[regexp] implement case-insensitive unicode regexps.

src/regexp/mips/regexp-macro-assembler-mips.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_MIPS
 
 #include "src/regexp/mips/regexp-macro-assembler-mips.h"
 
 #include "src/code-stubs.h"
 #include "src/log.h"
@@ skipping 197 matching lines @@
   __ Branch(&backtrack_non_equal, ne, current_input_offset(), Operand(a0));
   __ Addu(backtrack_stackpointer(),
           backtrack_stackpointer(),
           Operand(kPointerSize));
   __ bind(&backtrack_non_equal);
   BranchOrBacktrack(on_equal, eq, current_input_offset(), Operand(a0));
 }
 
 
 void RegExpMacroAssemblerMIPS::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;
   __ lw(a0, register_location(start_reg));  // Index of start of capture.
   __ lw(a1, register_location(start_reg + 1));  // Index of end of capture.
   __ Subu(a1, a1, a0);  // 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.
   __ Branch(&fallthrough, eq, a1, Operand(zero_reg));
 
@@ skipping 74 matching lines @@
     __ PrepareCallCFunction(argument_count, a2);
 
     // a0 - offset of start of capture.
     // a1 - length of capture.
 
     // Put arguments into arguments registers.
     // Parameters are
     //   a0: Address byte_offset1 - Address captured substring's start.
     //   a1: Address byte_offset2 - Address of current character position.
     //   a2: size_t byte_length - length of capture in bytes(!).
-    //   a3: Isolate* isolate.
+    //   a3: Isolate* isolate or 0 if unicode flag.
 
     // Address of start of capture.
     __ Addu(a0, a0, Operand(end_of_input_address()));
     // Length of capture.
     __ mov(a2, a1);
     // Save length in callee-save register for use on return.
     __ mov(s3, a1);
     // Address of current input position.
     __ Addu(a1, current_input_offset(), Operand(end_of_input_address()));
     if (read_backward) {
       __ Subu(a1, a1, Operand(s3));
     }
     // Isolate.
-    __ li(a3, Operand(ExternalReference::isolate_address(masm_->isolate())));
+#ifdef V8_I18N_SUPPORT
+    if (unicode) {
+      __ li(a3, Operand(zero_reg));
+    } else  // NOLINT
+#endif      // V8_I18N_SUPPORT
+    {
+      __ li(a3, Operand(ExternalReference::isolate_address(masm_->isolate())));
+    }
 
     {
       AllowExternalCallThatCantCauseGC scope(masm_);
       ExternalReference function =
           ExternalReference::re_case_insensitive_compare_uc16(masm_->isolate());
       __ CallCFunction(function, argument_count);
     }
 
     // Restore regexp engine registers.
     __ MultiPop(regexp_registers_to_retain);
@@ skipping 943 matching lines @@
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS