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[regexp] Bytecode peephole optimization

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Bytecodes used by the regular expression interpreter often occur in
specific sequences. The number of dispatches in the interpreter can be
reduced if those sequences are combined into a single bytecode.

This CL adds a peephole optimization pass for regexp bytecodes.
This pass checks the generated bytecode for pre-defined sequences that
can be merged into a single bytecode.

With the currently implemented bytecode sequences a speedup of 1.12x on
regex-dna and octane-regexp is achieved.

Bug: v8:9330
Change-Id: I827f93273a5848e5963c7e3329daeb898995d151
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1813743
Commit-Queue: Patrick Thier <pthier@google.com>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63992}
This commit is contained in:
Patrick Thier 2019-09-26 15:53:53 +02:00 committed by Commit Bot
parent 4ce267a832
commit 6612943010
13 changed files with 2031 additions and 70 deletions
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3
BUILD.gn
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@ -2776,6 +2776,9 @@ v8_source_set("v8_base_without_compiler") {
"src/regexp/regexp-bytecode-generator-inl.h",
"src/regexp/regexp-bytecode-generator.cc",
"src/regexp/regexp-bytecode-generator.h",
"src/regexp/regexp-bytecode-peephole.cc",
"src/regexp/regexp-bytecode-peephole.h",
"src/regexp/regexp-bytecodes.cc",
"src/regexp/regexp-bytecodes.h",
"src/regexp/regexp-compiler-tonode.cc",
"src/regexp/regexp-compiler.cc",

14
src/flags/flag-definitions.h
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@ -1274,6 +1274,15 @@ DEFINE_BOOL(regexp_tier_up, true,
DEFINE_INT(regexp_tier_up_ticks, 1,
"set the number of executions for the regexp interpreter before "
"tiering-up to the compiler")
DEFINE_BOOL(regexp_peephole_optimization, true,
"enable peephole optimization for regexp bytecode")
DEFINE_BOOL(trace_regexp_peephole_optimization, false,
"trace regexp bytecode peephole optimization")
DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
DEFINE_BOOL(trace_regexp_assembler, false,
"trace regexp macro assembler calls.")
DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing")
DEFINE_BOOL(trace_regexp_tier_up, false, "trace regexp tiering up execution")
// Testing flags test/cctest/test-{flags,api,serialization}.cc
DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag")
@ -1408,11 +1417,6 @@ DEFINE_BOOL(trace_isolates, false, "trace isolate state changes")
// Regexp
DEFINE_BOOL(regexp_possessive_quantifier, false,
"enable possessive quantifier syntax for testing")
DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
DEFINE_BOOL(trace_regexp_assembler, false,
"trace regexp macro assembler calls.")
DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing")
DEFINE_BOOL(trace_regexp_tier_up, false, "trace regexp tiering up execution")
// Debugger
DEFINE_BOOL(print_break_location, false, "print source location on debug break")

22
src/regexp/regexp-bytecode-generator.cc
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@ -7,6 +7,7 @@
#include "src/ast/ast.h"
#include "src/objects/objects-inl.h"
#include "src/regexp/regexp-bytecode-generator-inl.h"
#include "src/regexp/regexp-bytecode-peephole.h"
#include "src/regexp/regexp-bytecodes.h"
#include "src/regexp/regexp-macro-assembler.h"
@ -18,6 +19,7 @@ RegExpBytecodeGenerator::RegExpBytecodeGenerator(Isolate* isolate, Zone* zone)
buffer_(Vector<byte>::New(1024)),
pc_(0),
advance_current_end_(kInvalidPC),
jump_edges_(zone),
isolate_(isolate) {}
RegExpBytecodeGenerator::~RegExpBytecodeGenerator() {
@ -39,6 +41,7 @@ void RegExpBytecodeGenerator::Bind(Label* l) {
int fixup = pos;
pos = *reinterpret_cast<int32_t*>(buffer_.begin() + fixup);
*reinterpret_cast<uint32_t*>(buffer_.begin() + fixup) = pc_;
jump_edges_.emplace(fixup, pc_);
}
}
l->bind_to(pc_);
@ -46,16 +49,17 @@ void RegExpBytecodeGenerator::Bind(Label* l) {
void RegExpBytecodeGenerator::EmitOrLink(Label* l) {
if (l == nullptr) l = &backtrack_;
int pos = 0;
if (l->is_bound()) {
Emit32(l->pos());
pos = l->pos();
jump_edges_.emplace(pc_, pos);
} else {
int pos = 0;
if (l->is_linked()) {
pos = l->pos();
}
l->link_to(pc_);
Emit32(pos);
}
Emit32(pos);
}
void RegExpBytecodeGenerator::PopRegister(int register_index) {
@ -365,8 +369,16 @@ void RegExpBytecodeGenerator::IfRegisterEqPos(int register_index,
Handle<HeapObject> RegExpBytecodeGenerator::GetCode(Handle<String> source) {
Bind(&backtrack_);
Emit(BC_POP_BT, 0);
Handle<ByteArray> array = isolate_->factory()->NewByteArray(length());
Copy(array->GetDataStartAddress());
Handle<ByteArray> array;
if (FLAG_regexp_peephole_optimization) {
array = RegExpBytecodePeepholeOptimization::OptimizeBytecode(
isolate_, zone(), source, buffer_.begin(), length(), jump_edges_);
} else {
array = isolate_->factory()->NewByteArray(length());
Copy(array->GetDataStartAddress());
}
return array;
}

6
src/regexp/regexp-bytecode-generator.h
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@ -100,6 +100,12 @@ class V8_EXPORT_PRIVATE RegExpBytecodeGenerator : public RegExpMacroAssembler {
int advance_current_offset_;
int advance_current_end_;
// Stores jump edges emitted for the bytecode (used by
// RegExpBytecodePeepholeOptimization).
// Key: jump source (offset in buffer_ where jump destination is stored).
// Value: jump destination (offset in buffer_ to jump to).
ZoneUnorderedMap<int, int> jump_edges_;
Isolate* isolate_;
static const int kInvalidPC = -1;

1021
src/regexp/regexp-bytecode-peephole.cc Normal file
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File diff suppressed because it is too large Load Diff

31
src/regexp/regexp-bytecode-peephole.h Normal file
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@ -0,0 +1,31 @@
// Copyright 2019 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.
#ifndef V8_REGEXP_REGEXP_BYTECODE_PEEPHOLE_H_
#define V8_REGEXP_REGEXP_BYTECODE_PEEPHOLE_H_
#include "src/common/globals.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
class ByteArray;
// Peephole optimization for regexp interpreter bytecode.
// Pre-defined bytecode sequences occuring in the bytecode generated by the
// RegExpBytecodeGenerator can be optimized into a single bytecode.
class RegExpBytecodePeepholeOptimization : public AllStatic {
public:
// Performs peephole optimization on the given bytecode and returns the
// optimized bytecode.
static Handle<ByteArray> OptimizeBytecode(
Isolate* isolate, Zone* zone, Handle<String> source, const byte* bytecode,
int length, const ZoneUnorderedMap<int, int>& jump_edges);
};
} // namespace internal
} // namespace v8
#endif // V8_REGEXP_REGEXP_BYTECODE_PEEPHOLE_H_

46
src/regexp/regexp-bytecodes.cc Normal file
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@ -0,0 +1,46 @@
// Copyright 2019 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/regexp/regexp-bytecodes.h"
#include <cctype>
#include "src/utils/utils.h"
namespace v8 {
namespace internal {
void RegExpBytecodeDisassembleSingle(const byte* code_base, const byte* pc) {
PrintF("%s", RegExpBytecodeName(*pc));
// Args and the bytecode as hex.
for (int i = 0; i < RegExpBytecodeLength(*pc); i++) {
PrintF(", %02x", pc[i]);
}
PrintF(" ");
// Args as ascii.
for (int i = 1; i < RegExpBytecodeLength(*pc); i++) {
unsigned char b = pc[i];
PrintF("%c", std::isprint(b) ? b : '.');
}
PrintF("\n");
}
void RegExpBytecodeDisassemble(const byte* code_base, int length,
const char* pattern) {
PrintF("[generated bytecode for regexp pattern: '%s']\n", pattern);
ptrdiff_t offset = 0;
while (offset < length) {
const byte* const pc = code_base + offset;
PrintF("%p %4" V8PRIxPTRDIFF " ", pc, offset);
RegExpBytecodeDisassembleSingle(code_base, pc);
offset += RegExpBytecodeLength(*pc);
}
}
} // namespace internal
} // namespace v8

146
src/regexp/regexp-bytecodes.h
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@ -6,6 +6,7 @@
#define V8_REGEXP_REGEXP_BYTECODES_H_
#include "src/base/macros.h"
#include "src/common/globals.h"
namespace v8 {
namespace internal {
@ -24,6 +25,8 @@ const unsigned int MAX_FIRST_ARG = 0x7fffffu;
const int BYTECODE_SHIFT = 8;
STATIC_ASSERT(1 << BYTECODE_SHIFT > BYTECODE_MASK);
// TODO(pthier): Argument offsets of bytecodes should be easily accessible by
// name or at least by position.
#define BYTECODE_ITERATOR(V) \
V(BREAK, 0, 4) /* bc8 */ \
V(PUSH_CP, 1, 4) /* bc8 pad24 */ \
@ -41,25 +44,61 @@ STATIC_ASSERT(1 << BYTECODE_SHIFT > BYTECODE_MASK);
V(FAIL, 13, 4) /* bc8 pad24 */ \
V(SUCCEED, 14, 4) /* bc8 pad24 */ \
V(ADVANCE_CP, 15, 4) /* bc8 offset24 */ \
V(GOTO, 16, 8) /* bc8 pad24 addr32 */ \
/* Jump to another bytecode given its offset. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x10 (fixed) Bytecode */ \
/* 0x08 - 0x1F: 0x00 (unused) Padding */ \
/* 0x20 - 0x3F: Address of bytecode to jump to */ \
V(GOTO, 16, 8) /* bc8 pad24 addr32 */ \
/* Check if offset is in range and load character at given offset. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x11 (fixed) Bytecode */ \
/* 0x08 - 0x1F: Offset from current position */ \
/* 0x20 - 0x3F: Address of bytecode when load is out of range */ \
V(LOAD_CURRENT_CHAR, 17, 8) /* bc8 offset24 addr32 */ \
/* Load character at given offset without range checks. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x12 (fixed) Bytecode */ \
/* 0x08 - 0x1F: Offset from current position */ \
V(LOAD_CURRENT_CHAR_UNCHECKED, 18, 4) /* bc8 offset24 */ \
V(LOAD_2_CURRENT_CHARS, 19, 8) /* bc8 offset24 addr32 */ \
V(LOAD_2_CURRENT_CHARS_UNCHECKED, 20, 4) /* bc8 offset24 */ \
V(LOAD_4_CURRENT_CHARS, 21, 8) /* bc8 offset24 addr32 */ \
V(LOAD_4_CURRENT_CHARS_UNCHECKED, 22, 4) /* bc8 offset24 */ \
V(CHECK_4_CHARS, 23, 12) /* bc8 pad24 uint32 addr32 */ \
V(CHECK_CHAR, 24, 8) /* bc8 pad8 uint16 addr32 */ \
/* Check if current character is equal to a given character */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x19 (fixed) Bytecode */ \
/* 0x08 - 0x0F: 0x00 (unused) Padding */ \
/* 0x10 - 0x1F: Character to check */ \
/* 0x20 - 0x3F: Address of bytecode when matched */ \
V(CHECK_CHAR, 24, 8) /* bc8 pad8 uint16 addr32 */ \
V(CHECK_NOT_4_CHARS, 25, 12) /* bc8 pad24 uint32 addr32 */ \
V(CHECK_NOT_CHAR, 26, 8) /* bc8 pad8 uint16 addr32 */ \
V(AND_CHECK_4_CHARS, 27, 16) /* bc8 pad24 uint32 uint32 addr32 */ \
V(AND_CHECK_CHAR, 28, 12) /* bc8 pad8 uint16 uint32 addr32 */ \
/* Checks if the current character combined with mask (bitwise and) */ \
/* matches a character (e.g. used when two characters in a disjunction */ \
/* differ by only a single bit */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x1c (fixed) Bytecode */ \
/* 0x08 - 0x0F: 0x00 (unused) Padding */ \
/* 0x10 - 0x1F: Character to match against (after mask aplied) */ \
/* 0x20 - 0x3F: Bitmask bitwise and combined with current character */ \
/* 0x40 - 0x5F: Address of bytecode when matched */ \
V(AND_CHECK_CHAR, 28, 12) /* bc8 pad8 uint16 uint32 addr32 */ \
V(AND_CHECK_NOT_4_CHARS, 29, 16) /* bc8 pad24 uint32 uint32 addr32 */ \
V(AND_CHECK_NOT_CHAR, 30, 12) /* bc8 pad8 uint16 uint32 addr32 */ \
V(MINUS_AND_CHECK_NOT_CHAR, 31, 12) /* bc8 pad8 uc16 uc16 uc16 addr32 */ \
V(CHECK_CHAR_IN_RANGE, 32, 12) /* bc8 pad24 uc16 uc16 addr32 */ \
V(CHECK_CHAR_NOT_IN_RANGE, 33, 12) /* bc8 pad24 uc16 uc16 addr32 */ \
V(CHECK_BIT_IN_TABLE, 34, 24) /* bc8 pad24 addr32 bits128 */ \
/* Checks if the current character matches any of the characters encoded */ \
/* in a bit table. Similar to/inspired by boyer moore string search */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x22 (fixed) Bytecode */ \
/* 0x08 - 0x1F: 0x00 (unused) Padding */ \
/* 0x20 - 0x3F: Address of bytecode when bit is set */ \
/* 0x40 - 0xBF: Bit table */ \
V(CHECK_BIT_IN_TABLE, 34, 24) /* bc8 pad24 addr32 bits128 */ \
V(CHECK_LT, 35, 8) /* bc8 pad8 uc16 addr32 */ \
V(CHECK_GT, 36, 8) /* bc8 pad8 uc16 addr32 */ \
V(CHECK_NOT_BACK_REF, 37, 8) /* bc8 reg_idx24 addr32 */ \
@ -74,10 +113,99 @@ STATIC_ASSERT(1 << BYTECODE_SHIFT > BYTECODE_MASK);
V(CHECK_REGISTER_EQ_POS, 46, 8) /* bc8 reg_idx24 addr32 */ \
V(CHECK_AT_START, 47, 8) /* bc8 pad24 addr32 */ \
V(CHECK_NOT_AT_START, 48, 8) /* bc8 offset24 addr32 */ \
/* Checks if the current position matches top of backtrack stack */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x31 (fixed) Bytecode */ \
/* 0x08 - 0x1F: 0x00 (unused) Padding */ \
/* 0x20 - 0x3F: Address of bytecode when current matches tos */ \
V(CHECK_GREEDY, 49, 8) /* bc8 pad24 addr32 */ \
V(ADVANCE_CP_AND_GOTO, 50, 8) /* bc8 offset24 addr32 */ \
/* Advance character pointer by given offset and jump to another bytecode.*/ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x32 (fixed) Bytecode */ \
/* 0x08 - 0x1F: Number of characters to advance */ \
/* 0x20 - 0x3F: Address of bytecode to jump to */ \
V(ADVANCE_CP_AND_GOTO, 50, 8) /* bc8 offset24 addr32 */ \
V(SET_CURRENT_POSITION_FROM_END, 51, 4) /* bc8 idx24 */ \
V(CHECK_CURRENT_POSITION, 52, 8) /* bc8 idx24 addr32 */
/* Checks if current position + given offset is in range. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07: 0x34 (fixed) Bytecode */ \
/* 0x08 - 0x1F: Offset from current position */ \
/* 0x20 - 0x3F: Address of bytecode when position is out of range */ \
V(CHECK_CURRENT_POSITION, 52, 8) /* bc8 idx24 addr32 */ \
/* Combination of: */ \
/* LOAD_CURRENT_CHAR, CHECK_BIT_IN_TABLE and ADVANCE_CP_AND_GOTO */ \
/* Emitted by RegExpBytecodePeepholeOptimization. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07 0x35 (fixed) Bytecode */ \
/* 0x08 - 0x1F Load character offset from current position */ \
/* 0x20 - 0x3F Number of characters to advance */ \
/* 0x40 - 0xBF Bit Table */ \
/* 0xC0 - 0xDF Address of bytecode when character is matched */ \
/* 0xE0 - 0xFF Address of bytecode when no match */ \
V(SKIP_UNTIL_BIT_IN_TABLE, 53, 32) \
/* Combination of: */ \
/* CHECK_CURRENT_POSITION, LOAD_CURRENT_CHAR_UNCHECKED, AND_CHECK_CHAR */ \
/* and ADVANCE_CP_AND_GOTO */ \
/* Emitted by RegExpBytecodePeepholeOptimization. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07 0x36 (fixed) Bytecode */ \
/* 0x08 - 0x1F Load character offset from current position */ \
/* 0x20 - 0x2F Number of characters to advance */ \
/* 0x30 - 0x3F Character to match against (after mask applied) */ \
/* 0x40 - 0x5F: Bitmask bitwise and combined with current character */ \
/* 0x60 - 0x7F Minimum number of characters this pattern consumes */ \
/* 0x80 - 0x9F Address of bytecode when character is matched */ \
/* 0xA0 - 0xBF Address of bytecode when no match */ \
V(SKIP_UNTIL_CHAR_AND, 54, 24) \
/* Combination of: */ \
/* LOAD_CURRENT_CHAR, CHECK_CHAR and ADVANCE_CP_AND_GOTO */ \
/* Emitted by RegExpBytecodePeepholeOptimization. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07 0x37 (fixed) Bytecode */ \
/* 0x08 - 0x1F Load character offset from current position */ \
/* 0x20 - 0x2F Number of characters to advance */ \
/* 0x30 - 0x3F Character to match */ \
/* 0x40 - 0x5F Address of bytecode when character is matched */ \
/* 0x60 - 0x7F Address of bytecode when no match */ \
V(SKIP_UNTIL_CHAR, 55, 16) \
/* Combination of: */ \
/* CHECK_CURRENT_POSITION, LOAD_CURRENT_CHAR_UNCHECKED, CHECK_CHAR */ \
/* and ADVANCE_CP_AND_GOTO */ \
/* Emitted by RegExpBytecodePeepholeOptimization. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07 0x38 (fixed) Bytecode */ \
/* 0x08 - 0x1F Load character offset from current position */ \
/* 0x20 - 0x2F Number of characters to advance */ \
/* 0x30 - 0x3F Character to match */ \
/* 0x40 - 0x5F Minimum number of characters this pattern consumes */ \
/* 0x60 - 0x7F Address of bytecode when character is matched */ \
/* 0x80 - 0x9F Address of bytecode when no match */ \
V(SKIP_UNTIL_CHAR_POS_CHECKED, 56, 20) \
/* Combination of: */ \
/* LOAD_CURRENT_CHAR, CHECK_CHAR, CHECK_CHAR and ADVANCE_CP_AND_GOTO */ \
/* Emitted by RegExpBytecodePeepholeOptimization. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07 0x39 (fixed) Bytecode */ \
/* 0x08 - 0x1F Load character offset from current position */ \
/* 0x20 - 0x3F Number of characters to advance */ \
/* 0x40 - 0x4F Character to match */ \
/* 0x50 - 0x5F Other Character to match */ \
/* 0x60 - 0x7F Address of bytecode when either character is matched */ \
/* 0x80 - 0x9F Address of bytecode when no match */ \
V(SKIP_UNTIL_CHAR_OR_CHAR, 57, 20) \
/* Combination of: */ \
/* LOAD_CURRENT_CHAR, CHECK_GT, CHECK_BIT_IN_TABLE, GOTO and */ \
/* and ADVANCE_CP_AND_GOTO */ \
/* Emitted by RegExpBytecodePeepholeOptimization. */ \
/* Bit Layout: */ \
/* 0x00 - 0x07 0x3A (fixed) Bytecode */ \
/* 0x08 - 0x1F Load character offset from current position */ \
/* 0x20 - 0x2F Number of characters to advance */ \
/* 0x30 - 0x3F Character to check if it is less than current char */ \
/* 0x40 - 0xBF Bit Table */ \
/* 0xC0 - 0xDF Address of bytecode when character is matched */ \
/* 0xE0 - 0xFF Address of bytecode when no match */ \
V(SKIP_UNTIL_GT_OR_NOT_BIT_IN_TABLE, 58, 32)
#define COUNT(...) +1
static constexpr int kRegExpBytecodeCount = BYTECODE_ITERATOR(COUNT);
@ -87,7 +215,7 @@ static constexpr int kRegExpBytecodeCount = BYTECODE_ITERATOR(COUNT);
// contiguous, strictly increasing, and start at 0.
// TODO(jgruber): Do not explicitly assign values, instead generate them
// implicitly from the list order.
STATIC_ASSERT(kRegExpBytecodeCount == 53);
STATIC_ASSERT(kRegExpBytecodeCount == 59);
#define DECLARE_BYTECODES(name, code, length) \
static constexpr int BC_##name = code;
@ -114,6 +242,10 @@ inline const char* RegExpBytecodeName(int bytecode) {
return kRegExpBytecodeNames[bytecode];
}
void RegExpBytecodeDisassembleSingle(const byte* code_base, const byte* pc);
void RegExpBytecodeDisassemble(const byte* code_base, int length,
const char* pattern);
} // namespace internal
} // namespace v8

177
src/regexp/regexp-interpreter.cc
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@ -64,23 +64,6 @@ bool BackRefMatchesNoCase(Isolate* isolate, int from, int current, int len,
return true;
}
void DisassembleSingleBytecode(const byte* code_base, const byte* pc) {
PrintF("%s", RegExpBytecodeName(*pc));
// Args and the bytecode as hex.
for (int i = 0; i < RegExpBytecodeLength(*pc); i++) {
PrintF(", %02x", pc[i]);
}
PrintF(" ");
// Args as ascii.
for (int i = 1; i < RegExpBytecodeLength(*pc); i++) {
unsigned char b = pc[i];
PrintF("%c", std::isprint(b) ? b : '.');
}
PrintF("\n");
}
#ifdef DEBUG
void MaybeTraceInterpreter(const byte* code_base, const byte* pc,
int stack_depth, int current_position,
@ -95,7 +78,7 @@ void MaybeTraceInterpreter(const byte* code_base, const byte* pc,
PrintF(format, pc - code_base, stack_depth, current_position, current_char,
printable ? current_char : '.');
DisassembleSingleBytecode(code_base, pc);
RegExpBytecodeDisassembleSingle(code_base, pc);
}
}
#endif // DEBUG
@ -257,6 +240,13 @@ IrregexpInterpreter::Result HandleInterrupts(
return IrregexpInterpreter::SUCCESS;
}
bool CheckBitInTable(const uint32_t current_char, const byte* const table) {
int mask = RegExpMacroAssembler::kTableMask;
int b = table[(current_char & mask) >> kBitsPerByteLog2];
int bit = (current_char & (kBitsPerByte - 1));
return (b & (1 << bit)) != 0;
}
// If computed gotos are supported by the compiler, we can get addresses to
// labels directly in C/C++. Every bytecode handler has its own label and we
// store the addresses in a dispatch table indexed by bytecode. To execute the
@ -281,7 +271,7 @@ IrregexpInterpreter::Result HandleInterrupts(
#define DISPATCH() \
pc = next_pc; \
insn = next_insn; \
break
goto switch_dispatch_continuation
#endif // V8_USE_COMPUTED_GOTO
// ADVANCE/SET_PC_FROM_OFFSET are separated from DISPATCH, because ideally some
@ -331,19 +321,13 @@ IrregexpInterpreter::Result RawMatch(Isolate* isolate, ByteArray code_array,
// Fill dispatch table from last defined bytecode up to the next power of two
// with BREAK (invalid operation).
// TODO(pthier): Find a way to fill up automatically (at compile time)
// 53 real bytecodes -> 11 fillers
// 59 real bytecodes -> 5 fillers
#define BYTECODE_FILLER_ITERATOR(V) \
V(BREAK) /* 1 */ \
V(BREAK) /* 2 */ \
V(BREAK) /* 3 */ \
V(BREAK) /* 4 */ \
V(BREAK) /* 5 */ \
V(BREAK) /* 6 */ \
V(BREAK) /* 7 */ \
V(BREAK) /* 8 */ \
V(BREAK) /* 9 */ \
V(BREAK) /* 10 */ \
V(BREAK) /* 11 */
V(BREAK) /* 5 */
#define COUNT(...) +1
static constexpr int kRegExpBytecodeFillerCount =
@ -652,10 +636,7 @@ IrregexpInterpreter::Result RawMatch(Isolate* isolate, ByteArray code_array,
DISPATCH();
}
BYTECODE(CHECK_BIT_IN_TABLE) {
int mask = RegExpMacroAssembler::kTableMask;
byte b = pc[8 + ((current_char & mask) >> kBitsPerByteLog2)];
int bit = (current_char & (kBitsPerByte - 1));
if ((b & (1 << bit)) != 0) {
if (CheckBitInTable(current_char, pc + 8)) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 4));
} else {
ADVANCE(CHECK_BIT_IN_TABLE);
@ -834,6 +815,118 @@ IrregexpInterpreter::Result RawMatch(Isolate* isolate, ByteArray code_array,
}
DISPATCH();
}
BYTECODE(SKIP_UNTIL_CHAR) {
int load_offset = (insn >> BYTECODE_SHIFT);
uint32_t advance = Load16Aligned(pc + 4);
uint32_t c = Load16Aligned(pc + 6);
while (static_cast<uintptr_t>(current + load_offset) <
static_cast<uintptr_t>(subject.length())) {
current_char = subject[current + load_offset];
if (c == current_char) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 8));
DISPATCH();
}
current += advance;
}
SET_PC_FROM_OFFSET(Load32Aligned(pc + 12));
DISPATCH();
}
BYTECODE(SKIP_UNTIL_CHAR_AND) {
int load_offset = (insn >> BYTECODE_SHIFT);
uint16_t advance = Load16Aligned(pc + 4);
uint16_t c = Load16Aligned(pc + 6);
uint32_t mask = Load32Aligned(pc + 8);
int32_t maximum_offset = Load32Aligned(pc + 12);
while (static_cast<uintptr_t>(current + maximum_offset) <=
static_cast<uintptr_t>(subject.length())) {
current_char = subject[current + load_offset];
if (c == (current_char & mask)) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 16));
DISPATCH();
}
current += advance;
}
SET_PC_FROM_OFFSET(Load32Aligned(pc + 20));
DISPATCH();
}
BYTECODE(SKIP_UNTIL_CHAR_POS_CHECKED) {
int load_offset = (insn >> BYTECODE_SHIFT);
uint16_t advance = Load16Aligned(pc + 4);
uint16_t c = Load16Aligned(pc + 6);
int32_t maximum_offset = Load32Aligned(pc + 8);
while (static_cast<uintptr_t>(current + maximum_offset) <=
static_cast<uintptr_t>(subject.length())) {
current_char = subject[current + load_offset];
if (c == current_char) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 12));
DISPATCH();
}
current += advance;
}
SET_PC_FROM_OFFSET(Load32Aligned(pc + 16));
DISPATCH();
}
BYTECODE(SKIP_UNTIL_BIT_IN_TABLE) {
int load_offset = (insn >> BYTECODE_SHIFT);
uint32_t advance = Load16Aligned(pc + 4);
const byte* table = pc + 8;
while (static_cast<uintptr_t>(current + load_offset) <
static_cast<uintptr_t>(subject.length())) {
current_char = subject[current + load_offset];
if (CheckBitInTable(current_char, table)) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 24));
DISPATCH();
}
current += advance;
}
SET_PC_FROM_OFFSET(Load32Aligned(pc + 28));
DISPATCH();
}
BYTECODE(SKIP_UNTIL_GT_OR_NOT_BIT_IN_TABLE) {
int load_offset = (insn >> BYTECODE_SHIFT);
uint16_t advance = Load16Aligned(pc + 4);
uint16_t limit = Load16Aligned(pc + 6);
const byte* table = pc + 8;
while (static_cast<uintptr_t>(current + load_offset) <
static_cast<uintptr_t>(subject.length())) {
current_char = subject[current + load_offset];
if (current_char > limit) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 24));
DISPATCH();
}
if (!CheckBitInTable(current_char, table)) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 24));
DISPATCH();
}
current += advance;
}
SET_PC_FROM_OFFSET(Load32Aligned(pc + 28));
DISPATCH();
}
BYTECODE(SKIP_UNTIL_CHAR_OR_CHAR) {
int load_offset = (insn >> BYTECODE_SHIFT);
uint32_t advance = Load16Aligned(pc + 4);
uint16_t c = Load16Aligned(pc + 8);
uint16_t c2 = Load16Aligned(pc + 10);
while (static_cast<uintptr_t>(current + load_offset) <
static_cast<uintptr_t>(subject.length())) {
current_char = subject[current + load_offset];
// The two if-statements below are split up intentionally, as combining
// them seems to result in register allocation behaving quite
// differently and slowing down the resulting code.
if (c == current_char) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 12));
DISPATCH();
}
if (c2 == current_char) {
SET_PC_FROM_OFFSET(Load32Aligned(pc + 12));
DISPATCH();
}
current += advance;
}
SET_PC_FROM_OFFSET(Load32Aligned(pc + 16));
DISPATCH();
}
#if V8_USE_COMPUTED_GOTO
// Lint gets confused a lot if we just use !V8_USE_COMPUTED_GOTO or ifndef
// V8_USE_COMPUTED_GOTO here.
@ -841,6 +934,9 @@ IrregexpInterpreter::Result RawMatch(Isolate* isolate, ByteArray code_array,
default:
UNREACHABLE();
}
// Label we jump to in DISPATCH(). There must be no instructions between the
// end of the switch, this label and the end of the loop.
switch_dispatch_continuation : {}
#endif // V8_USE_COMPUTED_GOTO
}
}
@ -855,25 +951,6 @@ IrregexpInterpreter::Result RawMatch(Isolate* isolate, ByteArray code_array,
} // namespace
// static
void IrregexpInterpreter::Disassemble(ByteArray byte_array,
const std::string& pattern) {
DisallowHeapAllocation no_gc;
PrintF("[generated bytecode for regexp pattern: '%s']\n", pattern.c_str());
const byte* const code_base = byte_array.GetDataStartAddress();
const int byte_array_length = byte_array.length();
ptrdiff_t offset = 0;
while (offset < byte_array_length) {
const byte* const pc = code_base + offset;
PrintF("%p %4" V8PRIxPTRDIFF " ", pc, offset);
DisassembleSingleBytecode(code_base, pc);
offset += RegExpBytecodeLength(*pc);
}
}
// static
IrregexpInterpreter::Result IrregexpInterpreter::Match(
Isolate* isolate, JSRegExp regexp, String subject_string, int* registers,

2
src/regexp/regexp-interpreter.h
View File

@ -46,8 +46,6 @@ class V8_EXPORT_PRIVATE IrregexpInterpreter : public AllStatic {
int registers_length, int start_position,
RegExp::CallOrigin call_origin);
static void Disassemble(ByteArray byte_array, const std::string& pattern);
private:
static Result Match(Isolate* isolate, JSRegExp regexp, String subject_string,
int* registers, int registers_length, int start_position,

4
src/regexp/regexp.cc
View File

@ -9,6 +9,7 @@
#include "src/heap/heap-inl.h"
#include "src/objects/js-regexp-inl.h"
#include "src/regexp/regexp-bytecode-generator.h"
#include "src/regexp/regexp-bytecodes.h"
#include "src/regexp/regexp-compiler.h"
#include "src/regexp/regexp-dotprinter.h"
#include "src/regexp/regexp-interpreter.h"
@ -867,7 +868,8 @@ bool RegExpImpl::Compile(Isolate* isolate, Zone* zone, RegExpCompileData* data,
data->compilation_target == RegExpCompilationTarget::kBytecode) {
Handle<ByteArray> bytecode(ByteArray::cast(result.code), isolate);
auto pattern_cstring = pattern->ToCString();
IrregexpInterpreter::Disassemble(*bytecode, pattern_cstring.get());
RegExpBytecodeDisassemble(bytecode->GetDataStartAddress(),
bytecode->length(), pattern_cstring.get());
}
}

562
test/cctest/test-regexp.cc
View File

@ -38,6 +38,7 @@
#include "src/objects/js-regexp-inl.h"
#include "src/objects/objects-inl.h"
#include "src/regexp/regexp-bytecode-generator.h"
#include "src/regexp/regexp-bytecodes.h"
#include "src/regexp/regexp-compiler.h"
#include "src/regexp/regexp-interpreter.h"
#include "src/regexp/regexp-macro-assembler-arch.h"
@ -1783,6 +1784,567 @@ TEST(UncachedExternalString) {
ExpectString("external.substring(1).match(re)[1]", "z");
}
// Test bytecode peephole optimization
void CreatePeepholeNoChangeBytecode(RegExpMacroAssembler* m) {
Label fail, backtrack;
m->PushBacktrack(&fail);
m->CheckNotAtStart(0, nullptr);
m->LoadCurrentCharacter(2, nullptr);
m->CheckNotCharacter('o', nullptr);
m->LoadCurrentCharacter(1, nullptr, false);
m->CheckNotCharacter('o', nullptr);
m->LoadCurrentCharacter(0, nullptr, false);
m->CheckNotCharacter('f', nullptr);
m->WriteCurrentPositionToRegister(0, 0);
m->WriteCurrentPositionToRegister(1, 3);
m->AdvanceCurrentPosition(3);
m->PushBacktrack(&backtrack);
m->Succeed();
m->Bind(&backtrack);
m->Backtrack();
m->Bind(&fail);
m->Fail();
}
TEST(PeepholeNoChange) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeNoChangeBytecode(&orig);
CreatePeepholeNoChangeBytecode(&opt);
Handle<String> source = factory->NewStringFromStaticChars("^foo");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
byte* byte_array = array->GetDataStartAddress();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
byte* byte_array_optimized = array_optimized->GetDataStartAddress();
CHECK_EQ(0, memcmp(byte_array, byte_array_optimized, length));
}
void CreatePeepholeSkipUntilCharBytecode(RegExpMacroAssembler* m) {
Label start;
m->Bind(&start);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckCharacter('x', nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&start);
}
TEST(PeepholeSkipUntilChar) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeSkipUntilCharBytecode(&orig);
CreatePeepholeSkipUntilCharBytecode(&opt);
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
int length_optimized = array_optimized->length();
int length_expected = RegExpBytecodeLength(BC_LOAD_CURRENT_CHAR) +
RegExpBytecodeLength(BC_CHECK_CHAR) +
RegExpBytecodeLength(BC_ADVANCE_CP_AND_GOTO) +
RegExpBytecodeLength(BC_POP_BT);
int length_optimized_expected = RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR) +
RegExpBytecodeLength(BC_POP_BT);
CHECK_EQ(length, length_expected);
CHECK_EQ(length_optimized, length_optimized_expected);
CHECK_EQ(BC_SKIP_UNTIL_CHAR, array_optimized->get(0));
CHECK_EQ(BC_POP_BT,
array_optimized->get(RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR)));
}
void CreatePeepholeSkipUntilBitInTableBytecode(RegExpMacroAssembler* m,
Factory* factory) {
Handle<ByteArray> bit_table = factory->NewByteArray(
RegExpMacroAssembler::kTableSize, AllocationType::kOld);
for (uint32_t i = 0; i < RegExpMacroAssembler::kTableSize; i++) {
bit_table->set(i, 0);
}
Label start;
m->Bind(&start);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckBitInTable(bit_table, nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&start);
}
TEST(PeepholeSkipUntilBitInTable) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeSkipUntilBitInTableBytecode(&orig, factory);
CreatePeepholeSkipUntilBitInTableBytecode(&opt, factory);
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
int length_optimized = array_optimized->length();
int length_expected = RegExpBytecodeLength(BC_LOAD_CURRENT_CHAR) +
RegExpBytecodeLength(BC_CHECK_BIT_IN_TABLE) +
RegExpBytecodeLength(BC_ADVANCE_CP_AND_GOTO) +
RegExpBytecodeLength(BC_POP_BT);
int length_optimized_expected =
RegExpBytecodeLength(BC_SKIP_UNTIL_BIT_IN_TABLE) +
RegExpBytecodeLength(BC_POP_BT);
CHECK_EQ(length, length_expected);
CHECK_EQ(length_optimized, length_optimized_expected);
CHECK_EQ(BC_SKIP_UNTIL_BIT_IN_TABLE, array_optimized->get(0));
CHECK_EQ(BC_POP_BT, array_optimized->get(
RegExpBytecodeLength(BC_SKIP_UNTIL_BIT_IN_TABLE)));
}
void CreatePeepholeSkipUntilCharPosCheckedBytecode(RegExpMacroAssembler* m) {
Label start;
m->Bind(&start);
m->LoadCurrentCharacter(0, nullptr, true, 1, 2);
m->CheckCharacter('x', nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&start);
}
TEST(PeepholeSkipUntilCharPosChecked) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeSkipUntilCharPosCheckedBytecode(&orig);
CreatePeepholeSkipUntilCharPosCheckedBytecode(&opt);
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
int length_optimized = array_optimized->length();
int length_expected = RegExpBytecodeLength(BC_CHECK_CURRENT_POSITION) +
RegExpBytecodeLength(BC_LOAD_CURRENT_CHAR_UNCHECKED) +
RegExpBytecodeLength(BC_CHECK_CHAR) +
RegExpBytecodeLength(BC_ADVANCE_CP_AND_GOTO) +
RegExpBytecodeLength(BC_POP_BT);
int length_optimized_expected =
RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR_POS_CHECKED) +
RegExpBytecodeLength(BC_POP_BT);
CHECK_EQ(length, length_expected);
CHECK_EQ(length_optimized, length_optimized_expected);
CHECK_EQ(BC_SKIP_UNTIL_CHAR_POS_CHECKED, array_optimized->get(0));
CHECK_EQ(BC_POP_BT, array_optimized->get(RegExpBytecodeLength(
BC_SKIP_UNTIL_CHAR_POS_CHECKED)));
}
void CreatePeepholeSkipUntilCharAndBytecode(RegExpMacroAssembler* m) {
Label start;
m->Bind(&start);
m->LoadCurrentCharacter(0, nullptr, true, 1, 2);
m->CheckCharacterAfterAnd('x', 0xFF, nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&start);
}
TEST(PeepholeSkipUntilCharAnd) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeSkipUntilCharAndBytecode(&orig);
CreatePeepholeSkipUntilCharAndBytecode(&opt);
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
int length_optimized = array_optimized->length();
int length_expected = RegExpBytecodeLength(BC_CHECK_CURRENT_POSITION) +
RegExpBytecodeLength(BC_LOAD_CURRENT_CHAR_UNCHECKED) +
RegExpBytecodeLength(BC_AND_CHECK_CHAR) +
RegExpBytecodeLength(BC_ADVANCE_CP_AND_GOTO) +
RegExpBytecodeLength(BC_POP_BT);
int length_optimized_expected = RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR_AND) +
RegExpBytecodeLength(BC_POP_BT);
CHECK_EQ(length, length_expected);
CHECK_EQ(length_optimized, length_optimized_expected);
CHECK_EQ(BC_SKIP_UNTIL_CHAR_AND, array_optimized->get(0));
CHECK_EQ(BC_POP_BT,
array_optimized->get(RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR_AND)));
}
void CreatePeepholeSkipUntilCharOrCharBytecode(RegExpMacroAssembler* m) {
Label start;
m->Bind(&start);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckCharacter('x', nullptr);
m->CheckCharacter('y', nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&start);
}
TEST(PeepholeSkipUntilCharOrChar) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeSkipUntilCharOrCharBytecode(&orig);
CreatePeepholeSkipUntilCharOrCharBytecode(&opt);
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
int length_optimized = array_optimized->length();
int length_expected = RegExpBytecodeLength(BC_LOAD_CURRENT_CHAR) +
RegExpBytecodeLength(BC_CHECK_CHAR) +
RegExpBytecodeLength(BC_CHECK_CHAR) +
RegExpBytecodeLength(BC_ADVANCE_CP_AND_GOTO) +
RegExpBytecodeLength(BC_POP_BT);
int length_optimized_expected =
RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR_OR_CHAR) +
RegExpBytecodeLength(BC_POP_BT);
CHECK_EQ(length, length_expected);
CHECK_EQ(length_optimized, length_optimized_expected);
CHECK_EQ(BC_SKIP_UNTIL_CHAR_OR_CHAR, array_optimized->get(0));
CHECK_EQ(BC_POP_BT, array_optimized->get(
RegExpBytecodeLength(BC_SKIP_UNTIL_CHAR_OR_CHAR)));
}
void CreatePeepholeSkipUntilGtOrNotBitInTableBytecode(RegExpMacroAssembler* m,
Factory* factory) {
Handle<ByteArray> bit_table = factory->NewByteArray(
RegExpMacroAssembler::kTableSize, AllocationType::kOld);
for (uint32_t i = 0; i < RegExpMacroAssembler::kTableSize; i++) {
bit_table->set(i, 0);
}
Label start, end, advance;
m->Bind(&start);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckCharacterGT('x', nullptr);
m->CheckBitInTable(bit_table, &advance);
m->GoTo(&end);
m->Bind(&advance);
m->AdvanceCurrentPosition(1);
m->GoTo(&start);
m->Bind(&end);
}
TEST(PeepholeSkipUntilGtOrNotBitInTable) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
CreatePeepholeSkipUntilGtOrNotBitInTableBytecode(&orig, factory);
CreatePeepholeSkipUntilGtOrNotBitInTableBytecode(&opt, factory);
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
int length = array->length();
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
int length_optimized = array_optimized->length();
int length_expected = RegExpBytecodeLength(BC_LOAD_CURRENT_CHAR) +
RegExpBytecodeLength(BC_CHECK_GT) +
RegExpBytecodeLength(BC_CHECK_BIT_IN_TABLE) +
RegExpBytecodeLength(BC_GOTO) +
RegExpBytecodeLength(BC_ADVANCE_CP_AND_GOTO) +
RegExpBytecodeLength(BC_POP_BT);
int length_optimized_expected =
RegExpBytecodeLength(BC_SKIP_UNTIL_GT_OR_NOT_BIT_IN_TABLE) +
RegExpBytecodeLength(BC_POP_BT);
CHECK_EQ(length, length_expected);
CHECK_EQ(length_optimized, length_optimized_expected);
CHECK_EQ(BC_SKIP_UNTIL_GT_OR_NOT_BIT_IN_TABLE, array_optimized->get(0));
CHECK_EQ(BC_POP_BT, array_optimized->get(RegExpBytecodeLength(
BC_SKIP_UNTIL_GT_OR_NOT_BIT_IN_TABLE)));
}
void CreatePeepholeLabelFixupsInsideBytecode(RegExpMacroAssembler* m,
Label* dummy_before,
Label* dummy_after,
Label* dummy_inside) {
Label loop;
m->Bind(dummy_before);
m->LoadCurrentCharacter(0, dummy_before);
m->CheckCharacter('a', dummy_after);
m->CheckCharacter('b', dummy_inside);
m->Bind(&loop);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckCharacter('x', nullptr);
m->Bind(dummy_inside);
m->CheckCharacter('y', nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&loop);
m->Bind(dummy_after);
m->LoadCurrentCharacter(0, dummy_before);
m->CheckCharacter('a', dummy_after);
m->CheckCharacter('b', dummy_inside);
}
TEST(PeepholeLabelFixupsInside) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
{
Label dummy_before, dummy_after, dummy_inside;
CreatePeepholeLabelFixupsInsideBytecode(&opt, &dummy_before, &dummy_after,
&dummy_inside);
}
Label dummy_before, dummy_after, dummy_inside;
CreatePeepholeLabelFixupsInsideBytecode(&orig, &dummy_before, &dummy_after,
&dummy_inside);
CHECK_EQ(0x00, dummy_before.pos());
CHECK_EQ(0x28, dummy_inside.pos());
CHECK_EQ(0x38, dummy_after.pos());
const Label* labels[] = {&dummy_before, &dummy_after, &dummy_inside};
const int label_positions[4][3] = {
{0x04, 0x3C}, // dummy_before
{0x0C, 0x44}, // dummy after
{0x14, 0x4C} // dummy inside
};
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
for (int label_idx = 0; label_idx < 3; label_idx++) {
for (int pos_idx = 0; pos_idx < 2; pos_idx++) {
CHECK_EQ(labels[label_idx]->pos(),
array->get(label_positions[label_idx][pos_idx]));
}
}
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
const int pos_fixups[] = {
0, // Position before optimization should be unchanged.
4, // Position after first replacement should be 4 (optimized size (20) -
// original size (32) + preserve length (16)).
};
const int target_fixups[] = {
0, // dummy_before should be unchanged
4, // dummy_inside should be 4
4 // dummy_after should be 4
};
for (int label_idx = 0; label_idx < 3; label_idx++) {
for (int pos_idx = 0; pos_idx < 2; pos_idx++) {
int label_pos = label_positions[label_idx][pos_idx] + pos_fixups[pos_idx];
int jump_address = *reinterpret_cast<uint32_t*>(
array_optimized->GetDataStartAddress() + label_pos);
int expected_jump_address =
labels[label_idx]->pos() + target_fixups[label_idx];
CHECK_EQ(expected_jump_address, jump_address);
}
}
}
void CreatePeepholeLabelFixupsComplexBytecode(RegExpMacroAssembler* m,
Label* dummy_before,
Label* dummy_between,
Label* dummy_after,
Label* dummy_inside) {
Label loop1, loop2;
m->Bind(dummy_before);
m->LoadCurrentCharacter(0, dummy_before);
m->CheckCharacter('a', dummy_between);
m->CheckCharacter('b', dummy_after);
m->CheckCharacter('c', dummy_inside);
m->Bind(&loop1);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckCharacter('x', nullptr);
m->CheckCharacter('y', nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&loop1);
m->Bind(dummy_between);
m->LoadCurrentCharacter(0, dummy_before);
m->CheckCharacter('a', dummy_between);
m->CheckCharacter('b', dummy_after);
m->CheckCharacter('c', dummy_inside);
m->Bind(&loop2);
m->LoadCurrentCharacter(0, nullptr, true);
m->CheckCharacter('x', nullptr);
m->Bind(dummy_inside);
m->CheckCharacter('y', nullptr);
m->AdvanceCurrentPosition(1);
m->GoTo(&loop2);
m->Bind(dummy_after);
m->LoadCurrentCharacter(0, dummy_before);
m->CheckCharacter('a', dummy_between);
m->CheckCharacter('b', dummy_after);
m->CheckCharacter('c', dummy_inside);
}
TEST(PeepholeLabelFixupsComplex) {
Zone zone(CcTest::i_isolate()->allocator(), ZONE_NAME);
Isolate* isolate = CcTest::i_isolate();
Factory* factory = isolate->factory();
HandleScope scope(isolate);
RegExpBytecodeGenerator orig(CcTest::i_isolate(), &zone);
RegExpBytecodeGenerator opt(CcTest::i_isolate(), &zone);
{
Label dummy_before, dummy_between, dummy_after, dummy_inside;
CreatePeepholeLabelFixupsComplexBytecode(
&opt, &dummy_before, &dummy_between, &dummy_after, &dummy_inside);
}
Label dummy_before, dummy_between, dummy_after, dummy_inside;
CreatePeepholeLabelFixupsComplexBytecode(&orig, &dummy_before, &dummy_between,
&dummy_after, &dummy_inside);
CHECK_EQ(0x00, dummy_before.pos());
CHECK_EQ(0x40, dummy_between.pos());
CHECK_EQ(0x70, dummy_inside.pos());
CHECK_EQ(0x80, dummy_after.pos());
const Label* labels[] = {&dummy_before, &dummy_between, &dummy_after,
&dummy_inside};
const int label_positions[4][3] = {
{0x04, 0x44, 0x84}, // dummy_before
{0x0C, 0x4C, 0x8C}, // dummy between
{0x14, 0x54, 0x94}, // dummy after
{0x1C, 0x5C, 0x9C} // dummy inside
};
Handle<String> source = factory->NewStringFromStaticChars("dummy");
i::FLAG_regexp_peephole_optimization = false;
Handle<ByteArray> array = Handle<ByteArray>::cast(orig.GetCode(source));
for (int label_idx = 0; label_idx < 4; label_idx++) {
for (int pos_idx = 0; pos_idx < 3; pos_idx++) {
CHECK_EQ(labels[label_idx]->pos(),
array->get(label_positions[label_idx][pos_idx]));
}
}
i::FLAG_regexp_peephole_optimization = true;
Handle<ByteArray> array_optimized =
Handle<ByteArray>::cast(opt.GetCode(source));
const int pos_fixups[] = {
0, // Position before optimization should be unchanged.
-12, // Position after first replacement should be -12 (optimized size =
// 20 - 32 = original size).
-8 // Position after second replacement should be -8 (-12 from first
// optimization -12 from second optimization + 16 preserved
// bytecodes).
};
const int target_fixups[] = {
0, // dummy_before should be unchanged
-12, // dummy_between should be -12
-8, // dummy_inside should be -8
-8 // dummy_after should be -8
};
for (int label_idx = 0; label_idx < 4; label_idx++) {
for (int pos_idx = 0; pos_idx < 3; pos_idx++) {
int label_pos = label_positions[label_idx][pos_idx] + pos_fixups[pos_idx];
int jump_address = *reinterpret_cast<uint32_t*>(
array_optimized->GetDataStartAddress() + label_pos);
int expected_jump_address =
labels[label_idx]->pos() + target_fixups[label_idx];
CHECK_EQ(expected_jump_address, jump_address);
}
}
}
#undef CHECK_PARSE_ERROR
#undef CHECK_SIMPLE
#undef CHECK_MIN_MAX

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tools/regexp-sequences.py Executable file
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#!/usr/bin/env python
# Copyright 2019 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.
"""
python %prog trace-file
Parses output generated by v8 with flag --trace-regexp-bytecodes and generates
a list of the most common sequences.
"""
from __future__ import print_function
import sys
import re
import collections
def parse(file, seqlen):
# example:
# pc = 00, sp = 0, curpos = 0, curchar = 0000000a ..., bc = PUSH_BT, 02, 00, 00, 00, e8, 00, 00, 00 .......
rx = re.compile(r'pc = (?P<pc>[0-9a-f]+), sp = (?P<sp>\d+), '
r'curpos = (?P<curpos>\d+), curchar = (?P<char_hex>[0-9a-f]+) '
r'(:?\.|\()(?P<char>\.|\w)(:?\.|\)), bc = (?P<bc>\w+), .*')
total = 0
bc_cnt = [None] * seqlen
for i in xrange(seqlen):
bc_cnt[i] = {}
last = [None] * seqlen
with open(file) as f:
l = f.readline()
while l:
l = l.strip()
if l.startswith("Start bytecode interpreter"):
for i in xrange(seqlen):
last[i] = collections.deque(maxlen=i+1)
match = rx.search(l)
if match:
total += 1
bc = match.group('bc')
for i in xrange(seqlen):
last[i].append(bc)
key = ' --> '.join(last[i])
bc_cnt[i][key] = bc_cnt[i].get(key,0) + 1
l = f.readline()
return bc_cnt, total
def print_most_common(d, seqlen, total):
sorted_d = sorted(d.items(), key=lambda kv: kv[1], reverse=True)
for (k,v) in sorted_d:
if v*100/total < 1.0:
return
print("{}: {} ({} %)".format(k,v,(v*100/total)))
def main(argv):
max_seq = 7
bc_cnt, total = parse(argv[1],max_seq)
for i in xrange(max_seq):
print()
print("Most common of length {}".format(i+1))
print()
print_most_common(bc_cnt[i], i, total)
if __name__ == '__main__':
main(sys.argv)