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funcsem.d
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funcsem.d
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/**
* Does semantic analysis for functions.
*
* Specification: $(LINK2 https://dlang.org/spec/function.html, Functions)
*
* Copyright: Copyright (C) 1999-2024 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/funcsem.d, _funcsem.d)
* Documentation: https://dlang.org/phobos/dmd_funcsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/funcsem.d
*/
module dmd.funcsem;
import core.stdc.stdio;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astenums;
import dmd.attrib;
import dmd.blockexit;
import dmd.gluelayer;
import dmd.dcast;
import dmd.dclass;
import dmd.declaration;
import dmd.delegatize;
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.escape;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.importc;
import dmd.init;
import dmd.location;
import dmd.mtype;
import dmd.mustuse;
import dmd.objc;
import dmd.opover;
import dmd.pragmasem;
import dmd.root.aav;
import dmd.common.outbuffer;
import dmd.rootobject;
import dmd.root.filename;
import dmd.root.string;
import dmd.root.stringtable;
import dmd.semantic2;
import dmd.semantic3;
import dmd.statement_rewrite_walker;
import dmd.statement;
import dmd.statementsem;
import dmd.target;
import dmd.templatesem;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
/* Tweak all return statements and dtor call for nrvo_var, for correct NRVO.
*/
extern (C++) final class NrvoWalker : StatementRewriteWalker
{
alias visit = typeof(super).visit;
public:
FuncDeclaration fd;
Scope* sc;
override void visit(ReturnStatement s)
{
// See if all returns are instead to be replaced with a goto returnLabel;
if (fd.returnLabel)
{
/* Rewrite:
* return exp;
* as:
* vresult = exp; goto Lresult;
*/
auto gs = new GotoStatement(s.loc, Id.returnLabel);
gs.label = fd.returnLabel;
Statement s1 = gs;
if (s.exp)
s1 = new CompoundStatement(s.loc, new ExpStatement(s.loc, s.exp), gs);
replaceCurrent(s1);
}
}
override void visit(TryFinallyStatement s)
{
DtorExpStatement des;
if (fd.isNRVO() && s.finalbody && (des = s.finalbody.isDtorExpStatement()) !is null &&
fd.nrvo_var == des.var)
{
if (!(global.params.useExceptions && ClassDeclaration.throwable))
{
/* Don't need to call destructor at all, since it is nrvo
*/
replaceCurrent(s._body);
s._body.accept(this);
return;
}
/* Normally local variable dtors are called regardless exceptions.
* But for nrvo_var, its dtor should be called only when exception is thrown.
*
* Rewrite:
* try { s.body; } finally { nrvo_var.edtor; }
* // equivalent with:
* // s.body; scope(exit) nrvo_var.edtor;
* as:
* try { s.body; } catch(Throwable __o) { nrvo_var.edtor; throw __o; }
* // equivalent with:
* // s.body; scope(failure) nrvo_var.edtor;
*/
Statement sexception = new DtorExpStatement(Loc.initial, fd.nrvo_var.edtor, fd.nrvo_var);
Identifier id = Identifier.generateId("__o");
Statement handler = new PeelStatement(sexception);
if (sexception.blockExit(fd, null) & BE.fallthru)
{
auto ts = new ThrowStatement(Loc.initial, new IdentifierExp(Loc.initial, id));
ts.internalThrow = true;
handler = new CompoundStatement(Loc.initial, handler, ts);
}
auto catches = new Catches();
auto ctch = new Catch(Loc.initial, getThrowable(), id, handler);
ctch.internalCatch = true;
ctch.catchSemantic(sc); // Run semantic to resolve identifier '__o'
catches.push(ctch);
Statement s2 = new TryCatchStatement(Loc.initial, s._body, catches);
fd.hasNoEH = false;
replaceCurrent(s2);
s2.accept(this);
}
else
StatementRewriteWalker.visit(s);
}
}
/**********************************
* Main semantic routine for functions.
*/
void funcDeclarationSemantic(Scope* sc, FuncDeclaration funcdecl)
{
version (none)
{
printf("FuncDeclaration::semantic(sc = %p, this = %p, '%s', linkage = %d)\n", sc, funcdecl, funcdecl.toPrettyChars(), sc.linkage);
if (funcdecl.isFuncLiteralDeclaration())
printf("\tFuncLiteralDeclaration()\n");
printf("sc.parent = %s, parent = %s\n", sc.parent.toChars(), funcdecl.parent ? funcdecl.parent.toChars() : "");
printf("type: %p, %s\n", funcdecl.type, funcdecl.type.toChars());
}
if (funcdecl.semanticRun != PASS.initial && funcdecl.isFuncLiteralDeclaration())
{
/* Member functions that have return types that are
* forward references can have semantic() run more than
* once on them.
* See test\interface2.d, test20
*/
return;
}
if (funcdecl.semanticRun >= PASS.semanticdone)
return;
assert(funcdecl.semanticRun <= PASS.semantic);
funcdecl.semanticRun = PASS.semantic;
if (funcdecl._scope)
{
sc = funcdecl._scope;
funcdecl._scope = null;
}
if (!sc || funcdecl.errors)
return;
funcdecl.cppnamespace = sc.namespace;
funcdecl.parent = sc.parent;
Dsymbol parent = funcdecl.toParent();
funcdecl.foverrides.setDim(0); // reset in case semantic() is being retried for this function
funcdecl.storage_class |= sc.stc & ~STC.ref_;
AggregateDeclaration ad = funcdecl.isThis();
// Don't nest structs b/c of generated methods which should not access the outer scopes.
// https://issues.dlang.org/show_bug.cgi?id=16627
if (ad && !funcdecl.isGenerated())
{
funcdecl.storage_class |= ad.storage_class & (STC.TYPECTOR | STC.synchronized_);
ad.makeNested();
}
if (sc.func)
funcdecl.storage_class |= sc.func.storage_class & STC.disable;
// Remove prefix storage classes silently.
if ((funcdecl.storage_class & STC.TYPECTOR) && !(ad || funcdecl.isNested()))
funcdecl.storage_class &= ~STC.TYPECTOR;
//printf("function storage_class = x%llx, sc.stc = x%llx, %x\n", storage_class, sc.stc, Declaration.isFinal());
if (sc.flags & SCOPE.compile)
funcdecl.skipCodegen = true;
funcdecl._linkage = sc.linkage;
if (sc.flags & SCOPE.Cfile && funcdecl.isFuncLiteralDeclaration())
funcdecl._linkage = LINK.d; // so they are uniquely mangled
if (auto fld = funcdecl.isFuncLiteralDeclaration())
{
if (fld.treq)
{
Type treq = fld.treq;
assert(treq.nextOf().ty == Tfunction);
if (treq.ty == Tdelegate)
fld.tok = TOK.delegate_;
else if (treq.isPtrToFunction())
fld.tok = TOK.function_;
else
assert(0);
funcdecl._linkage = treq.nextOf().toTypeFunction().linkage;
}
}
// evaluate pragma(inline)
if (auto pragmadecl = sc.inlining)
funcdecl.inlining = evalPragmaInline(pragmadecl.loc, sc, pragmadecl.args);
funcdecl.visibility = sc.visibility;
funcdecl.userAttribDecl = sc.userAttribDecl;
UserAttributeDeclaration.checkGNUABITag(funcdecl, funcdecl._linkage);
checkMustUseReserved(funcdecl);
if (!funcdecl.originalType)
funcdecl.originalType = funcdecl.type.syntaxCopy();
static TypeFunction getFunctionType(FuncDeclaration fd)
{
if (auto tf = fd.type.isTypeFunction())
return tf;
if (!fd.type.isTypeError())
{
.error(fd.loc, "%s `%s` `%s` must be a function instead of `%s`", fd.kind, fd.toPrettyChars, fd.toChars(), fd.type.toChars());
fd.type = Type.terror;
}
fd.errors = true;
return null;
}
if (sc.flags & SCOPE.Cfile)
{
/* C11 allows a function to be declared with a typedef, D does not.
*/
if (auto ti = funcdecl.type.isTypeIdentifier())
{
auto tj = ti.typeSemantic(funcdecl.loc, sc);
if (auto tjf = tj.isTypeFunction())
{
/* Copy the type instead of just pointing to it,
* as we don't merge function types
*/
auto tjf2 = new TypeFunction(tjf.parameterList, tjf.next, tjf.linkage);
funcdecl.type = tjf2;
funcdecl.originalType = tjf2;
}
}
}
if (!getFunctionType(funcdecl))
return;
if (!funcdecl.type.deco)
{
sc = sc.push();
sc.stc |= funcdecl.storage_class & (STC.disable | STC.deprecated_); // forward to function type
TypeFunction tf = funcdecl.type.toTypeFunction();
if (sc.func)
{
/* If the nesting parent is pure without inference,
* then this function defaults to pure too.
*
* auto foo() pure {
* auto bar() {} // become a weak purity function
* class C { // nested class
* auto baz() {} // become a weak purity function
* }
*
* static auto boo() {} // typed as impure
* // Even though, boo cannot call any impure functions.
* // See also Expression::checkPurity().
* }
*/
if (tf.purity == PURE.impure && (funcdecl.isNested() || funcdecl.isThis()))
{
FuncDeclaration fd = null;
for (Dsymbol p = funcdecl.toParent2(); p; p = p.toParent2())
{
if (AggregateDeclaration adx = p.isAggregateDeclaration())
{
if (adx.isNested())
continue;
break;
}
if ((fd = p.isFuncDeclaration()) !is null)
break;
}
/* If the parent's purity is inferred, then this function's purity needs
* to be inferred first.
*/
if (fd && fd.isPureBypassingInference() >= PURE.weak && !funcdecl.isInstantiated())
{
tf.purity = PURE.fwdref; // default to pure
}
}
}
if (tf.isref)
sc.stc |= STC.ref_;
if (tf.isScopeQual)
sc.stc |= STC.scope_;
if (tf.isnothrow)
sc.stc |= STC.nothrow_;
if (tf.isnogc)
sc.stc |= STC.nogc;
if (tf.isproperty)
sc.stc |= STC.property;
if (tf.purity == PURE.fwdref)
sc.stc |= STC.pure_;
if (tf.trust != TRUST.default_)
{
sc.stc &= ~STC.safeGroup;
if (tf.trust == TRUST.safe)
sc.stc |= STC.safe;
else if (tf.trust == TRUST.system)
sc.stc |= STC.system;
else if (tf.trust == TRUST.trusted)
sc.stc |= STC.trusted;
}
if (funcdecl.isCtorDeclaration())
{
tf.isctor = true;
Type tret = ad.handleType();
assert(tret);
tret = tret.addStorageClass(funcdecl.storage_class | sc.stc);
tret = tret.addMod(funcdecl.type.mod);
tf.next = tret;
if (ad.isStructDeclaration())
sc.stc |= STC.ref_;
}
// 'return' on a non-static class member function implies 'scope' as well
if (ad && ad.isClassDeclaration() && (tf.isreturn || sc.stc & STC.return_) && !(sc.stc & STC.static_))
sc.stc |= STC.scope_;
// If 'this' has no pointers, remove 'scope' as it has no meaning
// Note: this is already covered by semantic of `VarDeclaration` and `TypeFunction`,
// but existing code relies on `hasPointers()` being called here to resolve forward references:
// https://github.com/dlang/dmd/pull/14232#issuecomment-1162906573
if (sc.stc & STC.scope_ && ad && ad.isStructDeclaration() && !ad.type.hasPointers())
{
sc.stc &= ~STC.scope_;
tf.isScopeQual = false;
if (tf.isreturnscope)
{
sc.stc &= ~(STC.return_ | STC.returnScope);
tf.isreturn = false;
tf.isreturnscope = false;
}
}
sc.linkage = funcdecl._linkage;
if (!tf.isNaked() && !(funcdecl.isThis() || funcdecl.isNested()))
{
import core.bitop : popcnt;
auto mods = MODtoChars(tf.mod);
.error(funcdecl.loc, "%s `%s` without `this` cannot be `%s`", funcdecl.kind, funcdecl.toPrettyChars, mods);
if (tf.next && tf.next.ty != Tvoid && popcnt(tf.mod) == 1)
.errorSupplemental(funcdecl.loc,
"did you mean to use `%s(%s)` as the return type?", mods, tf.next.toChars());
tf.mod = 0; // remove qualifiers
}
/* Apply const, immutable, wild and shared storage class
* to the function type. Do this before type semantic.
*/
auto stc = funcdecl.storage_class;
if (funcdecl.type.isImmutable())
stc |= STC.immutable_;
if (funcdecl.type.isConst())
stc |= STC.const_;
if (funcdecl.type.isShared() || funcdecl.storage_class & STC.synchronized_)
stc |= STC.shared_;
if (funcdecl.type.isWild())
stc |= STC.wild;
funcdecl.type = funcdecl.type.addSTC(stc);
funcdecl.type = funcdecl.type.typeSemantic(funcdecl.loc, sc);
sc = sc.pop();
}
auto f = getFunctionType(funcdecl);
if (!f)
return; // funcdecl's type is not a function
{
// Merge back function attributes into 'originalType'.
// It's used for mangling, ddoc, and json output.
TypeFunction tfo = funcdecl.originalType.toTypeFunction();
tfo.mod = f.mod;
tfo.isScopeQual = f.isScopeQual;
tfo.isreturninferred = f.isreturninferred;
tfo.isscopeinferred = f.isscopeinferred;
tfo.isref = f.isref;
tfo.isnothrow = f.isnothrow;
tfo.isnogc = f.isnogc;
tfo.isproperty = f.isproperty;
tfo.purity = f.purity;
tfo.trust = f.trust;
funcdecl.storage_class &= ~(STC.TYPECTOR | STC.FUNCATTR);
}
// check pragma(crt_constructor) signature
if (funcdecl.isCrtCtor || funcdecl.isCrtDtor)
{
const idStr = funcdecl.isCrtCtor ? "crt_constructor" : "crt_destructor";
if (f.nextOf().ty != Tvoid)
.error(funcdecl.loc, "%s `%s` must return `void` for `pragma(%s)`", funcdecl.kind, funcdecl.toPrettyChars, idStr.ptr);
if (funcdecl._linkage != LINK.c && f.parameterList.length != 0)
.error(funcdecl.loc, "%s `%s` must be `extern(C)` for `pragma(%s)` when taking parameters", funcdecl.kind, funcdecl.toPrettyChars, idStr.ptr);
if (funcdecl.isThis())
.error(funcdecl.loc, "%s `%s` cannot be a non-static member function for `pragma(%s)`", funcdecl.kind, funcdecl.toPrettyChars, idStr.ptr);
}
if (funcdecl.overnext && funcdecl.isCsymbol())
{
/* C does not allow function overloading, but it does allow
* redeclarations of the same function. If .overnext points
* to a redeclaration, ok. Error if it is an overload.
*/
auto fnext = funcdecl.overnext.isFuncDeclaration();
funcDeclarationSemantic(sc, fnext);
auto fn = fnext.type.isTypeFunction();
if (!fn || !cFuncEquivalence(f, fn))
{
.error(funcdecl.loc, "%s `%s` redeclaration with different type", funcdecl.kind, funcdecl.toPrettyChars);
//printf("t1: %s\n", f.toChars());
//printf("t2: %s\n", fn.toChars());
}
funcdecl.overnext = null; // don't overload the redeclarations
}
if ((funcdecl.storage_class & STC.auto_) && !f.isref && !funcdecl.inferRetType)
.error(funcdecl.loc, "%s `%s` storage class `auto` has no effect if return type is not inferred", funcdecl.kind, funcdecl.toPrettyChars);
if (f.isreturn && !funcdecl.needThis() && !funcdecl.isNested())
{
/* Non-static nested functions have a hidden 'this' pointer to which
* the 'return' applies
*/
if (sc.scopesym && sc.scopesym.isAggregateDeclaration())
.error(funcdecl.loc, "%s `%s` `static` member has no `this` to which `return` can apply", funcdecl.kind, funcdecl.toPrettyChars);
else
error(funcdecl.loc, "top-level function `%s` has no `this` to which `return` can apply", funcdecl.toChars());
}
if (funcdecl.isAbstract() && !funcdecl.isVirtual())
{
const(char)* sfunc;
if (funcdecl.isStatic())
sfunc = "static";
else if (funcdecl.visibility.kind == Visibility.Kind.private_ || funcdecl.visibility.kind == Visibility.Kind.package_)
sfunc = visibilityToChars(funcdecl.visibility.kind);
else
sfunc = "final";
.error(funcdecl.loc, "%s `%s` `%s` functions cannot be `abstract`", funcdecl.kind, funcdecl.toPrettyChars, sfunc);
}
if (funcdecl.isOverride() && !funcdecl.isVirtual() && !funcdecl.isFuncLiteralDeclaration())
{
Visibility.Kind kind = funcdecl.visible().kind;
if ((kind == Visibility.Kind.private_ || kind == Visibility.Kind.package_) && funcdecl.isMember())
.error(funcdecl.loc, "%s `%s` `%s` method is not virtual and cannot override", funcdecl.kind, funcdecl.toPrettyChars, visibilityToChars(kind));
else
.error(funcdecl.loc, "%s `%s` cannot override a non-virtual function", funcdecl.kind, funcdecl.toPrettyChars);
}
if (funcdecl.isAbstract() && funcdecl.isFinalFunc())
.error(funcdecl.loc, "%s `%s` cannot be both `final` and `abstract`", funcdecl.kind, funcdecl.toPrettyChars);
if (funcdecl.printf || funcdecl.scanf)
{
checkPrintfScanfSignature(funcdecl, f, sc);
}
if (auto id = parent.isInterfaceDeclaration())
{
funcdecl.storage_class |= STC.abstract_;
if (funcdecl.isCtorDeclaration() || funcdecl.isPostBlitDeclaration() || funcdecl.isDtorDeclaration() || funcdecl.isInvariantDeclaration() || funcdecl.isNewDeclaration() || funcdecl.isDelete())
.error(funcdecl.loc, "%s `%s` constructors, destructors, postblits, invariants, new and delete functions are not allowed in interface `%s`", funcdecl.kind, funcdecl.toPrettyChars, id.toChars());
if (funcdecl.fbody && funcdecl.isVirtual())
.error(funcdecl.loc, "%s `%s` function body only allowed in `final` functions in interface `%s`", funcdecl.kind, funcdecl.toPrettyChars, id.toChars());
}
if (UnionDeclaration ud = parent.isUnionDeclaration())
{
if (funcdecl.isPostBlitDeclaration() || funcdecl.isDtorDeclaration() || funcdecl.isInvariantDeclaration())
.error(funcdecl.loc, "%s `%s` destructors, postblits and invariants are not allowed in union `%s`", funcdecl.kind, funcdecl.toPrettyChars, ud.toChars());
}
if (StructDeclaration sd = parent.isStructDeclaration())
{
if (funcdecl.isCtorDeclaration())
{
goto Ldone;
}
}
if (ClassDeclaration cd = parent.isClassDeclaration())
{
parent = cd = objc.getParent(funcdecl, cd);
if (funcdecl.isCtorDeclaration())
{
goto Ldone;
}
if (funcdecl.storage_class & STC.abstract_)
cd.isabstract = ThreeState.yes;
// if static function, do not put in vtbl[]
if (!funcdecl.isVirtual())
{
//printf("\tnot virtual\n");
goto Ldone;
}
// Suppress further errors if the return type is an error
if (funcdecl.type.nextOf() == Type.terror)
goto Ldone;
bool may_override = false;
for (size_t i = 0; i < cd.baseclasses.length; i++)
{
BaseClass* b = (*cd.baseclasses)[i];
ClassDeclaration cbd = b.type.toBasetype().isClassHandle();
if (!cbd)
continue;
for (size_t j = 0; j < cbd.vtbl.length; j++)
{
FuncDeclaration f2 = cbd.vtbl[j].isFuncDeclaration();
if (!f2 || f2.ident != funcdecl.ident)
continue;
if (cbd.parent && cbd.parent.isTemplateInstance())
{
if (!functionSemantic(f2))
goto Ldone;
}
may_override = true;
}
}
if (may_override && funcdecl.type.nextOf() is null)
{
/* If same name function exists in base class but 'this' is auto return,
* cannot find index of base class's vtbl[] to override.
*/
.error(funcdecl.loc, "%s `%s` return type inference is not supported if may override base class function", funcdecl.kind, funcdecl.toPrettyChars);
}
/* Find index of existing function in base class's vtbl[] to override
* (the index will be the same as in cd's current vtbl[])
*/
int vi = cd.baseClass ? findVtblIndex(funcdecl, cd.baseClass.vtbl[]) : -1;
bool doesoverride = false;
switch (vi)
{
case -1:
Lintro:
/* Didn't find one, so
* This is an 'introducing' function which gets a new
* slot in the vtbl[].
*/
// Verify this doesn't override previous final function
if (cd.baseClass)
{
Dsymbol s = cd.baseClass.search(funcdecl.loc, funcdecl.ident);
if (s)
{
if (auto f2 = s.isFuncDeclaration())
{
f2 = f2.overloadExactMatch(funcdecl.type);
if (f2 && f2.isFinalFunc() && f2.visible().kind != Visibility.Kind.private_)
.error(funcdecl.loc, "%s `%s` cannot override `final` function `%s`", funcdecl.kind, funcdecl.toPrettyChars, f2.toPrettyChars());
}
}
}
/* These quirky conditions mimic what happens when virtual
inheritance is implemented by producing a virtual base table
with offsets to each of the virtual bases.
*/
if (target.cpp.splitVBasetable && cd.classKind == ClassKind.cpp &&
cd.baseClass && cd.baseClass.vtbl.length)
{
/* if overriding an interface function, then this is not
* introducing and don't put it in the class vtbl[]
*/
funcdecl.interfaceVirtual = overrideInterface(funcdecl);
if (funcdecl.interfaceVirtual)
{
//printf("\tinterface function %s\n", toChars());
cd.vtblFinal.push(funcdecl);
goto Linterfaces;
}
}
if (funcdecl.isFinalFunc())
{
// Don't check here, as it may override an interface function
//if (isOverride())
// error("is marked as override, but does not override any function");
cd.vtblFinal.push(funcdecl);
}
else
{
//printf("\tintroducing function %s\n", funcdecl.toChars());
funcdecl.isIntroducing = true;
if (cd.classKind == ClassKind.cpp && target.cpp.reverseOverloads)
{
/* Overloaded functions with same name are grouped and in reverse order.
* Search for first function of overload group, and insert
* funcdecl into vtbl[] immediately before it.
*/
funcdecl.vtblIndex = cast(int)cd.vtbl.length;
bool found;
foreach (const i, s; cd.vtbl)
{
if (found)
// the rest get shifted forward
++s.isFuncDeclaration().vtblIndex;
else if (s.ident == funcdecl.ident && s.parent == parent)
{
// found first function of overload group
funcdecl.vtblIndex = cast(int)i;
found = true;
++s.isFuncDeclaration().vtblIndex;
}
}
cd.vtbl.insert(funcdecl.vtblIndex, funcdecl);
debug foreach (const i, s; cd.vtbl)
{
// a C++ dtor gets its vtblIndex later (and might even be added twice to the vtbl),
// e.g. when compiling druntime with a debug compiler, namely with core.stdcpp.exception.
if (auto fd = s.isFuncDeclaration())
assert(fd.vtblIndex == i ||
(cd.classKind == ClassKind.cpp && fd.isDtorDeclaration) ||
funcdecl.parent.isInterfaceDeclaration); // interface functions can be in multiple vtbls
}
}
else
{
// Append to end of vtbl[]
vi = cast(int)cd.vtbl.length;
cd.vtbl.push(funcdecl);
funcdecl.vtblIndex = vi;
}
}
break;
case -2:
// can't determine because of forward references
funcdecl.errors = true;
return;
default:
{
if (vi >= cd.vtbl.length)
{
/* the derived class cd doesn't have its vtbl[] allocated yet.
* https://issues.dlang.org/show_bug.cgi?id=21008
*/
.error(funcdecl.loc, "%s `%s` circular reference to class `%s`", funcdecl.kind, funcdecl.toPrettyChars, cd.toChars());
funcdecl.errors = true;
return;
}
FuncDeclaration fdv = cd.baseClass.vtbl[vi].isFuncDeclaration();
FuncDeclaration fdc = cd.vtbl[vi].isFuncDeclaration();
// This function is covariant with fdv
if (fdc == funcdecl)
{
doesoverride = true;
break;
}
auto vtf = getFunctionType(fdv);
if (vtf.trust > TRUST.system && f.trust == TRUST.system)
.error(funcdecl.loc, "%s `%s` cannot override `@safe` method `%s` with a `@system` attribute", funcdecl.kind, funcdecl.toPrettyChars,
fdv.toPrettyChars);
if (fdc.toParent() == parent)
{
//printf("vi = %d,\tthis = %p %s %s @ [%s]\n\tfdc = %p %s %s @ [%s]\n\tfdv = %p %s %s @ [%s]\n",
// vi, this, this.toChars(), this.type.toChars(), this.loc.toChars(),
// fdc, fdc .toChars(), fdc .type.toChars(), fdc .loc.toChars(),
// fdv, fdv .toChars(), fdv .type.toChars(), fdv .loc.toChars());
// fdc overrides fdv exactly, then this introduces new function.
if (fdc.type.mod == fdv.type.mod && funcdecl.type.mod != fdv.type.mod)
goto Lintro;
}
if (fdv.isDeprecated && !funcdecl.isDeprecated)
deprecation(funcdecl.loc, "`%s` is overriding the deprecated method `%s`",
funcdecl.toPrettyChars, fdv.toPrettyChars);
// This function overrides fdv
if (fdv.isFinalFunc())
.error(funcdecl.loc, "%s `%s` cannot override `final` function `%s`", funcdecl.kind, funcdecl.toPrettyChars, fdv.toPrettyChars());
if (!funcdecl.isOverride())
{
if (fdv.isFuture())
{
deprecation(funcdecl.loc, "`@__future` base class method `%s` is being overridden by `%s`; rename the latter", fdv.toPrettyChars(), funcdecl.toPrettyChars());
// Treat 'this' as an introducing function, giving it a separate hierarchy in the vtbl[]
goto Lintro;
}
else
{
// https://issues.dlang.org/show_bug.cgi?id=17349
error(funcdecl.loc, "cannot implicitly override base class method `%s` with `%s`; add `override` attribute",
fdv.toPrettyChars(), funcdecl.toPrettyChars());
}
}
doesoverride = true;
if (fdc.toParent() == parent)
{
// If both are mixins, or both are not, then error.
// If either is not, the one that is not overrides the other.
bool thismixin = funcdecl.parent.isClassDeclaration() !is null;
bool fdcmixin = fdc.parent.isClassDeclaration() !is null;
if (thismixin == fdcmixin)
{
.error(funcdecl.loc, "%s `%s` multiple overrides of same function", funcdecl.kind, funcdecl.toPrettyChars);
}
/*
* https://issues.dlang.org/show_bug.cgi?id=711
*
* If an overriding method is introduced through a mixin,
* we need to update the vtbl so that both methods are
* present.
*/
else if (thismixin)
{
/* if the mixin introduced the overriding method, then reintroduce it
* in the vtbl. The initial entry for the mixined method
* will be updated at the end of the enclosing `if` block
* to point to the current (non-mixined) function.
*/
auto vitmp = cast(int)cd.vtbl.length;
cd.vtbl.push(fdc);
fdc.vtblIndex = vitmp;
}
else if (fdcmixin)
{
/* if the current overriding function is coming from a
* mixined block, then push the current function in the
* vtbl, but keep the previous (non-mixined) function as
* the overriding one.
*/
auto vitmp = cast(int)cd.vtbl.length;
cd.vtbl.push(funcdecl);
funcdecl.vtblIndex = vitmp;
break;
}
else // fdc overrides fdv
{
// this doesn't override any function
break;
}
}
cd.vtbl[vi] = funcdecl;
funcdecl.vtblIndex = vi;
/* Remember which functions this overrides
*/
funcdecl.foverrides.push(fdv);
/* This works by whenever this function is called,
* it actually returns tintro, which gets dynamically
* cast to type. But we know that tintro is a base
* of type, so we could optimize it by not doing a
* dynamic cast, but just subtracting the isBaseOf()
* offset if the value is != null.
*/
if (fdv.tintro)
funcdecl.tintro = fdv.tintro;
else if (!funcdecl.type.equals(fdv.type))
{
auto tnext = funcdecl.type.nextOf();
if (auto handle = tnext.isClassHandle())
{
if (handle.semanticRun < PASS.semanticdone && !handle.isBaseInfoComplete())
handle.dsymbolSemantic(null);
}
/* Only need to have a tintro if the vptr
* offsets differ
*/
int offset;
if (fdv.type.nextOf().isBaseOf(tnext, &offset))
{
funcdecl.tintro = fdv.type;
}
}
break;
}
}
/* Go through all the interface bases.
* If this function is covariant with any members of those interface
* functions, set the tintro.
*/
Linterfaces:
bool foundVtblMatch = false;
for (ClassDeclaration bcd = cd; !foundVtblMatch && bcd; bcd = bcd.baseClass)
{
foreach (b; bcd.interfaces)
{
vi = findVtblIndex(funcdecl, b.sym.vtbl[]);
switch (vi)
{
case -1:
break;
case -2:
// can't determine because of forward references
funcdecl.errors = true;
return;
default:
{
auto fdv = cast(FuncDeclaration)b.sym.vtbl[vi];
Type ti = null;
foundVtblMatch = true;
/* Remember which functions this overrides
*/
funcdecl.foverrides.push(fdv);
if (fdv.tintro)
ti = fdv.tintro;
else if (!funcdecl.type.equals(fdv.type))
{
/* Only need to have a tintro if the vptr
* offsets differ
*/
int offset;
if (fdv.type.nextOf().isBaseOf(funcdecl.type.nextOf(), &offset))
{
ti = fdv.type;
}
}
if (ti)
{
if (funcdecl.tintro)
{
if (!funcdecl.tintro.nextOf().equals(ti.nextOf()) && !funcdecl.tintro.nextOf().isBaseOf(ti.nextOf(), null) && !ti.nextOf().isBaseOf(funcdecl.tintro.nextOf(), null))
{
.error(funcdecl.loc, "%s `%s` incompatible covariant types `%s` and `%s`", funcdecl.kind, funcdecl.toPrettyChars, funcdecl.tintro.toChars(), ti.toChars());
}
}
else
{
funcdecl.tintro = ti;
}
}
}
}
}
}
if (foundVtblMatch)
{
goto L2;
}
if (!doesoverride && funcdecl.isOverride() && (funcdecl.type.nextOf() || !may_override))
{
BaseClass* bc = null;
Dsymbol s = null;
for (size_t i = 0; i < cd.baseclasses.length; i++)
{
bc = (*cd.baseclasses)[i];
s = bc.sym.search_correct(funcdecl.ident);
if (s)
break;
}
if (s)
{
HdrGenState hgs;
OutBuffer buf;
auto fd = s.isFuncDeclaration();
functionToBufferFull(cast(TypeFunction)(funcdecl.type), buf,
new Identifier(funcdecl.toPrettyChars()), hgs, null);
const(char)* funcdeclToChars = buf.peekChars();
if (fd)
{
OutBuffer buf1;
if (fd.ident == funcdecl.ident)
hgs.fullQual = true;
// https://issues.dlang.org/show_bug.cgi?id=23745
// If the potentially overridden function contains errors,
// inform the user to fix that one first
if (fd.errors)
{
error(funcdecl.loc, "function `%s` does not override any function, did you mean to override `%s`?",
funcdecl.toChars(), fd.toPrettyChars());
errorSupplemental(fd.loc, "Function `%s` contains errors in its declaration, therefore it cannot be correctly overridden",
fd.toPrettyChars());
}
else
{
functionToBufferFull(cast(TypeFunction)(fd.type), buf1,
new Identifier(fd.toPrettyChars()), hgs, null);
error(funcdecl.loc, "function `%s` does not override any function, did you mean to override `%s`?",
funcdeclToChars, buf1.peekChars());
}
}
else
{
error(funcdecl.loc, "function `%s` does not override any function, did you mean to override %s `%s`?",
funcdeclToChars, s.kind, s.toPrettyChars());
errorSupplemental(funcdecl.loc, "Functions are the only declarations that may be overridden");
}
}
else
.error(funcdecl.loc, "%s `%s` does not override any function", funcdecl.kind, funcdecl.toPrettyChars);
}
L2:
objc.setSelector(funcdecl, sc);
objc.checkLinkage(funcdecl);
objc.addToClassMethodList(funcdecl, cd);
objc.setAsOptional(funcdecl, sc);
/* Go through all the interface bases.
* Disallow overriding any final functions in the interface(s).
*/
foreach (b; cd.interfaces)
{
if (b.sym)
{
if (auto s = search_function(b.sym, funcdecl.ident))
{
if (auto f2 = s.isFuncDeclaration())
{
f2 = f2.overloadExactMatch(funcdecl.type);
if (f2 && f2.isFinalFunc() && f2.visible().kind != Visibility.Kind.private_)
.error(funcdecl.loc, "%s `%s` cannot override `final` function `%s.%s`", funcdecl.kind, funcdecl.toPrettyChars, b.sym.toChars(), f2.toPrettyChars());
}
}
}
}
if (funcdecl.isOverride)
{
if (funcdecl.storage_class & STC.disable)
deprecation(funcdecl.loc,
"`%s` cannot be annotated with `@disable` because it is overriding a function in the base class",
funcdecl.toPrettyChars);