/
dout.d
1285 lines (1148 loc) · 36 KB
/
dout.d
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/**
* Transition from intermediate representation to code generator
*
* Compiler implementation of the
* $(LINK2 https://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1984-1998 by Symantec
* Copyright (C) 2000-2024 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/backend/out.d, backend/out.d)
*/
module dmd.backend.dout;
import core.stdc.stdio;
import core.stdc.string;
import dmd.backend.barray;
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.dlist;
import dmd.backend.mem;
import dmd.backend.el;
import dmd.backend.global;
import dmd.backend.goh;
import dmd.backend.inliner;
import dmd.backend.obj;
import dmd.backend.oper;
import dmd.backend.rtlsym;
import dmd.backend.symtab;
import dmd.backend.ty;
import dmd.backend.type;
nothrow:
@safe:
// Determine if this Symbol is stored in a COMDAT
@trusted
bool symbol_iscomdat2(Symbol* s)
{
return s.Sclass == SC.comdat ||
config.flags2 & CFG2comdat && s.Sclass == SC.inline ||
config.flags4 & CFG4allcomdat && s.Sclass == SC.global;
}
/***********************************
* Output function thunk.
*/
@trusted
extern (C) void outthunk(Symbol *sthunk,Symbol *sfunc,uint p,tym_t thisty,
targ_size_t d,int i,targ_size_t d2)
{
sthunk.Sseg = cseg;
cod3_thunk(sthunk,sfunc,p,thisty,cast(uint)d,i,cast(uint)d2);
sthunk.Sfunc.Fflags &= ~Fpending;
sthunk.Sfunc.Fflags |= Foutput; /* mark it as having been output */
}
/***************************
* Write out statically allocated data.
* Input:
* s symbol to be initialized
*/
@trusted
void outdata(Symbol *s)
{
int seg;
targ_size_t offset;
int flags;
const int codeseg = cseg;
symbol_debug(s);
debug
debugy && printf("outdata('%s')\n",s.Sident.ptr);
//printf("outdata('%s', ty=x%x)\n",s.Sident.ptr,s.Stype.Tty);
//symbol_print(s);
// Data segment variables are always live on exit from a function
s.Sflags |= SFLlivexit;
dt_t *dtstart = s.Sdt;
s.Sdt = null; // it will be free'd
targ_size_t datasize = 0;
tym_t ty = s.ty();
if (ty & mTYexport && config.wflags & WFexpdef && s.Sclass != SC.static_)
objmod.export_symbol(s,0); // export data definition
for (dt_t *dt = dtstart; dt; dt = dt.DTnext)
{
//printf("\tdt = %p, dt = %d\n",dt,dt.dt);
switch (dt.dt)
{ case DT_abytes:
{ // Put out the data for the string, and
// reserve a spot for a pointer to that string
datasize += size(dt.Dty); // reserve spot for pointer to string
if (tybasic(dt.Dty) == TYcptr)
{ dt.DTseg = codeseg;
dt.DTabytes += Offset(codeseg);
goto L1;
}
else if (tybasic(dt.Dty) == TYfptr &&
dt.DTnbytes > config.threshold)
{
L1:
objmod.write_bytes(SegData[dt.DTseg],dt.DTpbytes[0 .. dt.DTnbytes]);
break;
}
else
{
alignOffset(CDATA, 1 << dt.DTalign);
dt.DTabytes += objmod.data_readonly(cast(char*)dt.DTpbytes,dt.DTnbytes,&dt.DTseg);
}
break;
}
case DT_ibytes:
datasize += dt.DTn;
break;
case DT_nbytes:
//printf("DT_nbytes %d\n", dt.DTnbytes);
datasize += dt.DTnbytes;
break;
case DT_azeros:
/* A block of zeros
*/
//printf("DT_azeros %d\n", dt.DTazeros);
datasize += dt.DTazeros;
if (dt == dtstart && !dt.DTnext && s.Sclass != SC.comdat &&
(s.Sseg == UNKNOWN || s.Sseg <= UDATA))
{ /* first and only, so put in BSS segment
*/
switch (ty & mTYLINK)
{
case mTYcs:
s.Sseg = codeseg;
Offset(codeseg) = _align(datasize,Offset(codeseg));
s.Soffset = Offset(codeseg);
Offset(codeseg) += datasize;
s.Sfl = FLcsdata;
break;
case mTYthreadData:
assert(config.objfmt == OBJ_MACH && I64);
goto case;
case mTYthread:
{ seg_data *pseg = objmod.tlsseg_bss();
s.Sseg = pseg.SDseg;
objmod.data_start(s, datasize, pseg.SDseg);
if (config.objfmt == OBJ_OMF)
pseg.SDoffset += datasize;
else
objmod.lidata(pseg.SDseg, pseg.SDoffset, datasize);
s.Sfl = FLtlsdata;
break;
}
default:
s.Sseg = UDATA;
objmod.data_start(s,datasize,UDATA);
objmod.lidata(s.Sseg,s.Soffset,datasize);
s.Sfl = FLudata; // uninitialized data
break;
}
assert(s.Sseg && s.Sseg != UNKNOWN);
if (s.Sclass == SC.global || (s.Sclass == SC.static_ && config.objfmt != OBJ_OMF)) // if a pubdef to be done
objmod.pubdefsize(s.Sseg,s,s.Soffset,datasize); // do the definition
if (config.fulltypes &&
!(s.Sclass == SC.static_ && funcsym_p)) // not local static
{
if (config.objfmt == OBJ_ELF || config.objfmt == OBJ_MACH)
dwarf_outsym(s);
else
cv_outsym(s);
}
goto Lret;
}
break;
case DT_common:
assert(!dt.DTnext);
outcommon(s,dt.DTazeros);
goto Lret;
case DT_xoff:
{ Symbol *sb = dt.DTsym;
if (tyfunc(sb.ty()))
{
}
else if (sb.Sdt) // if initializer for symbol
{ if (!s.Sseg) s.Sseg = DATA;
outdata(sb); // write out data for symbol
}
}
goto case;
case DT_coff:
datasize += size(dt.Dty);
break;
default:
debug
printf("dt = %p, dt = %d\n",dt,dt.dt);
assert(0);
}
}
if (s.Sclass == SC.comdat) // if initialized common block
{
seg = objmod.comdatsize(s, datasize);
switch (ty & mTYLINK)
{
case mTYfar: // if far data
s.Sfl = FLfardata;
break;
case mTYcs:
s.Sfl = FLcsdata;
break;
case mTYnear:
case 0:
s.Sfl = FLdata; // initialized data
break;
case mTYthread:
s.Sfl = FLtlsdata;
break;
case mTYweakLinkage:
s.Sfl = FLdata; // initialized data
break;
default:
assert(0);
}
}
else
{
switch (ty & mTYLINK)
{
case mTYcs:
seg = codeseg;
Offset(codeseg) = _align(datasize,Offset(codeseg));
s.Soffset = Offset(codeseg);
s.Sfl = FLcsdata;
break;
case mTYthreadData:
{
assert(config.objfmt == OBJ_MACH && I64);
seg_data *pseg = objmod.tlsseg_data();
s.Sseg = pseg.SDseg;
objmod.data_start(s, datasize, s.Sseg);
seg = pseg.SDseg;
s.Sfl = FLtlsdata;
break;
}
case mTYthread:
{
seg_data *pseg = objmod.tlsseg();
s.Sseg = pseg.SDseg;
objmod.data_start(s, datasize, s.Sseg);
seg = pseg.SDseg;
s.Sfl = FLtlsdata;
break;
}
case mTYnear:
case 0:
if (
s.Sseg == 0 ||
s.Sseg == UNKNOWN)
s.Sseg = DATA;
seg = objmod.data_start(s,datasize,DATA);
s.Sfl = FLdata; // initialized data
break;
default:
assert(0);
}
}
if (s.Sseg == UNKNOWN && (config.objfmt == OBJ_ELF || config.objfmt == OBJ_MACH))
s.Sseg = seg;
else if (config.objfmt == OBJ_OMF)
s.Sseg = seg;
else
seg = s.Sseg;
if (s.Sclass == SC.global || (s.Sclass == SC.static_ && config.objfmt != OBJ_OMF))
objmod.pubdefsize(seg,s,s.Soffset,datasize); /* do the definition */
assert(s.Sseg != UNKNOWN);
if (config.fulltypes &&
!(s.Sclass == SC.static_ && funcsym_p)) // not local static
{
if (config.objfmt == OBJ_ELF || config.objfmt == OBJ_MACH)
dwarf_outsym(s);
else
cv_outsym(s);
}
/* Go back through list, now that we know its size, and send out */
/* the data. */
offset = s.Soffset;
dt_writeToObj(objmod, dtstart, seg, offset);
Offset(seg) = offset;
Lret:
dt_free(dtstart);
}
/********************************************
* Write dt to Object file.
* Params:
* objmod = reference to object file
* dt = data to write
* seg = segment to write it to
* offset = starting offset in segment - will get updated to reflect ending offset
*/
@trusted
void dt_writeToObj(Obj objmod, dt_t *dt, int seg, ref targ_size_t offset)
{
for (; dt; dt = dt.DTnext)
{
switch (dt.dt)
{
case DT_abytes:
{
int flags;
if (tyreg(dt.Dty))
flags = CFoff;
else
flags = CFoff | CFseg;
if (I64)
flags |= CFoffset64;
if (tybasic(dt.Dty) == TYcptr)
objmod.reftocodeseg(seg,offset,dt.DTabytes);
else
{
if (config.exe & EX_posix)
{
objmod.reftodatseg(seg,offset,dt.DTabytes,dt.DTseg,flags);
}
else
{
if (dt.DTseg == DATA)
objmod.reftodatseg(seg,offset,dt.DTabytes,DATA,flags);
else
{
if (dt.DTseg == CDATA)
objmod.reftodatseg(seg,offset,dt.DTabytes,CDATA,flags);
else
objmod.reftofarseg(seg,offset,dt.DTabytes,dt.DTseg,flags);
}
}
}
offset += size(dt.Dty);
break;
}
case DT_ibytes:
objmod.bytes(seg,offset,dt.DTn,dt.DTdata.ptr);
offset += dt.DTn;
break;
case DT_nbytes:
objmod.bytes(seg,offset,dt.DTnbytes,dt.DTpbytes);
offset += dt.DTnbytes;
break;
case DT_azeros:
//printf("objmod.lidata(seg = %d, offset = %d, azeros = %d)\n", seg, offset, dt.DTazeros);
SegData[seg].SDoffset = offset;
objmod.lidata(seg,offset,dt.DTazeros);
offset = SegData[seg].SDoffset;
break;
case DT_xoff:
{
Symbol *sb = dt.DTsym; // get external symbol pointer
targ_size_t a = dt.DToffset; // offset from it
int flags;
if (tyreg(dt.Dty))
flags = CFoff;
else
flags = CFoff | CFseg;
if (I64 && tysize(dt.Dty) == 8)
flags |= CFoffset64;
offset += objmod.reftoident(seg,offset,sb,a,flags);
break;
}
case DT_coff:
objmod.reftocodeseg(seg,offset,dt.DToffset);
offset += _tysize[TYint];
break;
default:
//printf("dt = %p, dt = %d\n",dt,dt.dt);
assert(0);
}
}
}
/******************************
* Output n bytes of a common block, n > 0.
*/
@trusted
void outcommon(Symbol *s,targ_size_t n)
{
//printf("outcommon('%s',%d)\n",s.Sident.ptr,n);
if (n != 0)
{
assert(s.Sclass == SC.global);
if (s.ty() & mTYcs) // if store in code segment
{
/* COMDEFs not supported in code segment
* so put them out as initialized 0s
*/
auto dtb = DtBuilder(0);
dtb.nzeros(cast(uint)n);
s.Sdt = dtb.finish();
outdata(s);
}
else if (s.ty() & mTYthread) // if store in thread local segment
{
if (config.objfmt == OBJ_ELF)
{
s.Sclass = SC.comdef;
objmod.common_block(s, 0, n, 1);
}
else
{
/* COMDEFs not supported in tls segment
* so put them out as COMDATs with initialized 0s
*/
s.Sclass = SC.comdat;
auto dtb = DtBuilder(0);
dtb.nzeros(cast(uint)n);
s.Sdt = dtb.finish();
outdata(s);
}
}
else
{
s.Sclass = SC.comdef;
if (config.objfmt == OBJ_OMF)
{
s.Sxtrnnum = objmod.common_block(s,(s.ty() & mTYfar) == 0,n,1);
if (s.ty() & mTYfar)
s.Sfl = FLfardata;
else
s.Sfl = FLextern;
s.Sseg = UNKNOWN;
pstate.STflags |= PFLcomdef;
}
else
objmod.common_block(s, 0, n, 1);
}
if (config.fulltypes)
{
if (config.objfmt == OBJ_ELF || config.objfmt == OBJ_MACH)
dwarf_outsym(s);
else
cv_outsym(s);
}
}
}
/*************************************
* Mark a Symbol as going into a read-only segment.
*/
@trusted
void out_readonly(Symbol *s)
{
if (config.flags2 & CFG2noreadonly)
return;
if (config.objfmt == OBJ_ELF || config.objfmt == OBJ_MACH)
{
/* Cannot have pointers in CDATA when compiling PIC code, because
* they require dynamic relocations of the read-only segment.
* Instead use the .data.rel.ro section.
* https://issues.dlang.org/show_bug.cgi?id=11171
*/
if (config.flags3 & CFG3pic && dtpointers(s.Sdt))
s.Sseg = CDATAREL;
else
s.Sseg = CDATA;
}
else
{
s.Sseg = CDATA;
}
}
/*************************************
* Write out a readonly string literal in an implementation-defined
* manner.
* Params:
* str = pointer to string data (need not have terminating 0)
* len = number of characters in string
* sz = size of each character (1, 2 or 4)
* Returns: a Symbol pointing to it.
*/
@trusted
Symbol *out_string_literal(const(char)* str, uint len, uint sz)
{
tym_t ty = TYchar;
if (sz == 2)
ty = TYchar16;
else if (sz == 4)
ty = TYdchar;
else if (sz == 8)
ty = TYulong;
Symbol *s = symbol_generate(SC.static_,type_static_array(len, tstypes[ty]));
switch (config.objfmt)
{
case OBJ_ELF:
case OBJ_MACH:
s.Sseg = objmod.string_literal_segment(sz);
break;
case OBJ_MSCOFF:
case OBJ_OMF: // goes into COMDATs, handled elsewhere
default:
assert(0);
}
/* If there are any embedded zeros, this can't go in the special string segments
* which assume that 0 is the end of the string.
*/
switch (sz)
{
case 1:
if (memchr(str, 0, len))
s.Sseg = CDATA;
break;
case 2:
foreach (i; 0 .. len)
{
auto p = cast(const(ushort)*)str;
if (p[i] == 0)
{
s.Sseg = CDATA;
break;
}
}
break;
case 4:
foreach (i; 0 .. len)
{
auto p = cast(const(uint)*)str;
if (p[i] == 0)
{
s.Sseg = CDATA;
break;
}
}
break;
case 8:
foreach (i; 0.. len)
{
auto p = cast(const(ulong)*)str;
if (p[i] == 0)
{
s.Sseg = CDATA;
break;
}
}
break;
default:
assert(0);
}
auto dtb = DtBuilder(0);
dtb.nbytes(cast(uint)(len * sz), str);
dtb.nzeros(cast(uint)sz); // include terminating 0
s.Sdt = dtb.finish();
s.Sfl = FLdata;
s.Salignment = sz;
outdata(s);
return s;
}
/******************************
* Walk expression tree, converting it from a PARSER tree to
* a code generator tree.
*/
@trusted
/*private*/ void outelem(elem *e, ref bool addressOfParam)
{
Symbol *s;
tym_t tym;
elem *e1;
again:
assert(e);
elem_debug(e);
debug
{
if (OTbinary(e.Eoper))
assert(e.EV.E1 && e.EV.E2);
// else if (OTunary(e.Eoper))
// assert(e.EV.E1 && !e.EV.E2);
}
switch (e.Eoper)
{
default:
Lop:
debug
{
//if (!EOP(e)) printf("e.Eoper = x%x\n",e.Eoper);
}
if (OTbinary(e.Eoper))
{ outelem(e.EV.E1, addressOfParam);
e = e.EV.E2;
}
else if (OTunary(e.Eoper))
{
e = e.EV.E1;
}
else
break;
goto again; /* iterate instead of recurse */
case OPaddr:
e1 = e.EV.E1;
if (e1.Eoper == OPvar)
{ // Fold into an OPrelconst
tym = e.Ety;
el_copy(e,e1);
e.Ety = tym;
e.Eoper = OPrelconst;
el_free(e1);
goto again;
}
goto Lop;
case OPrelconst:
case OPvar:
s = e.EV.Vsym;
assert(s);
symbol_debug(s);
switch (s.Sclass)
{
case SC.regpar:
case SC.parameter:
case SC.shadowreg:
if (e.Eoper == OPrelconst)
{
if (I16)
addressOfParam = true; // taking addr of param list
else
s.Sflags &= ~(SFLunambig | GTregcand);
}
break;
case SC.static_:
case SC.locstat:
case SC.extern_:
case SC.global:
case SC.comdat:
case SC.comdef:
case SC.pseudo:
case SC.inline:
case SC.sinline:
case SC.einline:
s.Sflags |= SFLlivexit;
goto case;
case SC.auto_:
case SC.register:
case SC.fastpar:
case SC.bprel:
if (e.Eoper == OPrelconst)
{
s.Sflags &= ~(SFLunambig | GTregcand);
}
else if (s.ty() & mTYfar)
e.Ety |= mTYfar;
break;
default:
break;
}
break;
case OPstring:
case OPconst:
case OPstrthis:
break;
case OPsizeof:
assert(0);
}
}
/*************************************
* Determine register candidates.
*/
@trusted
void out_regcand(symtab_t *psymtab)
{
//printf("out_regcand()\n");
const bool ifunc = (tybasic(funcsym_p.ty()) == TYifunc);
for (SYMIDX si = 0; si < psymtab.length; si++)
{ Symbol *s = (*psymtab)[si];
symbol_debug(s);
//assert(sytab[s.Sclass] & SCSS); // only stack variables
s.Ssymnum = si; // Ssymnum trashed by cpp_inlineexpand
if (!(s.ty() & (mTYvolatile | mTYshared)) &&
!(ifunc && (s.Sclass == SC.parameter || s.Sclass == SC.regpar)) &&
s.Sclass != SC.static_)
s.Sflags |= (GTregcand | SFLunambig); // assume register candidate
else
s.Sflags &= ~(GTregcand | SFLunambig);
}
bool addressOfParam = false; // haven't taken addr of param yet
for (block *b = startblock; b; b = b.Bnext)
{
if (b.Belem)
out_regcand_walk(b.Belem, addressOfParam);
// Any assembler blocks make everything ambiguous
if (b.BC == BCasm)
for (SYMIDX si = 0; si < psymtab.length; si++)
(*psymtab)[si].Sflags &= ~(SFLunambig | GTregcand);
}
// If we took the address of one parameter, assume we took the
// address of all non-register parameters.
if (addressOfParam) // if took address of a parameter
{
for (SYMIDX si = 0; si < psymtab.length; si++)
if ((*psymtab)[si].Sclass == SC.parameter || (*psymtab)[si].Sclass == SC.shadowreg)
(*psymtab)[si].Sflags &= ~(SFLunambig | GTregcand);
}
}
@trusted
private void out_regcand_walk(elem *e, ref bool addressOfParam)
{
while (1)
{ elem_debug(e);
if (OTbinary(e.Eoper))
{ if (e.Eoper == OPstreq)
{ if (e.EV.E1.Eoper == OPvar)
{
Symbol *s = e.EV.E1.EV.Vsym;
s.Sflags &= ~(SFLunambig | GTregcand);
}
if (e.EV.E2.Eoper == OPvar)
{
Symbol *s = e.EV.E2.EV.Vsym;
s.Sflags &= ~(SFLunambig | GTregcand);
}
}
out_regcand_walk(e.EV.E1, addressOfParam);
e = e.EV.E2;
}
else if (OTunary(e.Eoper))
{
// Don't put 'this' pointers in registers if we need
// them for EH stack cleanup.
if (e.Eoper == OPctor)
{ elem *e1 = e.EV.E1;
if (e1.Eoper == OPadd)
e1 = e1.EV.E1;
if (e1.Eoper == OPvar)
e1.EV.Vsym.Sflags &= ~GTregcand;
}
e = e.EV.E1;
}
else
{ if (e.Eoper == OPrelconst)
{
Symbol *s = e.EV.Vsym;
assert(s);
symbol_debug(s);
switch (s.Sclass)
{
case SC.regpar:
case SC.parameter:
case SC.shadowreg:
if (I16)
addressOfParam = true; // taking addr of param list
else
s.Sflags &= ~(SFLunambig | GTregcand);
break;
case SC.auto_:
case SC.register:
case SC.fastpar:
case SC.bprel:
s.Sflags &= ~(SFLunambig | GTregcand);
break;
default:
break;
}
}
else if (e.Eoper == OPvar)
{
if (e.EV.Voffset)
{ if (!(e.EV.Voffset == 1 && tybyte(e.Ety)) &&
!(e.EV.Voffset == REGSIZE && tysize(e.Ety) == REGSIZE))
{
e.EV.Vsym.Sflags &= ~GTregcand;
}
}
}
break;
}
}
}
/**************************
* Optimize function,
* generate code for it,
* and write it out.
*/
@trusted
void writefunc(Symbol *sfunc)
{
cstate.CSpsymtab = &globsym;
writefunc2(sfunc);
cstate.CSpsymtab = null;
}
@trusted
private void writefunc2(Symbol *sfunc)
{
func_t *f = sfunc.Sfunc;
//printf("writefunc(%s)\n",sfunc.Sident.ptr);
//symbol_print(sfunc);
debug debugy && printf("writefunc(%s)\n",sfunc.Sident.ptr);
/* Signify that function has been output */
/* (before inline_do() to prevent infinite recursion!) */
f.Fflags &= ~Fpending;
f.Fflags |= Foutput;
if (eecontext.EEcompile && eecontext.EEfunc != sfunc)
return;
/* Copy local symbol table onto main one, making sure */
/* that the symbol numbers are adjusted accordingly */
//printf("f.Flocsym.length = %d\n",f.Flocsym.length);
debug debugy && printf("appending symbols to symtab...\n");
const nsymbols = f.Flocsym.length;
globsym.setLength(nsymbols);
foreach (si; 0 .. nsymbols)
globsym[si] = f.Flocsym[si];
assert(startblock == null);
startblock = sfunc.Sfunc.Fstartblock;
sfunc.Sfunc.Fstartblock = null;
assert(startblock);
assert(funcsym_p == null);
funcsym_p = sfunc;
tym_t tyf = tybasic(sfunc.ty());
// TX86 computes parameter offsets in stackoffsets()
//printf("globsym.length = %d\n", globsym.length);
for (SYMIDX si = 0; si < globsym.length; si++)
{ Symbol *s = globsym[si];
symbol_debug(s);
//printf("symbol %d '%s'\n",si,s.Sident.ptr);
type_size(s.Stype); // do any forward template instantiations
s.Ssymnum = si; // Ssymnum trashed by cpp_inlineexpand
s.Sflags &= ~(SFLunambig | GTregcand);
switch (s.Sclass)
{
case SC.bprel:
s.Sfl = FLbprel;
goto L3;
case SC.auto_:
case SC.register:
s.Sfl = FLauto;
goto L3;
case SC.fastpar:
s.Sfl = FLfast;
goto L3;
case SC.regpar:
case SC.parameter:
case SC.shadowreg:
s.Sfl = FLpara;
if (tyf == TYifunc)
{ s.Sflags |= SFLlivexit;
break;
}
L3:
if (!(s.ty() & (mTYvolatile | mTYshared)))
s.Sflags |= GTregcand | SFLunambig; // assume register candidate */
break;
case SC.pseudo:
s.Sfl = FLpseudo;
break;
case SC.static_:
break; // already taken care of by datadef()
case SC.stack:
s.Sfl = FLstack;
break;
default:
symbol_print(s);
assert(0);
}
}
bool addressOfParam = false; // see if any parameters get their address taken
bool anyasm = false;
for (block *b = startblock; b; b = b.Bnext)
{
memset(&b._BLU,0,block.sizeof - block._BLU.offsetof);
if (b.Belem)
{ outelem(b.Belem, addressOfParam);
if (b.Belem.Eoper == OPhalt)
{ b.BC = BCexit;
list_free(&b.Bsucc,FPNULL);
}
}
if (b.BC == BCasm)
anyasm = true;
if (sfunc.Sflags & SFLexit && (b.BC == BCret || b.BC == BCretexp))
{ b.BC = BCexit;
list_free(&b.Bsucc,FPNULL);
}
assert(b != b.Bnext);
}
PARSER = 0;
if (eecontext.EEelem)
{
const marksi = globsym.length;
eecontext.EEin++;
outelem(eecontext.EEelem, addressOfParam);
eecontext.EEelem = doptelem(eecontext.EEelem,true);
eecontext.EEin--;
eecontext_convs(marksi);
}
// If we took the address of one parameter, assume we took the
// address of all non-register parameters.
if (addressOfParam | anyasm) // if took address of a parameter
{
for (SYMIDX si = 0; si < globsym.length; si++)
if (anyasm || globsym[si].Sclass == SC.parameter)
globsym[si].Sflags &= ~(SFLunambig | GTregcand);
}
block_pred(); // compute predecessors to blocks
block_compbcount(); // eliminate unreachable blocks
debug { } else
{
if (debugb)
{
WRfunc("codegen", funcsym_p, startblock);