PPC: [Interpreter] Add basic deoptimization support from TurboFan to Ignition.

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index e5ef3188413605a7495ebbb4f6c5e5d5b01a1816..5817e8cb2ed296651f5ba12d6a65ad5c0cc4be6d 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -931,6 +931,90 @@ void Builtins::Generate_InterpreterPushArgsAndConstruct(MacroAssembler* masm) {
 }
 
 
+static void Generate_InterpreterNotifyDeoptimizedHelper(
+    MacroAssembler* masm, Deoptimizer::BailoutType type) {
+  // Enter an internal frame.
+  {
+    FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+    // Save accumulator register and pass the deoptimization type to
+    // the runtime system.
+    __ LoadSmiLiteral(r4, Smi::FromInt(static_cast<int>(type)));
+    __ Push(kInterpreterAccumulatorRegister, r4);
+    __ CallRuntime(Runtime::kNotifyDeoptimized, 1);
+    __ pop(kInterpreterAccumulatorRegister);  // Restore accumulator register.
+    // Tear down internal frame.
+  }
+
+  // Drop state (we don't use these for interpreter deopts) and push PC at top
+  // of stack (to simulate initial call to bytecode handler in interpreter entry
+  // trampoline).
+  __ pop(r4);
+  __ StoreP(r4, MemOperand(sp, 0));
+
+  // Initialize register file register and dispatch table register.
+  __ addi(kInterpreterRegisterFileRegister, fp,
+          Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
+  __ LoadRoot(kInterpreterDispatchTableRegister,
+              Heap::kInterpreterTableRootIndex);
+  __ addi(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
+          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+
+  // Get the context from the frame.
+  // TODO(rmcilroy): Update interpreter frame to expect current context at the
+  // context slot instead of the function context.
+  __ LoadP(kContextRegister,
+           MemOperand(kInterpreterRegisterFileRegister,
+                      InterpreterFrameConstants::kContextFromRegisterPointer));
+
+  // Get the bytecode array pointer from the frame.
+  __ LoadP(r4,
+           MemOperand(kInterpreterRegisterFileRegister,
+                      InterpreterFrameConstants::kFunctionFromRegisterPointer));
+  __ LoadP(r4, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
+  __ LoadP(kInterpreterBytecodeArrayRegister,
+           FieldMemOperand(r4, SharedFunctionInfo::kFunctionDataOffset));
+
+  if (FLAG_debug_code) {
+    // Check function data field is actually a BytecodeArray object.
+    __ TestIfSmi(kInterpreterBytecodeArrayRegister, r0);
+    __ Assert(ne, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
+    __ CompareObjectType(kInterpreterBytecodeArrayRegister, r4, no_reg,
+                         BYTECODE_ARRAY_TYPE);
+    __ Assert(eq, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
+  }
+
+  // Get the target bytecode offset from the frame.
+  __ LoadP(kInterpreterBytecodeOffsetRegister,
+           MemOperand(
+               kInterpreterRegisterFileRegister,
+               InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer));
+  __ SmiUntag(kInterpreterBytecodeOffsetRegister);
+
+  // Dispatch to the target bytecode.
+  __ lbzx(r4, MemOperand(kInterpreterBytecodeArrayRegister,
+                         kInterpreterBytecodeOffsetRegister));
+  __ ShiftLeftImm(ip, r4, Operand(kPointerSizeLog2));
+  __ LoadPX(ip, MemOperand(kInterpreterDispatchTableRegister, ip));
+  __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ Jump(ip);
+}
+
+
+void Builtins::Generate_InterpreterNotifyDeoptimized(MacroAssembler* masm) {
+  Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
+}
+
+
+void Builtins::Generate_InterpreterNotifySoftDeoptimized(MacroAssembler* masm) {
+  Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
+}
+
+
+void Builtins::Generate_InterpreterNotifyLazyDeoptimized(MacroAssembler* masm) {
+  Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
+}
+
+
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   CallRuntimePassFunction(masm, Runtime::kCompileLazy);
   GenerateTailCallToReturnedCode(masm);