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dsymbolsem.d
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dsymbolsem.d
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/**
* Does the semantic 1 pass on the AST, which looks at symbol declarations but not initializers
* or function bodies.
*
* Copyright: Copyright (C) 1999-2022 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/dsymbolsem.d, _dsymbolsem.d)
* Documentation: https://dlang.org/phobos/dmd_dsymbolsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/dsymbolsem.d
*/
module dmd.dsymbolsem;
import core.stdc.stdio;
import core.stdc.string;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.apply;
import dmd.arraytypes;
import dmd.astcodegen;
import dmd.astenums;
import dmd.attrib;
import dmd.blockexit;
import dmd.clone;
import dmd.compiler;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dimport;
import dmd.dinterpret;
import dmd.dmangle;
import dmd.dmodule;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dtemplate;
import dmd.dversion;
import dmd.errors;
import dmd.escape;
import dmd.expression;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.id;
import dmd.identifier;
import dmd.importc;
import dmd.init;
import dmd.initsem;
import dmd.hdrgen;
import dmd.mtype;
import dmd.mustuse;
import dmd.nogc;
import dmd.nspace;
import dmd.objc;
import dmd.opover;
import dmd.parse;
import dmd.root.filename;
import dmd.common.outbuffer;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.root.utf;
import dmd.semantic2;
import dmd.semantic3;
import dmd.sideeffect;
import dmd.statementsem;
import dmd.staticassert;
import dmd.tokens;
import dmd.utils;
import dmd.statement;
import dmd.target;
import dmd.templateparamsem;
import dmd.typesem;
import dmd.visitor;
enum LOG = false;
private uint setMangleOverride(Dsymbol s, const(char)[] sym)
{
if (s.isFuncDeclaration() || s.isVarDeclaration())
{
s.isDeclaration().mangleOverride = sym;
return 1;
}
if (auto ad = s.isAttribDeclaration())
{
uint nestedCount = 0;
ad.include(null).foreachDsymbol( (s) { nestedCount += setMangleOverride(s, sym); } );
return nestedCount;
}
return 0;
}
/*************************************
* Does semantic analysis on the public face of declarations.
*/
extern(C++) void dsymbolSemantic(Dsymbol dsym, Scope* sc)
{
scope v = new DsymbolSemanticVisitor(sc);
dsym.accept(v);
}
/***************************************************
* Determine the numerical value of the AlignmentDeclaration
* Params:
* ad = AlignmentDeclaration
* sc = context
* Returns:
* ad with alignment value determined
*/
AlignDeclaration getAlignment(AlignDeclaration ad, Scope* sc)
{
if (!ad.salign.isUnknown()) // UNKNOWN is 0
return ad;
if (!ad.exps)
{
ad.salign.setDefault();
return ad;
}
dinteger_t strictest = 0; // strictest alignment
bool errors;
foreach (ref exp; (*ad.exps)[])
{
sc = sc.startCTFE();
auto e = exp.expressionSemantic(sc);
e = resolveProperties(sc, e);
sc = sc.endCTFE();
e = e.ctfeInterpret();
exp = e; // could be re-evaluated if exps are assigned to more than one AlignDeclaration by CParser.applySpecifier(),
// e.g. `_Alignas(8) int a, b;`
if (e.op == EXP.error)
errors = true;
else
{
auto n = e.toInteger();
if (sc.flags & SCOPE.Cfile && n == 0) // C11 6.7.5-6 allows 0 for alignment
continue;
if (n < 1 || n & (n - 1) || ushort.max < n || !e.type.isintegral())
{
error(ad.loc, "alignment must be an integer positive power of 2, not 0x%llx", cast(ulong)n);
errors = true;
}
if (n > strictest) // C11 6.7.5-6
strictest = n;
}
}
if (errors || strictest == 0) // C11 6.7.5-6 says alignment of 0 means no effect
ad.salign.setDefault();
else
ad.salign.set(cast(uint) strictest);
return ad;
}
const(char)* getMessage(DeprecatedDeclaration dd)
{
if (auto sc = dd._scope)
{
dd._scope = null;
sc = sc.startCTFE();
dd.msg = dd.msg.expressionSemantic(sc);
dd.msg = resolveProperties(sc, dd.msg);
sc = sc.endCTFE();
dd.msg = dd.msg.ctfeInterpret();
if (auto se = dd.msg.toStringExp())
dd.msgstr = se.toStringz().ptr;
else
dd.msg.error("compile time constant expected, not `%s`", dd.msg.toChars());
}
return dd.msgstr;
}
// Returns true if a contract can appear without a function body.
package bool allowsContractWithoutBody(FuncDeclaration funcdecl)
{
assert(!funcdecl.fbody);
/* Contracts can only appear without a body when they are virtual
* interface functions or abstract.
*/
Dsymbol parent = funcdecl.toParent();
InterfaceDeclaration id = parent.isInterfaceDeclaration();
if (!funcdecl.isAbstract() &&
(funcdecl.fensures || funcdecl.frequires) &&
!(id && funcdecl.isVirtual()))
{
auto cd = parent.isClassDeclaration();
if (!(cd && cd.isAbstract()))
return false;
}
return true;
}
private extern(C++) final class DsymbolSemanticVisitor : Visitor
{
alias visit = Visitor.visit;
Scope* sc;
this(Scope* sc)
{
this.sc = sc;
}
// Save the scope and defer semantic analysis on the Dsymbol.
private void deferDsymbolSemantic(Dsymbol s, Scope *scx)
{
s._scope = scx ? scx : sc.copy();
s._scope.setNoFree();
Module.addDeferredSemantic(s);
}
override void visit(Dsymbol dsym)
{
dsym.error("%p has no semantic routine", dsym);
}
override void visit(ScopeDsymbol) { }
override void visit(Declaration) { }
override void visit(AliasThis dsym)
{
if (dsym.semanticRun != PASS.initial)
return;
if (dsym._scope)
{
sc = dsym._scope;
dsym._scope = null;
}
if (!sc)
return;
dsym.semanticRun = PASS.semantic;
dsym.isDeprecated_ = !!(sc.stc & STC.deprecated_);
Dsymbol p = sc.parent.pastMixin();
AggregateDeclaration ad = p.isAggregateDeclaration();
if (!ad)
{
error(dsym.loc, "alias this can only be a member of aggregate, not %s `%s`", p.kind(), p.toChars());
return;
}
assert(ad.members);
Dsymbol s = ad.search(dsym.loc, dsym.ident);
if (!s)
{
s = sc.search(dsym.loc, dsym.ident, null);
if (s)
error(dsym.loc, "`%s` is not a member of `%s`", s.toChars(), ad.toChars());
else
error(dsym.loc, "undefined identifier `%s`", dsym.ident.toChars());
return;
}
if (ad.aliasthis && s != ad.aliasthis)
{
error(dsym.loc, "there can be only one alias this");
return;
}
/* disable the alias this conversion so the implicit conversion check
* doesn't use it.
*/
ad.aliasthis = null;
Dsymbol sx = s;
if (sx.isAliasDeclaration())
sx = sx.toAlias();
Declaration d = sx.isDeclaration();
if (d && !d.isTupleDeclaration())
{
/* https://issues.dlang.org/show_bug.cgi?id=18429
*
* If the identifier in the AliasThis declaration
* is defined later and is a voldemort type, we must
* perform semantic on the declaration to deduce the type.
*/
if (!d.type)
d.dsymbolSemantic(sc);
Type t = d.type;
assert(t);
if (ad.type.implicitConvTo(t) > MATCH.nomatch)
{
error(dsym.loc, "alias this is not reachable as `%s` already converts to `%s`", ad.toChars(), t.toChars());
}
}
dsym.sym = s;
// Restore alias this
ad.aliasthis = dsym;
dsym.semanticRun = PASS.semanticdone;
}
override void visit(AliasDeclaration dsym)
{
if (dsym.semanticRun >= PASS.semanticdone)
return;
assert(dsym.semanticRun <= PASS.semantic);
dsym.storage_class |= sc.stc & STC.deprecated_;
dsym.visibility = sc.visibility;
dsym.userAttribDecl = sc.userAttribDecl;
if (!sc.func && dsym.inNonRoot())
return;
aliasSemantic(dsym, sc);
}
override void visit(AliasAssign dsym)
{
//printf("visit(AliasAssign)\n");
if (dsym.semanticRun >= PASS.semanticdone)
return;
assert(dsym.semanticRun <= PASS.semantic);
if (!sc.func && dsym.inNonRoot())
return;
aliasAssignSemantic(dsym, sc);
}
override void visit(VarDeclaration dsym)
{
version (none)
{
printf("VarDeclaration::semantic('%s', parent = '%s') sem = %d\n",
dsym.toChars(), sc.parent ? sc.parent.toChars() : null, dsym.semanticRun);
printf(" type = %s\n", dsym.type ? dsym.type.toChars() : "null");
printf(" stc = x%llx\n", dsym.storage_class);
printf(" storage_class = x%llx\n", dsym.storage_class);
printf("linkage = %d\n", dsym.linkage);
//if (strcmp(toChars(), "mul") == 0) assert(0);
}
//if (semanticRun > PASS.initial)
// return;
//semanticRun = PSSsemantic;
if (dsym.semanticRun >= PASS.semanticdone)
return;
if (sc && sc.inunion && sc.inunion.isAnonDeclaration())
dsym.overlapped = true;
dsym.sequenceNumber = global.varSequenceNumber++;
Scope* scx = null;
if (dsym._scope)
{
sc = dsym._scope;
scx = sc;
dsym._scope = null;
}
if (!sc)
return;
dsym.semanticRun = PASS.semantic;
// 'static foreach' variables should not inherit scope properties
// https://issues.dlang.org/show_bug.cgi?id=19482
if ((dsym.storage_class & (STC.foreach_ | STC.local)) == (STC.foreach_ | STC.local))
{
dsym.linkage = LINK.d;
dsym.visibility = Visibility(Visibility.Kind.public_);
dsym.overlapped = false; // unset because it is modified early on this function
dsym.userAttribDecl = null; // unset because it is set by Dsymbol.setScope()
}
else
{
/* Pick up storage classes from context, but except synchronized,
* override, abstract, and final.
*/
dsym.storage_class |= (sc.stc & ~(STC.synchronized_ | STC.override_ | STC.abstract_ | STC.final_));
dsym.userAttribDecl = sc.userAttribDecl;
dsym.cppnamespace = sc.namespace;
dsym.linkage = sc.linkage;
dsym.visibility = sc.visibility;
dsym.alignment = sc.alignment();
}
if (dsym.storage_class & STC.extern_ && dsym._init)
dsym.error("extern symbols cannot have initializers");
AggregateDeclaration ad = dsym.isThis();
if (ad)
dsym.storage_class |= ad.storage_class & STC.TYPECTOR;
/* If auto type inference, do the inference
*/
int inferred = 0;
if (!dsym.type)
{
dsym.inuse++;
// Infering the type requires running semantic,
// so mark the scope as ctfe if required
bool needctfe = (dsym.storage_class & (STC.manifest | STC.static_)) != 0;
if (needctfe)
{
sc.flags |= SCOPE.condition;
sc = sc.startCTFE();
}
//printf("inferring type for %s with init %s\n", dsym.toChars(), dsym._init.toChars());
dsym._init = dsym._init.inferType(sc);
dsym.type = dsym._init.initializerToExpression(null, (sc.flags & SCOPE.Cfile) != 0).type;
if (needctfe)
sc = sc.endCTFE();
dsym.inuse--;
inferred = 1;
/* This is a kludge to support the existing syntax for RAII
* declarations.
*/
dsym.storage_class &= ~STC.auto_;
dsym.originalType = dsym.type.syntaxCopy();
}
else
{
if (!dsym.originalType)
dsym.originalType = dsym.type.syntaxCopy();
/* Prefix function attributes of variable declaration can affect
* its type:
* pure nothrow void function() fp;
* static assert(is(typeof(fp) == void function() pure nothrow));
*/
Scope* sc2 = sc.push();
sc2.stc |= (dsym.storage_class & STC.FUNCATTR);
dsym.inuse++;
dsym.type = dsym.type.typeSemantic(dsym.loc, sc2);
dsym.inuse--;
sc2.pop();
}
//printf(" semantic type = %s\n", dsym.type ? dsym.type.toChars() : "null");
if (dsym.type.ty == Terror)
dsym.errors = true;
dsym.type.checkDeprecated(dsym.loc, sc);
dsym.parent = sc.parent;
//printf("this = %p, parent = %p, '%s'\n", dsym, dsym.parent, dsym.parent.toChars());
/* If scope's alignment is the default, use the type's alignment,
* otherwise the scope overrrides.
*/
if (dsym.alignment.isDefault())
dsym.alignment = dsym.type.alignment(); // use type's alignment
//printf("sc.stc = %x\n", sc.stc);
//printf("storage_class = x%x\n", storage_class);
dsym.type.checkComplexTransition(dsym.loc, sc);
// Calculate type size + safety checks
if (sc.func && !sc.intypeof)
{
if (dsym.storage_class & STC.gshared && !dsym.isMember())
{
if (sc.func.setUnsafe())
dsym.error("__gshared not allowed in safe functions; use shared");
}
}
Dsymbol parent = dsym.toParent();
Type tb = dsym.type.toBasetype();
Type tbn = tb.baseElemOf();
if (tb.ty == Tvoid && !(dsym.storage_class & STC.lazy_))
{
if (inferred)
{
dsym.error("type `%s` is inferred from initializer `%s`, and variables cannot be of type `void`", dsym.type.toChars(), dsym._init.toChars());
}
else
dsym.error("variables cannot be of type `void`");
dsym.type = Type.terror;
tb = dsym.type;
}
if (tb.ty == Tfunction)
{
dsym.error("cannot be declared to be a function");
dsym.type = Type.terror;
tb = dsym.type;
}
if (auto ts = tb.isTypeStruct())
{
// Require declarations, except when it's just a reference (as done for pointers)
// or when the variable is defined externally
if (!ts.sym.members && !(dsym.storage_class & (STC.ref_ | STC.extern_)))
{
dsym.error("no definition of struct `%s`", ts.toChars());
// Explain why the definition is required when it's part of another type
if (!dsym.type.isTypeStruct())
{
// Prefer Loc of the dependant type
const s = dsym.type.toDsymbol(sc);
const loc = (s ? s : dsym).loc;
loc.errorSupplemental("required by type `%s`", dsym.type.toChars());
}
// Flag variable as error to avoid invalid error messages due to unknown size
dsym.type = Type.terror;
}
}
if ((dsym.storage_class & STC.auto_) && !inferred)
dsym.error("storage class `auto` has no effect if type is not inferred, did you mean `scope`?");
if (auto tt = tb.isTypeTuple())
{
/* Instead, declare variables for each of the tuple elements
* and add those.
*/
size_t nelems = Parameter.dim(tt.arguments);
Expression ie = (dsym._init && !dsym._init.isVoidInitializer()) ? dsym._init.initializerToExpression(null, (sc.flags & SCOPE.Cfile) != 0) : null;
if (ie)
ie = ie.expressionSemantic(sc);
if (nelems > 0 && ie)
{
auto iexps = new Expressions();
iexps.push(ie);
auto exps = new Expressions();
for (size_t pos = 0; pos < iexps.dim; pos++)
{
Lexpand1:
Expression e = (*iexps)[pos];
Parameter arg = Parameter.getNth(tt.arguments, pos);
arg.type = arg.type.typeSemantic(dsym.loc, sc);
//printf("[%d] iexps.dim = %d, ", pos, iexps.dim);
//printf("e = (%s %s, %s), ", Token.tochars[e.op], e.toChars(), e.type.toChars());
//printf("arg = (%s, %s)\n", arg.toChars(), arg.type.toChars());
if (e != ie)
{
if (iexps.dim > nelems)
goto Lnomatch;
if (e.type.implicitConvTo(arg.type))
continue;
}
if (auto te = e.isTupleExp())
{
if (iexps.dim - 1 + te.exps.dim > nelems)
goto Lnomatch;
iexps.remove(pos);
iexps.insert(pos, te.exps);
(*iexps)[pos] = Expression.combine(te.e0, (*iexps)[pos]);
goto Lexpand1;
}
else if (isAliasThisTuple(e))
{
auto v = copyToTemp(0, "__tup", e);
v.dsymbolSemantic(sc);
auto ve = new VarExp(dsym.loc, v);
ve.type = e.type;
exps.setDim(1);
(*exps)[0] = ve;
expandAliasThisTuples(exps, 0);
for (size_t u = 0; u < exps.dim; u++)
{
Lexpand2:
Expression ee = (*exps)[u];
arg = Parameter.getNth(tt.arguments, pos + u);
arg.type = arg.type.typeSemantic(dsym.loc, sc);
//printf("[%d+%d] exps.dim = %d, ", pos, u, exps.dim);
//printf("ee = (%s %s, %s), ", Token.tochars[ee.op], ee.toChars(), ee.type.toChars());
//printf("arg = (%s, %s)\n", arg.toChars(), arg.type.toChars());
size_t iexps_dim = iexps.dim - 1 + exps.dim;
if (iexps_dim > nelems)
goto Lnomatch;
if (ee.type.implicitConvTo(arg.type))
continue;
if (expandAliasThisTuples(exps, u) != -1)
goto Lexpand2;
}
if ((*exps)[0] != ve)
{
Expression e0 = (*exps)[0];
(*exps)[0] = new CommaExp(dsym.loc, new DeclarationExp(dsym.loc, v), e0);
(*exps)[0].type = e0.type;
iexps.remove(pos);
iexps.insert(pos, exps);
goto Lexpand1;
}
}
}
if (iexps.dim < nelems)
goto Lnomatch;
ie = new TupleExp(dsym._init.loc, iexps);
}
Lnomatch:
if (ie && ie.op == EXP.tuple)
{
auto te = ie.isTupleExp();
size_t tedim = te.exps.dim;
if (tedim != nelems)
{
error(dsym.loc, "tuple of %d elements cannot be assigned to tuple of %d elements", cast(int)tedim, cast(int)nelems);
for (size_t u = tedim; u < nelems; u++) // fill dummy expression
te.exps.push(ErrorExp.get());
}
}
auto exps = new Objects(nelems);
for (size_t i = 0; i < nelems; i++)
{
Parameter arg = Parameter.getNth(tt.arguments, i);
OutBuffer buf;
buf.printf("__%s_field_%llu", dsym.ident.toChars(), cast(ulong)i);
auto id = Identifier.idPool(buf[]);
Initializer ti;
if (ie)
{
Expression einit = ie;
if (auto te = ie.isTupleExp())
{
einit = (*te.exps)[i];
if (i == 0)
einit = Expression.combine(te.e0, einit);
}
ti = new ExpInitializer(einit.loc, einit);
}
else
ti = dsym._init ? dsym._init.syntaxCopy() : null;
StorageClass storage_class = STC.temp | STC.local | dsym.storage_class;
if ((dsym.storage_class & STC.parameter) && (arg.storageClass & STC.parameter))
storage_class |= arg.storageClass;
auto v = new VarDeclaration(dsym.loc, arg.type, id, ti, storage_class);
//printf("declaring field %s of type %s\n", v.toChars(), v.type.toChars());
v.overlapped = dsym.overlapped;
v.dsymbolSemantic(sc);
if (sc.scopesym)
{
//printf("adding %s to %s\n", v.toChars(), sc.scopesym.toChars());
if (sc.scopesym.members)
// Note this prevents using foreach() over members, because the limits can change
sc.scopesym.members.push(v);
}
Expression e = new DsymbolExp(dsym.loc, v);
(*exps)[i] = e;
}
auto v2 = new TupleDeclaration(dsym.loc, dsym.ident, exps);
v2.parent = dsym.parent;
v2.isexp = true;
dsym.aliassym = v2;
dsym.semanticRun = PASS.semanticdone;
return;
}
/* Storage class can modify the type
*/
dsym.type = dsym.type.addStorageClass(dsym.storage_class);
/* Adjust storage class to reflect type
*/
if (dsym.type.isConst())
{
dsym.storage_class |= STC.const_;
if (dsym.type.isShared())
dsym.storage_class |= STC.shared_;
}
else if (dsym.type.isImmutable())
dsym.storage_class |= STC.immutable_;
else if (dsym.type.isShared())
dsym.storage_class |= STC.shared_;
else if (dsym.type.isWild())
dsym.storage_class |= STC.wild;
if (StorageClass stc = dsym.storage_class & (STC.synchronized_ | STC.override_ | STC.abstract_ | STC.final_))
{
if (stc == STC.final_)
dsym.error("cannot be `final`, perhaps you meant `const`?");
else
{
OutBuffer buf;
stcToBuffer(&buf, stc);
dsym.error("cannot be `%s`", buf.peekChars());
}
dsym.storage_class &= ~stc; // strip off
}
// At this point we can add `scope` to the STC instead of `in`,
// because we are never going to use this variable's STC for user messages
if (dsym.storage_class & STC.in_ && global.params.previewIn)
dsym.storage_class |= STC.scope_;
if (dsym.storage_class & STC.scope_)
{
StorageClass stc = dsym.storage_class & (STC.static_ | STC.extern_ | STC.manifest | STC.gshared);
if (stc)
{
OutBuffer buf;
stcToBuffer(&buf, stc);
dsym.error("cannot be `scope` and `%s`", buf.peekChars());
}
else if (dsym.isMember())
{
dsym.error("field cannot be `scope`");
}
else if (!dsym.type.hasPointers())
{
dsym.storage_class &= ~STC.scope_; // silently ignore; may occur in generic code
}
}
if (dsym.storage_class & (STC.static_ | STC.extern_ | STC.manifest | STC.templateparameter | STC.gshared | STC.ctfe))
{
}
else
{
AggregateDeclaration aad = parent.isAggregateDeclaration();
if (aad)
{
if (global.params.vfield && dsym.storage_class & (STC.const_ | STC.immutable_) && dsym._init && !dsym._init.isVoidInitializer())
{
const(char)* s = (dsym.storage_class & STC.immutable_) ? "immutable" : "const";
message(dsym.loc, "`%s.%s` is `%s` field", ad.toPrettyChars(), dsym.toChars(), s);
}
dsym.storage_class |= STC.field;
if (auto ts = tbn.isTypeStruct())
if (ts.sym.noDefaultCtor)
{
if (!dsym.isThisDeclaration() && !dsym._init)
aad.noDefaultCtor = true;
}
}
InterfaceDeclaration id = parent.isInterfaceDeclaration();
if (id)
{
dsym.error("field not allowed in interface");
}
else if (aad && aad.sizeok == Sizeok.done)
{
dsym.error("cannot be further field because it will change the determined %s size", aad.toChars());
}
/* Templates cannot add fields to aggregates
*/
TemplateInstance ti = parent.isTemplateInstance();
if (ti)
{
// Take care of nested templates
while (1)
{
TemplateInstance ti2 = ti.tempdecl.parent.isTemplateInstance();
if (!ti2)
break;
ti = ti2;
}
// If it's a member template
AggregateDeclaration ad2 = ti.tempdecl.isMember();
if (ad2 && dsym.storage_class != STC.undefined_)
{
dsym.error("cannot use template to add field to aggregate `%s`", ad2.toChars());
}
}
}
if ((dsym.storage_class & (STC.ref_ | STC.parameter | STC.foreach_ | STC.temp | STC.result)) == STC.ref_ && dsym.ident != Id.This)
{
dsym.error("only parameters or `foreach` declarations can be `ref`");
}
if (dsym.type.hasWild())
{
if (dsym.storage_class & (STC.static_ | STC.extern_ | STC.gshared | STC.manifest | STC.field) || dsym.isDataseg())
{
dsym.error("only parameters or stack based variables can be `inout`");
}
FuncDeclaration func = sc.func;
if (func)
{
if (func.fes)
func = func.fes.func;
bool isWild = false;
for (FuncDeclaration fd = func; fd; fd = fd.toParentDecl().isFuncDeclaration())
{
if (fd.type.isTypeFunction().iswild)
{
isWild = true;
break;
}
}
if (!isWild)
{
dsym.error("`inout` variables can only be declared inside `inout` functions");
}
}
}
if (!(dsym.storage_class & (STC.ctfe | STC.extern_ | STC.ref_ | STC.result)) &&
tbn.ty == Tstruct && tbn.isTypeStruct().sym.noDefaultCtor)
{
if (!dsym._init)
{
if (dsym.isField())
{
/* For fields, we'll check the constructor later to make sure it is initialized
*/
dsym.storage_class |= STC.nodefaultctor;
}
else if (dsym.storage_class & STC.parameter)
{
}
else
dsym.error("default construction is disabled for type `%s`", dsym.type.toChars());
}
}
FuncDeclaration fd = parent.isFuncDeclaration();
if (dsym.type.isscope() && !(dsym.storage_class & STC.nodtor))
{
if (dsym.storage_class & (STC.field | STC.out_ | STC.ref_ | STC.static_ | STC.manifest | STC.gshared) || !fd)
{
dsym.error("globals, statics, fields, manifest constants, ref and out parameters cannot be `scope`");
}
// @@@DEPRECATED_2.097@@@ https://dlang.org/deprecate.html#scope%20as%20a%20type%20constraint
// Deprecated in 2.087
// Remove this when the feature is removed from the language
if (!(dsym.storage_class & STC.scope_))
{
if (!(dsym.storage_class & STC.parameter) && dsym.ident != Id.withSym)
dsym.error("reference to `scope class` must be `scope`");
}
}
// Calculate type size + safety checks
if (sc.func && !sc.intypeof)
{
if (dsym._init && dsym._init.isVoidInitializer() &&
(dsym.type.hasPointers() || dsym.type.hasInvariant())) // also computes type size
{
if (sc.func.setUnsafe())
{
if (dsym.type.hasPointers())
dsym.error("`void` initializers for pointers not allowed in safe functions");
else
dsym.error("`void` initializers for structs with invariants are not allowed in safe functions");
}
}
else if (!dsym._init &&
!(dsym.storage_class & (STC.static_ | STC.extern_ | STC.gshared | STC.manifest | STC.field | STC.parameter)) &&
dsym.type.hasVoidInitPointers())
{
if (sc.func.setUnsafe())
dsym.error("`void` initializers for pointers not allowed in safe functions");
}
}
if ((!dsym._init || dsym._init.isVoidInitializer) && !fd)
{
// If not mutable, initializable by constructor only
dsym.setInCtorOnly = true;
}
if (dsym._init)
{ } // remember we had an explicit initializer
else if (dsym.storage_class & STC.manifest)
dsym.error("manifest constants must have initializers");
bool isBlit = false;
uinteger_t sz;
if (sc.flags & SCOPE.Cfile && !dsym._init)
{
addDefaultCInitializer(dsym);
}
if (!dsym._init &&
!(dsym.storage_class & (STC.static_ | STC.gshared | STC.extern_)) &&
fd &&
(!(dsym.storage_class & (STC.field | STC.in_ | STC.foreach_ | STC.parameter | STC.result)) ||
(dsym.storage_class & STC.out_)) &&
(sz = dsym.type.size()) != 0)
{
// Provide a default initializer
//printf("Providing default initializer for '%s'\n", dsym.toChars());
if (sz == SIZE_INVALID && dsym.type.ty != Terror)
dsym.error("size of type `%s` is invalid", dsym.type.toChars());
Type tv = dsym.type;
while (tv.ty == Tsarray) // Don't skip Tenum
tv = tv.nextOf();
if (tv.needsNested())
{
/* Nested struct requires valid enclosing frame pointer.
* In StructLiteralExp::toElem(), it's calculated.
*/
assert(tbn.ty == Tstruct);
checkFrameAccess(dsym.loc, sc, tbn.isTypeStruct().sym);
Expression e = tv.defaultInitLiteral(dsym.loc);
e = new BlitExp(dsym.loc, new VarExp(dsym.loc, dsym), e);
e = e.expressionSemantic(sc);
dsym._init = new ExpInitializer(dsym.loc, e);
goto Ldtor;
}
if (tv.ty == Tstruct && tv.isTypeStruct().sym.zeroInit)
{
/* If a struct is all zeros, as a special case
* set its initializer to the integer 0.
* In AssignExp::toElem(), we check for this and issue
* a memset() to initialize the struct.
* Must do same check in interpreter.
*/
Expression e = IntegerExp.literal!0;
e = new BlitExp(dsym.loc, new VarExp(dsym.loc, dsym), e);
e.type = dsym.type; // don't type check this, it would fail
dsym._init = new ExpInitializer(dsym.loc, e);
goto Ldtor;
}
if (dsym.type.baseElemOf().ty == Tvoid)
{
dsym.error("`%s` does not have a default initializer", dsym.type.toChars());
}
else if (auto e = dsym.type.defaultInit(dsym.loc))
{
dsym._init = new ExpInitializer(dsym.loc, e);
}
// Default initializer is always a blit
isBlit = true;
}
if (dsym._init)
{
sc = sc.push();
sc.stc &= ~(STC.TYPECTOR | STC.pure_ | STC.nothrow_ | STC.nogc | STC.ref_ | STC.disable);
if (sc.flags & SCOPE.Cfile &&
dsym.type.isTypeSArray() &&
dsym.type.isTypeSArray().isIncomplete() &&
dsym._init.isVoidInitializer() &&
!(dsym.storage_class & STC.field))
{
dsym.error("incomplete array type must have initializer");
}
ExpInitializer ei = dsym._init.isExpInitializer();
if (ei) // https://issues.dlang.org/show_bug.cgi?id=13424
// Preset the required type to fail in FuncLiteralDeclaration::semantic3
ei.exp = inferType(ei.exp, dsym.type);
// If inside function, there is no semantic3() call
if (sc.func || sc.intypeof == 1)
{
// If local variable, use AssignExp to handle all the various
// possibilities.
if (fd && !(dsym.storage_class & (STC.manifest | STC.static_ | STC.gshared | STC.extern_)) && !dsym._init.isVoidInitializer())
{
//printf("fd = '%s', var = '%s'\n", fd.toChars(), toChars());
if (!ei)
{
ArrayInitializer ai = dsym._init.isArrayInitializer();
Expression e;
if (ai && tb.ty == Taarray)
e = ai.toAssocArrayLiteral();
else
e = dsym._init.initializerToExpression(null, (sc.flags & SCOPE.Cfile) != 0);
if (!e)
{
// Run semantic, but don't need to interpret
dsym._init = dsym._init.initializerSemantic(sc, dsym.type, INITnointerpret);
e = dsym._init.initializerToExpression(null, (sc.flags & SCOPE.Cfile) != 0);
if (!e)
{
dsym.error("is not a static and cannot have static initializer");
e = ErrorExp.get();