import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStreamReader;

import java.util.regex.Pattern;

import com.oracle.java.testlibrary.OutputAnalyzer;

import com.oracle.java.testlibrary.Platform;

import com.oracle.java.testlibrary.ProcessTools;

/*

 * @test

 * @bug 8065896

 * @summary Synchronous signals during error reporting may terminate or hang VM process

 * @library /testlibrary

 * @author Thomas Stuefe (SAP)

 */

public class SecondaryErrorTest {

  public static void main(String[] args) throws Exception {

    // Do not execute for windows, nor for non-debug builds

    if (Platform.isWindows()) {

      return;

    }

    if (!Platform.isDebugBuild()) {

      return;

    }

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

        "-XX:+UnlockDiagnosticVMOptions",

        "-Xmx100M",

        "-XX:ErrorHandlerTest=15",

        "-XX:TestCrashInErrorHandler=14",

        "-version");

    OutputAnalyzer output_detail = new OutputAnalyzer(pb.start());

    // we should have crashed with a SIGFPE

    output_detail.shouldMatch("# A fatal error has been detected by the Java Runtime Environment:.*");

    output_detail.shouldMatch("# +SIGFPE.*");

    // extract hs-err file

    String hs_err_file = output_detail.firstMatch("# *(\\S*hs_err_pid\\d+\\.log)", 1);

    if (hs_err_file == null) {

      throw new RuntimeException("Did not find hs-err file in output.\n");

    }

    // scan hs-err file: File should contain the "[error occurred during error reporting..]"

    // markers which show that the secondary error handling kicked in and handled the

    // error successfully. As an added test, we check that the last line contains "END.",

    // which is an end marker written in the last step and proves that hs-err file was

    // completely written.

    File f = new File(hs_err_file);

    if (!f.exists()) {

      throw new RuntimeException("hs-err file missing at "

          + f.getAbsolutePath() + ".\n");

    }

    System.out.println("Found hs_err file. Scanning...");

    FileInputStream fis = new FileInputStream(f);

    BufferedReader br = new BufferedReader(new InputStreamReader(fis));

    String line = null;

    Pattern [] pattern = new Pattern[] {

        Pattern.compile("Will crash now \\(TestCrashInErrorHandler=14\\)..."),

        Pattern.compile("\\[error occurred during error reporting \\(test secondary crash 1\\).*\\]"),

        Pattern.compile("Will crash now \\(TestCrashInErrorHandler=14\\)..."),

        Pattern.compile("\\[error occurred during error reporting \\(test secondary crash 2\\).*\\]"),

    };

    int currentPattern = 0;

    String lastLine = null;

    while ((line = br.readLine()) != null) {

      if (currentPattern < pattern.length) {

        if (pattern[currentPattern].matcher(line).matches()) {

          System.out.println("Found: " + line + ".");

          currentPattern ++;

        }

      }

      lastLine = line;

    }

    br.close();

    if (currentPattern < pattern.length) {

      throw new RuntimeException("hs-err file incomplete (first missing pattern: " +  currentPattern + ")");

    }

    if (!lastLine.equals("END.")) {

      throw new RuntimeException("hs-err file incomplete (missing END marker.)");

    } else {

      System.out.println("End marker found.");

    }

    System.out.println("OK.");

  }

}