Port and integrate the irregexp engine from V8

runtime/vm/intrinsifier_arm.cc

Index: runtime/vm/intrinsifier_arm.cc
diff --git a/runtime/vm/intrinsifier_arm.cc b/runtime/vm/intrinsifier_arm.cc
index 8a4268d8db7153f096b74ca78567b8ab157b9ff7..1e30baedbc4ede8d5e57105ac620d51663162d9f 100644
--- a/runtime/vm/intrinsifier_arm.cc
+++ b/runtime/vm/intrinsifier_arm.cc
@@ -9,9 +9,11 @@
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
+#include "vm/dart_entry.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
+#include "vm/regexp_assembler.h"
 #include "vm/symbols.h"
 
 namespace dart {
@@ -1846,6 +1848,45 @@ void Intrinsifier::TwoByteString_equality(Assembler* assembler) {
 }
 
 
+#ifndef USE_JSCRE
+void Intrinsifier::JSRegExp_ExecuteMatch(Assembler* assembler) {
+  static const intptr_t kRegExpParamOffset = + 2 * kWordSize;
+  static const intptr_t kStringParamOffset = + 1 * kWordSize;
+  // const Smi& start_index is located at   (+ 0 * kWordSize).
+
+  // Register assignments are as follows:
+  // R0: The appropriate specialized matcher function.
+  // R2: The regexp object.
+  // R5: Temp.
+  // R1: Temp, Pointer to the function's code which we then tail-call.
+
+  __ ldr(R2, Address(SP, kRegExpParamOffset));
+  __ ldr(R1, Address(SP, kStringParamOffset));
+
+  // Load the specialized function pointer into R0. Leverage the fact the
+  // string CIDs as well as stored function pointers are in sequence.
+
+  __ LoadClassId(R1, R1);
+  __ AddImmediate(R1, R1, -kOneByteStringCid);
+  __ add(R1, R2, Operand(R1, LSL, kWordSizeLog2));
+  __ ldr(R0, FieldAddress(R1, JSRegExp::function_offset(kOneByteStringCid)));
+
+  // Registers have been set up for the lazy compile stub at this point.
+  // It expects the function in R0, the argument descriptor in R4, and
+  // IC-Data in R5. Explicitly null out IC-Data to ensure its validity.
+
+  static const intptr_t arg_count = RegExpMacroAssembler::kParamCount;
+  __ LoadObject(R4, Array::Handle(ArgumentsDescriptor::New(arg_count)));
+  __ eor(R5, R5, Operand(R5));
+
+  // Tail-call the function.
+  __ ldr(R1, FieldAddress(R0, Function::instructions_offset()));
+  __ AddImmediate(R1, Instructions::HeaderSize() - kHeapObjectTag);
+  __ bx(R1);
+}
+#endif
+
+
 // On stack: user tag (+0).
 void Intrinsifier::UserTag_makeCurrent(Assembler* assembler) {
   // R1: Isolate.