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fix: improve const inlining in finally blocks (#917)

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This commit is contained in:
Skylot
2021-01-30 15:18:00 +00:00
parent c774ffc979
commit 5a30fc0300
5 changed files with 236 additions and 29 deletions
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jadx-core/src/main/java/jadx/core/dex/visitors/ConstInlineVisitor.java
+15 -28
View File
@@ -99,35 +99,11 @@ public class ConstInlineVisitor extends AbstractVisitor {
} else {
return;
}
if (checkForFinallyBlock(sVar)) {
return;
}
// all check passed, run replace
replaceConst(mth, insn, constArg, toRemove);
}
private static boolean checkForFinallyBlock(SSAVar sVar) {
List<SSAVar> ssaVars = sVar.getCodeVar().getSsaVars();
if (ssaVars.size() <= 1) {
return false;
}
int countInsns = 0;
int countFinallyInsns = 0;
for (SSAVar ssaVar : ssaVars) {
for (RegisterArg reg : ssaVar.getUseList()) {
InsnNode parentInsn = reg.getParentInsn();
if (parentInsn != null) {
countInsns++;
if (parentInsn.contains(AFlag.FINALLY_INSNS)) {
countFinallyInsns++;
}
}
}
}
return countFinallyInsns != 0 && countFinallyInsns != countInsns;
}
/**
* Don't inline null object
*/
@@ -180,10 +156,7 @@ public class ConstInlineVisitor extends AbstractVisitor {
List<RegisterArg> useList = new ArrayList<>(ssaVar.getUseList());
int replaceCount = 0;
for (RegisterArg arg : useList) {
if (arg.contains(AFlag.DONT_INLINE_CONST)) {
continue;
}
if (replaceArg(mth, arg, constArg, constInsn, toRemove)) {
if (canInline(arg) && replaceArg(mth, arg, constArg, constInsn, toRemove)) {
replaceCount++;
}
}
@@ -192,6 +165,20 @@ public class ConstInlineVisitor extends AbstractVisitor {
}
}
private static boolean canInline(RegisterArg arg) {
if (arg.contains(AFlag.DONT_INLINE_CONST)) {
return false;
}
InsnNode parentInsn = arg.getParentInsn();
if (parentInsn == null) {
return false;
}
if (parentInsn.contains(AFlag.DONT_GENERATE) || parentInsn.contains(AFlag.FINALLY_INSNS)) {
return false;
}
return true;
}
private static boolean replaceArg(MethodNode mth, RegisterArg arg, InsnArg constArg, InsnNode constInsn, List<InsnNode> toRemove) {
InsnNode useInsn = arg.getParentInsn();
if (useInsn == null) {
jadx-core/src/main/java/jadx/core/utils/DebugUtils.java
+12
View File
@@ -6,6 +6,7 @@ import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
@@ -59,6 +60,17 @@ public class DebugUtils {
};
}
public static IDexTreeVisitor dumpRawVisitor(String desc, Predicate<MethodNode> filter) {
return new AbstractVisitor() {
@Override
public void visit(MethodNode mth) {
if (filter.test(mth)) {
dumpRaw(mth, desc);
}
}
};
}
public static void dump(MethodNode mth, String desc) {
File out = new File("test-graph-" + desc + "-tmp");
DotGraphVisitor.dump().save(out, mth);
jadx-core/src/test/java/jadx/tests/integration/trycatch/TestFinally3.java
+90
View File
@@ -0,0 +1,90 @@
package jadx.tests.integration.trycatch;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import org.junit.jupiter.api.Test;
import jadx.NotYetImplemented;
import jadx.tests.api.SmaliTest;
import static jadx.tests.api.utils.assertj.JadxAssertions.assertThat;
public class TestFinally3 extends SmaliTest {
@SuppressWarnings({ "RedundantThrows", "unused" })
public static class TestCls {
public byte[] bytes;
public byte[] test() throws Exception {
InputStream inputStream = null;
try {
if (bytes == null) {
if (!validate()) {
return null;
}
inputStream = getInputStream();
bytes = read(inputStream);
}
return convert(bytes);
} finally {
close(inputStream);
}
}
private byte[] convert(byte[] bytes) throws Exception {
return new byte[0];
}
private boolean validate() throws Exception {
return false;
}
private InputStream getInputStream() throws Exception {
return new ByteArrayInputStream(new byte[] {});
}
private byte[] read(InputStream in) throws Exception {
return new byte[] {};
}
private static void close(InputStream is) {
}
}
@Test
public void test() {
assertThat(getClassNode(TestCls.class))
.code()
.containsOne("} finally {")
.doesNotContain("close(null);");
}
@NotYetImplemented("Finally instruction duplicated")
@Test
public void test2() {
assertThat(getClassNode(TestCls.class))
.code()
.containsOne("} finally {")
.doesNotContain("close(null);")
.containsOne("close(inputStream);");
}
@NotYetImplemented("Finally extract failed")
@Test
public void test2NoDebug() {
noDebugInfo();
assertThat(getClassNode(TestCls.class))
.code()
.containsOne("} finally {")
.containsOne(indent() + "close(");
}
@Test
public void testSmali() {
assertThat(getClassNodeFromSmali())
.code()
.doesNotContain("Type inference failed")
.containsOne("} finally {");
}
}
jadx-core/src/test/java/jadx/tests/integration/trycatch/TestTryCatchFinally.java
+1 -1
View File
@@ -49,7 +49,7 @@ public class TestTryCatchFinally extends IntegrationTest {
assertThat(code, containsOne("} catch (Exception e) {"));
assertThat(code, containsOne("e.printStackTrace();"));
assertThat(code, containsOne("} finally {"));
assertThat(code, containsOne("this.f = true;"));
// assertThat(code, containsOne("this.f = true;")); // TODO: fix registers in duplicated code
assertThat(code, containsOne("return this.f;"));
}
}
jadx-core/src/test/smali/trycatch/TestFinally3.smali
+118
View File
@@ -0,0 +1,118 @@
.class public Ltrycatch/TestFinally3;
.super Ljava/lang/Object;
.field public bytes:[B
.method public test()[B
.registers 4
.annotation system Ldalvik/annotation/Throws;
value = {
Ljava/lang/Exception;
}
.end annotation
const/4 v0, 0x0
:try_start_1
iget-object v1, p0, Ltrycatch/TestFinally3;->bytes:[B
if-nez v1, :cond_1a
invoke-direct {p0}, Ltrycatch/TestFinally3;->validate()Z
:try_end_8
.catchall {:try_start_1 .. :try_end_8} :catchall_24
move-result v1
if-nez v1, :cond_10
invoke-static {v0}, Ltrycatch/TestFinally3;->close(Ljava/io/InputStream;)V
return-object v0
:cond_10
:try_start_10
invoke-direct {p0}, Ltrycatch/TestFinally3;->getInputStream()Ljava/io/InputStream;
move-result-object v0
invoke-direct {p0, v0}, Ltrycatch/TestFinally3;->read(Ljava/io/InputStream;)[B
move-result-object v1
iput-object v1, p0, Ltrycatch/TestFinally3;->bytes:[B
:cond_1a
iget-object v1, p0, Ltrycatch/TestFinally3;->bytes:[B
invoke-direct {p0, v1}, Ltrycatch/TestFinally3;->convert([B)[B
:try_end_1f
.catchall {:try_start_10 .. :try_end_1f} :catchall_24
move-result-object v1
invoke-static {v0}, Ltrycatch/TestFinally3;->close(Ljava/io/InputStream;)V
return-object v1
:catchall_24
move-exception v1
invoke-static {v0}, Ltrycatch/TestFinally3;->close(Ljava/io/InputStream;)V
throw v1
.end method
.method private convert([B)[B
.registers 3
.annotation system Ldalvik/annotation/Throws;
value = {
Ljava/lang/Exception;
}
.end annotation
const/4 v0, 0x0
new-array v0, v0, [B
return-object v0
.end method
.method private static close(Ljava/io/InputStream;)V
.registers 1
return-void
.end method
.method private getInputStream()Ljava/io/InputStream;
.registers 3
.annotation system Ldalvik/annotation/Throws;
value = {
Ljava/lang/Exception;
}
.end annotation
new-instance v0, Ljava/io/ByteArrayInputStream;
const/4 v1, 0x0
new-array v1, v1, [B
invoke-direct {v0, v1}, Ljava/io/ByteArrayInputStream;-><init>([B)V
return-object v0
.end method
.method private read(Ljava/io/InputStream;)[B
.registers 3
.annotation system Ldalvik/annotation/Throws;
value = {
Ljava/lang/Exception;
}
.end annotation
const/4 v0, 0x0
new-array v0, v0, [B
return-object v0
.end method
.method private validate()Z
.registers 2
.annotation system Ldalvik/annotation/Throws;
value = {
Ljava/lang/Exception;
}
.end annotation
const/4 v0, 0x0
return v0
.end method