Revert of [regexp] Remove remainder of native RegExpExecStub

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 1196 matching lines @@
 
   // Restore callee-saved registers.
   __ MultiPop(kCalleeSaved);
 
   // Return
   __ LoadP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
   __ mtlr(r0);
   __ blr();
 }
 
+void RegExpExecStub::Generate(MacroAssembler* masm) {
+#ifdef V8_INTERPRETED_REGEXP
+  // This case is handled prior to the RegExpExecStub call.
+  __ Abort(kUnexpectedRegExpExecCall);
+#else  // V8_INTERPRETED_REGEXP
+  // Isolates: note we add an additional parameter here (isolate pointer).
+  const int kRegExpExecuteArguments = 10;
+  const int kParameterRegisters = 8;
+  __ EnterExitFrame(false, kRegExpExecuteArguments - kParameterRegisters);
+
+  // Stack pointer now points to cell where return address is to be written.
+  // Arguments are before that on the stack or in registers.
+
+  // Argument 10 (in stack parameter area): Pass current isolate address.
+  __ mov(r11, Operand(ExternalReference::isolate_address(isolate())));
+  __ StoreP(r11,
+            MemOperand(sp, (kStackFrameExtraParamSlot + 1) * kPointerSize));
+
+  // Argument 9 is a dummy that reserves the space used for
+  // the return address added by the ExitFrame in native calls.
+
+  // Argument 8 (r10): Indicate that this is a direct call from JavaScript.
+  __ li(r10, Operand(1));
+
+  // Argument 7 (r9): Start (high end) of backtracking stack memory area.
+  ExternalReference address_of_regexp_stack_memory_address =
+      ExternalReference::address_of_regexp_stack_memory_address(isolate());
+  ExternalReference address_of_regexp_stack_memory_size =
+      ExternalReference::address_of_regexp_stack_memory_size(isolate());
+  __ mov(r11, Operand(address_of_regexp_stack_memory_address));
+  __ LoadP(r11, MemOperand(r11, 0));
+  __ mov(ip, Operand(address_of_regexp_stack_memory_size));
+  __ LoadP(ip, MemOperand(ip, 0));
+  __ add(r9, r11, ip);
+
+  // Argument 6 (r8): Set the number of capture registers to zero to force
+  // global egexps to behave as non-global.  This does not affect non-global
+  // regexps.
+  __ li(r8, Operand::Zero());
+
+  // Argument 5 (r7): static offsets vector buffer.
+  __ mov(
+      r7,
+      Operand(ExternalReference::address_of_static_offsets_vector(isolate())));
+
+  // Argument 4, r6: End of string data
+  // Argument 3, r5: Start of string data
+  CHECK(r6.is(RegExpExecDescriptor::StringEndRegister()));
+  CHECK(r5.is(RegExpExecDescriptor::StringStartRegister()));
+
+  // Argument 2 (r4): Previous index.
+  CHECK(r4.is(RegExpExecDescriptor::LastIndexRegister()));
+
+  // Argument 1 (r3): Subject string.
+  CHECK(r3.is(RegExpExecDescriptor::StringRegister()));
+
+  // Locate the code entry and call it.
+  Register code_reg = RegExpExecDescriptor::CodeRegister();
+  __ addi(code_reg, code_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+  DirectCEntryStub stub(isolate());
+  stub.GenerateCall(masm, code_reg);
+
+  __ LeaveExitFrame(false, no_reg, true);
+
+  // Return the smi-tagged result.
+  __ SmiTag(r3);
+  __ Ret();
+#endif  // V8_INTERPRETED_REGEXP
+}
+
 
 static void CallStubInRecordCallTarget(MacroAssembler* masm, CodeStub* stub) {
   // r3 : number of arguments to the construct function
   // r4 : the function to call
   // r5 : feedback vector
   // r6 : slot in feedback vector (Smi)
   FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
 
   // Number-of-arguments register must be smi-tagged to call out.
   __ SmiTag(r3);
@@ skipping 1878 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