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100 lines
3.7 KiB
Java
100 lines
3.7 KiB
Java
/*
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* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8366138
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* @summary C2: jump_switch_ranges could cause stack overflow when compiling
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* huge switch statement with zero-count profiling data.
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* @library /test/lib /
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* @run main/othervm ${test.main.class}
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* @run main/othervm -Xbatch -XX:CompileOnly=Test::test -XX:-DontCompileHugeMethods -XX:CompilerThreadStackSize=512 ${test.main.class}
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* @run main/othervm -Xbatch -XX:CompileOnly=Test::test -XX:+DontCompileHugeMethods -XX:CompilerThreadStackSize=512 ${test.main.class}
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*/
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package compiler.c2;
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import java.util.stream.Stream;
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import compiler.lib.compile_framework.CompileFramework;
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import compiler.lib.template_framework.Template;
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import static compiler.lib.template_framework.Template.scope;
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public class TestSwitchStackOverflow {
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// Template method exceeds HugeMethodLimit, hence -XX:-DontCompileHugeMethods.
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// 5000 cases + CompilerThreadStackSize=512 reliably overflows without the fix.
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static final int NUM_CASES = 5000;
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// Generate a class with a large tableswitch method and a main that
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// triggers recompilation with zero-count profiling data:
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// Phase 1: warm up with default-only path -> C2 compiles
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// Phase 2: hit a case -> triggers unstable_if deopt
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// Phase 3: recompile with all counts zero (except the default case)
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static String generate() {
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var caseTemplate = Template.make("i", (Integer i) -> scope(
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"""
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case #i:
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return #i;
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"""
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));
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var test = Template.make(() -> scope(
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"""
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public class Test {
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static int test(int x) {
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switch (x) {
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""",
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Stream.iterate(0, i -> i + 1)
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.limit(NUM_CASES)
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.map(i -> caseTemplate.asToken(i))
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.toList(),
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"""
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default: return -1;
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}
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}
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public static void main(String[] args) {
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for (int i = 0; i < 10_000; i++) {
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test(-1);
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}
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test(42);
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for (int i = 0; i < 10_000; i++) {
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test(-1);
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}
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System.out.println("Done");
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}
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}
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"""
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));
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return test.render();
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}
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public static void main(String[] args) {
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CompileFramework comp = new CompileFramework();
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comp.addJavaSourceCode("Test", generate());
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comp.compile();
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comp.invoke("Test", "main", new Object[] { new String[0] });
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}
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}
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