/
e2ir.d
6482 lines (5745 loc) · 228 KB
/
e2ir.d
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/**
* Converts expressions to Intermediate Representation (IR) for the backend.
*
* 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/e2ir.d, _e2ir.d)
* Documentation: https://dlang.org/phobos/dmd_e2ir.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/e2ir.d
*/
module dmd.e2ir;
import core.stdc.stdio;
import core.stdc.stddef;
import core.stdc.string;
import core.stdc.time;
import dmd.root.array;
import dmd.root.ctfloat;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.root.stringtable;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.attrib;
import dmd.canthrow;
import dmd.ctfeexpr;
import dmd.dclass;
import dmd.declaration;
import dmd.denum;
import dmd.dmodule;
import dmd.dscope;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dtemplate;
import dmd.errors;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.glue;
import dmd.id;
import dmd.init;
import dmd.mtype;
import dmd.objc_glue;
import dmd.s2ir;
import dmd.sideeffect;
import dmd.statement;
import dmd.target;
import dmd.tocsym;
import dmd.toctype;
import dmd.toir;
import dmd.tokens;
import dmd.toobj;
import dmd.typinf;
import dmd.visitor;
import dmd.backend.cc;
import dmd.backend.cdef;
import dmd.backend.cgcv;
import dmd.backend.code;
import dmd.backend.code_x86;
import dmd.backend.cv4;
import dmd.backend.dt;
import dmd.backend.el;
import dmd.backend.global;
import dmd.backend.obj;
import dmd.backend.oper;
import dmd.backend.rtlsym;
import dmd.backend.ty;
import dmd.backend.type;
extern (C++):
alias Elems = Array!(elem *);
alias toSymbol = dmd.tocsym.toSymbol;
alias toSymbol = dmd.glue.toSymbol;
void* mem_malloc2(uint);
@property int REGSIZE() { return _tysize[TYnptr]; }
/* If variable var is a reference
*/
bool ISREF(Declaration var)
{
if (var.isOut() || var.isRef())
{
return true;
}
return ISX64REF(var);
}
/* If variable var of type typ is a reference due to x64 calling conventions
*/
bool ISX64REF(Declaration var)
{
if (var.isOut() || var.isRef())
{
return false;
}
if (var.isParameter())
{
if (config.exe == EX_WIN64)
{
return var.type.size(Loc.initial) > REGSIZE
|| (var.storage_class & STC.lazy_)
|| (var.type.isTypeStruct() && !var.type.isTypeStruct().sym.isPOD());
}
else if (!global.params.isWindows)
{
return !(var.storage_class & STC.lazy_) && var.type.isTypeStruct() && !var.type.isTypeStruct().sym.isPOD();
}
}
return false;
}
/* If variable exp of type typ is a reference due to x64 calling conventions
*/
bool ISX64REF(IRState* irs, Expression exp)
{
if (config.exe == EX_WIN64)
{
return exp.type.size(Loc.initial) > REGSIZE
|| (exp.type.isTypeStruct() && !exp.type.isTypeStruct().sym.isPOD());
}
else if (!irs.params.isWindows)
{
return exp.type.isTypeStruct() && !exp.type.isTypeStruct().sym.isPOD();
}
return false;
}
/******************************************
* If argument to a function should use OPstrpar,
* fix it so it does and return it.
*/
private elem *useOPstrpar(elem *e)
{
tym_t ty = tybasic(e.Ety);
if (ty == TYstruct || ty == TYarray)
{
e = el_una(OPstrpar, TYstruct, e);
e.ET = e.EV.E1.ET;
assert(e.ET);
}
return e;
}
/************************************
* Call a function.
*/
private elem *callfunc(const ref Loc loc,
IRState *irs,
int directcall, // 1: don't do virtual call
Type tret, // return type
elem *ec, // evaluates to function address
Type ectype, // original type of ec
FuncDeclaration fd, // if !=NULL, this is the function being called
Type t, // TypeDelegate or TypeFunction for this function
elem *ehidden, // if !=null, this is the 'hidden' argument
Expressions *arguments,
elem *esel = null, // selector for Objective-C methods (when not provided by fd)
elem *ethis2 = null) // multi-context array
{
elem *ethis = null;
elem *eside = null;
elem *eresult = ehidden;
version (none)
{
printf("callfunc(directcall = %d, tret = '%s', ec = %p, fd = %p)\n",
directcall, tret.toChars(), ec, fd);
printf("ec: "); elem_print(ec);
if (fd)
printf("fd = '%s', vtblIndex = %d, isVirtual() = %d\n", fd.toChars(), fd.vtblIndex, fd.isVirtual());
if (ehidden)
{ printf("ehidden: "); elem_print(ehidden); }
}
t = t.toBasetype();
TypeFunction tf = t.isTypeFunction();
if (!tf)
{
assert(t.ty == Tdelegate);
// A delegate consists of:
// { Object *this; Function *funcptr; }
assert(!fd);
tf = t.nextOf().isTypeFunction();
assert(tf);
ethis = ec;
ec = el_same(ðis);
ethis = el_una(irs.params.is64bit ? OP128_64 : OP64_32, TYnptr, ethis); // get this
ec = array_toPtr(t, ec); // get funcptr
ec = el_una(OPind, totym(tf), ec);
}
const ty = fd ? toSymbol(fd).Stype.Tty : ec.Ety;
const left_to_right = tyrevfunc(ty); // left-to-right parameter evaluation
// (TYnpfunc, TYjfunc, TYfpfunc, TYf16func)
elem* ep = null;
const op = fd ? intrinsic_op(fd) : NotIntrinsic;
if (arguments && arguments.dim)
{
if (op == OPvector)
{
Expression arg = (*arguments)[0];
if (arg.op != TOK.int64)
arg.error("simd operator must be an integer constant, not `%s`", arg.toChars());
}
/* Convert arguments[] to elems[] in left-to-right order
*/
const n = arguments.dim;
debug
elem*[2] elems_array = void;
else
elem*[10] elems_array = void;
import core.stdc.stdlib : malloc, free;
auto pe = (n <= elems_array.length)
? elems_array.ptr
: cast(elem**)Mem.check(malloc(arguments.dim * (elem*).sizeof));
elem*[] elems = pe[0 .. n];
/* Fill elems[] with arguments converted to elems
*/
// j=1 if _arguments[] is first argument
const int j = tf.isDstyleVariadic();
foreach (const i, arg; *arguments)
{
elem *ea = toElem(arg, irs);
//printf("\targ[%d]: %s\n", i, arg.toChars());
if (i - j < tf.parameterList.length &&
i >= j &&
tf.parameterList[i - j].storageClass & (STC.out_ | STC.ref_))
{
/* `ref` and `out` parameters mean convert
* corresponding argument to a pointer
*/
elems[i] = addressElem(ea, arg.type.pointerTo());
continue;
}
if (ISX64REF(irs, arg) && op == NotIntrinsic)
{
/* Copy to a temporary, and make the argument a pointer
* to that temporary.
*/
elems[i] = addressElem(ea, arg.type, true);
continue;
}
if (config.exe == EX_WIN64 && tybasic(ea.Ety) == TYcfloat)
{
/* Treat a cfloat like it was a struct { float re,im; }
*/
ea.Ety = TYllong;
}
elems[i] = ea;
}
if (!left_to_right)
{
/* Avoid 'fixing' side effects of _array... functions as
* they were already working right from the olden days before this fix
*/
if (!(ec.Eoper == OPvar && fd.isArrayOp))
eside = fixArgumentEvaluationOrder(elems);
}
foreach (ref e; elems)
{
e = useOPstrpar(e);
}
if (!left_to_right) // swap order if right-to-left
reverse(elems);
ep = el_params(cast(void**)elems.ptr, cast(int)n);
if (elems.ptr != elems_array.ptr)
free(elems.ptr);
}
objc.setupMethodSelector(fd, &esel);
objc.setupEp(esel, &ep, left_to_right);
const retmethod = retStyle(tf, fd && fd.needThis());
if (retmethod == RET.stack)
{
if (!ehidden)
{
// Don't have one, so create one
type *tc;
Type tret2 = tf.next;
if (tret2.toBasetype().ty == Tstruct ||
tret2.toBasetype().ty == Tsarray)
tc = Type_toCtype(tret2);
else
tc = type_fake(totym(tret2));
Symbol *stmp = symbol_genauto(tc);
ehidden = el_ptr(stmp);
eresult = ehidden;
}
if (target.isPOSIX && tf.linkage != LINK.d)
{
// ehidden goes last on Linux/OSX C++
}
else
{
if (ep)
{
/* // BUG: implement
if (left_to_right && type_mangle(tfunc) == mTYman_cpp)
ep = el_param(ehidden,ep);
else
*/
ep = el_param(ep,ehidden);
}
else
ep = ehidden;
ehidden = null;
}
}
if (fd && fd.isMemberLocal())
{
assert(op == NotIntrinsic); // members should not be intrinsics
AggregateDeclaration ad = fd.isThis();
if (ad)
{
ethis = ec;
if (ad.isStructDeclaration() && tybasic(ec.Ety) != TYnptr)
{
ethis = addressElem(ec, ectype);
}
if (ethis2)
{
ethis2 = setEthis2(loc, irs, fd, ethis2, ðis, &eside);
}
if (el_sideeffect(ethis))
{
elem *ex = ethis;
ethis = el_copytotmp(&ex);
eside = el_combine(ex, eside);
}
}
else
{
// Evaluate ec for side effects
eside = el_combine(ec, eside);
}
Symbol *sfunc = toSymbol(fd);
if (esel)
{
auto result = objc.setupMethodCall(fd, tf, directcall != 0, ec, ehidden, ethis);
ec = result.ec;
ethis = result.ethis;
}
else if (!fd.isVirtual() ||
directcall || // BUG: fix
fd.isFinalFunc()
/* Future optimization: || (whole program analysis && not overridden)
*/
)
{
// make static call
ec = el_var(sfunc);
}
else
{
// make virtual call
assert(ethis);
elem *ev = el_same(ðis);
ev = el_una(OPind, TYnptr, ev);
uint vindex = fd.vtblIndex;
assert(cast(int)vindex >= 0);
// Build *(ev + vindex * 4)
if (!irs.params.is64bit) assert(tysize(TYnptr) == 4);
ec = el_bin(OPadd,TYnptr,ev,el_long(TYsize_t, vindex * tysize(TYnptr)));
ec = el_una(OPind,TYnptr,ec);
ec = el_una(OPind,tybasic(sfunc.Stype.Tty),ec);
}
}
else if (fd && fd.isNested())
{
assert(!ethis);
ethis = getEthis(loc, irs, fd, fd.toParentLocal());
if (ethis2)
ethis2 = setEthis2(loc, irs, fd, ethis2, ðis, &eside);
}
ep = el_param(ep, ethis2 ? ethis2 : ethis);
if (ehidden)
ep = el_param(ep, ehidden); // if ehidden goes last
const tyret = totym(tret);
// Look for intrinsic functions and construct result into e
elem *e;
if (ec.Eoper == OPvar && op != NotIntrinsic)
{
el_free(ec);
if (op != OPtoPrec && OTbinary(op))
{
ep.Eoper = cast(ubyte)op;
ep.Ety = tyret;
e = ep;
if (op == OPeq)
{ /* This was a volatileStore(ptr, value) operation, rewrite as:
* *ptr = value
*/
e.EV.E1 = el_una(OPind, e.EV.E2.Ety | mTYvolatile, e.EV.E1);
}
if (op == OPscale)
{
elem *et = e.EV.E1;
e.EV.E1 = el_una(OPs32_d, TYdouble, e.EV.E2);
e.EV.E1 = el_una(OPd_ld, TYldouble, e.EV.E1);
e.EV.E2 = et;
}
else if (op == OPyl2x || op == OPyl2xp1)
{
elem *et = e.EV.E1;
e.EV.E1 = e.EV.E2;
e.EV.E2 = et;
}
}
else if (op == OPvector)
{
e = ep;
/* Recognize store operations as:
* (op OPparam (op1 OPparam op2))
* Rewrite as:
* (op1 OPvecsto (op OPparam op2))
* A separate operation is used for stores because it
* has a side effect, and so takes a different path through
* the optimizer.
*/
if (e.Eoper == OPparam &&
e.EV.E1.Eoper == OPconst &&
isXMMstore(cast(uint)el_tolong(e.EV.E1)))
{
//printf("OPvecsto\n");
elem *tmp = e.EV.E1;
e.EV.E1 = e.EV.E2.EV.E1;
e.EV.E2.EV.E1 = tmp;
e.Eoper = OPvecsto;
e.Ety = tyret;
}
else
e = el_una(op,tyret,ep);
}
else if (op == OPind)
e = el_una(op,mTYvolatile | tyret,ep);
else if (op == OPva_start && irs.params.is64bit)
{
// (OPparam &va &arg)
// call as (OPva_start &va)
ep.Eoper = cast(ubyte)op;
ep.Ety = tyret;
e = ep;
elem *earg = e.EV.E2;
e.EV.E2 = null;
e = el_combine(earg, e);
}
else if (op == OPtoPrec)
{
static int X(int fty, int tty) { return fty * TMAX + tty; }
final switch (X(tybasic(ep.Ety), tybasic(tyret)))
{
case X(TYfloat, TYfloat): // float -> float
case X(TYdouble, TYdouble): // double -> double
case X(TYldouble, TYldouble): // real -> real
e = ep;
break;
case X(TYfloat, TYdouble): // float -> double
e = el_una(OPf_d, tyret, ep);
break;
case X(TYfloat, TYldouble): // float -> real
e = el_una(OPf_d, TYdouble, ep);
e = el_una(OPd_ld, tyret, e);
break;
case X(TYdouble, TYfloat): // double -> float
e = el_una(OPd_f, tyret, ep);
break;
case X(TYdouble, TYldouble): // double -> real
e = el_una(OPd_ld, tyret, ep);
break;
case X(TYldouble, TYfloat): // real -> float
e = el_una(OPld_d, TYdouble, ep);
e = el_una(OPd_f, tyret, e);
break;
case X(TYldouble, TYdouble): // real -> double
e = el_una(OPld_d, tyret, ep);
break;
}
}
else
e = el_una(op,tyret,ep);
}
else
{
/* Do not do "no side effect" calls if a hidden parameter is passed,
* as the return value is stored through the hidden parameter, which
* is a side effect.
*/
//printf("1: fd = %p prity = %d, nothrow = %d, retmethod = %d, use-assert = %d\n",
// fd, (fd ? fd.isPure() : tf.purity), tf.isnothrow, retmethod, irs.params.useAssert);
//printf("\tfd = %s, tf = %s\n", fd.toChars(), tf.toChars());
/* assert() has 'implicit side effect' so disable this optimization.
*/
int ns = ((fd ? callSideEffectLevel(fd)
: callSideEffectLevel(t)) == 2 &&
retmethod != RET.stack &&
irs.params.useAssert == CHECKENABLE.off && irs.params.optimize);
if (ep)
e = el_bin(ns ? OPcallns : OPcall, tyret, ec, ep);
else
e = el_una(ns ? OPucallns : OPucall, tyret, ec);
if (tf.parameterList.varargs != VarArg.none)
e.Eflags |= EFLAGS_variadic;
}
const isCPPCtor = fd && fd.linkage == LINK.cpp && fd.isCtorDeclaration();
if (isCPPCtor && target.isPOSIX)
{
// CPP constructor returns void on Posix
// https://itanium-cxx-abi.github.io/cxx-abi/abi.html#return-value-ctor
e.Ety = TYvoid;
e = el_combine(e, el_same(ðis));
}
else if (retmethod == RET.stack)
{
if (irs.params.isOSX && eresult)
/* ABI quirk: hidden pointer is not returned in registers
*/
e = el_combine(e, el_copytree(eresult));
e.Ety = TYnptr;
e = el_una(OPind, tyret, e);
}
if (tf.isref)
{
e.Ety = TYnptr;
e = el_una(OPind, tyret, e);
}
if (tybasic(tyret) == TYstruct)
{
e.ET = Type_toCtype(tret);
}
e = el_combine(eside, e);
return e;
}
/**********************************
* D presumes left-to-right argument evaluation, but we're evaluating things
* right-to-left here.
* 1. determine if this matters
* 2. fix it if it does
* Params:
* arguments = function arguments, these will get rewritten in place
* Returns:
* elem that evaluates the side effects
*/
private extern (D) elem *fixArgumentEvaluationOrder(elem*[] elems)
{
/* It matters if all are true:
* 1. at least one argument has side effects
* 2. at least one other argument may depend on side effects
*/
if (elems.length <= 1)
return null;
size_t ifirstside = 0; // index-1 of first side effect
size_t ifirstdep = 0; // index-1 of first dependency on side effect
foreach (i, e; elems)
{
switch (e.Eoper)
{
case OPconst:
case OPrelconst:
case OPstring:
continue;
default:
break;
}
if (el_sideeffect(e))
{
if (!ifirstside)
ifirstside = i + 1;
else if (!ifirstdep)
ifirstdep = i + 1;
}
else
{
if (!ifirstdep)
ifirstdep = i + 1;
}
if (ifirstside && ifirstdep)
break;
}
if (!ifirstdep || !ifirstside)
return null;
/* Now fix by appending side effects and dependencies to eside and replacing
* argument with a temporary.
* Rely on the optimizer removing some unneeded ones using flow analysis.
*/
elem* eside = null;
foreach (i, e; elems)
{
while (e.Eoper == OPcomma)
{
eside = el_combine(eside, e.EV.E1);
e = e.EV.E2;
elems[i] = e;
}
switch (e.Eoper)
{
case OPconst:
case OPrelconst:
case OPstring:
continue;
default:
break;
}
elem *es = e;
elems[i] = el_copytotmp(&es);
eside = el_combine(eside, es);
}
return eside;
}
/*******************************************
* Take address of an elem.
*/
elem *addressElem(elem *e, Type t, bool alwaysCopy = false)
{
//printf("addressElem()\n");
elem **pe;
for (pe = &e; (*pe).Eoper == OPcomma; pe = &(*pe).EV.E2)
{
}
// For conditional operator, both branches need conversion.
if ((*pe).Eoper == OPcond)
{
elem *ec = (*pe).EV.E2;
ec.EV.E1 = addressElem(ec.EV.E1, t, alwaysCopy);
ec.EV.E2 = addressElem(ec.EV.E2, t, alwaysCopy);
(*pe).Ejty = (*pe).Ety = cast(ubyte)ec.EV.E1.Ety;
(*pe).ET = ec.EV.E1.ET;
e.Ety = TYnptr;
return e;
}
if (alwaysCopy || ((*pe).Eoper != OPvar && (*pe).Eoper != OPind))
{
elem *e2 = *pe;
type *tx;
// Convert to ((tmp=e2),tmp)
TY ty;
if (t && ((ty = t.toBasetype().ty) == Tstruct || ty == Tsarray))
tx = Type_toCtype(t);
else if (tybasic(e2.Ety) == TYstruct)
{
assert(t); // don't know of a case where this can be null
tx = Type_toCtype(t);
}
else
tx = type_fake(e2.Ety);
Symbol *stmp = symbol_genauto(tx);
elem *eeq = elAssign(el_var(stmp), e2, t, tx);
*pe = el_bin(OPcomma,e2.Ety,eeq,el_var(stmp));
}
tym_t typ = TYnptr;
if (e.Eoper == OPind && tybasic(e.EV.E1.Ety) == TYimmutPtr)
typ = TYimmutPtr;
e = el_una(OPaddr,typ,e);
return e;
}
/***************************************
* Return `true` if elem is a an lvalue.
* Lvalue elems are OPvar and OPind.
*/
bool elemIsLvalue(elem* e)
{
while (e.Eoper == OPcomma || e.Eoper == OPinfo)
e = e.EV.E2;
// For conditional operator, both branches need to be lvalues.
if (e.Eoper == OPcond)
{
elem* ec = e.EV.E2;
return elemIsLvalue(ec.EV.E1) && elemIsLvalue(ec.EV.E2);
}
return e.Eoper == OPvar || e.Eoper == OPind;
}
/*****************************************
* Convert array to a pointer to the data.
* Params:
* t = array type
* e = array to convert, it is "consumed" by the function
* Returns:
* e rebuilt into a pointer to the data
*/
elem *array_toPtr(Type t, elem *e)
{
//printf("array_toPtr()\n");
//elem_print(e);
t = t.toBasetype();
switch (t.ty)
{
case Tpointer:
break;
case Tarray:
case Tdelegate:
if (e.Eoper == OPcomma)
{
e.Ety = TYnptr;
e.EV.E2 = array_toPtr(t, e.EV.E2);
}
else if (e.Eoper == OPpair)
{
if (el_sideeffect(e.EV.E1))
{
e.Eoper = OPcomma;
e.Ety = TYnptr;
}
else
{
auto r = e;
e = e.EV.E2;
e.Ety = TYnptr;
r.EV.E2 = null;
el_free(r);
}
}
else
{
version (all)
e = el_una(OPmsw, TYnptr, e);
else
{
e = el_una(OPaddr, TYnptr, e);
e = el_bin(OPadd, TYnptr, e, el_long(TYsize_t, 4));
e = el_una(OPind, TYnptr, e);
}
}
break;
case Tsarray:
//e = el_una(OPaddr, TYnptr, e);
e = addressElem(e, t);
break;
default:
printf("%s\n", t.toChars());
assert(0);
}
return e;
}
/*****************************************
* Convert array to a dynamic array.
*/
elem *array_toDarray(Type t, elem *e)
{
uint dim;
elem *ef = null;
elem *ex;
//printf("array_toDarray(t = %s)\n", t.toChars());
//elem_print(e);
t = t.toBasetype();
switch (t.ty)
{
case Tarray:
break;
case Tsarray:
e = addressElem(e, t);
dim = cast(uint)(cast(TypeSArray)t).dim.toInteger();
e = el_pair(TYdarray, el_long(TYsize_t, dim), e);
break;
default:
L1:
switch (e.Eoper)
{
case OPconst:
{
size_t len = tysize(e.Ety);
elem *es = el_calloc();
es.Eoper = OPstring;
// freed in el_free
es.EV.Vstring = cast(char*)mem_malloc2(cast(uint)len);
memcpy(es.EV.Vstring, &e.EV, len);
es.EV.Vstrlen = len;
es.Ety = TYnptr;
e = es;
break;
}
case OPvar:
e = el_una(OPaddr, TYnptr, e);
break;
case OPcomma:
ef = el_combine(ef, e.EV.E1);
ex = e;
e = e.EV.E2;
ex.EV.E1 = null;
ex.EV.E2 = null;
el_free(ex);
goto L1;
case OPind:
ex = e;
e = e.EV.E1;
ex.EV.E1 = null;
ex.EV.E2 = null;
el_free(ex);
break;
default:
{
// Copy expression to a variable and take the
// address of that variable.
e = addressElem(e, t);
break;
}
}
dim = 1;
e = el_pair(TYdarray, el_long(TYsize_t, dim), e);
break;
}
return el_combine(ef, e);
}
/************************************
*/
elem *sarray_toDarray(const ref Loc loc, Type tfrom, Type tto, elem *e)
{
//printf("sarray_toDarray()\n");
//elem_print(e);
dinteger_t dim = (cast(TypeSArray)tfrom).dim.toInteger();
if (tto)
{
uint fsize = cast(uint)tfrom.nextOf().size();
uint tsize = cast(uint)tto.nextOf().size();
if ((dim * fsize) % tsize != 0)
{
// have to change to Internal Compiler Error?
error(loc, "cannot cast %s to %s since sizes don't line up", tfrom.toChars(), tto.toChars());
}
dim = (dim * fsize) / tsize;
}
elem *elen = el_long(TYsize_t, dim);
e = addressElem(e, tfrom);
e = el_pair(TYdarray, elen, e);
return e;
}
/************************************
*/
elem *getTypeInfo(Loc loc, Type t, IRState *irs)
{
assert(t.ty != Terror);
genTypeInfo(loc, t, null);
elem *e = el_ptr(toSymbol(t.vtinfo));
return e;
}
/********************************************
* Determine if t is a struct that has postblit.
*/
StructDeclaration needsPostblit(Type t)
{
if (auto ts = t.baseElemOf().isTypeStruct())
{
StructDeclaration sd = ts.sym;
if (sd.postblit)
return sd;
}
return null;
}
/********************************************
* Determine if t is a struct that has destructor.
*/
StructDeclaration needsDtor(Type t)
{
if (auto ts = t.baseElemOf().isTypeStruct())
{
StructDeclaration sd = ts.sym;
if (sd.dtor)
return sd;
}
return null;
}
/*******************************************
* Set an array pointed to by eptr to evalue:
* eptr[0..edim] = evalue;
* Params:
* exp = the expression for which this operation is performed
* eptr = where to write the data to
* edim = number of times to write evalue to eptr[]
* tb = type of evalue
* evalue = value to write
* irs = context
* op = TOK.blit, TOK.assign, or TOK.construct
* Returns:
* created IR code
*/
private elem *setArray(Expression exp, elem *eptr, elem *edim, Type tb, elem *evalue, IRState *irs, int op)
{
assert(op == TOK.blit || op == TOK.assign || op == TOK.construct);
const sz = cast(uint)tb.size();
Lagain:
int r;
switch (tb.ty)
{
case Tfloat80:
case Timaginary80:
r = RTLSYM_MEMSET80;
break;
case Tcomplex80:
r = RTLSYM_MEMSET160;
break;
case Tcomplex64:
r = RTLSYM_MEMSET128;
break;
case Tfloat32:
case Timaginary32:
if (!irs.params.is64bit)
goto default; // legacy binary compatibility
r = RTLSYM_MEMSETFLOAT;
break;
case Tfloat64:
case Timaginary64:
if (!irs.params.is64bit)
goto default; // legacy binary compatibility
r = RTLSYM_MEMSETDOUBLE;