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/**
* Semantic analysis of template parameters.
*
* 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/templateparamsem.d, _templateparamsem.d)
* Documentation: https://dlang.org/phobos/dmd_templateparamsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/templateparamsem.d
*/
module dmd.templateparamsem;
import dmd.arraytypes;
import dmd.dsymbol;
import dmd.dscope;
import dmd.dtemplate;
import dmd.globals;
import dmd.expression;
import dmd.expressionsem;
import dmd.root.rootobject;
import dmd.mtype;
import dmd.typesem;
import dmd.visitor;
/************************************************
* Performs semantic on TemplateParameter AST nodes.
*
* Params:
* tp = element of `parameters` to be semantically analyzed
* sc = context
* parameters = array of `TemplateParameters` supplied to the `TemplateDeclaration`
* Returns:
* `true` if no errors
*/
extern(C++) bool tpsemantic(TemplateParameter tp, Scope* sc, TemplateParameters* parameters)
{
scope v = new TemplateParameterSemanticVisitor(sc, parameters);
tp.accept(v);
return v.result;
}
private extern (C++) final class TemplateParameterSemanticVisitor : Visitor
{
alias visit = Visitor.visit;
Scope* sc;
TemplateParameters* parameters;
bool result;
this(Scope* sc, TemplateParameters* parameters)
{
this.sc = sc;
this.parameters = parameters;
}
override void visit(TemplateTypeParameter ttp)
{
//printf("TemplateTypeParameter.semantic('%s')\n", ident.toChars());
if (ttp.specType && !reliesOnTident(ttp.specType, parameters))
{
ttp.specType = ttp.specType.typeSemantic(ttp.loc, sc);
}
version (none)
{
// Don't do semantic() until instantiation
if (ttp.defaultType)
{
ttp.defaultType = ttp.defaultType.typeSemantic(ttp.loc, sc);
}
}
result = !(ttp.specType && isError(ttp.specType));
}
override void visit(TemplateValueParameter tvp)
{
tvp.valType = tvp.valType.typeSemantic(tvp.loc, sc);
version (none)
{
// defer semantic analysis to arg match
if (tvp.specValue)
{
Expression e = tvp.specValue;
sc = sc.startCTFE();
e = e.semantic(sc);
sc = sc.endCTFE();
e = e.implicitCastTo(sc, tvp.valType);
e = e.ctfeInterpret();
if (e.op == EXP.int64 || e.op == EXP.float64 ||
e.op == EXP.complex80 || e.op == EXP.null_ || e.op == EXP.string_)
tvp.specValue = e;
}
if (tvp.defaultValue)
{
Expression e = defaultValue;
sc = sc.startCTFE();
e = e.semantic(sc);
sc = sc.endCTFE();
e = e.implicitCastTo(sc, tvp.valType);
e = e.ctfeInterpret();
if (e.op == EXP.int64)
tvp.defaultValue = e;
}
}
result = !isError(tvp.valType);
}
override void visit(TemplateAliasParameter tap)
{
if (tap.specType && !reliesOnTident(tap.specType, parameters))
{
tap.specType = tap.specType.typeSemantic(tap.loc, sc);
}
tap.specAlias = aliasParameterSemantic(tap.loc, sc, tap.specAlias, parameters);
version (none)
{
// Don't do semantic() until instantiation
if (tap.defaultAlias)
tap.defaultAlias = tap.defaultAlias.semantic(tap.loc, sc);
}
result = !(tap.specType && isError(tap.specType)) && !(tap.specAlias && isError(tap.specAlias));
}
override void visit(TemplateTupleParameter ttp)
{
result = true;
}
}
/***********************************************
* Support function for performing semantic analysis on `TemplateAliasParameter`.
*
* Params:
* loc = location (for error messages)
* sc = context
* o = object to run semantic() on, the `TemplateAliasParameter`s `specAlias` or `defaultAlias`
* parameters = array of `TemplateParameters` supplied to the `TemplateDeclaration`
* Returns:
* object resulting from running `semantic` on `o`
*/
RootObject aliasParameterSemantic(Loc loc, Scope* sc, RootObject o, TemplateParameters* parameters)
{
if (!o)
return null;
Expression ea = isExpression(o);
RootObject eaCTFE()
{
sc = sc.startCTFE();
ea = ea.expressionSemantic(sc);
sc = sc.endCTFE();
return ea.ctfeInterpret();
}
Type ta = isType(o);
if (ta && (!parameters || !reliesOnTident(ta, parameters)))
{
Dsymbol s = ta.toDsymbol(sc);
if (s)
return s;
else if (TypeInstance ti = ta.isTypeInstance())
{
Type t;
const errors = global.errors;
ta.resolve(loc, sc, ea, t, s);
// if we had an error evaluating the symbol, suppress further errors
if (!t && errors != global.errors)
return Type.terror;
// We might have something that looks like a type
// but is actually an expression or a dsymbol
// see https://issues.dlang.org/show_bug.cgi?id=16472
if (t)
return t.typeSemantic(loc, sc);
else if (ea)
{
return eaCTFE();
}
else if (s)
return s;
else
assert(0);
}
else
return ta.typeSemantic(loc, sc);
}
else if (ea)
return eaCTFE();
return o;
}
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