[regexp] Turn last match info into a simple FixedArray

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1558 matching lines @@
   // Process the result from the native regexp code.
   __ bind(&success);
   __ LoadP(r4,
            FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
   // Calculate number of capture registers (number_of_captures + 1) * 2.
   // SmiToShortArrayOffset accomplishes the multiplication by 2 and
   // SmiUntag (which is a nop for 32-bit).
   __ SmiToShortArrayOffset(r4, r4);
   __ addi(r4, r4, Operand(2));
 
-  __ LoadP(r3, MemOperand(sp, kLastMatchInfoOffset));
-  __ JumpIfSmi(r3, &runtime);
-  __ CompareObjectType(r3, r5, r5, JS_OBJECT_TYPE);
-  __ bne(&runtime);
+  // Check that the last match info is a FixedArray.
+  __ LoadP(last_match_info_elements, MemOperand(sp, kLastMatchInfoOffset));
+  __ JumpIfSmi(last_match_info_elements, &runtime);
   // Check that the object has fast elements.
-  __ LoadP(last_match_info_elements,
-           FieldMemOperand(r3, JSArray::kElementsOffset));
   __ LoadP(r3,
            FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
   __ CompareRoot(r3, Heap::kFixedArrayMapRootIndex);
   __ bne(&runtime);
   // Check that the last match info has space for the capture registers and the
   // additional information.
   __ LoadP(
       r3, FieldMemOperand(last_match_info_elements, FixedArray::kLengthOffset));
-  __ addi(r5, r4, Operand(RegExpImpl::kLastMatchOverhead));
+  __ addi(r5, r4, Operand(RegExpMatchInfo::kLastMatchOverhead));
   __ SmiUntag(r0, r3);
   __ cmp(r5, r0);
   __ bgt(&runtime);
 
   // r4: number of capture registers
   // subject: subject string
   // Store the capture count.
   __ SmiTag(r5, r4);
   __ StoreP(r5, FieldMemOperand(last_match_info_elements,
-                                RegExpImpl::kLastCaptureCountOffset),
+                                RegExpMatchInfo::kNumberOfCapturesOffset),
             r0);
   // Store last subject and last input.
   __ StoreP(subject, FieldMemOperand(last_match_info_elements,
-                                     RegExpImpl::kLastSubjectOffset),
+                                     RegExpMatchInfo::kLastSubjectOffset),
             r0);
   __ mr(r5, subject);
-  __ RecordWriteField(last_match_info_elements, RegExpImpl::kLastSubjectOffset,
-                      subject, r10, kLRHasNotBeenSaved, kDontSaveFPRegs);
+  __ RecordWriteField(last_match_info_elements,
+                      RegExpMatchInfo::kLastSubjectOffset, subject, r10,
+                      kLRHasNotBeenSaved, kDontSaveFPRegs);
   __ mr(subject, r5);
   __ StoreP(subject, FieldMemOperand(last_match_info_elements,
-                                     RegExpImpl::kLastInputOffset),
+                                     RegExpMatchInfo::kLastInputOffset),
             r0);
-  __ RecordWriteField(last_match_info_elements, RegExpImpl::kLastInputOffset,
-                      subject, r10, kLRHasNotBeenSaved, kDontSaveFPRegs);
+  __ RecordWriteField(last_match_info_elements,
+                      RegExpMatchInfo::kLastInputOffset, subject, r10,
+                      kLRHasNotBeenSaved, kDontSaveFPRegs);
 
   // Get the static offsets vector filled by the native regexp code.
   ExternalReference address_of_static_offsets_vector =
       ExternalReference::address_of_static_offsets_vector(isolate());
   __ mov(r5, Operand(address_of_static_offsets_vector));
 
   // r4: number of capture registers
   // r5: offsets vector
   Label next_capture;
   // Capture register counter starts from number of capture registers and
-  // counts down until wraping after zero.
-  __ addi(
-      r3, last_match_info_elements,
-      Operand(RegExpImpl::kFirstCaptureOffset - kHeapObjectTag - kPointerSize));
+  // counts down until wrapping after zero.
+  __ addi(r3, last_match_info_elements,
+          Operand(RegExpMatchInfo::kFirstCaptureOffset - kHeapObjectTag -
+                  kPointerSize));
   __ addi(r5, r5, Operand(-kIntSize));  // bias down for lwzu
   __ mtctr(r4);
   __ bind(&next_capture);
   // Read the value from the static offsets vector buffer.
   __ lwzu(r6, MemOperand(r5, kIntSize));
   // Store the smi value in the last match info.
   __ SmiTag(r6);
   __ StorePU(r6, MemOperand(r3, kPointerSize));
   __ bdnz(&next_capture);
 
   // Return last match info.
-  __ LoadP(r3, MemOperand(sp, kLastMatchInfoOffset));
+  __ mr(r3, last_match_info_elements);
   __ addi(sp, sp, Operand(4 * kPointerSize));
   __ Ret();
 
   // Do the runtime call to execute the regexp.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kRegExpExec);
 
   // Deferred code for string handling.
   // (5) Long external string? If not, go to (7).
   __ bind(&not_seq_nor_cons);
@@ skipping 3250 matching lines @@
       fp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC