Port and integrate the irregexp engine from V8

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index cd60a4f378647e708293e5e7ed9c6b31591aba03..772f34e068efd1840cd53842ecbf5218c0183fcb 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -1643,6 +1643,16 @@ class Function : public Object {
   RawClass* origin() const;
   RawScript* script() const;
 
+  void set_regexp(const JSRegExp& value) const;
+  RawJSRegExp* regexp() const { return raw_ptr()->regexp_; }
+
+  void set_regexp_specialization(intptr_t cid) {
+    raw_ptr()->regexp_specialization_ = cid;
+  }
+  intptr_t regexp_specialization() const {
+    return raw_ptr()->regexp_specialization_;
+  }
+
   RawAbstractType* result_type() const { return raw_ptr()->result_type_; }
   void set_result_type(const AbstractType& value) const;
 
@@ -1771,6 +1781,7 @@ class Function : public Object {
       case RawFunction::kMethodExtractor:
       case RawFunction::kNoSuchMethodDispatcher:
       case RawFunction::kInvokeFieldDispatcher:
+      case RawFunction::kIrregexpFunction:
         return true;
       case RawFunction::kClosureFunction:
       case RawFunction::kConstructor:
@@ -1792,6 +1803,7 @@ class Function : public Object {
       case RawFunction::kImplicitGetter:
       case RawFunction::kImplicitSetter:
       case RawFunction::kImplicitStaticFinalGetter:
+      case RawFunction::kIrregexpFunction:
         return true;
       case RawFunction::kClosureFunction:
       case RawFunction::kConstructor:
@@ -2031,6 +2043,11 @@ class Function : public Object {
     return kind() == RawFunction::kClosureFunction;
   }
 
+  // Returns true if this function represents a generated irregexp function.
+  bool IsIrregexpFunction() const {
+    return kind() == RawFunction::kIrregexpFunction;
+  }
+
   // Returns true if this function represents an implicit closure function.
   bool IsImplicitClosureFunction() const;
 
@@ -7168,11 +7185,63 @@ class JSRegExp : public Instance {
   bool is_multi_line() const { return (flags() & kMultiLine); }
 
   RawString* pattern() const { return raw_ptr()->pattern_; }
+
+  static intptr_t subject_offset(intptr_t cid) {
+    switch (cid) {
+      case kOneByteStringCid: return OFFSET_OF(RawJSRegExp, one_byte_subject_);
+      case kTwoByteStringCid: return OFFSET_OF(RawJSRegExp, two_byte_subject_);
+      case kExternalOneByteStringCid:
+         return OFFSET_OF(RawJSRegExp, external_one_byte_subject_);
+      case kExternalTwoByteStringCid:
+        return OFFSET_OF(RawJSRegExp, external_two_byte_subject_);
+    }
+
+    UNREACHABLE();
+    return -1;
+  }
+  RawString* sample_subject(intptr_t cid) const {
+    switch (cid) {
+      case kOneByteStringCid: return raw_ptr()->one_byte_subject_;
+      case kTwoByteStringCid: return raw_ptr()->two_byte_subject_;
+      case kExternalOneByteStringCid:
+         return raw_ptr()->external_one_byte_subject_;
+      case kExternalTwoByteStringCid:
+        return raw_ptr()->external_two_byte_subject_;
+    }
+
+    UNREACHABLE();
+    return String::null();
+  }
+
   RawSmi* num_bracket_expressions() const {
     return raw_ptr()->num_bracket_expressions_;
   }
 
+  static intptr_t function_offset(intptr_t cid) {
+    switch (cid) {
+      case kOneByteStringCid: return OFFSET_OF(RawJSRegExp, one_byte_function_);
+      case kTwoByteStringCid: return OFFSET_OF(RawJSRegExp, two_byte_function_);
+      case kExternalOneByteStringCid:
+         return OFFSET_OF(RawJSRegExp, external_one_byte_function_);
+      case kExternalTwoByteStringCid:
+        return OFFSET_OF(RawJSRegExp, external_two_byte_function_);
+    }
+
+    UNREACHABLE();
+    return -1;
+  }
+  RawFunction* one_byte_function() const {
+    return raw_ptr()->one_byte_function_;
+  }
+
+  RawFunction* two_byte_function() const {
+    return raw_ptr()->two_byte_function_;
+  }
+
   void set_pattern(const String& pattern) const;
+  void set_function(intptr_t cid, const Function& value);
+  void set_sample_subject(intptr_t cid, const String& value) const;
+
   void set_num_bracket_expressions(intptr_t value) const;
   void set_is_global() const { set_flags(flags() | kGlobal); }
   void set_is_ignore_case() const { set_flags(flags() | kIgnoreCase); }