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7020499: Project Coin: improvements to try-with-resources desugaring

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Avoid unnecessary check for resource nullness if the resource is known to be non-null; put resource closing code in a method that is shared by multiple try-with-resources.

Reviewed-by: darcy, mcimadamore, vromero
This commit is contained in:
Jan Lahoda 2016-04-19 14:16:39 +02:00
parent 28ed819ae9
commit d6521300a0
6 changed files with 533 additions and 19 deletions
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105
langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Lower.java
View file

@ -86,6 +86,7 @@ public class Lower extends TreeTranslator {
private final TypeEnvs typeEnvs;
private final Name dollarAssertionsDisabled;
private final Name classDollar;
private final Name dollarCloseResource;
private final Types types;
private final boolean debugLower;
private final PkgInfo pkginfoOpt;
@ -109,6 +110,8 @@ public class Lower extends TreeTranslator {
fromString(target.syntheticNameChar() + "assertionsDisabled");
classDollar = names.
fromString("class" + target.syntheticNameChar());
dollarCloseResource = names.
fromString(target.syntheticNameChar() + "closeResource");
types = Types.instance(context);
Options options = Options.instance(context);
@ -1648,9 +1651,11 @@ public class Lower extends TreeTranslator {
ListBuffer<JCStatement> stats = new ListBuffer<>();
JCTree resource = resources.head;
JCExpression expr = null;
boolean resourceNonNull;
if (resource instanceof JCVariableDecl) {
JCVariableDecl var = (JCVariableDecl) resource;
expr = make.Ident(var.sym).setType(resource.type);
resourceNonNull = var.init != null && TreeInfo.skipParens(var.init).hasTag(NEWCLASS);
stats.add(var);
} else {
Assert.check(resource instanceof JCExpression);
@ -1665,6 +1670,7 @@ public class Lower extends TreeTranslator {
JCVariableDecl syntheticTwrVarDecl =
make.VarDef(syntheticTwrVar, (JCExpression)resource);
expr = (JCExpression)make.Ident(syntheticTwrVar);
resourceNonNull = TreeInfo.skipParens(resource).hasTag(NEWCLASS);
stats.add(syntheticTwrVarDecl);
}
@ -1694,7 +1700,7 @@ public class Lower extends TreeTranslator {
int oldPos = make.pos;
make.at(TreeInfo.endPos(block));
JCBlock finallyClause = makeTwrFinallyClause(primaryException, expr);
JCBlock finallyClause = makeTwrFinallyClause(primaryException, expr, resourceNonNull);
make.at(oldPos);
JCTry outerTry = make.Try(makeTwrBlock(resources.tail, block,
finallyCanCompleteNormally, depth + 1),
@ -1706,7 +1712,96 @@ public class Lower extends TreeTranslator {
return newBlock;
}
private JCBlock makeTwrFinallyClause(Symbol primaryException, JCExpression resource) {
/**If the estimated number of copies the close resource code in a single class is above this
* threshold, generate and use a method for the close resource code, leading to smaller code.
* As generating a method has overhead on its own, generating the method for cases below the
* threshold could lead to an increase in code size.
*/
public static final int USE_CLOSE_RESOURCE_METHOD_THRESHOLD = 4;
private JCBlock makeTwrFinallyClause(Symbol primaryException, JCExpression resource,
boolean resourceNonNull) {
MethodSymbol closeResource = (MethodSymbol)lookupSynthetic(dollarCloseResource,
currentClass.members());
if (closeResource == null && shouldUseCloseResourceMethod()) {
closeResource = new MethodSymbol(
PRIVATE | STATIC | SYNTHETIC,
dollarCloseResource,
new MethodType(
List.of(syms.throwableType, syms.autoCloseableType),
syms.voidType,
List.<Type>nil(),
syms.methodClass),
currentClass);
enterSynthetic(resource.pos(), closeResource, currentClass.members());
JCMethodDecl md = make.MethodDef(closeResource, null);
List<JCVariableDecl> params = md.getParameters();
md.body = make.Block(0, List.<JCStatement>of(makeTwrCloseStatement(params.get(0).sym,
make.Ident(params.get(1)))));
JCClassDecl currentClassDecl = classDef(currentClass);
currentClassDecl.defs = currentClassDecl.defs.prepend(md);
}
JCStatement closeStatement;
if (closeResource != null) {
//$closeResource(#primaryException, #resource)
closeStatement = make.Exec(make.Apply(List.<JCExpression>nil(),
make.Ident(closeResource),
List.of(make.Ident(primaryException),
resource)
).setType(syms.voidType));
} else {
closeStatement = makeTwrCloseStatement(primaryException, resource);
}
JCStatement finallyStatement;
if (resourceNonNull) {
finallyStatement = closeStatement;
} else {
// if (#resource != null) { $closeResource(...); }
finallyStatement = make.If(makeNonNullCheck(resource),
closeStatement,
null);
}
return make.Block(0L,
List.<JCStatement>of(finallyStatement));
}
//where:
private boolean shouldUseCloseResourceMethod() {
class TryFinder extends TreeScanner {
int closeCount;
@Override
public void visitTry(JCTry tree) {
boolean empty = tree.body.stats.isEmpty();
for (JCTree r : tree.resources) {
closeCount += empty ? 1 : 2;
empty = false; //with multiple resources, only the innermost try can be empty.
}
super.visitTry(tree);
}
@Override
public void scan(JCTree tree) {
if (useCloseResourceMethod())
return;
super.scan(tree);
}
boolean useCloseResourceMethod() {
return closeCount >= USE_CLOSE_RESOURCE_METHOD_THRESHOLD;
}
}
TryFinder tryFinder = new TryFinder();
tryFinder.scan(classDef(currentClass));
return tryFinder.useCloseResourceMethod();
}
private JCStatement makeTwrCloseStatement(Symbol primaryException, JCExpression resource) {
// primaryException.addSuppressed(catchException);
VarSymbol catchException =
new VarSymbol(SYNTHETIC, make.paramName(2),
@ -1731,11 +1826,7 @@ public class Lower extends TreeTranslator {
tryTree,
makeResourceCloseInvocation(resource));
// if (#resource != null) { if (primaryException ... }
return make.Block(0L,
List.<JCStatement>of(make.If(makeNonNullCheck(resource),
closeIfStatement,
null)));
return closeIfStatement;
}
private JCStatement makeResourceCloseInvocation(JCExpression resource) {

125
langtools/test/tools/javac/TryWithResources/TwrAvoidNullCheck.java Normal file
View file

@ -0,0 +1,125 @@
/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 7020499
* @summary Verify that try-with-resources desugaring is not generating unnecessary null checks
* @library /tools/lib
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.code
* jdk.compiler/com.sun.tools.javac.comp
* jdk.compiler/com.sun.tools.javac.main
* jdk.compiler/com.sun.tools.javac.tree
* jdk.compiler/com.sun.tools.javac.util
* @build toolbox.ToolBox toolbox.JavacTask TwrAvoidNullCheck
* @run main TwrAvoidNullCheck
*/
import java.io.IOException;
import java.util.Arrays;
import com.sun.source.util.JavacTask;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.comp.AttrContext;
import com.sun.tools.javac.comp.Env;
import com.sun.tools.javac.comp.Lower;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCBinary;
import com.sun.tools.javac.tree.TreeInfo;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.TreeScanner;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Context.Factory;
import com.sun.tools.javac.util.List;
import toolbox.ToolBox;
public class TwrAvoidNullCheck {
public static void main(String... args) throws IOException {
new TwrAvoidNullCheck().run();
}
void run() throws IOException {
run("new Test()", false);
run("null", true);
run("System.getProperty(\"test\") != null ? new Test() : null", true);
}
void run(String resourceSpecification, boolean expected) throws IOException {
String template = "public class Test implements AutoCloseable {\n" +
" void t() {\n" +
" try (Test resource = RESOURCE) { }\n" +
" }\n" +
" public void close() { }\n" +
"}\n";
String code = template.replace("RESOURCE", resourceSpecification);
Context ctx = new Context();
DumpLower.preRegister(ctx);
Iterable<ToolBox.JavaSource> files = Arrays.asList(new ToolBox.JavaSource(code));
JavacTask task = JavacTool.create().getTask(null, null, null, null, null, files, ctx);
task.call();
boolean hasNullCheck = ((DumpLower) DumpLower.instance(ctx)).hasNullCheck;
if (hasNullCheck != expected) {
throw new IllegalStateException("expected: " + expected +
"; actual: " + hasNullCheck +
"; code: " + code);
}
}
static class DumpLower extends Lower {
public static void preRegister(Context ctx) {
ctx.put(lowerKey, new Factory<Lower>() {
@Override
public Lower make(Context c) {
return new DumpLower(c);
}
});
}
public DumpLower(Context context) {
super(context);
}
boolean hasNullCheck;
@Override
public List<JCTree> translateTopLevelClass(Env<AttrContext> env, JCTree cdef, TreeMaker make) {
List<JCTree> result = super.translateTopLevelClass(env, cdef, make);
new TreeScanner() {
@Override
public void visitBinary(JCBinary tree) {
hasNullCheck |= tree.operator.getSimpleName().contentEquals("!=") &&
"resource".equals(String.valueOf(TreeInfo.name(tree.lhs))) &&
TreeInfo.isNull(tree.rhs);
super.visitBinary(tree);
}
}.scan(result);
return result;
}
}
}

140
langtools/test/tools/javac/TryWithResources/TwrClose.java Normal file
View file

@ -0,0 +1,140 @@
/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 7020499
* @summary Verify that the close resource code works properly in all cases
* @library /tools/lib
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.comp
* jdk.compiler/com.sun.tools.javac.main
* @build toolbox.ToolBox TwrClose
* @run main TwrClose
*/
import javax.tools.JavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
import com.sun.tools.javac.comp.Lower;
import toolbox.JavacTask;
import toolbox.ToolBox;
public class TwrClose {
public static void main(String... args) throws Exception {
for (int i = 1; i < Lower.USE_CLOSE_RESOURCE_METHOD_THRESHOLD * 2; i++) {
new TwrClose().compile(i);
}
}
ToolBox tb = new ToolBox();
JavaFileManager fm = ToolProvider.getSystemJavaCompiler()
.getStandardFileManager(null, null, null);
void compile(int trysCount) throws Exception {
StringBuilder testInvocations = new StringBuilder();
StringBuilder testMethods = new StringBuilder();
for (int i = 0; i < trysCount; i++) {
testInvocations.append(TEST_INVOCATIONS_TEMPLATE.replace("#N", Integer.toString(i)));
testMethods.append(TEST_METHOD_TEMPLATE.replace("#N", Integer.toString(i)));
}
String sourceCode = FILE_TEMPLATE.replace("#TEST_INVOCATIONS", testInvocations.toString())
.replace("#TEST_METHODS", testMethods.toString());
System.err.println("analyzing:");
System.err.println(sourceCode);
try (ToolBox.MemoryFileManager mfm = new ToolBox.MemoryFileManager()) {
new JavacTask(tb).fileManager(mfm)
.sources(sourceCode)
.run()
.writeAll();
ClassLoader cl = new ClassLoader(TwrClose.class.getClassLoader()) {
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
byte[] data = mfm.getFileBytes(StandardLocation.CLASS_OUTPUT, name);
if (data != null) {
return defineClass(name, data, 0, data.length);
}
return super.findClass(name);
}
};
((Runnable) cl.loadClass("Test").newInstance()).run();
}
}
final String TEST_INVOCATIONS_TEMPLATE =
" test#N(false, false, Arrays.asList(\"close\"));\n" +
" test#N(false, true, Arrays.asList(\"close\", \"close-exception\"));\n" +
" test#N(true, false, Arrays.asList(\"close\", \"inTwr\"));\n" +
" test#N(true, true, Arrays.asList(\"close\", \"inTwr\", \"close-exception\"));\n";
final String TEST_METHOD_TEMPLATE =
" private void test#N(boolean failInTwr, boolean failOnClose,\n" +
" List<String> expectedMessages) {\n" +
" List<String> messages = new ArrayList<>();\n" +
" try {\n" +
" try (CloseableImpl c = new CloseableImpl(messages, failOnClose)) {\n" +
" if (failInTwr)\n" +
" throw new IllegalStateException(\"inTwr\");\n" +
" }\n" +
" } catch (IllegalStateException ex) {\n" +
" messages.add(ex.getMessage());\n" +
" for (Throwable t : ex.getSuppressed()) {\n" +
" messages.add(t.getMessage());\n" +
" }\n" +
" }\n" +
" if (!expectedMessages.equals(messages))\n" +
" throw new AssertionError(\"Expected and actual messages differ; expectedMessages=\" +\n" +
" expectedMessages + \"; actual=\" + messages);\n" +
" }\n";
final String FILE_TEMPLATE =
"import java.util.*;\n" +
"public class Test implements Runnable {\n" +
" public void run() {\n" +
"#TEST_INVOCATIONS" +
" }\n" +
"#TEST_METHODS" +
" static class CloseableImpl implements AutoCloseable {\n" +
" private final List<String> messages;\n" +
" private final boolean failOnClose;\n" +
" public CloseableImpl(List<String> messages, boolean failOnClose) {\n" +
" this.messages = messages;\n" +
" this.failOnClose = failOnClose;\n" +
" }\n" +
" @Override\n" +
" public void close() {\n" +
" messages.add(\"close\");\n" +
" if (failOnClose)\n" +
" throw new IllegalStateException(\"close-exception\");\n" +
" }\n" +
" }\n" +
"}\n";
}

158
langtools/test/tools/javac/TryWithResources/TwrShareCloseCode.java Normal file
View file

@ -0,0 +1,158 @@
/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 7020499
* @summary Verify that the code that closes the resources is shared by among try-with-resources
* @library /tools/lib
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.code
* jdk.compiler/com.sun.tools.javac.comp
* jdk.compiler/com.sun.tools.javac.tree
* jdk.compiler/com.sun.tools.javac.util
* @build toolbox.ToolBox TwrShareCloseCode
* @run main TwrShareCloseCode
*/
import java.io.IOException;
import java.util.Arrays;
import com.sun.source.util.JavacTask;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.comp.AttrContext;
import com.sun.tools.javac.comp.Env;
import com.sun.tools.javac.comp.Lower;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
import com.sun.tools.javac.tree.TreeInfo;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.tree.TreeScanner;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Context.Factory;
import com.sun.tools.javac.util.List;
import toolbox.ToolBox;
public class TwrShareCloseCode {
public static void main(String... args) throws IOException {
new TwrShareCloseCode().run();
}
void run() throws IOException {
run("try (Test t1 = new Test()) { }", true);
run("try (Test t1 = new Test()) { }\n" +
"try (Test t2 = new Test()) { }", true);
run("try (Test t1 = new Test();\n" +
" Test t2 = new Test()) { }", true);
run("try (Test t1 = new Test()) { }\n" +
"try (Test t2 = new Test()) { }\n" +
"try (Test t3 = new Test()) { }", true);
run("try (Test t1 = new Test();\n" +
" Test t2 = new Test();\n" +
" Test t3 = new Test()) { }", false);
run("try (Test t1 = new Test()) { }\n" +
"try (Test t2 = new Test()) { }\n" +
"try (Test t3 = new Test()) { }\n" +
"try (Test t4 = new Test()) { }", false);
run("try (Test t1 = new Test()) { i++; }", true);
run("try (Test t1 = new Test()) { i++; }\n" +
"try (Test t2 = new Test()) { i++; }", false);
run("try (Test t1 = new Test(); Test t2 = new Test()) { i++; }", false);
run("try (Test t1 = new Test()) { i++; }\n" +
"try (Test t2 = new Test()) { }", true);
run("try (Test t1 = new Test()) { i++; }\n" +
"try (Test t2 = new Test()) { }\n" +
"try (Test t3 = new Test()) { }", false);
run("try (Test t1 = new Test()) { i++; }\n" +
"try (Test t2 = new Test()) { i++; }\n" +
"try (Test t3 = new Test()) { }", false);
}
void run(String trySpec, boolean expected) throws IOException {
String template = "public class Test implements AutoCloseable {\n" +
" void t(int i) {\n" +
" TRY\n" +
" }\n" +
" public void close() { }\n" +
"}\n";
String code = template.replace("TRY", trySpec);
Context ctx = new Context();
DumpLower.preRegister(ctx);
Iterable<ToolBox.JavaSource> files = Arrays.asList(new ToolBox.JavaSource(code));
JavacTask task = JavacTool.create().getTask(null, null, null, null, null, files, ctx);
task.call();
boolean actual = ((DumpLower) DumpLower.instance(ctx)).closeSeen;
if (expected != actual) {
throw new IllegalStateException("expected: " + expected + "; actual: " + actual + "; code:\n" + code);
}
}
static class DumpLower extends Lower {
public static void preRegister(Context ctx) {
ctx.put(lowerKey, new Factory<Lower>() {
@Override
public Lower make(Context c) {
return new DumpLower(c);
}
});
}
public DumpLower(Context context) {
super(context);
}
boolean closeSeen;
@Override
public List<JCTree> translateTopLevelClass(Env<AttrContext> env, JCTree cdef, TreeMaker make) {
List<JCTree> result = super.translateTopLevelClass(env, cdef, make);
new TreeScanner() {
@Override
public void visitMethodDef(JCMethodDecl tree) {
if (!tree.name.contentEquals("t"))
return;
super.visitMethodDef(tree);
}
@Override
public void visitApply(JCMethodInvocation tree) {
closeSeen |= TreeInfo.symbol(tree.meth).name.contentEquals("close");
super.visitApply(tree);
}
}.scan(result);
return result;
}
}
}

14
langtools/test/tools/javac/annotations/typeAnnotations/referenceinfos/ResourceVariable.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -36,9 +36,9 @@ import static java.lang.System.lineSeparator;
public class ResourceVariable {
@TADescription(annotation = "TA", type = RESOURCE_VARIABLE,
lvarOffset = {10}, lvarLength = {118}, lvarIndex = {1})
lvarOffset = {10}, lvarLength = {106}, lvarIndex = {1})
@TADescription(annotation = "TB", type = RESOURCE_VARIABLE,
lvarOffset = {22}, lvarLength = {35}, lvarIndex = {3})
lvarOffset = {22}, lvarLength = {31}, lvarIndex = {3})
public String testResourceVariable() {
return
"public void f() throws IOException {" + lineSeparator() +
@ -49,7 +49,7 @@ public class ResourceVariable {
}
@TADescription(annotation = "RTAs", type = RESOURCE_VARIABLE,
lvarOffset = {10}, lvarLength = {30}, lvarIndex = {1})
lvarOffset = {10}, lvarLength = {26}, lvarIndex = {1})
public String testRepeatedAnnotation1() {
return
"public void f() throws IOException {" + lineSeparator() +
@ -58,7 +58,7 @@ public class ResourceVariable {
}
@TADescription(annotation = "RTAs", type = RESOURCE_VARIABLE,
lvarOffset = {10}, lvarLength = {30}, lvarIndex = {1})
lvarOffset = {10}, lvarLength = {26}, lvarIndex = {1})
public String testRepeatedAnnotation2() {
return
"public void f() throws IOException {" + lineSeparator() +
@ -67,9 +67,9 @@ public class ResourceVariable {
}
@TADescription(annotation = "TA", type = RESOURCE_VARIABLE,
lvarOffset = {10}, lvarLength = {118}, lvarIndex = {1})
lvarOffset = {10}, lvarLength = {106}, lvarIndex = {1})
@TADescription(annotation = "TB", type = RESOURCE_VARIABLE,
lvarOffset = {22}, lvarLength = {35}, lvarIndex = {3})
lvarOffset = {22}, lvarLength = {31}, lvarIndex = {3})
public String testSeveralVariablesInTryWithResources() {
return
"public void f() throws IOException {" + lineSeparator() +

10
langtools/test/tools/javac/flow/tests/TestCaseTry.java
View file

@ -52,9 +52,9 @@ public class TestCaseTry {
o = "";
}
@AliveRange(varName="o", bytecodeStart=22, bytecodeLength=38)
@AliveRange(varName="o", bytecodeStart=103, bytecodeLength=3)
@AliveRange(varName="o", bytecodeStart=110, bytecodeLength=1)
@AliveRange(varName="o", bytecodeStart=22, bytecodeLength=13)
@AliveRange(varName="o", bytecodeStart=53, bytecodeLength=3)
@AliveRange(varName="o", bytecodeStart=60, bytecodeLength=1)
void m3() {
Object o;
try (BufferedReader br =
@ -65,8 +65,8 @@ public class TestCaseTry {
o = "";
}
@AliveRange(varName="o", bytecodeStart=12, bytecodeLength=96)
@AliveRange(varName="o", bytecodeStart=112, bytecodeLength=1)
@AliveRange(varName="o", bytecodeStart=12, bytecodeLength=46)
@AliveRange(varName="o", bytecodeStart=62, bytecodeLength=1)
void m4() {
String o;
try (BufferedReader br =