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mtype.d
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mtype.d
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/**
* Defines a D type.
*
* Copyright: Copyright (C) 1999-2020 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/mtype.d, _mtype.d)
* Documentation: https://dlang.org/phobos/dmd_mtype.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/mtype.d
*/
module dmd.mtype;
import core.checkedint;
import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.attrib;
import dmd.ast_node;
import dmd.gluelayer;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dmangle;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.expression;
import dmd.expressionsem;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.init;
import dmd.opover;
import dmd.root.ctfloat;
import dmd.root.outbuffer;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.root.stringtable;
import dmd.target;
import dmd.tokens;
import dmd.typesem;
import dmd.visitor;
enum LOGDOTEXP = 0; // log ::dotExp()
enum LOGDEFAULTINIT = 0; // log ::defaultInit()
enum SIZE_INVALID = (~cast(d_uns64)0); // error return from size() functions
/***************************
* Return !=0 if modfrom can be implicitly converted to modto
*/
bool MODimplicitConv(MOD modfrom, MOD modto) pure nothrow @nogc @safe
{
if (modfrom == modto)
return true;
//printf("MODimplicitConv(from = %x, to = %x)\n", modfrom, modto);
auto X(T, U)(T m, U n)
{
return ((m << 4) | n);
}
switch (X(modfrom & ~MODFlags.shared_, modto & ~MODFlags.shared_))
{
case X(0, MODFlags.const_):
case X(MODFlags.wild, MODFlags.const_):
case X(MODFlags.wild, MODFlags.wildconst):
case X(MODFlags.wildconst, MODFlags.const_):
return (modfrom & MODFlags.shared_) == (modto & MODFlags.shared_);
case X(MODFlags.immutable_, MODFlags.const_):
case X(MODFlags.immutable_, MODFlags.wildconst):
return true;
default:
return false;
}
}
/***************************
* Return MATCH.exact or MATCH.constant if a method of type '() modfrom' can call a method of type '() modto'.
*/
MATCH MODmethodConv(MOD modfrom, MOD modto) pure nothrow @nogc @safe
{
if (modfrom == modto)
return MATCH.exact;
if (MODimplicitConv(modfrom, modto))
return MATCH.constant;
auto X(T, U)(T m, U n)
{
return ((m << 4) | n);
}
switch (X(modfrom, modto))
{
case X(0, MODFlags.wild):
case X(MODFlags.immutable_, MODFlags.wild):
case X(MODFlags.const_, MODFlags.wild):
case X(MODFlags.wildconst, MODFlags.wild):
case X(MODFlags.shared_, MODFlags.shared_ | MODFlags.wild):
case X(MODFlags.shared_ | MODFlags.immutable_, MODFlags.shared_ | MODFlags.wild):
case X(MODFlags.shared_ | MODFlags.const_, MODFlags.shared_ | MODFlags.wild):
case X(MODFlags.shared_ | MODFlags.wildconst, MODFlags.shared_ | MODFlags.wild):
return MATCH.constant;
default:
return MATCH.nomatch;
}
}
/***************************
* Merge mod bits to form common mod.
*/
MOD MODmerge(MOD mod1, MOD mod2) pure nothrow @nogc @safe
{
if (mod1 == mod2)
return mod1;
//printf("MODmerge(1 = %x, 2 = %x)\n", mod1, mod2);
MOD result = 0;
if ((mod1 | mod2) & MODFlags.shared_)
{
// If either type is shared, the result will be shared
result |= MODFlags.shared_;
mod1 &= ~MODFlags.shared_;
mod2 &= ~MODFlags.shared_;
}
if (mod1 == 0 || mod1 == MODFlags.mutable || mod1 == MODFlags.const_ || mod2 == 0 || mod2 == MODFlags.mutable || mod2 == MODFlags.const_)
{
// If either type is mutable or const, the result will be const.
result |= MODFlags.const_;
}
else
{
// MODFlags.immutable_ vs MODFlags.wild
// MODFlags.immutable_ vs MODFlags.wildconst
// MODFlags.wild vs MODFlags.wildconst
assert(mod1 & MODFlags.wild || mod2 & MODFlags.wild);
result |= MODFlags.wildconst;
}
return result;
}
/*********************************
* Store modifier name into buf.
*/
void MODtoBuffer(OutBuffer* buf, MOD mod) nothrow
{
buf.writestring(MODtoString(mod));
}
/*********************************
* Returns:
* a human readable representation of `mod`,
* which is the token `mod` corresponds to
*/
const(char)* MODtoChars(MOD mod) nothrow pure
{
/// Works because we return a literal
return MODtoString(mod).ptr;
}
/// Ditto
string MODtoString(MOD mod) nothrow pure
{
final switch (mod)
{
case 0:
return "";
case MODFlags.immutable_:
return "immutable";
case MODFlags.shared_:
return "shared";
case MODFlags.shared_ | MODFlags.const_:
return "shared const";
case MODFlags.const_:
return "const";
case MODFlags.shared_ | MODFlags.wild:
return "shared inout";
case MODFlags.wild:
return "inout";
case MODFlags.shared_ | MODFlags.wildconst:
return "shared inout const";
case MODFlags.wildconst:
return "inout const";
}
}
/************************************
* Convert MODxxxx to STCxxx
*/
StorageClass ModToStc(uint mod) pure nothrow @nogc @safe
{
StorageClass stc = 0;
if (mod & MODFlags.immutable_)
stc |= STC.immutable_;
if (mod & MODFlags.const_)
stc |= STC.const_;
if (mod & MODFlags.wild)
stc |= STC.wild;
if (mod & MODFlags.shared_)
stc |= STC.shared_;
return stc;
}
private enum TFlags
{
integral = 1,
floating = 2,
unsigned = 4,
real_ = 8,
imaginary = 0x10,
complex = 0x20,
}
enum ENUMTY : int
{
Tarray, // slice array, aka T[]
Tsarray, // static array, aka T[dimension]
Taarray, // associative array, aka T[type]
Tpointer,
Treference,
Tfunction,
Tident,
Tclass,
Tstruct,
Tenum,
Tdelegate,
Tnone,
Tvoid,
Tint8,
Tuns8,
Tint16,
Tuns16,
Tint32,
Tuns32,
Tint64,
Tuns64,
Tfloat32,
Tfloat64,
Tfloat80,
Timaginary32,
Timaginary64,
Timaginary80,
Tcomplex32,
Tcomplex64,
Tcomplex80,
Tbool,
Tchar,
Twchar,
Tdchar,
Terror,
Tinstance,
Ttypeof,
Ttuple,
Tslice,
Treturn,
Tnull,
Tvector,
Tint128,
Tuns128,
Ttraits,
Tmixin,
TMAX,
}
alias Tarray = ENUMTY.Tarray;
alias Tsarray = ENUMTY.Tsarray;
alias Taarray = ENUMTY.Taarray;
alias Tpointer = ENUMTY.Tpointer;
alias Treference = ENUMTY.Treference;
alias Tfunction = ENUMTY.Tfunction;
alias Tident = ENUMTY.Tident;
alias Tclass = ENUMTY.Tclass;
alias Tstruct = ENUMTY.Tstruct;
alias Tenum = ENUMTY.Tenum;
alias Tdelegate = ENUMTY.Tdelegate;
alias Tnone = ENUMTY.Tnone;
alias Tvoid = ENUMTY.Tvoid;
alias Tint8 = ENUMTY.Tint8;
alias Tuns8 = ENUMTY.Tuns8;
alias Tint16 = ENUMTY.Tint16;
alias Tuns16 = ENUMTY.Tuns16;
alias Tint32 = ENUMTY.Tint32;
alias Tuns32 = ENUMTY.Tuns32;
alias Tint64 = ENUMTY.Tint64;
alias Tuns64 = ENUMTY.Tuns64;
alias Tfloat32 = ENUMTY.Tfloat32;
alias Tfloat64 = ENUMTY.Tfloat64;
alias Tfloat80 = ENUMTY.Tfloat80;
alias Timaginary32 = ENUMTY.Timaginary32;
alias Timaginary64 = ENUMTY.Timaginary64;
alias Timaginary80 = ENUMTY.Timaginary80;
alias Tcomplex32 = ENUMTY.Tcomplex32;
alias Tcomplex64 = ENUMTY.Tcomplex64;
alias Tcomplex80 = ENUMTY.Tcomplex80;
alias Tbool = ENUMTY.Tbool;
alias Tchar = ENUMTY.Tchar;
alias Twchar = ENUMTY.Twchar;
alias Tdchar = ENUMTY.Tdchar;
alias Terror = ENUMTY.Terror;
alias Tinstance = ENUMTY.Tinstance;
alias Ttypeof = ENUMTY.Ttypeof;
alias Ttuple = ENUMTY.Ttuple;
alias Tslice = ENUMTY.Tslice;
alias Treturn = ENUMTY.Treturn;
alias Tnull = ENUMTY.Tnull;
alias Tvector = ENUMTY.Tvector;
alias Tint128 = ENUMTY.Tint128;
alias Tuns128 = ENUMTY.Tuns128;
alias Ttraits = ENUMTY.Ttraits;
alias Tmixin = ENUMTY.Tmixin;
alias TMAX = ENUMTY.TMAX;
alias TY = ubyte;
///Returns true if ty is char, wchar, or dchar
bool isSomeChar(TY ty) pure nothrow @nogc @safe
{
return ty == Tchar || ty == Twchar || ty == Tdchar;
}
enum MODFlags : int
{
const_ = 1, // type is const
immutable_ = 4, // type is immutable
shared_ = 2, // type is shared
wild = 8, // type is wild
wildconst = (MODFlags.wild | MODFlags.const_), // type is wild const
mutable = 0x10, // type is mutable (only used in wildcard matching)
}
alias MOD = ubyte;
/****************
* dotExp() bit flags
*/
enum DotExpFlag
{
gag = 1, // don't report "not a property" error and just return null
noDeref = 2, // the use of the expression will not attempt a dereference
}
/***************
* Variadic argument lists
* https://dlang.org/spec/function.html#variadic
*/
enum VarArg : ubyte
{
none = 0, /// fixed number of arguments
variadic = 1, /// (T t, ...) can be C-style (core.stdc.stdarg) or D-style (core.vararg)
typesafe = 2, /// (T t ...) typesafe https://dlang.org/spec/function.html#typesafe_variadic_functions
/// or https://dlang.org/spec/function.html#typesafe_variadic_functions
}
/***********************************************************
*/
extern (C++) abstract class Type : ASTNode
{
TY ty;
MOD mod; // modifiers MODxxxx
char* deco;
static struct Mcache
{
/* These are cached values that are lazily evaluated by constOf(), immutableOf(), etc.
* They should not be referenced by anybody but mtype.d.
* They can be null if not lazily evaluated yet.
* Note that there is no "shared immutable", because that is just immutable
* The point of this is to reduce the size of each Type instance as
* we bank on the idea that usually only one of variants exist.
* It will also speed up code because these are rarely referenced and
* so need not be in the cache.
*/
Type cto; // MODFlags.const_
Type ito; // MODFlags.immutable_
Type sto; // MODFlags.shared_
Type scto; // MODFlags.shared_ | MODFlags.const_
Type wto; // MODFlags.wild
Type wcto; // MODFlags.wildconst
Type swto; // MODFlags.shared_ | MODFlags.wild
Type swcto; // MODFlags.shared_ | MODFlags.wildconst
}
private Mcache* mcache;
Type pto; // merged pointer to this type
Type rto; // reference to this type
Type arrayof; // array of this type
TypeInfoDeclaration vtinfo; // TypeInfo object for this Type
type* ctype; // for back end
extern (C++) __gshared Type tvoid;
extern (C++) __gshared Type tint8;
extern (C++) __gshared Type tuns8;
extern (C++) __gshared Type tint16;
extern (C++) __gshared Type tuns16;
extern (C++) __gshared Type tint32;
extern (C++) __gshared Type tuns32;
extern (C++) __gshared Type tint64;
extern (C++) __gshared Type tuns64;
extern (C++) __gshared Type tint128;
extern (C++) __gshared Type tuns128;
extern (C++) __gshared Type tfloat32;
extern (C++) __gshared Type tfloat64;
extern (C++) __gshared Type tfloat80;
extern (C++) __gshared Type timaginary32;
extern (C++) __gshared Type timaginary64;
extern (C++) __gshared Type timaginary80;
extern (C++) __gshared Type tcomplex32;
extern (C++) __gshared Type tcomplex64;
extern (C++) __gshared Type tcomplex80;
extern (C++) __gshared Type tbool;
extern (C++) __gshared Type tchar;
extern (C++) __gshared Type twchar;
extern (C++) __gshared Type tdchar;
// Some special types
extern (C++) __gshared Type tshiftcnt;
extern (C++) __gshared Type tvoidptr; // void*
extern (C++) __gshared Type tstring; // immutable(char)[]
extern (C++) __gshared Type twstring; // immutable(wchar)[]
extern (C++) __gshared Type tdstring; // immutable(dchar)[]
extern (C++) __gshared Type terror; // for error recovery
extern (C++) __gshared Type tnull; // for null type
extern (C++) __gshared Type tsize_t; // matches size_t alias
extern (C++) __gshared Type tptrdiff_t; // matches ptrdiff_t alias
extern (C++) __gshared Type thash_t; // matches hash_t alias
extern (C++) __gshared ClassDeclaration dtypeinfo;
extern (C++) __gshared ClassDeclaration typeinfoclass;
extern (C++) __gshared ClassDeclaration typeinfointerface;
extern (C++) __gshared ClassDeclaration typeinfostruct;
extern (C++) __gshared ClassDeclaration typeinfopointer;
extern (C++) __gshared ClassDeclaration typeinfoarray;
extern (C++) __gshared ClassDeclaration typeinfostaticarray;
extern (C++) __gshared ClassDeclaration typeinfoassociativearray;
extern (C++) __gshared ClassDeclaration typeinfovector;
extern (C++) __gshared ClassDeclaration typeinfoenum;
extern (C++) __gshared ClassDeclaration typeinfofunction;
extern (C++) __gshared ClassDeclaration typeinfodelegate;
extern (C++) __gshared ClassDeclaration typeinfotypelist;
extern (C++) __gshared ClassDeclaration typeinfoconst;
extern (C++) __gshared ClassDeclaration typeinfoinvariant;
extern (C++) __gshared ClassDeclaration typeinfoshared;
extern (C++) __gshared ClassDeclaration typeinfowild;
extern (C++) __gshared TemplateDeclaration rtinfo;
extern (C++) __gshared TemplateDeclaration rttypeid;
extern (C++) __gshared Type[TMAX] basic;
extern (D) __gshared StringTable!Type stringtable;
extern (D) private __gshared ubyte[TMAX] sizeTy = ()
{
ubyte[TMAX] sizeTy = __traits(classInstanceSize, TypeBasic);
sizeTy[Tsarray] = __traits(classInstanceSize, TypeSArray);
sizeTy[Tarray] = __traits(classInstanceSize, TypeDArray);
sizeTy[Taarray] = __traits(classInstanceSize, TypeAArray);
sizeTy[Tpointer] = __traits(classInstanceSize, TypePointer);
sizeTy[Treference] = __traits(classInstanceSize, TypeReference);
sizeTy[Tfunction] = __traits(classInstanceSize, TypeFunction);
sizeTy[Tdelegate] = __traits(classInstanceSize, TypeDelegate);
sizeTy[Tident] = __traits(classInstanceSize, TypeIdentifier);
sizeTy[Tinstance] = __traits(classInstanceSize, TypeInstance);
sizeTy[Ttypeof] = __traits(classInstanceSize, TypeTypeof);
sizeTy[Tenum] = __traits(classInstanceSize, TypeEnum);
sizeTy[Tstruct] = __traits(classInstanceSize, TypeStruct);
sizeTy[Tclass] = __traits(classInstanceSize, TypeClass);
sizeTy[Ttuple] = __traits(classInstanceSize, TypeTuple);
sizeTy[Tslice] = __traits(classInstanceSize, TypeSlice);
sizeTy[Treturn] = __traits(classInstanceSize, TypeReturn);
sizeTy[Terror] = __traits(classInstanceSize, TypeError);
sizeTy[Tnull] = __traits(classInstanceSize, TypeNull);
sizeTy[Tvector] = __traits(classInstanceSize, TypeVector);
sizeTy[Ttraits] = __traits(classInstanceSize, TypeTraits);
sizeTy[Tmixin] = __traits(classInstanceSize, TypeMixin);
return sizeTy;
}();
final extern (D) this(TY ty)
{
this.ty = ty;
}
const(char)* kind() const nothrow pure @nogc @safe
{
assert(false); // should be overridden
}
final Type copy() nothrow const
{
Type t = cast(Type)mem.xmalloc(sizeTy[ty]);
memcpy(cast(void*)t, cast(void*)this, sizeTy[ty]);
return t;
}
Type syntaxCopy()
{
fprintf(stderr, "this = %s, ty = %d\n", toChars(), ty);
assert(0);
}
override bool equals(const RootObject o) const
{
Type t = cast(Type)o;
//printf("Type::equals(%s, %s)\n", toChars(), t.toChars());
// deco strings are unique
// and semantic() has been run
if (this == o || ((t && deco == t.deco) && deco !is null))
{
//printf("deco = '%s', t.deco = '%s'\n", deco, t.deco);
return true;
}
//if (deco && t && t.deco) printf("deco = '%s', t.deco = '%s'\n", deco, t.deco);
return false;
}
final bool equivalent(Type t)
{
return immutableOf().equals(t.immutableOf());
}
// kludge for template.isType()
override final DYNCAST dyncast() const
{
return DYNCAST.type;
}
extern (D)
final Mcache* getMcache()
{
if (!mcache)
mcache = cast(Mcache*) mem.xcalloc(Mcache.sizeof, 1);
return mcache;
}
/*******************************
* Covariant means that 'this' can substitute for 't',
* i.e. a pure function is a match for an impure type.
* Params:
* t = type 'this' is covariant with
* pstc = if not null, store STCxxxx which would make it covariant
* Returns:
* 0 types are distinct
* 1 this is covariant with t
* 2 arguments match as far as overloading goes,
* but types are not covariant
* 3 cannot determine covariance because of forward references
* *pstc STCxxxx which would make it covariant
*/
final int covariant(Type t, StorageClass* pstc = null)
{
version (none)
{
printf("Type::covariant(t = %s) %s\n", t.toChars(), toChars());
printf("deco = %p, %p\n", deco, t.deco);
// printf("ty = %d\n", next.ty);
printf("mod = %x, %x\n", mod, t.mod);
}
if (pstc)
*pstc = 0;
StorageClass stc = 0;
bool notcovariant = false;
if (equals(t))
return 1; // covariant
TypeFunction t1 = this.isTypeFunction();
TypeFunction t2 = t.isTypeFunction();
if (!t1 || !t2)
goto Ldistinct;
if (t1.parameterList.varargs != t2.parameterList.varargs)
goto Ldistinct;
if (t1.parameterList.parameters && t2.parameterList.parameters)
{
if (t1.parameterList.length != t2.parameterList.length)
goto Ldistinct;
foreach (i, fparam1; t1.parameterList)
{
Parameter fparam2 = t2.parameterList[i];
if (!fparam1.type.equals(fparam2.type))
{
Type tp1 = fparam1.type;
Type tp2 = fparam2.type;
if (tp1.ty == tp2.ty)
{
if (auto tc1 = tp1.isTypeClass())
{
if (tc1.sym == (cast(TypeClass)tp2).sym && MODimplicitConv(tp2.mod, tp1.mod))
goto Lcov;
}
else if (auto ts1 = tp1.isTypeStruct())
{
if (ts1.sym == (cast(TypeStruct)tp2).sym && MODimplicitConv(tp2.mod, tp1.mod))
goto Lcov;
}
else if (tp1.ty == Tpointer)
{
if (tp2.implicitConvTo(tp1))
goto Lcov;
}
else if (tp1.ty == Tarray)
{
if (tp2.implicitConvTo(tp1))
goto Lcov;
}
else if (tp1.ty == Tdelegate)
{
if (tp1.implicitConvTo(tp2))
goto Lcov;
}
}
goto Ldistinct;
}
Lcov:
notcovariant |= !fparam1.isCovariant(t1.isref, fparam2);
}
}
else if (t1.parameterList.parameters != t2.parameterList.parameters)
{
if (t1.parameterList.length || t2.parameterList.length)
goto Ldistinct;
}
// The argument lists match
if (notcovariant)
goto Lnotcovariant;
if (t1.linkage != t2.linkage)
goto Lnotcovariant;
{
// Return types
Type t1n = t1.next;
Type t2n = t2.next;
if (!t1n || !t2n) // happens with return type inference
goto Lnotcovariant;
if (t1n.equals(t2n))
goto Lcovariant;
if (t1n.ty == Tclass && t2n.ty == Tclass)
{
/* If same class type, but t2n is const, then it's
* covariant. Do this test first because it can work on
* forward references.
*/
if ((cast(TypeClass)t1n).sym == (cast(TypeClass)t2n).sym && MODimplicitConv(t1n.mod, t2n.mod))
goto Lcovariant;
// If t1n is forward referenced:
ClassDeclaration cd = (cast(TypeClass)t1n).sym;
if (cd.semanticRun < PASS.semanticdone && !cd.isBaseInfoComplete())
cd.dsymbolSemantic(null);
if (!cd.isBaseInfoComplete())
{
return 3; // forward references
}
}
if (t1n.ty == Tstruct && t2n.ty == Tstruct)
{
if ((cast(TypeStruct)t1n).sym == (cast(TypeStruct)t2n).sym && MODimplicitConv(t1n.mod, t2n.mod))
goto Lcovariant;
}
else if (t1n.ty == t2n.ty && t1n.implicitConvTo(t2n))
goto Lcovariant;
else if (t1n.ty == Tnull)
{
// NULL is covariant with any pointer type, but not with any
// dynamic arrays, associative arrays or delegates.
// https://issues.dlang.org/show_bug.cgi?id=8589
// https://issues.dlang.org/show_bug.cgi?id=19618
Type t2bn = t2n.toBasetype();
if (t2bn.ty == Tnull || t2bn.ty == Tpointer || t2bn.ty == Tclass)
goto Lcovariant;
}
}
goto Lnotcovariant;
Lcovariant:
if (t1.isref != t2.isref)
goto Lnotcovariant;
if (!t1.isref && (t1.isScopeQual || t2.isScopeQual))
{
StorageClass stc1 = t1.isScopeQual ? STC.scope_ : 0;
StorageClass stc2 = t2.isScopeQual ? STC.scope_ : 0;
if (t1.isreturn)
{
stc1 |= STC.return_;
if (!t1.isScopeQual)
stc1 |= STC.ref_;
}
if (t2.isreturn)
{
stc2 |= STC.return_;
if (!t2.isScopeQual)
stc2 |= STC.ref_;
}
if (!Parameter.isCovariantScope(t1.isref, stc1, stc2))
goto Lnotcovariant;
}
// We can subtract 'return ref' from 'this', but cannot add it
else if (t1.isreturn && !t2.isreturn)
goto Lnotcovariant;
/* Can convert mutable to const
*/
if (!MODimplicitConv(t2.mod, t1.mod))
{
version (none)
{
//stop attribute inference with const
// If adding 'const' will make it covariant
if (MODimplicitConv(t2.mod, MODmerge(t1.mod, MODFlags.const_)))
stc |= STC.const_;
else
goto Lnotcovariant;
}
else
{
goto Ldistinct;
}
}
/* Can convert pure to impure, nothrow to throw, and nogc to gc
*/
if (!t1.purity && t2.purity)
stc |= STC.pure_;
if (!t1.isnothrow && t2.isnothrow)
stc |= STC.nothrow_;
if (!t1.isnogc && t2.isnogc)
stc |= STC.nogc;
/* Can convert safe/trusted to system
*/
if (t1.trust <= TRUST.system && t2.trust >= TRUST.trusted)
{
// Should we infer trusted or safe? Go with safe.
stc |= STC.safe;
}
if (stc)
{
if (pstc)
*pstc = stc;
goto Lnotcovariant;
}
//printf("\tcovaraint: 1\n");
return 1;
Ldistinct:
//printf("\tcovaraint: 0\n");
return 0;
Lnotcovariant:
//printf("\tcovaraint: 2\n");
return 2;
}
/********************************
* For pretty-printing a type.
*/
final override const(char)* toChars() const
{
OutBuffer buf;
buf.reserve(16);
HdrGenState hgs;
hgs.fullQual = (ty == Tclass && !mod);
.toCBuffer(this, &buf, null, &hgs);
return buf.extractChars();
}
/// ditto
final char* toPrettyChars(bool QualifyTypes = false)
{
OutBuffer buf;
buf.reserve(16);
HdrGenState hgs;
hgs.fullQual = QualifyTypes;
.toCBuffer(this, &buf, null, &hgs);
return buf.extractChars();
}
static void _init()
{
stringtable._init(14_000);
// Set basic types
__gshared TY* basetab =
[
Tvoid,
Tint8,
Tuns8,
Tint16,
Tuns16,
Tint32,
Tuns32,
Tint64,
Tuns64,
Tint128,
Tuns128,
Tfloat32,
Tfloat64,
Tfloat80,
Timaginary32,
Timaginary64,
Timaginary80,
Tcomplex32,
Tcomplex64,
Tcomplex80,
Tbool,
Tchar,
Twchar,
Tdchar,
Terror
];
for (size_t i = 0; basetab[i] != Terror; i++)
{
Type t = new TypeBasic(basetab[i]);
t = t.merge();
basic[basetab[i]] = t;
}
basic[Terror] = new TypeError();
tvoid = basic[Tvoid];
tint8 = basic[Tint8];
tuns8 = basic[Tuns8];
tint16 = basic[Tint16];
tuns16 = basic[Tuns16];
tint32 = basic[Tint32];
tuns32 = basic[Tuns32];
tint64 = basic[Tint64];
tuns64 = basic[Tuns64];
tint128 = basic[Tint128];
tuns128 = basic[Tuns128];
tfloat32 = basic[Tfloat32];
tfloat64 = basic[Tfloat64];
tfloat80 = basic[Tfloat80];
timaginary32 = basic[Timaginary32];
timaginary64 = basic[Timaginary64];
timaginary80 = basic[Timaginary80];
tcomplex32 = basic[Tcomplex32];
tcomplex64 = basic[Tcomplex64];
tcomplex80 = basic[Tcomplex80];
tbool = basic[Tbool];
tchar = basic[Tchar];
twchar = basic[Twchar];
tdchar = basic[Tdchar];
tshiftcnt = tint32;
terror = basic[Terror];
tnull = basic[Tnull];
tnull = new TypeNull();
tnull.deco = tnull.merge().deco;
tvoidptr = tvoid.pointerTo();
tstring = tchar.immutableOf().arrayOf();
twstring = twchar.immutableOf().arrayOf();
tdstring = tdchar.immutableOf().arrayOf();
const isLP64 = global.params.isLP64;
tsize_t = basic[isLP64 ? Tuns64 : Tuns32];
tptrdiff_t = basic[isLP64 ? Tint64 : Tint32];
thash_t = tsize_t;
}
/**
* Deinitializes the global state of the compiler.
*
* This can be used to restore the state set by `_init` to its original
* state.
*/
static void deinitialize()
{
stringtable = stringtable.init;
}
final d_uns64 size()
{
return size(Loc.initial);
}
d_uns64 size(const ref Loc loc)
{
error(loc, "no size for type `%s`", toChars());
return SIZE_INVALID;
}
uint alignsize()
{
return cast(uint)size(Loc.initial);
}
final Type trySemantic(const ref Loc loc, Scope* sc)
{
//printf("+trySemantic(%s) %d\n", toChars(), global.errors);
// Needed to display any deprecations that were gagged
auto tcopy = this.syntaxCopy();
const errors = global.startGagging();
Type t = typeSemantic(this, loc, sc);
if (global.endGagging(errors) || t.ty == Terror) // if any errors happened
{
t = null;
}
else
{
// If `typeSemantic` succeeded, there may have been deprecations that
// were gagged due the the `startGagging` above. Run again to display
// those deprecations. https://issues.dlang.org/show_bug.cgi?id=19107
if (global.gaggedWarnings > 0)
typeSemantic(tcopy, loc, sc);
}
//printf("-trySemantic(%s) %d\n", toChars(), global.errors);
return t;
}
/*************************************
* This version does a merge even if the deco is already computed.
* Necessary for types that have a deco, but are not merged.
*/
final Type merge2()
{
//printf("merge2(%s)\n", toChars());
Type t = this;
assert(t);
if (!t.deco)
return t.merge();
auto sv = stringtable.lookup(t.deco, strlen(t.deco));
if (sv && sv.value)
{
t = sv.value;
assert(t.deco);
}
else
assert(0);
return t;
}
/*********************************
* Store this type's modifier name into buf.
*/
final void modToBuffer(OutBuffer* buf) nothrow const
{
if (mod)
{
buf.writeByte(' ');
MODtoBuffer(buf, mod);
}
}
/*********************************
* Return this type's modifier name.