Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/ia32/macro-assembler-ia32.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 337 matching lines @@
 
 void MacroAssembler::LeaveFrame(StackFrame::Type type) {
   if (FLAG_debug_code) {
     cmp(Operand(ebp, StandardFrameConstants::kMarkerOffset),
         Immediate(Smi::FromInt(type)));
     Check(equal, "stack frame types must match");
   }
   leave();
 }
 
-
-void MacroAssembler::EnterExitFrame(StackFrame::Type type) {
-  ASSERT(type == StackFrame::EXIT || type == StackFrame::EXIT_DEBUG);
-
+void MacroAssembler::EnterExitFramePrologue(ExitFrame::Mode mode) {
   // Setup the frame structure on the stack.
   ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerFPOffset ==  0 * kPointerSize);
   push(ebp);
   mov(ebp, Operand(esp));
 
   // Reserve room for entry stack pointer and push the debug marker.
   ASSERT(ExitFrameConstants::kSPOffset  == -1 * kPointerSize);
   push(Immediate(0));  // saved entry sp, patched before call
-  push(Immediate(type == StackFrame::EXIT_DEBUG ? 1 : 0));
+  if (mode == ExitFrame::MODE_DEBUG) {
+    push(Immediate(0));
+  } else {
+    push(Immediate(CodeObject()));
+  }
 
   // Save the frame pointer and the context in top.
   ExternalReference c_entry_fp_address(Top::k_c_entry_fp_address);
   ExternalReference context_address(Top::k_context_address);
   mov(Operand::StaticVariable(c_entry_fp_address), ebp);
   mov(Operand::StaticVariable(context_address), esi);
+}
 
-  // Setup argc and argv in callee-saved registers.
-  int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
-  mov(edi, Operand(eax));
-  lea(esi, Operand(ebp, eax, times_4, offset));
-
+void MacroAssembler::EnterExitFrameEpilogue(ExitFrame::Mode mode, int argc) {
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Save the state of all registers to the stack from the memory
   // location. This is needed to allow nested break points.
-  if (type == StackFrame::EXIT_DEBUG) {
+  if (mode == ExitFrame::MODE_DEBUG) {
     // TODO(1243899): This should be symmetric to
     // CopyRegistersFromStackToMemory() but it isn't! esp is assumed
     // correct here, but computed for the other call. Very error
     // prone! FIX THIS.  Actually there are deeper problems with
     // register saving than this asymmetry (see the bug report
     // associated with this issue).
     PushRegistersFromMemory(kJSCallerSaved);
   }
 #endif
 
-  // Reserve space for two arguments: argc and argv.
-  sub(Operand(esp), Immediate(2 * kPointerSize));
+  // Reserve space for arguments.
+  sub(Operand(esp), Immediate(argc * kPointerSize));
 
   // Get the required frame alignment for the OS.
   static const int kFrameAlignment = OS::ActivationFrameAlignment();
   if (kFrameAlignment > 0) {
     ASSERT(IsPowerOf2(kFrameAlignment));
     and_(esp, -kFrameAlignment);
   }
 
   // Patch the saved entry sp.
   mov(Operand(ebp, ExitFrameConstants::kSPOffset), esp);
 }
 
 
-void MacroAssembler::LeaveExitFrame(StackFrame::Type type) {
+void MacroAssembler::EnterExitFrame(ExitFrame::Mode mode) {
+  EnterExitFramePrologue(mode);
+
+  // Setup argc and argv in callee-saved registers.
+  int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
+  mov(edi, Operand(eax));
+  lea(esi, Operand(ebp, eax, times_4, offset));
+
+  EnterExitFrameEpilogue(mode, 2);
+}
+
+
+void MacroAssembler::EnterApiExitFrame(ExitFrame::Mode mode,
+                                       int stack_space,
+                                       int argc) {
+  EnterExitFramePrologue(mode);
+
+  int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
+  lea(esi, Operand(ebp, (stack_space * kPointerSize) + offset));
+
+  EnterExitFrameEpilogue(mode, argc);
+}
+
+
+void MacroAssembler::LeaveExitFrame(ExitFrame::Mode mode) {
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Restore the memory copy of the registers by digging them out from
   // the stack. This is needed to allow nested break points.
-  if (type == StackFrame::EXIT_DEBUG) {
+  if (mode == ExitFrame::MODE_DEBUG) {
     // It's okay to clobber register ebx below because we don't need
     // the function pointer after this.
     const int kCallerSavedSize = kNumJSCallerSaved * kPointerSize;
-    int kOffset = ExitFrameConstants::kDebugMarkOffset - kCallerSavedSize;
+    int kOffset = ExitFrameConstants::kCodeOffset - kCallerSavedSize;
     lea(ebx, Operand(ebp, kOffset));
     CopyRegistersFromStackToMemory(ebx, ecx, kJSCallerSaved);
   }
 #endif
 
   // Get the return address from the stack and restore the frame pointer.
   mov(ecx, Operand(ebp, 1 * kPointerSize));
   mov(ebp, Operand(ebp, 0 * kPointerSize));
 
   // Pop the arguments and the receiver from the caller stack.
@@ skipping 491 matching lines @@
                                      int result_size) {
   // TODO(1236192): Most runtime routines don't need the number of
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
   Set(eax, Immediate(num_arguments));
   JumpToRuntime(ext);
 }
 
 
+void MacroAssembler::PushHandleScope(Register scratch) {
+  // Push the number of extensions, smi-tagged so the gc will ignore it.
+  ExternalReference extensions_address =
+      ExternalReference::handle_scope_extensions_address();
+  mov(scratch, Operand::StaticVariable(extensions_address));
+  ASSERT_EQ(0, kSmiTag);
+  shl(scratch, kSmiTagSize);
+  push(scratch);
+  mov(Operand::StaticVariable(extensions_address), Immediate(0));
+  // Push next and limit pointers which will be wordsize aligned and
+  // hence automatically smi tagged.
+  ExternalReference next_address =
+      ExternalReference::handle_scope_next_address();
+  push(Operand::StaticVariable(next_address));
+  ExternalReference limit_address =
+      ExternalReference::handle_scope_limit_address();
+  push(Operand::StaticVariable(limit_address));
+}
+
+
+void MacroAssembler::PopHandleScope(Register scratch) {
+  ExternalReference extensions_address =
+        ExternalReference::handle_scope_extensions_address();
+  Label write_back;
+  mov(scratch, Operand::StaticVariable(extensions_address));
+  cmp(Operand(scratch), Immediate(0));
+  j(equal, &write_back);
+  CallRuntime(Runtime::kDeleteHandleScopeExtensions, 0);
+
+  bind(&write_back);
+  ExternalReference limit_address =
+        ExternalReference::handle_scope_limit_address();
+  pop(Operand::StaticVariable(limit_address));
+  ExternalReference next_address =
+        ExternalReference::handle_scope_next_address();
+  pop(Operand::StaticVariable(next_address));
+  pop(scratch);
+  shr(scratch, kSmiTagSize);
+  mov(Operand::StaticVariable(extensions_address), scratch);
+}
+
+
 void MacroAssembler::JumpToRuntime(const ExternalReference& ext) {
   // Set the entry point and jump to the C entry runtime stub.
   mov(ebx, Immediate(ext));
   CEntryStub ces(1);
   jmp(ces.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
 void MacroAssembler::InvokePrologue(const ParameterCount& expected,
                                     const ParameterCount& actual,
@@ skipping 261 matching lines @@
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 
 } }  // namespace v8::internal