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typinf.d
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typinf.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/typeinf.d, _typeinf.d)
* Documentation: https://dlang.org/phobos/dmd_typinf.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/typinf.d
*/
module dmd.typinf;
import dmd.declaration;
import dmd.dmodule;
import dmd.dscope;
import dmd.dclass;
import dmd.dstruct;
import dmd.errors;
import dmd.globals;
import dmd.gluelayer;
import dmd.mtype;
import dmd.visitor;
import core.stdc.stdio;
/****************************************************
* Generates the `TypeInfo` object associated with `torig` if it
* hasn't already been generated
* Params:
* loc = the location for reporting line numbers in errors
* torig = the type to generate the `TypeInfo` object for
* sc = the scope
*/
void genTypeInfo(Loc loc, Type torig, Scope* sc)
{
// printf("genTypeInfo() %s\n", torig.toChars());
// Even when compiling without `useTypeInfo` (e.g. -betterC) we should
// still be able to evaluate `TypeInfo` at compile-time, just not at runtime.
// https://issues.dlang.org/show_bug.cgi?id=18472
if (!sc || !(sc.flags & SCOPE.ctfe))
{
if (!global.params.useTypeInfo)
{
.error(loc, "`TypeInfo` cannot be used with -betterC");
fatal();
}
}
if (!Type.dtypeinfo)
{
.error(loc, "`object.TypeInfo` could not be found, but is implicitly used");
fatal();
}
Type t = torig.merge2(); // do this since not all Type's are merge'd
if (!t.vtinfo)
{
if (t.isShared()) // does both 'shared' and 'shared const'
t.vtinfo = TypeInfoSharedDeclaration.create(t);
else if (t.isConst())
t.vtinfo = TypeInfoConstDeclaration.create(t);
else if (t.isImmutable())
t.vtinfo = TypeInfoInvariantDeclaration.create(t);
else if (t.isWild())
t.vtinfo = TypeInfoWildDeclaration.create(t);
else
t.vtinfo = getTypeInfoDeclaration(t);
assert(t.vtinfo);
/* If this has a custom implementation in std/typeinfo, then
* do not generate a COMDAT for it.
*/
if (!builtinTypeInfo(t))
{
// Generate COMDAT
if (sc) // if in semantic() pass
{
// Find module that will go all the way to an object file
Module m = sc._module.importedFrom;
m.members.push(t.vtinfo);
}
else // if in obj generation pass
{
toObjFile(t.vtinfo, global.params.multiobj);
}
}
}
if (!torig.vtinfo)
torig.vtinfo = t.vtinfo; // Types aren't merged, but we can share the vtinfo's
assert(torig.vtinfo);
}
/****************************************************
* Gets the type of the `TypeInfo` object associated with `t`
* Params:
* loc = the location for reporting line nunbers in errors
* t = the type to get the type of the `TypeInfo` object for
* sc = the scope
* Returns:
* The type of the `TypeInfo` object associated with `t`
*/
extern (C++) Type getTypeInfoType(Loc loc, Type t, Scope* sc)
{
assert(t.ty != Terror);
genTypeInfo(loc, t, sc);
return t.vtinfo.type;
}
private TypeInfoDeclaration getTypeInfoDeclaration(Type t)
{
//printf("Type::getTypeInfoDeclaration() %s\n", t.toChars());
switch (t.ty)
{
case Tpointer:
return TypeInfoPointerDeclaration.create(t);
case Tarray:
return TypeInfoArrayDeclaration.create(t);
case Tsarray:
return TypeInfoStaticArrayDeclaration.create(t);
case Taarray:
return TypeInfoAssociativeArrayDeclaration.create(t);
case Tstruct:
return TypeInfoStructDeclaration.create(t);
case Tvector:
return TypeInfoVectorDeclaration.create(t);
case Tenum:
return TypeInfoEnumDeclaration.create(t);
case Tfunction:
return TypeInfoFunctionDeclaration.create(t);
case Tdelegate:
return TypeInfoDelegateDeclaration.create(t);
case Ttuple:
return TypeInfoTupleDeclaration.create(t);
case Tclass:
if ((cast(TypeClass)t).sym.isInterfaceDeclaration())
return TypeInfoInterfaceDeclaration.create(t);
else
return TypeInfoClassDeclaration.create(t);
default:
return TypeInfoDeclaration.create(t);
}
}
bool isSpeculativeType(Type t)
{
extern (C++) final class SpeculativeTypeVisitor : Visitor
{
alias visit = Visitor.visit;
public:
bool result;
extern (D) this()
{
}
override void visit(Type t)
{
Type tb = t.toBasetype();
if (tb != t)
tb.accept(this);
}
override void visit(TypeNext t)
{
if (t.next)
t.next.accept(this);
}
override void visit(TypeBasic t)
{
}
override void visit(TypeVector t)
{
t.basetype.accept(this);
}
override void visit(TypeAArray t)
{
t.index.accept(this);
visit(cast(TypeNext)t);
}
override void visit(TypeFunction t)
{
visit(cast(TypeNext)t);
// Currently TypeInfo_Function doesn't store parameter types.
}
override void visit(TypeStruct t)
{
StructDeclaration sd = t.sym;
if (auto ti = sd.isInstantiated())
{
if (!ti.needsCodegen())
{
if (ti.minst || sd.requestTypeInfo)
return;
/* https://issues.dlang.org/show_bug.cgi?id=14425
* TypeInfo_Struct would refer the members of
* struct (e.g. opEquals via xopEquals field), so if it's instantiated
* in speculative context, TypeInfo creation should also be
* stopped to avoid 'unresolved symbol' linker errors.
*/
/* When -debug/-unittest is specified, all of non-root instances are
* automatically changed to speculative, and here is always reached
* from those instantiated non-root structs.
* Therefore, if the TypeInfo is not auctually requested,
* we have to elide its codegen.
*/
result |= true;
return;
}
}
else
{
//assert(!sd.inNonRoot() || sd.requestTypeInfo); // valid?
}
}
override void visit(TypeClass t)
{
ClassDeclaration sd = t.sym;
if (auto ti = sd.isInstantiated())
{
if (!ti.needsCodegen() && !ti.minst)
{
result |= true;
}
}
}
override void visit(TypeTuple t)
{
if (t.arguments)
{
for (size_t i = 0; i < t.arguments.dim; i++)
{
Type tprm = (*t.arguments)[i].type;
if (tprm)
tprm.accept(this);
if (result)
return;
}
}
}
}
scope SpeculativeTypeVisitor v = new SpeculativeTypeVisitor();
t.accept(v);
return v.result;
}
/* ========================================================================= */
/* These decide if there's an instance for them already in std.typeinfo,
* because then the compiler doesn't need to build one.
*/
private bool builtinTypeInfo(Type t)
{
if (t.isTypeBasic() || t.ty == Tclass || t.ty == Tnull)
return !t.mod;
if (t.ty == Tarray)
{
Type next = t.nextOf();
// strings are so common, make them builtin
return !t.mod &&
(next.isTypeBasic() !is null && !next.mod ||
next.ty == Tchar && next.mod == MODFlags.immutable_ ||
next.ty == Tchar && next.mod == MODFlags.const_);
}
return false;
}