MIPS: reland 16744: add context save for GenerateFastApiCall.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index a85b0d803441b655e287e14ff66abe16e4b4712d..465e8abc59f08d6f3dbc8051e23b8f0ec73a822c 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -3847,12 +3847,14 @@ static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
 }
 
 
-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;
@@ -3915,12 +3917,13 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   }
 
   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
@@ -3941,14 +3944,23 @@ void MacroAssembler::CallApiFunctionAndReturn(ExternalReference function,
   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);
@@ -4684,6 +4696,7 @@ void MacroAssembler::EnterExitFrame(bool save_doubles,
 
 void MacroAssembler::LeaveExitFrame(bool save_doubles,
                                     Register argument_count,
+                                    bool restore_context,
                                     bool do_return) {
   // Optionally restore all double registers.
   if (save_doubles) {
@@ -4700,9 +4713,12 @@ void MacroAssembler::LeaveExitFrame(bool save_doubles,
   sw(zero_reg, MemOperand(t8));
 
   // Restore current context from top and clear it in debug mode.
-  li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
-  lw(cp, MemOperand(t8));
+  if (restore_context) {
+    li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
+    lw(cp, MemOperand(t8));
+  }
 #ifdef DEBUG
+  li(t8, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
   sw(a3, MemOperand(t8));
 #endif