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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dex_builder.h"
#include "dex/art_dex_file_loader.h"
#include "dex/dex_file.h"
#include "gtest/gtest.h"
using namespace startop::dex;
// Takes a DexBuilder, encodes it into an in-memory DEX file, verifies the resulting DEX file and
// returns whether the verification was successful.
bool EncodeAndVerify(DexBuilder* dex_file) {
slicer::MemView image{dex_file->CreateImage()};
art::ArtDexFileLoader loader;
std::string error_msg;
std::unique_ptr<const art::DexFile> loaded_dex_file{loader.Open(image.ptr<const uint8_t>(),
image.size(),
/*location=*/"",
/*location_checksum=*/0,
/*oat_dex_file=*/nullptr,
/*verify=*/true,
/*verify_checksum=*/false,
&error_msg)};
return loaded_dex_file != nullptr;
}
// Write out and verify a DEX file that corresponds to:
//
// package dextest;
// public class DexTest {
// public static void foo() {}
// }
TEST(DexBuilderTest, VerifyDexWithClassMethod) {
DexBuilder dex_file;
auto cbuilder{dex_file.MakeClass("dextest.DexTest")};
auto method{cbuilder.CreateMethod("foo", Prototype{TypeDescriptor::Void()})};
method.BuildReturn();
method.Encode();
EXPECT_TRUE(EncodeAndVerify(&dex_file));
}
// Makes sure a bad DEX class fails to verify.
TEST(DexBuilderTest, VerifyBadDexWithClassMethod) {
DexBuilder dex_file;
auto cbuilder{dex_file.MakeClass("dextest.DexTest")};
// This method has the error, because methods cannot take Void() as a parameter.
auto method{
cbuilder.CreateMethod("foo", Prototype{TypeDescriptor::Void(), TypeDescriptor::Void()})};
method.BuildReturn();
method.Encode();
EXPECT_FALSE(EncodeAndVerify(&dex_file));
}
// Write out and verify a DEX file that corresponds to:
//
// package dextest;
// public class DexTest {
// public static int foo() { return 5; }
// }
TEST(DexBuilderTest, VerifyDexReturn5) {
DexBuilder dex_file;
auto cbuilder{dex_file.MakeClass("dextest.DexTest")};
auto method{cbuilder.CreateMethod("foo", Prototype{TypeDescriptor::Int()})};
auto r = method.MakeRegister();
method.BuildConst4(r, 5);
method.BuildReturn(r);
method.Encode();
EXPECT_TRUE(EncodeAndVerify(&dex_file));
}
// Write out and verify a DEX file that corresponds to:
//
// package dextest;
// public class DexTest {
// public static int foo(int x) { return x; }
// }
TEST(DexBuilderTest, VerifyDexReturnIntParam) {
DexBuilder dex_file;
auto cbuilder{dex_file.MakeClass("dextest.DexTest")};
auto method{
cbuilder.CreateMethod("foo", Prototype{TypeDescriptor::Int(), TypeDescriptor::Int()})};
method.BuildReturn(Value::Parameter(0));
method.Encode();
EXPECT_TRUE(EncodeAndVerify(&dex_file));
}
// Write out and verify a DEX file that corresponds to:
//
// package dextest;
// public class DexTest {
// public static int foo(String s) { return s.length(); }
// }
TEST(DexBuilderTest, VerifyDexCallStringLength) {
DexBuilder dex_file;
auto cbuilder{dex_file.MakeClass("dextest.DexTest")};
MethodBuilder method{cbuilder.CreateMethod(
"foo", Prototype{TypeDescriptor::Int(), TypeDescriptor::FromClassname("java.lang.String")})};
Value result = method.MakeRegister();
MethodDeclData string_length =
dex_file.GetOrDeclareMethod(TypeDescriptor::FromClassname("java.lang.String"),
"length",
Prototype{TypeDescriptor::Int()});
method.AddInstruction(Instruction::InvokeVirtual(string_length.id, result, Value::Parameter(0)));
method.BuildReturn(result);
method.Encode();
EXPECT_TRUE(EncodeAndVerify(&dex_file));
}
// Write out and verify a DEX file that corresponds to:
//
// package dextest;
// public class DexTest {
// public static int foo(String s) { return s.length(); }
// }
TEST(DexBuilderTest, VerifyDexCallManyRegisters) {
DexBuilder dex_file;
auto cbuilder{dex_file.MakeClass("dextest.DexTest")};
MethodBuilder method{cbuilder.CreateMethod(
"foo", Prototype{TypeDescriptor::Int()})};
Value result = method.MakeRegister();
// Make a bunch of registers
for (size_t i = 0; i < 25; ++i) {
method.MakeRegister();
}
// Now load a string literal into a register
Value string_val = method.MakeRegister();
method.BuildConstString(string_val, "foo");
MethodDeclData string_length =
dex_file.GetOrDeclareMethod(TypeDescriptor::FromClassname("java.lang.String"),
"length",
Prototype{TypeDescriptor::Int()});
method.AddInstruction(Instruction::InvokeVirtual(string_length.id, result, string_val));
method.BuildReturn(result);
method.Encode();
EXPECT_TRUE(EncodeAndVerify(&dex_file));
}
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