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mtype.d
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mtype.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (c) 1999-2017 by Digital Mars, 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: $(DMDSRC _mtype.d)
*/
module ddmd.mtype;
import core.checkedint;
import core.stdc.stdarg;
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import ddmd.access;
import ddmd.aggregate;
import ddmd.aliasthis;
import ddmd.arrayop;
import ddmd.arraytypes;
import ddmd.gluelayer;
import ddmd.complex;
import ddmd.dcast;
import ddmd.dclass;
import ddmd.declaration;
import ddmd.denum;
import ddmd.dimport;
import ddmd.dmangle;
import ddmd.dscope;
import ddmd.dstruct;
import ddmd.dsymbol;
import ddmd.dtemplate;
import ddmd.errors;
import ddmd.expression;
import ddmd.func;
import ddmd.globals;
import ddmd.hdrgen;
import ddmd.id;
import ddmd.identifier;
import ddmd.imphint;
import ddmd.init;
import ddmd.opover;
import ddmd.root.ctfloat;
import ddmd.root.outbuffer;
import ddmd.root.rmem;
import ddmd.root.rootobject;
import ddmd.root.stringtable;
import ddmd.sideeffect;
import ddmd.target;
import ddmd.tokens;
import ddmd.visitor;
enum LOGDOTEXP = 0; // log ::dotExp()
enum LOGDEFAULTINIT = 0; // log ::defaultInit()
extern (C++) __gshared int Tsize_t = Tuns32;
extern (C++) __gshared int Tptrdiff_t = Tint32;
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 & ~MODshared, modto & ~MODshared))
{
case X(0, MODconst):
case X(MODwild, MODconst):
case X(MODwild, MODwildconst):
case X(MODwildconst, MODconst):
return (modfrom & MODshared) == (modto & MODshared);
case X(MODimmutable, MODconst):
case X(MODimmutable, MODwildconst):
return true;
default:
return false;
}
}
/***************************
* Return MATCHexact or MATCHconst 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 MATCHexact;
if (MODimplicitConv(modfrom, modto))
return MATCHconst;
auto X(T, U)(T m, U n)
{
return ((m << 4) | n);
}
switch (X(modfrom, modto))
{
case X(0, MODwild):
case X(MODimmutable, MODwild):
case X(MODconst, MODwild):
case X(MODwildconst, MODwild):
case X(MODshared, MODshared | MODwild):
case X(MODshared | MODimmutable, MODshared | MODwild):
case X(MODshared | MODconst, MODshared | MODwild):
case X(MODshared | MODwildconst, MODshared | MODwild):
return MATCHconst;
default:
return MATCHnomatch;
}
}
/***************************
* 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) & MODshared)
{
// If either type is shared, the result will be shared
result |= MODshared;
mod1 &= ~MODshared;
mod2 &= ~MODshared;
}
if (mod1 == 0 || mod1 == MODmutable || mod1 == MODconst || mod2 == 0 || mod2 == MODmutable || mod2 == MODconst)
{
// If either type is mutable or const, the result will be const.
result |= MODconst;
}
else
{
// MODimmutable vs MODwild
// MODimmutable vs MODwildconst
// MODwild vs MODwildconst
assert(mod1 & MODwild || mod2 & MODwild);
result |= MODwildconst;
}
return result;
}
/*********************************
* Store modifier name into buf.
*/
void MODtoBuffer(OutBuffer* buf, MOD mod)
{
switch (mod)
{
case 0:
break;
case MODimmutable:
buf.writestring(Token.toString(TOKimmutable));
break;
case MODshared:
buf.writestring(Token.toString(TOKshared));
break;
case MODshared | MODconst:
buf.writestring(Token.toString(TOKshared));
buf.writeByte(' ');
goto case; /+ fall through +/
case MODconst:
buf.writestring(Token.toString(TOKconst));
break;
case MODshared | MODwild:
buf.writestring(Token.toString(TOKshared));
buf.writeByte(' ');
goto case; /+ fall through +/
case MODwild:
buf.writestring(Token.toString(TOKwild));
break;
case MODshared | MODwildconst:
buf.writestring(Token.toString(TOKshared));
buf.writeByte(' ');
goto case; /+ fall through +/
case MODwildconst:
buf.writestring(Token.toString(TOKwild));
buf.writeByte(' ');
buf.writestring(Token.toString(TOKconst));
break;
default:
assert(0);
}
}
/*********************************
* Return modifier name.
*/
char* MODtoChars(MOD mod)
{
OutBuffer buf;
buf.reserve(16);
MODtoBuffer(&buf, mod);
return buf.extractString();
}
/************************************
* Convert MODxxxx to STCxxx
*/
StorageClass ModToStc(uint mod) pure nothrow @nogc @safe
{
StorageClass stc = 0;
if (mod & MODimmutable)
stc |= STCimmutable;
if (mod & MODconst)
stc |= STCconst;
if (mod & MODwild)
stc |= STCwild;
if (mod & MODshared)
stc |= STCshared;
return stc;
}
/************************************
* Strip all parameter's idenfiers and their default arguments for merging types.
* If some of parameter types or return type are function pointer, delegate, or
* the types which contains either, then strip also from them.
*/
private Type stripDefaultArgs(Type t)
{
static Parameters* stripParams(Parameters* parameters)
{
Parameters* params = parameters;
if (params && params.dim > 0)
{
foreach (i; 0 .. params.dim)
{
Parameter p = (*params)[i];
Type ta = stripDefaultArgs(p.type);
if (ta != p.type || p.defaultArg || p.ident)
{
if (params == parameters)
{
params = new Parameters();
params.setDim(parameters.dim);
foreach (j; 0 .. params.dim)
(*params)[j] = (*parameters)[j];
}
(*params)[i] = new Parameter(p.storageClass, ta, null, null);
}
}
}
return params;
}
if (t is null)
return t;
if (t.ty == Tfunction)
{
TypeFunction tf = cast(TypeFunction)t;
Type tret = stripDefaultArgs(tf.next);
Parameters* params = stripParams(tf.parameters);
if (tret == tf.next && params == tf.parameters)
goto Lnot;
tf = cast(TypeFunction)tf.copy();
tf.parameters = params;
tf.next = tret;
//printf("strip %s\n <- %s\n", tf.toChars(), t.toChars());
t = tf;
}
else if (t.ty == Ttuple)
{
TypeTuple tt = cast(TypeTuple)t;
Parameters* args = stripParams(tt.arguments);
if (args == tt.arguments)
goto Lnot;
t = t.copy();
(cast(TypeTuple)t).arguments = args;
}
else if (t.ty == Tenum)
{
// TypeEnum::nextOf() may be != NULL, but it's not necessary here.
goto Lnot;
}
else
{
Type tn = t.nextOf();
Type n = stripDefaultArgs(tn);
if (n == tn)
goto Lnot;
t = t.copy();
(cast(TypeNext)t).next = n;
}
//printf("strip %s\n", t.toChars());
Lnot:
return t;
}
enum TFLAGSintegral = 1;
enum TFLAGSfloating = 2;
enum TFLAGSunsigned = 4;
enum TFLAGSreal = 8;
enum TFLAGSimaginary = 0x10;
enum TFLAGScomplex = 0x20;
private Expression semanticLength(Scope* sc, TupleDeclaration tup, Expression exp)
{
ScopeDsymbol sym = new ArrayScopeSymbol(sc, tup);
sym.parent = sc.scopesym;
sc = sc.push(sym);
sc = sc.startCTFE();
exp = exp.semantic(sc);
sc = sc.endCTFE();
sc.pop();
return exp;
}
/**************************
* This evaluates exp while setting length to be the number
* of elements in the tuple t.
*/
private Expression semanticLength(Scope* sc, Type t, Expression exp)
{
if (t.ty == Ttuple)
{
ScopeDsymbol sym = new ArrayScopeSymbol(sc, cast(TypeTuple)t);
sym.parent = sc.scopesym;
sc = sc.push(sym);
sc = sc.startCTFE();
exp = exp.semantic(sc);
sc = sc.endCTFE();
sc.pop();
}
else
{
sc = sc.startCTFE();
exp = exp.semantic(sc);
sc = sc.endCTFE();
}
return exp;
}
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,
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 TMAX = ENUMTY.TMAX;
alias TY = ubyte;
enum MODFlags : int
{
MODconst = 1, // type is const
MODimmutable = 4, // type is immutable
MODshared = 2, // type is shared
MODwild = 8, // type is wild
MODwildconst = (MODwild | MODconst), // type is wild const
MODmutable = 0x10, // type is mutable (only used in wildcard matching)
}
alias MODconst = MODFlags.MODconst;
alias MODimmutable = MODFlags.MODimmutable;
alias MODshared = MODFlags.MODshared;
alias MODwild = MODFlags.MODwild;
alias MODwildconst = MODFlags.MODwildconst;
alias MODmutable = MODFlags.MODmutable;
alias MOD = ubyte;
/***********************************************************
*/
extern (C++) abstract class Type : RootObject
{
TY ty;
MOD mod; // modifiers MODxxxx
char* deco;
/* These are cached values that are lazily evaluated by constOf(), immutableOf(), etc.
* They should not be referenced by anybody but mtype.c.
* They can be NULL if not lazily evaluated yet.
* Note that there is no "shared immutable", because that is just immutable
* Naked == no MOD bits
*/
Type cto; // MODconst ? naked version of this type : const version
Type ito; // MODimmutable ? naked version of this type : immutable version
Type sto; // MODshared ? naked version of this type : shared mutable version
Type scto; // MODshared | MODconst ? naked version of this type : shared const version
Type wto; // MODwild ? naked version of this type : wild version
Type wcto; // MODwildconst ? naked version of this type : wild const version
Type swto; // MODshared | MODwild ? naked version of this type : shared wild version
Type swcto; // MODshared | MODwildconst ? naked version of this type : shared wild const version
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++) static __gshared Type tvoid;
extern (C++) static __gshared Type tint8;
extern (C++) static __gshared Type tuns8;
extern (C++) static __gshared Type tint16;
extern (C++) static __gshared Type tuns16;
extern (C++) static __gshared Type tint32;
extern (C++) static __gshared Type tuns32;
extern (C++) static __gshared Type tint64;
extern (C++) static __gshared Type tuns64;
extern (C++) static __gshared Type tint128;
extern (C++) static __gshared Type tuns128;
extern (C++) static __gshared Type tfloat32;
extern (C++) static __gshared Type tfloat64;
extern (C++) static __gshared Type tfloat80;
extern (C++) static __gshared Type timaginary32;
extern (C++) static __gshared Type timaginary64;
extern (C++) static __gshared Type timaginary80;
extern (C++) static __gshared Type tcomplex32;
extern (C++) static __gshared Type tcomplex64;
extern (C++) static __gshared Type tcomplex80;
extern (C++) static __gshared Type tbool;
extern (C++) static __gshared Type tchar;
extern (C++) static __gshared Type twchar;
extern (C++) static __gshared Type tdchar;
// Some special types
extern (C++) static __gshared Type tshiftcnt;
extern (C++) static __gshared Type tvoidptr; // void*
extern (C++) static __gshared Type tstring; // immutable(char)[]
extern (C++) static __gshared Type twstring; // immutable(wchar)[]
extern (C++) static __gshared Type tdstring; // immutable(dchar)[]
extern (C++) static __gshared Type tvalist; // va_list alias
extern (C++) static __gshared Type terror; // for error recovery
extern (C++) static __gshared Type tnull; // for null type
extern (C++) static __gshared Type tsize_t; // matches size_t alias
extern (C++) static __gshared Type tptrdiff_t; // matches ptrdiff_t alias
extern (C++) static __gshared Type thash_t; // matches hash_t alias
extern (C++) static __gshared ClassDeclaration dtypeinfo;
extern (C++) static __gshared ClassDeclaration typeinfoclass;
extern (C++) static __gshared ClassDeclaration typeinfointerface;
extern (C++) static __gshared ClassDeclaration typeinfostruct;
extern (C++) static __gshared ClassDeclaration typeinfopointer;
extern (C++) static __gshared ClassDeclaration typeinfoarray;
extern (C++) static __gshared ClassDeclaration typeinfostaticarray;
extern (C++) static __gshared ClassDeclaration typeinfoassociativearray;
extern (C++) static __gshared ClassDeclaration typeinfovector;
extern (C++) static __gshared ClassDeclaration typeinfoenum;
extern (C++) static __gshared ClassDeclaration typeinfofunction;
extern (C++) static __gshared ClassDeclaration typeinfodelegate;
extern (C++) static __gshared ClassDeclaration typeinfotypelist;
extern (C++) static __gshared ClassDeclaration typeinfoconst;
extern (C++) static __gshared ClassDeclaration typeinfoinvariant;
extern (C++) static __gshared ClassDeclaration typeinfoshared;
extern (C++) static __gshared ClassDeclaration typeinfowild;
extern (C++) static __gshared TemplateDeclaration rtinfo;
extern (C++) static __gshared Type[TMAX] basic;
extern (C++) static __gshared StringTable stringtable;
extern (C++) static __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);
return sizeTy;
}();
final extern (D) this(TY ty)
{
this.ty = ty;
}
const(char)* kind() const
{
assert(false); // should be overridden
}
final Type copy()
{
Type t = cast(Type)mem.xmalloc(sizeTy[ty]);
memcpy(cast(void*)t, cast(void*)this, sizeTy[ty]);
return t;
}
Type syntaxCopy()
{
print();
fprintf(stderr, "ty = %d\n", ty);
assert(0);
}
override bool equals(RootObject o)
{
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;
}
/*******************************
* Covariant means that 'this' can substitute for 't',
* i.e. a pure function is a match for an impure type.
* 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;
int inoutmismatch = 0;
TypeFunction t1;
TypeFunction t2;
if (equals(t))
return 1; // covariant
if (ty != Tfunction || t.ty != Tfunction)
goto Ldistinct;
t1 = cast(TypeFunction)this;
t2 = cast(TypeFunction)t;
if (t1.varargs != t2.varargs)
goto Ldistinct;
if (t1.parameters && t2.parameters)
{
size_t dim = Parameter.dim(t1.parameters);
if (dim != Parameter.dim(t2.parameters))
goto Ldistinct;
for (size_t i = 0; i < dim; i++)
{
Parameter fparam1 = Parameter.getNth(t1.parameters, i);
Parameter fparam2 = Parameter.getNth(t2.parameters, i);
if (!fparam1.type.equals(fparam2.type))
{
goto Ldistinct;
}
inoutmismatch = !fparam1.isCovariant(t1.isref, fparam2);
}
}
else if (t1.parameters != t2.parameters)
{
size_t dim1 = !t1.parameters ? 0 : t1.parameters.dim;
size_t dim2 = !t2.parameters ? 0 : t2.parameters.dim;
if (dim1 || dim2)
goto Ldistinct;
}
// The argument lists match
if (inoutmismatch)
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._scope)
cd.semantic(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 && t1n.implicitConvTo(t2n) && t1n.size() == t2n.size())
goto Lcovariant;
}
goto Lnotcovariant;
Lcovariant:
if (t1.isref != t2.isref)
goto Lnotcovariant;
if (!t1.isref && (t1.isscope || t2.isscope))
{
StorageClass stc1 = t1.isscope ? STCscope : 0;
StorageClass stc2 = t2.isscope ? STCscope : 0;
if (t1.isreturn)
{
stc1 |= STCreturn;
if (!t1.isscope)
stc1 |= STCref;
}
if (t2.isreturn)
{
stc2 |= STCreturn;
if (!t2.isscope)
stc2 |= STCref;
}
if (!Parameter.isCovariantScope(t1.isref, stc1, stc2))
goto Lnotcovariant;
}
// We can subtract 'return' 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, MODconst)))
stc |= STCconst;
else
goto Lnotcovariant;
}
else
{
goto Ldistinct;
}
}
/* Can convert pure to impure, nothrow to throw, and nogc to gc
*/
if (!t1.purity && t2.purity)
stc |= STCpure;
if (!t1.isnothrow && t2.isnothrow)
stc |= STCnothrow;
if (!t1.isnogc && t2.isnogc)
stc |= STCnogc;
/* Can convert safe/trusted to system
*/
if (t1.trust <= TRUSTsystem && t2.trust >= TRUSTtrusted)
{
// Should we infer trusted or safe? Go with safe.
stc |= STCsafe;
}
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()
{
OutBuffer buf;
buf.reserve(16);
HdrGenState hgs;
hgs.fullQual = (ty == Tclass && !mod);
.toCBuffer(this, &buf, null, &hgs);
return buf.extractString();
}
final char* toPrettyChars(bool QualifyTypes = false)
{
OutBuffer buf;
buf.reserve(16);
HdrGenState hgs;
hgs.fullQual = QualifyTypes;
.toCBuffer(this, &buf, null, &hgs);
return buf.extractString();
}
static void _init()
{
stringtable._init(14000);
// Set basic types
static __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();
tvalist = Target.va_listType();
if (global.params.isLP64)
{
Tsize_t = Tuns64;
Tptrdiff_t = Tint64;
}
else
{
Tsize_t = Tuns32;
Tptrdiff_t = Tint32;
}
tsize_t = basic[Tsize_t];
tptrdiff_t = basic[Tptrdiff_t];
thash_t = tsize_t;
}
final d_uns64 size()
{
return size(Loc());
}
d_uns64 size(Loc loc)
{
error(loc, "no size for type %s", toChars());
return SIZE_INVALID;
}
uint alignsize()
{
return cast(uint)size(Loc());
}
Type semantic(Loc loc, Scope* sc)
{
if (ty == Tint128 || ty == Tuns128)
{
error(loc, "cent and ucent types not implemented");
return terror;
}
return merge();
}
final Type trySemantic(Loc loc, Scope* sc)
{
//printf("+trySemantic(%s) %d\n", toChars(), global.errors);
uint errors = global.startGagging();
Type t = semantic(loc, sc);
if (global.endGagging(errors) || t.ty == Terror) // if any errors happened