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Add regression test for exponential complexity of recursive imports

This commit is contained in:
Sam Harwell 2014-09-25 20:57:37 -05:00
parent 7f577d9209
commit 9d6a6bd3a8
1 changed files with 32 additions and 0 deletions
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32
tool/test/org/antlr/v4/test/TestPerformance.java
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@ -1998,4 +1998,36 @@ public class TestPerformance extends BaseTest {
Assert.assertEquals("", found);
Assert.assertEquals(null, stderrDuringParse);
}
@Test(timeout = 20000)
public void testExponentialInclude() {
String grammarFormat =
"parser grammar Level_%d_%d;\n" +
"\n" +
"%s import Level_%d_1, Level_%d_2;\n" +
"\n" +
"rule_%d_%d : EOF;\n";
System.out.println("dir "+tmpdir);
mkdir(tmpdir);
long startTime = System.nanoTime();
int levels = 20;
for (int level = 0; level < levels; level++) {
String leafPrefix = level == levels - 1 ? "//" : "";
String grammar1 = String.format(grammarFormat, level, 1, leafPrefix, level + 1, level + 1, level, 1);
writeFile(tmpdir, "Level_" + level + "_1.g4", grammar1);
if (level > 0) {
String grammar2 = String.format(grammarFormat, level, 2, leafPrefix, level + 1, level + 1, level, 1);
writeFile(tmpdir, "Level_" + level + "_2.g4", grammar2);
}
}
ErrorQueue equeue = antlr("Level_0_1.g4", false);
Assert.assertTrue(equeue.errors.isEmpty());
long endTime = System.nanoTime();
System.out.format("%s milliseconds.%n", (endTime - startTime) / 1000000.0);
}
}