private static bool Object_getClass(EmitIntrinsicContext eic)
{
// this is the null-check idiom that javac uses (both in its own source and in the code it generates)
if (eic.MatchRange(0, 2) &&
eic.Match(1, NormalizedByteCode.__pop))
{
eic.Emitter.Emit(OpCodes.Dup);
eic.Emitter.EmitNullCheck();
return(true);
}
// this optimizes obj1.getClass() ==/!= obj2.getClass()
else if (eic.MatchRange(0, 4) &&
eic.Match(1, NormalizedByteCode.__aload) &&
eic.Match(2, NormalizedByteCode.__invokevirtual) &&
(eic.Match(3, NormalizedByteCode.__if_acmpeq) || eic.Match(3, NormalizedByteCode.__if_acmpne)) &&
(IsSafeForGetClassOptimization(eic.GetStackTypeWrapper(0, 0)) || IsSafeForGetClassOptimization(eic.GetStackTypeWrapper(2, 0))))
{
ClassFile.ConstantPoolItemMI cpi = eic.GetMethodref(2);
if (cpi.Class == "java.lang.Object" && cpi.Name == "getClass" && cpi.Signature == "()Ljava.lang.Class;")
{
// we can't patch the current opcode, so we have to emit the first call to GetTypeHandle here
eic.Emitter.Emit(OpCodes.Callvirt, Compiler.getTypeMethod);
eic.PatchOpCode(2, NormalizedByteCode.__intrinsic_gettype);
return(true);
}
}
return(false);
}
// this intrinsifies the unsafe.objectFieldOffset(XXX.class.getDeclaredField("xxx")) pattern
// to avoid initializing the full reflection machinery at this point
private static bool Class_getDeclaredField(EmitIntrinsicContext eic)
{
// validate that we're inside the XXX class and that xxx is an instance field of that class
if (eic.MatchRange(-2, 4) &&
eic.Match(-2, NormalizedByteCode.__ldc) && eic.GetClassLiteral(-2) == eic.Caller.DeclaringType &&
eic.Match(-1, NormalizedByteCode.__ldc_nothrow) &&
eic.Match(1, NormalizedByteCode.__invokevirtual))
{
FieldWrapper field = null;
string fieldName = eic.GetStringLiteral(-1);
foreach (FieldWrapper fw in eic.Caller.DeclaringType.GetFields())
{
if (fw.Name == fieldName)
{
if (field != null)
{
return(false);
}
field = fw;
}
}
if (field == null || field.IsStatic)
{
return(false);
}
ClassFile.ConstantPoolItemMI cpi = eic.GetMethodref(1);
if (cpi.Class == "sun.misc.Unsafe" && cpi.Name == "objectFieldOffset" && cpi.Signature == "(Ljava.lang.reflect.Field;)J")
{
MethodWrapper mw = ClassLoaderWrapper.LoadClassCritical("sun.misc.Unsafe")
.GetMethodWrapper("objectFieldOffset", "(Ljava.lang.Class;Ljava.lang.String;)J", false);
mw.Link();
mw.EmitCallvirt(eic.Emitter);
eic.PatchOpCode(1, NormalizedByteCode.__nop);
return(true);
}
}
return(false);
}
private static bool Class_desiredAssertionStatus(EmitIntrinsicContext eic)
{
if (eic.MatchRange(-1, 2) &&
eic.Match(-1, NormalizedByteCode.__ldc))
{
TypeWrapper classLiteral = eic.GetClassLiteral(-1);
if (!classLiteral.IsUnloadable && classLiteral.GetClassLoader().RemoveAsserts)
{
eic.Emitter.Emit(OpCodes.Pop);
eic.Emitter.Emit_Ldc_I4(0);
return(true);
}
}
return(false);
}
private static bool String_toCharArray(EmitIntrinsicContext eic)
{
if (eic.MatchRange(-1, 2) &&
eic.Match(-1, NormalizedByteCode.__ldc))
{
string str = eic.ClassFile.GetConstantPoolConstantString(eic.Code[eic.OpcodeIndex - 1].Arg1);
// arbitrary length for "big" strings
if (str.Length > 128)
{
eic.Emitter.Emit(OpCodes.Pop);
EmitLoadCharArrayLiteral(eic.Emitter, str, eic.Caller.DeclaringType);
return(true);
}
}
return(false);
}
private static bool Unsafe_ensureClassInitialized(EmitIntrinsicContext eic)
{
if (eic.MatchRange(-1, 2) &&
eic.Match(-1, NormalizedByteCode.__ldc))
{
TypeWrapper classLiteral = eic.GetClassLiteral(-1);
if (!classLiteral.IsUnloadable)
{
eic.Emitter.Emit(OpCodes.Pop);
eic.Emitter.EmitNullCheck();
classLiteral.EmitRunClassConstructor(eic.Emitter);
return(true);
}
}
return(false);
}
private static bool String_toCharArray(EmitIntrinsicContext eic)
{
if (eic.MatchRange(-1, 2) &&
eic.Match(-1, NormalizedByteCode.__ldc_nothrow))
{
string str = eic.GetStringLiteral(-1);
// arbitrary length for "big" strings
if (str.Length > 128)
{
eic.Emitter.Emit(OpCodes.Pop);
EmitLoadCharArrayLiteral(eic.Emitter, str, eic.Caller.DeclaringType);
return(true);
}
}
return(false);
}
private static bool Object_getClass(EmitIntrinsicContext eic)
{
// this is the null-check idiom that javac uses (both in its own source and in the code it generates)
if (eic.MatchRange(0, 2) &&
eic.Match(1, NormalizedByteCode.__pop))
{
eic.Emitter.Emit(OpCodes.Dup);
eic.Emitter.EmitNullCheck();
return(true);
}
// this optimizes obj1.getClass() ==/!= obj2.getClass()
else if (eic.MatchRange(0, 4) &&
eic.Match(1, NormalizedByteCode.__aload) &&
eic.Match(2, NormalizedByteCode.__invokevirtual) &&
(eic.Match(3, NormalizedByteCode.__if_acmpeq) || eic.Match(3, NormalizedByteCode.__if_acmpne)) &&
(IsSafeForGetClassOptimization(eic.GetStackTypeWrapper(0, 0)) || IsSafeForGetClassOptimization(eic.GetStackTypeWrapper(2, 0))))
{
ClassFile.ConstantPoolItemMI cpi = eic.GetMethodref(2);
if (cpi.Class == "java.lang.Object" && cpi.Name == "getClass" && cpi.Signature == "()Ljava.lang.Class;")
{
// we can't patch the current opcode, so we have to emit the first call to GetTypeHandle here
eic.Emitter.Emit(OpCodes.Callvirt, Compiler.getTypeMethod);
eic.PatchOpCode(2, NormalizedByteCode.__intrinsic_gettype);
return(true);
}
}
// this optimizes obj.getClass() == Xxx.class
else if (eic.MatchRange(0, 3) &&
eic.Match(1, NormalizedByteCode.__ldc) && eic.GetConstantType(1) == ClassFile.ConstantType.Class &&
(eic.Match(2, NormalizedByteCode.__if_acmpeq) || eic.Match(2, NormalizedByteCode.__if_acmpne)))
{
TypeWrapper tw = eic.GetClassLiteral(1);
if (tw.IsGhost || tw.IsGhostArray || tw.IsUnloadable || (tw.IsRemapped && tw.IsFinal && tw is DotNetTypeWrapper))
{
return(false);
}
eic.Emitter.Emit(OpCodes.Callvirt, Compiler.getTypeMethod);
eic.Emitter.Emit(OpCodes.Ldtoken, (tw.IsRemapped && tw.IsFinal) ? tw.TypeAsTBD : tw.TypeAsBaseType);
eic.Emitter.Emit(OpCodes.Call, Compiler.getTypeFromHandleMethod);
eic.PatchOpCode(1, NormalizedByteCode.__nop);
return(true);
}
return(false);
}
private static bool Reflection_getCallerClass(EmitIntrinsicContext eic)
{
if (eic.Caller.HasCallerID &&
eic.MatchRange(-1, 2) &&
eic.Match(-1, NormalizedByteCode.__iconst, 2))
{
eic.Emitter.Emit(OpCodes.Pop);
int arg = eic.Caller.GetParametersForDefineMethod().Length - 1;
if (!eic.Caller.IsStatic)
{
arg++;
}
eic.Emitter.Emit(OpCodes.Ldarg, (short)arg);
MethodWrapper mw = [email protected]("getCallerClass", "()Ljava.lang.Class;", false);
mw.Link();
mw.EmitCallvirt(eic.Emitter);
return(true);
}
return(false);
}
private static bool Util_getInstanceTypeFromClass(EmitIntrinsicContext eic)
{
if (eic.MatchRange(-1, 2) &&
eic.Match(-1, NormalizedByteCode.__ldc))
{
TypeWrapper tw = eic.GetClassLiteral(-1);
if (!tw.IsUnloadable)
{
eic.Emitter.Emit(OpCodes.Pop);
if (tw.IsRemapped && tw.IsFinal)
{
eic.Emitter.Emit(OpCodes.Ldtoken, tw.TypeAsTBD);
}
else
{
eic.Emitter.Emit(OpCodes.Ldtoken, tw.TypeAsBaseType);
}
eic.Emitter.Emit(OpCodes.Call, Compiler.getTypeFromHandleMethod);
return(true);
}
}
return(false);
}
private static bool Unsafe_compareAndSwapObject(EmitIntrinsicContext eic)
{
TypeWrapper tw = eic.GetStackTypeWrapper(0, 3);
if (IsSupportedArrayTypeForUnsafeOperation(tw) &&
eic.GetStackTypeWrapper(0, 0).IsAssignableTo(tw.ElementTypeWrapper) &&
eic.GetStackTypeWrapper(0, 1).IsAssignableTo(tw.ElementTypeWrapper))
{
Type type = tw.TypeAsLocalOrStackType.GetElementType();
CodeEmitterLocal update = eic.Emitter.AllocTempLocal(type);
CodeEmitterLocal expect = eic.Emitter.AllocTempLocal(type);
CodeEmitterLocal index = eic.Emitter.AllocTempLocal(Types.Int32);
CodeEmitterLocal obj = eic.Emitter.AllocTempLocal(tw.TypeAsLocalOrStackType);
eic.Emitter.Emit(OpCodes.Stloc, update);
eic.Emitter.Emit(OpCodes.Stloc, expect);
eic.Emitter.Emit(OpCodes.Conv_Ovf_I4);
eic.Emitter.Emit(OpCodes.Stloc, index);
eic.Emitter.Emit(OpCodes.Stloc, obj);
EmitConsumeUnsafe(eic);
eic.Emitter.Emit(OpCodes.Ldloc, obj);
eic.Emitter.Emit(OpCodes.Ldloc, index);
eic.Emitter.Emit(OpCodes.Ldelema, type);
eic.Emitter.Emit(OpCodes.Ldloc, update);
eic.Emitter.Emit(OpCodes.Ldloc, expect);
eic.Emitter.Emit(OpCodes.Call, AtomicReferenceFieldUpdaterEmitter.MakeCompareExchange(type));
eic.Emitter.Emit(OpCodes.Ldloc, expect);
eic.Emitter.Emit(OpCodes.Ceq);
eic.Emitter.ReleaseTempLocal(obj);
eic.Emitter.ReleaseTempLocal(index);
eic.Emitter.ReleaseTempLocal(expect);
eic.Emitter.ReleaseTempLocal(update);
eic.NonLeaf = false;
return(true);
}
if ((eic.Flags[eic.OpcodeIndex] & InstructionFlags.BranchTarget) != 0 ||
(eic.Flags[eic.OpcodeIndex - 1] & InstructionFlags.BranchTarget) != 0 ||
(eic.Flags[eic.OpcodeIndex - 2] & InstructionFlags.BranchTarget) != 0)
{
return(false);
}
if ((eic.Match(-1, NormalizedByteCode.__aload) || eic.Match(-1, NormalizedByteCode.__aconst_null)) &&
(eic.Match(-2, NormalizedByteCode.__aload) || eic.Match(-2, NormalizedByteCode.__aconst_null)) &&
eic.Match(-3, NormalizedByteCode.__getstatic))
{
FieldWrapper fw = GetUnsafeField(eic, eic.GetFieldref(-3));
if (fw != null &&
fw.IsAccessibleFrom(fw.DeclaringType, eic.Caller.DeclaringType, fw.DeclaringType) &&
eic.GetStackTypeWrapper(0, 0).IsAssignableTo(fw.FieldTypeWrapper) &&
eic.GetStackTypeWrapper(0, 1).IsAssignableTo(fw.FieldTypeWrapper) &&
(fw.IsStatic || fw.DeclaringType == eic.GetStackTypeWrapper(0, 3)))
{
Type type = fw.FieldTypeWrapper.TypeAsLocalOrStackType;
CodeEmitterLocal update = eic.Emitter.AllocTempLocal(type);
CodeEmitterLocal expect = eic.Emitter.AllocTempLocal(type);
eic.Emitter.Emit(OpCodes.Stloc, update);
eic.Emitter.Emit(OpCodes.Stloc, expect);
eic.Emitter.Emit(OpCodes.Pop); // discard index
if (fw.IsStatic)
{
eic.Emitter.Emit(OpCodes.Pop); // discard obj
EmitConsumeUnsafe(eic);
eic.Emitter.Emit(OpCodes.Ldsflda, fw.GetField());
}
else
{
CodeEmitterLocal obj = eic.Emitter.AllocTempLocal(eic.Caller.DeclaringType.TypeAsLocalOrStackType);
eic.Emitter.Emit(OpCodes.Stloc, obj);
EmitConsumeUnsafe(eic);
eic.Emitter.Emit(OpCodes.Ldloc, obj);
eic.Emitter.ReleaseTempLocal(obj);
eic.Emitter.Emit(OpCodes.Ldflda, fw.GetField());
}
eic.Emitter.Emit(OpCodes.Ldloc, update);
eic.Emitter.Emit(OpCodes.Ldloc, expect);
eic.Emitter.Emit(OpCodes.Call, AtomicReferenceFieldUpdaterEmitter.MakeCompareExchange(type));
eic.Emitter.Emit(OpCodes.Ldloc, expect);
eic.Emitter.Emit(OpCodes.Ceq);
eic.Emitter.ReleaseTempLocal(expect);
eic.Emitter.ReleaseTempLocal(update);
eic.NonLeaf = false;
return(true);
}
}
return(false);
}
private static bool Unsafe_putObjectImpl(EmitIntrinsicContext eic, bool membarrier)
{
TypeWrapper tw = eic.GetStackTypeWrapper(0, 2);
if (IsSupportedArrayTypeForUnsafeOperation(tw) &&
eic.GetStackTypeWrapper(0, 0).IsAssignableTo(tw.ElementTypeWrapper))
{
CodeEmitterLocal value = eic.Emitter.AllocTempLocal(tw.ElementTypeWrapper.TypeAsLocalOrStackType);
CodeEmitterLocal index = eic.Emitter.AllocTempLocal(Types.Int32);
CodeEmitterLocal array = eic.Emitter.AllocTempLocal(tw.TypeAsLocalOrStackType);
eic.Emitter.Emit(OpCodes.Stloc, value);
eic.Emitter.Emit(OpCodes.Conv_Ovf_I4);
eic.Emitter.Emit(OpCodes.Stloc, index);
eic.Emitter.Emit(OpCodes.Stloc, array);
EmitConsumeUnsafe(eic);
eic.Emitter.Emit(OpCodes.Ldloc, array);
eic.Emitter.Emit(OpCodes.Ldloc, index);
eic.Emitter.Emit(OpCodes.Ldloc, value);
eic.Emitter.ReleaseTempLocal(array);
eic.Emitter.ReleaseTempLocal(index);
eic.Emitter.ReleaseTempLocal(value);
eic.Emitter.Emit(OpCodes.Stelem_Ref);
if (membarrier)
{
eic.Emitter.EmitMemoryBarrier();
}
eic.NonLeaf = false;
return(true);
}
if ((eic.Flags[eic.OpcodeIndex] & InstructionFlags.BranchTarget) != 0 ||
(eic.Flags[eic.OpcodeIndex - 1] & InstructionFlags.BranchTarget) != 0)
{
return(false);
}
if ((eic.Match(-1, NormalizedByteCode.__aload) || eic.Match(-1, NormalizedByteCode.__aconst_null)) &&
eic.Match(-2, NormalizedByteCode.__getstatic))
{
FieldWrapper fw = GetUnsafeField(eic, eic.GetFieldref(-2));
if (fw != null &&
(!fw.IsFinal || (!fw.IsStatic && eic.Caller.Name == "<init>") || (fw.IsStatic && eic.Caller.Name == "<clinit>")) &&
fw.IsAccessibleFrom(fw.DeclaringType, eic.Caller.DeclaringType, fw.DeclaringType) &&
eic.GetStackTypeWrapper(0, 0).IsAssignableTo(fw.FieldTypeWrapper) &&
(fw.IsStatic || fw.DeclaringType == eic.GetStackTypeWrapper(0, 2)))
{
CodeEmitterLocal value = eic.Emitter.AllocTempLocal(fw.FieldTypeWrapper.TypeAsLocalOrStackType);
eic.Emitter.Emit(OpCodes.Stloc, value);
eic.Emitter.Emit(OpCodes.Pop); // discard offset field
if (fw.IsStatic)
{
eic.Emitter.Emit(OpCodes.Pop); // discard object
EmitConsumeUnsafe(eic);
}
else
{
CodeEmitterLocal obj = eic.Emitter.AllocTempLocal(fw.DeclaringType.TypeAsLocalOrStackType);
eic.Emitter.Emit(OpCodes.Stloc, obj);
EmitConsumeUnsafe(eic);
eic.Emitter.Emit(OpCodes.Ldloc, obj);
eic.Emitter.ReleaseTempLocal(obj);
}
eic.Emitter.Emit(OpCodes.Ldloc, value);
eic.Emitter.ReleaseTempLocal(value);
// note that we assume the CLR memory model where all writes are ordered,
// so we don't need a volatile store or a memory barrier and putOrderedObject
// is typically used with a volatile field, so to avoid the memory barrier,
// we don't use FieldWrapper.EmitSet(), but emit the store directly
eic.Emitter.Emit(fw.IsStatic ? OpCodes.Stsfld : OpCodes.Stfld, fw.GetField());
if (membarrier)
{
eic.Emitter.EmitMemoryBarrier();
}
eic.NonLeaf = false;
return(true);
}
}
return(false);
}
// this intrinsifies the following two patterns:
// unsafe.objectFieldOffset(XXX.class.getDeclaredField("xxx"));
// and
// Class k = XXX.class;
// unsafe.objectFieldOffset(k.getDeclaredField("xxx"));
// to avoid initializing the full reflection machinery at this point
private static bool Class_getDeclaredField(EmitIntrinsicContext eic)
{
if (eic.Caller.DeclaringType.GetClassLoader() != CoreClasses.java.lang.Object.Wrapper.GetClassLoader())
{
// we can only do this optimization when compiling the trusted core classes
return(false);
}
TypeWrapper fieldClass;
if (eic.MatchRange(-2, 4) &&
eic.Match(-2, NormalizedByteCode.__ldc) &&
eic.Match(-1, NormalizedByteCode.__ldc_nothrow) &&
eic.Match(1, NormalizedByteCode.__invokevirtual))
{
// unsafe.objectFieldOffset(XXX.class.getDeclaredField("xxx"));
fieldClass = eic.GetClassLiteral(-2);
}
else if (eic.MatchRange(-5, 7) &&
eic.Match(-5, NormalizedByteCode.__ldc) &&
eic.Match(-4, NormalizedByteCode.__astore) &&
eic.Match(-3, NormalizedByteCode.__getstatic) &&
eic.Match(-2, NormalizedByteCode.__aload, eic.Code[eic.OpcodeIndex - 4].NormalizedArg1) &&
eic.Match(-1, NormalizedByteCode.__ldc_nothrow) &&
eic.Match(1, NormalizedByteCode.__invokevirtual))
{
// Class k = XXX.class;
// unsafe.objectFieldOffset(k.getDeclaredField("xxx"));
fieldClass = eic.GetClassLiteral(-5);
}
else
{
return(false);
}
FieldWrapper field = null;
string fieldName = eic.GetStringLiteral(-1);
foreach (FieldWrapper fw in fieldClass.GetFields())
{
if (fw.Name == fieldName)
{
if (field != null)
{
return(false);
}
field = fw;
}
}
if (field == null || field.IsStatic)
{
return(false);
}
ClassFile.ConstantPoolItemMI cpi = eic.GetMethodref(1);
if (cpi.Class == "sun.misc.Unsafe" && cpi.Name == "objectFieldOffset" && cpi.Signature == "(Ljava.lang.reflect.Field;)J")
{
MethodWrapper mw = ClassLoaderWrapper.LoadClassCritical("sun.misc.Unsafe")
.GetMethodWrapper("objectFieldOffset", "(Ljava.lang.Class;Ljava.lang.String;)J", false);
mw.Link();
mw.EmitCallvirt(eic.Emitter);
eic.PatchOpCode(1, NormalizedByteCode.__nop);
return(true);
}
return(false);
}
