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Revert "[vm] Switch datastream Write/WriteUnsigned to (S)LEB128."

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This reverts commit 80102c981b.

Reason for revert: b/186359854

Original change's description:
> [vm] Switch datastream Write/WriteUnsigned to (S)LEB128.
>
> This reduces the number of variable-length integer encodings in our
> database from 2 to 1, and chooses the more standard one.
>
> TEST=Existing tests, in particular any that involve snapshots.
>
> Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-asan-linux-release-x64-try,vm-kernel-precomp-dwarf-linux-product-x64-try,vm-kernel-precomp-msan-linux-release-x64-try,vm-kernel-precomp-ubsan-linux-release-x64-try,vm-kernel-precomp-tsan-linux-release-x64-try,vm-kernel-precomp-nnbd-linux-debug-x64-try,vm-kernel-precomp-nnbd-linux-debug-simarm_x64-try,vm-kernel-precomp-linux-debug-simarm64c-try,vm-kernel-precomp-linux-debug-simarm_x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-debug-x64c-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-linux-release-x64-try
> Change-Id: Ia700158ac873ad32ac28c1027a669895961bc715
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196321
> Commit-Queue: Tess Strickland <sstrickl@google.com>
> Reviewed-by: Ryan Macnak <rmacnak@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Idf32bdd879cf8bb7407f6dae764312140ad6eeb2
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-asan-linux-release-x64-try,vm-kernel-precomp-dwarf-linux-product-x64-try,vm-kernel-precomp-msan-linux-release-x64-try,vm-kernel-precomp-ubsan-linux-release-x64-try,vm-kernel-precomp-tsan-linux-release-x64-try,vm-kernel-precomp-nnbd-linux-debug-x64-try,vm-kernel-precomp-nnbd-linux-debug-simarm_x64-try,vm-kernel-precomp-linux-debug-simarm64c-try,vm-kernel-precomp-linux-debug-simarm_x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-debug-x64c-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196920
Reviewed-by: Ivan Inozemtsev <iinozemtsev@google.com>
Commit-Queue: Ivan Inozemtsev <iinozemtsev@google.com>
This commit is contained in:
Ivan Inozemtsev 2021-04-26 07:52:47 +00:00 committed by commit-bot@chromium.org
parent 50de84a3fb
commit a5ff656da1
14 changed files with 251 additions and 187 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
runtime/platform/utils.h
View file

@ -395,23 +395,29 @@ class Utils {
return ((-0x20000000000000LL <= value) && (value <= 0x20000000000000LL));
}
static constexpr uword NBitMaskUnsafe(uint32_t n) {
static_assert((sizeof(uword) * kBitsPerByte) == kBitsPerWord,
"Unexpected uword size");
return n == kBitsPerWord ? std::numeric_limits<uword>::max()
: (static_cast<uword>(1) << n) - 1;
}
// The lowest n bits are 1, the others are 0.
template <typename T = uword>
static constexpr T NBitMask(size_t n) {
static_assert(std::is_integral<T>::value, "Must be integral type");
using Unsigned = typename std::make_unsigned<T>::type;
assert(n <= sizeof(T) * kBitsPerByte);
return n == sizeof(T) * kBitsPerByte
? static_cast<T>(-1)
: static_cast<T>((static_cast<Unsigned>(1) << n) - 1);
static uword NBitMask(uint32_t n) {
ASSERT(n <= kBitsPerWord);
return NBitMaskUnsafe(n);
}
static word SignedNBitMask(uint32_t n) {
uword mask = NBitMask(n);
return bit_cast<word>(mask);
}
template <typename T = uword>
static constexpr T Bit(size_t n) {
static_assert(std::is_integral<T>::value, "Must be integral type");
using Unsigned = typename std::make_unsigned<T>::type;
assert(n < sizeof(T) * kBitsPerByte);
return static_cast<T>(static_cast<Unsigned>(1) << n);
static T Bit(uint32_t n) {
ASSERT(n < sizeof(T) * kBitsPerByte);
T bit = 1;
return bit << n;
}
template <typename T>

14
runtime/vm/code_descriptors.cc
View file

@ -54,8 +54,8 @@ void DescriptorList::AddDescriptor(UntaggedPcDescriptors::Kind kind,
UntaggedPcDescriptors::KindAndMetadata::Encode(kind, try_index,
yield_index);
encoded_data_.Write(kind_and_metadata);
encoded_data_.Write(pc_offset - prev_pc_offset);
encoded_data_.WriteSLEB128(kind_and_metadata);
encoded_data_.WriteSLEB128(pc_offset - prev_pc_offset);
prev_pc_offset = pc_offset;
if (!FLAG_precompiled_mode) {
@ -80,8 +80,8 @@ void DescriptorList::AddDescriptor(UntaggedPcDescriptors::Kind kind,
}
}
const int32_t encoded_pos = token_pos.Serialize();
encoded_data_.Write(deopt_id - prev_deopt_id);
encoded_data_.Write(
encoded_data_.WriteSLEB128(deopt_id - prev_deopt_id);
encoded_data_.WriteSLEB128(
Utils::SubWithWrapAround(encoded_pos, prev_token_pos));
prev_deopt_id = deopt_id;
prev_token_pos = encoded_pos;
@ -106,9 +106,9 @@ void CompressedStackMapsBuilder::AddEntry(intptr_t pc_offset,
const uword pc_delta = pc_offset - last_pc_offset_;
const uword non_spill_slot_bit_count =
bitmap->Length() - spill_slot_bit_count;
encoded_bytes_.WriteUnsigned(pc_delta);
encoded_bytes_.WriteUnsigned(spill_slot_bit_count);
encoded_bytes_.WriteUnsigned(non_spill_slot_bit_count);
encoded_bytes_.WriteLEB128(pc_delta);
encoded_bytes_.WriteLEB128(spill_slot_bit_count);
encoded_bytes_.WriteLEB128(non_spill_slot_bit_count);
bitmap->AppendAsBytesTo(&encoded_bytes_);
last_pc_offset_ = pc_offset;
}

2
runtime/vm/code_descriptors.h
View file

@ -209,7 +209,7 @@ struct CodeSourceMapOps : AllStatic {
using ArgField = BitField<int32_t, int32_t, OpField::kNextBit>;
static constexpr int32_t kMaxArgValue =
Utils::NBitMask(ArgField::bitsize() - 1);
Utils::NBitMaskUnsafe(ArgField::bitsize() - 1);
static constexpr int32_t kMinArgValue = ~kMaxArgValue;
static constexpr int32_t kSignBits = static_cast<uint32_t>(kMinArgValue) << 1;
};

4
runtime/vm/compiler/backend/il_arm.cc
View file

@ -778,8 +778,8 @@ LocationSummary* AssertAssignableInstr::MakeLocationSummary(Zone* zone,
const intptr_t kCpuRegistersToPreserve =
kDartAvailableCpuRegs & ~kNonChangeableInputRegs;
const intptr_t kFpuRegistersToPreserve =
Utils::NBitMask<word>(kNumberOfFpuRegisters) &
~(Utils::NBitMask<word>(kAbiPreservedFpuRegCount)
Utils::SignedNBitMask(kNumberOfFpuRegisters) &
~(Utils::SignedNBitMask(kAbiPreservedFpuRegCount)
<< kAbiFirstPreservedFpuReg) &
~(1 << FpuTMP);

2
runtime/vm/compiler/backend/il_arm64.cc
View file

@ -689,7 +689,7 @@ LocationSummary* AssertAssignableInstr::MakeLocationSummary(Zone* zone,
const intptr_t kCpuRegistersToPreserve =
kDartAvailableCpuRegs & ~kNonChangeableInputRegs;
const intptr_t kFpuRegistersToPreserve =
Utils::NBitMask<word>(kNumberOfFpuRegisters) & ~Utils::Bit(FpuTMP);
Utils::SignedNBitMask(kNumberOfFpuRegisters) & ~(1l << FpuTMP);
const intptr_t kNumTemps = (Utils::CountOneBits64(kCpuRegistersToPreserve) +
Utils::CountOneBits64(kFpuRegistersToPreserve));

115
runtime/vm/datastream.cc
View file

@ -4,126 +4,11 @@
#include "vm/datastream.h"
#include "platform/text_buffer.h"
#include "vm/compiler/runtime_api.h"
#include "vm/os.h"
#include "vm/zone.h"
namespace dart {
// Setting up needed variables for the unrolled loop sections below.
#define UNROLLED_INIT() \
using Unsigned = typename std::make_unsigned<T>::type; \
Unsigned b = ReadByte(); \
if ((b & C::kMoreDataMask) == 0) { \
if ((b & C::kSignMask) != 0) { \
b |= ~Utils::NBitMask<Unsigned>(C::kDataBitsPerByte); \
} \
return static_cast<T>(b); \
} \
T r = static_cast<T>(b & C::kDataByteMask);
// Part of the unrolled loop where the loop may stop, having read the last part,
// or continue reading.
#define UNROLLED_BODY(bit_start) \
static_assert(bit_start % C::kDataBitsPerByte == 0, \
"Bit start must be a multiple of the data bits per byte"); \
static_assert(bit_start >= 0 && bit_start < kBitsPerByte * sizeof(T), \
"Starting unrolled body at invalid bit position"); \
static_assert(bit_start + C::kDataBitsPerByte < kBitsPerByte * sizeof(T), \
"Unrolled body should not contain final bits in value"); \
b = ReadByte(); \
r |= static_cast<Unsigned>(b & C::kDataByteMask) << bit_start; \
if ((b & C::kMoreDataMask) == 0) { \
if ((b & C::kSignMask) != 0) { \
r |= ~Utils::NBitMask<T>(bit_start + C::kDataBitsPerByte); \
} \
return r; \
}
// The end of the unrolled loop. Does not need to handle sign extension, as the
// last bits fill the rest of the bitspace.
#define UNROLLED_END(bit_start) \
static_assert(bit_start % C::kDataBitsPerByte == 0, \
"Bit start must be a multiple of the data bits per byte"); \
static_assert(bit_start >= 0 && bit_start < kBitsPerByte * sizeof(T), \
"Starting unrolled end at invalid bit position"); \
static_assert(bit_start + C::kDataBitsPerByte >= kBitsPerByte * sizeof(T), \
"Unrolled end does not contain final bits in value"); \
b = ReadByte(); \
ASSERT_EQUAL((b & C::kMoreDataMask), 0); \
r |= static_cast<Unsigned>(b & C::kDataByteMask) << bit_start; \
return r;
uint16_t ReadStream::Read16() {
using T = uint16_t;
UNROLLED_INIT();
UNROLLED_BODY(7);
UNROLLED_END(14);
}
uint32_t ReadStream::Read32() {
using T = uint32_t;
UNROLLED_INIT();
UNROLLED_BODY(7);
UNROLLED_BODY(14);
UNROLLED_BODY(21);
UNROLLED_END(28);
}
uint64_t ReadStream::Read64() {
using T = uint64_t;
UNROLLED_INIT();
UNROLLED_BODY(7);
UNROLLED_BODY(14);
UNROLLED_BODY(21);
UNROLLED_BODY(28);
UNROLLED_BODY(35);
UNROLLED_BODY(42);
UNROLLED_BODY(49);
UNROLLED_BODY(56);
UNROLLED_END(63);
}
#undef UNROLLED_INIT
#undef UNROLLED_BODY
#undef UNROLLED_END
static constexpr intptr_t kRowSize = 16;
void ReadStream::WriteWindow(BaseTextBuffer* buffer,
intptr_t start,
intptr_t window_size) {
const intptr_t buffer_size = end_ - buffer_;
ASSERT(0 <= start && start <= buffer_size);
intptr_t window_start = start - (window_size / 2);
intptr_t window_end = start + (window_size / 2);
if (window_start < 0) window_start = 0;
if (buffer_size < window_start + window_end) window_end = buffer_size;
for (intptr_t i = window_start - (window_start % kRowSize); i < window_end;
i += kRowSize) {
buffer->Printf("%016" Px " ", i);
intptr_t j = i;
if (j < window_start) {
while (j < window_start) {
buffer->AddString(" ");
++j;
}
}
for (; j < Utils::Minimum(window_end, i + kRowSize); j++) {
buffer->AddChar(j == start ? '|' : ' ');
buffer->Printf("%02x", static_cast<uint8_t>(buffer_[j] % kMaxUint8));
buffer->AddChar(j == start ? '|' : ' ');
}
buffer->AddChar('\n');
}
}
void ReadStream::PrintWindow(intptr_t start, intptr_t window_size) {
TextBuffer buffer(1024);
WriteWindow(&buffer, start, window_size);
OS::Print("%s", buffer.buffer());
}
void BaseWriteStream::WriteTargetWord(word value) {
ASSERT(compiler::target::kBitsPerWord == kBitsPerWord ||
Utils::IsAbsoluteUint(compiler::target::kBitsPerWord, value));

173
runtime/vm/datastream.h
View file

@ -15,7 +15,14 @@
namespace dart {
class BaseTextBuffer;
static const int8_t kDataBitsPerByte = 7;
static const int8_t kByteMask = (1 << kDataBitsPerByte) - 1;
static const int8_t kMaxUnsignedDataPerByte = kByteMask;
static const int8_t kMinDataPerByte = -(1 << (kDataBitsPerByte - 1));
static const int8_t kMaxDataPerByte = (~kMinDataPerByte & kByteMask); // NOLINT
static const uint8_t kEndByteMarker = (255 - kMaxDataPerByte);
static const uint8_t kEndUnsignedByteMarker = (255 - kMaxUnsignedDataPerByte);
struct LEB128Constants : AllStatic {
// Convenience template for ensuring non-signed types trigger SFINAE.
template <typename T, typename S>
@ -28,13 +35,12 @@ struct LEB128Constants : AllStatic {
typename std::enable_if<std::is_unsigned<T>::value, S>::type;
// (S)LEB128 encodes 7 bits of data per byte (hence 128).
static constexpr size_t kDataBitsPerByte = 7;
static constexpr auto kDataByteMask =
Utils::NBitMask<uint8_t>(kDataBitsPerByte);
static constexpr uint8_t kDataBitsPerByte = 7;
static constexpr uint8_t kDataByteMask = (1 << kDataBitsPerByte) - 1;
// If more data follows a given data byte, the high bit is set.
static constexpr auto kMoreDataMask = Utils::Bit<uint8_t>(kDataBitsPerByte);
static constexpr uint8_t kMoreDataMask = (1 << kDataBitsPerByte);
// For SLEB128, the high bit in the data of the last byte is the sign bit.
static constexpr auto kSignMask = Utils::Bit<uint8_t>(kDataBitsPerByte - 1);
static constexpr uint8_t kSignMask = (1 << (kDataBitsPerByte - 1));
};
class NonStreamingWriteStream;
@ -87,6 +93,11 @@ class ReadStream : public ValueObject {
current_ += len;
}
template <typename T = intptr_t>
T ReadUnsigned() {
return Read<T>(kEndUnsignedByteMarker);
}
intptr_t Position() const { return current_ - buffer_; }
void SetPosition(intptr_t value) {
ASSERT((end_ - buffer_) >= value);
@ -111,6 +122,11 @@ class ReadStream : public ValueObject {
return (end_ - current_);
}
template <typename T>
T Read() {
return Read<T>(kEndByteMarker);
}
uword ReadWordWith32BitReads() {
constexpr intptr_t kNumRead32PerWord = kBitsPerWord / kBitsPerInt32;
@ -127,7 +143,7 @@ class ReadStream : public ValueObject {
public:
template <typename T = uintptr_t>
C::only_if_unsigned<T, T> ReadUnsigned() {
C::only_if_unsigned<T, T> ReadLEB128() {
constexpr intptr_t kBitsPerT = kBitsPerByte * sizeof(T);
T r = 0;
uint8_t s = 0;
@ -143,12 +159,12 @@ class ReadStream : public ValueObject {
}
template <typename T>
C::only_if_signed<T, T> ReadUnsigned() {
return bit_cast<T>(ReadUnsigned<typename std::make_unsigned<T>::type>());
C::only_if_signed<T, T> ReadLEB128() {
return bit_cast<T>(ReadLEB128<typename std::make_unsigned<T>::type>());
}
template <typename T>
C::only_if_unsigned<T, T> Read() {
C::only_if_unsigned<T, T> ReadSLEB128() {
constexpr intptr_t kBitsPerT = kBitsPerByte * sizeof(T);
T r = 0;
uint8_t s = 0;
@ -164,33 +180,114 @@ class ReadStream : public ValueObject {
// value. If the value is negative and the count of data bits is less than
// the size of the value, then we need to extend the sign by setting the
// remaining (unset) most significant bits (MSBs).
T sign_bits = 0;
if ((b & C::kSignMask) != 0 && s < kBitsPerT) {
// Create a bitmask for the current data bits and invert it.
r |= ~Utils::NBitMask<T>(s);
sign_bits = ~((static_cast<T>(1) << s) - 1);
}
return r;
return r | sign_bits;
}
template <typename T = intptr_t>
C::only_if_signed<T, T> Read() {
return bit_cast<T>(Read<typename std::make_unsigned<T>::type>());
C::only_if_signed<T, T> ReadSLEB128() {
return bit_cast<T>(ReadSLEB128<typename std::make_unsigned<T>::type>());
}
private:
uint16_t Read16();
uint32_t Read32();
uint64_t Read64();
uint16_t Read16() { return Read16(kEndByteMarker); }
uint32_t Read32() { return Read32(kEndByteMarker); }
uint64_t Read64() { return Read64(kEndByteMarker); }
template <typename T>
T Read(uint8_t end_byte_marker) {
using Unsigned = typename std::make_unsigned<T>::type;
Unsigned b = ReadByte();
if (b > kMaxUnsignedDataPerByte) {
return b - end_byte_marker;
}
T r = 0;
uint8_t s = 0;
do {
r |= static_cast<Unsigned>(b) << s;
s += kDataBitsPerByte;
b = ReadByte();
} while (b <= kMaxUnsignedDataPerByte);
return r | (static_cast<Unsigned>(b - end_byte_marker) << s);
}
// Setting up needed variables for the unrolled loop sections below.
#define UNROLLED_INIT() \
using Unsigned = typename std::make_unsigned<T>::type; \
Unsigned b = ReadByte(); \
if (b > kMaxUnsignedDataPerByte) { \
return b - end_byte_marker; \
} \
T r = b;
// Part of the unrolled loop where the loop may stop, having read the last part,
// or continue reading.
#define UNROLLED_BODY(bit_start) \
static_assert(bit_start % kDataBitsPerByte == 0, \
"Bit start must be a multiple of the data bits per byte"); \
static_assert(bit_start >= 0 && bit_start < kBitsPerByte * sizeof(T), \
"Starting unrolled body at invalid bit position"); \
static_assert(bit_start + kDataBitsPerByte < kBitsPerByte * sizeof(T), \
"Unrolled body should not contain final bits in value"); \
b = ReadByte(); \
if (b > kMaxUnsignedDataPerByte) { \
return r | (static_cast<T>(b - end_byte_marker) << bit_start); \
} \
r |= b << bit_start;
// The end of the unrolled loop.
#define UNROLLED_END(bit_start) \
static_assert(bit_start % kDataBitsPerByte == 0, \
"Bit start must be a multiple of the data bits per byte"); \
static_assert(bit_start >= 0 && bit_start < kBitsPerByte * sizeof(T), \
"Starting unrolled end at invalid bit position"); \
static_assert(bit_start + kDataBitsPerByte >= kBitsPerByte * sizeof(T), \
"Unrolled end does not contain final bits in value"); \
b = ReadByte(); \
ASSERT(b > kMaxUnsignedDataPerByte); \
return r | (static_cast<T>(b - end_byte_marker) << bit_start);
uint16_t Read16(uint8_t end_byte_marker) {
using T = uint16_t;
UNROLLED_INIT();
UNROLLED_BODY(7);
UNROLLED_END(14);
}
uint32_t Read32(uint8_t end_byte_marker) {
using T = uint32_t;
UNROLLED_INIT();
UNROLLED_BODY(7);
UNROLLED_BODY(14);
UNROLLED_BODY(21);
UNROLLED_END(28);
}
uint64_t Read64(uint8_t end_byte_marker) {
using T = uint64_t;
UNROLLED_INIT();
UNROLLED_BODY(7);
UNROLLED_BODY(14);
UNROLLED_BODY(21);
UNROLLED_BODY(28);
UNROLLED_BODY(35);
UNROLLED_BODY(42);
UNROLLED_BODY(49);
UNROLLED_BODY(56);
UNROLLED_END(63);
}
DART_FORCE_INLINE uint8_t ReadByte() {
ASSERT(current_ < end_);
return *current_++;
}
void WriteWindow(BaseTextBuffer* buffer,
intptr_t start,
intptr_t window_size = 64);
void PrintWindow(intptr_t start, intptr_t window_size = 64);
private:
const uint8_t* buffer_;
const uint8_t* current_;
@ -267,6 +364,16 @@ class BaseWriteStream : public ValueObject {
}
}
template <typename T>
void WriteUnsigned(T value) {
ASSERT(value >= 0);
while (value > kMaxUnsignedDataPerByte) {
WriteByte(static_cast<uint8_t>(value & kByteMask));
value = value >> kDataBitsPerByte;
}
WriteByte(static_cast<uint8_t>(value + kEndUnsignedByteMarker));
}
void WriteBytes(const void* addr, intptr_t len) {
if (len != 0) {
EnsureSpace(len);
@ -305,6 +412,16 @@ class BaseWriteStream : public ValueObject {
current_ += len; // Not len + 1 to swallow the terminating NUL.
}
template <typename T>
void Write(T value) {
T v = value;
while (v < kMinDataPerByte || v > kMaxDataPerByte) {
WriteByte(static_cast<uint8_t>(v & kByteMask));
v = v >> kDataBitsPerByte;
}
WriteByte(static_cast<uint8_t>(v + kEndByteMarker));
}
template <typename T>
void WriteFixed(T value) {
WriteBytes(&value, sizeof(value));
@ -322,7 +439,7 @@ class BaseWriteStream : public ValueObject {
public:
template <typename T>
C::only_if_unsigned<T, void> WriteUnsigned(T value) {
C::only_if_unsigned<T, void> WriteLEB128(T value) {
T remainder = value;
bool is_last_part;
do {
@ -339,15 +456,15 @@ class BaseWriteStream : public ValueObject {
}
template <typename T>
C::only_if_signed<T, void> WriteUnsigned(T value) {
C::only_if_signed<T, void> WriteLEB128(T value) {
// If we're trying to LEB128 encode a negative value, chances are we should
// be using SLEB128 instead.
ASSERT(value >= 0);
return WriteUnsigned(bit_cast<typename std::make_unsigned<T>::type>(value));
return WriteLEB128(bit_cast<typename std::make_unsigned<T>::type>(value));
}
template <typename T>
C::only_if_signed<T, void> Write(T value) {
C::only_if_signed<T, void> WriteSLEB128(T value) {
constexpr intptr_t kBitsPerT = kBitsPerByte * sizeof(T);
using Unsigned = typename std::make_unsigned<T>::type;
// Record whether the original value was negative.
@ -392,8 +509,8 @@ class BaseWriteStream : public ValueObject {
}
template <typename T>
C::only_if_unsigned<T, void> Write(T value) {
return Write(bit_cast<typename std::make_signed<T>::type>(value));
C::only_if_unsigned<T, void> WriteSLEB128(T value) {
return WriteSLEB128(bit_cast<typename std::make_signed<T>::type>(value));
}
protected:

56
runtime/vm/datastream_test.cc
View file

@ -126,4 +126,60 @@ TEST_CASE(ReadStream_Read64) {
TestRaw<int64_t>();
}
TEST_CASE(BaseWriteStream_WriteLEB128) {
MallocWriteStream writer(1 * KB);
for (uintptr_t i = 0; i < kUnsignedEnd; i++) {
writer.WriteLEB128(i);
}
DEFINE_LARGE_CONSTANTS(uintptr_t);
writer.WriteLEB128(all_ones);
writer.WriteLEB128(min);
writer.WriteLEB128(max);
writer.WriteLEB128(half_min);
writer.WriteLEB128(half_max);
ReadStream reader(writer.buffer(), writer.bytes_written());
for (uintptr_t i = 0; i < kUnsignedEnd; i++) {
const uintptr_t r = reader.ReadLEB128();
EXPECT_EQ(i, r);
}
const uintptr_t read_all_ones = reader.ReadLEB128();
EXPECT_EQ(all_ones, read_all_ones);
const uintptr_t read_min = reader.ReadLEB128();
EXPECT_EQ(min, read_min);
const uintptr_t read_max = reader.ReadLEB128();
EXPECT_EQ(max, read_max);
const uintptr_t read_half_min = reader.ReadLEB128();
EXPECT_EQ(half_min, read_half_min);
const uintptr_t read_half_max = reader.ReadLEB128();
EXPECT_EQ(half_max, read_half_max);
}
TEST_CASE(BaseWriteStream_WriteSLEB128) {
MallocWriteStream writer(1 * KB);
for (intptr_t i = kSignedStart; i < kSignedEnd; i++) {
writer.WriteSLEB128(i);
}
DEFINE_LARGE_CONSTANTS(intptr_t);
writer.WriteSLEB128(all_ones);
writer.WriteSLEB128(min);
writer.WriteSLEB128(max);
writer.WriteSLEB128(half_min);
writer.WriteSLEB128(half_max);
ReadStream reader(writer.buffer(), writer.bytes_written());
for (intptr_t i = kSignedStart; i < kSignedEnd; i++) {
const intptr_t r = reader.ReadSLEB128();
EXPECT_EQ(i, r);
}
const intptr_t read_all_ones = reader.ReadSLEB128();
EXPECT_EQ(all_ones, read_all_ones);
const intptr_t read_min = reader.ReadSLEB128();
EXPECT_EQ(min, read_min);
const intptr_t read_max = reader.ReadSLEB128();
EXPECT_EQ(max, read_max);
const intptr_t read_half_min = reader.ReadSLEB128();
EXPECT_EQ(half_min, read_half_min);
const intptr_t read_half_max = reader.ReadSLEB128();
EXPECT_EQ(half_max, read_half_max);
}
} // namespace dart

4
runtime/vm/elf.cc
View file

@ -1106,8 +1106,8 @@ class DwarfElfStream : public DwarfWriteStream {
stream_(ASSERT_NOTNULL(stream)),
table_(table) {}
void sleb128(intptr_t value) { stream_->Write(value); }
void uleb128(uintptr_t value) { stream_->WriteUnsigned(value); }
void sleb128(intptr_t value) { stream_->WriteSLEB128(value); }
void uleb128(uintptr_t value) { stream_->WriteLEB128(value); }
void u1(uint8_t value) { stream_->WriteByte(value); }
void u2(uint16_t value) { stream_->WriteFixed(value); }
void u4(uint32_t value) { stream_->WriteFixed(value); }

4
runtime/vm/kernel_binary.h
View file

@ -309,14 +309,14 @@ class Reader : public ValueObject {
intptr_t ReadSLEB128() {
ReadStream stream(this->buffer(), size_, offset_);
const intptr_t result = stream.Read();
const intptr_t result = stream.ReadSLEB128();
offset_ = stream.Position();
return result;
}
int64_t ReadSLEB128AsInt64() {
ReadStream stream(this->buffer(), size_, offset_);
const int64_t result = stream.Read<int64_t>();
const int64_t result = stream.ReadSLEB128<int64_t>();
offset_ = stream.Position();
return result;
}

12
runtime/vm/object.cc
View file

@ -14667,7 +14667,7 @@ bool CompressedStackMaps::Iterator::MoveNext() {
NoSafepointScope scope;
ReadStream stream(maps_.untag()->data(), maps_.payload_size(), next_offset_);
auto const pc_delta = stream.ReadUnsigned();
auto const pc_delta = stream.ReadLEB128();
ASSERT(pc_delta <= (kMaxUint32 - current_pc_offset_));
current_pc_offset_ += pc_delta;
@ -14675,7 +14675,7 @@ bool CompressedStackMaps::Iterator::MoveNext() {
// the post-delta part of inlined entries has the same information as
// global table entries.
if (maps_.UsesGlobalTable()) {
current_global_table_offset_ = stream.ReadUnsigned();
current_global_table_offset_ = stream.ReadLEB128();
ASSERT(current_global_table_offset_ < bits_container_.payload_size());
// Since generally we only use entries in the GC and the GC only needs
@ -14688,10 +14688,10 @@ bool CompressedStackMaps::Iterator::MoveNext() {
next_offset_ = stream.Position();
} else {
current_spill_slot_bit_count_ = stream.ReadUnsigned();
current_spill_slot_bit_count_ = stream.ReadLEB128();
ASSERT(current_spill_slot_bit_count_ >= 0);
current_non_spill_slot_bit_count_ = stream.ReadUnsigned();
current_non_spill_slot_bit_count_ = stream.ReadLEB128();
ASSERT(current_non_spill_slot_bit_count_ >= 0);
const auto stackmap_bits =
@ -14737,10 +14737,10 @@ void CompressedStackMaps::Iterator::LazyLoadGlobalTableEntry() const {
bits_container_.payload_size(),
current_global_table_offset_);
current_spill_slot_bit_count_ = stream.ReadUnsigned();
current_spill_slot_bit_count_ = stream.ReadLEB128();
ASSERT(current_spill_slot_bit_count_ >= 0);
current_non_spill_slot_bit_count_ = stream.ReadUnsigned();
current_non_spill_slot_bit_count_ = stream.ReadLEB128();
ASSERT(current_non_spill_slot_bit_count_ >= 0);
const auto stackmap_bits = Length();

10
runtime/vm/object.h
View file

@ -5641,7 +5641,7 @@ class PcDescriptors : public Object {
byte_index_);
// Moves to record that matches kind_mask_.
while (byte_index_ < descriptors_.Length()) {
const int32_t kind_and_metadata = stream.Read<int32_t>();
const int32_t kind_and_metadata = stream.ReadSLEB128<int32_t>();
cur_kind_ = UntaggedPcDescriptors::KindAndMetadata::DecodeKind(
kind_and_metadata);
cur_try_index_ = UntaggedPcDescriptors::KindAndMetadata::DecodeTryIndex(
@ -5650,12 +5650,12 @@ class PcDescriptors : public Object {
UntaggedPcDescriptors::KindAndMetadata::DecodeYieldIndex(
kind_and_metadata);
cur_pc_offset_ += stream.Read();
cur_pc_offset_ += stream.ReadSLEB128();
if (!FLAG_precompiled_mode) {
cur_deopt_id_ += stream.Read();
cur_token_pos_ =
Utils::AddWithWrapAround(cur_token_pos_, stream.Read<int32_t>());
cur_deopt_id_ += stream.ReadSLEB128();
cur_token_pos_ = Utils::AddWithWrapAround(
cur_token_pos_, stream.ReadSLEB128<int32_t>());
}
byte_index_ = stream.Position();

8
runtime/vm/program_visitor.cc
View file

@ -502,8 +502,8 @@ class StackMapEntry : public ZoneAllocated {
// initial offset of the entry in the array.
intptr_t EncodeTo(NonStreamingWriteStream* stream) {
auto const current_offset = stream->Position();
stream->WriteUnsigned(spill_slot_bit_count_);
stream->WriteUnsigned(non_spill_slot_bit_count_);
stream->WriteLEB128(spill_slot_bit_count_);
stream->WriteLEB128(non_spill_slot_bit_count_);
{
NoSafepointScope scope;
stream->WriteBytes(PayloadData(), PayloadLength());
@ -711,8 +711,8 @@ void ProgramVisitor::NormalizeAndDedupCompressedStackMaps(
StackMapEntry entry(zone_, it);
const intptr_t entry_offset = entry_offsets_.LookupValue(&entry);
const intptr_t pc_delta = it.pc_offset() - last_offset;
new_payload.WriteUnsigned(pc_delta);
new_payload.WriteUnsigned(entry_offset);
new_payload.WriteLEB128(pc_delta);
new_payload.WriteLEB128(entry_offset);
last_offset = it.pc_offset();
}
return CompressedStackMaps::NewUsingTable(new_payload.buffer(),

2
runtime/vm/v8_snapshot_writer.h
View file

@ -58,7 +58,7 @@ class V8SnapshotProfileWriter : public ZoneAllocated {
private:
static constexpr size_t kIdSpaceBits =
Utils::BitLength(static_cast<int64_t>(IdSpace::kArtificial));
static constexpr int64_t kIdSpaceMask = Utils::NBitMask(kIdSpaceBits);
static constexpr int64_t kIdSpaceMask = Utils::NBitMaskUnsafe(kIdSpaceBits);
static const char* IdSpaceToCString(IdSpace space);
int64_t encoded_;