PPC: [interpreter] First implementation of stack unwinding.

Port 0b3066b8

Original commit message:
    This implements a first prototype of stack unwinding for interpreted
    frames. The unwinding machinery performs a range-based lookup in the
    given handler table and potentially continues dispatching at the handler
    offset. Note that this does not yet correctly restore the context to the
    correct value when the handler is being entered.

R=mstarzinger@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4674
LOG=n

Review URL: https://codereview.chromium.org/1612593002

Cr-Commit-Position: refs/heads/master@{#33418}

src/ppc/builtins-ppc.cc

@@ -1048,23 +1048,7 @@ 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);
-    __ pop(kInterpreterAccumulatorRegister);  // Restore accumulator register.
-    // Tear down internal frame.
-  }
-
-  // Drop state (we don't use these for interpreter deopts).
-  __ Drop(1);
-
+static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ addi(kInterpreterRegisterFileRegister, fp,
           Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
@@ -1114,6 +1098,28 @@ static void Generate_InterpreterNotifyDeoptimizedHelper(
 }
 
 
+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);
+    __ pop(kInterpreterAccumulatorRegister);  // Restore accumulator register.
+    // Tear down internal frame.
+  }
+
+  // Drop state (we don't use these for interpreter deopts).
+  __ Drop(1);
+
+  // Enter the bytecode dispatch.
+  Generate_EnterBytecodeDispatch(masm);
+}
+
+
 void Builtins::Generate_InterpreterNotifyDeoptimized(MacroAssembler* masm) {
   Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
 }
@@ -1129,6 +1135,11 @@ void Builtins::Generate_InterpreterNotifyLazyDeoptimized(MacroAssembler* masm) {
 }
 
 
+void Builtins::Generate_InterpreterEnterExceptionHandler(MacroAssembler* masm) {
+  Generate_EnterBytecodeDispatch(masm);
+}
+
+
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   CallRuntimePassFunction(masm, Runtime::kCompileLazy);
   GenerateTailCallToReturnedCode(masm);