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expressionsem.d
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expressionsem.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/expressionsem.d, _expressionsem.d)
* Documentation: https://dlang.org/phobos/dmd_expressionsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/expressionsem.d
*/
module dmd.expressionsem;
import core.stdc.stdio;
import core.stdc.string;
import dmd.access;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.attrib;
import dmd.astcodegen;
import dmd.canthrow;
import dmd.ctorflow;
import dmd.dscope;
import dmd.dsymbol;
import dmd.declaration;
import dmd.dclass;
import dmd.dcast;
import dmd.delegatize;
import dmd.denum;
import dmd.dimport;
import dmd.dmangle;
import dmd.dmodule;
import dmd.dstruct;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.escape;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.imphint;
import dmd.inline;
import dmd.intrange;
import dmd.mtype;
import dmd.nspace;
import dmd.opover;
import dmd.optimize;
import dmd.parse;
import dmd.root.ctfloat;
import dmd.root.file;
import dmd.root.filename;
import dmd.root.outbuffer;
import dmd.root.rootobject;
import dmd.semantic2;
import dmd.semantic3;
import dmd.sideeffect;
import dmd.safe;
import dmd.target;
import dmd.tokens;
import dmd.traits;
import dmd.typesem;
import dmd.typinf;
import dmd.utf;
import dmd.utils;
import dmd.visitor;
enum LOGSEMANTIC = false;
/***************************************
* Pull out any properties.
*/
private Expression resolvePropertiesX(Scope* sc, Expression e1, Expression e2 = null)
{
//printf("resolvePropertiesX, e1 = %s %s, e2 = %s\n", Token.toChars(e1.op), e1.toChars(), e2 ? e2.toChars() : null);
Loc loc = e1.loc;
OverloadSet os;
Dsymbol s;
Objects* tiargs;
Type tthis;
if (e1.op == TOK.dot)
{
DotExp de = cast(DotExp)e1;
if (de.e2.op == TOK.overloadSet)
{
tiargs = null;
tthis = de.e1.type;
os = (cast(OverExp)de.e2).vars;
goto Los;
}
}
else if (e1.op == TOK.overloadSet)
{
tiargs = null;
tthis = null;
os = (cast(OverExp)e1).vars;
Los:
assert(os);
FuncDeclaration fd = null;
if (e2)
{
e2 = e2.expressionSemantic(sc);
if (e2.op == TOK.error)
return new ErrorExp();
e2 = resolveProperties(sc, e2);
Expressions a;
a.push(e2);
for (size_t i = 0; i < os.a.dim; i++)
{
FuncDeclaration f = resolveFuncCall(loc, sc, os.a[i], tiargs, tthis, &a, 1);
if (f)
{
if (f.errors)
return new ErrorExp();
fd = f;
assert(fd.type.ty == Tfunction);
}
}
if (fd)
{
Expression e = new CallExp(loc, e1, e2);
return e.expressionSemantic(sc);
}
}
{
for (size_t i = 0; i < os.a.dim; i++)
{
FuncDeclaration f = resolveFuncCall(loc, sc, os.a[i], tiargs, tthis, null, 1);
if (f)
{
if (f.errors)
return new ErrorExp();
fd = f;
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
if (!tf.isref && e2)
goto Leproplvalue;
}
}
if (fd)
{
Expression e = new CallExp(loc, e1);
if (e2)
e = new AssignExp(loc, e, e2);
return e.expressionSemantic(sc);
}
}
if (e2)
goto Leprop;
}
else if (e1.op == TOK.dotTemplateInstance)
{
DotTemplateInstanceExp dti = cast(DotTemplateInstanceExp)e1;
if (!dti.findTempDecl(sc))
goto Leprop;
if (!dti.ti.semanticTiargs(sc))
goto Leprop;
tiargs = dti.ti.tiargs;
tthis = dti.e1.type;
if ((os = dti.ti.tempdecl.isOverloadSet()) !is null)
goto Los;
if ((s = dti.ti.tempdecl) !is null)
goto Lfd;
}
else if (e1.op == TOK.dotTemplateDeclaration)
{
DotTemplateExp dte = cast(DotTemplateExp)e1;
s = dte.td;
tiargs = null;
tthis = dte.e1.type;
goto Lfd;
}
else if (e1.op == TOK.scope_)
{
s = (cast(ScopeExp)e1).sds;
TemplateInstance ti = s.isTemplateInstance();
if (ti && !ti.semanticRun && ti.tempdecl)
{
//assert(ti.needsTypeInference(sc));
if (!ti.semanticTiargs(sc))
goto Leprop;
tiargs = ti.tiargs;
tthis = null;
if ((os = ti.tempdecl.isOverloadSet()) !is null)
goto Los;
if ((s = ti.tempdecl) !is null)
goto Lfd;
}
}
else if (e1.op == TOK.template_)
{
s = (cast(TemplateExp)e1).td;
tiargs = null;
tthis = null;
goto Lfd;
}
else if (e1.op == TOK.dotVariable && e1.type && e1.type.toBasetype().ty == Tfunction)
{
DotVarExp dve = cast(DotVarExp)e1;
s = dve.var.isFuncDeclaration();
tiargs = null;
tthis = dve.e1.type;
goto Lfd;
}
else if (e1.op == TOK.variable && e1.type && e1.type.toBasetype().ty == Tfunction)
{
s = (cast(VarExp)e1).var.isFuncDeclaration();
tiargs = null;
tthis = null;
Lfd:
assert(s);
if (e2)
{
e2 = e2.expressionSemantic(sc);
if (e2.op == TOK.error)
return new ErrorExp();
e2 = resolveProperties(sc, e2);
Expressions a;
a.push(e2);
FuncDeclaration fd = resolveFuncCall(loc, sc, s, tiargs, tthis, &a, 1);
if (fd && fd.type)
{
if (fd.errors)
return new ErrorExp();
assert(fd.type.ty == Tfunction);
Expression e = new CallExp(loc, e1, e2);
return e.expressionSemantic(sc);
}
}
{
FuncDeclaration fd = resolveFuncCall(loc, sc, s, tiargs, tthis, null, 1);
if (fd && fd.type)
{
if (fd.errors)
return new ErrorExp();
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
if (!e2 || tf.isref)
{
Expression e = new CallExp(loc, e1);
if (e2)
e = new AssignExp(loc, e, e2);
return e.expressionSemantic(sc);
}
}
}
if (FuncDeclaration fd = s.isFuncDeclaration())
{
// Keep better diagnostic message for invalid property usage of functions
assert(fd.type.ty == Tfunction);
Expression e = new CallExp(loc, e1, e2);
return e.expressionSemantic(sc);
}
if (e2)
goto Leprop;
}
if (e1.op == TOK.variable)
{
VarExp ve = cast(VarExp)e1;
VarDeclaration v = ve.var.isVarDeclaration();
if (v && ve.checkPurity(sc, v))
return new ErrorExp();
}
if (e2)
return null;
if (e1.type && e1.op != TOK.type) // function type is not a property
{
/* Look for e1 being a lazy parameter; rewrite as delegate call
*/
if (e1.op == TOK.variable)
{
VarExp ve = cast(VarExp)e1;
if (ve.var.storage_class & STC.lazy_)
{
Expression e = new CallExp(loc, e1);
return e.expressionSemantic(sc);
}
}
else if (e1.op == TOK.dotVariable)
{
// Check for reading overlapped pointer field in @safe code.
if (checkUnsafeAccess(sc, e1, true, true))
return new ErrorExp();
}
else if (e1.op == TOK.dot)
{
e1.error("expression has no value");
return new ErrorExp();
}
else if (e1.op == TOK.call)
{
CallExp ce = cast(CallExp)e1;
// Check for reading overlapped pointer field in @safe code.
if (checkUnsafeAccess(sc, ce.e1, true, true))
return new ErrorExp();
}
}
if (!e1.type)
{
error(loc, "cannot resolve type for %s", e1.toChars());
e1 = new ErrorExp();
}
return e1;
Leprop:
error(loc, "not a property %s", e1.toChars());
return new ErrorExp();
Leproplvalue:
error(loc, "%s is not an lvalue", e1.toChars());
return new ErrorExp();
}
extern (C++) Expression resolveProperties(Scope* sc, Expression e)
{
//printf("resolveProperties(%s)\n", e.toChars());
e = resolvePropertiesX(sc, e);
if (e.checkRightThis(sc))
return new ErrorExp();
return e;
}
/****************************************
* The common type is determined by applying ?: to each pair.
* Output:
* exps[] properties resolved, implicitly cast to common type, rewritten in place
* *pt if pt is not NULL, set to the common type
* Returns:
* true a semantic error was detected
*/
private bool arrayExpressionToCommonType(Scope* sc, Expressions* exps, Type* pt)
{
/* Still have a problem with:
* ubyte[][] = [ cast(ubyte[])"hello", [1]];
* which works if the array literal is initialized top down with the ubyte[][]
* type, but fails with this function doing bottom up typing.
*/
//printf("arrayExpressionToCommonType()\n");
scope IntegerExp integerexp = new IntegerExp(0);
scope CondExp condexp = new CondExp(Loc.initial, integerexp, null, null);
Type t0 = null;
Expression e0 = null;
size_t j0 = ~0;
for (size_t i = 0; i < exps.dim; i++)
{
Expression e = (*exps)[i];
if (!e)
continue;
e = resolveProperties(sc, e);
if (!e.type)
{
e.error("`%s` has no value", e.toChars());
t0 = Type.terror;
continue;
}
if (e.op == TOK.type)
{
e.checkValue(); // report an error "type T has no value"
t0 = Type.terror;
continue;
}
if (e.type.ty == Tvoid)
{
// void expressions do not concur to the determination of the common
// type.
continue;
}
if (checkNonAssignmentArrayOp(e))
{
t0 = Type.terror;
continue;
}
e = doCopyOrMove(sc, e);
if (t0 && !t0.equals(e.type))
{
/* This applies ?: to merge the types. It's backwards;
* ?: should call this function to merge types.
*/
condexp.type = null;
condexp.e1 = e0;
condexp.e2 = e;
condexp.loc = e.loc;
Expression ex = condexp.expressionSemantic(sc);
if (ex.op == TOK.error)
e = ex;
else
{
(*exps)[j0] = condexp.e1;
e = condexp.e2;
}
}
j0 = i;
e0 = e;
t0 = e.type;
if (e.op != TOK.error)
(*exps)[i] = e;
}
if (!t0)
t0 = Type.tvoid; // [] is typed as void[]
else if (t0.ty != Terror)
{
for (size_t i = 0; i < exps.dim; i++)
{
Expression e = (*exps)[i];
if (!e)
continue;
e = e.implicitCastTo(sc, t0);
//assert(e.op != TOK.error);
if (e.op == TOK.error)
{
/* https://issues.dlang.org/show_bug.cgi?id=13024
* a workaround for the bug in typeMerge -
* it should paint e1 and e2 by deduced common type,
* but doesn't in this particular case.
*/
t0 = Type.terror;
break;
}
(*exps)[i] = e;
}
}
if (pt)
*pt = t0;
return (t0 == Type.terror);
}
/****************************************
* Preprocess arguments to function.
* Output:
* exps[] tuples expanded, properties resolved, rewritten in place
* Returns:
* true a semantic error occurred
*/
private bool preFunctionParameters(Scope* sc, Expressions* exps)
{
bool err = false;
if (exps)
{
expandTuples(exps);
for (size_t i = 0; i < exps.dim; i++)
{
Expression arg = (*exps)[i];
arg = resolveProperties(sc, arg);
if (arg.op == TOK.type)
{
arg.error("cannot pass type `%s` as a function argument", arg.toChars());
arg = new ErrorExp();
err = true;
}
else if (checkNonAssignmentArrayOp(arg))
{
arg = new ErrorExp();
err = true;
}
(*exps)[i] = arg;
}
}
return err;
}
/********************************************
* Issue an error if default construction is disabled for type t.
* Default construction is required for arrays and 'out' parameters.
* Returns:
* true an error was issued
*/
private bool checkDefCtor(Loc loc, Type t)
{
t = t.baseElemOf();
if (t.ty == Tstruct)
{
StructDeclaration sd = (cast(TypeStruct)t).sym;
if (sd.noDefaultCtor)
{
sd.error(loc, "default construction is disabled");
return true;
}
}
return false;
}
/****************************************
* Now that we know the exact type of the function we're calling,
* the arguments[] need to be adjusted:
* 1. implicitly convert argument to the corresponding parameter type
* 2. add default arguments for any missing arguments
* 3. do default promotions on arguments corresponding to ...
* 4. add hidden _arguments[] argument
* 5. call copy constructor for struct value arguments
* Input:
* tf type of the function
* fd the function being called, NULL if called indirectly
* Output:
* *prettype return type of function
* *peprefix expression to execute before arguments[] are evaluated, NULL if none
* Returns:
* true errors happened
*/
private bool functionParameters(Loc loc, Scope* sc, TypeFunction tf, Type tthis, Expressions* arguments, FuncDeclaration fd, Type* prettype, Expression* peprefix)
{
//printf("functionParameters() %s\n", fd ? fd.toChars() : "");
assert(arguments);
assert(fd || tf.next);
size_t nargs = arguments ? arguments.dim : 0;
size_t nparams = Parameter.dim(tf.parameters);
uint olderrors = global.errors;
bool err = false;
*prettype = Type.terror;
Expression eprefix = null;
*peprefix = null;
if (nargs > nparams && tf.varargs == 0)
{
error(loc, "expected %llu arguments, not %llu for non-variadic function type `%s`", cast(ulong)nparams, cast(ulong)nargs, tf.toChars());
return true;
}
// If inferring return type, and semantic3() needs to be run if not already run
if (!tf.next && fd.inferRetType)
{
fd.functionSemantic();
}
else if (fd && fd.parent)
{
TemplateInstance ti = fd.parent.isTemplateInstance();
if (ti && ti.tempdecl)
{
fd.functionSemantic3();
}
}
bool isCtorCall = fd && fd.needThis() && fd.isCtorDeclaration();
size_t n = (nargs > nparams) ? nargs : nparams; // n = max(nargs, nparams)
/* If the function return type has wildcards in it, we'll need to figure out the actual type
* based on the actual argument types.
*/
MOD wildmatch = 0;
if (tthis && tf.isWild() && !isCtorCall)
{
Type t = tthis;
if (t.isImmutable())
wildmatch = MODFlags.immutable_;
else if (t.isWildConst())
wildmatch = MODFlags.wildconst;
else if (t.isWild())
wildmatch = MODFlags.wild;
else if (t.isConst())
wildmatch = MODFlags.const_;
else
wildmatch = MODFlags.mutable;
}
int done = 0;
for (size_t i = 0; i < n; i++)
{
Expression arg;
if (i < nargs)
arg = (*arguments)[i];
else
arg = null;
if (i < nparams)
{
Parameter p = Parameter.getNth(tf.parameters, i);
if (!arg)
{
if (!p.defaultArg)
{
if (tf.varargs == 2 && i + 1 == nparams)
goto L2;
error(loc, "expected %llu function arguments, not %llu", cast(ulong)nparams, cast(ulong)nargs);
return true;
}
arg = p.defaultArg;
arg = inlineCopy(arg, sc);
// __FILE__, __LINE__, __MODULE__, __FUNCTION__, and __PRETTY_FUNCTION__
arg = arg.resolveLoc(loc, sc);
arguments.push(arg);
nargs++;
}
else
{
if (arg.op == TOK.default_)
{
arg = arg.resolveLoc(loc, sc);
(*arguments)[i] = arg;
}
}
if (tf.varargs == 2 && i + 1 == nparams) // https://dlang.org/spec/function.html#variadic
{
//printf("\t\tvarargs == 2, p.type = '%s'\n", p.type.toChars());
{
MATCH m;
if ((m = arg.implicitConvTo(p.type)) > MATCH.nomatch)
{
if (p.type.nextOf() && arg.implicitConvTo(p.type.nextOf()) >= m)
goto L2;
else if (nargs != nparams)
{
error(loc, "expected %llu function arguments, not %llu", cast(ulong)nparams, cast(ulong)nargs);
return true;
}
goto L1;
}
}
L2:
Type tb = p.type.toBasetype();
Type tret = p.isLazyArray();
switch (tb.ty)
{
case Tsarray:
case Tarray:
{
/* Create a static array variable v of type arg.type:
* T[dim] __arrayArg = [ arguments[i], ..., arguments[nargs-1] ];
*
* The array literal in the initializer of the hidden variable
* is now optimized.
* https://issues.dlang.org/show_bug.cgi?id=2356
*/
Type tbn = (cast(TypeArray)tb).next;
Type tsa = tbn.sarrayOf(nargs - i);
auto elements = new Expressions();
elements.setDim(nargs - i);
for (size_t u = 0; u < elements.dim; u++)
{
Expression a = (*arguments)[i + u];
if (tret && a.implicitConvTo(tret))
{
a = a.implicitCastTo(sc, tret);
a = a.optimize(WANTvalue);
a = toDelegate(a, a.type, sc);
}
else
a = a.implicitCastTo(sc, tbn);
(*elements)[u] = a;
}
// https://issues.dlang.org/show_bug.cgi?id=14395
// Convert to a static array literal, or its slice.
arg = new ArrayLiteralExp(loc, elements);
arg.type = tsa;
if (tb.ty == Tarray)
{
arg = new SliceExp(loc, arg, null, null);
arg.type = p.type;
}
break;
}
case Tclass:
{
/* Set arg to be:
* new Tclass(arg0, arg1, ..., argn)
*/
auto args = new Expressions();
args.setDim(nargs - i);
for (size_t u = i; u < nargs; u++)
(*args)[u - i] = (*arguments)[u];
arg = new NewExp(loc, null, null, p.type, args);
break;
}
default:
if (!arg)
{
error(loc, "not enough arguments");
return true;
}
break;
}
arg = arg.expressionSemantic(sc);
//printf("\targ = '%s'\n", arg.toChars());
arguments.setDim(i + 1);
(*arguments)[i] = arg;
nargs = i + 1;
done = 1;
}
L1:
if (!(p.storageClass & STC.lazy_ && p.type.ty == Tvoid))
{
bool isRef = (p.storageClass & (STC.ref_ | STC.out_)) != 0;
if (ubyte wm = arg.type.deduceWild(p.type, isRef))
{
if (wildmatch)
wildmatch = MODmerge(wildmatch, wm);
else
wildmatch = wm;
//printf("[%d] p = %s, a = %s, wm = %d, wildmatch = %d\n", i, p.type.toChars(), arg.type.toChars(), wm, wildmatch);
}
}
}
if (done)
break;
}
if ((wildmatch == MODFlags.mutable || wildmatch == MODFlags.immutable_) && tf.next.hasWild() && (tf.isref || !tf.next.implicitConvTo(tf.next.immutableOf())))
{
if (fd)
{
/* If the called function may return the reference to
* outer inout data, it should be rejected.
*
* void foo(ref inout(int) x) {
* ref inout(int) bar(inout(int)) { return x; }
* struct S { ref inout(int) bar() inout { return x; } }
* bar(int.init) = 1; // bad!
* S().bar() = 1; // bad!
* }
*/
Dsymbol s = null;
if (fd.isThis() || fd.isNested())
s = fd.toParent2();
for (; s; s = s.toParent2())
{
if (auto ad = s.isAggregateDeclaration())
{
if (ad.isNested())
continue;
break;
}
if (auto ff = s.isFuncDeclaration())
{
if ((cast(TypeFunction)ff.type).iswild)
goto Linouterr;
if (ff.isNested() || ff.isThis())
continue;
}
break;
}
}
else if (tf.isWild())
{
Linouterr:
const(char)* s = wildmatch == MODFlags.mutable ? "mutable" : MODtoChars(wildmatch);
error(loc, "modify `inout` to `%s` is not allowed inside `inout` function", s);
return true;
}
}
assert(nargs >= nparams);
for (size_t i = 0; i < nargs; i++)
{
Expression arg = (*arguments)[i];
assert(arg);
if (i < nparams)
{
Parameter p = Parameter.getNth(tf.parameters, i);
if (!(p.storageClass & STC.lazy_ && p.type.ty == Tvoid))
{
Type tprm = p.type;
if (p.type.hasWild())
tprm = p.type.substWildTo(wildmatch);
if (!tprm.equals(arg.type))
{
//printf("arg.type = %s, p.type = %s\n", arg.type.toChars(), p.type.toChars());
arg = arg.implicitCastTo(sc, tprm);
arg = arg.optimize(WANTvalue, (p.storageClass & (STC.ref_ | STC.out_)) != 0);
}
}
if (p.storageClass & STC.ref_)
{
arg = arg.toLvalue(sc, arg);
// Look for mutable misaligned pointer, etc., in @safe mode
err |= checkUnsafeAccess(sc, arg, false, true);
}
else if (p.storageClass & STC.out_)
{
Type t = arg.type;
if (!t.isMutable() || !t.isAssignable()) // check blit assignable
{
arg.error("cannot modify struct `%s` with immutable members", arg.toChars());
err = true;
}
else
{
// Look for misaligned pointer, etc., in @safe mode
err |= checkUnsafeAccess(sc, arg, false, true);
err |= checkDefCtor(arg.loc, t); // t must be default constructible
}
arg = arg.toLvalue(sc, arg);
}
else if (p.storageClass & STC.lazy_)
{
// Convert lazy argument to a delegate
if (p.type.ty == Tvoid)
arg = toDelegate(arg, p.type, sc);
else
arg = toDelegate(arg, arg.type, sc);
}
//printf("arg: %s\n", arg.toChars());
//printf("type: %s\n", arg.type.toChars());
//printf("param: %s\n", p.toChars());
if (tf.parameterEscapes(tthis, p))
{
/* Argument value can escape from the called function.
* Check arg to see if it matters.
*/
if (global.params.vsafe)
err |= checkParamArgumentEscape(sc, fd, p.ident, arg, false);
}
else
{
/* Argument value cannot escape from the called function.
*/
Expression a = arg;
if (a.op == TOK.cast_)
a = (cast(CastExp)a).e1;
if (a.op == TOK.function_)
{
/* Function literals can only appear once, so if this
* appearance was scoped, there cannot be any others.
*/
FuncExp fe = cast(FuncExp)a;
fe.fd.tookAddressOf = 0;
}
else if (a.op == TOK.delegate_)
{
/* For passing a delegate to a scoped parameter,
* this doesn't count as taking the address of it.
* We only worry about 'escaping' references to the function.
*/
DelegateExp de = cast(DelegateExp)a;
if (de.e1.op == TOK.variable)
{
VarExp ve = cast(VarExp)de.e1;
FuncDeclaration f = ve.var.isFuncDeclaration();
if (f)
{
f.tookAddressOf--;
//printf("--tookAddressOf = %d\n", f.tookAddressOf);
}
}
}
}
arg = arg.optimize(WANTvalue, (p.storageClass & (STC.ref_ | STC.out_)) != 0);
}
else
{
// These will be the trailing ... arguments
// If not D linkage, do promotions
if (tf.linkage != LINK.d)
{
// Promote bytes, words, etc., to ints
arg = integralPromotions(arg, sc);
// Promote floats to doubles
switch (arg.type.ty)
{
case Tfloat32:
arg = arg.castTo(sc, Type.tfloat64);
break;
case Timaginary32:
arg = arg.castTo(sc, Type.timaginary64);
break;
default:
break;
}
if (tf.varargs == 1)
{
const(char)* p = tf.linkage == LINK.c ? "extern(C)" : "extern(C++)";
if (arg.type.ty == Tarray)
{
arg.error("cannot pass dynamic arrays to `%s` vararg functions", p);
err = true;
}
if (arg.type.ty == Tsarray)
{
arg.error("cannot pass static arrays to `%s` vararg functions", p);
err = true;
}
}
}
// Do not allow types that need destructors
if (arg.type.needsDestruction())
{
arg.error("cannot pass types that need destruction as variadic arguments");
err = true;
}
// Convert static arrays to dynamic arrays
// BUG: I don't think this is right for D2
Type tb = arg.type.toBasetype();
if (tb.ty == Tsarray)
{
TypeSArray ts = cast(TypeSArray)tb;
Type ta = ts.next.arrayOf();
if (ts.size(arg.loc) == 0)
arg = new NullExp(arg.loc, ta);
else
arg = arg.castTo(sc, ta);
}
if (tb.ty == Tstruct)
{
//arg = callCpCtor(sc, arg);
}
// Give error for overloaded function addresses
if (arg.op == TOK.symbolOffset)
{
SymOffExp se = cast(SymOffExp)arg;
if (se.hasOverloads && !se.var.isFuncDeclaration().isUnique())
{
arg.error("function `%s` is overloaded", arg.toChars());
err = true;
}
}
if (arg.checkValue())
err = true;
arg = arg.optimize(WANTvalue);
}
(*arguments)[i] = arg;
}
/* Remaining problems:
* 1. order of evaluation - some function push L-to-R, others R-to-L. Until we resolve what array assignment does (which is
* implemented by calling a function) we'll defer this for now.
* 2. value structs (or static arrays of them) that need to be copy constructed
* 3. value structs (or static arrays of them) that have destructors, and subsequent arguments that may throw before the
* function gets called (functions normally destroy their parameters)
* 2 and 3 are handled by doing the argument construction in 'eprefix' so that if a later argument throws, they are cleaned
* up properly. Pushing arguments on the stack then cannot fail.
*/
if (1)
{
/* TODO: tackle problem 1)
*/
const bool leftToRight = true; // TODO: something like !fd.isArrayOp
if (!leftToRight)
assert(nargs == nparams); // no variadics for RTL order, as they would probably be evaluated LTR and so add complexity
const ptrdiff_t start = (leftToRight ? 0 : cast(ptrdiff_t)nargs - 1);
const ptrdiff_t end = (leftToRight ? cast(ptrdiff_t)nargs : -1);
const ptrdiff_t step = (leftToRight ? 1 : -1);
/* Compute indices of last throwing argument and first arg needing destruction.
* Used to not set up destructors unless an arg needs destruction on a throw
* in a later argument.
*/
ptrdiff_t lastthrow = -1;
ptrdiff_t firstdtor = -1;
for (ptrdiff_t i = start; i != end; i += step)
{
Expression arg = (*arguments)[i];
if (canThrow(arg, sc.func, false))
lastthrow = i;
if (firstdtor == -1 && arg.type.needsDestruction())
{
Parameter p = (i >= nparams ? null : Parameter.getNth(tf.parameters, i));
if (!(p && (p.storageClass & (STC.lazy_ | STC.ref_ | STC.out_))))
firstdtor = i;
}
}
/* Does problem 3) apply to this call?
*/
const bool needsPrefix = (firstdtor >= 0 && lastthrow >= 0
&& (lastthrow - firstdtor) * step > 0);
/* If so, initialize 'eprefix' by declaring the gate
*/
VarDeclaration gate = null;
if (needsPrefix)
{
// eprefix => bool __gate [= false]
Identifier idtmp = Identifier.generateId("__gate");
gate = new VarDeclaration(loc, Type.tbool, idtmp, null);
gate.storage_class |= STC.temp | STC.ctfe | STC.volatile_;
gate.dsymbolSemantic(sc);