[regexp] implement case-insensitive unicode regexps.

src/regexp/arm/regexp-macro-assembler-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/regexp/arm/regexp-macro-assembler-arm.h"
 
 #include "src/code-stubs.h"
 #include "src/log.h"
@@ skipping 192 matching lines @@
 void RegExpMacroAssemblerARM::CheckGreedyLoop(Label* on_equal) {
   __ ldr(r0, MemOperand(backtrack_stackpointer(), 0));
   __ cmp(current_input_offset(), r0);
   __ add(backtrack_stackpointer(),
          backtrack_stackpointer(), Operand(kPointerSize), LeaveCC, eq);
   BranchOrBacktrack(eq, on_equal);
 }
 
 
 void RegExpMacroAssemblerARM::CheckNotBackReferenceIgnoreCase(
-    int start_reg, bool read_backward, Label* on_no_match) {
+    int start_reg, bool read_backward, bool unicode, Label* on_no_match) {
   Label fallthrough;
   __ ldr(r0, register_location(start_reg));  // Index of start of capture
   __ ldr(r1, register_location(start_reg + 1));  // Index of end of capture
   __ sub(r1, r1, r0, SetCC);  // Length of capture.
 
   // At this point, the capture registers are either both set or both cleared.
   // If the capture length is zero, then the capture is either empty or cleared.
   // Fall through in both cases.
   __ b(eq, &fallthrough);
 
@@ skipping 71 matching lines @@
     __ PrepareCallCFunction(argument_count, r2);
 
     // r0 - offset of start of capture
     // r1 - length of capture
 
     // Put arguments into arguments registers.
     // Parameters are
     //   r0: Address byte_offset1 - Address captured substring's start.
     //   r1: Address byte_offset2 - Address of current character position.
     //   r2: size_t byte_length - length of capture in bytes(!)
-    //   r3: Isolate* isolate
+    //   r3: Isolate* isolate or 0 if unicode flag.
 
     // Address of start of capture.
     __ add(r0, r0, Operand(end_of_input_address()));
     // Length of capture.
     __ mov(r2, Operand(r1));
     // Save length in callee-save register for use on return.
     __ mov(r4, Operand(r1));
     // Address of current input position.
     __ add(r1, current_input_offset(), end_of_input_address());
     if (read_backward) {
       __ sub(r1, r1, r4);
     }
     // Isolate.
-    __ mov(r3, Operand(ExternalReference::isolate_address(isolate())));
+#ifdef V8_I18N_SUPPORT
+    if (unicode) {
+      __ mov(r3, Operand(0));
+    } else  // NOLINT
+#endif      // V8_I18N_SUPPORT
+    {
+      __ mov(r3, Operand(ExternalReference::isolate_address(isolate())));
+    }
 
     {
       AllowExternalCallThatCantCauseGC scope(masm_);
       ExternalReference function =
           ExternalReference::re_case_insensitive_compare_uc16(isolate());
       __ CallCFunction(function, argument_count);
     }
 
     // Check if function returned non-zero for success or zero for failure.
     __ cmp(r0, Operand::Zero());
@@ skipping 903 matching lines @@
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM