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);
}
// 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);
}
// 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);
}
