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toobj.d
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toobj.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2018 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/tocsym.d, _toobj.d)
* Documentation: https://dlang.org/phobos/dmd_toobj.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/toobj.d
*/
module dmd.toobj;
import core.stdc.stdio;
import core.stdc.stddef;
import core.stdc.string;
import core.stdc.time;
import dmd.root.array;
import dmd.root.outbuffer;
import dmd.root.rmem;
import dmd.root.rootobject;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.attrib;
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.hdrgen;
import dmd.id;
import dmd.init;
import dmd.irstate;
import dmd.mtype;
import dmd.nspace;
import dmd.objc_glue;
import dmd.statement;
import dmd.staticassert;
import dmd.target;
import dmd.tocsym;
import dmd.toctype;
import dmd.tocvdebug;
import dmd.todt;
import dmd.tokens;
import dmd.traits;
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.ty;
import dmd.backend.type;
extern (C++):
alias toSymbol = dmd.tocsym.toSymbol;
alias toSymbol = dmd.glue.toSymbol;
/* ================================================================== */
// Put out instance of ModuleInfo for this Module
void genModuleInfo(Module m)
{
//printf("Module.genmoduleinfo() %s\n", m.toChars());
if (!Module.moduleinfo)
{
ObjectNotFound(Id.ModuleInfo);
}
Symbol *msym = toSymbol(m);
//////////////////////////////////////////////
m.csym.Sclass = SCglobal;
m.csym.Sfl = FLdata;
scope dtb = new DtBuilder();
ClassDeclarations aclasses;
//printf("members.dim = %d\n", members.dim);
foreach (i; 0 .. m.members.dim)
{
Dsymbol member = (*m.members)[i];
//printf("\tmember '%s'\n", member.toChars());
member.addLocalClass(&aclasses);
}
// importedModules[]
size_t aimports_dim = m.aimports.dim;
for (size_t i = 0; i < m.aimports.dim; i++)
{
Module mod = m.aimports[i];
if (!mod.needmoduleinfo)
aimports_dim--;
}
FuncDeclaration sgetmembers = m.findGetMembers();
// These must match the values in druntime/src/object_.d
enum
{
MIstandalone = 0x4,
MItlsctor = 0x8,
MItlsdtor = 0x10,
MIctor = 0x20,
MIdtor = 0x40,
MIxgetMembers = 0x80,
MIictor = 0x100,
MIunitTest = 0x200,
MIimportedModules = 0x400,
MIlocalClasses = 0x800,
MIname = 0x1000,
}
uint flags = 0;
if (!m.needmoduleinfo)
flags |= MIstandalone;
if (m.sctor)
flags |= MItlsctor;
if (m.sdtor)
flags |= MItlsdtor;
if (m.ssharedctor)
flags |= MIctor;
if (m.sshareddtor)
flags |= MIdtor;
if (sgetmembers)
flags |= MIxgetMembers;
if (m.sictor)
flags |= MIictor;
if (m.stest)
flags |= MIunitTest;
if (aimports_dim)
flags |= MIimportedModules;
if (aclasses.dim)
flags |= MIlocalClasses;
flags |= MIname;
dtb.dword(flags); // _flags
dtb.dword(0); // _index
if (flags & MItlsctor)
dtb.xoff(m.sctor, 0, TYnptr);
if (flags & MItlsdtor)
dtb.xoff(m.sdtor, 0, TYnptr);
if (flags & MIctor)
dtb.xoff(m.ssharedctor, 0, TYnptr);
if (flags & MIdtor)
dtb.xoff(m.sshareddtor, 0, TYnptr);
if (flags & MIxgetMembers)
dtb.xoff(toSymbol(sgetmembers), 0, TYnptr);
if (flags & MIictor)
dtb.xoff(m.sictor, 0, TYnptr);
if (flags & MIunitTest)
dtb.xoff(m.stest, 0, TYnptr);
if (flags & MIimportedModules)
{
dtb.size(aimports_dim);
foreach (i; 0 .. m.aimports.dim)
{
Module mod = m.aimports[i];
if (!mod.needmoduleinfo)
continue;
Symbol *s = toSymbol(mod);
/* Weak references don't pull objects in from the library,
* they resolve to 0 if not pulled in by something else.
* Don't pull in a module just because it was imported.
*/
s.Sflags |= SFLweak;
dtb.xoff(s, 0, TYnptr);
}
}
if (flags & MIlocalClasses)
{
dtb.size(aclasses.dim);
foreach (i; 0 .. aclasses.dim)
{
ClassDeclaration cd = aclasses[i];
dtb.xoff(toSymbol(cd), 0, TYnptr);
}
}
if (flags & MIname)
{
// Put out module name as a 0-terminated string, to save bytes
m.nameoffset = dtb.length();
const(char) *name = m.toPrettyChars();
m.namelen = strlen(name);
dtb.nbytes(cast(uint)m.namelen + 1, name);
//printf("nameoffset = x%x\n", nameoffset);
}
objc.generateModuleInfo();
m.csym.Sdt = dtb.finish();
out_readonly(m.csym);
outdata(m.csym);
//////////////////////////////////////////////
objmod.moduleinfo(msym);
}
/*****************************************
* write pointer references for typed data to the object file
* a class type is considered to mean a reference to a class instance
* Params:
* type = type of the data to check for pointers
* s = symbol that contains the data
* offset = offset of the data inside the Symbol's memory
*/
void write_pointers(Type type, Symbol *s, uint offset)
{
uint ty = type.toBasetype().ty;
if (ty == Tclass)
return objmod.write_pointerRef(s, offset);
write_instance_pointers(type, s, offset);
}
/*****************************************
* write pointer references for typed data to the object file
* a class type is considered to mean the instance, not a reference
* Params:
* type = type of the data to check for pointers
* s = symbol that contains the data
* offset = offset of the data inside the Symbol's memory
*/
void write_instance_pointers(Type type, Symbol *s, uint offset)
{
if (!type.hasPointers())
return;
Array!(d_uns64) data;
d_uns64 sz = getTypePointerBitmap(Loc.initial, type, &data);
if (sz == d_uns64.max)
return;
const bytes_size_t = cast(size_t)Type.tsize_t.size(Loc.initial);
const bits_size_t = bytes_size_t * 8;
auto words = cast(size_t)(sz / bytes_size_t);
for (size_t i = 0; i < data.dim; i++)
{
size_t bits = words < bits_size_t ? words : bits_size_t;
for (size_t b = 0; b < bits; b++)
if (data[i] & (1L << b))
{
auto off = cast(uint) ((i * bits_size_t + b) * bytes_size_t);
objmod.write_pointerRef(s, off + offset);
}
words -= bits;
}
}
/* ================================================================== */
void toObjFile(Dsymbol ds, bool multiobj)
{
//printf("toObjFile(%s)\n", ds.toChars());
extern (C++) final class ToObjFile : Visitor
{
alias visit = Visitor.visit;
public:
bool multiobj;
this(bool multiobj)
{
this.multiobj = multiobj;
}
void visitNoMultiObj(Dsymbol ds)
{
bool multiobjsave = multiobj;
multiobj = false;
ds.accept(this);
multiobj = multiobjsave;
}
override void visit(Dsymbol ds)
{
//printf("Dsymbol.toObjFile('%s')\n", ds.toChars());
// ignore
}
override void visit(FuncDeclaration fd)
{
// in glue.c
FuncDeclaration_toObjFile(fd, multiobj);
}
override void visit(ClassDeclaration cd)
{
//printf("ClassDeclaration.toObjFile('%s')\n", cd.toChars());
if (cd.type.ty == Terror)
{
cd.error("had semantic errors when compiling");
return;
}
if (!cd.members)
return;
if (multiobj && !cd.hasStaticCtorOrDtor())
{
obj_append(cd);
return;
}
if (global.params.symdebugref)
Type_toCtype(cd.type); // calls toDebug() only once
else if (global.params.symdebug)
toDebug(cd);
assert(cd.semanticRun >= PASS.semantic3done); // semantic() should have been run to completion
enum_SC scclass = SCcomdat;
// Put out the members
for (size_t i = 0; i < cd.members.dim; i++)
{
Dsymbol member = (*cd.members)[i];
/* There might be static ctors in the members, and they cannot
* be put in separate obj files.
*/
member.accept(this);
}
// If something goes wrong during this pass don't bother with the
// rest as we may have incomplete info
// https://issues.dlang.org/show_bug.cgi?id=17918
if (!finishVtbl(cd))
{
return;
}
const bool gentypeinfo = global.params.useTypeInfo && Type.dtypeinfo;
const bool genclassinfo = gentypeinfo || !(cd.isCPPclass || cd.isCOMclass);
// Generate C symbols
if (genclassinfo)
toSymbol(cd); // __ClassZ symbol
toVtblSymbol(cd); // __vtblZ symbol
Symbol *sinit = toInitializer(cd); // __initZ symbol
//////////////////////////////////////////////
// Generate static initializer
{
sinit.Sclass = scclass;
sinit.Sfl = FLdata;
scope dtb = new DtBuilder();
ClassDeclaration_toDt(cd, dtb);
sinit.Sdt = dtb.finish();
out_readonly(sinit);
outdata(sinit);
}
//////////////////////////////////////////////
// Put out the TypeInfo
if (gentypeinfo)
genTypeInfo(cd.loc, cd.type, null);
//toObjFile(cd.type.vtinfo, multiobj);
if (genclassinfo)
{
genClassInfoForClass(cd, sinit);
}
//////////////////////////////////////////////
// Put out the vtbl[]
//printf("putting out %s.vtbl[]\n", toChars());
scope dtbv = new DtBuilder();
if (cd.vtblOffset())
dtbv.xoff(cd.csym, 0, TYnptr); // first entry is ClassInfo reference
foreach (i; cd.vtblOffset() .. cd.vtbl.dim)
{
FuncDeclaration fd = cd.vtbl[i].isFuncDeclaration();
//printf("\tvtbl[%d] = %p\n", i, fd);
if (fd && (fd.fbody || !cd.isAbstract()))
{
dtbv.xoff(toSymbol(fd), 0, TYnptr);
}
else
dtbv.size(0);
}
if (dtbv.isZeroLength())
{
/* Someone made an 'extern (C++) class C { }' with no virtual functions.
* But making an empty vtbl[] causes linking problems, so make a dummy
* entry.
*/
dtbv.size(0);
}
cd.vtblsym.csym.Sdt = dtbv.finish();
cd.vtblsym.csym.Sclass = scclass;
cd.vtblsym.csym.Sfl = FLdata;
out_readonly(cd.vtblsym.csym);
outdata(cd.vtblsym.csym);
if (cd.isExport())
objmod.export_symbol(cd.vtblsym.csym,0);
}
override void visit(InterfaceDeclaration id)
{
//printf("InterfaceDeclaration.toObjFile('%s')\n", id.toChars());
if (id.type.ty == Terror)
{
id.error("had semantic errors when compiling");
return;
}
if (!id.members)
return;
if (global.params.symdebugref)
Type_toCtype(id.type); // calls toDebug() only once
else if (global.params.symdebug)
toDebug(id);
// Put out the members
for (size_t i = 0; i < id.members.dim; i++)
{
Dsymbol member = (*id.members)[i];
visitNoMultiObj(member);
}
// Generate C symbols
toSymbol(id);
//////////////////////////////////////////////
// Put out the TypeInfo
if (global.params.useTypeInfo && Type.dtypeinfo)
{
genTypeInfo(id.loc, id.type, null);
id.type.vtinfo.accept(this);
}
//////////////////////////////////////////////
genClassInfoForInterface(id);
}
override void visit(StructDeclaration sd)
{
//printf("StructDeclaration.toObjFile('%s')\n", sd.toChars());
if (sd.type.ty == Terror)
{
sd.error("had semantic errors when compiling");
return;
}
if (multiobj && !sd.hasStaticCtorOrDtor())
{
obj_append(sd);
return;
}
// Anonymous structs/unions only exist as part of others,
// do not output forward referenced structs's
if (!sd.isAnonymous() && sd.members)
{
if (global.params.symdebugref)
Type_toCtype(sd.type); // calls toDebug() only once
else if (global.params.symdebug)
toDebug(sd);
if (global.params.useTypeInfo && Type.dtypeinfo)
genTypeInfo(sd.loc, sd.type, null);
// Generate static initializer
toInitializer(sd);
if (sd.isInstantiated())
{
sd.sinit.Sclass = SCcomdat;
}
else
{
sd.sinit.Sclass = SCglobal;
}
sd.sinit.Sfl = FLdata;
scope dtb = new DtBuilder();
StructDeclaration_toDt(sd, dtb);
sd.sinit.Sdt = dtb.finish();
out_readonly(sd.sinit); // put in read-only segment
outdata(sd.sinit);
// Put out the members
for (size_t i = 0; i < sd.members.dim; i++)
{
Dsymbol member = (*sd.members)[i];
/* There might be static ctors in the members, and they cannot
* be put in separate obj files.
*/
member.accept(this);
}
if (sd.xeq && sd.xeq != StructDeclaration.xerreq)
sd.xeq.accept(this);
if (sd.xcmp && sd.xcmp != StructDeclaration.xerrcmp)
sd.xcmp.accept(this);
if (sd.xhash)
sd.xhash.accept(this);
}
}
override void visit(VarDeclaration vd)
{
//printf("VarDeclaration.toObjFile(%p '%s' type=%s) protection %d\n", vd, vd.toChars(), vd.type.toChars(), vd.protection);
//printf("\talign = %d\n", vd.alignment);
if (vd.type.ty == Terror)
{
vd.error("had semantic errors when compiling");
return;
}
if (vd.aliassym)
{
visitNoMultiObj(vd.toAlias());
return;
}
// Do not store variables we cannot take the address of
if (!vd.canTakeAddressOf())
{
return;
}
if (!vd.isDataseg() || vd.storage_class & STC.extern_)
return;
Symbol *s = toSymbol(vd);
d_uns64 sz64 = vd.type.size(vd.loc);
if (sz64 == SIZE_INVALID)
{
vd.error("size overflow");
return;
}
if (sz64 >= Target.maxStaticDataSize)
{
vd.error("size of 0x%llx exceeds max allowed size 0x%llx", sz64, Target.maxStaticDataSize);
}
uint sz = cast(uint)sz64;
Dsymbol parent = vd.toParent();
s.Sclass = SCglobal;
do
{
/* Global template data members need to be in comdat's
* in case multiple .obj files instantiate the same
* template with the same types.
*/
if (parent.isTemplateInstance() && !parent.isTemplateMixin())
{
s.Sclass = SCcomdat;
break;
}
parent = parent.parent;
} while (parent);
s.Sfl = FLdata;
if (!sz && vd.type.toBasetype().ty != Tsarray)
assert(0); // this shouldn't be possible
scope dtb = new DtBuilder();
if (config.objfmt == OBJ_MACH && global.params.is64bit && (s.Stype.Tty & mTYLINK) == mTYthread)
{
tlsToDt(vd, s, sz, dtb);
}
else if (!sz)
{
/* Give it a byte of data
* so we can take the 'address' of this symbol
* and avoid problematic behavior of object file format
*/
dtb.nzeros(1);
}
else if (vd._init)
{
initializerToDt(vd, dtb);
}
else
{
Type_toDt(vd.type, dtb);
}
s.Sdt = dtb.finish();
// See if we can convert a comdat to a comdef,
// which saves on exe file space.
if (s.Sclass == SCcomdat &&
s.Sdt &&
dtallzeros(s.Sdt) &&
!vd.isThreadlocal())
{
s.Sclass = SCglobal;
dt2common(&s.Sdt);
}
outdata(s);
if (vd.type.isMutable() || !vd._init)
write_pointers(vd.type, s, 0);
if (vd.isExport())
objmod.export_symbol(s, 0);
}
override void visit(EnumDeclaration ed)
{
if (ed.semanticRun >= PASS.obj) // already written
return;
//printf("EnumDeclaration.toObjFile('%s')\n", ed.toChars());
if (ed.errors || ed.type.ty == Terror)
{
ed.error("had semantic errors when compiling");
return;
}
if (ed.isAnonymous())
return;
if (global.params.symdebugref)
Type_toCtype(ed.type); // calls toDebug() only once
else if (global.params.symdebug)
toDebug(ed);
if (global.params.useTypeInfo && Type.dtypeinfo)
genTypeInfo(ed.loc, ed.type, null);
TypeEnum tc = cast(TypeEnum)ed.type;
if (!tc.sym.members || ed.type.isZeroInit(Loc.initial))
{
}
else
{
enum_SC scclass = SCglobal;
if (ed.isInstantiated())
scclass = SCcomdat;
// Generate static initializer
toInitializer(ed);
ed.sinit.Sclass = scclass;
ed.sinit.Sfl = FLdata;
scope dtb = new DtBuilder();
Expression_toDt(tc.sym.defaultval, dtb);
ed.sinit.Sdt = dtb.finish();
outdata(ed.sinit);
}
ed.semanticRun = PASS.obj;
}
override void visit(TypeInfoDeclaration tid)
{
if (isSpeculativeType(tid.tinfo))
{
//printf("-speculative '%s'\n", tid.toPrettyChars());
return;
}
//printf("TypeInfoDeclaration.toObjFile(%p '%s') protection %d\n", tid, tid.toChars(), tid.protection);
if (multiobj)
{
obj_append(tid);
return;
}
Symbol *s = toSymbol(tid);
s.Sclass = SCcomdat;
s.Sfl = FLdata;
scope dtb = new DtBuilder();
TypeInfo_toDt(dtb, tid);
s.Sdt = dtb.finish();
// See if we can convert a comdat to a comdef,
// which saves on exe file space.
if (s.Sclass == SCcomdat &&
dtallzeros(s.Sdt))
{
s.Sclass = SCglobal;
dt2common(&s.Sdt);
}
outdata(s);
if (tid.isExport())
objmod.export_symbol(s, 0);
}
override void visit(AttribDeclaration ad)
{
Dsymbols *d = ad.include(null);
if (d)
{
for (size_t i = 0; i < d.dim; i++)
{
Dsymbol s = (*d)[i];
s.accept(this);
}
}
}
override void visit(PragmaDeclaration pd)
{
if (pd.ident == Id.lib)
{
assert(pd.args && pd.args.dim == 1);
Expression e = (*pd.args)[0];
assert(e.op == TOK.string_);
StringExp se = cast(StringExp)e;
char *name = cast(char *)mem.xmalloc(se.numberOfCodeUnits() + 1);
se.writeTo(name, true);
/* Embed the library names into the object file.
* The linker will then automatically
* search that library, too.
*/
if (!obj_includelib(name))
{
/* The format does not allow embedded library names,
* so instead append the library name to the list to be passed
* to the linker.
*/
global.params.libfiles.push(name);
}
}
else if (pd.ident == Id.startaddress)
{
assert(pd.args && pd.args.dim == 1);
Expression e = (*pd.args)[0];
Dsymbol sa = getDsymbol(e);
FuncDeclaration f = sa.isFuncDeclaration();
assert(f);
Symbol *s = toSymbol(f);
obj_startaddress(s);
}
visit(cast(AttribDeclaration)pd);
if (pd.ident == Id.crt_constructor || pd.ident == Id.crt_destructor)
{
immutable isCtor = pd.ident == Id.crt_constructor;
static uint recurse(Dsymbol s, bool isCtor)
{
if (auto ad = s.isAttribDeclaration())
{
uint nestedCount;
auto decls = ad.include(null);
if (decls)
{
for (size_t i = 0; i < decls.dim; ++i)
nestedCount += recurse((*decls)[i], isCtor);
}
return nestedCount;
}
else if (auto f = s.isFuncDeclaration())
{
objmod.setModuleCtorDtor(s.csym, isCtor);
if (f.linkage != LINK.c)
f.error("must be `extern(C)` for `pragma(%s)`", isCtor ? "crt_constructor".ptr : "crt_destructor".ptr);
return 1;
}
else
return 0;
assert(0);
}
if (recurse(pd, isCtor) > 1)
pd.error("can only apply to a single declaration");
}
}
override void visit(TemplateInstance ti)
{
//printf("TemplateInstance.toObjFile(%p, '%s')\n", ti, ti.toChars());
if (!isError(ti) && ti.members)
{
if (!ti.needsCodegen())
{
//printf("-speculative (%p, %s)\n", ti, ti.toPrettyChars());
return;
}
//printf("TemplateInstance.toObjFile(%p, '%s')\n", ti, ti.toPrettyChars());
if (multiobj)
{
// Append to list of object files to be written later
obj_append(ti);
}
else
{
for (size_t i = 0; i < ti.members.dim; i++)
{
Dsymbol s = (*ti.members)[i];
s.accept(this);
}
}
}
}
override void visit(TemplateMixin tm)
{
//printf("TemplateMixin.toObjFile('%s')\n", tm.toChars());
if (!isError(tm) && tm.members)
{
for (size_t i = 0; i < tm.members.dim; i++)
{
Dsymbol s = (*tm.members)[i];
s.accept(this);
}
}
}
override void visit(StaticAssert sa)
{
}
override void visit(Nspace ns)
{
//printf("Nspace.toObjFile('%s', this = %p)\n", ns.toChars(), ns);
if (!isError(ns) && ns.members)
{
if (multiobj)
{
// Append to list of object files to be written later
obj_append(ns);
}
else
{
for (size_t i = 0; i < ns.members.dim; i++)
{
Dsymbol s = (*ns.members)[i];
s.accept(this);
}
}
}
}
private:
static void initializerToDt(VarDeclaration vd, DtBuilder dtb)
{
Initializer_toDt(vd._init, dtb);
// Look for static array that is block initialized
ExpInitializer ie = vd._init.isExpInitializer();
Type tb = vd.type.toBasetype();
if (tb.ty == Tsarray && ie &&
!tb.nextOf().equals(ie.exp.type.toBasetype().nextOf()) &&
ie.exp.implicitConvTo(tb.nextOf())
)
{
auto dim = (cast(TypeSArray)tb).dim.toInteger();
// Duplicate Sdt 'dim-1' times, as we already have the first one
while (--dim > 0)
{
Expression_toDt(ie.exp, dtb);
}
}
}
/**
* Output a TLS symbol for Mach-O.
*
* A TLS variable in the Mach-O format consists of two symbols.
* One symbol for the data, which contains the initializer, if any.
* The name of this symbol is the same as the variable, but with the
* "$tlv$init" suffix. If the variable has an initializer it's placed in
* the __thread_data section. Otherwise it's placed in the __thread_bss
* section.
*
* The other symbol is for the TLV descriptor. The symbol has the same
* name as the variable and is placed in the __thread_vars section.
* A TLV descriptor has the following structure, where T is the type of
* the variable:
*
* struct TLVDescriptor(T)
* {
* extern(C) T* function(TLVDescriptor*) thunk;
* size_t key;
* size_t offset;
* }
*
* Params:
* vd = the variable declaration for the symbol
* s = the backend Symbol corresponsing to vd
* sz = data size of s
* dtb = where to put the data
*/
static void tlsToDt(VarDeclaration vd, Symbol *s, uint sz, DtBuilder dtb)
{
assert(config.objfmt == OBJ_MACH && global.params.is64bit && (s.Stype.Tty & mTYLINK) == mTYthread);
Symbol *tlvInit = createTLVDataSymbol(vd, s);
scope tlvInitDtb = new DtBuilder();
if (sz == 0)
tlvInitDtb.nzeros(1);
else if (vd._init)
initializerToDt(vd, tlvInitDtb);
else
Type_toDt(vd.type, tlvInitDtb);
tlvInit.Sdt = tlvInitDtb.finish();
outdata(tlvInit);
if (global.params.is64bit)
tlvInit.Sclass = SCextern;
Symbol* tlvBootstrap = objmod.tlv_bootstrap();
dtb.xoff(tlvBootstrap, 0, TYnptr);
dtb.size(0);
dtb.xoff(tlvInit, 0, TYnptr);
}
/**
* Creates the data symbol used to initialize a TLS variable for Mach-O.
*
* Params:
* vd = the variable declaration for the symbol
* s = the back end symbol corresponding to vd
*
* Returns: the newly created symbol
*/
static Symbol *createTLVDataSymbol(VarDeclaration vd, Symbol *s)
{
assert(config.objfmt == OBJ_MACH && global.params.is64bit && (s.Stype.Tty & mTYLINK) == mTYthread);
// Compute identifier for tlv symbol
OutBuffer buffer;
buffer.writestring(s.Sident);
buffer.writestring("$tlv$init");
const(char) *tlvInitName = buffer.peekString();
// Compute type for tlv symbol
type *t = type_fake(vd.type.ty);
type_setty(&t, t.Tty | mTYthreadData);
type_setmangle(&t, mangle(vd));
Symbol *tlvInit = symbol_name(tlvInitName, SCstatic, t);
tlvInit.Sdt = null;
tlvInit.Salignment = type_alignsize(s.Stype);
if (vd.linkage == LINK.cpp)
tlvInit.Sflags |= SFLpublic;
return tlvInit;
}
/**
* Returns the target mangling mangle_t for the given variable.
*
* Params:
* vd = the variable declaration
*
* Returns:
* the mangling that should be used for variable
*/
static mangle_t mangle(const VarDeclaration vd)
{
final switch (vd.linkage)
{
case LINK.windows: