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glocal.d
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glocal.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1993-1998 by Symantec
* Copyright (C) 2000-2019 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/backend/glocal.d, backend/glocal.d)
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/backend/glocal.d
*/
module dmd.backend.glocal;
version (SCPP)
version = COMPILE;
version (MARS)
version = COMPILE;
version (COMPILE)
{
import core.stdc.stdio;
import core.stdc.stdlib;
import core.stdc.string;
import core.stdc.time;
import dmd.backend.cc;
import dmd.backend.cdef;
import dmd.backend.code_x86;
import dmd.backend.oper;
import dmd.backend.global;
import dmd.backend.goh;
import dmd.backend.el;
import dmd.backend.ty;
import dmd.backend.type;
import dmd.backend.barray;
import dmd.backend.dlist;
import dmd.backend.dvec;
extern (C++):
nothrow:
int REGSIZE();
enum
{
LFvolatile = 1, // contains volatile or shared refs or defs
LFambigref = 2, // references ambiguous data
LFambigdef = 4, // defines ambiguous data
LFsymref = 8, // reference to symbol s
LFsymdef = 0x10, // definition of symbol s
LFunambigref = 0x20, // references unambiguous data other than s
LFunambigdef = 0x40, // defines unambiguous data other than s
LFinp = 0x80, // input from I/O port
LFoutp = 0x100, // output to I/O port
LFfloat = 0x200, // sets float flags and/or depends on
// floating point settings
}
struct loc_t
{
elem *e;
int flags; // LFxxxxx
}
///////////////////////////////
// This optimization attempts to replace sequences like:
// x = func();
// y = 3;
// z = x + 5;
// with:
// y = 3;
// z = (x = func()) + 5;
// In other words, we attempt to localize expressions by moving them
// as near as we can to where they are used. This should minimize
// temporary generation and register usage.
void localize()
{
if (debugc) printf("localize()\n");
__gshared Barray!(loc_t) loctab; // cache the array so it usually won't need reallocating
// Table should not get any larger than the symbol table
loctab.setLength(globsym.symmax);
foreach (b; BlockRange(startblock)) // for each block
{
loctab.setLength(0); // start over for each block
if (b.Belem &&
/* Overly broad way to account for the case:
* try
* { i++;
* foo(); // throws exception
* i++; // shouldn't combine previous i++ with this one
* }
*/
!b.Btry)
{
local_exp(loctab,b.Belem,0);
}
}
}
//////////////////////////////////////
// Input:
// goal !=0 if we want the result of the expression
//
private void local_exp(ref Barray!loc_t lt, elem *e, int goal)
{
Symbol *s;
elem *e1;
OPER op1;
Loop:
elem_debug(e);
const op = e.Eoper;
switch (op)
{
case OPcomma:
local_exp(lt,e.EV.E1,0);
e = e.EV.E2;
goto Loop;
case OPandand:
case OPoror:
local_exp(lt,e.EV.E1,1);
lt.setLength(0); // we can do better than this, fix later
break;
case OPcolon:
case OPcolon2:
lt.setLength(0); // we can do better than this, fix later
break;
case OPinfo:
if (e.EV.E1.Eoper == OPmark)
{ lt.setLength(0);
e = e.EV.E2;
goto Loop;
}
goto case_bin;
case OPdtor:
case OPctor:
case OPdctor:
lt.setLength(0); // don't move expressions across ctor/dtor
break; // boundaries, it would goof up EH cleanup
case OPddtor:
lt.setLength(0); // don't move expressions across ctor/dtor
// boundaries, it would goof up EH cleanup
local_exp(lt,e.EV.E1,0);
lt.setLength(0);
break;
case OPeq:
case OPstreq:
e1 = e.EV.E1;
local_exp(lt,e.EV.E2,1);
if (e1.Eoper == OPvar)
{ s = e1.EV.Vsym;
if (s.Sflags & SFLunambig)
{ local_symdef(lt, s);
if (!goal)
local_ins(lt, e);
}
else
local_ambigdef(lt);
}
else
{
assert(!OTleaf(e1.Eoper));
local_exp(lt,e1.EV.E1,1);
if (OTbinary(e1.Eoper))
local_exp(lt,e1.EV.E2,1);
local_ambigdef(lt);
}
break;
case OPpostinc:
case OPpostdec:
case OPaddass:
case OPminass:
case OPmulass:
case OPdivass:
case OPmodass:
case OPashrass:
case OPshrass:
case OPshlass:
case OPandass:
case OPxorass:
case OPorass:
case OPcmpxchg:
if (ERTOL(e))
{ local_exp(lt,e.EV.E2,1);
case OPnegass:
e1 = e.EV.E1;
op1 = e1.Eoper;
if (op1 != OPvar)
{
local_exp(lt,e1.EV.E1,1);
if (OTbinary(op1))
local_exp(lt,e1.EV.E2,1);
}
else if (lt.length && (op == OPaddass || op == OPxorass))
{
s = e1.EV.Vsym;
for (uint u = 0; u < lt.length; u++)
{ elem *em;
em = lt[u].e;
if (em.Eoper == op &&
em.EV.E1.EV.Vsym == s &&
tysize(em.Ety) == tysize(e1.Ety) &&
!tyfloating(em.Ety) &&
em.EV.E1.EV.Voffset == e1.EV.Voffset &&
!el_sideeffect(em.EV.E2)
)
{ // Change (x += a),(x += b) to
// (x + a),(x += a + b)
go.changes++;
e.EV.E2 = el_bin(opeqtoop(op),e.EV.E2.Ety,em.EV.E2,e.EV.E2);
em.Eoper = cast(ubyte)opeqtoop(op);
em.EV.E2 = el_copytree(em.EV.E2);
local_rem(lt, u);
debug if (debugc)
{ printf("Combined equation ");
WReqn(e);
printf(";\n");
e = doptelem(e,GOALvalue);
}
break;
}
}
}
}
else
{
e1 = e.EV.E1;
op1 = e1.Eoper;
if (op1 != OPvar)
{
local_exp(lt,e1.EV.E1,1);
if (OTbinary(op1))
local_exp(lt,e1.EV.E2,1);
}
if (lt.length)
{ if (op1 == OPvar &&
((s = e1.EV.Vsym).Sflags & SFLunambig))
local_symref(lt, s);
else
local_ambigref(lt);
}
local_exp(lt,e.EV.E2,1);
}
if (op1 == OPvar &&
((s = e1.EV.Vsym).Sflags & SFLunambig))
{ local_symref(lt, s);
local_symdef(lt, s);
if (op == OPaddass || op == OPxorass)
local_ins(lt, e);
}
else if (lt.length)
{
local_remove(lt, LFambigdef | LFambigref);
}
break;
case OPstrlen:
case OPind:
local_exp(lt,e.EV.E1,1);
local_ambigref(lt);
break;
case OPstrcmp:
case OPmemcmp:
case OPbt:
local_exp(lt,e.EV.E1,1);
local_exp(lt,e.EV.E2,1);
local_ambigref(lt);
break;
case OPstrcpy:
case OPmemcpy:
case OPstrcat:
case OPcall:
case OPcallns:
local_exp(lt,e.EV.E2,1);
local_exp(lt,e.EV.E1,1);
goto Lrd;
case OPstrctor:
case OPucall:
case OPucallns:
local_exp(lt,e.EV.E1,1);
goto Lrd;
case OPbtc:
case OPbtr:
case OPbts:
local_exp(lt,e.EV.E1,1);
local_exp(lt,e.EV.E2,1);
goto Lrd;
case OPasm:
Lrd:
local_remove(lt, LFfloat | LFambigref | LFambigdef);
break;
case OPmemset:
local_exp(lt,e.EV.E2,1);
if (e.EV.E1.Eoper == OPvar)
{
/* Don't want to rearrange (p = get(); p memset 0;)
* as elemxxx() will rearrange it back.
*/
s = e.EV.E1.EV.Vsym;
if (s.Sflags & SFLunambig)
local_symref(lt, s);
else
local_ambigref(lt); // ambiguous reference
}
else
local_exp(lt,e.EV.E1,1);
local_ambigdef(lt);
break;
case OPvar:
s = e.EV.Vsym;
if (lt.length)
{
// If potential candidate for replacement
if (s.Sflags & SFLunambig)
{
foreach (const u; 0 .. lt.length)
{
auto em = lt[u].e;
if (em.EV.E1.EV.Vsym == s &&
(em.Eoper == OPeq || em.Eoper == OPstreq))
{
if (tysize(em.Ety) == tysize(e.Ety) &&
em.EV.E1.EV.Voffset == e.EV.Voffset &&
((tyfloating(em.Ety) != 0) == (tyfloating(e.Ety) != 0) ||
/** Hack to fix https://issues.dlang.org/show_bug.cgi?id=10226
* Recognize assignments of float vectors to void16, as used by
* core.simd intrinsics. The backend type for void16 is Tschar16!
*/
(tyvector(em.Ety) != 0) == (tyvector(e.Ety) != 0) && tybasic(e.Ety) == TYschar16) &&
/* Changing the Ety to a OPvecfill node means we're potentially generating
* wrong code.
* Ref: https://issues.dlang.org/show_bug.cgi?id=18034
*/
(em.EV.E2.Eoper != OPvecfill || tybasic(e.Ety) == tybasic(em.Ety)) &&
!local_preserveAssignmentTo(em.EV.E1.Ety))
{
debug if (debugc)
{ printf("Moved equation ");
WReqn(em);
printf(";\n");
}
go.changes++;
em.Ety = e.Ety;
el_copy(e,em);
em.EV.E1 = em.EV.E2 = null;
em.Eoper = OPconst;
}
local_rem(lt, u);
break;
}
}
local_symref(lt, s);
}
else
local_ambigref(lt); // ambiguous reference
}
break;
case OPremquo:
if (e.EV.E1.Eoper != OPvar)
goto case_bin;
s = e.EV.E1.EV.Vsym;
if (lt.length)
{
if (s.Sflags & SFLunambig)
local_symref(lt, s);
else
local_ambigref(lt); // ambiguous reference
}
goal = 1;
e = e.EV.E2;
goto Loop;
default:
if (OTcommut(e.Eoper))
{ // Since commutative operators may get their leaves
// swapped, we eliminate any that may be affected by that.
for (uint u = 0; u < lt.length;)
{
const f = lt[u].flags;
elem* eu = lt[u].e;
s = eu.EV.E1.EV.Vsym;
const f1 = local_getflags(e.EV.E1,s);
const f2 = local_getflags(e.EV.E2,s);
if (f1 & f2 & LFsymref || // if both reference or
(f1 | f2) & LFsymdef || // either define
f & LFambigref && (f1 | f2) & LFambigdef ||
f & LFambigdef && (f1 | f2) & (LFambigref | LFambigdef)
)
local_rem(lt, u);
else if (f & LFunambigdef && local_chkrem(e,eu.EV.E2))
local_rem(lt, u);
else
u++;
}
}
if (OTunary(e.Eoper))
{ goal = 1;
e = e.EV.E1;
goto Loop;
}
case_bin:
if (OTbinary(e.Eoper))
{ local_exp(lt,e.EV.E1,1);
goal = 1;
e = e.EV.E2;
goto Loop;
}
break;
} // end of switch (e.Eoper)
}
///////////////////////////////////
// Examine expression tree eu to see if it defines any variables
// that e refs or defs.
// Note that e is a binary operator.
// Returns:
// true if it does
private bool local_chkrem(elem *e,elem *eu)
{
while (1)
{
elem_debug(eu);
const op = eu.Eoper;
if (OTassign(op) && eu.EV.E1.Eoper == OPvar)
{
auto s = eu.EV.E1.EV.Vsym;
const f1 = local_getflags(e.EV.E1,s);
const f2 = local_getflags(e.EV.E2,s);
if ((f1 | f2) & (LFsymref | LFsymdef)) // if either reference or define
return true;
}
if (OTbinary(op))
{
if (local_chkrem(e,eu.EV.E2))
return true;
}
else if (!OTunary(op))
break; // leaf node
eu = eu.EV.E1;
}
return false;
}
//////////////////////////////////////
// Add entry e to lt[]
private void local_ins(ref Barray!loc_t lt, elem *e)
{
elem_debug(e);
if (e.EV.E1.Eoper == OPvar)
{
auto s = e.EV.E1.EV.Vsym;
symbol_debug(s);
if (s.Sflags & SFLunambig) // if can only be referenced directly
{
const flags = local_getflags(e.EV.E2,null);
if (!(flags & (LFvolatile | LFinp | LFoutp)) &&
!(e.EV.E1.Ety & (mTYvolatile | mTYshared)))
{
// Add e to the candidate array
//printf("local_ins('%s'), loctop = %d\n",s.Sident.ptr,lt.length);
lt.push(loc_t(e, flags));
}
}
}
}
//////////////////////////////////////
// Remove entry i from lt[], and then compress the table.
//
private void local_rem(ref Barray!loc_t lt, size_t u)
{
//printf("local_rem(%u)\n",u);
lt.remove(u);
}
//////////////////////////////////////
// Analyze and gather LFxxxx flags about expression e and symbol s.
private int local_getflags(elem *e,Symbol *s)
{
elem_debug(e);
if (s)
symbol_debug(s);
int flags = 0;
while (1)
{
if (e.Ety & (mTYvolatile | mTYshared))
flags |= LFvolatile;
switch (e.Eoper)
{
case OPeq:
case OPstreq:
if (e.EV.E1.Eoper == OPvar)
{
auto s1 = e.EV.E1.EV.Vsym;
if (s1.Sflags & SFLunambig)
flags |= (s1 == s) ? LFsymdef : LFunambigdef;
else
flags |= LFambigdef;
}
else
flags |= LFambigdef;
goto L1;
case OPpostinc:
case OPpostdec:
case OPaddass:
case OPminass:
case OPmulass:
case OPdivass:
case OPmodass:
case OPashrass:
case OPshrass:
case OPshlass:
case OPandass:
case OPxorass:
case OPorass:
case OPcmpxchg:
if (e.EV.E1.Eoper == OPvar)
{
auto s1 = e.EV.E1.EV.Vsym;
if (s1.Sflags & SFLunambig)
flags |= (s1 == s) ? LFsymdef | LFsymref
: LFunambigdef | LFunambigref;
else
flags |= LFambigdef | LFambigref;
}
else
flags |= LFambigdef | LFambigref;
L1:
flags |= local_getflags(e.EV.E2,s);
e = e.EV.E1;
break;
case OPucall:
case OPucallns:
case OPcall:
case OPcallns:
case OPstrcat:
case OPstrcpy:
case OPmemcpy:
case OPbtc:
case OPbtr:
case OPbts:
case OPstrctor:
flags |= LFambigref | LFambigdef;
break;
case OPmemset:
flags |= LFambigdef;
break;
case OPvar:
if (e.EV.Vsym == s)
flags |= LFsymref;
else if (!(e.EV.Vsym.Sflags & SFLunambig))
flags |= LFambigref;
break;
case OPind:
case OPstrlen:
case OPstrcmp:
case OPmemcmp:
case OPbt:
flags |= LFambigref;
break;
case OPinp:
flags |= LFinp;
break;
case OPoutp:
flags |= LFoutp;
break;
default:
break;
}
if (OTunary(e.Eoper))
{
if (tyfloating(e.Ety))
flags |= LFfloat;
e = e.EV.E1;
}
else if (OTbinary(e.Eoper))
{
if (tyfloating(e.Ety))
flags |= LFfloat;
flags |= local_getflags(e.EV.E2,s);
e = e.EV.E1;
}
else
break;
}
return flags;
}
//////////////////////////////////////
// Remove all entries with flags set.
//
private void local_remove(ref Barray!loc_t lt, int flags)
{
for (uint u = 0; u < lt.length;)
{
if (lt[u].flags & flags)
local_rem(lt, u);
else
++u;
}
}
//////////////////////////////////////
// Ambiguous reference. Remove all with ambiguous defs
//
private void local_ambigref(ref Barray!loc_t lt)
{
local_remove(lt, LFambigdef);
}
//////////////////////////////////////
// Ambiguous definition. Remove all with ambiguous refs.
//
private void local_ambigdef(ref Barray!loc_t lt)
{
local_remove(lt, LFambigref | LFambigdef);
}
//////////////////////////////////////
// Reference to symbol.
// Remove any that define that symbol.
private void local_symref(ref Barray!loc_t lt, Symbol *s)
{
symbol_debug(s);
for (uint u = 0; u < lt.length;)
{
if (local_getflags(lt[u].e,s) & LFsymdef)
local_rem(lt, u);
else
++u;
}
}
//////////////////////////////////////
// Definition of symbol.
// Remove any that reference that symbol.
private void local_symdef(ref Barray!loc_t lt, Symbol *s)
{
symbol_debug(s);
for (uint u = 0; u < lt.length;)
{
if (local_getflags(lt[u].e,s) & (LFsymref | LFsymdef))
local_rem(lt, u);
else
++u;
}
}
/***************************************************
* See if we should preserve assignment to Symbol of type ty.
* Returns:
* true if preserve assignment
* References:
* https://issues.dlang.org/show_bug.cgi?id=13474
*/
private bool local_preserveAssignmentTo(tym_t ty)
{
/* Need to preserve assignment if generating code using
* the x87, as that is the only way to get the x87 to
* convert to float/double precision.
*/
if (config.inline8087 && !config.fpxmmregs)
{
switch (tybasic(ty))
{
case TYfloat:
case TYifloat:
case TYcfloat:
case TYdouble:
case TYidouble:
case TYdouble_alias:
case TYcdouble:
return true;
default:
break;
}
}
return false;
}
}