Thu, 08 Aug 2013 11:49:16 +0100
8019486: javac, generates erroneous LVT for a test case with lambda code
Reviewed-by: mcimadamore
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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15 * accompanied this code).
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24 */
26 /*
27 * @test
28 * @bug 8019486
29 * @summary javac, generates erroneous LVT for a test case with lambda code
30 * @library /tools/javac/lib
31 * @build ToolBox
32 * @run main WrongLVTForLambdaTest
33 */
35 import java.io.File;
36 import java.nio.file.Paths;
38 import com.sun.tools.classfile.ClassFile;
39 import com.sun.tools.classfile.Code_attribute;
40 import com.sun.tools.classfile.LineNumberTable_attribute;
41 import com.sun.tools.classfile.Method;
42 import com.sun.tools.javac.util.Assert;
44 public class WrongLVTForLambdaTest {
46 static final String testSource =
47 /* 01 */ "import java.util.List;\n" +
48 /* 02 */ "import java.util.Arrays;\n" +
49 /* 03 */ "import java.util.stream.Collectors;\n" +
50 /* 04 */ "\n" +
51 /* 05 */ "public class Foo {\n" +
52 /* 06 */ " void bar(int value) {\n" +
53 /* 07 */ " final List<Integer> numbers = Arrays.asList(1, 2, 3);\n" +
54 /* 08 */ " final List<Integer> numbersPlusOne = \n" +
55 /* 09 */ " numbers.stream().map(number -> number / 1).collect(Collectors.toList());\n" +
56 /* 10 */ " }\n" +
57 /* 11 */ "}";
59 static final int[][] expectedLNT = {
60 // {line-number, start-pc},
61 {9, 0}, //number -> number / 1
62 };
64 static final String methodToLookFor = "lambda$0";
66 public static void main(String[] args) throws Exception {
67 new WrongLVTForLambdaTest().run();
68 }
70 void run() throws Exception {
71 compileTestClass();
72 checkClassFile(new File(Paths.get(System.getProperty("user.dir"),
73 "Foo.class").toUri()), methodToLookFor);
74 }
76 void compileTestClass() throws Exception {
77 ToolBox.JavaToolArgs javacSuccessArgs =
78 new ToolBox.JavaToolArgs().setSources(testSource);
79 ToolBox.javac(javacSuccessArgs);
80 }
82 void checkClassFile(final File cfile, String methodToFind) throws Exception {
83 ClassFile classFile = ClassFile.read(cfile);
84 boolean methodFound = false;
85 for (Method method : classFile.methods) {
86 if (method.getName(classFile.constant_pool).equals(methodToFind)) {
87 methodFound = true;
88 Code_attribute code = (Code_attribute) method.attributes.get("Code");
89 LineNumberTable_attribute lnt =
90 (LineNumberTable_attribute) code.attributes.get("LineNumberTable");
91 Assert.check(lnt.line_number_table_length == expectedLNT.length,
92 "The LineNumberTable found has a length different to the expected one");
93 int i = 0;
94 for (LineNumberTable_attribute.Entry entry: lnt.line_number_table) {
95 Assert.check(entry.line_number == expectedLNT[i][0] &&
96 entry.start_pc == expectedLNT[i][1],
97 "LNT entry at pos " + i + " differ from expected." +
98 "Found " + entry.line_number + ":" + entry.start_pc +
99 ". Expected " + expectedLNT[i][0] + ":" + expectedLNT[i][1]);
100 i++;
101 }
102 }
103 }
104 Assert.check(methodFound, "The seek method was not found");
105 }
107 void error(String msg) {
108 throw new AssertionError(msg);
109 }
111 }