public static bool Address(CilType fromType, CilType intoType, JavaCode code)
{
if (intoType.Equals(SpanType) && (!fromType.Equals(SpanType)))
{
// allow assignment of null to clear the pointer
if (fromType.Equals(JavaStackMap.Null))
{
return(true);
}
// allow assignment of native int (presumably zero)
bool callAssign = false;
bool pushNullType = true;
JavaType argType = fromType;
JavaType retType = SpanType;
if ((!fromType.IsReference) && fromType.PrimitiveType == TypeCode.UInt64)
{
callAssign = true;
}
else if (intoType.GenericParameters != null)
{
// allow assignment when the types match
callAssign = intoType.GenericParameters[0].Equals(fromType) ||
fromType.JavaName == intoType.GenericParameters[0].JavaName;
// for arbitrary value types, call a Assign(ValueType)
if (fromType.IsValueClass)
{
argType = retType = CilType.SystemValueType;
GenericUtil.LoadMaybeGeneric(fromType, code);
pushNullType = false;
}
}
if (callAssign)
{
if (pushNullType)
{
code.NewInstruction(0x01 /* aconst_null */, null, null);
code.StackMap.PushStack(CilType.SystemTypeType);
}
code.NewInstruction(0xB8 /* invokestatic */, SpanType,
new JavaMethodRef("Assign" + CilMain.EXCLAMATION,
retType, argType, CilType.SystemTypeType));
code.NewInstruction(0xC0 /* checkcast */, SpanType, null);
code.StackMap.PopStack(CilMain.Where); // null type
return(true);
}
throw new Exception($"bad assignment of '{fromType.JavaName}' into pointer of '{intoType.GenericParameters[0].JavaName}'");
}
return(false);
}
static bool EqualGenericParameter(CilType p1, CilType p2)
{
if (p1.IsGenericParameter)
{
return(p2.IsGenericParameter);
}
if (p1.HasGenericParameters)
{
if (p2.HasGenericParameters)
{
int n = p1.GenericParameters.Count;
if (n == p2.GenericParameters.Count)
{
for (int i = 0; i < n; i++)
{
if (!EqualGenericParameter(p1.GenericParameters[i],
p2.GenericParameters[i]))
{
return(false);
}
}
return(true);
}
}
return(false);
}
return(p1.Equals(p2));
}
public static bool LoadStore(bool isLoad, CilType stackTop, JavaType opcodeType,
CilType dataType, JavaCode code)
{
if (stackTop.Equals(SpanType) && code.Method.Class.Name != SpanType.ClassName)
{
string opcodeDescr;
if (opcodeType == null)
{
opcodeType = CilType.SystemValueType;
opcodeDescr = "";
// at this point we should have been called from LoadObject or
// StoreObject in CodeMisc to handle a ldobj/stobj instruction,
// so make sure the pointer-span element is a value type
if (dataType.IsGenericParameter || (!dataType.IsValueClass))
{
throw new InvalidProgramException();
}
code.NewInstruction(0x12 /* ldc */, dataType.AsWritableClass, null);
// make sure the stack has room for three parameters:
// 'this', value reference (in case of Store), and class
code.StackMap.PushStack(JavaType.ObjectType);
code.StackMap.PushStack(JavaType.ObjectType);
code.StackMap.PushStack(JavaType.ObjectType);
code.StackMap.PopStack(CilMain.Where);
code.StackMap.PopStack(CilMain.Where);
code.StackMap.PopStack(CilMain.Where);
}
else
{
if (opcodeType.Equals(JavaType.ShortType) &&
stackTop.GenericParameters != null &&
stackTop.GenericParameters[0].Equals(JavaType.CharacterType))
{
opcodeType = JavaType.CharacterType;
}
opcodeDescr = opcodeType.ToDescriptor();
}
var voidType = JavaType.VoidType;
var spanMethod = isLoad
? (new JavaMethodRef("Load" + opcodeDescr, opcodeType))
: (new JavaMethodRef("Store" + opcodeDescr, voidType, opcodeType));
if (opcodeDescr == "")
{
spanMethod.Parameters.Add(new JavaFieldRef("", JavaType.ClassType));
}
code.NewInstruction(0xB6 /* invokevirtual */, SpanType, spanMethod);
if (isLoad)
{
code.StackMap.PushStack(CilType.From(opcodeType));
}
return(true);
}
return(false);
}
bool LoadFieldValue(string fldName, CilType fldType, CilType fldClass,
bool isStatic, bool isVolatile)
{
if (isStatic && fldClass.HasGenericParameters)
{
fldClass = LoadStaticData(fldClass);
isStatic = false;
}
byte op;
if (!isStatic)
{
if (method.IsConstructor &&
LoadFieldInConstructor(fldName, fldType, fldClass))
{
return(true);
}
PopObjectAndLoadFromSpan(fldClass);
op = 0xB4; // getfield
}
else
{
op = 0xB2; // getstatic
}
code.NewInstruction(op, fldClass.AsWritableClass, new JavaFieldRef(fldName, fldType));
if (fldType is BoxedType boxedType)
{
boxedType.GetValue(code, isVolatile);
fldType = boxedType.UnboxedType;
if (fldType.IsReference)
{
if (fldType.IsGenericParameter && fldType.IsArray)
{
fldType = CodeArrays.GenericArrayType;
}
else if (!fldType.Equals(JavaType.ObjectType))
{
code.NewInstruction(0xC0 /* checkcast */, fldType.AsWritableClass, null);
}
}
}
else if (fldType.IsGenericParameter)
{
var newType = GenericUtil.CastMaybeGeneric(fldType, false, code);
fldType = (newType != fldType) ? newType : CilType.From(JavaType.ObjectType);
}
stackMap.PushStack(fldType);
return(true);
}
public static bool MaybeGetProxy(CilType fromType, CilType intoType, JavaCode code)
{
if (fromType.IsArray ||
object.ReferenceEquals(fromType, GenericArrayType) ||
fromType.Equals(JavaType.StringType))
{
if (GenericUtil.ShouldCallGenericCast(fromType, intoType))
{
code.NewInstruction(0xB8 /* invokestatic */,
SystemArrayType, GetProxyMethod);
return(true);
}
}
return(false);
}
public bool EqualParameters(CilInterfaceMethod other)
{
if (!ReturnType.Equals(other.ReturnType))
{
return(false);
}
int n = Parameters.Count;
if (other.Parameters.Count != n)
{
return(false);
}
for (int i = 0; i < n; i++)
{
if (!Parameters[i].Equals(other.Parameters[i]))
{
return(false);
}
}
return(true);
}
public static bool AddressArray(CilType elemType, CilType spanType, JavaCode code)
{
if (spanType != null && spanType.Equals(SpanType) &&
elemType.ArrayRank == 0 && (!elemType.Equals(SpanType)))
{
GenericUtil.LoadMaybeGeneric(elemType, code);
code.NewInstruction(0xB8 /* invokestatic */, SpanType,
new JavaMethodRef("AssignArray" + CilMain.EXCLAMATION,
CilType.SystemValueType, JavaType.ObjectType,
JavaType.IntegerType, CilType.SystemTypeType));
code.NewInstruction(0xC0 /* checkcast */, SpanType, null);
code.StackMap.PopStack(CilMain.Where); // type argument
code.StackMap.PushStack(spanType);
return(true);
}
return(false);
}
public static bool ShouldCallGenericCast(CilType fromType, CilType intoType)
{
if (object.ReferenceEquals(fromType, intoType))
{
return(false); // no, if same type (by reference)
}
if (intoType.PrimitiveType != 0 || intoType.ArrayRank != 0)
{
return(false); // no, if casting to primitive or array
}
if (intoType.HasGenericParameters)
{
if (intoType.Equals(CodeSpan.SpanType))
{
return(false);
}
return(true); // yes, if type is generic
}
if (fromType.Equals(intoType))
{
return(false); // no, if same type (by value)
}
// if casting to one of the non-generic types of that a string
// implements, and the source is either a string or an object
bool fromTypeIsObjectType = fromType.Equals(JavaType.ObjectType);
if ((fromTypeIsObjectType || fromType.Equals(JavaType.StringType)) &&
(intoType.JavaName == "system.IComparable" ||
intoType.JavaName == "system.IConvertible"))
{
return(true);
}
// if casting to one of the types that any array should implememt,
// and the castee is an array, or 'object', or one of those types,
// then always call TestCast/CallCast, because we might have to
// create a helper proxy for an array object
bool fromTypeMayBeArray = (fromTypeIsObjectType ||
fromType.ArrayRank != 0 ||
IsArray(fromType.JavaName));
return(fromTypeMayBeArray && IsArray(intoType.JavaName));
bool IsArray(string clsnm) => (
clsnm == "system.Array" ||
clsnm == "system.ICloneable" ||
clsnm == "system.collections.IEnumerable" ||
clsnm == "system.collections.ICollection" ||
clsnm == "system.collections.IList" ||
clsnm == "system.collections.IStructuralComparable" ||
clsnm == "system.collections.IStructuralEquatable");
#if false
// if casting to an array, from System.Object, System.Array,
// or one of the interface types that any array should implement,
// then always call TestCast/CallCast, because we might have to
// "unbox" the proxy (see below), and extract the array
if (intoType.ArrayRank != 0)
{
if (fromType.ArrayRank != 0)
{
return(false); // no, if casting from array to array
}
if (fromType.Equals(JavaType.ObjectType) ||
IsArray(fromType.JavaName) ||
IsGenericArray(fromType.JavaName))
{
return(true); // yes, if casting
}
}
bool IsGenericArray(string clsnm) => (
clsnm == "system.collections.generic.IEnumerable$$1" ||
clsnm == "system.collections.generic.ICollection$$1" ||
clsnm == "system.collections.generic.IList$$1" ||
clsnm == "system.collections.generic.IReadOnlyList$$1");
#endif
}
bool LoadFieldInConstructor(string fldName, CilType fldType, CilType fldClass)
{
// Java does not allow 'getfield' instructions on an 'uninitializedThis'
// until the call to super constructor. but in .Net this is permitted,
// and the F# compiler generates such code in some cases. we try to work
// around this, by identifying the constructor parameter that was used in
// an earlier 'putfield', and loading that, instead of doing 'getfield'.
bool isUninitializedThisField =
(method.IsConstructor && fldClass.Equals(method.DeclType) &&
stackMap.GetLocal(0).Equals(JavaStackMap.UninitializedThis));
if (!isUninitializedThisField)
{
return(false);
}
// most recent instruction before the 'getfield'
// should have been 'ldarg.0', translated to 'aload_0'
int i = code.Instructions.Count - 1;
if (i > 0 && code.Instructions[i].Opcode == 0x19 && /* aload */
code.Instructions[i].Data is int thisIndex &&
thisIndex == 0
// note that we pop the stack here
&& code.StackMap.PopStack(CilMain.Where)
.Equals(JavaStackMap.UninitializedThis))
{
// try to find an earlier 'putfield' instruction for the field
while (i-- > 0)
{
var inst = code.Instructions[i];
if (inst.Opcode == 0xB5 && /* putfield */
method.DeclType.Equals(inst.Class))
{
var instField = (JavaFieldRef)inst.Data;
if (fldName == instField.Name &&
fldType.Equals(instField.Type))
{
// try to find the load instruction that was used
// to load the value, for that earlier 'putfield'
if (FindLoadLocal(i - 1, code.Instructions.Count - 1))
{
return(true);
}
}
}
}
}
throw new Exception("load from uninitialized this");
bool FindLoadLocal(int prevIdx, int lastIdx)
{
var prevInst = code.Instructions[prevIdx];
if (prevIdx > 0 && prevInst.Opcode == 0xB8 && /* invokestatic */
(JavaMethodRef)prevInst.Data is JavaMethodRef prevMethod)
{
if (prevMethod.Name == "Box")
{
// we possibly found the sequence used in boxing -
// xload value, invokestatic Value.Box(), putfield
prevInst = code.Instructions[prevIdx - 1];
}
else if (prevIdx > 5 && prevMethod.Name == "Copy" &&
code.Instructions[prevIdx - 1].Opcode == 0x5A && /* dup_x1 */
code.Instructions[prevIdx - 2].Opcode == 0xB8 && /* invokestatic */
code.Instructions[prevIdx - 3].Opcode == 0x19 && /* aload (type) */
code.Instructions[prevIdx - 4].Opcode == 0xB8 && /* invokestatic */
code.Instructions[prevIdx - 5].Opcode == 0x19 /* aload (value) */)
{
// we possibly found the sequence used in generics -
// aload (local to use for store value)
// invokestatic Generic.Load
// aload (generic type parameter)
// invokestatic Generic.New
// dup_x1
// invokestatic Generic.Copy <=== prevIdx
// putfield
// (see also StoreInstance method in this module)
prevInst = code.Instructions[prevIdx - 5];
}
}
if (prevInst.Opcode >= 0x15 && /* iload, lload, fload, */
prevInst.Opcode <= 0x19 && /* dload, aload */
prevInst.Data is int localIndex)
{
// if the instruction before the 'putfield' is a load
// from local, and assuming this local is a parameter,
// then we can just load this local again, to replace
// a 'getfield' instruction that cannot access 'this'
code.Instructions[lastIdx].Opcode = prevInst.Opcode;
code.Instructions[lastIdx].Data = localIndex;
stackMap.PushStack(code.StackMap.GetLocal(localIndex));
return(true);
}
return(false);
}
}
bool ConvertVirtualToStaticCall(CilType callClass, CilMethod callMethod)
{
if (callClass.ClassName == callClass.JavaName)
{
if (callClass.ClassName == "system.FunctionalInterfaceDelegate" &&
callMethod.Name == "AsInterface")
{
// a call to system.FunctionalInterfaceDelegate::AsInterface()
// should be fixed to expect an 'object' return type, and then
// cast that return type to the proper interface
var tempMethod = new JavaMethodRef(callMethod.Name, JavaType.ObjectType);
code.NewInstruction(0xB6 /* invokevirtual */, callClass, tempMethod);
code.NewInstruction(0xC0 /* checkcast */, callMethod.ReturnType, null);
stackMap.PopStack(CilMain.Where);
stackMap.PushStack(callMethod.ReturnType);
return(true);
}
if (callMethod.IsExternal &&
NativeMethodClasses.TryGetValue(callClass.ClassName,
out var altClassName))
{
// a call to an instance method System.NameSpace.Class::Method,
// which is implemented only as a native method, is translated
// into a static call to some other class where the method is
// implemented. such implementing classes are listed in the
// NativeMethodClasses dictionary the bottom of this file.
var altMethodName = callMethod.Name;
int altMethodNameIdx = altMethodName.IndexOf(CilMain.OPEN_PARENS);
if (altMethodNameIdx != -1)
{
altMethodName = altMethodName.Substring(0, altMethodNameIdx);
}
var tempMethod = new JavaMethodRef(altMethodName, callMethod.ReturnType);
var parameters = new List <JavaFieldRef>(callMethod.Parameters);
parameters.Insert(0, new JavaFieldRef("this", callClass));
tempMethod.Parameters = parameters;
code.NewInstruction(0xB8 /* invokestatic */,
new JavaType(0, 0, altClassName), tempMethod);
ClearMethodArguments(callMethod, false);
PushMethodReturnType(callMethod);
return(true);
}
// don't bother adjusting the call if the program explicitly
// refers to the java class rather than the simulated wrapper,
// e.g. to java.lang.Throwable rather than System.Exception
return(false);
}
if (callClass.Equals(JavaType.StringType) ||
callClass.Equals(JavaType.ThrowableType) ||
(callClass.Equals(JavaType.ObjectType) &&
callMethod.Name == "GetType" &&
callMethod.ToDescriptor() == "()Lsystem/Type;"))
{
// we map some basic .Net types their java counterparts, so we
// can't invoke .Net instance methods on them directly. instead,
// we invoke a static method on our helper class. for example:
// ((System.String)x).CompareTo(y) -> system.String.CompareTo(x,y)
var tempMethod = new JavaMethodRef(callMethod.Name, callMethod.ReturnType);
var parameters = new List <JavaFieldRef>(callMethod.Parameters);
parameters.Insert(0, new JavaFieldRef("this", callClass));
tempMethod.Parameters = parameters;
if (callClass.Equals(JavaType.ThrowableType) &&
callMethod.Name == "system-Exception-GetType")
{
// undo the effect of CilMethod::MethodIsShadowing upon calling
// the virtual/overriding GetType() from System.Exception, and
// instead call the static system.Object.GetType()
tempMethod.Name = "GetType";
callClass = CilType.From(new JavaType(0, 0, "system.Object"));
parameters[0].Type = JavaType.ObjectType;
}
else
{
CilMethod.FixNameForVirtualToStaticCall(tempMethod, callClass);
}
code.NewInstruction(0xB8 /* invokestatic */,
new JavaType(0, 0, callClass.JavaName), tempMethod);
ClearMethodArguments(callMethod, false);
PushMethodReturnType(callMethod);
return(true);
}
if (callClass.JavaName == null &&
callClass.Equals(JavaType.ClassType) &&
callMethod.Name == "GetRuntimeType")
{
// convert virtual call to RuntimeTypeHandle.GetRuntimeType
// to a static call to system.RuntimeType
code.NewInstruction(0xB8 /* invokestatic */,
CilType.SystemRuntimeTypeType,
new JavaMethodRef(
callMethod.Name, callMethod.ReturnType,
JavaType.ObjectType));
ClearMethodArguments(callMethod, false);
PushMethodReturnType(callMethod);
return(true);
}
return(false);
}
