JNIFrame.cs

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/*
  Copyright (C) 2002-2014 Jeroen Frijters
 
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.
 
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
 
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
 
  Jeroen Frijters
  jeroen@frijters.net
  
*/
using System;
using System.Diagnostics;
using System.Text;
 
namespace IKVM.Runtime.JNI
{
 
    public unsafe struct JNIFrame
    {
 
        public static nint GetFuncPtr(object callerID, string clazz, string name, string sig)
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            var loader = RuntimeClassLoader.FromCallerID((ikvm.@internal.CallerID)callerID);
            var argl = sizeof(nint) + sizeof(nint);
            for (int i = 1; sig[i] != ')'; i++)
            {
                switch (sig[i])
                {
                    case '[':
                        argl += sizeof(nint);
                        while (sig[++i] == '[') ;
                        if (sig[i] == 'L')
                            while (sig[++i] != ';') ;
                        break;
                    case 'L':
                        argl += sizeof(nint);
                        while (sig[++i] != ';') ;
                        break;
                    case 'J':
                    case 'D':
                        argl += 8;
                        break;
                    case 'F':
                    case 'I':
                    case 'C':
                    case 'Z':
                    case 'S':
                    case 'B':
                        argl += 4;
                        break;
                    default:
                        Debug.Assert(false);
                        break;
                }
            }
 
            var mangledClass = JniMangle(clazz);
            var mangledName = JniMangle(name);
            var mangledSig = JniMangle(sig.Substring(1, sig.IndexOf(')') - 1));
            var methodName = $"Java_{mangledClass}_{mangledName}";
            var longMethodName = $"Java_{mangledClass}_{mangledName}__{mangledSig}";
            JVM.Context.Diagnostics.GenericJniInfo($"Linking native method: {clazz}.{name}{sig}, classLoader = {loader}, methodName = {methodName}, longMethodName = {longMethodName}, argl = {argl}");
 
            lock (JNINativeLoader.SyncRoot)
            {
                foreach (var p in loader.GetNativeLibraries())
                {
                    if (LibJvm.Instance.JVM_FindLibraryEntry(p, NativeLibrary.MangleExportName(methodName, argl)) is nint h1 and not 0)
                    {
                        JVM.Context.Diagnostics.GenericJniInfo($"Native method {clazz}.{name}{sig} found in library 0x{p:X} (short)");
                        return h1;
                    }
 
                    if (LibJvm.Instance.JVM_FindLibraryEntry(p, NativeLibrary.MangleExportName(longMethodName, argl)) is nint h2 and not 0)
                    {
                        JVM.Context.Diagnostics.GenericJniInfo($"Native method {clazz}.{name}{sig} found in library 0x{p:X} (long)");
                        return h2;
                    }
                }
            }
 
            var msg = $"{clazz}.{name}{sig}";
            JVM.Context.Diagnostics.GenericJniError($"UnsatisfiedLinkError: {msg}");
            throw new java.lang.UnsatisfiedLinkError(msg);
#endif
        }
 
        static string JniMangle(string name)
        {
            var sb = new ValueStringBuilder(name.Length + 8);
 
            foreach (var c in name)
            {
                switch (c)
                {
                    case '/':
                        sb.Append('_');
                        break;
                    case '_':
                        sb.Append("_1");
                        break;
                    case ';':
                        sb.Append("_2");
                        break;
                    case '[':
                        sb.Append("_3");
                        break;
                    case >= '0' and <= '9':
                    case >= 'a' and <= 'z':
                    case >= 'A' and <= 'Z':
                        sb.Append(c);
                        break;
                    default:
                        sb.Append($"_0{(int)c:x4}");
                        break;
                }
            }
 
            return sb.ToString();
        }
 
#if FIRST_PASS || IMPORTER || EXPORTER
#else
 
        JNIEnvContext env;
        JNIEnvContext.FrameState prevFrameState;
 
#endif
 
        internal RuntimeClassLoader Enter(RuntimeClassLoader loader)
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            Enter((object)null);
 
            var prev = env.classLoader;
            env.classLoader = loader;
            return prev;
#endif
        }
 
        internal readonly void Leave(RuntimeClassLoader prev)
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            env.classLoader = prev;
            Leave();
#endif
        }
 
        public nint Enter(object callerID)
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            env = JNIEnvContext.Current ?? JNIEnv.CreateJNIEnv(JVM.Context)->GetContext();
            prevFrameState = env.Enter((ikvm.@internal.CallerID)callerID);
            return (nint)(void*)env.pJNIEnv;
#endif
        }
 
        public readonly void Leave()
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            env.Leave(prevFrameState);
            JVM.ThrowPendingException();
#endif
        }
 
        public readonly nint MakeLocalRef(object obj)
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            return env.MakeLocalRef(obj);
#endif
        }
 
        public readonly object UnwrapLocalRef(nint p)
        {
#if FIRST_PASS || IMPORTER || EXPORTER
            throw new NotImplementedException();
#else
            return JNIEnv.UnwrapRef(env, p);
#endif
        }
 
    }
 
}