v8/test/mjsunit/compiler/try-deopt.js

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

function DeoptFromTry(x) {
  try {
    %DeoptimizeFunction(DeoptFromTry);
    throw x;
  } catch (e) {
    return e + 1;
  }
  return x + 2;
}
%PrepareFunctionForOptimization(DeoptFromTry);
%OptimizeFunctionOnNextCall(DeoptFromTry);
assertEquals(24, DeoptFromTry(23));


function DeoptFromCatch(x) {
  try {
    throw x;
  } catch (e) {
    %DeoptimizeFunction(DeoptFromCatch);
    return e + 1;
  }
  return x + 2;
}
%PrepareFunctionForOptimization(DeoptFromCatch);
%OptimizeFunctionOnNextCall(DeoptFromCatch);
assertEquals(24, DeoptFromCatch(23));


function DeoptFromFinally_Return(x) {
  try {
    throw x;
  } finally {
    %DeoptimizeFunction(DeoptFromFinally_Return);
    return x + 1;
  }
  return x + 2;
}
%PrepareFunctionForOptimization(DeoptFromFinally_Return);
%OptimizeFunctionOnNextCall(DeoptFromFinally_Return);
assertEquals(24, DeoptFromFinally_Return(23));


function DeoptFromFinally_ReThrow(x) {
  try {
    throw x;
  } finally {
    %DeoptimizeFunction(DeoptFromFinally_ReThrow);
  }
  return x + 2;
}
%PrepareFunctionForOptimization(DeoptFromFinally_ReThrow);
%OptimizeFunctionOnNextCall(DeoptFromFinally_ReThrow);
assertThrows("DeoptFromFinally_ReThrow(new Error)", Error);