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authorJames Lemke <jim@wasabisystems.com>2003-12-16 22:38:58 +0000
committerJim Wilson <wilson@gcc.gnu.org>2003-12-16 14:38:58 -0800
commit6d43c524dd8eb5db820457d828749406c66d1f0a (patch)
tree1a2a553faf55d16bdd3d4e470832137ff3a4a0d6 /libjava/java/sql/PreparedStatement.java
parent9e129d901c529cf5fa99f0ae678932cad0df2ce1 (diff)
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xscale testcases from James Lemke
xscale testcases from James Lemke * gcc.dg/arm-scd42-[123].c: New tests. From-SVN: r74712
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generated by cgit v1.1 at 2025-10-10 11:01:13 +0000
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/**
 * Defines the bulk of the classes which represent the AST at the expression level.
 *
 * Specification: ($LINK2 https://dlang.org/spec/expression.html, Expressions)
 *
 * Copyright:   Copyright (C) 1999-2023 by The D Language Foundation, All Rights Reserved
 * Authors:     $(LINK2 https://www.digitalmars.com, Walter Bright)
 * License:     $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
 * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/expression.d, _expression.d)
 * Documentation:  https://dlang.org/phobos/dmd_expression.html
 * Coverage:    https://codecov.io/gh/dlang/dmd/src/master/src/dmd/expression.d
 */

module dmd.expression;

import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.string;

import dmd.aggregate;
import dmd.aliasthis;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.astenums;
import dmd.ast_node;
import dmd.gluelayer;
import dmd.constfold;
import dmd.ctfeexpr;
import dmd.ctorflow;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.delegatize;
import dmd.dimport;
import dmd.dinterpret;
import dmd.dmodule;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.errorsink;
import dmd.escape;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.inline;
import dmd.location;
import dmd.mtype;
import dmd.nspace;
import dmd.objc;
import dmd.opover;
import dmd.optimize;
import dmd.postordervisitor;
import dmd.root.complex;
import dmd.root.ctfloat;
import dmd.root.filename;
import dmd.common.outbuffer;
import dmd.root.optional;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.root.string;
import dmd.root.utf;
import dmd.safe;
import dmd.sideeffect;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;

enum LOGSEMANTIC = false;

void emplaceExp(T : Expression, Args...)(void* p, Args args)
{
    static if (__VERSION__ < 2099)
        const init = typeid(T).initializer;
    else
        const init = __traits(initSymbol, T);
    p[0 .. __traits(classInstanceSize, T)] = init[];
    (cast(T)p).__ctor(args);
}

void emplaceExp(T : UnionExp)(T* p, Expression e)
{
    memcpy(p, cast(void*)e, e.size);
}

/// Return value for `checkModifiable`
enum Modifiable
{
    /// Not modifiable
    no,
    /// Modifiable (the type is mutable)
    yes,
    /// Modifiable because it is initialization
    initialization,
}
/**
 * Specifies how the checkModify deals with certain situations
 */
enum ModifyFlags
{
    /// Issue error messages on invalid modifications of the variable
    none,
    /// No errors are emitted for invalid modifications
    noError = 0x1,
    /// The modification occurs for a subfield of the current variable
    fieldAssign = 0x2,
}

/****************************************
 * Find the first non-comma expression.
 * Params:
 *      e = Expressions connected by commas
 * Returns:
 *      left-most non-comma expression
 */
inout(Expression) firstComma(inout Expression e)
{
    Expression ex = cast()e;
    while (ex.op == EXP.comma)
        ex = (cast(CommaExp)ex).e1;
    return cast(inout)ex;

}

/****************************************
 * Find the last non-comma expression.
 * Params:
 *      e = Expressions connected by commas
 * Returns:
 *      right-most non-comma expression
 */

inout(Expression) lastComma(inout Expression e)
{
    Expression ex = cast()e;
    while (ex.op == EXP.comma)
        ex = (cast(CommaExp)ex).e2;
    return cast(inout)ex;

}

/*****************************************
 * Determine if `this` is available by walking up the enclosing
 * scopes until a function is found.
 *
 * Params:
 *      sc = where to start looking for the enclosing function
 * Returns:
 *      Found function if it satisfies `isThis()`, otherwise `null`
 */
FuncDeclaration hasThis(Scope* sc)
{
    //printf("hasThis()\n");
    Dsymbol p = sc.parent;
    while (p && p.isTemplateMixin())
        p = p.parent;
    FuncDeclaration fdthis = p ? p.isFuncDeclaration() : null;
    //printf("fdthis = %p, '%s'\n", fdthis, fdthis ? fdthis.toChars() : "");

    // Go upwards until we find the enclosing member function
    FuncDeclaration fd = fdthis;
    while (1)
    {
        if (!fd)
        {
            return null;
        }
        if (!fd.isNested() || fd.isThis() || (fd.hasDualContext() && fd.isMember2()))
            break;

        Dsymbol parent = fd.parent;
        while (1)
        {
            if (!parent)
                return null;
            TemplateInstance ti = parent.isTemplateInstance();
            if (ti)
                parent = ti.parent;
            else
                break;
        }
        fd = parent.isFuncDeclaration();
    }

    if (!fd.isThis() && !(fd.hasDualContext() && fd.isMember2()))
    {
        return null;
    }

    assert(fd.vthis);
    return fd;

}

/***********************************
 * Determine if a `this` is needed to access `d`.
 * Params:
 *      sc = context
 *      d = declaration to check
 * Returns:
 *      true means a `this` is needed
 */
bool isNeedThisScope(Scope* sc, Declaration d)
{
    if (sc.intypeof == 1)
        return false;

    AggregateDeclaration ad = d.isThis();
    if (!ad)
        return false;
    //printf("d = %s, ad = %s\n", d.toChars(), ad.toChars());

    for (Dsymbol s = sc.parent; s; s = s.toParentLocal())
    {
        //printf("\ts = %s %s, toParent2() = %p\n", s.kind(), s.toChars(), s.toParent2());
        if (AggregateDeclaration ad2 = s.isAggregateDeclaration())
        {
            if (ad2 == ad)
                return false;
            else if (ad2.isNested())
                continue;
            else
                return true;
        }
        if (FuncDeclaration f = s.isFuncDeclaration())
        {
            if (f.isMemberLocal())
                break;
        }
    }
    return true;
}

/****************************************
 * Expand tuples in-place.
 *
 * Example:
 *     When there's a call `f(10, pair: AliasSeq!(20, 30), single: 40)`, the input is:
 *         `exps =  [10, (20, 30), 40]`
 *         `names = [null, "pair", "single"]`
 *     The arrays will be modified to:
 *         `exps =  [10, 20, 30, 40]`
 *         `names = [null, "pair", null, "single"]`
 *
 * Params:
 *     exps  = array of Expressions
 *     names = optional array of names corresponding to Expressions
 */
extern (C++) void expandTuples(Expressions* exps, Identifiers* names = null)
{
    //printf("expandTuples()\n");
    if (exps is null)
        return;

    if (names)
    {
        if (exps.length != names.length)
        {
            printf("exps.length = %d, names.length = %d\n", cast(int) exps.length, cast(int) names.length);
            printf("exps = %s, names = %s\n", exps.toChars(), names.toChars());
            if (exps.length > 0)
                printf("%s\n", (*exps)[0].loc.toChars());
            assert(0);
        }
    }

    // At `index`, a tuple of length `length` is expanded. Insert corresponding nulls in `names`.
    void expandNames(size_t index, size_t length)
    {
        if (names)
        {
            if (length == 0)
            {
                names.remove(index);
                return;
            }
            foreach (i; 1 .. length)
            {
                names.insert(index + i, cast(Identifier) null);
            }
        }
    }

    for (size_t i = 0; i < exps.length; i++)
    {
        Expression arg = (*exps)[i];
        if (!arg)
            continue;

        // Look for tuple with 0 members
        if (auto e = arg.isTypeExp())
        {
            if (auto tt = e.type.toBasetype().isTypeTuple())
            {
                if (!tt.arguments || tt.arguments.length == 0)
                {
                    exps.remove(i);
                    expandNames(i, 0);
                    if (i == exps.length)
                        return;
                }
                else // Expand a TypeTuple
                {
                    exps.remove(i);
                    auto texps = new Expressions(tt.arguments.length);
                    foreach (j, a; *tt.arguments)
                        (*texps)[j] = new TypeExp(e.loc, a.type);
                    exps.insert(i, texps);
                    expandNames(i, texps.length);
                }
                i--;
                continue;
            }
        }

        // Inline expand all the tuples
        while (arg.op == EXP.tuple)
        {
            TupleExp te = cast(TupleExp)arg;
            exps.remove(i); // remove arg
            exps.insert(i, te.exps); // replace with tuple contents
            expandNames(i, te.exps.length);
            if (i == exps.length)
                return; // empty tuple, no more arguments
            (*exps)[i] = Expression.combine(te.e0, (*exps)[i]);
            arg = (*exps)[i];
        }
    }
}

/****************************************
 * Expand alias this tuples.
 */
TupleDeclaration isAliasThisTuple(Expression e)
{
    if (!e.type)
        return null;

    Type t = e.type.toBasetype();
    while (true)
    {
        if (Dsymbol s = t.toDsymbol(null))
        {
            if (auto ad = s.isAggregateDeclaration())
            {
                s = ad.aliasthis ? ad.aliasthis.sym : null;
                if (s && s.isVarDeclaration())
                {
                    TupleDeclaration td = s.isVarDeclaration().toAlias().isTupleDeclaration();
                    if (td && td.isexp)
                        return td;
                }
                if (Type att = t.aliasthisOf())
                {
                    t = att;
                    continue;
                }
            }
        }
        return null;
    }
}

/****************************************
 * If `s` is a function template, i.e. the only member of a template
 * and that member is a function, return that template.
 * Params:
 *      s = symbol that might be a function template
 * Returns:
 *      template for that function, otherwise null
 */
TemplateDeclaration getFuncTemplateDecl(Dsymbol s) @safe
{
    FuncDeclaration f = s.isFuncDeclaration();
    if (f && f.parent)
    {
        if (auto ti = f.parent.isTemplateInstance())
        {
            if (!ti.isTemplateMixin() && ti.tempdecl)
            {
                auto td = ti.tempdecl.isTemplateDeclaration();
                if (td.onemember && td.ident == f.ident)
                {
                    return td;
                }
            }
        }
    }
    return null;
}

/************************************************
 * If we want the value of this expression, but do not want to call
 * the destructor on it.
 */
Expression valueNoDtor(Expression e)
{
    auto ex = lastComma(e);

    if (auto ce = ex.isCallExp())
    {
        /* The struct value returned from the function is transferred
         * so do not call the destructor on it.
         * Recognize:
         *       ((S _ctmp = S.init), _ctmp).this(...)
         * and make sure the destructor is not called on _ctmp
         * BUG: if ex is a CommaExp, we should go down the right side.
         */
        if (auto dve = ce.e1.isDotVarExp())
        {
            if (dve.var.isCtorDeclaration())
            {
                // It's a constructor call
                if (auto comma = dve.e1.isCommaExp())
                {
                    if (auto ve = comma.e2.isVarExp())
                    {
                        VarDeclaration ctmp = ve.var.isVarDeclaration();
                        if (ctmp)
                        {
                            ctmp.storage_class |= STC.nodtor;
                            assert(!ce.isLvalue());
                        }
                    }
                }
            }
        }
    }
    else if (auto ve = ex.isVarExp())
    {
        auto vtmp = ve.var.isVarDeclaration();
        if (vtmp && (vtmp.storage_class & STC.rvalue))
        {
            vtmp.storage_class |= STC.nodtor;
        }
    }
    return e;
}

/*********************************************
 * If e is an instance of a struct, and that struct has a copy constructor,
 * rewrite e as:
 *    (tmp = e),tmp
 * Input:
 *      sc = just used to specify the scope of created temporary variable
 *      destinationType = the type of the object on which the copy constructor is called;
 *                        may be null if the struct defines a postblit
 */
private Expression callCpCtor(Scope* sc, Expression e, Type destinationType)
{
    if (auto ts = e.type.baseElemOf().isTypeStruct())
    {
        StructDeclaration sd = ts.sym;
        if (sd.postblit || sd.hasCopyCtor)
        {
            /* Create a variable tmp, and replace the argument e with:
             *      (tmp = e),tmp
             * and let AssignExp() handle the construction.
             * This is not the most efficient, ideally tmp would be constructed
             * directly onto the stack.
             */
            auto tmp = copyToTemp(STC.rvalue, "__copytmp", e);
            if (sd.hasCopyCtor && destinationType)
            {
                // https://issues.dlang.org/show_bug.cgi?id=22619
                // If the destination type is inout we can preserve it
                // only if inside an inout function; if we are not inside
                // an inout function, then we will preserve the type of
                // the source
                if (destinationType.hasWild && !(sc.func.storage_class & STC.wild))
                    tmp.type = e.type;
                else
                    tmp.type = destinationType;
            }
            tmp.storage_class |= STC.nodtor;
            tmp.dsymbolSemantic(sc);
            Expression de = new DeclarationExp(e.loc, tmp);
            Expression ve = new VarExp(e.loc, tmp);
            de.type = Type.tvoid;
            ve.type = e.type;
            return Expression.combine(de, ve);
        }
    }
    return e;
}

/************************************************
 * Handle the postblit call on lvalue, or the move of rvalue.
 *
 * Params:
 *   sc = the scope where the expression is encountered
 *   e = the expression the needs to be moved or copied (source)
 *   t = if the struct defines a copy constructor, the type of the destination
 *
 * Returns:
 *  The expression that copy constructs or moves the value.
 */
extern (D) Expression doCopyOrMove(Scope *sc, Expression e, Type t = null)
{
    if (auto ce = e.isCondExp())
    {
        ce.e1 = doCopyOrMove(sc, ce.e1);
        ce.e2 = doCopyOrMove(sc, ce.e2);
    }
    else
    {
        e = e.isLvalue() ? callCpCtor(sc, e, t) : valueNoDtor(e);
    }
    return e;
}

/****************************************************************/
/* A type meant as a union of all the Expression types,
 * to serve essentially as a Variant that will sit on the stack
 * during CTFE to reduce memory consumption.
 */
extern (C++) struct UnionExp
{
    // yes, default constructor does nothing
    extern (D) this(Expression e)
    {
        memcpy(&this, cast(void*)e, e.size);
    }

    /* Extract pointer to Expression
     */
    extern (C++) Expression exp() return
    {
        return cast(Expression)&u;
    }

    /* Convert to an allocated Expression
     */
    extern (C++) Expression copy()
    {
        Expression e = exp();
        //if (e.size > sizeof(u)) printf("%s\n", EXPtoString(e.op).ptr);
        assert(e.size <= u.sizeof);
        switch (e.op)
        {
            case EXP.cantExpression:    return CTFEExp.cantexp;
            case EXP.voidExpression:    return CTFEExp.voidexp;
            case EXP.break_:            return CTFEExp.breakexp;
            case EXP.continue_:         return CTFEExp.continueexp;
            case EXP.goto_:             return CTFEExp.gotoexp;
            default:                    return e.copy();
        }
    }

private:
    // Ensure that the union is suitably aligned.
    align(8) union _AnonStruct_u
    {
        char[__traits(classInstanceSize, Expression)] exp;
        char[__traits(classInstanceSize, IntegerExp)] integerexp;
        char[__traits(classInstanceSize, ErrorExp)] errorexp;
        char[__traits(classInstanceSize, RealExp)] realexp;
        char[__traits(classInstanceSize, ComplexExp)] complexexp;
        char[__traits(classInstanceSize, SymOffExp)] symoffexp;
        char[__traits(classInstanceSize, StringExp)] stringexp;
        char[__traits(classInstanceSize, ArrayLiteralExp)] arrayliteralexp;
        char[__traits(classInstanceSize, AssocArrayLiteralExp)] assocarrayliteralexp;
        char[__traits(classInstanceSize, StructLiteralExp)] structliteralexp;
        char[__traits(classInstanceSize, CompoundLiteralExp)] compoundliteralexp;
        char[__traits(classInstanceSize, NullExp)] nullexp;
        char[__traits(classInstanceSize, DotVarExp)] dotvarexp;
        char[__traits(classInstanceSize, AddrExp)] addrexp;
        char[__traits(classInstanceSize, IndexExp)] indexexp;
        char[__traits(classInstanceSize, SliceExp)] sliceexp;
        char[__traits(classInstanceSize, VectorExp)] vectorexp;
    }

    _AnonStruct_u u;
}

/************************ TypeDotIdExp ************************************/
/* Things like:
 *      int.size
 *      foo.size
 *      (foo).size
 *      cast(foo).size
 */
DotIdExp typeDotIdExp(const ref Loc loc, Type type, Identifier ident) @safe
{
    return new DotIdExp(loc, new TypeExp(loc, type), ident);
}

/***************************************************
 * Given an Expression, find the variable it really is.
 *
 * For example, `a[index]` is really `a`, and `s.f` is really `s`.
 * Params:
 *      e = Expression to look at
 * Returns:
 *      variable if there is one, null if not
 */
VarDeclaration expToVariable(Expression e)
{
    while (1)
    {
        switch (e.op)
        {
            case EXP.variable:
                return (cast(VarExp)e).var.isVarDeclaration();

            case EXP.dotVariable:
                e = (cast(DotVarExp)e).e1;
                continue;

            case EXP.index:
            {
                IndexExp ei = cast(IndexExp)e;
                e = ei.e1;
                Type ti = e.type.toBasetype();
                if (ti.ty == Tsarray)
                    continue;
                return null;
            }

            case EXP.slice:
            {
                SliceExp ei = cast(SliceExp)e;
                e = ei.e1;
                Type ti = e.type.toBasetype();
                if (ti.ty == Tsarray)
                    continue;
                return null;
            }

            case EXP.this_:
            case EXP.super_:
                return (cast(ThisExp)e).var.isVarDeclaration();

            // Temporaries for rvalues that need destruction
            // are of form: (T s = rvalue, s). For these cases
            // we can just return var declaration of `s`. However,
            // this is intentionally not calling `Expression.extractLast`
            // because at this point we cannot infer the var declaration
            // of more complex generated comma expressions such as the
            // one for the array append hook.
            case EXP.comma:
            {
                if (auto ve = e.isCommaExp().e2.isVarExp())
                    return ve.var.isVarDeclaration();

                return null;
            }
            default:
                return null;
        }
    }
}

enum OwnedBy : ubyte
{
    code,          // normal code expression in AST
    ctfe,          // value expression for CTFE
    cache,         // constant value cached for CTFE
}

enum WANTvalue  = 0;    // default
enum WANTexpand = 1;    // expand const/immutable variables if possible

/***********************************************************
 * https://dlang.org/spec/expression.html#expression
 */
extern (C++) abstract class Expression : ASTNode
{
    Type type;      // !=null means that semantic() has been run
    Loc loc;        // file location
    const EXP op;   // to minimize use of dynamic_cast

    extern (D) this(const ref Loc loc, EXP op) scope @safe
    {
        //printf("Expression::Expression(op = %d) this = %p\n", op, this);
        this.loc = loc;
        this.op = op;
    }

    /// Returns: class instance size of this expression (implemented manually because `extern(C++)`)
    final size_t size() nothrow @nogc pure @safe const { return expSize[op]; }

    static void _init()
    {
        CTFEExp.cantexp = new CTFEExp(EXP.cantExpression);
        CTFEExp.voidexp = new CTFEExp(EXP.voidExpression);
        CTFEExp.breakexp = new CTFEExp(EXP.break_);
        CTFEExp.continueexp = new CTFEExp(EXP.continue_);
        CTFEExp.gotoexp = new CTFEExp(EXP.goto_);
        CTFEExp.showcontext = new CTFEExp(EXP.showCtfeContext);
    }

    /**
     * Deinitializes the global state of the compiler.
     *
     * This can be used to restore the state set by `_init` to its original
     * state.
     */
    static void deinitialize()
    {
        CTFEExp.cantexp = CTFEExp.cantexp.init;
        CTFEExp.voidexp = CTFEExp.voidexp.init;
        CTFEExp.breakexp = CTFEExp.breakexp.init;
        CTFEExp.continueexp = CTFEExp.continueexp.init;
        CTFEExp.gotoexp = CTFEExp.gotoexp.init;
        CTFEExp.showcontext = CTFEExp.showcontext.init;
    }

    /*********************************
     * Does *not* do a deep copy.
     */
    final Expression copy()
    {
        Expression e;
        if (!size)
        {
            debug
            {
                fprintf(stderr, "No expression copy for: %s\n", toChars());
                printf("op = %d\n", op);
            }
            assert(0);
        }

        // memory never freed, so can use the faster bump-pointer-allocation
        e = cast(Expression)allocmemory(size);
        //printf("Expression::copy(op = %d) e = %p\n", op, e);
        return cast(Expression)memcpy(cast(void*)e, cast(void*)this, size);
    }

    Expression syntaxCopy()
    {
        //printf("Expression::syntaxCopy()\n");
        //print();
        return copy();
    }

    // kludge for template.isExpression()
    override final DYNCAST dyncast() const
    {
        return DYNCAST.expression;
    }

    override const(char)* toChars() const
    {
        OutBuffer buf;
        HdrGenState hgs;
        toCBuffer(this, buf, hgs);
        return buf.extractChars();
    }

    /**********************************
     * Combine e1 and e2 by CommaExp if both are not NULL.
     */
    extern (D) static Expression combine(Expression e1, Expression e2) @safe
    {
        if (e1)
        {
            if (e2)
            {
                e1 = new CommaExp(e1.loc, e1, e2);
                e1.type = e2.type;
            }
        }
        else
            e1 = e2;
        return e1;
    }

    extern (D) static Expression combine(Expression e1, Expression e2, Expression e3) @safe
    {
        return combine(combine(e1, e2), e3);
    }

    extern (D) static Expression combine(Expression e1, Expression e2, Expression e3, Expression e4) @safe
    {
        return combine(combine(e1, e2), combine(e3, e4));
    }

    /**********************************
     * If 'e' is a tree of commas, returns the rightmost expression
     * by stripping off it from the tree. The remained part of the tree
     * is returned via e0.
     * Otherwise 'e' is directly returned and e0 is set to NULL.
     */
    extern (D) static Expression extractLast(Expression e, out Expression e0) @safe
    {
        if (e.op != EXP.comma)
        {
            return e;
        }

        CommaExp ce = cast(CommaExp)e;
        if (ce.e2.op != EXP.comma)
        {
            e0 = ce.e1;
            return ce.e2;
        }
        else
        {
            e0 = e;

            Expression* pce = &ce.e2;
            while ((cast(CommaExp)(*pce)).e2.op == EXP.comma)
            {
                pce = &(cast(CommaExp)(*pce)).e2;
            }
            assert((*pce).op == EXP.comma);
            ce = cast(CommaExp)(*pce);
            *pce = ce.e1;

            return ce.e2;
        }
    }

    extern (D) static Expressions* arraySyntaxCopy(Expressions* exps)
    {
        Expressions* a = null;
        if (exps)
        {
            a = new Expressions(exps.length);
            foreach (i, e; *exps)
            {
                (*a)[i] = e ? e.syntaxCopy() : null;
            }
        }
        return a;
    }

    dinteger_t toInteger()
    {
        //printf("Expression %s\n", EXPtoString(op).ptr);
        if (!type.isTypeError())
            error(loc, "integer constant expression expected instead of `%s`", toChars());
        return 0;
    }

    uinteger_t toUInteger()
    {
        //printf("Expression %s\n", EXPtoString(op).ptr);
        return cast(uinteger_t)toInteger();
    }

    real_t toReal()
    {
        error(loc, "floating point constant expression expected instead of `%s`", toChars());
        return CTFloat.zero;
    }

    real_t toImaginary()
    {
        error(loc, "floating point constant expression expected instead of `%s`", toChars());
        return CTFloat.zero;
    }

    complex_t toComplex()
    {
        error(loc, "floating point constant expression expected instead of `%s`", toChars());
        return complex_t(CTFloat.zero);
    }

    StringExp toStringExp()
    {
        return null;
    }

    /***************************************
     * Return !=0 if expression is an lvalue.
     */
    bool isLvalue()
    {
        return false;
    }

    /*******************************
     * Give error if we're not an lvalue.
     * If we can, convert expression to be an lvalue.
     */
    Expression toLvalue(Scope* sc, Expression e)
    {
        if (!e)
            e = this;
        else if (!loc.isValid())
            loc = e.loc;

        if (e.op == EXP.type)
            error(loc, "`%s` is a `%s` definition and cannot be modified", e.type.toChars(), e.type.kind());
        else
            error(loc, "`%s` is not an lvalue and cannot be modified", e.toChars());

        return ErrorExp.get();
    }

    Expression modifiableLvalue(Scope* sc, Expression e)
    {
        //printf("Expression::modifiableLvalue() %s, type = %s\n", toChars(), type.toChars());
        // See if this expression is a modifiable lvalue (i.e. not const)
        if (checkModifiable(this, sc) == Modifiable.yes)
        {
            assert(type);
            if (!type.isMutable())
            {
                if (auto dve = this.isDotVarExp())
                {
                    if (isNeedThisScope(sc, dve.var))
                        for (Dsymbol s = sc.func; s; s = s.toParentLocal())
                    {
                        FuncDeclaration ff = s.isFuncDeclaration();
                        if (!ff)
                            break;
                        if (!ff.type.isMutable)
                        {
                            error(loc, "cannot modify `%s` in `%s` function", toChars(), MODtoChars(type.mod));
                            return ErrorExp.get();
                        }
                    }
                }
                error(loc, "cannot modify `%s` expression `%s`", MODtoChars(type.mod), toChars());
                return ErrorExp.get();
            }
            else if (!type.isAssignable())
            {
                error(loc, "cannot modify struct instance `%s` of type `%s` because it contains `const` or `immutable` members",
                    toChars(), type.toChars());
                return ErrorExp.get();
            }
        }
        return toLvalue(sc, e);
    }

    final Expression implicitCastTo(Scope* sc, Type t)
    {
        return .implicitCastTo(this, sc, t);
    }

    final MATCH implicitConvTo(Type t)
    {
        return .implicitConvTo(this, t);
    }

    final Expression castTo(Scope* sc, Type t)
    {
        return .castTo(this, sc, t);
    }

    /****************************************
     * Resolve __FILE__, __LINE__, __MODULE__, __FUNCTION__, __PRETTY_FUNCTION__, __FILE_FULL_PATH__ to loc.
     */
    Expression resolveLoc(const ref Loc loc, Scope* sc)
    {
        this.loc = loc;
        return this;
    }

    /****************************************
     * Check that the expression has a valid type.
     * If not, generates an error "... has no type".
     * Returns:
     *      true if the expression is not valid.
     * Note:
     *      When this function returns true, `checkValue()` should also return true.
     */
    bool checkType()
    {
        return false;
    }

    /****************************************
     * Check that the expression has a valid value.
     * If not, generates an error "... has no value".
     * Returns:
     *      true if the expression is not valid or has void type.
     */
    bool checkValue()
    {
        if (type && type.toBasetype().ty == Tvoid)
        {
            error(loc, "expression `%s` is `void` and has no value", toChars());
            //print(); assert(0);
            if (!global.gag)
                type = Type.terror;
            return true;
        }
        return false;
    }

    extern (D) final bool checkScalar()
    {
        if (op == EXP.error)
            return true;
        if (type.toBasetype().ty == Terror)
            return true;
        if (!type.isscalar())
        {
            error(loc, "`%s` is not a scalar, it is a `%s`", toChars(), type.toChars());
            return true;
        }
        return checkValue();
    }

    extern (D) final bool checkNoBool()
    {
        if (op == EXP.error)
            return true;
        if (type.toBasetype().ty == Terror)
            return true;
        if (type.toBasetype().ty == Tbool)
        {
            error(loc, "operation not allowed on `bool` `%s`", toChars());
            return true;
        }
        return false;
    }

    extern (D) final bool checkIntegral()
    {
        if (op == EXP.error)
            return true;
        if (type.toBasetype().ty == Terror)
            return true;
        if (!type.isintegral())
        {
            error(loc, "`%s` is not of integral type, it is a `%s`", toChars(), type.toChars());
            return true;
        }
        return checkValue();
    }

    extern (D) final bool checkArithmetic(EXP op)
    {
        if (op == EXP.error)
            return true;
        if (type.toBasetype().ty == Terror)
            return true;
        if (!type.isintegral() && !type.isfloating())
        {
            // unary aggregate ops error here
            const char* msg = type.isAggregate() ?
                "operator `%s` is not defined for `%s` of type `%s`" :
                "illegal operator `%s` for `%s` of type `%s`";
            error(loc, msg, EXPtoString(op).ptr, toChars(), type.toChars());
            return true;
        }
        return checkValue();
    }

    final bool checkDeprecated(Scope* sc, Dsymbol s)
    {
        return s.checkDeprecated(loc, sc);
    }

    extern (D) final bool checkDisabled(Scope* sc, Dsymbol s)
    {
        if (auto d = s.isDeclaration())
        {
            return d.checkDisabled(loc, sc);
        }

        return false;
    }

    /*********************************************
     * Calling function f.
     * Check the purity, i.e. if we're in a pure function
     * we can only call other pure functions.
     * Returns true if error occurs.
     */
    extern (D) final bool checkPurity(Scope* sc, FuncDeclaration f)
    {
        if (!sc.func)
            return false;
        if (sc.func == f)
            return false;
        if (sc.intypeof == 1)
            return false;
        if (sc.flags & (SCOPE.ctfe | SCOPE.debug_))
            return false;

        // If the call has a pure parent, then the called func must be pure.
        if (!f.isPure() && checkImpure(sc, loc, null, f))
        {
            error(loc, "`pure` %s `%s` cannot call impure %s `%s`",
                sc.func.kind(), sc.func.toPrettyChars(), f.kind(),
                f.toPrettyChars());

            if (!f.isDtorDeclaration())
                errorSupplementalInferredAttr(f, /*max depth*/ 10, /*deprecation*/ false, STC.pure_);

            checkOverriddenDtor(sc, f, dd => dd.type.toTypeFunction().purity != PURE.impure, "impure");
            return true;
        }
        return false;
    }

    /**
     * Checks whether `f` is a generated `DtorDeclaration` that hides a user-defined one
     * which passes `check` while `f` doesn't (e.g. when the user defined dtor is pure but
     * the generated dtor is not).
     * In that case the method will identify and print all members causing the attribute
     * missmatch.
     *
     * Params:
     *   sc = scope
     *   f  = potential `DtorDeclaration`
     *   check = current check (e.g. whether it's pure)
     *   checkName = the kind of check (e.g. `"pure"`)
     */
    extern (D) final void checkOverriddenDtor(Scope* sc, FuncDeclaration f,
                scope bool function(DtorDeclaration) check, const string checkName
    ) {
        auto dd = f.isDtorDeclaration();
        if (!dd || !dd.isGenerated())
            return;

        // DtorDeclaration without parents should fail at an earlier stage
        auto ad = cast(AggregateDeclaration) f.toParent2();
        assert(ad);

        if (ad.userDtors.length)
        {
            if (!check(ad.userDtors[0])) // doesn't match check (e.g. is impure as well)
                return;

            // Sanity check
            assert(!check(ad.fieldDtor));
        }

        dd.loc.errorSupplemental("%s`%s.~this` is %.*s because of the following field's destructors:",
                            dd.isGenerated() ? "generated " : "".ptr,
                            ad.toChars,
                            cast(int) checkName.length, checkName.ptr);

        // Search for the offending fields
        foreach (field; ad.fields)
        {
            // Only structs may define automatically called destructors
            auto ts = field.type.isTypeStruct();
            if (!ts)
            {
                // But they might be part of a static array
                auto ta = field.type.isTypeSArray();
                if (!ta)
                    continue;

                ts = ta.baseElemOf().isTypeStruct();
                if (!ts)
                    continue;
            }

            auto fieldSym = ts.toDsymbol(sc);
            assert(fieldSym); // Resolving ts must succeed because missing defs. should error before

            auto fieldSd = fieldSym.isStructDeclaration();
            assert(fieldSd); // ts is a TypeStruct, this would imply a malformed ASR

            if (fieldSd.dtor && !check(fieldSd.dtor))
            {
                field.loc.errorSupplemental(" - %s %s", field.type.toChars(), field.toChars());

                if (fieldSd.dtor.isGenerated())
                    checkOverriddenDtor(sc, fieldSd.dtor, check, checkName);
                else
                    fieldSd.dtor.loc.errorSupplemental("   %.*s `%s.~this` is declared here",
                                            cast(int) checkName.length, checkName.ptr, fieldSd.toChars());
            }
        }
    }

    /*******************************************
     * Accessing variable v.
     * Check for purity and safety violations.
     * Returns true if error occurs.
     */
    extern (D) final bool checkPurity(Scope* sc, VarDeclaration v)
    {
        //printf("v = %s %s\n", v.type.toChars(), v.toChars());
        /* Look for purity and safety violations when accessing variable v
         * from current function.
         */
        if (!sc.func)
            return false;
        if (sc.intypeof == 1)
            return false; // allow violations inside typeof(expression)
        if (sc.flags & (SCOPE.ctfe | SCOPE.debug_))
            return false; // allow violations inside compile-time evaluated expressions and debug conditionals
        if (v.ident == Id.ctfe)
            return false; // magic variable never violates pure and safe
        if (v.isImmutable())
            return false; // always safe and pure to access immutables...
        if (v.isConst() && !v.isReference() && (v.isDataseg() || v.isParameter()) && v.type.implicitConvTo(v.type.immutableOf()))
            return false; // or const global/parameter values which have no mutable indirections
        if (v.storage_class & STC.manifest)
            return false; // ...or manifest constants

        // accessing empty structs is pure
        // https://issues.dlang.org/show_bug.cgi?id=18694
        // https://issues.dlang.org/show_bug.cgi?id=21464
        // https://issues.dlang.org/show_bug.cgi?id=23589
        if (v.type.ty == Tstruct)
        {
            StructDeclaration sd = (cast(TypeStruct)v.type).sym;
            if (sd.members) // not opaque
            {
                if (sd.semanticRun >= PASS.semanticdone)
                    sd.determineSize(v.loc);
                if (sd.hasNoFields)
                    return false;
            }
        }

        bool err = false;
        if (v.isDataseg())
        {
            // https://issues.dlang.org/show_bug.cgi?id=7533
            // Accessing implicit generated __gate is pure.
            if (v.ident == Id.gate)
                return false;

            if (checkImpure(sc, loc, "`pure` %s `%s` cannot access mutable static data `%s`", v))
            {
                error(loc, "`pure` %s `%s` cannot access mutable static data `%s`",
                    sc.func.kind(), sc.func.toPrettyChars(), v.toChars());
                err = true;
            }
        }
        else
        {
            /* Given:
             * void f() {
             *   int fx;
             *   pure void g() {
             *     int gx;
             *     /+pure+/ void h() {
             *       int hx;
             *       /+pure+/ void i() { }
             *     }
             *   }
             * }
             * i() can modify hx and gx but not fx
             */

            Dsymbol vparent = v.toParent2();
            for (Dsymbol s = sc.func; !err && s; s = s.toParentP(vparent))
            {
                if (s == vparent)
                    break;

                if (AggregateDeclaration ad = s.isAggregateDeclaration())
                {
                    if (ad.isNested())
                        continue;
                    break;
                }
                FuncDeclaration ff = s.isFuncDeclaration();
                if (!ff)
                    break;
                if (ff.isNested() || ff.isThis())
                {
                    if (ff.type.isImmutable() ||
                        ff.type.isShared() && !MODimplicitConv(ff.type.mod, v.type.mod))
                    {
                        OutBuffer ffbuf;
                        OutBuffer vbuf;
                        MODMatchToBuffer(&ffbuf, ff.type.mod, v.type.mod);
                        MODMatchToBuffer(&vbuf, v.type.mod, ff.type.mod);
                        error(loc, "%s%s `%s` cannot access %sdata `%s`",
                            ffbuf.peekChars(), ff.kind(), ff.toPrettyChars(), vbuf.peekChars(), v.toChars());
                        err = true;
                        break;
                    }
                    continue;
                }
                break;
            }
        }

        /* Do not allow safe functions to access __gshared data
         */
        if (v.storage_class & STC.gshared)
        {
            if (sc.setUnsafe(false, this.loc,
                "`@safe` function `%s` cannot access `__gshared` data `%s`", sc.func, v))
            {
                err = true;
            }
        }

        return err;
    }

    /*
    Check if sc.func is impure or can be made impure.
    Returns true on error, i.e. if sc.func is pure and cannot be made impure.
    */
    private static bool checkImpure(Scope* sc, Loc loc, const(char)* fmt, RootObject arg0)
    {
        return sc.func && (isRootTraitsCompilesScope(sc)
                ? sc.func.isPureBypassingInference() >= PURE.weak
                : sc.func.setImpure(loc, fmt, arg0));
    }

    /*********************************************
     * Calling function f.
     * Check the safety, i.e. if we're in a @safe function
     * we can only call @safe or @trusted functions.
     * Returns true if error occurs.
     */
    extern (D) final bool checkSafety(Scope* sc, FuncDeclaration f)
    {
        if (sc.func == f)
            return false;
        if (sc.intypeof == 1)
            return false;
        if (sc.flags & SCOPE.debug_)
            return false;
        if ((sc.flags & SCOPE.ctfe) && sc.func)
            return false;

        if (!sc.func)
        {
            if (sc.varDecl && !f.safetyInprocess && !f.isSafe() && !f.isTrusted())
            {
                if (sc.varDecl.storage_class & STC.safe)
                {
                    error(loc, "`@safe` variable `%s` cannot be initialized by calling `@system` function `%s`",
                        sc.varDecl.toChars(), f.toChars());
                    return true;
                }
                else
                {
                    sc.varDecl.storage_class |= STC.system;
                    sc.varDecl.systemInferred = true;
                }
            }
            return false;
        }

        if (!f.isSafe() && !f.isTrusted())
        {
            if (isRootTraitsCompilesScope(sc) ? sc.func.isSafeBypassingInference() : sc.func.setUnsafeCall(f))
            {
                if (!loc.isValid()) // e.g. implicitly generated dtor
                    loc = sc.func.loc;

                const prettyChars = f.toPrettyChars();
                error(loc, "`@safe` %s `%s` cannot call `@system` %s `%s`",
                    sc.func.kind(), sc.func.toPrettyChars(), f.kind(),
                    prettyChars);
                if (!f.isDtorDeclaration)
                    errorSupplementalInferredAttr(f, /*max depth*/ 10, /*deprecation*/ false, STC.safe);
                .errorSupplemental(f.loc, "`%s` is declared here", prettyChars);

                checkOverriddenDtor(sc, f, dd => dd.type.toTypeFunction().trust > TRUST.system, "@system");

                return true;
            }
        }
        else if (f.isSafe() && f.safetyViolation)
        {
            // for dip1000 by default transition, print deprecations for calling functions that will become `@system`
            if (sc.func.isSafeBypassingInference())
            {
                .deprecation(this.loc, "`@safe` function `%s` calling `%s`", sc.func.toChars(), f.toChars());
                errorSupplementalInferredAttr(f, 10, true, STC.safe);
            }
            else if (!sc.func.safetyViolation)
            {
                import dmd.func : AttributeViolation;
                sc.func.safetyViolation = new AttributeViolation(this.loc, null, f, null, null);
            }
        }
        return false;
    }

    /*********************************************
     * Calling function f.
     * Check the @nogc-ness, i.e. if we're in a @nogc function
     * we can only call other @nogc functions.
     * Returns true if error occurs.
     */
    extern (D) final bool checkNogc(Scope* sc, FuncDeclaration f)
    {
        if (!sc.func)
            return false;
        if (sc.func == f)
            return false;
        if (sc.intypeof == 1)
            return false;
        if (sc.flags & (SCOPE.ctfe | SCOPE.debug_))
            return false;
        /* The original expression (`new S(...)`) will be verified instead. This
         * is to keep errors related to the original code and not the lowering.
         */
        if (f.ident == Id._d_newitemT)
            return false;

        if (!f.isNogc())
        {
            if (isRootTraitsCompilesScope(sc) ? sc.func.isNogcBypassingInference() : sc.func.setGCCall(f))
            {
                if (loc.linnum == 0) // e.g. implicitly generated dtor
                    loc = sc.func.loc;

                // Lowered non-@nogc'd hooks will print their own error message inside of nogc.d (NOGCVisitor.visit(CallExp e)),
                // so don't print anything to avoid double error messages.
                if (!(f.ident == Id._d_HookTraceImpl || f.ident == Id._d_arraysetlengthT
                    || f.ident == Id._d_arrayappendT || f.ident == Id._d_arrayappendcTX
                    || f.ident == Id._d_arraycatnTX || f.ident == Id._d_newclassT))
                {
                    error(loc, "`@nogc` %s `%s` cannot call non-@nogc %s `%s`",
                        sc.func.kind(), sc.func.toPrettyChars(), f.kind(), f.toPrettyChars());

                    if (!f.isDtorDeclaration)
                        f.errorSupplementalInferredAttr(/*max depth*/ 10, /*deprecation*/ false, STC.nogc);
                }

                checkOverriddenDtor(sc, f, dd => dd.type.toTypeFunction().isnogc, "non-@nogc");

                return true;
            }
        }
        return false;
    }

    /********************************************
     * Check that the postblit is callable if t is an array of structs.
     * Returns true if error happens.
     */
    extern (D) final bool checkPostblit(Scope* sc, Type t)
    {
        if (auto ts = t.baseElemOf().isTypeStruct())
        {
            if (global.params.useTypeInfo && Type.dtypeinfo)
            {
                // https://issues.dlang.org/show_bug.cgi?id=11395
                // Require TypeInfo generation for array concatenation
                semanticTypeInfo(sc, t);
            }

            StructDeclaration sd = ts.sym;
            if (sd.postblit)
            {
                if (sd.postblit.checkDisabled(loc, sc))
                    return true;

                //checkDeprecated(sc, sd.postblit);        // necessary?
                checkPurity(sc, sd.postblit);
                checkSafety(sc, sd.postblit);
                checkNogc(sc, sd.postblit);
                //checkAccess(sd, loc, sc, sd.postblit);   // necessary?
                return false;
            }
        }
        return false;
    }

    extern (D) final bool checkRightThis(Scope* sc)
    {
        if (op == EXP.error)
            return true;
        if (op == EXP.variable && type.ty != Terror)
        {
            VarExp ve = cast(VarExp)this;
            if (isNeedThisScope(sc, ve.var))
            {
                //printf("checkRightThis sc.intypeof = %d, ad = %p, func = %p, fdthis = %p\n",
                //        sc.intypeof, sc.getStructClassScope(), func, fdthis);
                auto t = ve.var.isThis();
                assert(t);
                error(loc, "accessing non-static variable `%s` requires an instance of `%s`", ve.var.toChars(), t.toChars());
                return true;
            }
        }
        return false;
    }

    /*******************************
     * Check whether the expression allows RMW operations, error with rmw operator diagnostic if not.
     * ex is the RHS expression, or NULL if ++/-- is used (for diagnostics)
     * Returns true if error occurs.
     */
    extern (D) final bool checkReadModifyWrite(EXP rmwOp, Expression ex = null)
    {
        //printf("Expression::checkReadModifyWrite() %s %s", toChars(), ex ? ex.toChars() : "");
        if (!type || !type.isShared() || type.isTypeStruct() || type.isTypeClass())
            return false;

        // atomicOp uses opAssign (+=/-=) rather than opOp (++/--) for the CT string literal.
        switch (rmwOp)
        {
        case EXP.plusPlus:
        case EXP.prePlusPlus:
            rmwOp = EXP.addAssign;
            break;
        case EXP.minusMinus:
        case EXP.preMinusMinus:
            rmwOp = EXP.minAssign;
            break;
        default:
            break;
        }

        error(loc, "read-modify-write operations are not allowed for `shared` variables");
        errorSupplemental(loc, "Use `core.atomic.atomicOp!\"%s\"(%s, %s)` instead",
                          EXPtoString(rmwOp).ptr, toChars(), ex ? ex.toChars() : "1");
        return true;
    }

    /************************************************
     * Destructors are attached to VarDeclarations.
     * Hence, if expression returns a temp that needs a destructor,
     * make sure and create a VarDeclaration for that temp.
     */
    Expression addDtorHook(Scope* sc)
    {
        return this;
    }

    /******************************
     * Take address of expression.
     */
    final Expression addressOf()
    {
        //printf("Expression::addressOf()\n");
        debug
        {
            assert(op == EXP.error || isLvalue());
        }
        Expression e = new AddrExp(loc, this, type.pointerTo());
        return e;
    }

    /******************************
     * If this is a reference, dereference it.
     */
    final Expression deref()
    {
        //printf("Expression::deref()\n");
        // type could be null if forward referencing an 'auto' variable
        if (type)
            if (auto tr = type.isTypeReference())
            {
                Expression e = new PtrExp(loc, this, tr.next);
                return e;
            }
        return this;
    }

    final Expression optimize(int result, bool keepLvalue = false)
    {
        return Expression_optimize(this, result, keepLvalue);
    }

    // Entry point for CTFE.
    // A compile-time result is required. Give an error if not possible
    final Expression ctfeInterpret()
    {
        return .ctfeInterpret(this);
    }

    final int isConst()
    {
        return .isConst(this);
    }

    /******
     * Identical, not just equal. I.e. NaNs with different bit patterns are not identical
     */
    bool isIdentical(const Expression e) const
    {
        return equals(e);
    }


    /// Statically evaluate this expression to a `bool` if possible
    /// Returns: an optional thath either contains the value or is empty
    Optional!bool toBool()
    {
        return typeof(return)();
    }

    bool hasCode()
    {
        return true;
    }

    final pure inout nothrow @nogc @safe
    {
        inout(IntegerExp)   isIntegerExp() { return op == EXP.int64 ? cast(typeof(return))this : null; }
        inout(ErrorExp)     isErrorExp() { return op == EXP.error ? cast(typeof(return))this : null; }
        inout(VoidInitExp)  isVoidInitExp() { return op == EXP.void_ ? cast(typeof(return))this : null; }
        inout(RealExp)      isRealExp() { return op == EXP.float64 ? cast(typeof(return))this : null; }
        inout(ComplexExp)   isComplexExp() { return op == EXP.complex80 ? cast(typeof(return))this : null; }
        inout(IdentifierExp) isIdentifierExp() { return op == EXP.identifier ? cast(typeof(return))this : null; }
        inout(DollarExp)    isDollarExp() { return op == EXP.dollar ? cast(typeof(return))this : null; }
        inout(DsymbolExp)   isDsymbolExp() { return op == EXP.dSymbol ? cast(typeof(return))this : null; }
        inout(ThisExp)      isThisExp() { return op == EXP.this_ ? cast(typeof(return))this : null; }
        inout(SuperExp)     isSuperExp() { return op == EXP.super_ ? cast(typeof(return))this : null; }
        inout(NullExp)      isNullExp() { return op == EXP.null_ ? cast(typeof(return))this : null; }
        inout(StringExp)    isStringExp() { return op == EXP.string_ ? cast(typeof(return))this : null; }
        inout(TupleExp)     isTupleExp() { return op == EXP.tuple ? cast(typeof(return))this : null; }
        inout(ArrayLiteralExp) isArrayLiteralExp() { return op == EXP.arrayLiteral ? cast(typeof(return))this : null; }
        inout(AssocArrayLiteralExp) isAssocArrayLiteralExp() { return op == EXP.assocArrayLiteral ? cast(typeof(return))this : null; }
        inout(StructLiteralExp) isStructLiteralExp() { return op == EXP.structLiteral ? cast(typeof(return))this : null; }
        inout(CompoundLiteralExp) isCompoundLiteralExp() { return op == EXP.compoundLiteral ? cast(typeof(return))this : null; }
        inout(TypeExp)      isTypeExp() { return op == EXP.type ? cast(typeof(return))this : null; }
        inout(ScopeExp)     isScopeExp() { return op == EXP.scope_ ? cast(typeof(return))this : null; }
        inout(TemplateExp)  isTemplateExp() { return op == EXP.template_ ? cast(typeof(return))this : null; }
        inout(NewExp) isNewExp() { return op == EXP.new_ ? cast(typeof(return))this : null; }
        inout(NewAnonClassExp) isNewAnonClassExp() { return op == EXP.newAnonymousClass ? cast(typeof(return))this : null; }
        inout(SymOffExp)    isSymOffExp() { return op == EXP.symbolOffset ? cast(typeof(return))this : null; }
        inout(VarExp)       isVarExp() { return op == EXP.variable ? cast(typeof(return))this : null; }
        inout(OverExp)      isOverExp() { return op == EXP.overloadSet ? cast(typeof(return))this : null; }
        inout(FuncExp)      isFuncExp() { return op == EXP.function_ ? cast(typeof(return))this : null; }
        inout(DeclarationExp) isDeclarationExp() { return op == EXP.declaration ? cast(typeof(return))this : null; }
        inout(TypeidExp)    isTypeidExp() { return op == EXP.typeid_ ? cast(typeof(return))this : null; }
        inout(TraitsExp)    isTraitsExp() { return op == EXP.traits ? cast(typeof(return))this : null; }
        inout(HaltExp)      isHaltExp() { return op == EXP.halt ? cast(typeof(return))this : null; }
        inout(IsExp)        isExp() { return op == EXP.is_ ? cast(typeof(return))this : null; }
        inout(MixinExp)     isMixinExp() { return op == EXP.mixin_ ? cast(typeof(return))this : null; }
        inout(ImportExp)    isImportExp() { return op == EXP.import_ ? cast(typeof(return))this : null; }
        inout(AssertExp)    isAssertExp() { return op == EXP.assert_ ? cast(typeof(return))this : null; }
        inout(ThrowExp)     isThrowExp() { return op == EXP.throw_ ? cast(typeof(return))this : null; }
        inout(DotIdExp)     isDotIdExp() { return op == EXP.dotIdentifier ? cast(typeof(return))this : null; }
        inout(DotTemplateExp) isDotTemplateExp() { return op == EXP.dotTemplateDeclaration ? cast(typeof(return))this : null; }
        inout(DotVarExp)    isDotVarExp() { return op == EXP.dotVariable ? cast(typeof(return))this : null; }
        inout(DotTemplateInstanceExp) isDotTemplateInstanceExp() { return op == EXP.dotTemplateInstance ? cast(typeof(return))this : null; }
        inout(DelegateExp)  isDelegateExp() { return op == EXP.delegate_ ? cast(typeof(return))this : null; }
        inout(DotTypeExp)   isDotTypeExp() { return op == EXP.dotType ? cast(typeof(return))this : null; }
        inout(CallExp)      isCallExp() { return op == EXP.call ? cast(typeof(return))this : null; }
        inout(AddrExp)      isAddrExp() { return op == EXP.address ? cast(typeof(return))this : null; }
        inout(PtrExp)       isPtrExp() { return op == EXP.star ? cast(typeof(return))this : null; }
        inout(NegExp)       isNegExp() { return op == EXP.negate ? cast(typeof(return))this : null; }
        inout(UAddExp)      isUAddExp() { return op == EXP.uadd ? cast(typeof(return))this : null; }
        inout(ComExp)       isComExp() { return op == EXP.tilde ? cast(typeof(return))this : null; }
        inout(NotExp)       isNotExp() { return op == EXP.not ? cast(typeof(return))this : null; }
        inout(DeleteExp)    isDeleteExp() { return op == EXP.delete_ ? cast(typeof(return))this : null; }
        inout(CastExp)      isCastExp() { return op == EXP.cast_ ? cast(typeof(return))this : null; }
        inout(VectorExp)    isVectorExp() { return op == EXP.vector ? cast(typeof(return))this : null; }
        inout(VectorArrayExp) isVectorArrayExp() { return op == EXP.vectorArray ? cast(typeof(return))this : null; }
        inout(SliceExp)     isSliceExp() { return op == EXP.slice ? cast(typeof(return))this : null; }
        inout(ArrayLengthExp) isArrayLengthExp() { return op == EXP.arrayLength ? cast(typeof(return))this : null; }
        inout(ArrayExp)     isArrayExp() { return op == EXP.array ? cast(typeof(return))this : null; }
        inout(DotExp)       isDotExp() { return op == EXP.dot ? cast(typeof(return))this : null; }
        inout(CommaExp)     isCommaExp() { return op == EXP.comma ? cast(typeof(return))this : null; }
        inout(IntervalExp)  isIntervalExp() { return op == EXP.interval ? cast(typeof(return))this : null; }
        inout(DelegatePtrExp)     isDelegatePtrExp() { return op == EXP.delegatePointer ? cast(typeof(return))this : null; }
        inout(DelegateFuncptrExp) isDelegateFuncptrExp() { return op == EXP.delegateFunctionPointer ? cast(typeof(return))this : null; }
        inout(IndexExp)     isIndexExp() { return op == EXP.index ? cast(typeof(return))this : null; }
        inout(PostExp)      isPostExp()  { return (op == EXP.plusPlus || op == EXP.minusMinus) ? cast(typeof(return))this : null; }
        inout(PreExp)       isPreExp()   { return (op == EXP.prePlusPlus || op == EXP.preMinusMinus) ? cast(typeof(return))this : null; }
        inout(AssignExp)    isAssignExp()    { return op == EXP.assign ? cast(typeof(return))this : null; }
        inout(LoweredAssignExp)    isLoweredAssignExp()    { return op == EXP.loweredAssignExp ? cast(typeof(return))this : null; }
        inout(ConstructExp) isConstructExp() { return op == EXP.construct ? cast(typeof(return))this : null; }
        inout(BlitExp)      isBlitExp()      { return op == EXP.blit ? cast(typeof(return))this : null; }
        inout(AddAssignExp) isAddAssignExp() { return op == EXP.addAssign ? cast(typeof(return))this : null; }
        inout(MinAssignExp) isMinAssignExp() { return op == EXP.minAssign ? cast(typeof(return))this : null; }
        inout(MulAssignExp) isMulAssignExp() { return op == EXP.mulAssign ? cast(typeof(return))this : null; }

        inout(DivAssignExp) isDivAssignExp() { return op == EXP.divAssign ? cast(typeof(return))this : null; }
        inout(ModAssignExp) isModAssignExp() { return op == EXP.modAssign ? cast(typeof(return))this : null; }
        inout(AndAssignExp) isAndAssignExp() { return op == EXP.andAssign ? cast(typeof(return))this : null; }
        inout(OrAssignExp)  isOrAssignExp()  { return op == EXP.orAssign ? cast(typeof(return))this : null; }
        inout(XorAssignExp) isXorAssignExp() { return op == EXP.xorAssign ? cast(typeof(return))this : null; }
        inout(PowAssignExp) isPowAssignExp() { return op == EXP.powAssign ? cast(typeof(return))this : null; }

        inout(ShlAssignExp)  isShlAssignExp()  { return op == EXP.leftShiftAssign ? cast(typeof(return))this : null; }
        inout(ShrAssignExp)  isShrAssignExp()  { return op == EXP.rightShiftAssign ? cast(typeof(return))this : null; }
        inout(UshrAssignExp) isUshrAssignExp() { return op == EXP.unsignedRightShiftAssign ? cast(typeof(return))this : null; }

        inout(CatAssignExp) isCatAssignExp() { return op == EXP.concatenateAssign
                                                ? cast(typeof(return))this
                                                : null; }

        inout(CatElemAssignExp) isCatElemAssignExp() { return op == EXP.concatenateElemAssign
                                                ? cast(typeof(return))this
                                                : null; }

        inout(CatDcharAssignExp) isCatDcharAssignExp() { return op == EXP.concatenateDcharAssign
                                                ? cast(typeof(return))this
                                                : null; }

        inout(AddExp)      isAddExp() { return op == EXP.add ? cast(typeof(return))this : null; }
        inout(MinExp)      isMinExp() { return op == EXP.min ? cast(typeof(return))this : null; }
        inout(CatExp)      isCatExp() { return op == EXP.concatenate ? cast(typeof(return))this : null; }
        inout(MulExp)      isMulExp() { return op == EXP.mul ? cast(typeof(return))this : null; }
        inout(DivExp)      isDivExp() { return op == EXP.div ? cast(typeof(return))this : null; }
        inout(ModExp)      isModExp() { return op == EXP.mod ? cast(typeof(return))this : null; }
        inout(PowExp)      isPowExp() { return op == EXP.pow ? cast(typeof(return))this : null; }
        inout(ShlExp)      isShlExp() { return op == EXP.leftShift ? cast(typeof(return))this : null; }
        inout(ShrExp)      isShrExp() { return op == EXP.rightShift ? cast(typeof(return))this : null; }
        inout(UshrExp)     isUshrExp() { return op == EXP.unsignedRightShift ? cast(typeof(return))this : null; }
        inout(AndExp)      isAndExp() { return op == EXP.and ? cast(typeof(return))this : null; }
        inout(OrExp)       isOrExp() { return op == EXP.or ? cast(typeof(return))this : null; }
        inout(XorExp)      isXorExp() { return op == EXP.xor ? cast(typeof(return))this : null; }
        inout(LogicalExp)  isLogicalExp() { return (op == EXP.andAnd || op == EXP.orOr) ? cast(typeof(return))this : null; }
        //inout(CmpExp)    isCmpExp() { return op == EXP. ? cast(typeof(return))this : null; }
        inout(InExp)       isInExp() { return op == EXP.in_ ? cast(typeof(return))this : null; }
        inout(RemoveExp)   isRemoveExp() { return op == EXP.remove ? cast(typeof(return))this : null; }
        inout(EqualExp)    isEqualExp() { return (op == EXP.equal || op == EXP.notEqual) ? cast(typeof(return))this : null; }
        inout(IdentityExp) isIdentityExp() { return (op == EXP.identity || op == EXP.notIdentity) ? cast(typeof(return))this : null; }
        inout(CondExp)     isCondExp() { return op == EXP.question ? cast(typeof(return))this : null; }
        inout(GenericExp)  isGenericExp() { return op == EXP._Generic ? cast(typeof(return))this : null; }
        inout(DefaultInitExp)    isDefaultInitExp() { return
            (op == EXP.prettyFunction    || op == EXP.functionString ||
             op == EXP.line              || op == EXP.moduleString   ||
             op == EXP.file              || op == EXP.fileFullPath   ) ? cast(typeof(return))this : null; }
        inout(FileInitExp)       isFileInitExp() { return (op == EXP.file || op == EXP.fileFullPath) ? cast(typeof(return))this : null; }
        inout(LineInitExp)       isLineInitExp() { return op == EXP.line ? cast(typeof(return))this : null; }
        inout(ModuleInitExp)     isModuleInitExp() { return op == EXP.moduleString ? cast(typeof(return))this : null; }
        inout(FuncInitExp)       isFuncInitExp() { return op == EXP.functionString ? cast(typeof(return))this : null; }
        inout(PrettyFuncInitExp) isPrettyFuncInitExp() { return op == EXP.prettyFunction ? cast(typeof(return))this : null; }
        inout(ObjcClassReferenceExp) isObjcClassReferenceExp() { return op == EXP.objcClassReference ? cast(typeof(return))this : null; }
        inout(ClassReferenceExp) isClassReferenceExp() { return op == EXP.classReference ? cast(typeof(return))this : null; }
        inout(ThrownExceptionExp) isThrownExceptionExp() { return op == EXP.thrownException ? cast(typeof(return))this : null; }

        inout(UnaExp) isUnaExp() pure inout nothrow @nogc
        {
            return exptab[op] & EXPFLAGS.unary ? cast(typeof(return))this : null;
        }

        inout(BinExp) isBinExp() pure inout nothrow @nogc
        {
            return exptab[op] & EXPFLAGS.binary ? cast(typeof(return))this : null;
        }

        inout(BinAssignExp) isBinAssignExp() pure inout nothrow @nogc
        {
            return exptab[op] & EXPFLAGS.binaryAssign ? cast(typeof(return))this : null;
        }
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * A compile-time known integer value
 */
extern (C++) final class IntegerExp : Expression
{
    private dinteger_t value;

    extern (D) this(const ref Loc loc, dinteger_t value, Type type)
    {
        super(loc, EXP.int64);
        //printf("IntegerExp(value = %lld, type = '%s')\n", value, type ? type.toChars() : "");
        assert(type);
        if (!type.isscalar())
        {
            //printf("%s, loc = %d\n", toChars(), loc.linnum);
            if (type.ty != Terror)
                error(loc, "integral constant must be scalar type, not `%s`", type.toChars());
            type = Type.terror;
        }
        this.type = type;
        this.value = normalize(type.toBasetype().ty, value);
    }

    extern (D) this(dinteger_t value)
    {
        super(Loc.initial, EXP.int64);
        this.type = Type.tint32;
        this.value = cast(int)value;
    }

    static IntegerExp create(const ref Loc loc, dinteger_t value, Type type)
    {
        return new IntegerExp(loc, value, type);
    }

    // Same as create, but doesn't allocate memory.
    static void emplace(UnionExp* pue, const ref Loc loc, dinteger_t value, Type type)
    {
        emplaceExp!(IntegerExp)(pue, loc, value, type);
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        if (auto ne = (cast(Expression)o).isIntegerExp())
        {
            if (type.toHeadMutable().equals(ne.type.toHeadMutable()) && value == ne.value)
            {
                return true;
            }
        }
        return false;
    }

    override dinteger_t toInteger()
    {
        // normalize() is necessary until we fix all the paints of 'type'
        return value = normalize(type.toBasetype().ty, value);
    }

    override real_t toReal()
    {
        // normalize() is necessary until we fix all the paints of 'type'
        const ty = type.toBasetype().ty;
        const val = normalize(ty, value);
        value = val;
        return (ty == Tuns64)
            ? real_t(cast(ulong)val)
            : real_t(cast(long)val);
    }

    override real_t toImaginary()
    {
        return CTFloat.zero;
    }

    override complex_t toComplex()
    {
        return complex_t(toReal());
    }

    override Optional!bool toBool()
    {
        bool r = toInteger() != 0;
        return typeof(return)(r);
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        if (!e)
            e = this;
        else if (!loc.isValid())
            loc = e.loc;
        error(e.loc, "cannot modify constant `%s`", e.toChars());
        return ErrorExp.get();
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }

    dinteger_t getInteger()
    {
        return value;
    }

    void setInteger(dinteger_t value)
    {
        this.value = normalize(type.toBasetype().ty, value);
    }

    extern (D) static dinteger_t normalize(TY ty, dinteger_t value)
    {
        /* 'Normalize' the value of the integer to be in range of the type
         */
        dinteger_t result;
        switch (ty)
        {
        case Tbool:
            result = (value != 0);
            break;

        case Tint8:
            result = cast(byte)value;
            break;

        case Tchar:
        case Tuns8:
            result = cast(ubyte)value;
            break;

        case Tint16:
            result = cast(short)value;
            break;

        case Twchar:
        case Tuns16:
            result = cast(ushort)value;
            break;

        case Tint32:
            result = cast(int)value;
            break;

        case Tdchar:
        case Tuns32:
            result = cast(uint)value;
            break;

        case Tint64:
            result = cast(long)value;
            break;

        case Tuns64:
            result = cast(ulong)value;
            break;

        case Tpointer:
            if (target.ptrsize == 8)
                goto case Tuns64;
            if (target.ptrsize == 4)
                goto case Tuns32;
            if (target.ptrsize == 2)
                goto case Tuns16;
            assert(0);

        default:
            break;
        }
        return result;
    }

    override IntegerExp syntaxCopy()
    {
        return this;
    }

    /**
     * Use this instead of creating new instances for commonly used literals
     * such as 0 or 1.
     *
     * Parameters:
     *      v = The value of the expression
     * Returns:
     *      A static instance of the expression, typed as `Tint32`.
     */
    static IntegerExp literal(int v)()
    {
        __gshared IntegerExp theConstant;
        if (!theConstant)
            theConstant = new IntegerExp(v);
        return theConstant;
    }

    /**
     * Use this instead of creating new instances for commonly used bools.
     *
     * Parameters:
     *      b = The value of the expression
     * Returns:
     *      A static instance of the expression, typed as `Type.tbool`.
     */
    static IntegerExp createBool(bool b)
    {
        __gshared IntegerExp trueExp, falseExp;
        if (!trueExp)
        {
            trueExp = new IntegerExp(Loc.initial, 1, Type.tbool);
            falseExp = new IntegerExp(Loc.initial, 0, Type.tbool);
        }
        return b ? trueExp : falseExp;
    }
}

/***********************************************************
 * Use this expression for error recovery.
 *
 * It should behave as a 'sink' to prevent further cascaded error messages.
 */
extern (C++) final class ErrorExp : Expression
{
    private extern (D) this()
    {
        super(Loc.initial, EXP.error);
        type = Type.terror;
    }

    static ErrorExp get ()
    {
        if (errorexp is null)
            errorexp = new ErrorExp();

        if (global.errors == 0 && global.gaggedErrors == 0)
        {
            /* Unfortunately, errors can still leak out of gagged errors,
              * and we need to set the error count to prevent bogus code
              * generation. At least give a message.
              */
            .error(Loc.initial, "unknown, please file report on issues.dlang.org");
        }

        return errorexp;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        return this;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }

    extern (C++) __gshared ErrorExp errorexp; // handy shared value
}


/***********************************************************
 * An uninitialized value,
 * generated from void initializers.
 *
 * https://dlang.org/spec/declaration.html#void_init
 */
extern (C++) final class VoidInitExp : Expression
{
    VarDeclaration var; /// the variable from where the void value came from, null if not known
                        /// Useful for error messages

    extern (D) this(VarDeclaration var) @safe
    {
        super(var.loc, EXP.void_);
        this.var = var;
        this.type = var.type;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}


/***********************************************************
 * A compile-time known floating point number
 */
extern (C++) final class RealExp : Expression
{
    real_t value;

    extern (D) this(const ref Loc loc, real_t value, Type type) @safe
    {
        super(loc, EXP.float64);
        //printf("RealExp::RealExp(%Lg)\n", value);
        this.value = value;
        this.type = type;
    }

    static RealExp create(const ref Loc loc, real_t value, Type type) @safe
    {
        return new RealExp(loc, value, type);
    }

    // Same as create, but doesn't allocate memory.
    static void emplace(UnionExp* pue, const ref Loc loc, real_t value, Type type)
    {
        emplaceExp!(RealExp)(pue, loc, value, type);
    }

    /********************************
     * Test to see if two reals are the same.
     * Regard NaN's as equivalent.
     * Regard +0 and -0 as different.
     * Params:
     *      x1 = first operand
     *      x2 = second operand
     * Returns:
     *      true if x1 is x2
     *      else false
     */
    private static bool RealIdentical(real_t x1, real_t x2) @safe
    {
        return (CTFloat.isNaN(x1) && CTFloat.isNaN(x2)) || CTFloat.isIdentical(x1, x2);
    }
    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        if (auto ne = (cast(Expression)o).isRealExp())
        {
            if (type.toHeadMutable().equals(ne.type.toHeadMutable()) && RealIdentical(value, ne.value))
            {
                return true;
            }
        }
        return false;
    }

    override bool isIdentical(const Expression e) const
    {
        if (!equals(e))
            return false;
        return CTFloat.isIdentical(value, e.isRealExp().value);
    }

    override dinteger_t toInteger()
    {
        return cast(sinteger_t)toReal();
    }

    override uinteger_t toUInteger()
    {
        return cast(uinteger_t)toReal();
    }

    override real_t toReal()
    {
        return type.isreal() ? value : CTFloat.zero;
    }

    override real_t toImaginary()
    {
        return type.isreal() ? CTFloat.zero : value;
    }

    override complex_t toComplex()
    {
        return complex_t(toReal(), toImaginary());
    }

    override Optional!bool toBool()
    {
        return typeof(return)(!!value);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * A compile-time complex number (deprecated)
 */
extern (C++) final class ComplexExp : Expression
{
    complex_t value;

    extern (D) this(const ref Loc loc, complex_t value, Type type) @safe
    {
        super(loc, EXP.complex80);
        this.value = value;
        this.type = type;
        //printf("ComplexExp::ComplexExp(%s)\n", toChars());
    }

    static ComplexExp create(const ref Loc loc, complex_t value, Type type) @safe
    {
        return new ComplexExp(loc, value, type);
    }

    // Same as create, but doesn't allocate memory.
    static void emplace(UnionExp* pue, const ref Loc loc, complex_t value, Type type)
    {
        emplaceExp!(ComplexExp)(pue, loc, value, type);
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        if (auto ne = (cast(Expression)o).isComplexExp())
        {
            if (type.toHeadMutable().equals(ne.type.toHeadMutable()) &&
                RealExp.RealIdentical(creall(value), creall(ne.value)) &&
                RealExp.RealIdentical(cimagl(value), cimagl(ne.value)))
            {
                return true;
            }
        }
        return false;
    }

    override bool isIdentical(const Expression e) const
    {
        if (!equals(e))
            return false;
        // equals() regards different NaN values as 'equals'
        auto c = e.isComplexExp();
        return CTFloat.isIdentical(creall(value), creall(c.value)) &&
               CTFloat.isIdentical(cimagl(value), cimagl(c.value));
    }

    override dinteger_t toInteger()
    {
        return cast(sinteger_t)toReal();
    }

    override uinteger_t toUInteger()
    {
        return cast(uinteger_t)toReal();
    }

    override real_t toReal()
    {
        return creall(value);
    }

    override real_t toImaginary()
    {
        return cimagl(value);
    }

    override complex_t toComplex()
    {
        return value;
    }

    override Optional!bool toBool()
    {
        return typeof(return)(!!value);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * An identifier in the context of an expression (as opposed to a declaration)
 *
 * ---
 * int x; // VarDeclaration with Identifier
 * x++; // PostExp with IdentifierExp
 * ---
 */
extern (C++) class IdentifierExp : Expression
{
    Identifier ident;
    bool parens;        // if it appears as (identifier)

    extern (D) this(const ref Loc loc, Identifier ident) scope @safe
    {
        super(loc, EXP.identifier);
        this.ident = ident;
    }

    static IdentifierExp create(const ref Loc loc, Identifier ident) @safe
    {
        return new IdentifierExp(loc, ident);
    }

    override final bool isLvalue()
    {
        return true;
    }

    override final Expression toLvalue(Scope* sc, Expression e)
    {
        return this;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * The dollar operator used when indexing or slicing an array. E.g `a[$]`, `a[1 .. $]` etc.
 *
 * https://dlang.org/spec/arrays.html#array-length
 */
extern (C++) final class DollarExp : IdentifierExp
{
    extern (D) this(const ref Loc loc)
    {
        super(loc, Id.dollar);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Won't be generated by parser.
 */
extern (C++) final class DsymbolExp : Expression
{
    Dsymbol s;
    bool hasOverloads;

    extern (D) this(const ref Loc loc, Dsymbol s, bool hasOverloads = true) @safe
    {
        super(loc, EXP.dSymbol);
        this.s = s;
        this.hasOverloads = hasOverloads;
    }

    override bool isLvalue()
    {
        return true;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        return this;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * https://dlang.org/spec/expression.html#this
 */
extern (C++) class ThisExp : Expression
{
    VarDeclaration var;

    extern (D) this(const ref Loc loc) @safe
    {
        super(loc, EXP.this_);
        //printf("ThisExp::ThisExp() loc = %d\n", loc.linnum);
    }

    this(const ref Loc loc, const EXP tok) @safe
    {
        super(loc, tok);
        //printf("ThisExp::ThisExp() loc = %d\n", loc.linnum);
    }

    override ThisExp syntaxCopy()
    {
        auto r = cast(ThisExp) super.syntaxCopy();
        // require new semantic (possibly new `var` etc.)
        r.type = null;
        r.var = null;
        return r;
    }

    override Optional!bool toBool()
    {
        // `this` is never null (what about structs?)
        return typeof(return)(true);
    }

    override bool isLvalue()
    {
        return true;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        return this;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * https://dlang.org/spec/expression.html#super
 */
extern (C++) final class SuperExp : ThisExp
{
    extern (D) this(const ref Loc loc) @safe
    {
        super(loc, EXP.super_);
    }

    override bool isLvalue()
    {
        // Class `super` should be an rvalue
        return false;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        // Class `super` is an rvalue
        return Expression.toLvalue(sc, e);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * A compile-time known `null` value
 *
 * https://dlang.org/spec/expression.html#null
 */
extern (C++) final class NullExp : Expression
{
    extern (D) this(const ref Loc loc, Type type = null) scope @safe
    {
        super(loc, EXP.null_);
        this.type = type;
    }

    override bool equals(const RootObject o) const
    {
        if (auto e = o.isExpression())
        {
            if (e.op == EXP.null_ && type.equals(e.type))
            {
                return true;
            }
        }
        return false;
    }

    override Optional!bool toBool()
    {
        // null in any type is false
        return typeof(return)(false);
    }

    override StringExp toStringExp()
    {
        if (implicitConvTo(Type.tstring))
        {
            auto se = new StringExp(loc, (cast(char*)mem.xcalloc(1, 1))[0 .. 0]);
            se.type = Type.tstring;
            return se;
        }
        return null;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * https://dlang.org/spec/expression.html#string_literals
 */
extern (C++) final class StringExp : Expression
{
    char postfix = NoPostfix;   // 'c', 'w', 'd'
    OwnedBy ownedByCtfe = OwnedBy.code;
    private union
    {
        char* string;   // if sz == 1
        wchar* wstring; // if sz == 2
        dchar* dstring; // if sz == 4
    }                   // (const if ownedByCtfe == OwnedBy.code)
    size_t len;         // number of code units
    ubyte sz = 1;       // 1: char, 2: wchar, 4: dchar

    /**
     *  Whether the string literal's type is fixed
     *  Example:
     *  ---
     *  wstring x = "abc"; // OK, string literal is flexible
     *  wstring y = cast(string) "abc"; // Error: type was committed after cast
     *  ---
     */
    bool committed;

    /// If the string is parsed from a hex string literal
    bool hexString = false;

    enum char NoPostfix = 0;

    extern (D) this(const ref Loc loc, const(void)[] string) scope
    {
        super(loc, EXP.string_);
        this.string = cast(char*)string.ptr; // note that this.string should be const
        this.len = string.length;
        this.sz = 1;                    // work around LDC bug #1286
    }

    extern (D) this(const ref Loc loc, const(void)[] string, size_t len, ubyte sz, char postfix = NoPostfix) scope
    {
        super(loc, EXP.string_);
        this.string = cast(char*)string.ptr; // note that this.string should be const
        this.len = len;
        this.sz = sz;
        this.postfix = postfix;
    }

    static StringExp create(const ref Loc loc, const(char)* s)
    {
        return new StringExp(loc, s.toDString());
    }

    static StringExp create(const ref Loc loc, const(void)* string, size_t len)
    {
        return new StringExp(loc, string[0 .. len]);
    }

    // Same as create, but doesn't allocate memory.
    static void emplace(UnionExp* pue, const ref Loc loc, const(char)* s)
    {
        emplaceExp!(StringExp)(pue, loc, s.toDString());
    }

    extern (D) static void emplace(UnionExp* pue, const ref Loc loc, const(void)[] string)
    {
        emplaceExp!(StringExp)(pue, loc, string);
    }

    extern (D) static void emplace(UnionExp* pue, const ref Loc loc, const(void)[] string, size_t len, ubyte sz, char postfix)
    {
        emplaceExp!(StringExp)(pue, loc, string, len, sz, postfix);
    }

    override bool equals(const RootObject o) const
    {
        //printf("StringExp::equals('%s') %s\n", o.toChars(), toChars());
        if (auto e = o.isExpression())
        {
            if (auto se = e.isStringExp())
            {
                return compare(se) == 0;
            }
        }
        return false;
    }

    /**********************************
     * Return the number of code units the string would be if it were re-encoded
     * as tynto.
     * Params:
     *      tynto = code unit type of the target encoding
     * Returns:
     *      number of code units
     */
    size_t numberOfCodeUnits(int tynto = 0) const
    {
        int encSize;
        switch (tynto)
        {
            case 0:      return len;
            case Tchar:  encSize = 1; break;
            case Twchar: encSize = 2; break;
            case Tdchar: encSize = 4; break;
            default:
                assert(0);
        }
        if (sz == encSize)
            return len;

        size_t result = 0;
        dchar c;

        switch (sz)
        {
        case 1:
            for (size_t u = 0; u < len;)
            {
                if (const s = utf_decodeChar(string[0 .. len], u, c))
                {
                    error(loc, "%.*s", cast(int)s.length, s.ptr);
                    return 0;
                }
                result += utf_codeLength(encSize, c);
            }
            break;

        case 2:
            for (size_t u = 0; u < len;)
            {
                if (const s = utf_decodeWchar(wstring[0 .. len], u, c))
                {
                    error(loc, "%.*s", cast(int)s.length, s.ptr);
                    return 0;
                }
                result += utf_codeLength(encSize, c);
            }
            break;

        case 4:
            foreach (u; 0 .. len)
            {
                result += utf_codeLength(encSize, dstring[u]);
            }
            break;

        default:
            assert(0);
        }
        return result;
    }

    /**********************************************
     * Write the contents of the string to dest.
     * Use numberOfCodeUnits() to determine size of result.
     * Params:
     *  dest = destination
     *  tyto = encoding type of the result
     *  zero = add terminating 0
     */
    void writeTo(void* dest, bool zero, int tyto = 0) const
    {
        int encSize;
        switch (tyto)
        {
            case 0:      encSize = sz; break;
            case Tchar:  encSize = 1; break;
            case Twchar: encSize = 2; break;
            case Tdchar: encSize = 4; break;
            default:
                assert(0);
        }
        if (sz == encSize)
        {
            memcpy(dest, string, len * sz);
            if (zero)
                memset(dest + len * sz, 0, sz);
        }
        else
            assert(0);
    }

    /*********************************************
     * Get the code unit at index i
     * Params:
     *  i = index
     * Returns:
     *  code unit at index i
     */
    dchar getCodeUnit(size_t i) const pure
    {
        assert(i < len);
        final switch (sz)
        {
        case 1:
            return string[i];
        case 2:
            return wstring[i];
        case 4:
            return dstring[i];
        }
    }

    /*********************************************
     * Set the code unit at index i to c
     * Params:
     *  i = index
     *  c = code unit to set it to
     */
    void setCodeUnit(size_t i, dchar c)
    {
        assert(i < len);
        final switch (sz)
        {
        case 1:
            string[i] = cast(char)c;
            break;
        case 2:
            wstring[i] = cast(wchar)c;
            break;
        case 4:
            dstring[i] = c;
            break;
        }
    }

    override StringExp toStringExp()
    {
        return this;
    }

    /****************************************
     * Convert string to char[].
     */
    StringExp toUTF8(Scope* sc)
    {
        if (sz != 1)
        {
            // Convert to UTF-8 string
            committed = false;
            Expression e = castTo(sc, Type.tchar.arrayOf());
            e = e.optimize(WANTvalue);
            auto se = e.isStringExp();
            assert(se.sz == 1);
            return se;
        }
        return this;
    }

    /**
     * Compare two `StringExp` by length, then value
     *
     * The comparison is not the usual C-style comparison as seen with
     * `strcmp` or `memcmp`, but instead first compare based on the length.
     * This allows both faster lookup and sorting when comparing sparse data.
     *
     * This ordering scheme is relied on by the string-switching feature.
     * Code in Druntime's `core.internal.switch_` relies on this ordering
     * when doing a binary search among case statements.
     *
     * Both `StringExp` should be of the same encoding.
     *
     * Params:
     *   se2 = String expression to compare `this` to
     *
     * Returns:
     *   `0` when `this` is equal to se2, a value greater than `0` if
     *   `this` should be considered greater than `se2`,
     *   and a value less than `0` if `this` is lesser than `se2`.
     */
    int compare(const StringExp se2) const nothrow pure @nogc
    {
        //printf("StringExp::compare()\n");
        const len1 = len;
        const len2 = se2.len;

        assert(this.sz == se2.sz, "Comparing string expressions of different sizes");
        //printf("sz = %d, len1 = %d, len2 = %d\n", sz, cast(int)len1, cast(int)len2);
        if (len1 == len2)
        {
            switch (sz)
            {
            case 1:
                return memcmp(string, se2.string, len1);

            case 2:
                {
                    wchar* s1 = cast(wchar*)string;
                    wchar* s2 = cast(wchar*)se2.string;
                    foreach (u; 0 .. len)
                    {
                        if (s1[u] != s2[u])
                            return s1[u] - s2[u];
                    }
                }
                break;
            case 4:
                {
                    dchar* s1 = cast(dchar*)string;
                    dchar* s2 = cast(dchar*)se2.string;
                    foreach (u; 0 .. len)
                    {
                        if (s1[u] != s2[u])
                            return s1[u] - s2[u];
                    }
                }
                break;
            default:
                assert(0);
            }
        }
        return cast(int)(len1 - len2);
    }

    override Optional!bool toBool()
    {
        // Keep the old behaviour for this refactoring
        // Should probably match language spec instead and check for length
        return typeof(return)(true);
    }

    override bool isLvalue()
    {
        /* string literal is rvalue in default, but
         * conversion to reference of static array is only allowed.
         */
        return (type && type.toBasetype().ty == Tsarray);
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        //printf("StringExp::toLvalue(%s) type = %s\n", toChars(), type ? type.toChars() : NULL);
        return (type && type.toBasetype().ty == Tsarray) ? this : Expression.toLvalue(sc, e);
    }

    override Expression modifiableLvalue(Scope* sc, Expression e)
    {
        error(loc, "cannot modify string literal `%s`", toChars());
        return ErrorExp.get();
    }

    /********************************
     * Convert string contents to a 0 terminated string,
     * allocated by mem.xmalloc().
     */
    extern (D) const(char)[] toStringz() const
    {
        auto nbytes = len * sz;
        char* s = cast(char*)mem.xmalloc(nbytes + sz);
        writeTo(s, true);
        return s[0 .. nbytes];
    }

    extern (D) const(char)[] peekString() const
    {
        assert(sz == 1);
        return this.string[0 .. len];
    }

    extern (D) const(wchar)[] peekWstring() const
    {
        assert(sz == 2);
        return this.wstring[0 .. len];
    }

    extern (D) const(dchar)[] peekDstring() const
    {
        assert(sz == 4);
        return this.dstring[0 .. len];
    }

    /*******************
     * Get a slice of the data.
     */
    extern (D) const(ubyte)[] peekData() const
    {
        return cast(const(ubyte)[])this.string[0 .. len * sz];
    }

    /*******************
     * Borrow a slice of the data, so the caller can modify
     * it in-place (!)
     */
    extern (D) ubyte[] borrowData()
    {
        return cast(ubyte[])this.string[0 .. len * sz];
    }

    /***********************
     * Set new string data.
     * `this` becomes the new owner of the data.
     */
    extern (D) void setData(void* s, size_t len, ubyte sz)
    {
        this.string = cast(char*)s;
        this.len = len;
        this.sz = sz;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * A sequence of expressions
 *
 * ---
 * alias AliasSeq(T...) = T;
 * alias Tup = AliasSeq!(3, int, "abc");
 * ---
 */
extern (C++) final class TupleExp : Expression
{
    /* Tuple-field access may need to take out its side effect part.
     * For example:
     *      foo().tupleof
     * is rewritten as:
     *      (ref __tup = foo(); tuple(__tup.field0, __tup.field1, ...))
     * The declaration of temporary variable __tup will be stored in TupleExp.e0.
     */
    Expression e0;

    Expressions* exps;

    extern (D) this(const ref Loc loc, Expression e0, Expressions* exps) @safe
    {
        super(loc, EXP.tuple);
        //printf("TupleExp(this = %p)\n", this);
        this.e0 = e0;
        this.exps = exps;
    }

    extern (D) this(const ref Loc loc, Expressions* exps) @safe
    {
        super(loc, EXP.tuple);
        //printf("TupleExp(this = %p)\n", this);
        this.exps = exps;
    }

    extern (D) this(const ref Loc loc, TupleDeclaration tup)
    {
        super(loc, EXP.tuple);
        this.exps = new Expressions();

        this.exps.reserve(tup.objects.length);
        foreach (o; *tup.objects)
        {
            if (Dsymbol s = getDsymbol(o))
            {
                /* If tuple element represents a symbol, translate to DsymbolExp
                 * to supply implicit 'this' if needed later.
                 */
                Expression e = new DsymbolExp(loc, s);
                this.exps.push(e);
            }
            else if (auto eo = o.isExpression())
            {
                auto e = eo.copy();
                e.loc = loc;    // https://issues.dlang.org/show_bug.cgi?id=15669
                this.exps.push(e);
            }
            else if (auto t = o.isType())
            {
                Expression e = new TypeExp(loc, t);
                this.exps.push(e);
            }
            else
            {
                error(loc, "`%s` is not an expression", o.toChars());
            }
        }
    }

    static TupleExp create(const ref Loc loc, Expressions* exps) @safe
    {
        return new TupleExp(loc, exps);
    }

    override TupleExp syntaxCopy()
    {
        return new TupleExp(loc, e0 ? e0.syntaxCopy() : null, arraySyntaxCopy(exps));
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        if (auto e = o.isExpression())
            if (auto te = e.isTupleExp())
            {
                if (exps.length != te.exps.length)
                    return false;
                if (e0 && !e0.equals(te.e0) || !e0 && te.e0)
                    return false;
                foreach (i, e1; *exps)
                {
                    auto e2 = (*te.exps)[i];
                    if (!e1.equals(e2))
                        return false;
                }
                return true;
            }
        return false;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * [ e1, e2, e3, ... ]
 *
 * https://dlang.org/spec/expression.html#array_literals
 */
extern (C++) final class ArrayLiteralExp : Expression
{
    OwnedBy ownedByCtfe = OwnedBy.code;
    bool onstack = false;

    /** If !is null, elements[] can be sparse and basis is used for the
     * "default" element value. In other words, non-null elements[i] overrides
     * this 'basis' value.
     */
    Expression basis;

    Expressions* elements;

    extern (D) this(const ref Loc loc, Type type, Expressions* elements) @safe
    {
        super(loc, EXP.arrayLiteral);
        this.type = type;
        this.elements = elements;
    }

    extern (D) this(const ref Loc loc, Type type, Expression e)
    {
        super(loc, EXP.arrayLiteral);
        this.type = type;
        elements = new Expressions();
        elements.push(e);
    }

    extern (D) this(const ref Loc loc, Type type, Expression basis, Expressions* elements) @safe
    {
        super(loc, EXP.arrayLiteral);
        this.type = type;
        this.basis = basis;
        this.elements = elements;
    }

    static ArrayLiteralExp create(const ref Loc loc, Expressions* elements) @safe
    {
        return new ArrayLiteralExp(loc, null, elements);
    }

    // Same as create, but doesn't allocate memory.
    static void emplace(UnionExp* pue, const ref Loc loc, Expressions* elements)
    {
        emplaceExp!(ArrayLiteralExp)(pue, loc, null, elements);
    }

    override ArrayLiteralExp syntaxCopy()
    {
        return new ArrayLiteralExp(loc,
            null,
            basis ? basis.syntaxCopy() : null,
            arraySyntaxCopy(elements));
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        auto e = o.isExpression();
        if (!e)
            return false;
        if (auto ae = e.isArrayLiteralExp())
        {
            if (elements.length != ae.elements.length)
                return false;
            if (elements.length == 0 && !type.equals(ae.type))
            {
                return false;
            }

            foreach (i, e1; *elements)
            {
                auto e2 = (*ae.elements)[i];
                auto e1x = e1 ? e1 : basis;
                auto e2x = e2 ? e2 : ae.basis;

                if (e1x != e2x && (!e1x || !e2x || !e1x.equals(e2x)))
                    return false;
            }
            return true;
        }
        return false;
    }

    Expression getElement(size_t i)
    {
        return this[i];
    }

    Expression opIndex(size_t i)
    {
        auto el = (*elements)[i];
        return el ? el : basis;
    }

    override Optional!bool toBool()
    {
        size_t dim = elements ? elements.length : 0;
        return typeof(return)(dim != 0);
    }

    override StringExp toStringExp()
    {
        TY telem = type.nextOf().toBasetype().ty;
        if (telem.isSomeChar || (telem == Tvoid && (!elements || elements.length == 0)))
        {
            ubyte sz = 1;
            if (telem == Twchar)
                sz = 2;
            else if (telem == Tdchar)
                sz = 4;

            OutBuffer buf;
            if (elements)
            {
                foreach (i; 0 .. elements.length)
                {
                    auto ch = this[i];
                    if (ch.op != EXP.int64)
                        return null;
                    if (sz == 1)
                        buf.writeByte(cast(uint)ch.toInteger());
                    else if (sz == 2)
                        buf.writeword(cast(uint)ch.toInteger());
                    else
                        buf.write4(cast(uint)ch.toInteger());
                }
            }
            char prefix;
            if (sz == 1)
            {
                prefix = 'c';
                buf.writeByte(0);
            }
            else if (sz == 2)
            {
                prefix = 'w';
                buf.writeword(0);
            }
            else
            {
                prefix = 'd';
                buf.write4(0);
            }

            const size_t len = buf.length / sz - 1;
            auto se = new StringExp(loc, buf.extractSlice()[0 .. len * sz], len, sz, prefix);
            se.sz = sz;
            se.type = type;
            return se;
        }
        return null;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * [ key0 : value0, key1 : value1, ... ]
 *
 * https://dlang.org/spec/expression.html#associative_array_literals
 */
extern (C++) final class AssocArrayLiteralExp : Expression
{
    OwnedBy ownedByCtfe = OwnedBy.code;

    Expressions* keys;
    Expressions* values;
    /// Lower to core.internal.newaa for static initializaton
    Expression lowering;

    extern (D) this(const ref Loc loc, Expressions* keys, Expressions* values) @safe
    {
        super(loc, EXP.assocArrayLiteral);
        assert(keys.length == values.length);
        this.keys = keys;
        this.values = values;
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        auto e = o.isExpression();
        if (!e)
            return false;
        if (auto ae = e.isAssocArrayLiteralExp())
        {
            if (keys.length != ae.keys.length)
                return false;
            size_t count = 0;
            foreach (i, key; *keys)
            {
                foreach (j, akey; *ae.keys)
                {
                    if (key.equals(akey))
                    {
                        if (!(*values)[i].equals((*ae.values)[j]))
                            return false;
                        ++count;
                    }
                }
            }
            return count == keys.length;
        }
        return false;
    }

    override AssocArrayLiteralExp syntaxCopy()
    {
        return new AssocArrayLiteralExp(loc, arraySyntaxCopy(keys), arraySyntaxCopy(values));
    }

    override Optional!bool toBool()
    {
        size_t dim = keys.length;
        return typeof(return)(dim != 0);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

enum stageScrub             = 0x1;  /// scrubReturnValue is running
enum stageSearchPointers    = 0x2;  /// hasNonConstPointers is running
enum stageOptimize          = 0x4;  /// optimize is running
enum stageApply             = 0x8;  /// apply is running
enum stageInlineScan        = 0x10; /// inlineScan is running
enum stageToCBuffer         = 0x20; /// toCBuffer is running

/***********************************************************
 * sd( e1, e2, e3, ... )
 */
extern (C++) final class StructLiteralExp : Expression
{
    StructDeclaration sd;   /// which aggregate this is for
    Expressions* elements;  /// parallels sd.fields[] with null entries for fields to skip
    Type stype;             /// final type of result (can be different from sd's type)

    // `inlineCopy` is only used temporarily in the `inline.d` pass,
    // while `sym` is only used in `e2ir/s2ir/tocsym` which comes after
    union
    {
        Symbol* sym;            /// back end symbol to initialize with literal

        /// those fields need to prevent a infinite recursion when one field of struct initialized with 'this' pointer.
        StructLiteralExp inlinecopy;
    }

    /** pointer to the origin instance of the expression.
     * once a new expression is created, origin is set to 'this'.
     * anytime when an expression copy is created, 'origin' pointer is set to
     * 'origin' pointer value of the original expression.
     */
    StructLiteralExp origin;


    /** anytime when recursive function is calling, 'stageflags' marks with bit flag of
     * current stage and unmarks before return from this function.
     * 'inlinecopy' uses similar 'stageflags' and from multiple evaluation 'doInline'
     * (with infinite recursion) of this expression.
     */
    ubyte stageflags;

    bool useStaticInit;     /// if this is true, use the StructDeclaration's init symbol
    bool isOriginal = false; /// used when moving instances to indicate `this is this.origin`
    OwnedBy ownedByCtfe = OwnedBy.code;

    extern (D) this(const ref Loc loc, StructDeclaration sd, Expressions* elements, Type stype = null) @safe
    {
        super(loc, EXP.structLiteral);
        this.sd = sd;
        if (!elements)
            elements = new Expressions();
        this.elements = elements;
        this.stype = stype;
        this.origin = this;
        //printf("StructLiteralExp::StructLiteralExp(%s)\n", toChars());
    }

    static StructLiteralExp create(const ref Loc loc, StructDeclaration sd, void* elements, Type stype = null)
    {
        return new StructLiteralExp(loc, sd, cast(Expressions*)elements, stype);
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        auto e = o.isExpression();
        if (!e)
            return false;
        if (auto se = e.isStructLiteralExp())
        {
            if (!type.equals(se.type))
                return false;
            if (elements.length != se.elements.length)
                return false;
            foreach (i, e1; *elements)
            {
                auto e2 = (*se.elements)[i];
                if (e1 != e2 && (!e1 || !e2 || !e1.equals(e2)))
                    return false;
            }
            return true;
        }
        return false;
    }

    override StructLiteralExp syntaxCopy()
    {
        auto exp = new StructLiteralExp(loc, sd, arraySyntaxCopy(elements), type ? type : stype);
        exp.origin = this;
        return exp;
    }

    /**************************************
     * Gets expression at offset of type.
     * Returns NULL if not found.
     */
    Expression getField(Type type, uint offset)
    {
        //printf("StructLiteralExp::getField(this = %s, type = %s, offset = %u)\n",
        //  /*toChars()*/"", type.toChars(), offset);
        Expression e = null;
        int i = getFieldIndex(type, offset);

        if (i != -1)
        {
            //printf("\ti = %d\n", i);
            if (i >= sd.nonHiddenFields())
                return null;

            assert(i < elements.length);
            e = (*elements)[i];
            if (e)
            {
                //printf("e = %s, e.type = %s\n", e.toChars(), e.type.toChars());

                /* If type is a static array, and e is an initializer for that array,
                 * then the field initializer should be an array literal of e.
                 */
                auto tsa = type.isTypeSArray();
                if (tsa && e.type.castMod(0) != type.castMod(0))
                {
                    const length = cast(size_t)tsa.dim.toInteger();
                    auto z = new Expressions(length);
                    foreach (ref q; *z)
                        q = e.copy();
                    e = new ArrayLiteralExp(loc, type, z);
                }
                else
                {
                    e = e.copy();
                    e.type = type;
                }
                if (useStaticInit && e.type.needsNested())
                    if (auto se = e.isStructLiteralExp())
                    {
                        se.useStaticInit = true;
                    }
            }
        }
        return e;
    }

    /************************************
     * Get index of field.
     * Returns -1 if not found.
     */
    int getFieldIndex(Type type, uint offset)
    {
        /* Find which field offset is by looking at the field offsets
         */
        if (elements.length)
        {
            const sz = type.size();
            if (sz == SIZE_INVALID)
                return -1;
            foreach (i, v; sd.fields)
            {
                if (offset == v.offset && sz == v.type.size())
                {
                    /* context fields might not be filled. */
                    if (i >= sd.nonHiddenFields())
                        return cast(int)i;
                    if (auto e = (*elements)[i])
                    {
                        return cast(int)i;
                    }
                    break;
                }
            }
        }
        return -1;
    }

    override Expression addDtorHook(Scope* sc)
    {
        /* If struct requires a destructor, rewrite as:
         *    (S tmp = S()),tmp
         * so that the destructor can be hung on tmp.
         */
        if (sd.dtor && sc.func)
        {
            /* Make an identifier for the temporary of the form:
             *   __sl%s%d, where %s is the struct name
             */
            char[10] buf = void;
            const prefix = "__sl";
            const ident = sd.ident.toString;
            const fullLen = prefix.length + ident.length;
            const len = fullLen < buf.length ? fullLen : buf.length;
            buf[0 .. prefix.length] = prefix;
            buf[prefix.length .. len] = ident[0 .. len - prefix.length];

            auto tmp = copyToTemp(0, buf[0 .. len], this);
            Expression ae = new DeclarationExp(loc, tmp);
            Expression e = new CommaExp(loc, ae, new VarExp(loc, tmp));
            e = e.expressionSemantic(sc);
            return e;
        }
        return this;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        if (sc.flags & SCOPE.Cfile)
            return this;  // C struct literals are lvalues
        else
            return Expression.toLvalue(sc, e);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * C11 6.5.2.5
 * ( type-name ) { initializer-list }
 */
extern (C++) final class CompoundLiteralExp : Expression
{
    Initializer initializer; /// initializer-list

    extern (D) this(const ref Loc loc, Type type_name, Initializer initializer) @safe
    {
        super(loc, EXP.compoundLiteral);
        super.type = type_name;
        this.initializer = initializer;
        //printf("CompoundLiteralExp::CompoundLiteralExp(%s)\n", toChars());
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Mainly just a placeholder
 */
extern (C++) final class TypeExp : Expression
{
    bool parens;    // if this is a parenthesized expression

    extern (D) this(const ref Loc loc, Type type) @safe
    {
        super(loc, EXP.type);
        //printf("TypeExp::TypeExp(%s)\n", type.toChars());
        this.type = type;
    }

    override TypeExp syntaxCopy()
    {
        return new TypeExp(loc, type.syntaxCopy());
    }

    override bool checkType()
    {
        error(loc, "type `%s` is not an expression", toChars());
        return true;
    }

    override bool checkValue()
    {
        error(loc, "type `%s` has no value", toChars());
        return true;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Mainly just a placeholder of
 *  Package, Module, Nspace, and TemplateInstance (including TemplateMixin)
 *
 * A template instance that requires IFTI:
 *      foo!tiargs(fargs)       // foo!tiargs
 * is left until CallExp::semantic() or resolveProperties()
 */
extern (C++) final class ScopeExp : Expression
{
    ScopeDsymbol sds;

    extern (D) this(const ref Loc loc, ScopeDsymbol sds) @safe
    {
        super(loc, EXP.scope_);
        //printf("ScopeExp::ScopeExp(sds = '%s')\n", sds.toChars());
        //static int count; if (++count == 38) *(char*)0=0;
        this.sds = sds;
        assert(!sds.isTemplateDeclaration());   // instead, you should use TemplateExp
    }

    override ScopeExp syntaxCopy()
    {
        return new ScopeExp(loc, sds.syntaxCopy(null));
    }

    override bool checkType()
    {
        if (sds.isPackage())
        {
            error(loc, "%s `%s` has no type", sds.kind(), sds.toChars());
            return true;
        }
        if (auto ti = sds.isTemplateInstance())
        {
            //assert(ti.needsTypeInference(sc));
            if (ti.tempdecl &&
                ti.semantictiargsdone &&
                ti.semanticRun == PASS.initial)
            {
                error(loc, "partial %s `%s` has no type", sds.kind(), toChars());
                return true;
            }
        }
        return false;
    }

    override bool checkValue()
    {
        error(loc, "%s `%s` has no value", sds.kind(), sds.toChars());
        return true;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Mainly just a placeholder
 */
extern (C++) final class TemplateExp : Expression
{
    TemplateDeclaration td;
    FuncDeclaration fd;

    extern (D) this(const ref Loc loc, TemplateDeclaration td, FuncDeclaration fd = null) @safe
    {
        super(loc, EXP.template_);
        //printf("TemplateExp(): %s\n", td.toChars());
        this.td = td;
        this.fd = fd;
    }

    override bool isLvalue()
    {
        return fd !is null;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        if (!fd)
            return Expression.toLvalue(sc, e);

        assert(sc);
        return symbolToExp(fd, loc, sc, true);
    }

    override bool checkType()
    {
        error(loc, "%s `%s` has no type", td.kind(), toChars());
        return true;
    }

    override bool checkValue()
    {
        error(loc, "%s `%s` has no value", td.kind(), toChars());
        return true;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * newtype(arguments)
 */
extern (C++) final class NewExp : Expression
{
    Expression thisexp;         // if !=null, 'this' for class being allocated
    Type newtype;
    Expressions* arguments;     // Array of Expression's
    Identifiers* names;         // Array of names corresponding to expressions

    Expression argprefix;       // expression to be evaluated just before arguments[]
    CtorDeclaration member;     // constructor function
    bool onstack;               // allocate on stack
    bool thrownew;              // this NewExp is the expression of a ThrowStatement

    Expression lowering;        // lowered druntime hook: `_d_new{class,itemT}`

    /// Puts the `arguments` and `names` into an `ArgumentList` for easily passing them around.
    /// The fields are still separate for backwards compatibility
    extern (D) ArgumentList argumentList() { return ArgumentList(arguments, names); }

    extern (D) this(const ref Loc loc, Expression thisexp, Type newtype, Expressions* arguments, Identifiers* names = null) @safe
    {
        super(loc, EXP.new_);
        this.thisexp = thisexp;
        this.newtype = newtype;
        this.arguments = arguments;
        this.names = names;
    }

    static NewExp create(const ref Loc loc, Expression thisexp, Type newtype, Expressions* arguments) @safe
    {
        return new NewExp(loc, thisexp, newtype, arguments);
    }

    override NewExp syntaxCopy()
    {
        return new NewExp(loc,
            thisexp ? thisexp.syntaxCopy() : null,
            newtype.syntaxCopy(),
            arraySyntaxCopy(arguments),
            names ? names.copy() : null);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * class baseclasses { } (arguments)
 */
extern (C++) final class NewAnonClassExp : Expression
{
    Expression thisexp;     // if !=null, 'this' for class being allocated
    ClassDeclaration cd;    // class being instantiated
    Expressions* arguments; // Array of Expression's to call class constructor

    extern (D) this(const ref Loc loc, Expression thisexp, ClassDeclaration cd, Expressions* arguments) @safe
    {
        super(loc, EXP.newAnonymousClass);
        this.thisexp = thisexp;
        this.cd = cd;
        this.arguments = arguments;
    }

    override NewAnonClassExp syntaxCopy()
    {
        return new NewAnonClassExp(loc, thisexp ? thisexp.syntaxCopy() : null, cd.syntaxCopy(null), arraySyntaxCopy(arguments));
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 */
extern (C++) class SymbolExp : Expression
{
    Declaration var;
    Dsymbol originalScope; // original scope before inlining
    bool hasOverloads;

    extern (D) this(const ref Loc loc, EXP op, Declaration var, bool hasOverloads) @safe
    {
        super(loc, op);
        assert(var);
        this.var = var;
        this.hasOverloads = hasOverloads;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Offset from symbol
 */
extern (C++) final class SymOffExp : SymbolExp
{
    dinteger_t offset;

    extern (D) this(const ref Loc loc, Declaration var, dinteger_t offset, bool hasOverloads = true)
    {
        if (auto v = var.isVarDeclaration())
        {
            // FIXME: This error report will never be handled anyone.
            // It should be done before the SymOffExp construction.
            if (v.needThis())
            {
                auto t = v.isThis();
                assert(t);
                .error(loc, "taking the address of non-static variable `%s` requires an instance of `%s`", v.toChars(), t.toChars());
            }
            hasOverloads = false;
        }
        super(loc, EXP.symbolOffset, var, hasOverloads);
        this.offset = offset;
    }

    override Optional!bool toBool()
    {
        return typeof(return)(true);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Variable
 */
extern (C++) final class VarExp : SymbolExp
{
    bool delegateWasExtracted;
    extern (D) this(const ref Loc loc, Declaration var, bool hasOverloads = true) @safe
    {
        if (var.isVarDeclaration())
            hasOverloads = false;

        super(loc, EXP.variable, var, hasOverloads);
        //printf("VarExp(this = %p, '%s', loc = %s)\n", this, var.toChars(), loc.toChars());
        //if (strcmp(var.ident.toChars(), "func") == 0) assert(0);
        this.type = var.type;
    }

    static VarExp create(const ref Loc loc, Declaration var, bool hasOverloads = true) @safe
    {
        return new VarExp(loc, var, hasOverloads);
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        if (auto ne = o.isExpression().isVarExp())
        {
            if (type.toHeadMutable().equals(ne.type.toHeadMutable()) && var == ne.var)
            {
                return true;
            }
        }
        return false;
    }

    override bool isLvalue()
    {
        if (var.storage_class & (STC.lazy_ | STC.rvalue | STC.manifest))
            return false;
        return true;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        if (var.storage_class & STC.manifest)
        {
            error(loc, "manifest constant `%s` cannot be modified", var.toChars());
            return ErrorExp.get();
        }
        if (var.storage_class & STC.lazy_ && !delegateWasExtracted)
        {
            error(loc, "lazy variable `%s` cannot be modified", var.toChars());
            return ErrorExp.get();
        }
        if (var.ident == Id.ctfe)
        {
            error(loc, "cannot modify compiler-generated variable `__ctfe`");
            return ErrorExp.get();
        }
        if (var.ident == Id.dollar) // https://issues.dlang.org/show_bug.cgi?id=13574
        {
            error(loc, "cannot modify operator `$`");
            return ErrorExp.get();
        }
        return this;
    }

    override Expression modifiableLvalue(Scope* sc, Expression e)
    {
        //printf("VarExp::modifiableLvalue('%s')\n", var.toChars());
        if (var.storage_class & STC.manifest)
        {
            error(loc, "cannot modify manifest constant `%s`", toChars());
            return ErrorExp.get();
        }
        // See if this expression is a modifiable lvalue (i.e. not const)
        return Expression.modifiableLvalue(sc, e);
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Overload Set
 */
extern (C++) final class OverExp : Expression
{
    OverloadSet vars;

    extern (D) this(const ref Loc loc, OverloadSet s)
    {
        super(loc, EXP.overloadSet);
        //printf("OverExp(this = %p, '%s')\n", this, var.toChars());
        vars = s;
        type = Type.tvoid;
    }

    override bool isLvalue()
    {
        return true;
    }

    override Expression toLvalue(Scope* sc, Expression e)
    {
        return this;
    }

    override void accept(Visitor v)
    {
        v.visit(this);
    }
}

/***********************************************************
 * Function/Delegate literal
 */

extern (C++) final class FuncExp : Expression
{
    FuncLiteralDeclaration fd;
    TemplateDeclaration td;
    TOK tok;  // TOK.reserved, TOK.delegate_, TOK.function_

    extern (D) this(const ref Loc loc, Dsymbol s)
    {
        super(loc, EXP.function_);
        this.td = s.isTemplateDeclaration();
        this.fd = s.isFuncLiteralDeclaration();
        if (td)
        {
            assert(td.literal);
            assert(td.members && td.members.length == 1);
            fd = (*td.members)[0].isFuncLiteralDeclaration();
        }
        tok = fd.tok; // save original kind of function/delegate/(infer)
        assert(fd.fbody);
    }

    override bool equals(const RootObject o) const
    {
        if (this == o)
            return true;
        auto e = o.isExpression();
        if (!e)
            return false;
        if (auto fe = e.isFuncExp())
        {
            return fd == fe.fd;
        }
        return false;
    }

    extern (D) void genIdent(Scope* sc)
    {
        if (fd.ident == Id.empty)
        {
            const(char)[] s;
            if (fd.fes)
                s = "__foreachbody";
            else if (fd.tok == TOK.reserved)
                s = "__lambda";
            else if (fd.tok == TOK.delegate_)
                s = "__dgliteral";
            else
                s = "__funcliteral";

            DsymbolTable symtab;
            if (FuncDeclaration func = sc.parent.isFuncDeclaration())
            {
                if (func.localsymtab is null)
                {
                    // Inside template constraint, symtab is not set yet.
                    // Initialize it lazily.
                    func.localsymtab = new DsymbolTable();
                }
                symtab = func.localsymtab;
            }
            else
            {
                ScopeDsymbol sds = sc.parent.isScopeDsymbol();
                if (!sds.symtab)
                {
                    // Inside template constraint, symtab may not be set yet.
                    // Initialize it lazily.
                    assert(sds.isTemplateInstance());
                    sds.symtab = new DsymbolTable();
                }
                symtab = sds.symtab;
            }
            assert(symtab);
            Identifier id = Identifier.generateId(s, symtab.length() + 1);
            fd.ident = id;
            if (td)
                td.ident = id;
            symtab.insert(td ? cast(Dsymbol)td : cast(Dsymbol)fd);
        }
    }

    override FuncExp syntaxCopy()
    {
        if (td)
            return new FuncExp(loc, td.syntaxCopy(null));
        else if (fd.semanticRun == PASS.initial)
            return new FuncExp(loc, fd.syntaxCopy(null));
        else // https://issues.dlang.org/show_bug.cgi?id=13481
             // Prevent multiple semantic analysis of lambda body.
            return new FuncExp(loc, fd);
    }

    extern (D) MATCH matchType(Type to, Scope* sc, FuncExp* presult, ErrorSink eSink)
    {
        MATCH cannotInfer()
        {
            eSink.error(loc, "cannot infer parameter types from `%s`", to.toChars());
            return MATCH.nomatch;
        }

        //printf("FuncExp::matchType('%s'), to=%s\n", type ? type.toChars() : "null", to.toChars());
        if (presult)
            *presult = null;

        TypeFunction tof = null;
        if (to.ty == Tdelegate)
        {
            if (tok == TOK.function_)
            {
                eSink.error(loc, "cannot match function literal to delegate type `%s`", to.toChars());
                return MATCH.nomatch;
            }
            tof = cast(TypeFunction)to.nextOf();
        }
        else if (to.ty == Tpointer && (tof = to.nextOf().isTypeFunction()) !is null)
        {
            if (tok == TOK.delegate_)
            {
                eSink.error(loc, "cannot match delegate literal to function pointer type `%s`", to.toChars());
                return MATCH.nomatch;
            }
        }

        if (td)
        {
            if (!tof)
            {
                return cannotInfer();
            }

            // Parameter types inference from 'tof'
            assert(td._scope);
            TypeFunction tf = fd.type.isTypeFunction();
            //printf("\ttof = %s\n", tof.toChars());
            //printf("\ttf  = %s\n", tf.toChars());
            const dim = tf.parameterList.length;

            if (tof.parameterList.length != dim || tof.parameterList.varargs != tf.parameterList.varargs)
                return cannotInfer();

            auto tiargs = new Objects();
            tiargs.reserve(td.parameters.length);

            foreach (tp; *td.parameters)
            {
                size_t u = 0;
                foreach (i, p; tf.parameterList)
                {
                    if (auto ti = p.type.isTypeIdentifier())
                        if (ti && ti.ident == tp.ident)
                            break;

                    ++u;
                }
                assert(u < dim);
                Parameter pto = tof.parameterList[u];
                Type t = pto.type;
                if (t.ty == Terror)
                    return cannotInfer();
                tf.parameterList[u].storageClass = tof.parameterList[u].storageClass;
                tiargs.push(t);
            }

            // Set target of return type inference
            if (!tf.next && tof.next)
                fd.treq = to;

            auto ti = new TemplateInstance(loc, td, tiargs);
            Expression ex = (new ScopeExp(loc, ti)).expressionSemantic(td._scope);

            // Reset inference target for the later re-semantic
            fd.treq = null;

            if (ex.op == EXP.error)
                return MATCH.nomatch;
            if (auto ef = ex.isFuncExp())
                return ef.matchType(to, sc, presult, eSink);
            else
                return cannotInfer();
        }

        if (!tof || !tof.next)
            return MATCH.nomatch;

        assert(type && type != Type.tvoid);
        if (fd.type.ty == Terror)
            return MATCH.nomatch;
        auto tfx = fd.type.isTypeFunction();
        bool convertMatch = (type.ty != to.ty);

        if (fd.inferRetType && tfx.next.implicitConvTo(tof.next) == MATCH.convert)
        {
            /* If return type is inferred and covariant return,
             * tweak return statements to required return type.
             *
             * interface I {}
             * class C : Object, I{}
             *
             * I delegate() dg = delegate() { return new class C(); }
             */
            convertMatch = true;

            auto tfy = new TypeFunction(tfx.parameterList, tof.next,
                        tfx.linkage, STC.undefined_);
            tfy.mod = tfx.mod;
            tfy.trust = tfx.trust;
            tfy.isnothrow = tfx.isnothrow;
            tfy.isnogc = tfx.isnogc;