/
e2ir.c
5705 lines (5055 loc) · 203 KB
/
e2ir.c
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/* Compiler implementation of the D programming language
* Copyright (c) 1999-2014 by Digital Mars
* All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/e2ir.c
*/
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "port.h"
#include "target.h"
#include "expression.h"
#include "mtype.h"
#include "dsymbol.h"
#include "declaration.h"
#include "enum.h"
#include "aggregate.h"
#include "attrib.h"
#include "module.h"
#include "init.h"
#include "template.h"
#include "mem.h" // for tk/mem_malloc
#include "cc.h"
#include "el.h"
#include "oper.h"
#include "global.h"
#include "code.h"
#include "type.h"
#include "dt.h"
#include "irstate.h"
#include "id.h"
#include "type.h"
#include "toir.h"
#include "ctfe.h"
typedef Array<elem *> Elems;
elem *addressElem(elem *e, Type *t, bool alwaysCopy = false);
elem *array_toPtr(Type *t, elem *e);
VarDeclarations *VarDeclarations_create();
type *Type_toCtype(Type *t);
elem *toElemDtor(Expression *e, IRState *irs);
unsigned totym(Type *tx);
Symbol *toSymbol(Dsymbol *s);
elem *toElem(Expression *e, IRState *irs);
dt_t **Expression_toDt(Expression *e, dt_t **pdt);
Symbol *toStringSymbol(const char *str, size_t len, size_t sz);
void toObjFile(Dsymbol *ds, bool multiobj);
Symbol *toModuleAssert(Module *m);
Symbol *toModuleUnittest(Module *m);
Symbol *toModuleArray(Module *m);
Symbol *toImport(Dsymbol *ds);
Symbol *toInitializer(AggregateDeclaration *ad);
Symbol *aaGetSymbol(TypeAArray *taa, const char *func, int flags);
Symbol* toSymbol(StructLiteralExp *sle);
Symbol* toSymbol(ClassReferenceExp *cre);
elem *filelinefunction(IRState *irs, Expression *e);
void toTraceGC(IRState *irs, elem *e, Loc *loc);
void genTypeInfo(Type *t, Scope *sc);
int callSideEffectLevel(FuncDeclaration *f);
int callSideEffectLevel(Type *t);
void objc_callfunc_setupMethodSelector(Type *tret, FuncDeclaration *fd, Type *t, elem *ehidden, elem **esel);
void objc_callfunc_setupMethodCall(elem **ec, elem *ehidden, elem *ethis, TypeFunction *tf);
void objc_callfunc_setupEp(elem *esel, elem **ep, int reverse);
#define el_setLoc(e,loc) ((e)->Esrcpos.Sfilename = (char *)(loc).filename, \
(e)->Esrcpos.Slinnum = (loc).linnum, \
(e)->Esrcpos.Scharnum = (loc).charnum)
/* If variable var of type typ is a reference
*/
bool ISREF(Declaration *var, Type *tb)
{
return (var->isParameter() && config.exe == EX_WIN64 && (var->type->size(Loc()) > REGSIZE || var->storage_class & STClazy))
|| var->isOut() || var->isRef();
}
/* If variable var of type typ is a reference due to Win64 calling conventions
*/
bool ISWIN64REF(Declaration *var)
{
return (config.exe == EX_WIN64 && var->isParameter() &&
(var->type->size(Loc()) > REGSIZE || var->storage_class & STClazy)) &&
!(var->isOut() || var->isRef());
}
/******************************************
* If argument to a function should use OPstrpar,
* fix it so it does and return it.
*/
elem *useOPstrpar(elem *e)
{
tym_t ty = tybasic(e->Ety);
if (ty == TYstruct || ty == TYarray)
{
e = el_una(OPstrpar, TYstruct, e);
e->ET = e->E1->ET;
assert(e->ET);
}
return e;
}
/************************************
* Call a function.
*/
elem *callfunc(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 *ep;
elem *e;
elem *ethis = NULL;
elem *eside = NULL;
tym_t ty;
tym_t tyret;
RET retmethod;
int reverse;
TypeFunction *tf;
int op;
elem *eresult = ehidden;
#if 0
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); }
#endif
t = t->toBasetype();
if (t->ty == Tdelegate)
{
// A delegate consists of:
// { Object *this; Function *funcptr; }
assert(!fd);
assert(t->nextOf()->ty == Tfunction);
tf = (TypeFunction *)(t->nextOf());
ethis = ec;
ec = el_same(ðis);
ethis = el_una(I64 ? OP128_64 : OP64_32, TYnptr, ethis); // get this
ec = array_toPtr(t, ec); // get funcptr
ec = el_una(OPind, totym(tf), ec);
}
else
{
assert(t->ty == Tfunction);
tf = (TypeFunction *)(t);
}
retmethod = retStyle(tf);
ty = ec->Ety;
if (fd)
ty = toSymbol(fd)->Stype->Tty;
reverse = tyrevfunc(ty);
ep = NULL;
op = fd ? intrinsic_op(fd) : -1;
if (arguments)
{
for (size_t i = 0; i < arguments->dim; i++)
{
Lagain:
Expression *arg = (*arguments)[i];
assert(arg->op != TOKtuple);
if (arg->op == TOKcomma)
{
CommaExp *ce = (CommaExp *)arg;
eside = el_combine(eside, toElem(ce->e1, irs));
(*arguments)[i] = ce->e2;
goto Lagain;
}
}
// j=1 if _arguments[] is first argument
int j = (tf->linkage == LINKd && tf->varargs == 1);
for (size_t i = 0; i < arguments->dim ; i++)
{
Expression *arg = (*arguments)[i];
elem *ea;
//printf("\targ[%d]: %s\n", i, arg->toChars());
size_t nparams = Parameter::dim(tf->parameters);
if (i - j < nparams && i >= j)
{
Parameter *p = Parameter::getNth(tf->parameters, i - j);
if (p->storageClass & (STCout | STCref))
{
// Convert argument to a pointer
ea = toElem(arg, irs);
ea = addressElem(ea, arg->type->pointerTo());
goto L1;
}
}
if (config.exe == EX_WIN64 && arg->type->size(arg->loc) > REGSIZE && op == -1)
{
/* Copy to a temporary, and make the argument a pointer
* to that temporary.
*/
ea = toElem(arg, irs);
ea = addressElem(ea, arg->type, true);
goto L1;
}
ea = toElem(arg, irs);
if (config.exe == EX_WIN64 && tybasic(ea->Ety) == TYcfloat)
{
/* Treat a cfloat like it was a struct { float re,im; }
*/
ea->Ety = TYllong;
}
L1:
ea = useOPstrpar(ea);
if (reverse)
ep = el_param(ep,ea);
else
ep = el_param(ea,ep);
}
}
objc_callfunc_setupMethodSelector(tret, fd, t, ehidden, &esel);
objc_callfunc_setupEp(esel, &ep, reverse);
if (retmethod == RETstack)
{
if (!ehidden)
{
// Don't have one, so create one
type *tc;
Type *tret = tf->next;
if (tret->toBasetype()->ty == Tstruct ||
tret->toBasetype()->ty == Tsarray)
tc = Type_toCtype(tret);
else
tc = type_fake(totym(tret));
Symbol *stmp = symbol_genauto(tc);
ehidden = el_ptr(stmp);
eresult = ehidden;
}
if ((global.params.isLinux ||
global.params.isOSX ||
global.params.isFreeBSD ||
global.params.isSolaris) && tf->linkage != LINKd)
; // ehidden goes last on Linux/OSX C++
else
{
if (ep)
{
#if 0 // BUG: implement
if (reverse && type_mangle(tfunc) == mTYman_cpp)
ep = el_param(ehidden,ep);
else
#endif
ep = el_param(ep,ehidden);
}
else
ep = ehidden;
ehidden = NULL;
}
}
if (fd && fd->isMember2())
{
assert(op == -1); // members should not be intrinsics
AggregateDeclaration *ad = fd->isThis();
if (ad)
{
ethis = ec;
if (ad->isStructDeclaration() && tybasic(ec->Ety) != TYnptr)
{
ethis = addressElem(ec, ectype);
}
}
else
{
// Evaluate ec for side effects
eside = el_combine(ec, eside);
}
Symbol *sfunc = toSymbol(fd);
if (esel)
{
objc_callfunc_setupMethodCall(&ec, ehidden, ethis, tf);
}
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);
unsigned vindex = fd->vtblIndex;
assert((int)vindex >= 0);
// Build *(ev + vindex * 4)
if (I32) 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);
}
ep = el_param(ep, ethis);
if (ehidden)
ep = el_param(ep, ehidden); // if ehidden goes last
tyret = totym(tret);
// Look for intrinsic functions
if (ec->Eoper == OPvar && op != -1)
{
el_free(ec);
if (OTbinary(op))
{
ep->Eoper = op;
ep->Ety = tyret;
e = ep;
if (op == OPeq)
{ /* This was a volatileStore(ptr, value) operation, rewrite as:
* *ptr = value
*/
e->E1 = el_una(OPind, e->E2->Ety | mTYvolatile, e->E1);
}
if (op == OPscale)
{
elem *et = e->E1;
e->E1 = el_una(OPs32_d, TYdouble, e->E2);
e->E1 = el_una(OPd_ld, TYldouble, e->E1);
e->E2 = et;
}
else if (op == OPyl2x || op == OPyl2xp1)
{
elem *et = e->E1;
e->E1 = e->E2;
e->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->E1->Eoper == OPparam &&
e->E1->E1->Eoper == OPconst &&
isXMMstore(el_tolong(e->E1->E1)))
{
//printf("OPvecsto\n");
elem *tmp = e->E2;
e->E2 = e->E1;
e->E1 = e->E2->E2;
e->E2->E2 = 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 && global.params.is64bit)
{
assert(I64);
// (OPparam &va &arg)
// call as (OPva_start &va)
ep->Eoper = op;
ep->Ety = tyret;
e = ep;
elem *earg = e->E2;
e->E2 = NULL;
e = el_combine(earg, e);
}
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, global.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 != RETstack &&
!global.params.useAssert && global.params.optimize);
if (ep)
e = el_bin(ns ? OPcallns : OPcall, tyret, ec, ep);
else
e = el_una(ns ? OPucallns : OPucall, tyret, ec);
if (tf->varargs)
e->Eflags |= EFLAGS_variadic;
}
if (retmethod == RETstack)
{
if (global.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;
}
/*******************************************
* Take address of an elem.
*/
elem *addressElem(elem *e, Type *t, bool alwaysCopy)
{
//printf("addressElem()\n");
elem **pe;
for (pe = &e; (*pe)->Eoper == OPcomma; pe = &(*pe)->E2)
;
// For conditional operator, both branches need conversion.
if ((*pe)->Eoper == OPcond)
{
elem *ec = (*pe)->E2;
ec->E1 = addressElem(ec->E1, t, alwaysCopy);
ec->E2 = addressElem(ec->E2, t, alwaysCopy);
(*pe)->Ejty = (*pe)->Ety = ec->E1->Ety;
(*pe)->ET = ec->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 = el_bin(OPeq,e2->Ety,el_var(stmp),e2);
if (tybasic(e2->Ety) == TYstruct)
{
eeq->Eoper = OPstreq;
eeq->ET = e2->ET;
}
else if (tybasic(e2->Ety) == TYarray)
{
eeq->Eoper = OPstreq;
eeq->Ejty = eeq->Ety = TYstruct;
eeq->ET = t ? Type_toCtype(t) : tx;
}
*pe = el_bin(OPcomma,e2->Ety,eeq,el_var(stmp));
}
e = el_una(OPaddr,TYnptr,e);
return e;
}
/*****************************************
* Convert array to 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->E2 = array_toPtr(t, e->E2);
}
else if (e->Eoper == OPpair)
{
e->Eoper = OPcomma;
e->Ety = TYnptr;
}
else
{
#if 1
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);
#endif
}
break;
case Tsarray:
//e = el_una(OPaddr, TYnptr, e);
e = addressElem(e, t);
break;
default:
t->print();
assert(0);
}
return e;
}
/*****************************************
* Convert array to a dynamic array.
*/
elem *array_toDarray(Type *t, elem *e)
{
unsigned 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 = ((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[tybasic(e->Ety)];
elem *es = el_calloc();
es->Eoper = OPstring;
// freed in el_free
es->EV.ss.Vstring = (char *)mem_malloc(len);
memcpy(es->EV.ss.Vstring, &e->EV, len);
es->EV.ss.Vstrlen = len;
es->Ety = TYnptr;
e = es;
break;
}
case OPvar:
e = el_una(OPaddr, TYnptr, e);
break;
case OPcomma:
ef = el_combine(ef, e->E1);
ex = e;
e = e->E2;
ex->E1 = NULL;
ex->E2 = NULL;
el_free(ex);
goto L1;
case OPind:
ex = e;
e = e->E1;
ex->E1 = NULL;
ex->E2 = NULL;
el_free(ex);
break;
default:
{
// Copy expression to a variable and take the
// address of that variable.
Symbol *stmp;
tym_t ty = tybasic(e->Ety);
if (ty == TYstruct)
{ unsigned sz = type_size(e->ET);
if (sz <= 4)
ty = TYint;
else if (sz <= 8)
ty = TYllong;
else if (sz <= 16)
ty = TYcent;
}
e->Ety = ty;
stmp = symbol_genauto(type_fake(ty));
e = el_bin(OPeq, e->Ety, el_var(stmp), e);
e = el_bin(OPcomma, TYnptr, e, el_una(OPaddr, TYnptr, el_var(stmp)));
break;
}
}
dim = 1;
e = el_pair(TYdarray, el_long(TYsize_t, dim), e);
break;
}
return el_combine(ef, e);
}
/************************************
*/
elem *sarray_toDarray(Loc loc, Type *tfrom, Type *tto, elem *e)
{
//printf("sarray_toDarray()\n");
//elem_print(e);
dinteger_t dim = ((TypeSArray *)tfrom)->dim->toInteger();
if (tto)
{
unsigned fsize = tfrom->nextOf()->size();
unsigned tsize = 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(Type *t, IRState *irs)
{
assert(t->ty != Terror);
genTypeInfo(t, NULL);
elem *e = el_ptr(toSymbol(t->vtinfo));
return e;
}
/********************************************
* Determine if t is a struct that has postblit.
*/
StructDeclaration *needsPostblit(Type *t)
{
t = t->baseElemOf();
if (t->ty == Tstruct)
{
StructDeclaration *sd = ((TypeStruct *)t)->sym;
if (sd->postblit)
return sd;
}
return NULL;
}
/********************************************
* Determine if t is a struct that has destructor.
*/
StructDeclaration *needsDtor(Type *t)
{
t = t->baseElemOf();
if (t->ty == Tstruct)
{
StructDeclaration *sd = ((TypeStruct *)t)->sym;
if (sd->dtor)
return sd;
}
return NULL;
}
/*******************************************
* Set an array pointed to by eptr to evalue:
* eptr[0..edim] = evalue;
* Input:
* eptr where to write the data to
* evalue value to write
* edim number of times to write evalue to eptr[]
* tb type of evalue
*/
elem *setArray(elem *eptr, elem *edim, Type *tb, elem *evalue, IRState *irs, int op)
{
int r;
elem *e;
unsigned sz = tb->size();
Lagain:
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 (I32)
goto Ldefault; // legacy binary compatibility
r = RTLSYM_MEMSETFLOAT;
break;
case Tfloat64:
case Timaginary64:
if (I32)
goto Ldefault; // legacy binary compatibility
r = RTLSYM_MEMSETDOUBLE;
break;
case Tstruct:
{
if (I32)
goto Ldefault;
TypeStruct *tc = (TypeStruct *)tb;
StructDeclaration *sd = tc->sym;
if (sd->arg1type && !sd->arg2type)
{
tb = sd->arg1type;
goto Lagain;
}
goto Ldefault;
}
case Tvector:
r = RTLSYM_MEMSETSIMD;
break;
default:
Ldefault:
switch (sz)
{
case 1: r = RTLSYM_MEMSET8; break;
case 2: r = RTLSYM_MEMSET16; break;
case 4: r = RTLSYM_MEMSET32; break;
case 8: r = RTLSYM_MEMSET64; break;
case 16: r = I64 ? RTLSYM_MEMSET128ii : RTLSYM_MEMSET128; break;
default: r = RTLSYM_MEMSETN; break;
}
/* Determine if we need to do postblit
*/
if (op != TOKblit)
{
if (needsPostblit(tb) || needsDtor(tb))
{
/* Need to do postblit/destructor.
* void *_d_arraysetassign(void *p, void *value, int dim, TypeInfo ti);
*/
r = (op == TOKconstruct) ? RTLSYM_ARRAYSETCTOR : RTLSYM_ARRAYSETASSIGN;
evalue = el_una(OPaddr, TYnptr, evalue);
// This is a hack so we can call postblits on const/immutable objects.
elem *eti = getTypeInfo(tb->unSharedOf()->mutableOf(), irs);
e = el_params(eti, edim, evalue, eptr, NULL);
e = el_bin(OPcall,TYnptr,el_var(getRtlsym(r)),e);
return e;
}
}
if (I64 && tybasic(evalue->Ety) == TYstruct && r != RTLSYM_MEMSETN)
{
/* If this struct is in-memory only, i.e. cannot necessarily be passed as
* a gp register parameter.
* The trouble is that memset() is expecting the argument to be in a gp
* register, but the argument pusher may have other ideas on I64.
* MEMSETN is inefficient, though.
*/
if (tybasic(evalue->ET->Tty) == TYstruct)
{
type *t1 = evalue->ET->Ttag->Sstruct->Sarg1type;
type *t2 = evalue->ET->Ttag->Sstruct->Sarg2type;
if (!t1 && !t2)
{
if (config.exe != EX_WIN64 || sz > 8)
r = RTLSYM_MEMSETN;
}
else if (config.exe != EX_WIN64 &&
r == RTLSYM_MEMSET128ii &&
t1->Tty == TYdouble &&
t2->Tty == TYdouble)
r = RTLSYM_MEMSET128;
}
}
if (r == RTLSYM_MEMSETN)
{
// void *_memsetn(void *p, void *value, int dim, int sizelem)
evalue = el_una(OPaddr, TYnptr, evalue);
elem *esz = el_long(TYsize_t, sz);
e = el_params(esz, edim, evalue, eptr, NULL);
e = el_bin(OPcall,TYnptr,el_var(getRtlsym(r)),e);
return e;
}
break;
}
if (sz > 1 && sz <= 8 &&
evalue->Eoper == OPconst && el_allbits(evalue, 0))
{
r = RTLSYM_MEMSET8;
edim = el_bin(OPmul, TYsize_t, edim, el_long(TYsize_t, sz));
}
if (config.exe == EX_WIN64 && sz > REGSIZE)
{
evalue = addressElem(evalue, tb);
}
evalue = useOPstrpar(evalue);
// Be careful about parameter side effect ordering
if (r == RTLSYM_MEMSET8)
{
e = el_param(edim, evalue);
e = el_bin(OPmemset,TYnptr,eptr,e);
}
else
{
e = el_params(edim, evalue, eptr, NULL);
e = el_bin(OPcall,TYnptr,el_var(getRtlsym(r)),e);
}
return e;
}
StringTable *stringTab;
/********************************
* Reset stringTab[] between object files being emitted, because the symbols are local.
*/
void clearStringTab()
{
//printf("clearStringTab()\n");
if (stringTab)
stringTab->reset(1000); // 1000 is arbitrary guess
else
{
stringTab = new StringTable();
stringTab->_init(1000);
}
}
elem *toElem(Expression *e, IRState *irs)
{
class ToElemVisitor : public Visitor
{
public:
IRState *irs;
elem *result;
ToElemVisitor(IRState *irs)
: irs(irs)
{
result = NULL;
}
/***************************************
*/
void visit(Expression *e)
{
printf("[%s] %s ", e->loc.toChars(), Token::toChars(e->op));
e->print();
assert(0);
result = NULL;
}
/************************************
*/
void visit(SymbolExp *se)
{
elem *e;
tym_t tym;
Type *tb = (se->op == TOKsymoff) ? se->var->type->toBasetype() : se->type->toBasetype();
int offset = (se->op == TOKsymoff) ? ((SymOffExp*)se)->offset : 0;
VarDeclaration *v = se->var->isVarDeclaration();
//printf("[%s] SymbolExp::toElem('%s') %p, %s\n", se->loc.toChars(), se->toChars(), se, se->type->toChars());
//printf("\tparent = '%s'\n", se->var->parent ? se->var->parent->toChars() : "null");
if (se->op == TOKvar && se->var->needThis())
{
se->error("need 'this' to access member %s", se->toChars());
result = el_long(TYsize_t, 0);
return;
}
/* The magic variable __ctfe is always false at runtime
*/
if (se->op == TOKvar && v && v->ident == Id::ctfe)
{
result = el_long(totym(se->type), 0);
return;
}
Symbol *s = toSymbol(se->var);
FuncDeclaration *fd = NULL;
if (se->var->toParent2())
fd = se->var->toParent2()->isFuncDeclaration();
int nrvo = 0;
if (fd && fd->nrvo_can && fd->nrvo_var == se->var)
{
s = fd->shidden;
nrvo = 1;
}
if (s->Sclass == SCauto || s->Sclass == SCparameter || s->Sclass == SCshadowreg)
{
if (fd && fd != irs->getFunc())
{
// 'var' is a variable in an enclosing function.
elem *ethis = getEthis(se->loc, irs, fd);
ethis = el_una(OPaddr, TYnptr, ethis);
/* Bugzilla 9383: If 's' is a virtual function parameter
* placed in closure, and actually accessed from in/out
* contract, instead look at the original stack data.
*/
bool forceStackAccess = false;
if (s->Sclass == SCparameter &&
fd->isVirtual() && (fd->fdrequire || fd->fdensure))
{
Dsymbol *sx = irs->getFunc();
while (sx != fd)
{