1/*
2 * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 7157626 8001112
27 * @summary Test major version for all legal combinations for -source and -target
28 * @author sgoel
29 *
30 * @modules jdk.compiler
31 */
32
33import java.io.*;
34import java.nio.*;
35import java.util.*;
36import java.util.regex.*;
37
38public class ClassVersionChecker {
39
40    int errors;
41    String[] jdk = {"", "1.6", "1.7", "1.8", "1.9"};
42    File javaFile = null;
43
44    public static void main(String[] args) throws Throwable {
45        new ClassVersionChecker().run();
46    }
47
48    void run() throws Exception {
49        writeTestFile();
50        /* Rules applicable for -source and -target combinations
51         * 1. If both empty, version num is for the current release
52         * 2. If source is not empty and target is empty, version is based on source
53         * 3. If both non-empty, version is based on target
54         */
55
56        /* -source (0=>empty,1=>1.2,...) X -target (0=>empty,1=>1.2,...)
57         * ver[0][0] => no -source or -target was given
58         * -1 => invalid combinations
59         */
60        int[][] ver =
61                {{53, -1, -1, -1, -1},
62                 {53, 50, 51, 52, 53},
63                 {53, -1, 51, 52, 53},
64                 {53, -1, -1, 52, 53}};
65
66        // Loop to run all possible combinations of source/target values
67        for (int i = 0; i< ver.length; i++) {
68            for (int j = 0 ; j< ver[i].length; j++) {
69                if(ver[i][j] != -1) {
70                    logMsg("Index values for i = " + i + " j = " + j);
71                    logMsg("Running for src = " + jdk[i] + " target = "+jdk[j] +" expected = " + ver[i][j]);
72                    test(i,j, ver[i][j]);
73                }
74            }
75        }
76
77        if (errors > 0)
78            throw new Exception(errors + " errors found");
79    }
80
81    void test (int i, int j, int expected) {
82        File classFile = compileTestFile(i, j, javaFile);
83        short majorVer = getMajorVersion(classFile);
84        checkVersion(majorVer, expected);
85    }
86
87    void writeTestFile() throws IOException {
88        javaFile = new File("Test.java");
89        try(PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(javaFile)));) {
90            out.println("class Test { ");
91            out.println("  public void foo() { }");
92            out.println("}");
93        } catch (IOException ioe) {
94            error("IOException while creating Test.java" + ioe);
95        }
96    }
97
98    File compileTestFile(int i , int j, File f) {
99        int rc = -1;
100        // Src and target are empty
101        if (i == 0 && j == 0 ) {
102            rc = compile("-g", f.getPath());
103        } else if( j == 0 ) {  // target is empty
104            rc = compile("-source", jdk[i], "-g", f.getPath());
105        } else {
106            rc = compile("-source", jdk[i], "-target", jdk[j], "-g", f.getPath());
107        }
108        if (rc != 0)
109            throw new Error("compilation failed. rc=" + rc);
110        String path = f.getPath();
111        return new File(path.substring(0, path.length() - 5) + ".class");
112    }
113
114    int compile(String... args) {
115        return com.sun.tools.javac.Main.compile(args);
116    }
117
118    void logMsg (String str) {
119        System.out.println(str);
120    }
121
122    short getMajorVersion(File f) {
123        List<String> args = new ArrayList<String>();
124        short majorVer = 0;
125        try(DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(f)));) {
126            in.readInt();
127            in.readShort();
128            majorVer = in.readShort();
129            System.out.println("major version:" +  majorVer);
130        } catch (IOException e) {
131            error("IOException while reading Test.class" + e);
132        }
133        return majorVer;
134    }
135
136    void checkVersion(short majorVer, int expected) {
137        if (majorVer != expected ) {
138            error("versions did not match, Expected: " + expected + "Got: " + majorVer);
139        }
140    }
141
142    void error(String msg) {
143       System.out.println("error: " + msg);
144       errors++;
145    }
146}
147