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compiler.cs
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compiler.cs
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/*
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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
*/
#if !COMPACT_FRAMEWORK
using System;
using System.Collections;
using System.Reflection;
using System.Reflection.Emit;
using System.Diagnostics;
using System.Diagnostics.SymbolStore;
using IKVM.Runtime;
using IKVM.Attributes;
using IKVM.Internal;
using ILGenerator = IKVM.Internal.CountingILGenerator;
using Label = IKVM.Internal.CountingLabel;
using ExceptionTableEntry = IKVM.Internal.ClassFile.Method.ExceptionTableEntry;
using LocalVariableTableEntry = IKVM.Internal.ClassFile.Method.LocalVariableTableEntry;
using Instruction = IKVM.Internal.ClassFile.Method.Instruction;
class ByteCodeHelperMethods
{
internal static readonly MethodInfo GetClassFromTypeHandle;
internal static readonly MethodInfo multianewarray;
internal static readonly MethodInfo f2i;
internal static readonly MethodInfo d2i;
internal static readonly MethodInfo f2l;
internal static readonly MethodInfo d2l;
internal static readonly MethodInfo arraycopy_fast;
internal static readonly MethodInfo arraycopy_primitive_8;
internal static readonly MethodInfo arraycopy_primitive_4;
internal static readonly MethodInfo arraycopy_primitive_2;
internal static readonly MethodInfo arraycopy_primitive_1;
internal static readonly MethodInfo arraycopy;
internal static readonly MethodInfo DynamicCast;
internal static readonly MethodInfo DynamicGetTypeAsExceptionType;
internal static readonly MethodInfo DynamicAaload;
internal static readonly MethodInfo DynamicAastore;
internal static readonly MethodInfo DynamicClassLiteral;
internal static readonly MethodInfo DynamicGetfield;
internal static readonly MethodInfo DynamicGetstatic;
internal static readonly MethodInfo DynamicInvokeSpecialNew;
internal static readonly MethodInfo DynamicInvokestatic;
internal static readonly MethodInfo DynamicInvokevirtual;
internal static readonly MethodInfo DynamicMultianewarray;
internal static readonly MethodInfo DynamicNewarray;
internal static readonly MethodInfo DynamicNewCheckOnly;
internal static readonly MethodInfo DynamicPutfield;
internal static readonly MethodInfo DynamicPutstatic;
internal static readonly MethodInfo VerboseCastFailure;
internal static readonly MethodInfo SkipFinalizer;
internal static readonly MethodInfo DynamicInstanceOf;
internal static readonly MethodInfo volatileReadDouble;
internal static readonly MethodInfo volatileReadLong;
internal static readonly MethodInfo volatileWriteDouble;
internal static readonly MethodInfo volatileWriteLong;
static ByteCodeHelperMethods()
{
#if STATIC_COMPILER
Type typeofByteCodeHelper = StaticCompiler.GetType("IKVM.Runtime.ByteCodeHelper");
#else
Type typeofByteCodeHelper = typeof(ByteCodeHelper);
#endif
GetClassFromTypeHandle = typeofByteCodeHelper.GetMethod("GetClassFromTypeHandle");
multianewarray = typeofByteCodeHelper.GetMethod("multianewarray");
f2i = typeofByteCodeHelper.GetMethod("f2i");
d2i = typeofByteCodeHelper.GetMethod("d2i");
f2l = typeofByteCodeHelper.GetMethod("f2l");
d2l = typeofByteCodeHelper.GetMethod("d2l");
arraycopy_fast = typeofByteCodeHelper.GetMethod("arraycopy_fast");
arraycopy_primitive_8 = typeofByteCodeHelper.GetMethod("arraycopy_primitive_8");
arraycopy_primitive_4 = typeofByteCodeHelper.GetMethod("arraycopy_primitive_4");
arraycopy_primitive_2 = typeofByteCodeHelper.GetMethod("arraycopy_primitive_2");
arraycopy_primitive_1 = typeofByteCodeHelper.GetMethod("arraycopy_primitive_1");
arraycopy = typeofByteCodeHelper.GetMethod("arraycopy");
DynamicCast = typeofByteCodeHelper.GetMethod("DynamicCast");
DynamicGetTypeAsExceptionType = typeofByteCodeHelper.GetMethod("DynamicGetTypeAsExceptionType");
DynamicAaload = typeofByteCodeHelper.GetMethod("DynamicAaload");
DynamicAastore = typeofByteCodeHelper.GetMethod("DynamicAastore");
DynamicClassLiteral = typeofByteCodeHelper.GetMethod("DynamicClassLiteral");
DynamicGetfield = typeofByteCodeHelper.GetMethod("DynamicGetfield");
DynamicGetstatic = typeofByteCodeHelper.GetMethod("DynamicGetstatic");
DynamicInvokeSpecialNew = typeofByteCodeHelper.GetMethod("DynamicInvokeSpecialNew");
DynamicInvokestatic = typeofByteCodeHelper.GetMethod("DynamicInvokestatic");
DynamicInvokevirtual = typeofByteCodeHelper.GetMethod("DynamicInvokevirtual");
DynamicMultianewarray = typeofByteCodeHelper.GetMethod("DynamicMultianewarray");
DynamicNewarray = typeofByteCodeHelper.GetMethod("DynamicNewarray");
DynamicNewCheckOnly = typeofByteCodeHelper.GetMethod("DynamicNewCheckOnly");
DynamicPutfield = typeofByteCodeHelper.GetMethod("DynamicPutfield");
DynamicPutstatic = typeofByteCodeHelper.GetMethod("DynamicPutstatic");
VerboseCastFailure = typeofByteCodeHelper.GetMethod("VerboseCastFailure");
SkipFinalizer = typeofByteCodeHelper.GetMethod("SkipFinalizer");
DynamicInstanceOf = typeofByteCodeHelper.GetMethod("DynamicInstanceOf");
volatileReadDouble = typeofByteCodeHelper.GetMethod("VolatileRead", new Type[] { Type.GetType("System.Double&") });
volatileReadLong = typeofByteCodeHelper.GetMethod("VolatileRead", new Type[] { Type.GetType("System.Int64&") });
volatileWriteDouble = typeofByteCodeHelper.GetMethod("VolatileWrite", new Type[] { Type.GetType("System.Double&"), typeof(double) });
volatileWriteLong = typeofByteCodeHelper.GetMethod("VolatileWrite", new Type[] { Type.GetType("System.Int64&"), typeof(long) });
}
}
class Compiler
{
private static MethodInfo mapExceptionMethod;
private static MethodInfo mapExceptionFastMethod;
private static MethodInfo unmapExceptionMethod;
private static MethodWrapper initCauseMethod;
private static MethodInfo suppressFillInStackTraceMethod;
private static MethodInfo getTypeFromHandleMethod;
private static MethodInfo monitorEnterMethod;
private static MethodInfo monitorExitMethod;
private static MethodInfo keepAliveMethod;
private static MethodWrapper getClassFromTypeHandle;
private static TypeWrapper java_lang_Object;
private static TypeWrapper java_lang_Class;
private static TypeWrapper java_lang_Throwable;
private static TypeWrapper java_lang_ThreadDeath;
private static TypeWrapper cli_System_Object;
private static TypeWrapper cli_System_Exception;
private TypeWrapper clazz;
private MethodWrapper mw;
private ClassFile classFile;
private ClassFile.Method m;
private ILGenerator ilGenerator;
private MethodAnalyzer ma;
private ExceptionTableEntry[] exceptions;
private ISymbolDocumentWriter symboldocument;
private LineNumberTableAttribute.LineNumberWriter lineNumbers;
private bool nonleaf;
private LocalBuilder[] tempLocals = new LocalBuilder[32];
private Hashtable invokespecialstubcache;
private bool debug;
private bool keepAlive;
private bool strictfp;
#if STATIC_COMPILER
private IKVM.Internal.MapXml.ReplaceMethodCall[] replacedMethods;
private MethodWrapper[] replacedMethodWrappers;
#endif
static Compiler()
{
getTypeFromHandleMethod = typeof(Type).GetMethod("GetTypeFromHandle", BindingFlags.Static | BindingFlags.Public, null, new Type[] { typeof(RuntimeTypeHandle) }, null);
monitorEnterMethod = typeof(System.Threading.Monitor).GetMethod("Enter", BindingFlags.Static | BindingFlags.Public, null, new Type[] { typeof(object) }, null);
monitorExitMethod = typeof(System.Threading.Monitor).GetMethod("Exit", BindingFlags.Static | BindingFlags.Public, null, new Type[] { typeof(object) }, null);
keepAliveMethod = typeof(System.GC).GetMethod("KeepAlive", BindingFlags.Static | BindingFlags.Public, null, new Type[] { typeof(object) }, null);
java_lang_Object = CoreClasses.java.lang.Object.Wrapper;
java_lang_Throwable = CoreClasses.java.lang.Throwable.Wrapper;
cli_System_Object = DotNetTypeWrapper.GetWrapperFromDotNetType(typeof(System.Object));
cli_System_Exception = DotNetTypeWrapper.GetWrapperFromDotNetType(typeof(System.Exception));
java_lang_Class = CoreClasses.java.lang.Class.Wrapper;
java_lang_ThreadDeath = ClassLoaderWrapper.LoadClassCritical("java.lang.ThreadDeath");
// HACK we need to special case core compilation, because the __<map> methods are HideFromJava
if(java_lang_Throwable.TypeAsBaseType is TypeBuilder)
{
MethodWrapper mw = java_lang_Throwable.GetMethodWrapper("__<map>", "(Ljava.lang.Throwable;Lcli.System.Type;Z)Ljava.lang.Throwable;", false);
mw.Link();
mapExceptionMethod = (MethodInfo)mw.GetMethod();
mw = java_lang_Throwable.GetMethodWrapper("__<map>", "(Ljava.lang.Throwable;Z)Ljava.lang.Throwable;", false);
mw.Link();
mapExceptionFastMethod = (MethodInfo)mw.GetMethod();
mw = java_lang_Throwable.GetMethodWrapper("__<suppressFillInStackTrace>", "()V", false);
mw.Link();
suppressFillInStackTraceMethod = (MethodInfo)mw.GetMethod();
mw = java_lang_Throwable.GetMethodWrapper("__<unmap>", "(Ljava.lang.Throwable;)Ljava.lang.Throwable;", false);
mw.Link();
unmapExceptionMethod = (MethodInfo)mw.GetMethod();
}
else
{
mapExceptionMethod = java_lang_Throwable.TypeAsBaseType.GetMethod("__<map>", new Type[] { typeof(Exception), typeof(Type), typeof(bool) });
mapExceptionFastMethod = java_lang_Throwable.TypeAsBaseType.GetMethod("__<map>", new Type[] { typeof(Exception), typeof(bool) });
suppressFillInStackTraceMethod = java_lang_Throwable.TypeAsBaseType.GetMethod("__<suppressFillInStackTrace>", Type.EmptyTypes);
unmapExceptionMethod = java_lang_Throwable.TypeAsBaseType.GetMethod("__<unmap>", new Type[] { typeof(Exception) });
}
initCauseMethod = java_lang_Throwable.GetMethodWrapper("initCause", "(Ljava.lang.Throwable;)Ljava.lang.Throwable;", false);
getClassFromTypeHandle = ClassLoaderWrapper.LoadClassCritical("ikvm.runtime.Util").GetMethodWrapper("getClassFromTypeHandle", "(Lcli.System.RuntimeTypeHandle;)Ljava.lang.Class;", false);
getClassFromTypeHandle.Link();
}
private class ExceptionSorter : IComparer
{
public int Compare(object x, object y)
{
ExceptionTableEntry e1 = (ExceptionTableEntry)x;
ExceptionTableEntry e2 = (ExceptionTableEntry)y;
if(e1.start_pc < e2.start_pc)
{
return -1;
}
if(e1.start_pc == e2.start_pc)
{
if(e1.end_pc == e2.end_pc)
{
if(e1.ordinal > e2.ordinal)
{
return -1;
}
return 1;
}
if(e1.end_pc > e2.end_pc)
{
return -1;
}
}
return 1;
}
}
private Compiler(TypeWrapper clazz, MethodWrapper mw, ClassFile classFile, ClassFile.Method m, ILGenerator ilGenerator, ClassLoaderWrapper classLoader, ISymbolDocumentWriter symboldocument, Hashtable invokespecialstubcache)
{
this.clazz = clazz;
this.mw = mw;
this.classFile = classFile;
this.m = m;
this.ilGenerator = ilGenerator;
this.symboldocument = symboldocument;
this.invokespecialstubcache = invokespecialstubcache;
this.debug = classLoader.EmitDebugInfo;
this.strictfp = m.IsStrictfp;
if(m.LineNumberTableAttribute != null && classLoader.EmitStackTraceInfo)
{
this.lineNumbers = new LineNumberTableAttribute.LineNumberWriter(m.LineNumberTableAttribute.Length);
}
if(ReferenceEquals(mw.Name, StringConstants.INIT))
{
MethodWrapper finalize = clazz.GetMethodWrapper(StringConstants.FINALIZE, StringConstants.SIG_VOID, true);
keepAlive = finalize != null && finalize.DeclaringType != java_lang_Object && finalize.DeclaringType != cli_System_Object;
}
#if STATIC_COMPILER
replacedMethods = ((CompilerClassLoader)clazz.GetClassLoader()).GetReplacedMethodsFor(mw);
if(replacedMethods != null)
{
replacedMethodWrappers = new MethodWrapper[replacedMethods.Length];
}
#endif
Profiler.Enter("MethodAnalyzer");
try
{
ma = new MethodAnalyzer(clazz, mw, classFile, m, classLoader);
}
finally
{
Profiler.Leave("MethodAnalyzer");
}
TypeWrapper[] args = mw.GetParameters();
LocalVar[] locals = ma.GetAllLocalVars();
foreach(LocalVar v in locals)
{
if(v.isArg)
{
int arg = m.ArgMap[v.local];
TypeWrapper tw;
if(m.IsStatic)
{
tw = args[arg];
}
else if(arg == 0)
{
tw = clazz;
}
else
{
tw = args[arg - 1];
}
if(!tw.IsUnloadable &&
v.type != VerifierTypeWrapper.UninitializedThis &&
(v.type != tw || tw.TypeAsLocalOrStackType != tw.TypeAsSignatureType))
{
v.builder = ilGenerator.DeclareLocal(v.type.TypeAsLocalOrStackType);
if(debug && v.name != null)
{
v.builder.SetLocalSymInfo(v.name);
}
v.isArg = false;
ilGenerator.Emit(OpCodes.Ldarg_S, (byte)arg);
tw.EmitConvSignatureTypeToStackType(ilGenerator);
ilGenerator.Emit(OpCodes.Stloc, v.builder);
}
}
}
// NOTE we're going to be messing with ExceptionTableEntrys that are owned by the Method, this is very bad practice,
// this code should probably be changed to use our own ETE class (which should also contain the ordinal, instead
// of the one in ClassFile.cs)
ArrayList ar = new ArrayList(m.ExceptionTable);
// This optimization removes the recursive exception handlers that Java compiler place around
// the exit of a synchronization block to be "safe" in the face of asynchronous exceptions.
// (see http://weblog.ikvm.net/PermaLink.aspx?guid=3af9548e-4905-4557-8809-65a205ce2cd6)
// We can safely remove them since the code we generate for this construct isn't async safe anyway,
// but there is another reason why this optimization may be slightly controversial. In some
// pathological cases it can cause observable differences, where the Sun JVM would spin in an
// infinite loop, but we will throw an exception. However, the perf benefit is large enough to
// warrant this "incompatibility".
// Note that there is also code in the exception handler handling code that detects these bytecode
// sequences to try to compile them into a fault block, instead of an exception handler.
for(int i = 0; i < ar.Count; i++)
{
ExceptionTableEntry ei = (ExceptionTableEntry)ar[i];
if(ei.start_pc == ei.handler_pc && ei.catch_type == 0)
{
int index = FindPcIndex(ei.start_pc);
if(index + 2 < m.Instructions.Length
&& FindPcIndex(ei.end_pc) == index + 2
&& m.Instructions[index].NormalizedOpCode == NormalizedByteCode.__aload
&& m.Instructions[index + 1].NormalizedOpCode == NormalizedByteCode.__monitorexit
&& m.Instructions[index + 2].NormalizedOpCode == NormalizedByteCode.__athrow)
{
// this is the async exception guard that Jikes and the Eclipse Java Compiler produce
ar.RemoveAt(i);
i--;
}
else if(index + 4 < m.Instructions.Length
&& FindPcIndex(ei.end_pc) == index + 3
&& m.Instructions[index].NormalizedOpCode == NormalizedByteCode.__astore
&& m.Instructions[index + 1].NormalizedOpCode == NormalizedByteCode.__aload
&& m.Instructions[index + 2].NormalizedOpCode == NormalizedByteCode.__monitorexit
&& m.Instructions[index + 3].NormalizedOpCode == NormalizedByteCode.__aload
&& m.Instructions[index + 4].NormalizedOpCode == NormalizedByteCode.__athrow
&& m.Instructions[index].NormalizedArg1 == m.Instructions[index + 3].NormalizedArg1)
{
// this is the async exception guard that javac produces
ar.RemoveAt(i);
i--;
}
}
}
restart:
for(int i = 0; i < ar.Count; i++)
{
ExceptionTableEntry ei = (ExceptionTableEntry)ar[i];
for(int j = 0; j < ar.Count; j++)
{
ExceptionTableEntry ej = (ExceptionTableEntry)ar[j];
if(ei.start_pc <= ej.start_pc && ej.start_pc < ei.end_pc)
{
// 0006/test.j
if(ej.end_pc > ei.end_pc)
{
ExceptionTableEntry emi = new ExceptionTableEntry();
emi.start_pc = ej.start_pc;
emi.end_pc = ei.end_pc;
emi.catch_type = ei.catch_type;
emi.handler_pc = ei.handler_pc;
ExceptionTableEntry emj = new ExceptionTableEntry();
emj.start_pc = ej.start_pc;
emj.end_pc = ei.end_pc;
emj.catch_type = ej.catch_type;
emj.handler_pc = ej.handler_pc;
ei.end_pc = emi.start_pc;
ej.start_pc = emj.end_pc;
ar.Insert(j, emj);
ar.Insert(i + 1, emi);
goto restart;
}
// 0007/test.j
else if(j > i && ej.end_pc < ei.end_pc)
{
ExceptionTableEntry emi = new ExceptionTableEntry();
emi.start_pc = ej.start_pc;
emi.end_pc = ej.end_pc;
emi.catch_type = ei.catch_type;
emi.handler_pc = ei.handler_pc;
ExceptionTableEntry eei = new ExceptionTableEntry();
eei.start_pc = ej.end_pc;
eei.end_pc = ei.end_pc;
eei.catch_type = ei.catch_type;
eei.handler_pc = ei.handler_pc;
ei.end_pc = emi.start_pc;
ar.Insert(i + 1, eei);
ar.Insert(i + 1, emi);
goto restart;
}
}
}
}
// __jsr inside a try block (to a PC outside the try block) causes the try
// block to be broken into two blocks surrounding the __jsr
// This is actually pretty common. Take, for example, the following code:
// class hello
// {
// public static void main(String[] args)
// {
// try
// {
// for(;;)
// {
// if(args.length == 0) return;
// }
// }
// finally
// {
// System.out.println("Hello, world!");
// }
// }
// }
restart_jsr:
for(int i = 0; i < ar.Count; i++)
{
ExceptionTableEntry ei = (ExceptionTableEntry)ar[i];
for(int j = FindPcIndex(ei.start_pc), e = FindPcIndex(ei.end_pc); j < e; j++)
{
if(m.Instructions[j].NormalizedOpCode == NormalizedByteCode.__jsr)
{
int targetPC = m.Instructions[j].NormalizedArg1 + m.Instructions[j].PC;
if(targetPC < ei.start_pc || targetPC >= ei.end_pc)
{
ExceptionTableEntry en = new ExceptionTableEntry();
en.catch_type = ei.catch_type;
en.handler_pc = ei.handler_pc;
en.start_pc = (ushort)m.Instructions[j + 1].PC;
en.end_pc = ei.end_pc;
ei.end_pc = (ushort)m.Instructions[j].PC;
ar.Insert(i + 1, en);
goto restart_jsr;
}
}
}
}
// Split try blocks at branch targets (branches from outside the try block)
for(int i = 0; i < ar.Count; i++)
{
ExceptionTableEntry ei = (ExceptionTableEntry)ar[i];
int start = FindPcIndex(ei.start_pc);
int end = FindPcIndex(ei.end_pc);
for(int j = 0; j < m.Instructions.Length; j++)
{
if(j < start || j >= end)
{
switch(m.Instructions[j].NormalizedOpCode)
{
case NormalizedByteCode.__tableswitch:
case NormalizedByteCode.__lookupswitch:
// start at -1 to have an opportunity to handle the default offset
for(int k = -1; k < m.Instructions[j].SwitchEntryCount; k++)
{
int targetPC = m.Instructions[j].PC + (k == -1 ? m.Instructions[j].DefaultOffset : m.Instructions[j].GetSwitchTargetOffset(k));
if(ei.start_pc < targetPC && targetPC < ei.end_pc)
{
ExceptionTableEntry en = new ExceptionTableEntry();
en.catch_type = ei.catch_type;
en.handler_pc = ei.handler_pc;
en.start_pc = (ushort)targetPC;
en.end_pc = ei.end_pc;
ei.end_pc = (ushort)targetPC;
ar.Insert(i + 1, en);
goto restart_jsr;
}
}
break;
case NormalizedByteCode.__ifeq:
case NormalizedByteCode.__ifne:
case NormalizedByteCode.__iflt:
case NormalizedByteCode.__ifge:
case NormalizedByteCode.__ifgt:
case NormalizedByteCode.__ifle:
case NormalizedByteCode.__if_icmpeq:
case NormalizedByteCode.__if_icmpne:
case NormalizedByteCode.__if_icmplt:
case NormalizedByteCode.__if_icmpge:
case NormalizedByteCode.__if_icmpgt:
case NormalizedByteCode.__if_icmple:
case NormalizedByteCode.__if_acmpeq:
case NormalizedByteCode.__if_acmpne:
case NormalizedByteCode.__ifnull:
case NormalizedByteCode.__ifnonnull:
case NormalizedByteCode.__goto:
case NormalizedByteCode.__jsr:
{
int targetPC = m.Instructions[j].PC + m.Instructions[j].Arg1;
if(ei.start_pc < targetPC && targetPC < ei.end_pc)
{
ExceptionTableEntry en = new ExceptionTableEntry();
en.catch_type = ei.catch_type;
en.handler_pc = ei.handler_pc;
en.start_pc = (ushort)targetPC;
en.end_pc = ei.end_pc;
ei.end_pc = (ushort)targetPC;
ar.Insert(i + 1, en);
goto restart_jsr;
}
break;
}
}
}
}
}
// exception handlers are also a kind of jump, so we need to split try blocks around handlers as well
for(int i = 0; i < ar.Count; i++)
{
ExceptionTableEntry ei = (ExceptionTableEntry)ar[i];
for(int j = 0; j < ar.Count; j++)
{
ExceptionTableEntry ej = (ExceptionTableEntry)ar[j];
if(ei.start_pc < ej.handler_pc && ej.handler_pc < ei.end_pc)
{
ExceptionTableEntry en = new ExceptionTableEntry();
en.catch_type = ei.catch_type;
en.handler_pc = ei.handler_pc;
en.start_pc = ej.handler_pc;
en.end_pc = ei.end_pc;
ei.end_pc = ej.handler_pc;
ar.Insert(i + 1, en);
goto restart_jsr;
}
}
}
// filter out zero length try blocks
for(int i = 0; i < ar.Count; i++)
{
ExceptionTableEntry ei = (ExceptionTableEntry)ar[i];
if(ei.start_pc == ei.end_pc)
{
ar.RemoveAt(i);
i--;
}
else
{
// exception blocks that only contain harmless instructions (i.e. instructions that will *never* throw an exception)
// are also filtered out (to improve the quality of the generated code)
// NOTE we don't remove exception handlers that could catch ThreadDeath, because that can be thrown
// asynchronously (and thus appear on any instruction). This is particularly important to ensure that
// we run finally blocks when a thread is killed.
if(ei.catch_type != 0)
{
TypeWrapper exceptionType = classFile.GetConstantPoolClassType(ei.catch_type);
if(!exceptionType.IsUnloadable && !java_lang_ThreadDeath.IsAssignableTo(exceptionType))
{
int start = FindPcIndex(ei.start_pc);
int end = FindPcIndex(ei.end_pc);
for(int j = start; j < end; j++)
{
if(ByteCodeMetaData.CanThrowException(m.Instructions[j].NormalizedOpCode))
{
goto next;
}
}
ar.RemoveAt(i);
i--;
}
}
}
next:;
}
// Console.WriteLine("after processing:");
// foreach(ExceptionTableEntry e in ar)
// {
// Console.WriteLine("{0} to {1} handler {2}", e.start_pc, e.end_pc, e.handler_pc);
// }
exceptions = new ExceptionTableEntry[ar.Count];
ar.CopyTo(exceptions, 0);
for(int i = 0; i < exceptions.Length; i++)
{
exceptions[i].ordinal = i;
}
Array.Sort(exceptions, new ExceptionSorter());
// TODO remove these checks, if the above exception untangling is correct, this shouldn't ever
// be triggered
for(int i = 0; i < exceptions.Length; i++)
{
for(int j = i + 1; j < exceptions.Length; j++)
{
// check for partially overlapping try blocks (which is legal for the JVM, but not the CLR)
if(exceptions[i].start_pc < exceptions[j].start_pc &&
exceptions[j].start_pc < exceptions[i].end_pc &&
exceptions[i].end_pc < exceptions[j].end_pc)
{
throw new InvalidOperationException("Partially overlapping try blocks is broken");
}
// check that we didn't destroy the ordering, when sorting
if(exceptions[i].start_pc <= exceptions[j].start_pc &&
exceptions[i].end_pc >= exceptions[j].end_pc &&
exceptions[i].ordinal < exceptions[j].ordinal)
{
throw new InvalidOperationException("Non recursive try blocks is broken");
}
}
// make sure __jsr doesn't jump out of try block
for(int j = FindPcIndex(exceptions[i].start_pc), e = FindPcIndex(exceptions[i].end_pc); j < e; j++)
{
if(m.Instructions[j].NormalizedOpCode == NormalizedByteCode.__jsr)
{
int targetPC = m.Instructions[j].NormalizedArg1 + m.Instructions[j].PC;
if(targetPC < exceptions[i].start_pc || targetPC >= exceptions[i].end_pc)
{
throw new InvalidOperationException("Try block splitting around __jsr is broken");
}
}
}
}
}
private LocalBuilder UnsafeAllocTempLocal(Type type)
{
int free = -1;
for(int i = 0; i < tempLocals.Length; i++)
{
LocalBuilder lb = tempLocals[i];
if(lb == null)
{
if(free == -1)
{
free = i;
}
}
else if(lb.LocalType == type)
{
return lb;
}
}
LocalBuilder lb1 = ilGenerator.DeclareLocal(type);
if(free != -1)
{
tempLocals[free] = lb1;
}
return lb1;
}
private LocalBuilder AllocTempLocal(Type type)
{
for(int i = 0; i < tempLocals.Length; i++)
{
LocalBuilder lb = tempLocals[i];
if(lb != null && lb.LocalType == type)
{
tempLocals[i] = null;
return lb;
}
}
return ilGenerator.DeclareLocal(type);
}
private void ReleaseTempLocal(LocalBuilder lb)
{
for(int i = 0; i < tempLocals.Length; i++)
{
if(tempLocals[i] == null)
{
tempLocals[i] = lb;
break;
}
}
}
private sealed class ReturnCookie
{
private Label stub;
private LocalBuilder local;
internal ReturnCookie(Label stub, LocalBuilder local)
{
this.stub = stub;
this.local = local;
}
internal void EmitRet(ILGenerator ilgen)
{
ilgen.MarkLabel(stub);
if(local != null)
{
ilgen.Emit(OpCodes.Ldloc, local);
}
ilgen.Emit(OpCodes.Ret);
}
}
private sealed class BranchCookie
{
// NOTE Stub gets used for both the push stub (inside the exception block) as well as the pop stub (outside the block)
internal Label Stub;
internal Label TargetLabel;
internal bool ContentOnStack;
internal readonly int TargetPC;
internal DupHelper dh;
internal BranchCookie(Compiler compiler, int stackHeight, int targetPC)
{
this.Stub = compiler.ilGenerator.DefineLabel();
this.TargetPC = targetPC;
this.dh = new DupHelper(compiler, stackHeight);
}
internal BranchCookie(Label label, int targetPC)
{
this.Stub = label;
this.TargetPC = targetPC;
}
}
private struct DupHelper
{
private enum StackType : byte
{
Null,
New,
This,
UnitializedThis,
Other
}
private Compiler compiler;
private StackType[] types;
private LocalBuilder[] locals;
internal DupHelper(Compiler compiler, int count)
{
this.compiler = compiler;
types = new StackType[count];
locals = new LocalBuilder[count];
}
internal void Release()
{
foreach(LocalBuilder lb in locals)
{
if(lb != null)
{
compiler.ReleaseTempLocal(lb);
}
}
}
internal int Count
{
get
{
return types.Length;
}
}
internal void SetType(int i, TypeWrapper type)
{
if(type == VerifierTypeWrapper.Null)
{
types[i] = StackType.Null;
}
else if(VerifierTypeWrapper.IsNew(type))
{
// new objects aren't really there on the stack
types[i] = StackType.New;
}
else if(VerifierTypeWrapper.IsThis(type))
{
types[i] = StackType.This;
}
else if(type == VerifierTypeWrapper.UninitializedThis)
{
// uninitialized references cannot be stored in a local, but we can reload them
types[i] = StackType.UnitializedThis;
}
else
{
types[i] = StackType.Other;
locals[i] = compiler.AllocTempLocal(type.TypeAsLocalOrStackType);
}
}
internal void Load(int i)
{
switch(types[i])
{
case StackType.Null:
compiler.ilGenerator.Emit(OpCodes.Ldnull);
break;
case StackType.New:
// new objects aren't really there on the stack
break;
case StackType.This:
case StackType.UnitializedThis:
compiler.ilGenerator.Emit(OpCodes.Ldarg_0);
break;
case StackType.Other:
compiler.ilGenerator.Emit(OpCodes.Ldloc, locals[i]);
break;
default:
throw new InvalidOperationException();
}
}
internal void Store(int i)
{
switch(types[i])
{
case StackType.Null:
case StackType.This:
case StackType.UnitializedThis:
compiler.ilGenerator.Emit(OpCodes.Pop);
break;
case StackType.New:
// new objects aren't really there on the stack
break;
case StackType.Other:
compiler.ilGenerator.Emit(OpCodes.Stloc, locals[i]);
break;
default:
throw new InvalidOperationException();
}
}
}
internal static void Compile(DynamicTypeWrapper clazz, MethodWrapper mw, ClassFile classFile, ClassFile.Method m, ILGenerator ilGenerator, ref bool nonleaf, Hashtable invokespecialstubcache, ref LineNumberTableAttribute.LineNumberWriter lineNumberTable)
{
ClassLoaderWrapper classLoader = clazz.GetClassLoader();
ISymbolDocumentWriter symboldocument = null;
if(classLoader.EmitDebugInfo)
{
string sourcefile = classFile.SourceFileAttribute;
if(sourcefile != null)
{
if(classLoader.SourcePath != null)
{
string package = clazz.Name;
int index = package.LastIndexOf('.');
package = index == -1 ? "" : package.Substring(0, index).Replace('.', '/');
sourcefile = new System.IO.FileInfo(classLoader.SourcePath + "/" + package + "/" + sourcefile).FullName;
}
symboldocument = classLoader.GetTypeWrapperFactory().ModuleBuilder.DefineDocument(sourcefile, SymLanguageType.Java, Guid.Empty, SymDocumentType.Text);
// the very first instruction in the method must have an associated line number, to be able
// to step into the method in Visual Studio .NET
ClassFile.Method.LineNumberTableEntry[] table = m.LineNumberTableAttribute;
if(table != null)
{
int firstPC = int.MaxValue;
int firstLine = -1;
for(int i = 0; i < table.Length; i++)
{
if(table[i].start_pc < firstPC && table[i].line_number != 0)
{
firstLine = table[i].line_number;
firstPC = table[i].start_pc;
}
}
if(firstLine > 0)
{
ilGenerator.MarkSequencePoint(symboldocument, firstLine, 0, firstLine + 1, 0);
}
}
}
}
TypeWrapper[] args = mw.GetParameters();
for(int i = 0; i < args.Length; i++)
{
if(args[i].IsUnloadable)
{
Profiler.Count("EmitDynamicCast");
ilGenerator.Emit(OpCodes.Ldarg, (short)(i + (m.IsStatic ? 0 : 1)));
ilGenerator.Emit(OpCodes.Ldtoken, clazz.TypeAsTBD);
ilGenerator.Emit(OpCodes.Ldstr, args[i].Name);
ilGenerator.Emit(OpCodes.Call, ByteCodeHelperMethods.DynamicCast);
ilGenerator.Emit(OpCodes.Pop);
}
}
Compiler c;
try
{
Profiler.Enter("new Compiler");
try
{
c = new Compiler(clazz, mw, classFile, m, ilGenerator, classLoader, symboldocument, invokespecialstubcache);
}
finally
{
Profiler.Leave("new Compiler");
}
}
catch(VerifyError x)
{
Tracer.Error(Tracer.Verifier, x.ToString());
clazz.HasVerifyError = true;
// because in Java the method is only verified if it is actually called,
// we generate code here to throw the VerificationError
EmitHelper.Throw(ilGenerator, "java.lang.VerifyError", x.Message);
return;
}
catch(ClassFormatError x)
{
Tracer.Error(Tracer.Verifier, x.ToString());
clazz.HasClassFormatError = true;
EmitHelper.Throw(ilGenerator, "java.lang.ClassFormatError", x.Message);
return;
}
Profiler.Enter("Compile");
try
{
if(m.IsSynchronized && m.IsStatic)
{
ilGenerator.Emit(OpCodes.Ldsfld, clazz.ClassObjectField);
Label label = ilGenerator.DefineLabel();
ilGenerator.Emit(OpCodes.Brtrue_S, label);
ilGenerator.Emit(OpCodes.Ldtoken, clazz.TypeAsTBD);
getClassFromTypeHandle.EmitCall(ilGenerator);
ilGenerator.Emit(OpCodes.Stsfld, clazz.ClassObjectField);
ilGenerator.MarkLabel(label);
ilGenerator.Emit(OpCodes.Ldsfld, clazz.ClassObjectField);
ilGenerator.Emit(OpCodes.Dup);
LocalBuilder monitor = ilGenerator.DeclareLocal(typeof(object));
ilGenerator.Emit(OpCodes.Stloc, monitor);
ilGenerator.Emit(OpCodes.Call, monitorEnterMethod);
ilGenerator.BeginExceptionBlock();
Block b = new Block(c, 0, int.MaxValue, -1, new ArrayList(), true);
c.Compile(b);
b.Leave();
ilGenerator.BeginFinallyBlock();
ilGenerator.Emit(OpCodes.Ldloc, monitor);
ilGenerator.Emit(OpCodes.Call, monitorExitMethod);
ilGenerator.EndExceptionBlock();
b.LeaveStubs(new Block(c, 0, int.MaxValue, -1, null, false));
}
else
{
Block b = new Block(c, 0, int.MaxValue, -1, null, false);
c.Compile(b);
b.Leave();
}
if(c.lineNumbers != null)
{
for(int i = 0; i < m.Instructions.Length; i++)
{
if(m.Instructions[i].NormalizedOpCode == NormalizedByteCode.__getfield
&& VerifierTypeWrapper.IsThis(c.ma.GetRawStackTypeWrapper(i, 0)))
{
// loading a field from the current object cannot throw
}
else if(m.Instructions[i].NormalizedOpCode == NormalizedByteCode.__putfield
&& VerifierTypeWrapper.IsThis(c.ma.GetRawStackTypeWrapper(i, 1)))
{
// storing a field in the current object cannot throw
}
else if(m.Instructions[i].NormalizedOpCode == NormalizedByteCode.__getstatic
&& classFile.GetFieldref(m.Instructions[i].Arg1).GetClassType() == clazz)
{
// loading a field from the current class cannot throw
}
else if(m.Instructions[i].NormalizedOpCode == NormalizedByteCode.__putstatic
&& classFile.GetFieldref(m.Instructions[i].Arg1).GetClassType() == clazz)
{
// storing a field to the current class cannot throw
}
else if(ByteCodeMetaData.CanThrowException(m.Instructions[i].NormalizedOpCode))
{
lineNumberTable = c.lineNumbers;
break;
}
}
}
if((m.IsSynchronized && m.IsStatic) || c.exceptions.Length > 0)
{
// HACK because of the bogus Leave instruction that Reflection.Emit generates, this location
// sometimes appears reachable (it isn't), so we emit a bogus branch to keep the verifier happy.
//ilGenerator.Emit(OpCodes.Br, - (ilGenerator.GetILOffset() + 5));
ilGenerator.Emit(OpCodes.Br_S, (sbyte)-2);
}
ilGenerator.Finish();
nonleaf = c.nonleaf;
}
finally
{
Profiler.Leave("Compile");
}
}
private class Block
{
private Compiler compiler;
private ILGenerator ilgen;
private int begin;
private int end;
private int exceptionIndex;
private ArrayList exits;
private bool nested;
private object[] labels;
internal Block(Compiler compiler, int beginPC, int endPC, int exceptionIndex, ArrayList exits, bool nested)