Port and integrate the irregexp engine from V8

runtime/vm/intrinsifier_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
+#include "vm/dart_entry.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/instructions.h"
 #include "vm/object_store.h"
+#include "vm/regexp_assembler.h"
 #include "vm/symbols.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, enable_type_checks);
 
 // When entering intrinsics code:
 // RBX: IC Data
 // R10: Arguments descriptor
 // TOS: Return address
@@ skipping 1504 matching lines @@
 void Intrinsifier::OneByteString_equality(Assembler* assembler) {
   StringEquality(assembler, kOneByteStringCid);
 }
 
 
 void Intrinsifier::TwoByteString_equality(Assembler* assembler) {
   StringEquality(assembler, kTwoByteStringCid);
 }
 
 
+#ifndef USE_JSCRE
+void Intrinsifier::JSRegExp_ExecuteMatch(Assembler* assembler) {
+  static const intptr_t kRegExpParamOffset = + 3 * kWordSize;
+  static const intptr_t kStringParamOffset = + 2 * kWordSize;
+  // const Smi& start_index is located at   (+ 1 * kWordSize).
+
+  // Register assignments are as follows:
+  // RAX: The appropriate specialized matcher function.
+  // RBX: The regexp object.
+  // RDI: Temp, Pointer to the function's code which we then tail-call.
+
+  __ movq(RBX, Address(RSP, kRegExpParamOffset));
+  __ movq(RDI, Address(RSP, kStringParamOffset));
+
+  // Load the specialized function pointer into RAX. Leverage the fact the
+  // string CIDs as well as stored function pointers are in sequence.
+
+  __ LoadClassId(RDI, RDI);
+  __ SubImmediate(RDI, Immediate(kOneByteStringCid), PP);
+  __ movq(RAX, FieldAddress(RBX, RDI, TIMES_8,
+                            JSRegExp::function_offset(kOneByteStringCid)));
+
+  // Registers have been set up for the lazy compile stub at this point.
+  // It expects the function in RAX, the argument descriptor in R10, and
+  // IC-Data in RCX. Explicitly null out IC-Data to ensure its validity.
+
+  static const intptr_t arg_count = RegExpMacroAssembler::kParamCount;
+  __ LoadObject(R10, Array::Handle(ArgumentsDescriptor::New(arg_count)), PP);
+  __ xorq(RCX, RCX);
+
+  // Tail-call the function.
+  __ movq(RDI, FieldAddress(RAX, Function::instructions_offset()));
+  __ addq(RDI, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
+  __ jmp(RDI);
+}
+#endif
+
+
 // On stack: user tag (+1), return-address (+0).
 void Intrinsifier::UserTag_makeCurrent(Assembler* assembler) {
   // RBX: Isolate.
   Isolate* isolate = Isolate::Current();
   const Immediate& isolate_address =
       Immediate(reinterpret_cast<int64_t>(isolate));
   __ movq(RBX, isolate_address);
   // RAX: Current user tag.
   __ movq(RAX, Address(RBX, Isolate::current_tag_offset()));
   // R10: UserTag.
@@ skipping 30 matching lines @@
   // Set return value to Isolate::current_tag_.
   __ movq(RAX, Address(RBX, Isolate::current_tag_offset()));
   __ ret();
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64