Revert of [regexp] Remove remainder of native RegExpExecStub

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index 8b6fbadcb920e31ed9a93c124cd5fad73622fbb8..4ec7a45926cea302fa4af259371bdd675537ea69 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -279,6 +279,69 @@
   }
   // Return value is in st(0) on ia32.
   __ ret(0);
+}
+
+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).
+  static const int kRegExpExecuteArguments = 9;
+  __ EnterApiExitFrame(kRegExpExecuteArguments);
+
+  // Argument 9: Pass current isolate address.
+  __ mov(Operand(esp, 8 * kPointerSize),
+      Immediate(ExternalReference::isolate_address(isolate())));
+
+  // Argument 8: Indicate that this is a direct call from JavaScript.
+  __ mov(Operand(esp, 7 * kPointerSize), Immediate(1));
+
+  // Argument 7: 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(esi, Operand::StaticVariable(address_of_regexp_stack_memory_address));
+  __ add(esi, Operand::StaticVariable(address_of_regexp_stack_memory_size));
+  __ mov(Operand(esp, 6 * kPointerSize), esi);
+
+  // Argument 6: Set the number of capture registers to zero to force global
+  // regexps to behave as non-global.  This does not affect non-global regexps.
+  __ mov(Operand(esp, 5 * kPointerSize), Immediate(0));
+
+  // Argument 5: static offsets vector buffer.
+  __ mov(Operand(esp, 4 * kPointerSize),
+         Immediate(ExternalReference::address_of_static_offsets_vector(
+             isolate())));
+
+  // Argument 4: End of string data
+  // Argument 3: Start of string data
+  __ mov(Operand(esp, 3 * kPointerSize),
+         RegExpExecDescriptor::StringEndRegister());
+  __ mov(Operand(esp, 2 * kPointerSize),
+         RegExpExecDescriptor::StringStartRegister());
+
+  // Argument 2: Previous index.
+  __ mov(Operand(esp, 1 * kPointerSize),
+         RegExpExecDescriptor::LastIndexRegister());
+
+  // Argument 1: Original subject string.
+  __ mov(Operand(esp, 0 * kPointerSize),
+         RegExpExecDescriptor::StringRegister());
+
+  // Locate the code entry and call it.
+  __ add(RegExpExecDescriptor::CodeRegister(),
+         Immediate(Code::kHeaderSize - kHeapObjectTag));
+  __ call(RegExpExecDescriptor::CodeRegister());
+
+  // Drop arguments and come back to JS mode.
+  __ LeaveApiExitFrame(true);
+
+  // TODO(jgruber): Don't tag return value once this is supported by stubs.
+  __ SmiTag(eax);
+  __ ret(0 * kPointerSize);
+#endif  // V8_INTERPRETED_REGEXP
 }