mirror of
https://github.com/ClickHouse/ClickHouse.git
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344 lines
8.0 KiB
C++
344 lines
8.0 KiB
C++
// Copyright 2007 The RE2 Authors. All Rights Reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Compiled regular expression representation.
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// Tested by compile_test.cc
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#include "util/util.h"
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#include "util/sparse_set.h"
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#include "re2/prog.h"
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#include "re2/stringpiece.h"
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namespace re2 {
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// Constructors per Inst opcode
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void Prog::Inst::InitAlt(uint32 out, uint32 out1) {
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DCHECK_EQ(out_opcode_, 0);
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set_out_opcode(out, kInstAlt);
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out1_ = out1;
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}
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void Prog::Inst::InitByteRange(int lo, int hi, int foldcase, uint32 out) {
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DCHECK_EQ(out_opcode_, 0);
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set_out_opcode(out, kInstByteRange);
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lo_ = lo & 0xFF;
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hi_ = hi & 0xFF;
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foldcase_ = foldcase;
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}
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void Prog::Inst::InitCapture(int cap, uint32 out) {
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DCHECK_EQ(out_opcode_, 0);
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set_out_opcode(out, kInstCapture);
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cap_ = cap;
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}
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void Prog::Inst::InitEmptyWidth(EmptyOp empty, uint32 out) {
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DCHECK_EQ(out_opcode_, 0);
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set_out_opcode(out, kInstEmptyWidth);
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empty_ = empty;
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}
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void Prog::Inst::InitMatch(int32 id) {
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DCHECK_EQ(out_opcode_, 0);
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set_opcode(kInstMatch);
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match_id_ = id;
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}
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void Prog::Inst::InitNop(uint32 out) {
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DCHECK_EQ(out_opcode_, 0);
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set_opcode(kInstNop);
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}
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void Prog::Inst::InitFail() {
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DCHECK_EQ(out_opcode_, 0);
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set_opcode(kInstFail);
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}
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string Prog::Inst::Dump() {
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switch (opcode()) {
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default:
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return StringPrintf("opcode %d", static_cast<int>(opcode()));
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case kInstAlt:
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return StringPrintf("alt -> %d | %d", out(), out1_);
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case kInstAltMatch:
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return StringPrintf("altmatch -> %d | %d", out(), out1_);
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case kInstByteRange:
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return StringPrintf("byte%s [%02x-%02x] -> %d",
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foldcase_ ? "/i" : "",
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lo_, hi_, out());
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case kInstCapture:
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return StringPrintf("capture %d -> %d", cap_, out());
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case kInstEmptyWidth:
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return StringPrintf("emptywidth %#x -> %d",
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static_cast<int>(empty_), out());
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case kInstMatch:
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return StringPrintf("match! %d", match_id());
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case kInstNop:
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return StringPrintf("nop -> %d", out());
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case kInstFail:
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return StringPrintf("fail");
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}
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}
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Prog::Prog()
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: anchor_start_(false),
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anchor_end_(false),
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reversed_(false),
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did_onepass_(false),
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start_(0),
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start_unanchored_(0),
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size_(0),
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byte_inst_count_(0),
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bytemap_range_(0),
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flags_(0),
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onepass_statesize_(0),
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inst_(NULL),
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dfa_first_(NULL),
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dfa_longest_(NULL),
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dfa_mem_(0),
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delete_dfa_(NULL),
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unbytemap_(NULL),
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onepass_nodes_(NULL),
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onepass_start_(NULL) {
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}
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Prog::~Prog() {
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if (delete_dfa_) {
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if (dfa_first_)
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delete_dfa_(dfa_first_);
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if (dfa_longest_)
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delete_dfa_(dfa_longest_);
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}
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delete[] onepass_nodes_;
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delete[] inst_;
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delete[] unbytemap_;
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}
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typedef SparseSet Workq;
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static inline void AddToQueue(Workq* q, int id) {
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if (id != 0)
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q->insert(id);
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}
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static string ProgToString(Prog* prog, Workq* q) {
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string s;
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for (Workq::iterator i = q->begin(); i != q->end(); ++i) {
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int id = *i;
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Prog::Inst* ip = prog->inst(id);
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StringAppendF(&s, "%d. %s\n", id, ip->Dump().c_str());
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AddToQueue(q, ip->out());
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if (ip->opcode() == kInstAlt || ip->opcode() == kInstAltMatch)
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AddToQueue(q, ip->out1());
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}
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return s;
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}
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string Prog::Dump() {
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string map;
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if (false) { // Debugging
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int lo = 0;
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StringAppendF(&map, "byte map:\n");
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for (int i = 0; i < bytemap_range_; i++) {
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StringAppendF(&map, "\t%d. [%02x-%02x]\n", i, lo, unbytemap_[i]);
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lo = unbytemap_[i] + 1;
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}
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StringAppendF(&map, "\n");
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}
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Workq q(size_);
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AddToQueue(&q, start_);
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return map + ProgToString(this, &q);
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}
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string Prog::DumpUnanchored() {
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Workq q(size_);
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AddToQueue(&q, start_unanchored_);
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return ProgToString(this, &q);
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}
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static bool IsMatch(Prog*, Prog::Inst*);
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// Peep-hole optimizer.
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void Prog::Optimize() {
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Workq q(size_);
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// Eliminate nops. Most are taken out during compilation
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// but a few are hard to avoid.
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q.clear();
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AddToQueue(&q, start_);
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for (Workq::iterator i = q.begin(); i != q.end(); ++i) {
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int id = *i;
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Inst* ip = inst(id);
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int j = ip->out();
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Inst* jp;
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while (j != 0 && (jp=inst(j))->opcode() == kInstNop) {
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j = jp->out();
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}
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ip->set_out(j);
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AddToQueue(&q, ip->out());
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if (ip->opcode() == kInstAlt) {
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j = ip->out1();
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while (j != 0 && (jp=inst(j))->opcode() == kInstNop) {
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j = jp->out();
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}
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ip->out1_ = j;
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AddToQueue(&q, ip->out1());
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}
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}
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// Insert kInstAltMatch instructions
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// Look for
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// ip: Alt -> j | k
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// j: ByteRange [00-FF] -> ip
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// k: Match
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// or the reverse (the above is the greedy one).
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// Rewrite Alt to AltMatch.
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q.clear();
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AddToQueue(&q, start_);
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for (Workq::iterator i = q.begin(); i != q.end(); ++i) {
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int id = *i;
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Inst* ip = inst(id);
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AddToQueue(&q, ip->out());
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if (ip->opcode() == kInstAlt)
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AddToQueue(&q, ip->out1());
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if (ip->opcode() == kInstAlt) {
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Inst* j = inst(ip->out());
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Inst* k = inst(ip->out1());
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if (j->opcode() == kInstByteRange && j->out() == id &&
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j->lo() == 0x00 && j->hi() == 0xFF &&
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IsMatch(this, k)) {
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ip->set_opcode(kInstAltMatch);
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continue;
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}
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if (IsMatch(this, j) &&
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k->opcode() == kInstByteRange && k->out() == id &&
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k->lo() == 0x00 && k->hi() == 0xFF) {
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ip->set_opcode(kInstAltMatch);
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}
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}
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}
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}
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// Is ip a guaranteed match at end of text, perhaps after some capturing?
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static bool IsMatch(Prog* prog, Prog::Inst* ip) {
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for (;;) {
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switch (ip->opcode()) {
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default:
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LOG(DFATAL) << "Unexpected opcode in IsMatch: " << ip->opcode();
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return false;
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case kInstAlt:
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case kInstAltMatch:
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case kInstByteRange:
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case kInstFail:
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case kInstEmptyWidth:
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return false;
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case kInstCapture:
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case kInstNop:
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ip = prog->inst(ip->out());
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break;
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case kInstMatch:
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return true;
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}
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}
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}
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uint32 Prog::EmptyFlags(const StringPiece& text, const char* p) {
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int flags = 0;
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// ^ and \A
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if (p == text.begin())
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flags |= kEmptyBeginText | kEmptyBeginLine;
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else if (p[-1] == '\n')
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flags |= kEmptyBeginLine;
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// $ and \z
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if (p == text.end())
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flags |= kEmptyEndText | kEmptyEndLine;
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else if (p < text.end() && p[0] == '\n')
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flags |= kEmptyEndLine;
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// \b and \B
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if (p == text.begin() && p == text.end()) {
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// no word boundary here
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} else if (p == text.begin()) {
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if (IsWordChar(p[0]))
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flags |= kEmptyWordBoundary;
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} else if (p == text.end()) {
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if (IsWordChar(p[-1]))
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flags |= kEmptyWordBoundary;
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} else {
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if (IsWordChar(p[-1]) != IsWordChar(p[0]))
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flags |= kEmptyWordBoundary;
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}
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if (!(flags & kEmptyWordBoundary))
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flags |= kEmptyNonWordBoundary;
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return flags;
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}
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void Prog::MarkByteRange(int lo, int hi) {
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DCHECK_GE(lo, 0);
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DCHECK_GE(hi, 0);
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DCHECK_LE(lo, 255);
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DCHECK_LE(hi, 255);
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DCHECK_LE(lo, hi);
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if (0 < lo && lo <= 255)
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byterange_.Set(lo - 1);
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if (0 <= hi && hi <= 255)
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byterange_.Set(hi);
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}
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void Prog::ComputeByteMap() {
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// Fill in bytemap with byte classes for prog_.
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// Ranges of bytes that are treated as indistinguishable
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// by the regexp program are mapped to a single byte class.
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// The vector prog_->byterange() marks the end of each
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// such range.
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const Bitmap<256>& v = byterange();
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COMPILE_ASSERT(8*sizeof(v.Word(0)) == 32, wordsize);
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uint8 n = 0;
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uint32 bits = 0;
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for (int i = 0; i < 256; i++) {
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if ((i&31) == 0)
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bits = v.Word(i >> 5);
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bytemap_[i] = n;
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n += bits & 1;
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bits >>= 1;
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}
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bytemap_range_ = bytemap_[255] + 1;
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unbytemap_ = new uint8[bytemap_range_];
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for (int i = 0; i < 256; i++)
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unbytemap_[bytemap_[i]] = i;
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if (0) { // For debugging: use trivial byte map.
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for (int i = 0; i < 256; i++) {
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bytemap_[i] = i;
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unbytemap_[i] = i;
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}
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bytemap_range_ = 256;
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LOG(INFO) << "Using trivial bytemap.";
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}
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}
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} // namespace re2
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