// slang-intrinsic-expand.cpp
#include "slang-intrinsic-expand.h"

#include "slang-emit-cuda.h"

namespace Slang {

void IntrinsicExpandContext::emit(IRCall* inst, IRUse* args, Int argCount, const UnownedStringSlice& intrinsicText)
{
    m_args = args;
    m_argCount = argCount;
    m_text = intrinsicText;
    m_callInst = inst;

    const auto returnType = inst->getDataType();

    // If it returns void -> then we don't need parenthesis 
    if (as<IRVoidType>(returnType) == nullptr)
    {
        m_writer->emit("(");
        m_openParenCount++;
    }

    {
        char const* spanStart = intrinsicText.begin();
        char const* cursor = spanStart;
        char const* end = intrinsicText.end();

        while (cursor < end)
        {
            // Indicates the start of a 'special' sequence
            if (*cursor == '$')
            {
                // Flush any chars not yet output
                if (spanStart < cursor)
                {
                    m_writer->emit(spanStart, cursor);
                }

                // Requires special processing for output (ie we don't just copy chars verbatim)
                cursor = _emitSpecial(cursor);
                // The start is now after 'special' handling
                spanStart = cursor;
            }
            else
            {
                cursor++;
            }
        }

        // Flush any non escaped
        if (spanStart < end)
        {
            m_writer->emit(spanStart, end);
        }
    }

    // Close any remaining open parens
    for (Index i = 0; i < m_openParenCount; ++i)
    {
        m_writer->emit(")");
    }
}

static BaseType _getBaseTypeFromScalarType(SlangScalarType type)
{
    switch (type)
    {
        case SLANG_SCALAR_TYPE_INT32:       return BaseType::Int;
        case SLANG_SCALAR_TYPE_UINT32:      return BaseType::UInt;
        case SLANG_SCALAR_TYPE_INT16:       return BaseType::Int16;
        case SLANG_SCALAR_TYPE_UINT16:      return BaseType::UInt16;
        case SLANG_SCALAR_TYPE_INT64:       return BaseType::Int64;
        case SLANG_SCALAR_TYPE_UINT64:      return BaseType::UInt64;
        case SLANG_SCALAR_TYPE_INT8:        return BaseType::Int8;
        case SLANG_SCALAR_TYPE_UINT8:       return BaseType::UInt8;
        case SLANG_SCALAR_TYPE_FLOAT16:     return BaseType::Half;
        case SLANG_SCALAR_TYPE_FLOAT32:     return BaseType::Float;
        case SLANG_SCALAR_TYPE_FLOAT64:     return BaseType::Double;
        case SLANG_SCALAR_TYPE_BOOL:        return BaseType::Bool;
        default:                            return BaseType::Void;
    }
}

// TODO(JS): There is an inherent problem here:
// 
// TimF: The big gotcha you'd have with trying to look up the IRVar or whatever from an intrinsic is that it is very easy for the user to "smuggle" a resource-type value through an intermediate function:
//
// ```
// Imagine this is user code...
// void f(RWTexture2D t) { t.YourOpThatYouAdded(...); }[attributeYouCareAbout(...)]
// RWTexture2D gTex;
// ...
// f(gTex);
//
// ```
// 
// So when emitting IR code for f, there is no way to trace t back to gTex and get at[attributeYouCareAbout(...)]
// Structurally, you can get back to the IRParam for t and that's it.
// And even if there was some magic way to trace back through the call site, you would run into the problem that some call sites
// might call f(gTex) and other might call f(gSomeOtherTex) and there is no guarantee the attributes on those two textures would match.
//
// The VK back-end gets away with this kind of coincidentally, since the "legalization" we have to do for resources means that there wouldn't be a single f() function any more.
// But for CUDA and C++ that's not the case or generally desirable.

static IRFormatDecoration* _findImageFormatDecoration(IRInst* resourceInst)
{
    // JS(TODO):
    // There could perhaps be other situations, that need to be covered

    // If this is a load, we need to get the decoration from the field key
    if (IRLoad* load = as<IRLoad>(resourceInst))
    {
        if (IRFieldAddress* fieldAddress = as<IRFieldAddress>(load->getOperand(0)))
        {
            IRInst* field = fieldAddress->getField();
            return field->findDecoration<IRFormatDecoration>();
        }
    }
    // Otherwise just try on the instruction
    return resourceInst->findDecoration<IRFormatDecoration>();
}

// Returns true if dataType and imageFormat are compatible - that they have the same representation,
// and no conversion is required.
static bool _isImageFormatCompatible(ImageFormat imageFormat, IRType* dataType)
{
    int numElems = 1;

    if (auto vecType = as<IRVectorType>(dataType))
    {
        numElems = int(getIntVal(vecType->getElementCount()));
        dataType = vecType->getElementType();
    }

    BaseType baseType = BaseType::Void;
    if (auto basicType = as<IRBasicType>(dataType))
    {
        baseType = basicType->getBaseType();
    }

    const auto& imageFormatInfo = getImageFormatInfo(imageFormat);
    const BaseType formatBaseType = _getBaseTypeFromScalarType(imageFormatInfo.scalarType);

    if (numElems != imageFormatInfo.channelCount)
    {
        SLANG_ASSERT(!"Format doesn't match channel count");
        return false;
    }

    return formatBaseType == baseType;
}

static bool _isConvertRequired(ImageFormat imageFormat, IRInst* callee)
{
    auto textureType = as<IRTextureTypeBase>(callee->getDataType());
    IRType* elementType = textureType ? textureType->getElementType() : nullptr;
    return elementType && !_isImageFormatCompatible(imageFormat, elementType);
}

static size_t _calcBackingElementSizeInBytes(IRInst* resourceInst)
{
    // First see if there is a format associated with the resource
    if (IRFormatDecoration* formatDecoration = _findImageFormatDecoration(resourceInst))
    {
        return getImageFormatInfo(formatDecoration->getFormat()).sizeInBytes;
    }
    else
    {
        // If not we *assume* the backing format is the same as the element type used for access.
        /// Ie in RWTexture<T>, this would return sizeof(T)

        auto textureType = as<IRTextureTypeBase>(resourceInst->getDataType());
        IRType* elementType = textureType ? textureType->getElementType() : nullptr;

        if (elementType)
        {
            int numElems = 1;

            if (auto vecType = as<IRVectorType>(elementType))
            {
                numElems = int(getIntVal(vecType->getElementCount()));
                elementType = vecType->getElementType();
            }

            BaseType baseType = BaseType::Void;
            if (auto basicType = as<IRBasicType>(elementType))
            {
                baseType = basicType->getBaseType();
            }

            const auto& info = BaseTypeInfo::getInfo(baseType);
            return info.sizeInBytes * numElems; 
        }
    }

    // When in doubt 4 is not a terrible guess based on limitations around DX11 etc
    return 4;
}

static bool _isResourceRead(IRCall* call)
{
    IRType* returnType = call->getDataType();
    return returnType && (as<IRVoidType>(returnType) == nullptr);
}

static bool _isResourceWrite(IRCall* call)
{
    IRType* returnType = call->getDataType();
    return returnType && (as<IRVoidType>(returnType) != nullptr);
}

const char* IntrinsicExpandContext::_emitSpecial(const char* cursor)
{
    const char*const end = m_text.end();
    
    // Check we are at start of 'special' sequence
    SLANG_ASSERT(*cursor == '$');
    cursor++;

    SLANG_RELEASE_ASSERT(cursor < end);

    const char d = *cursor++;

    switch (d)
    {
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
        {
            // Simple case: emit one of the direct arguments to the call
            Index argIndex = d - '0' + m_argIndexOffset;
            SLANG_RELEASE_ASSERT((0 <= argIndex) && (argIndex < m_argCount));
            m_writer->emit("(");
            m_emitter->emitOperand(m_args[argIndex].get(), getInfo(EmitOp::General));
            m_writer->emit(")");
        }
        break;

        case 'G':
        {
            // Get the type/value at the index of the specialization of this generic

            SLANG_RELEASE_ASSERT(*cursor >= '0' && *cursor <= '9');
            Index argIndex = (*cursor++) - '0' + m_argIndexOffset;
            
            IRSpecialize* specialize = as<IRSpecialize>(m_callInst->getCallee());
            SLANG_ASSERT(specialize);

            {
                auto argCount = Index(specialize->getArgCount());
                SLANG_UNUSED(argCount);
                SLANG_ASSERT(argIndex < argCount);

                auto arg = specialize->getArg(argIndex);

                if (auto type = as<IRType>(arg))
                {
                    m_emitter->emitType(type);
                }
                else
                {
                    m_emitter->emitVal(arg, getInfo(EmitOp::General));
                }
            }
        }
        break;

        case 'T':
            // Get the the 'element' type for the type of the param at the index
        {
            SLANG_RELEASE_ASSERT(*cursor >= '0' && *cursor <= '9');
            Index argIndex = (*cursor++) - '0' + m_argIndexOffset;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);

            IRType* type = m_args[argIndex].get()->getDataType();
            if (auto baseTextureType = as<IRTextureType>(type))
            {
                type = baseTextureType->getElementType();
            }
            m_emitter->emitType(type);
        }
        break;

        case 'S':
            // Get the scalar type of a generic at specified index
        {
            SLANG_RELEASE_ASSERT(*cursor >= '0' && *cursor <= '9');
            Index argIndex = (*cursor++) - '0' + m_argIndexOffset;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);

            IRType* type = m_args[argIndex].get()->getDataType();
            if (auto baseTextureType = as<IRTextureType>(type))
            {
                type = baseTextureType->getElementType();
            }

            IRBasicType* underlyingType = nullptr;
            if (auto basicType = as<IRBasicType>(type))
            {
                underlyingType = basicType;
            }
            else if (auto vectorType = as<IRVectorType>(type))
            {
                underlyingType = as<IRBasicType>(vectorType->getElementType());
            }
            else if (auto matrixType = as<IRMatrixType>(type))
            {
                underlyingType = as<IRBasicType>(matrixType->getElementType());
            }

            SLANG_ASSERT(underlyingType);

            m_emitter->emitSimpleType(underlyingType);
        }
        break;
        case 'p':
        {
            // If we are calling a D3D texturing operation in the form t.Foo(s, ...),
            // then this form will pair up the t and s arguments as needed for a GLSL
            // texturing operation.
            SLANG_RELEASE_ASSERT(m_argCount >= 1);

            auto textureArg = m_args[0].get();

            if (auto baseTextureSamplerType = as<IRTextureSamplerType>(textureArg->getDataType()))
            {
                // If the base object (first argument) has a combined texture-sampler type,
                // then we can simply use that argument as-is.
                //
                m_emitter->emitOperand(textureArg, getInfo(EmitOp::General));

                // HACK: Because the target intrinsic strings are using indices based on the
                // parameter list with the `SamplerState` parameter in place, seeing this opcode
                // and this type tells us that we are about to have an off-by-one sort of
                // situation. We quietly patch it up by offseting the index-based access for
                // all the other operands.
                //
                m_argIndexOffset -= 1;
            }
            else if (auto baseTextureType = as<IRTextureType>(textureArg->getDataType()))
            {
                // If the base object (first argument) has a texture type, then we expect
                // the next argument to be a sampler to pair with it.
                //
                SLANG_RELEASE_ASSERT(m_argCount >= 2);
                auto samplerArg = m_args[1].get();

                // We will emit GLSL code to construct the corresponding combined texture/sampler
                // type from the separate pieces.
                //
                m_emitter->emitTextureOrTextureSamplerType(baseTextureType, "sampler");
                if (auto samplerType = as<IRSamplerStateTypeBase>(samplerArg->getDataType()))
                {
                    if (as<IRSamplerComparisonStateType>(samplerType))
                    {
                        m_writer->emit("Shadow");
                    }
                }

                m_writer->emit("(");
                m_emitter->emitOperand(textureArg, getInfo(EmitOp::General));
                m_writer->emit(",");
                m_emitter->emitOperand(samplerArg, getInfo(EmitOp::General));
                m_writer->emit(")");
            }
            else
            {
                SLANG_UNEXPECTED("bad format in intrinsic definition");
            }
        }
        break;

        case 'C':
        {
            // The $C intrinsic is a mechanism to change the name of an invocation depending on if there is a format
            // conversion required between the type associated by the resource and the backing ImageFormat.
            // Currently this is only implemented on CUDA, where there are specialized versions of the RWTexture
            // writes that will do a format conversion.
            if (m_emitter->getTarget() == CodeGenTarget::CUDASource)
            {
                IRInst* resourceInst = m_callInst->getArg(0);

                if (IRFormatDecoration* formatDecoration = _findImageFormatDecoration(resourceInst))
                {
                    const ImageFormat imageFormat = formatDecoration->getFormat();
                    if (_isConvertRequired(imageFormat, resourceInst))
                    {
                        // If the function returns something it's a reader so we may need to convert
                        // and in doing so require half
                        if (_isResourceRead(m_callInst))
                        {
                            // If the source format if half derived, then we need to enable half
                            switch (imageFormat)
                            {
                                case ImageFormat::r16f:
                                case ImageFormat::rg16f:
                                case ImageFormat::rgba16f:
                                {
                                    CUDAExtensionTracker* extensionTracker = as<CUDAExtensionTracker>(m_emitter->getExtensionTracker());
                                    if (extensionTracker)
                                    {
                                        extensionTracker->requireBaseType(BaseType::Half);
                                    }
                                    break;
                                }
                                default: break;
                            }
                        }

                        // Append _convert on the name to signify we need to use a code path, that will automatically
                        // do the format conversion.
                        m_writer->emit("_convert");
                    }                    
                }
            }
            break;
        }

        case 'E':
        {
            /// Sometimes accesses need to be scaled. For example in CUDA the x coordinate for surface
            /// access is byte addressed.
            /// $E will return the byte size of the *backing element*.

            IRInst* resourceInst = m_callInst->getArg(0);
            size_t elemSizeInBytes = _calcBackingElementSizeInBytes(resourceInst);

            // If we have a format converstion and its a *write* we don't need to scale
            if (IRFormatDecoration* formatDecoration = _findImageFormatDecoration(resourceInst))
            {
                const ImageFormat imageFormat = formatDecoration->getFormat();
                if (_isConvertRequired(imageFormat, resourceInst) && _isResourceWrite(m_callInst))
                {
                    // If there is a conversion *and* it's a write we don't need to scale.
                    elemSizeInBytes = 1;
                }
            }

            SLANG_ASSERT(elemSizeInBytes > 0);
            m_writer->emitUInt64(UInt64(elemSizeInBytes));
            break;
        }

        case 'c':
        {
            // When doing texture access in glsl the result may need to be cast.
            // In particular if the underlying texture is 'half' based, glsl only accesses (read/write)
            // as float. So we need to cast to a half type on output.
            // When storing into a texture it is still the case the value written must be half - but
            // we don't need to do any casting there as half is coerced to float without a problem.
            SLANG_RELEASE_ASSERT(m_argCount >= 1);

            auto textureArg = m_args[0].get();
            if (auto baseTextureType = as<IRTextureType>(textureArg->getDataType()))
            {
                auto elementType = baseTextureType->getElementType();
                IRBasicType* underlyingType = nullptr;
                if (auto basicType = as<IRBasicType>(elementType))
                {
                    underlyingType = basicType;
                }
                else if (auto vectorType = as<IRVectorType>(elementType))
                {
                    underlyingType = as<IRBasicType>(vectorType->getElementType());
                }

                // We only need to output a cast if the underlying type is half.
                if (underlyingType && underlyingType->getOp() == kIROp_HalfType)
                {
                    m_emitter->emitSimpleType(elementType);
                    m_writer->emit("(");
                    m_openParenCount++;
                }
            }
        }
        break;

        case 'z':
        {
            // If we are calling a D3D texturing operation in the form t.Foo(s, ...),
            // where `t` is a `Texture*<T>`, then this is the step where we try to
            // properly swizzle the output of the equivalent GLSL call into the right
            // shape.
            SLANG_RELEASE_ASSERT(m_argCount >= 1);

            auto textureArg = m_args[0].get();
            IRType* elementType  = nullptr;

            if (auto baseTextureType = as<IRTextureType>(textureArg->getDataType()))
            {
                elementType = baseTextureType->getElementType();
            }
            else if(auto baseTextureSamplerType = as<IRTextureSamplerType>(textureArg->getDataType()))
            {
                elementType = baseTextureSamplerType->getElementType();
            }
            else
            {
                SLANG_UNEXPECTED("bad format in intrinsic definition");
            }

            SLANG_ASSERT(elementType);
            if (auto basicType = as<IRBasicType>(elementType))
            {
                // A scalar result is expected
                m_writer->emit(".x");
            }
            else if (auto vectorType = as<IRVectorType>(elementType))
            {
                // A vector result is expected
                auto elementCount = getIntVal(vectorType->getElementCount());

                if (elementCount < 4)
                {
                    char const* swiz[] = { "", ".x", ".xy", ".xyz", "" };
                    m_writer->emit(swiz[elementCount]);
                }
            }
            else
            {
                // What other cases are possible?
                SLANG_UNEXPECTED("bad format in intrinsic definition");
            }
        }
        break;

        case 'N':
        {
            // Extract the element count from a vector argument so that
            // we can use it in the constructed expression.

            SLANG_RELEASE_ASSERT(*cursor >= '0' && *cursor <= '9');
            Index argIndex = (*cursor++) - '0' + m_argIndexOffset;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);

            auto vectorArg = m_args[argIndex].get();
            if (auto vectorType = as<IRVectorType>(vectorArg->getDataType()))
            {
                auto elementCount = getIntVal(vectorType->getElementCount());
                m_writer->emit(elementCount);
            }
            else
            {
                SLANG_UNEXPECTED("bad format in intrinsic definition");
            }
        }
        break;

        case 'V':
        {
            // Take an argument of some scalar/vector type and pad
            // it out to a 4-vector with the same element type
            // (this is the inverse of `$z`).
            //
            SLANG_RELEASE_ASSERT(*cursor >= '0' && *cursor <= '9');
            Index argIndex = (*cursor++) - '0' + m_argIndexOffset;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);

            auto arg = m_args[argIndex].get();
            IRIntegerValue elementCount = 1;
            IRType* elementType = arg->getDataType();
            if (auto vectorType = as<IRVectorType>(elementType))
            {
                elementCount = getIntVal(vectorType->getElementCount());
                elementType = vectorType->getElementType();
            }

            if (elementCount == 4)
            {
                // In the simple case, the operand is already a 4-vector,
                // so we can just emit it as-is.
                m_emitter->emitOperand(arg, getInfo(EmitOp::General));
            }
            else
            {
                // Otherwise, we need to construct a 4-vector from the
                // value we have, padding it out with zero elements as
                // needed.
                //
                m_emitter->emitVectorTypeName(elementType, 4);
                m_writer->emit("(");
                m_emitter->emitOperand(arg, getInfo(EmitOp::General));
                for (IRIntegerValue ii = elementCount; ii < 4; ++ii)
                {
                    m_writer->emit(", ");
                    if (m_emitter->getSourceLanguage() == SourceLanguage::GLSL)
                    {
                        m_emitter->emitSimpleType(elementType);
                        m_writer->emit("(0)");
                    }
                    else
                    {
                        m_writer->emit("0");
                    }
                }
                m_writer->emit(")");
            }
        }
        break;

        case 'a':
        {
            // We have an operation that needs to lower to either
            // `atomic*` or `imageAtomic*` for GLSL, depending on
            // whether its first operand is a subscript into an
            // array. This `$a` is the first `a` in `atomic`,
            // so we will replace it accordingly.
            //
            // TODO: This distinction should be made earlier,
            // with the front-end picking the right overload
            // based on the "address space" of the argument.

            Index argIndex = 0;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);

            auto arg = m_args[argIndex].get();
            if (arg->getOp() == kIROp_ImageSubscript)
            {
                m_writer->emit("imageA");
            }
            else
            {
                m_writer->emit("a");
            }
        }
        break;

        case 'A':
        {
            // We have an operand that represents the destination
            // of an atomic operation in GLSL, and it should
            // be lowered based on whether it is an ordinary l-value,
            // or an image subscript. In the image subscript case
            // this operand will turn into multiple arguments
            // to the `imageAtomic*` function.
            //

            Index argIndex = 0;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);

            auto arg = m_args[argIndex].get();
            if (arg->getOp() == kIROp_ImageSubscript)
            {
                if (m_emitter->getSourceLanguage() == SourceLanguage::GLSL)
                {
                    // TODO: we don't handle the multisample
                    // case correctly here, where the last
                    // component of the image coordinate needs
                    // to be broken out into its own argument.
                    //
                    m_writer->emit("(");
                    m_emitter->emitOperand(arg->getOperand(0), getInfo(EmitOp::General));
                    m_writer->emit("), ");

                    // The coordinate argument will have been computed
                    // as a `vector<uint, N>` because that is how the
                    // HLSL image subscript operations are defined.
                    // In contrast, the GLSL `imageAtomic*` operations
                    // expect `vector<int, N>` coordinates, so we
                    // will hackily insert the conversion here as
                    // part of the intrinsic op.
                    //
                    auto coords = arg->getOperand(1);
                    auto coordsType = coords->getDataType();

                    auto coordsVecType = as<IRVectorType>(coordsType);
                    IRIntegerValue elementCount = 1;
                    if (coordsVecType)
                    {
                        coordsType = coordsVecType->getElementType();
                        elementCount = getIntVal(coordsVecType->getElementCount());
                    }

                    SLANG_ASSERT(coordsType->getOp() == kIROp_UIntType);

                    if (elementCount > 1)
                    {
                        m_writer->emit("ivec");
                        m_writer->emit(elementCount);
                    }
                    else
                    {
                        m_writer->emit("int");
                    }

                    m_writer->emit("(");
                    m_emitter->emitOperand(arg->getOperand(1), getInfo(EmitOp::General));
                    m_writer->emit(")");
                }
                else
                {
                    m_writer->emit("(");
                    m_emitter->emitOperand(arg, getInfo(EmitOp::General));
                    m_writer->emit(")");
                }
            }
            else
            {
                m_writer->emit("(");
                m_emitter->emitOperand(arg, getInfo(EmitOp::General));
                m_writer->emit(")");
            }
        }
        break;

        // We will use the `$X` case as a prefix for
        // special logic needed when cross-compiling ray-tracing
        // shaders.
        case 'X':
        {
            SLANG_RELEASE_ASSERT(*cursor);
            switch (*cursor++)
            {
                case 'P':
                {
                    // The `$XP` case handles looking up
                    // the associated `location` for a variable
                    // used as the argument ray payload at a
                    // trace call site.

                    Index argIndex = 0;
                    SLANG_RELEASE_ASSERT(m_argCount > argIndex);
                    auto arg = m_args[argIndex].get();
                    auto argLoad = as<IRLoad>(arg);
                    SLANG_RELEASE_ASSERT(argLoad);
                    auto argVar = argLoad->getOperand(0);
                    m_writer->emit(m_emitter->getRayPayloadLocation(argVar));
                }
                break;

                case 'C':
                {
                    // The `$XC` case handles looking up
                    // the associated `location` for a variable
                    // used as the argument callable payload at a
                    // call site.

                    Index argIndex = 0;
                    SLANG_RELEASE_ASSERT(m_argCount > argIndex);
                    auto arg = m_args[argIndex].get();
                    auto argLoad = as<IRLoad>(arg);
                    SLANG_RELEASE_ASSERT(argLoad);
                    auto argVar = argLoad->getOperand(0);
                    m_writer->emit(m_emitter->getCallablePayloadLocation(argVar));
                }
                break;

                default:
                    SLANG_RELEASE_ASSERT(false);
                    break;
            }
        }
        break;

        case 'P':
            // Type-based prefix as used for CUDA and C++ targets
        {
            Index argIndex = 0;
            SLANG_RELEASE_ASSERT(m_argCount > argIndex);
            auto arg = m_args[argIndex].get();
            auto argType = arg->getDataType();

            const char* str = "";
            switch (argType->getOp())
            {
#define CASE(OP, STR) \
                    case kIROp_##OP: str = #STR; break

                CASE(Int8Type, I8);
                CASE(Int16Type, I16);
                CASE(IntType, I32);
                CASE(Int64Type, I64);
                CASE(UInt8Type, U8);
                CASE(UInt16Type, U16);
                CASE(UIntType, U32);
                CASE(UInt64Type, U64);
                CASE(HalfType, F16);
                CASE(FloatType, F32);
                CASE(DoubleType, F64);

#undef CASE

                default:
                    SLANG_UNEXPECTED("unexpected type in intrinsic definition");
                    break;
            }
            m_writer->emit(str);
        }
        break;

        default:
            SLANG_UNEXPECTED("bad format in intrinsic definition");
            break;
    }

    // Return the cursor position. Will be next character after characters processed
    // for the 'special'
    return cursor;
}

} // namespace Slang