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![Stevie Strickland](/assets/img/avatar_default.png)
This work pulls in v8 support for these features with appropriate changes for Dart and closes https://github.com/dart-lang/sdk/issues/34935. This adds support for the following features: * Interpreting patterns as Unicode patterns instead of BMP patterns * the dotAll flag (`/s`) for changing the behavior of '.' to also match line terminators * Escapes for character classes described by Unicode property groups (e.g., \p{Greek} to match all Greek characters, or \P{Greek} for all non-Greek characters). The following TC39 proposals describe some of the added features: * https://github.com/tc39/proposal-regexp-dotall-flag * https://github.com/tc39/proposal-regexp-unicode-property-escapes These additional changes are included: * Extends named capture group names to include the full range of identifier characters supported by ECMAScript, not just ASCII. * Changing the RegExp interface to return RegExpMatch objects, not Match objects, so that downcasting is not necessary to use named capture groups from Dart **Note**: The changes to the RegExp interface are a breaking change for implementers of the RegExp interface. Current users of the RegExp interface (i.e., code using Dart RegExp objects) will not be affected. Change-Id: Ie62e6082a0e2fedc1680ef2576ce0c6db80fc19a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/100641 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Stevie Strickland <sstrickl@google.com>
1526 lines
57 KiB
C++
1526 lines
57 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_REGEXP_H_
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#define RUNTIME_VM_REGEXP_H_
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#include "platform/unicode.h"
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/compiler/backend/flow_graph_compiler.h"
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#include "vm/compiler/backend/il.h"
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#include "vm/object.h"
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#include "vm/regexp_assembler.h"
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#include "vm/splay-tree.h"
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namespace dart {
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class NodeVisitor;
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class RegExpCompiler;
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class RegExpMacroAssembler;
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class RegExpNode;
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class RegExpTree;
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class BoyerMooreLookahead;
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// Represents code units in the range from from_ to to_, both ends are
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// inclusive.
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class CharacterRange {
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public:
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CharacterRange() : from_(0), to_(0) {}
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CharacterRange(int32_t from, int32_t to) : from_(from), to_(to) {}
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static void AddClassEscape(uint16_t type,
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ZoneGrowableArray<CharacterRange>* ranges);
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// Add class escapes with case equivalent closure for \w and \W if necessary.
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static void AddClassEscape(uint16_t type,
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ZoneGrowableArray<CharacterRange>* ranges,
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bool add_unicode_case_equivalents);
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static GrowableArray<const intptr_t> GetWordBounds();
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static inline CharacterRange Singleton(int32_t value) {
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return CharacterRange(value, value);
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}
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static inline CharacterRange Range(int32_t from, int32_t to) {
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ASSERT(from <= to);
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return CharacterRange(from, to);
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}
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static inline CharacterRange Everything() {
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return CharacterRange(0, Utf::kMaxCodePoint);
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}
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static inline ZoneGrowableArray<CharacterRange>* List(Zone* zone,
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CharacterRange range) {
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auto list = new (zone) ZoneGrowableArray<CharacterRange>(1);
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list->Add(range);
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return list;
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}
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bool Contains(int32_t i) const { return from_ <= i && i <= to_; }
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int32_t from() const { return from_; }
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void set_from(int32_t value) { from_ = value; }
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int32_t to() const { return to_; }
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void set_to(int32_t value) { to_ = value; }
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bool is_valid() const { return from_ <= to_; }
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bool IsEverything(int32_t max) const { return from_ == 0 && to_ >= max; }
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bool IsSingleton() const { return (from_ == to_); }
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static void AddCaseEquivalents(ZoneGrowableArray<CharacterRange>* ranges,
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bool is_one_byte,
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Zone* zone);
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static void Split(ZoneGrowableArray<CharacterRange>* base,
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GrowableArray<const intptr_t> overlay,
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ZoneGrowableArray<CharacterRange>** included,
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ZoneGrowableArray<CharacterRange>** excluded,
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Zone* zone);
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// Whether a range list is in canonical form: Ranges ordered by from value,
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// and ranges non-overlapping and non-adjacent.
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static bool IsCanonical(ZoneGrowableArray<CharacterRange>* ranges);
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// Convert range list to canonical form. The characters covered by the ranges
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// will still be the same, but no character is in more than one range, and
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// adjacent ranges are merged. The resulting list may be shorter than the
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// original, but cannot be longer.
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static void Canonicalize(ZoneGrowableArray<CharacterRange>* ranges);
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// Negate the contents of a character range in canonical form.
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static void Negate(ZoneGrowableArray<CharacterRange>* src,
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ZoneGrowableArray<CharacterRange>* dst);
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static const intptr_t kStartMarker = (1 << 24);
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static const intptr_t kPayloadMask = (1 << 24) - 1;
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private:
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int32_t from_;
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int32_t to_;
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DISALLOW_ALLOCATION();
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};
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// A set of unsigned integers that behaves especially well on small
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// integers (< 32). May do zone-allocation.
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class OutSet : public ZoneAllocated {
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public:
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OutSet() : first_(0), remaining_(NULL), successors_(NULL) {}
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OutSet* Extend(unsigned value, Zone* zone);
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bool Get(unsigned value) const;
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static const unsigned kFirstLimit = 32;
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private:
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// Destructively set a value in this set. In most cases you want
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// to use Extend instead to ensure that only one instance exists
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// that contains the same values.
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void Set(unsigned value, Zone* zone);
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// The successors are a list of sets that contain the same values
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// as this set and the one more value that is not present in this
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// set.
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ZoneGrowableArray<OutSet*>* successors() { return successors_; }
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OutSet(uint32_t first, ZoneGrowableArray<unsigned>* remaining)
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: first_(first), remaining_(remaining), successors_(NULL) {}
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uint32_t first_;
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ZoneGrowableArray<unsigned>* remaining_;
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ZoneGrowableArray<OutSet*>* successors_;
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friend class Trace;
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};
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// A mapping from integers, specified as ranges, to a set of integers.
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// Used for mapping character ranges to choices.
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class DispatchTable : public ValueObject {
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public:
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explicit DispatchTable(Zone* zone) : tree_(zone) {}
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class Entry {
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public:
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Entry() : from_(0), to_(0), out_set_(nullptr) {}
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Entry(int32_t from, int32_t to, OutSet* out_set)
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: from_(from), to_(to), out_set_(out_set) {
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ASSERT(from <= to);
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}
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int32_t from() { return from_; }
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int32_t to() { return to_; }
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void set_to(int32_t value) { to_ = value; }
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void AddValue(int value, Zone* zone) {
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out_set_ = out_set_->Extend(value, zone);
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}
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OutSet* out_set() { return out_set_; }
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private:
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int32_t from_;
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int32_t to_;
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OutSet* out_set_;
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};
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class Config {
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public:
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typedef int32_t Key;
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typedef Entry Value;
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static const int32_t kNoKey;
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static const Entry NoValue() { return Value(); }
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static inline int Compare(int32_t a, int32_t b) {
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if (a == b)
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return 0;
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else if (a < b)
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return -1;
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else
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return 1;
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}
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};
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void AddRange(CharacterRange range, int32_t value, Zone* zone);
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OutSet* Get(int32_t value);
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void Dump();
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template <typename Callback>
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void ForEach(Callback* callback) {
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return tree()->ForEach(callback);
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}
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private:
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// There can't be a static empty set since it allocates its
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// successors in a zone and caches them.
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OutSet* empty() { return &empty_; }
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OutSet empty_;
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ZoneSplayTree<Config>* tree() { return &tree_; }
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ZoneSplayTree<Config> tree_;
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};
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// Categorizes character ranges into BMP, non-BMP, lead, and trail surrogates.
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class UnicodeRangeSplitter : public ValueObject {
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public:
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UnicodeRangeSplitter(Zone* zone, ZoneGrowableArray<CharacterRange>* base);
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void Call(uint32_t from, DispatchTable::Entry entry);
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ZoneGrowableArray<CharacterRange>* bmp() { return bmp_; }
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ZoneGrowableArray<CharacterRange>* lead_surrogates() {
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return lead_surrogates_;
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}
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ZoneGrowableArray<CharacterRange>* trail_surrogates() {
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return trail_surrogates_;
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}
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ZoneGrowableArray<CharacterRange>* non_bmp() const { return non_bmp_; }
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private:
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static const int kBase = 0;
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// Separate ranges into
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static const int kBmpCodePoints = 1;
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static const int kLeadSurrogates = 2;
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static const int kTrailSurrogates = 3;
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static const int kNonBmpCodePoints = 4;
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Zone* zone_;
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DispatchTable table_;
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ZoneGrowableArray<CharacterRange>* bmp_;
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ZoneGrowableArray<CharacterRange>* lead_surrogates_;
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ZoneGrowableArray<CharacterRange>* trail_surrogates_;
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ZoneGrowableArray<CharacterRange>* non_bmp_;
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};
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#define FOR_EACH_NODE_TYPE(VISIT) \
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VISIT(End) \
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VISIT(Action) \
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VISIT(Choice) \
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VISIT(BackReference) \
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VISIT(Assertion) \
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VISIT(Text)
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#define FOR_EACH_REG_EXP_TREE_TYPE(VISIT) \
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VISIT(Disjunction) \
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VISIT(Alternative) \
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VISIT(Assertion) \
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VISIT(CharacterClass) \
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VISIT(Atom) \
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VISIT(Quantifier) \
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VISIT(Capture) \
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VISIT(Lookaround) \
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VISIT(BackReference) \
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VISIT(Empty) \
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VISIT(Text)
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#define FORWARD_DECLARE(Name) class RegExp##Name;
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FOR_EACH_REG_EXP_TREE_TYPE(FORWARD_DECLARE)
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#undef FORWARD_DECLARE
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class TextElement {
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public:
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enum TextType { ATOM, CHAR_CLASS };
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static TextElement Atom(RegExpAtom* atom);
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static TextElement CharClass(RegExpCharacterClass* char_class);
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intptr_t cp_offset() const { return cp_offset_; }
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void set_cp_offset(intptr_t cp_offset) { cp_offset_ = cp_offset; }
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intptr_t length() const;
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TextType text_type() const { return text_type_; }
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RegExpTree* tree() const { return tree_; }
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RegExpAtom* atom() const {
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ASSERT(text_type() == ATOM);
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return reinterpret_cast<RegExpAtom*>(tree());
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}
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RegExpCharacterClass* char_class() const {
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ASSERT(text_type() == CHAR_CLASS);
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return reinterpret_cast<RegExpCharacterClass*>(tree());
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}
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private:
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TextElement(TextType text_type, RegExpTree* tree)
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: cp_offset_(-1), text_type_(text_type), tree_(tree) {}
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intptr_t cp_offset_;
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TextType text_type_;
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RegExpTree* tree_;
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DISALLOW_ALLOCATION();
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};
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class Trace;
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struct PreloadState;
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class GreedyLoopState;
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class AlternativeGenerationList;
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struct NodeInfo {
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NodeInfo()
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: being_analyzed(false),
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been_analyzed(false),
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follows_word_interest(false),
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follows_newline_interest(false),
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follows_start_interest(false),
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at_end(false),
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visited(false),
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replacement_calculated(false) {}
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// Returns true if the interests and assumptions of this node
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// matches the given one.
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bool Matches(NodeInfo* that) {
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return (at_end == that->at_end) &&
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(follows_word_interest == that->follows_word_interest) &&
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(follows_newline_interest == that->follows_newline_interest) &&
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(follows_start_interest == that->follows_start_interest);
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}
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// Updates the interests of this node given the interests of the
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// node preceding it.
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void AddFromPreceding(NodeInfo* that) {
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at_end |= that->at_end;
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follows_word_interest |= that->follows_word_interest;
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follows_newline_interest |= that->follows_newline_interest;
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follows_start_interest |= that->follows_start_interest;
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}
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bool HasLookbehind() {
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return follows_word_interest || follows_newline_interest ||
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follows_start_interest;
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}
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// Sets the interests of this node to include the interests of the
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// following node.
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void AddFromFollowing(NodeInfo* that) {
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follows_word_interest |= that->follows_word_interest;
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follows_newline_interest |= that->follows_newline_interest;
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follows_start_interest |= that->follows_start_interest;
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}
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void ResetCompilationState() {
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being_analyzed = false;
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been_analyzed = false;
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}
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bool being_analyzed : 1;
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bool been_analyzed : 1;
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// These bits are set of this node has to know what the preceding
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// character was.
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bool follows_word_interest : 1;
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bool follows_newline_interest : 1;
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bool follows_start_interest : 1;
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bool at_end : 1;
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bool visited : 1;
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bool replacement_calculated : 1;
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};
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// Details of a quick mask-compare check that can look ahead in the
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// input stream.
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class QuickCheckDetails {
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public:
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QuickCheckDetails()
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: characters_(0), mask_(0), value_(0), cannot_match_(false) {}
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explicit QuickCheckDetails(intptr_t characters)
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: characters_(characters), mask_(0), value_(0), cannot_match_(false) {}
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bool Rationalize(bool one_byte);
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// Merge in the information from another branch of an alternation.
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void Merge(QuickCheckDetails* other, intptr_t from_index);
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// Advance the current position by some amount.
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void Advance(intptr_t by, bool one_byte);
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void Clear();
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bool cannot_match() { return cannot_match_; }
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void set_cannot_match() { cannot_match_ = true; }
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struct Position {
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Position() : mask(0), value(0), determines_perfectly(false) {}
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uint16_t mask;
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uint16_t value;
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bool determines_perfectly;
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};
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intptr_t characters() { return characters_; }
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void set_characters(intptr_t characters) { characters_ = characters; }
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Position* positions(intptr_t index) {
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ASSERT(index >= 0);
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ASSERT(index < characters_);
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return positions_ + index;
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}
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uint32_t mask() { return mask_; }
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uint32_t value() { return value_; }
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private:
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// How many characters do we have quick check information from. This is
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// the same for all branches of a choice node.
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intptr_t characters_;
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Position positions_[4];
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// These values are the condensate of the above array after Rationalize().
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uint32_t mask_;
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uint32_t value_;
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// If set to true, there is no way this quick check can match at all.
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// E.g., if it requires to be at the start of the input, and isn't.
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bool cannot_match_;
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DISALLOW_ALLOCATION();
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};
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class RegExpNode : public ZoneAllocated {
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public:
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explicit RegExpNode(Zone* zone)
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: replacement_(NULL), trace_count_(0), zone_(zone) {
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bm_info_[0] = bm_info_[1] = NULL;
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}
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virtual ~RegExpNode();
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virtual void Accept(NodeVisitor* visitor) = 0;
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// Generates a goto to this node or actually generates the code at this point.
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virtual void Emit(RegExpCompiler* compiler, Trace* trace) = 0;
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// How many characters must this node consume at a minimum in order to
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// succeed. If we have found at least 'still_to_find' characters that
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// must be consumed there is no need to ask any following nodes whether
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// they are sure to eat any more characters. The not_at_start argument is
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// used to indicate that we know we are not at the start of the input. In
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// this case anchored branches will always fail and can be ignored when
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// determining how many characters are consumed on success.
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virtual intptr_t EatsAtLeast(intptr_t still_to_find,
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intptr_t budget,
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bool not_at_start) = 0;
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// Emits some quick code that checks whether the preloaded characters match.
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// Falls through on certain failure, jumps to the label on possible success.
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// If the node cannot make a quick check it does nothing and returns false.
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bool EmitQuickCheck(RegExpCompiler* compiler,
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Trace* bounds_check_trace,
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Trace* trace,
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bool preload_has_checked_bounds,
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BlockLabel* on_possible_success,
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QuickCheckDetails* details_return,
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bool fall_through_on_failure);
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// For a given number of characters this returns a mask and a value. The
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// next n characters are anded with the mask and compared with the value.
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// A comparison failure indicates the node cannot match the next n characters.
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// A comparison success indicates the node may match.
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virtual void GetQuickCheckDetails(QuickCheckDetails* details,
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RegExpCompiler* compiler,
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intptr_t characters_filled_in,
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bool not_at_start) = 0;
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static const intptr_t kNodeIsTooComplexForGreedyLoops = -1;
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virtual intptr_t GreedyLoopTextLength() {
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return kNodeIsTooComplexForGreedyLoops;
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}
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// Only returns the successor for a text node of length 1 that matches any
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// character and that has no guards on it.
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virtual RegExpNode* GetSuccessorOfOmnivorousTextNode(
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RegExpCompiler* compiler) {
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return NULL;
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}
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// Collects information on the possible code units (mod 128) that can match if
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// we look forward. This is used for a Boyer-Moore-like string searching
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// implementation. TODO(erikcorry): This should share more code with
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// EatsAtLeast, GetQuickCheckDetails. The budget argument is used to limit
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// the number of nodes we are willing to look at in order to create this data.
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static const intptr_t kRecursionBudget = 200;
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virtual void FillInBMInfo(intptr_t offset,
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intptr_t budget,
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BoyerMooreLookahead* bm,
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bool not_at_start) {
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UNREACHABLE();
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}
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// If we know that the input is one-byte then there are some nodes that can
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// never match. This method returns a node that can be substituted for
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// itself, or NULL if the node can never match.
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virtual RegExpNode* FilterOneByte(intptr_t depth) { return this; }
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// Helper for FilterOneByte.
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RegExpNode* replacement() {
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ASSERT(info()->replacement_calculated);
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return replacement_;
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}
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RegExpNode* set_replacement(RegExpNode* replacement) {
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info()->replacement_calculated = true;
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replacement_ = replacement;
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return replacement; // For convenience.
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}
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// We want to avoid recalculating the lookahead info, so we store it on the
|
|
// node. Only info that is for this node is stored. We can tell that the
|
|
// info is for this node when offset == 0, so the information is calculated
|
|
// relative to this node.
|
|
void SaveBMInfo(BoyerMooreLookahead* bm, bool not_at_start, intptr_t offset) {
|
|
if (offset == 0) set_bm_info(not_at_start, bm);
|
|
}
|
|
|
|
BlockLabel* label() { return &label_; }
|
|
// If non-generic code is generated for a node (i.e. the node is not at the
|
|
// start of the trace) then it cannot be reused. This variable sets a limit
|
|
// on how often we allow that to happen before we insist on starting a new
|
|
// trace and generating generic code for a node that can be reused by flushing
|
|
// the deferred actions in the current trace and generating a goto.
|
|
static const intptr_t kMaxCopiesCodeGenerated = 10;
|
|
|
|
NodeInfo* info() { return &info_; }
|
|
|
|
BoyerMooreLookahead* bm_info(bool not_at_start) {
|
|
return bm_info_[not_at_start ? 1 : 0];
|
|
}
|
|
|
|
Zone* zone() const { return zone_; }
|
|
|
|
protected:
|
|
enum LimitResult { DONE, CONTINUE };
|
|
RegExpNode* replacement_;
|
|
|
|
LimitResult LimitVersions(RegExpCompiler* compiler, Trace* trace);
|
|
|
|
void set_bm_info(bool not_at_start, BoyerMooreLookahead* bm) {
|
|
bm_info_[not_at_start ? 1 : 0] = bm;
|
|
}
|
|
|
|
private:
|
|
static const intptr_t kFirstCharBudget = 10;
|
|
BlockLabel label_;
|
|
NodeInfo info_;
|
|
// This variable keeps track of how many times code has been generated for
|
|
// this node (in different traces). We don't keep track of where the
|
|
// generated code is located unless the code is generated at the start of
|
|
// a trace, in which case it is generic and can be reused by flushing the
|
|
// deferred operations in the current trace and generating a goto.
|
|
intptr_t trace_count_;
|
|
BoyerMooreLookahead* bm_info_[2];
|
|
Zone* zone_;
|
|
};
|
|
|
|
// A simple closed interval.
|
|
class Interval {
|
|
public:
|
|
Interval() : from_(kNone), to_(kNone) {}
|
|
Interval(intptr_t from, intptr_t to) : from_(from), to_(to) {}
|
|
|
|
Interval Union(Interval that) {
|
|
if (that.from_ == kNone)
|
|
return *this;
|
|
else if (from_ == kNone)
|
|
return that;
|
|
else
|
|
return Interval(Utils::Minimum(from_, that.from_),
|
|
Utils::Maximum(to_, that.to_));
|
|
}
|
|
bool Contains(intptr_t value) const {
|
|
return (from_ <= value) && (value <= to_);
|
|
}
|
|
bool is_empty() const { return from_ == kNone; }
|
|
intptr_t from() const { return from_; }
|
|
intptr_t to() const { return to_; }
|
|
static Interval Empty() { return Interval(); }
|
|
static const intptr_t kNone = -1;
|
|
|
|
private:
|
|
intptr_t from_;
|
|
intptr_t to_;
|
|
|
|
DISALLOW_ALLOCATION();
|
|
};
|
|
|
|
class SeqRegExpNode : public RegExpNode {
|
|
public:
|
|
explicit SeqRegExpNode(RegExpNode* on_success)
|
|
: RegExpNode(on_success->zone()), on_success_(on_success) {}
|
|
RegExpNode* on_success() { return on_success_; }
|
|
void set_on_success(RegExpNode* node) { on_success_ = node; }
|
|
virtual RegExpNode* FilterOneByte(intptr_t depth);
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start) {
|
|
on_success_->FillInBMInfo(offset, budget - 1, bm, not_at_start);
|
|
if (offset == 0) set_bm_info(not_at_start, bm);
|
|
}
|
|
|
|
protected:
|
|
RegExpNode* FilterSuccessor(intptr_t depth);
|
|
|
|
private:
|
|
RegExpNode* on_success_;
|
|
};
|
|
|
|
class ActionNode : public SeqRegExpNode {
|
|
public:
|
|
enum ActionType {
|
|
SET_REGISTER,
|
|
INCREMENT_REGISTER,
|
|
STORE_POSITION,
|
|
BEGIN_SUBMATCH,
|
|
POSITIVE_SUBMATCH_SUCCESS,
|
|
EMPTY_MATCH_CHECK,
|
|
CLEAR_CAPTURES
|
|
};
|
|
static ActionNode* SetRegister(intptr_t reg,
|
|
intptr_t val,
|
|
RegExpNode* on_success);
|
|
static ActionNode* IncrementRegister(intptr_t reg, RegExpNode* on_success);
|
|
static ActionNode* StorePosition(intptr_t reg,
|
|
bool is_capture,
|
|
RegExpNode* on_success);
|
|
static ActionNode* ClearCaptures(Interval range, RegExpNode* on_success);
|
|
static ActionNode* BeginSubmatch(intptr_t stack_pointer_reg,
|
|
intptr_t position_reg,
|
|
RegExpNode* on_success);
|
|
static ActionNode* PositiveSubmatchSuccess(intptr_t stack_pointer_reg,
|
|
intptr_t restore_reg,
|
|
intptr_t clear_capture_count,
|
|
intptr_t clear_capture_from,
|
|
RegExpNode* on_success);
|
|
static ActionNode* EmptyMatchCheck(intptr_t start_register,
|
|
intptr_t repetition_register,
|
|
intptr_t repetition_limit,
|
|
RegExpNode* on_success);
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t filled_in,
|
|
bool not_at_start) {
|
|
return on_success()->GetQuickCheckDetails(details, compiler, filled_in,
|
|
not_at_start);
|
|
}
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start);
|
|
ActionType action_type() { return action_type_; }
|
|
// TODO(erikcorry): We should allow some action nodes in greedy loops.
|
|
virtual intptr_t GreedyLoopTextLength() {
|
|
return kNodeIsTooComplexForGreedyLoops;
|
|
}
|
|
|
|
private:
|
|
union {
|
|
struct {
|
|
intptr_t reg;
|
|
intptr_t value;
|
|
} u_store_register;
|
|
struct {
|
|
intptr_t reg;
|
|
} u_increment_register;
|
|
struct {
|
|
intptr_t reg;
|
|
bool is_capture;
|
|
} u_position_register;
|
|
struct {
|
|
intptr_t stack_pointer_register;
|
|
intptr_t current_position_register;
|
|
intptr_t clear_register_count;
|
|
intptr_t clear_register_from;
|
|
} u_submatch;
|
|
struct {
|
|
intptr_t start_register;
|
|
intptr_t repetition_register;
|
|
intptr_t repetition_limit;
|
|
} u_empty_match_check;
|
|
struct {
|
|
intptr_t range_from;
|
|
intptr_t range_to;
|
|
} u_clear_captures;
|
|
} data_;
|
|
ActionNode(ActionType action_type, RegExpNode* on_success)
|
|
: SeqRegExpNode(on_success), action_type_(action_type) {}
|
|
ActionType action_type_;
|
|
friend class DotPrinter;
|
|
};
|
|
|
|
class TextNode : public SeqRegExpNode {
|
|
public:
|
|
TextNode(ZoneGrowableArray<TextElement>* elms,
|
|
bool read_backward,
|
|
RegExpNode* on_success)
|
|
: SeqRegExpNode(on_success), elms_(elms), read_backward_(read_backward) {}
|
|
TextNode(RegExpCharacterClass* that,
|
|
bool read_backward,
|
|
RegExpNode* on_success)
|
|
: SeqRegExpNode(on_success),
|
|
elms_(new (zone()) ZoneGrowableArray<TextElement>(1)),
|
|
read_backward_(read_backward) {
|
|
elms_->Add(TextElement::CharClass(that));
|
|
}
|
|
// Create TextNode for a single character class for the given ranges.
|
|
static TextNode* CreateForCharacterRanges(
|
|
ZoneGrowableArray<CharacterRange>* ranges,
|
|
bool read_backward,
|
|
RegExpNode* on_success,
|
|
RegExpFlags flags);
|
|
// Create TextNode for a surrogate pair with a range given for the
|
|
// lead and the trail surrogate each.
|
|
static TextNode* CreateForSurrogatePair(CharacterRange lead,
|
|
CharacterRange trail,
|
|
bool read_backward,
|
|
RegExpNode* on_success,
|
|
RegExpFlags flags);
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t characters_filled_in,
|
|
bool not_at_start);
|
|
ZoneGrowableArray<TextElement>* elements() { return elms_; }
|
|
bool read_backward() { return read_backward_; }
|
|
void MakeCaseIndependent(bool is_one_byte);
|
|
virtual intptr_t GreedyLoopTextLength();
|
|
virtual RegExpNode* GetSuccessorOfOmnivorousTextNode(
|
|
RegExpCompiler* compiler);
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start);
|
|
void CalculateOffsets();
|
|
virtual RegExpNode* FilterOneByte(intptr_t depth);
|
|
|
|
private:
|
|
enum TextEmitPassType {
|
|
NON_LATIN1_MATCH, // Check for characters that can't match.
|
|
SIMPLE_CHARACTER_MATCH, // Case-dependent single character check.
|
|
NON_LETTER_CHARACTER_MATCH, // Check characters that have no case equivs.
|
|
CASE_CHARACTER_MATCH, // Case-independent single character check.
|
|
CHARACTER_CLASS_MATCH // Character class.
|
|
};
|
|
static bool SkipPass(intptr_t pass, bool ignore_case);
|
|
static const intptr_t kFirstRealPass = SIMPLE_CHARACTER_MATCH;
|
|
static const intptr_t kLastPass = CHARACTER_CLASS_MATCH;
|
|
void TextEmitPass(RegExpCompiler* compiler,
|
|
TextEmitPassType pass,
|
|
bool preloaded,
|
|
Trace* trace,
|
|
bool first_element_checked,
|
|
intptr_t* checked_up_to);
|
|
intptr_t Length();
|
|
ZoneGrowableArray<TextElement>* elms_;
|
|
bool read_backward_;
|
|
};
|
|
|
|
class AssertionNode : public SeqRegExpNode {
|
|
public:
|
|
enum AssertionType {
|
|
AT_END,
|
|
AT_START,
|
|
AT_BOUNDARY,
|
|
AT_NON_BOUNDARY,
|
|
AFTER_NEWLINE
|
|
};
|
|
static AssertionNode* AtEnd(RegExpNode* on_success) {
|
|
return new (on_success->zone()) AssertionNode(AT_END, on_success);
|
|
}
|
|
static AssertionNode* AtStart(RegExpNode* on_success) {
|
|
return new (on_success->zone()) AssertionNode(AT_START, on_success);
|
|
}
|
|
static AssertionNode* AtBoundary(RegExpNode* on_success) {
|
|
return new (on_success->zone()) AssertionNode(AT_BOUNDARY, on_success);
|
|
}
|
|
static AssertionNode* AtNonBoundary(RegExpNode* on_success) {
|
|
return new (on_success->zone()) AssertionNode(AT_NON_BOUNDARY, on_success);
|
|
}
|
|
static AssertionNode* AfterNewline(RegExpNode* on_success) {
|
|
return new (on_success->zone()) AssertionNode(AFTER_NEWLINE, on_success);
|
|
}
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t filled_in,
|
|
bool not_at_start);
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start);
|
|
AssertionType assertion_type() { return assertion_type_; }
|
|
|
|
private:
|
|
void EmitBoundaryCheck(RegExpCompiler* compiler, Trace* trace);
|
|
enum IfPrevious { kIsNonWord, kIsWord };
|
|
void BacktrackIfPrevious(RegExpCompiler* compiler,
|
|
Trace* trace,
|
|
IfPrevious backtrack_if_previous);
|
|
AssertionNode(AssertionType t, RegExpNode* on_success)
|
|
: SeqRegExpNode(on_success), assertion_type_(t) {}
|
|
AssertionType assertion_type_;
|
|
};
|
|
|
|
class BackReferenceNode : public SeqRegExpNode {
|
|
public:
|
|
BackReferenceNode(intptr_t start_reg,
|
|
intptr_t end_reg,
|
|
RegExpFlags flags,
|
|
bool read_backward,
|
|
RegExpNode* on_success)
|
|
: SeqRegExpNode(on_success),
|
|
start_reg_(start_reg),
|
|
end_reg_(end_reg),
|
|
flags_(flags),
|
|
read_backward_(read_backward) {}
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
intptr_t start_register() { return start_reg_; }
|
|
intptr_t end_register() { return end_reg_; }
|
|
bool read_backward() { return read_backward_; }
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t recursion_depth,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t characters_filled_in,
|
|
bool not_at_start) {
|
|
return;
|
|
}
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start);
|
|
|
|
private:
|
|
intptr_t start_reg_;
|
|
intptr_t end_reg_;
|
|
RegExpFlags flags_;
|
|
bool read_backward_;
|
|
};
|
|
|
|
class EndNode : public RegExpNode {
|
|
public:
|
|
enum Action { ACCEPT, BACKTRACK, NEGATIVE_SUBMATCH_SUCCESS };
|
|
explicit EndNode(Action action, Zone* zone)
|
|
: RegExpNode(zone), action_(action) {}
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t recursion_depth,
|
|
bool not_at_start) {
|
|
return 0;
|
|
}
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t characters_filled_in,
|
|
bool not_at_start) {
|
|
// Returning 0 from EatsAtLeast should ensure we never get here.
|
|
UNREACHABLE();
|
|
}
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start) {
|
|
// Returning 0 from EatsAtLeast should ensure we never get here.
|
|
UNREACHABLE();
|
|
}
|
|
|
|
private:
|
|
Action action_;
|
|
};
|
|
|
|
class NegativeSubmatchSuccess : public EndNode {
|
|
public:
|
|
NegativeSubmatchSuccess(intptr_t stack_pointer_reg,
|
|
intptr_t position_reg,
|
|
intptr_t clear_capture_count,
|
|
intptr_t clear_capture_start,
|
|
Zone* zone)
|
|
: EndNode(NEGATIVE_SUBMATCH_SUCCESS, zone),
|
|
stack_pointer_register_(stack_pointer_reg),
|
|
current_position_register_(position_reg),
|
|
clear_capture_count_(clear_capture_count),
|
|
clear_capture_start_(clear_capture_start) {}
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
|
|
private:
|
|
intptr_t stack_pointer_register_;
|
|
intptr_t current_position_register_;
|
|
intptr_t clear_capture_count_;
|
|
intptr_t clear_capture_start_;
|
|
};
|
|
|
|
class Guard : public ZoneAllocated {
|
|
public:
|
|
enum Relation { LT, GEQ };
|
|
Guard(intptr_t reg, Relation op, intptr_t value)
|
|
: reg_(reg), op_(op), value_(value) {}
|
|
intptr_t reg() { return reg_; }
|
|
Relation op() { return op_; }
|
|
intptr_t value() { return value_; }
|
|
|
|
private:
|
|
intptr_t reg_;
|
|
Relation op_;
|
|
intptr_t value_;
|
|
};
|
|
|
|
class GuardedAlternative {
|
|
public:
|
|
explicit GuardedAlternative(RegExpNode* node) : node_(node), guards_(NULL) {}
|
|
void AddGuard(Guard* guard, Zone* zone);
|
|
RegExpNode* node() const { return node_; }
|
|
void set_node(RegExpNode* node) { node_ = node; }
|
|
ZoneGrowableArray<Guard*>* guards() const { return guards_; }
|
|
|
|
private:
|
|
RegExpNode* node_;
|
|
ZoneGrowableArray<Guard*>* guards_;
|
|
|
|
DISALLOW_ALLOCATION();
|
|
};
|
|
|
|
struct AlternativeGeneration;
|
|
|
|
class ChoiceNode : public RegExpNode {
|
|
public:
|
|
explicit ChoiceNode(intptr_t expected_size, Zone* zone)
|
|
: RegExpNode(zone),
|
|
alternatives_(new (zone)
|
|
ZoneGrowableArray<GuardedAlternative>(expected_size)),
|
|
not_at_start_(false),
|
|
being_calculated_(false) {}
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
void AddAlternative(GuardedAlternative node) { alternatives()->Add(node); }
|
|
ZoneGrowableArray<GuardedAlternative>* alternatives() {
|
|
return alternatives_;
|
|
}
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
bool not_at_start);
|
|
intptr_t EatsAtLeastHelper(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
RegExpNode* ignore_this_node,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t characters_filled_in,
|
|
bool not_at_start);
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start);
|
|
|
|
bool being_calculated() { return being_calculated_; }
|
|
bool not_at_start() { return not_at_start_; }
|
|
void set_not_at_start() { not_at_start_ = true; }
|
|
void set_being_calculated(bool b) { being_calculated_ = b; }
|
|
virtual bool try_to_emit_quick_check_for_alternative(bool is_first) {
|
|
return true;
|
|
}
|
|
virtual RegExpNode* FilterOneByte(intptr_t depth);
|
|
virtual bool read_backward() { return false; }
|
|
|
|
protected:
|
|
intptr_t GreedyLoopTextLengthForAlternative(
|
|
const GuardedAlternative* alternative);
|
|
ZoneGrowableArray<GuardedAlternative>* alternatives_;
|
|
|
|
private:
|
|
friend class Analysis;
|
|
void GenerateGuard(RegExpMacroAssembler* macro_assembler,
|
|
Guard* guard,
|
|
Trace* trace);
|
|
intptr_t CalculatePreloadCharacters(RegExpCompiler* compiler,
|
|
intptr_t eats_at_least);
|
|
void EmitOutOfLineContinuation(RegExpCompiler* compiler,
|
|
Trace* trace,
|
|
GuardedAlternative alternative,
|
|
AlternativeGeneration* alt_gen,
|
|
intptr_t preload_characters,
|
|
bool next_expects_preload);
|
|
void SetUpPreLoad(RegExpCompiler* compiler,
|
|
Trace* current_trace,
|
|
PreloadState* preloads);
|
|
void AssertGuardsMentionRegisters(Trace* trace);
|
|
intptr_t EmitOptimizedUnanchoredSearch(RegExpCompiler* compiler,
|
|
Trace* trace);
|
|
Trace* EmitGreedyLoop(RegExpCompiler* compiler,
|
|
Trace* trace,
|
|
AlternativeGenerationList* alt_gens,
|
|
PreloadState* preloads,
|
|
GreedyLoopState* greedy_loop_state,
|
|
intptr_t text_length);
|
|
void EmitChoices(RegExpCompiler* compiler,
|
|
AlternativeGenerationList* alt_gens,
|
|
intptr_t first_choice,
|
|
Trace* trace,
|
|
PreloadState* preloads);
|
|
// If true, this node is never checked at the start of the input.
|
|
// Allows a new trace to start with at_start() set to false.
|
|
bool not_at_start_;
|
|
bool being_calculated_;
|
|
};
|
|
|
|
class NegativeLookaroundChoiceNode : public ChoiceNode {
|
|
public:
|
|
explicit NegativeLookaroundChoiceNode(GuardedAlternative this_must_fail,
|
|
GuardedAlternative then_do_this,
|
|
Zone* zone)
|
|
: ChoiceNode(2, zone) {
|
|
AddAlternative(this_must_fail);
|
|
AddAlternative(then_do_this);
|
|
}
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t characters_filled_in,
|
|
bool not_at_start);
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start) {
|
|
(*alternatives_)[1].node()->FillInBMInfo(offset, budget - 1, bm,
|
|
not_at_start);
|
|
if (offset == 0) set_bm_info(not_at_start, bm);
|
|
}
|
|
// For a negative lookahead we don't emit the quick check for the
|
|
// alternative that is expected to fail. This is because quick check code
|
|
// starts by loading enough characters for the alternative that takes fewest
|
|
// characters, but on a negative lookahead the negative branch did not take
|
|
// part in that calculation (EatsAtLeast) so the assumptions don't hold.
|
|
virtual bool try_to_emit_quick_check_for_alternative(bool is_first) {
|
|
return !is_first;
|
|
}
|
|
virtual RegExpNode* FilterOneByte(intptr_t depth);
|
|
};
|
|
|
|
class LoopChoiceNode : public ChoiceNode {
|
|
public:
|
|
explicit LoopChoiceNode(bool body_can_be_zero_length,
|
|
bool read_backward,
|
|
Zone* zone)
|
|
: ChoiceNode(2, zone),
|
|
loop_node_(NULL),
|
|
continue_node_(NULL),
|
|
body_can_be_zero_length_(body_can_be_zero_length),
|
|
read_backward_(read_backward) {}
|
|
void AddLoopAlternative(GuardedAlternative alt);
|
|
void AddContinueAlternative(GuardedAlternative alt);
|
|
virtual void Emit(RegExpCompiler* compiler, Trace* trace);
|
|
virtual intptr_t EatsAtLeast(intptr_t still_to_find,
|
|
intptr_t budget,
|
|
bool not_at_start);
|
|
virtual void GetQuickCheckDetails(QuickCheckDetails* details,
|
|
RegExpCompiler* compiler,
|
|
intptr_t characters_filled_in,
|
|
bool not_at_start);
|
|
virtual void FillInBMInfo(intptr_t offset,
|
|
intptr_t budget,
|
|
BoyerMooreLookahead* bm,
|
|
bool not_at_start);
|
|
RegExpNode* loop_node() { return loop_node_; }
|
|
RegExpNode* continue_node() { return continue_node_; }
|
|
bool body_can_be_zero_length() { return body_can_be_zero_length_; }
|
|
virtual bool read_backward() { return read_backward_; }
|
|
virtual void Accept(NodeVisitor* visitor);
|
|
virtual RegExpNode* FilterOneByte(intptr_t depth);
|
|
|
|
private:
|
|
// AddAlternative is made private for loop nodes because alternatives
|
|
// should not be added freely, we need to keep track of which node
|
|
// goes back to the node itself.
|
|
void AddAlternative(GuardedAlternative node) {
|
|
ChoiceNode::AddAlternative(node);
|
|
}
|
|
|
|
RegExpNode* loop_node_;
|
|
RegExpNode* continue_node_;
|
|
bool body_can_be_zero_length_;
|
|
bool read_backward_;
|
|
};
|
|
|
|
// Improve the speed that we scan for an initial point where a non-anchored
|
|
// regexp can match by using a Boyer-Moore-like table. This is done by
|
|
// identifying non-greedy non-capturing loops in the nodes that eat any
|
|
// character one at a time. For example in the middle of the regexp
|
|
// /foo[\s\S]*?bar/ we find such a loop. There is also such a loop implicitly
|
|
// inserted at the start of any non-anchored regexp.
|
|
//
|
|
// When we have found such a loop we look ahead in the nodes to find the set of
|
|
// characters that can come at given distances. For example for the regexp
|
|
// /.?foo/ we know that there are at least 3 characters ahead of us, and the
|
|
// sets of characters that can occur are [any, [f, o], [o]]. We find a range in
|
|
// the lookahead info where the set of characters is reasonably constrained. In
|
|
// our example this is from index 1 to 2 (0 is not constrained). We can now
|
|
// look 3 characters ahead and if we don't find one of [f, o] (the union of
|
|
// [f, o] and [o]) then we can skip forwards by the range size (in this case 2).
|
|
//
|
|
// For Unicode input strings we do the same, but modulo 128.
|
|
//
|
|
// We also look at the first string fed to the regexp and use that to get a hint
|
|
// of the character frequencies in the inputs. This affects the assessment of
|
|
// whether the set of characters is 'reasonably constrained'.
|
|
//
|
|
// We also have another lookahead mechanism (called quick check in the code),
|
|
// which uses a wide load of multiple characters followed by a mask and compare
|
|
// to determine whether a match is possible at this point.
|
|
enum ContainedInLattice {
|
|
kNotYet = 0,
|
|
kLatticeIn = 1,
|
|
kLatticeOut = 2,
|
|
kLatticeUnknown = 3 // Can also mean both in and out.
|
|
};
|
|
|
|
inline ContainedInLattice Combine(ContainedInLattice a, ContainedInLattice b) {
|
|
return static_cast<ContainedInLattice>(a | b);
|
|
}
|
|
|
|
ContainedInLattice AddRange(ContainedInLattice a,
|
|
const intptr_t* ranges,
|
|
intptr_t ranges_size,
|
|
Interval new_range);
|
|
|
|
class BoyerMoorePositionInfo : public ZoneAllocated {
|
|
public:
|
|
explicit BoyerMoorePositionInfo(Zone* zone)
|
|
: map_(new (zone) ZoneGrowableArray<bool>(kMapSize)),
|
|
map_count_(0),
|
|
w_(kNotYet),
|
|
s_(kNotYet),
|
|
d_(kNotYet),
|
|
surrogate_(kNotYet) {
|
|
for (intptr_t i = 0; i < kMapSize; i++) {
|
|
map_->Add(false);
|
|
}
|
|
}
|
|
|
|
bool& at(intptr_t i) { return (*map_)[i]; }
|
|
|
|
static const intptr_t kMapSize = 128;
|
|
static const intptr_t kMask = kMapSize - 1;
|
|
|
|
intptr_t map_count() const { return map_count_; }
|
|
|
|
void Set(intptr_t character);
|
|
void SetInterval(const Interval& interval);
|
|
void SetAll();
|
|
bool is_non_word() { return w_ == kLatticeOut; }
|
|
bool is_word() { return w_ == kLatticeIn; }
|
|
|
|
private:
|
|
ZoneGrowableArray<bool>* map_;
|
|
intptr_t map_count_; // Number of set bits in the map.
|
|
ContainedInLattice w_; // The \w character class.
|
|
ContainedInLattice s_; // The \s character class.
|
|
ContainedInLattice d_; // The \d character class.
|
|
ContainedInLattice surrogate_; // Surrogate UTF-16 code units.
|
|
};
|
|
|
|
class BoyerMooreLookahead : public ZoneAllocated {
|
|
public:
|
|
BoyerMooreLookahead(intptr_t length, RegExpCompiler* compiler, Zone* Zone);
|
|
|
|
intptr_t length() { return length_; }
|
|
intptr_t max_char() { return max_char_; }
|
|
RegExpCompiler* compiler() { return compiler_; }
|
|
|
|
intptr_t Count(intptr_t map_number) {
|
|
return bitmaps_->At(map_number)->map_count();
|
|
}
|
|
|
|
BoyerMoorePositionInfo* at(intptr_t i) { return bitmaps_->At(i); }
|
|
|
|
void Set(intptr_t map_number, intptr_t character) {
|
|
if (character > max_char_) return;
|
|
BoyerMoorePositionInfo* info = bitmaps_->At(map_number);
|
|
info->Set(character);
|
|
}
|
|
|
|
void SetInterval(intptr_t map_number, const Interval& interval) {
|
|
if (interval.from() > max_char_) return;
|
|
BoyerMoorePositionInfo* info = bitmaps_->At(map_number);
|
|
if (interval.to() > max_char_) {
|
|
info->SetInterval(Interval(interval.from(), max_char_));
|
|
} else {
|
|
info->SetInterval(interval);
|
|
}
|
|
}
|
|
|
|
void SetAll(intptr_t map_number) { bitmaps_->At(map_number)->SetAll(); }
|
|
|
|
void SetRest(intptr_t from_map) {
|
|
for (intptr_t i = from_map; i < length_; i++)
|
|
SetAll(i);
|
|
}
|
|
void EmitSkipInstructions(RegExpMacroAssembler* masm);
|
|
|
|
private:
|
|
// This is the value obtained by EatsAtLeast. If we do not have at least this
|
|
// many characters left in the sample string then the match is bound to fail.
|
|
// Therefore it is OK to read a character this far ahead of the current match
|
|
// point.
|
|
intptr_t length_;
|
|
RegExpCompiler* compiler_;
|
|
// 0xff for Latin1, 0xffff for UTF-16.
|
|
intptr_t max_char_;
|
|
ZoneGrowableArray<BoyerMoorePositionInfo*>* bitmaps_;
|
|
|
|
intptr_t GetSkipTable(intptr_t min_lookahead,
|
|
intptr_t max_lookahead,
|
|
const TypedData& boolean_skip_table);
|
|
bool FindWorthwhileInterval(intptr_t* from, intptr_t* to);
|
|
intptr_t FindBestInterval(intptr_t max_number_of_chars,
|
|
intptr_t old_biggest_points,
|
|
intptr_t* from,
|
|
intptr_t* to);
|
|
};
|
|
|
|
// There are many ways to generate code for a node. This class encapsulates
|
|
// the current way we should be generating. In other words it encapsulates
|
|
// the current state of the code generator. The effect of this is that we
|
|
// generate code for paths that the matcher can take through the regular
|
|
// expression. A given node in the regexp can be code-generated several times
|
|
// as it can be part of several traces. For example for the regexp:
|
|
// /foo(bar|ip)baz/ the code to match baz will be generated twice, once as part
|
|
// of the foo-bar-baz trace and once as part of the foo-ip-baz trace. The code
|
|
// to match foo is generated only once (the traces have a common prefix). The
|
|
// code to store the capture is deferred and generated (twice) after the places
|
|
// where baz has been matched.
|
|
class Trace {
|
|
public:
|
|
// A value for a property that is either known to be true, know to be false,
|
|
// or not known.
|
|
enum TriBool { UNKNOWN = -1, FALSE_VALUE = 0, TRUE_VALUE = 1 };
|
|
|
|
class DeferredAction {
|
|
public:
|
|
DeferredAction(ActionNode::ActionType action_type, intptr_t reg)
|
|
: action_type_(action_type), reg_(reg), next_(NULL) {}
|
|
DeferredAction* next() { return next_; }
|
|
bool Mentions(intptr_t reg);
|
|
intptr_t reg() { return reg_; }
|
|
ActionNode::ActionType action_type() { return action_type_; }
|
|
|
|
private:
|
|
ActionNode::ActionType action_type_;
|
|
intptr_t reg_;
|
|
DeferredAction* next_;
|
|
friend class Trace;
|
|
|
|
DISALLOW_ALLOCATION();
|
|
};
|
|
|
|
class DeferredCapture : public DeferredAction {
|
|
public:
|
|
DeferredCapture(intptr_t reg, bool is_capture, Trace* trace)
|
|
: DeferredAction(ActionNode::STORE_POSITION, reg),
|
|
cp_offset_(trace->cp_offset()),
|
|
is_capture_(is_capture) {}
|
|
intptr_t cp_offset() { return cp_offset_; }
|
|
bool is_capture() { return is_capture_; }
|
|
|
|
private:
|
|
intptr_t cp_offset_;
|
|
bool is_capture_;
|
|
void set_cp_offset(intptr_t cp_offset) { cp_offset_ = cp_offset; }
|
|
};
|
|
|
|
class DeferredSetRegister : public DeferredAction {
|
|
public:
|
|
DeferredSetRegister(intptr_t reg, intptr_t value)
|
|
: DeferredAction(ActionNode::SET_REGISTER, reg), value_(value) {}
|
|
intptr_t value() { return value_; }
|
|
|
|
private:
|
|
intptr_t value_;
|
|
};
|
|
|
|
class DeferredClearCaptures : public DeferredAction {
|
|
public:
|
|
explicit DeferredClearCaptures(Interval range)
|
|
: DeferredAction(ActionNode::CLEAR_CAPTURES, -1), range_(range) {}
|
|
Interval range() { return range_; }
|
|
|
|
private:
|
|
Interval range_;
|
|
};
|
|
|
|
class DeferredIncrementRegister : public DeferredAction {
|
|
public:
|
|
explicit DeferredIncrementRegister(intptr_t reg)
|
|
: DeferredAction(ActionNode::INCREMENT_REGISTER, reg) {}
|
|
};
|
|
|
|
Trace()
|
|
: cp_offset_(0),
|
|
actions_(NULL),
|
|
backtrack_(NULL),
|
|
stop_node_(NULL),
|
|
loop_label_(NULL),
|
|
characters_preloaded_(0),
|
|
bound_checked_up_to_(0),
|
|
flush_budget_(100),
|
|
at_start_(UNKNOWN) {}
|
|
|
|
// End the trace. This involves flushing the deferred actions in the trace
|
|
// and pushing a backtrack location onto the backtrack stack. Once this is
|
|
// done we can start a new trace or go to one that has already been
|
|
// generated.
|
|
void Flush(RegExpCompiler* compiler, RegExpNode* successor);
|
|
intptr_t cp_offset() { return cp_offset_; }
|
|
DeferredAction* actions() { return actions_; }
|
|
// A trivial trace is one that has no deferred actions or other state that
|
|
// affects the assumptions used when generating code. There is no recorded
|
|
// backtrack location in a trivial trace, so with a trivial trace we will
|
|
// generate code that, on a failure to match, gets the backtrack location
|
|
// from the backtrack stack rather than using a direct jump instruction. We
|
|
// always start code generation with a trivial trace and non-trivial traces
|
|
// are created as we emit code for nodes or add to the list of deferred
|
|
// actions in the trace. The location of the code generated for a node using
|
|
// a trivial trace is recorded in a label in the node so that gotos can be
|
|
// generated to that code.
|
|
bool is_trivial() {
|
|
return backtrack_ == NULL && actions_ == NULL && cp_offset_ == 0 &&
|
|
characters_preloaded_ == 0 && bound_checked_up_to_ == 0 &&
|
|
quick_check_performed_.characters() == 0 && at_start_ == UNKNOWN;
|
|
}
|
|
TriBool at_start() { return at_start_; }
|
|
void set_at_start(TriBool at_start) { at_start_ = at_start; }
|
|
BlockLabel* backtrack() { return backtrack_; }
|
|
BlockLabel* loop_label() { return loop_label_; }
|
|
RegExpNode* stop_node() { return stop_node_; }
|
|
intptr_t characters_preloaded() { return characters_preloaded_; }
|
|
intptr_t bound_checked_up_to() { return bound_checked_up_to_; }
|
|
intptr_t flush_budget() { return flush_budget_; }
|
|
QuickCheckDetails* quick_check_performed() { return &quick_check_performed_; }
|
|
bool mentions_reg(intptr_t reg);
|
|
// Returns true if a deferred position store exists to the specified
|
|
// register and stores the offset in the out-parameter. Otherwise
|
|
// returns false.
|
|
bool GetStoredPosition(intptr_t reg, intptr_t* cp_offset);
|
|
// These set methods and AdvanceCurrentPositionInTrace should be used only on
|
|
// new traces - the intention is that traces are immutable after creation.
|
|
void add_action(DeferredAction* new_action) {
|
|
ASSERT(new_action->next_ == NULL);
|
|
new_action->next_ = actions_;
|
|
actions_ = new_action;
|
|
}
|
|
void set_backtrack(BlockLabel* backtrack) { backtrack_ = backtrack; }
|
|
void set_stop_node(RegExpNode* node) { stop_node_ = node; }
|
|
void set_loop_label(BlockLabel* label) { loop_label_ = label; }
|
|
void set_characters_preloaded(intptr_t count) {
|
|
characters_preloaded_ = count;
|
|
}
|
|
void set_bound_checked_up_to(intptr_t to) { bound_checked_up_to_ = to; }
|
|
void set_flush_budget(intptr_t to) { flush_budget_ = to; }
|
|
void set_quick_check_performed(QuickCheckDetails* d) {
|
|
quick_check_performed_ = *d;
|
|
}
|
|
void InvalidateCurrentCharacter();
|
|
void AdvanceCurrentPositionInTrace(intptr_t by, RegExpCompiler* compiler);
|
|
|
|
private:
|
|
intptr_t FindAffectedRegisters(OutSet* affected_registers, Zone* zone);
|
|
void PerformDeferredActions(RegExpMacroAssembler* macro,
|
|
intptr_t max_register,
|
|
const OutSet& affected_registers,
|
|
OutSet* registers_to_pop,
|
|
OutSet* registers_to_clear,
|
|
Zone* zone);
|
|
void RestoreAffectedRegisters(RegExpMacroAssembler* macro,
|
|
intptr_t max_register,
|
|
const OutSet& registers_to_pop,
|
|
const OutSet& registers_to_clear);
|
|
intptr_t cp_offset_;
|
|
DeferredAction* actions_;
|
|
BlockLabel* backtrack_;
|
|
RegExpNode* stop_node_;
|
|
BlockLabel* loop_label_;
|
|
intptr_t characters_preloaded_;
|
|
intptr_t bound_checked_up_to_;
|
|
QuickCheckDetails quick_check_performed_;
|
|
intptr_t flush_budget_;
|
|
TriBool at_start_;
|
|
|
|
DISALLOW_ALLOCATION();
|
|
};
|
|
|
|
class GreedyLoopState {
|
|
public:
|
|
explicit GreedyLoopState(bool not_at_start);
|
|
|
|
BlockLabel* label() { return &label_; }
|
|
Trace* counter_backtrack_trace() { return &counter_backtrack_trace_; }
|
|
|
|
private:
|
|
BlockLabel label_;
|
|
Trace counter_backtrack_trace_;
|
|
};
|
|
|
|
struct PreloadState {
|
|
static const intptr_t kEatsAtLeastNotYetInitialized = -1;
|
|
bool preload_is_current_;
|
|
bool preload_has_checked_bounds_;
|
|
intptr_t preload_characters_;
|
|
intptr_t eats_at_least_;
|
|
void init() { eats_at_least_ = kEatsAtLeastNotYetInitialized; }
|
|
|
|
DISALLOW_ALLOCATION();
|
|
};
|
|
|
|
class NodeVisitor : public ValueObject {
|
|
public:
|
|
virtual ~NodeVisitor() {}
|
|
#define DECLARE_VISIT(Type) virtual void Visit##Type(Type##Node* that) = 0;
|
|
FOR_EACH_NODE_TYPE(DECLARE_VISIT)
|
|
#undef DECLARE_VISIT
|
|
virtual void VisitLoopChoice(LoopChoiceNode* that) { VisitChoice(that); }
|
|
};
|
|
|
|
// Assertion propagation moves information about assertions such as
|
|
// \b to the affected nodes. For instance, in /.\b./ information must
|
|
// be propagated to the first '.' that whatever follows needs to know
|
|
// if it matched a word or a non-word, and to the second '.' that it
|
|
// has to check if it succeeds a word or non-word. In this case the
|
|
// result will be something like:
|
|
//
|
|
// +-------+ +------------+
|
|
// | . | | . |
|
|
// +-------+ ---> +------------+
|
|
// | word? | | check word |
|
|
// +-------+ +------------+
|
|
class Analysis : public NodeVisitor {
|
|
public:
|
|
explicit Analysis(bool is_one_byte)
|
|
: is_one_byte_(is_one_byte), error_message_(NULL) {}
|
|
void EnsureAnalyzed(RegExpNode* node);
|
|
|
|
#define DECLARE_VISIT(Type) virtual void Visit##Type(Type##Node* that);
|
|
FOR_EACH_NODE_TYPE(DECLARE_VISIT)
|
|
#undef DECLARE_VISIT
|
|
virtual void VisitLoopChoice(LoopChoiceNode* that);
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|
|
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bool has_failed() { return error_message_ != NULL; }
|
|
const char* error_message() {
|
|
ASSERT(error_message_ != NULL);
|
|
return error_message_;
|
|
}
|
|
void fail(const char* error_message) { error_message_ = error_message; }
|
|
|
|
private:
|
|
bool is_one_byte_;
|
|
const char* error_message_;
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(Analysis);
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|
};
|
|
|
|
struct RegExpCompileData : public ZoneAllocated {
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|
RegExpCompileData()
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|
: tree(NULL),
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|
node(NULL),
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|
simple(true),
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|
contains_anchor(false),
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|
capture_name_map(Array::Handle(Array::null())),
|
|
error(String::Handle(String::null())),
|
|
capture_count(0) {}
|
|
RegExpTree* tree;
|
|
RegExpNode* node;
|
|
bool simple;
|
|
bool contains_anchor;
|
|
Array& capture_name_map;
|
|
String& error;
|
|
intptr_t capture_count;
|
|
};
|
|
|
|
class RegExpEngine : public AllStatic {
|
|
public:
|
|
struct CompilationResult {
|
|
explicit CompilationResult(const char* error_message)
|
|
: error_message(error_message),
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
backtrack_goto(NULL),
|
|
graph_entry(NULL),
|
|
num_blocks(-1),
|
|
num_stack_locals(-1),
|
|
#endif
|
|
bytecode(NULL),
|
|
num_registers(-1) {
|
|
}
|
|
|
|
CompilationResult(TypedData* bytecode, intptr_t num_registers)
|
|
: error_message(NULL),
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
backtrack_goto(NULL),
|
|
graph_entry(NULL),
|
|
num_blocks(-1),
|
|
num_stack_locals(-1),
|
|
#endif
|
|
bytecode(bytecode),
|
|
num_registers(num_registers) {
|
|
}
|
|
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
CompilationResult(IndirectGotoInstr* backtrack_goto,
|
|
GraphEntryInstr* graph_entry,
|
|
intptr_t num_blocks,
|
|
intptr_t num_stack_locals,
|
|
intptr_t num_registers)
|
|
: error_message(NULL),
|
|
backtrack_goto(backtrack_goto),
|
|
graph_entry(graph_entry),
|
|
num_blocks(num_blocks),
|
|
num_stack_locals(num_stack_locals),
|
|
bytecode(NULL) {}
|
|
#endif
|
|
|
|
const char* error_message;
|
|
|
|
NOT_IN_PRECOMPILED(IndirectGotoInstr* backtrack_goto);
|
|
NOT_IN_PRECOMPILED(GraphEntryInstr* graph_entry);
|
|
NOT_IN_PRECOMPILED(const intptr_t num_blocks);
|
|
NOT_IN_PRECOMPILED(const intptr_t num_stack_locals);
|
|
|
|
TypedData* bytecode;
|
|
intptr_t num_registers;
|
|
};
|
|
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
static CompilationResult CompileIR(
|
|
RegExpCompileData* input,
|
|
const ParsedFunction* parsed_function,
|
|
const ZoneGrowableArray<const ICData*>& ic_data_array,
|
|
intptr_t osr_id);
|
|
#endif
|
|
|
|
static CompilationResult CompileBytecode(RegExpCompileData* data,
|
|
const RegExp& regexp,
|
|
bool is_one_byte,
|
|
bool sticky,
|
|
Zone* zone);
|
|
|
|
static RawRegExp* CreateRegExp(Thread* thread,
|
|
const String& pattern,
|
|
RegExpFlags flags);
|
|
|
|
static void DotPrint(const char* label, RegExpNode* node, bool ignore_case);
|
|
};
|
|
|
|
} // namespace dart
|
|
|
|
#endif // RUNTIME_VM_REGEXP_H_
|