jnr.ffi.provider.jffi.StubCompiler Maven / Gradle / Ivy
/*
* Copyright (C) 2008-2010 Wayne Meissner
*
* This file is part of the JNR 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.
*/
package jnr.ffi.provider.jffi;
import com.kenai.jffi.*;
import jnr.ffi.CallingConvention;
import jnr.ffi.provider.ParameterType;
import jnr.ffi.provider.ResultType;
import jnr.x86asm.Assembler;
import jnr.x86asm.CPU;
import jnr.a64asm.Assembler_A64;
import jnr.a64asm.CPU_A64;
/**
* Compiles asm trampoline stubs for java class methods
*/
@SuppressWarnings({ "rawtypes" })
abstract class StubCompiler {
// If the version of jffi exports the jffi_save_errno function address,
// then it is recent enough to support PageManager and NativeMethods as well.
static final long errnoFunctionAddress = getErrnoSaveFunction();
static final boolean hasPageManager = hasPageManager();
static final boolean hasAssembler = hasAssembler();
public static StubCompiler newCompiler(jnr.ffi.Runtime runtime) {
if (errnoFunctionAddress != 0 && hasPageManager && hasAssembler) {
switch (Platform.getPlatform().getCPU()) {
case I386:
if (Platform.getPlatform().getOS() != Platform.OS.WINDOWS) {
return new X86_32StubCompiler(runtime); //currently supporting only A64
}
break;
case X86_64:
if (Platform.getPlatform().getOS() != Platform.OS.WINDOWS) {
return new X86_64StubCompiler(runtime); //currently supporting only A64
}
break;
case AARCH64:
if (Platform.getPlatform().getOS() != Platform.OS.WINDOWS) {
return new ARM_64StubCompiler(runtime);
}
break;
default:
break;
}
}
return new DummyStubCompiler();
}
abstract boolean canCompile(ResultType returnType, ParameterType[] parameterTypes, CallingConvention convention);
abstract void compile(Function function, String name, ResultType returnType, ParameterType[] parameterTypes,
Class resultClass, Class[] parameterClasses, CallingConvention convention, boolean saveErrno);
abstract void attach(Class clazz);
static final class DummyStubCompiler extends StubCompiler {
boolean canCompile(ResultType returnType, ParameterType[] parameterTypes, CallingConvention convention) {
return false;
}
@Override
void compile(Function function, String name, ResultType returnType, ParameterType[] parameterTypes,
Class resultClass, Class[] parameterClasses, CallingConvention convention, boolean saveErrno) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
void attach(Class clazz) {
// do nothing
}
}
private static long getErrnoSaveFunction() {
try {
return Internals.getErrnoSaveFunction();
} catch (Throwable t) {
return 0;
}
}
private static boolean hasPageManager() {
try {
// Just try and allocate/free a page to check the PageManager is working
long page = PageManager.getInstance().allocatePages(1, PageManager.PROT_READ | PageManager.PROT_WRITE);
PageManager.getInstance().freePages(page, 1);
return true;
} catch (Throwable t) {
return false;
}
}
private static boolean hasAssembler() {
try {
switch (Platform.getPlatform().getCPU()) {
case I386:
new Assembler(CPU.X86_32);
return true;
case X86_64:
new Assembler(CPU.X86_64);
return true;
case AARCH64:
new Assembler_A64(CPU_A64.A64);
return true;
default:
return false;
}
} catch (Throwable t) {
return false;
}
}
}