>(v | 0x80);
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dest[1] = static_cast<u1>(v >> 7 | 0x80);
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dest[2] = static_cast<u1>(v >> 14 | 0x80);
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dest[3] = static_cast<u1>(v >> 21);
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return 4;
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case 8:
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dest[0] = static_cast<u1>(v | 0x80);
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dest[1] = static_cast<u1>(v >> 7 | 0x80);
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dest[2] = static_cast<u1>(v >> 14 | 0x80);
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dest[3] = static_cast<u1>(v >> 21 | 0x80);
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dest[4] = static_cast<u1>(v >> 28 | 0x80);
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dest[5] = static_cast<u1>(v >> 35 | 0x80);
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dest[6] = static_cast<u1>(v >> 42 | 0x80);
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dest[7] = static_cast<u1>(v >> 49);
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return 8;
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default:
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ShouldNotReachHere();
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}
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return 0;
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}
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template <typename T>
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inline size_t Varint128EncoderImpl::encode_padded(const T* src, size_t len, u1* dest) {
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assert(dest != NULL, "invariant");
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assert(len >= 1, "invariant");
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size_t size = encode_padded(*src, dest);
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if (len > 1) {
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for (size_t i = 1; i < len; ++i) {
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size += encode_padded(*(src + i), dest + size);
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}
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}
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return size;
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}
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#endif // SHARE_VM_JFR_WRITERS_JFRENCODERS_HPP
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