MIPS: reland 16744: add context save for GenerateFastApiCall.

src/mips/macro-assembler-mips.cc

 // Copyright 2012 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 3829 matching lines @@
          stub->CompilingCallsToThisStubIsGCSafe(isolate()));
   Jump(stub->GetCode(isolate()), RelocInfo::CODE_TARGET);
 }
 
 
 static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
   return ref0.address() - ref1.address();
 }
 
 
-void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
-                                              Address function_address,
-                                              ExternalReference thunk_ref,
-                                              Register thunk_last_arg,
-                                              int stack_space,
-                                              int return_value_offset_from_fp) {
+void MacroAssembler::CallApiFunctionAndReturn(
+    ExternalReference function,
+    Address function_address,
+    ExternalReference thunk_ref,
+    Register thunk_last_arg,
+    int stack_space,
+    MemOperand return_value_operand,
+    MemOperand* context_restore_operand) {
   ExternalReference next_address =
       ExternalReference::handle_scope_next_address(isolate());
   const int kNextOffset = 0;
   const int kLimitOffset = AddressOffset(
       ExternalReference::handle_scope_limit_address(isolate()),
       next_address);
   const int kLevelOffset = AddressOffset(
       ExternalReference::handle_scope_level_address(isolate()),
       next_address);
 
@@ skipping 42 matching lines @@
   if (FLAG_log_timer_events) {
     FrameScope frame(this, StackFrame::MANUAL);
     PushSafepointRegisters();
     PrepareCallCFunction(1, a0);
     li(a0, Operand(ExternalReference::isolate_address(isolate())));
     CallCFunction(ExternalReference::log_leave_external_function(isolate()), 1);
     PopSafepointRegisters();
   }
 
   Label promote_scheduled_exception;
+  Label exception_handled;
   Label delete_allocated_handles;
   Label leave_exit_frame;
   Label return_value_loaded;
 
   // Load value from ReturnValue.
-  lw(v0, MemOperand(fp, return_value_offset_from_fp*kPointerSize));
+  lw(v0, return_value_operand);
   bind(&return_value_loaded);
 
   // No more valid handles (the result handle was the last one). Restore
   // previous handle scope.
   sw(s0, MemOperand(s3, kNextOffset));
   if (emit_debug_code()) {
     lw(a1, MemOperand(s3, kLevelOffset));
     Check(eq, kUnexpectedLevelAfterReturnFromApiCall, a1, Operand(s2));
   }
   Subu(s2, s2, Operand(1));
   sw(s2, MemOperand(s3, kLevelOffset));
   lw(at, MemOperand(s3, kLimitOffset));
   Branch(&delete_allocated_handles, ne, s1, Operand(at));
 
   // Check if the function scheduled an exception.
   bind(&leave_exit_frame);
   LoadRoot(t0, Heap::kTheHoleValueRootIndex);
   li(at, Operand(ExternalReference::scheduled_exception_address(isolate())));
   lw(t1, MemOperand(at));
   Branch(&promote_scheduled_exception, ne, t0, Operand(t1));
+  bind(&exception_handled);
+
+  bool restore_context = context_restore_operand != NULL;
+  if (restore_context) {
+    lw(cp, *context_restore_operand);
+  }
   li(s0, Operand(stack_space));
-  LeaveExitFrame(false, s0, true);
+  LeaveExitFrame(false, s0, !restore_context, EMIT_RETURN);
 
   bind(&promote_scheduled_exception);
-  TailCallExternalReference(
-      ExternalReference(Runtime::kPromoteScheduledException, isolate()),
-      0,
-      1);
+  {
+    FrameScope frame(this, StackFrame::INTERNAL);
+    CallExternalReference(
+        ExternalReference(Runtime::kPromoteScheduledException, isolate()),
+        0);
+  }
+  jmp(&exception_handled);
 
   // HandleScope limit has changed. Delete allocated extensions.
   bind(&delete_allocated_handles);
   sw(s1, MemOperand(s3, kLimitOffset));
   mov(s0, v0);
   mov(a0, v0);
   PrepareCallCFunction(1, s1);
   li(a0, Operand(ExternalReference::isolate_address(isolate())));
   CallCFunction(ExternalReference::delete_handle_scope_extensions(isolate()),
       1);
@@ skipping 715 matching lines @@
 
   // Set the exit frame sp value to point just before the return address
   // location.
   addiu(at, sp, kPointerSize);
   sw(at, MemOperand(fp, ExitFrameConstants::kSPOffset));
 }
 
 
 void MacroAssembler::LeaveExitFrame(bool save_doubles,
                                     Register argument_count,
+                                    bool restore_context,
                                     bool do_return) {
   // Optionally restore all double registers.
   if (save_doubles) {
     // Remember: we only need to restore every 2nd double FPU value.
     lw(t8, MemOperand(fp, ExitFrameConstants::kSPOffset));
     for (int i = 0; i < FPURegister::kMaxNumRegisters; i+=2) {
       FPURegister reg = FPURegister::from_code(i);
       ldc1(reg, MemOperand(t8, i  * kDoubleSize + kPointerSize));
     }
   }
 
   // Clear top frame.
   li(t8, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
   sw(zero_reg, MemOperand(t8));
 
   // Restore current context from top and clear it in debug mode.
+  if (restore_context) {
+    li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
+    lw(cp, MemOperand(t8));
+  }
+#ifdef DEBUG
   li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
-  lw(cp, MemOperand(t8));
-#ifdef DEBUG
   sw(a3, MemOperand(t8));
 #endif
 
   // Pop the arguments, restore registers, and return.
   mov(sp, fp);  // Respect ABI stack constraint.
   lw(fp, MemOperand(sp, ExitFrameConstants::kCallerFPOffset));
   lw(ra, MemOperand(sp, ExitFrameConstants::kCallerPCOffset));
 
   if (argument_count.is_valid()) {
     sll(t8, argument_count, kPointerSizeLog2);
@@ skipping 880 matching lines @@
        opcode == BGTZL);
   opcode = (cond == eq) ? BEQ : BNE;
   instr = (instr & ~kOpcodeMask) | opcode;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS