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glue.d
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glue.d
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/**
* Generate the object file for function declarations and critical sections.
*
* generateCodeAndWrite() is the only function seen by the front end.
*
* Copyright: Copyright (C) 1999-2023 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/glue.d, _glue.d)
* Documentation: $(LINK https://dlang.org/phobos/dmd_glue.html)
* Coverage: $(LINK https://codecov.io/gh/dlang/dmd/src/master/src/dmd/glue.d)
*/
module dmd.glue;
import core.stdc.stdio;
import core.stdc.string;
import core.stdc.stdlib;
import dmd.root.array;
import dmd.root.file;
import dmd.root.filename;
import dmd.common.outbuffer;
import dmd.root.rmem;
import dmd.root.string;
import dmd.backend.cdef;
import dmd.backend.cc;
import dmd.backend.code;
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.symtab;
import dmd.backend.ty;
import dmd.backend.type;
import dmd.aggregate;
import dmd.arraytypes;
import dmd.astenums;
import dmd.blockexit;
import dmd.dclass;
import dmd.declaration;
import dmd.dmangle;
import dmd.dmdparams;
import dmd.dmodule;
import dmd.dmsc;
import dmd.dstruct;
import dmd.dsymbol;
import dmd.dtemplate;
import dmd.e2ir;
import dmd.errors;
import dmd.expression;
import dmd.func;
import dmd.globals;
import dmd.identifier;
import dmd.id;
import dmd.lib;
import dmd.location;
import dmd.mtype;
import dmd.objc_glue;
import dmd.s2ir;
import dmd.statement;
import dmd.target;
import dmd.tocsym;
import dmd.toctype;
import dmd.toir;
import dmd.toobj;
import dmd.typesem;
import dmd.utils;
private:
alias symbols = Array!(Symbol*);
public alias toSymbol = dmd.tocsym.toSymbol;
/**
* Generate code for `modules` and write objects/libraries
*
* Params:
* modules = array of `Module`s to generate code for
* libmodules = array of objects/libraries already generated (passed on command line)
* libname = {.lib,.a} file output name
* objdir = directory to write object files to
* writeLibrary = write library file instead of object file(s)
* obj = generate object files
* oneobj = write one object file instead of multiple ones
* multiobj = break one object file into multiple ones
* verbose = print progress message when generatig code
*/
public void generateCodeAndWrite(Module[] modules, const(char)*[] libmodules,
const(char)[] libname, const(char)[] objdir,
bool writeLibrary, bool obj, bool oneobj, bool multiobj,
bool verbose)
{
auto eSink = global.errorSink;
Library library = null;
if (writeLibrary)
{
library = Library.factory(target.objectFormat(), target.lib_ext, eSink);
/* Determine actual file name of library to write to by combining
* objdir, libname, the first object file name, and lib_ext
*/
const(char)[] arg;
if (!libname.length)
{
// get name of the first object file
const(char)[] n = global.params.objfiles[0].toDString;
n = FileName.name(n); // remove its path
arg = FileName.forceExt(n, library.lib_ext); // force library name extension
}
else
arg = FileName.defaultExt(libname, library.lib_ext);
if (!FileName.absolute(arg))
arg = FileName.combine(objdir, arg);
library.setFilename(arg);
// Add input object and input library files to output library
foreach (p; libmodules)
library.addObject(p.toDString(), null);
}
if (!obj)
{
}
else if (oneobj)
{
OutBuffer objbuf;
Module firstm; // first module we generate code for
foreach (m; modules)
{
if (m.filetype == FileType.dhdr)
continue;
if (!firstm)
{
firstm = m;
obj_start(objbuf, m.srcfile.toChars());
}
if (verbose)
message("code %s", m.toChars());
genObjFile(m, false);
}
if (!global.errors && firstm)
{
obj_end(objbuf, library, firstm.objfile.toChars());
}
}
else
{
OutBuffer objbuf;
foreach (m; modules)
{
if (m.filetype == FileType.dhdr)
continue;
if (verbose)
message("code %s", m.toChars());
obj_start(objbuf, m.srcfile.toChars());
genObjFile(m, multiobj);
obj_end(objbuf, library, m.objfile.toChars());
obj_write_deferred(objbuf, library, glue.obj_symbols_towrite);
if (global.errors && !writeLibrary)
m.deleteObjFile();
}
}
if (writeLibrary && !global.errors)
{
if (global.params.v.verbose)
eSink.message(Loc.initial, "library %s", library.loc.filename);
auto filenameString = library.loc.filename.toDString;
if (!ensurePathToNameExists(Loc.initial, filenameString))
fatal();
/* Write library to temporary file. If that is successful,
* then and only then replace the existing file with the temporary file
*/
auto tmpname = filenameString ~ ".tmp\0";
auto libbuf = OutBuffer(tmpname.ptr);
library.writeLibToBuffer(libbuf);
if (!libbuf.moveToFile(library.loc.filename))
{
eSink.error(library.loc, "error writing file '%s'", library.loc.filename);
destroy(tmpname);
fatal();
}
destroy(tmpname);
}
}
extern (C++):
//extern
public __gshared Symbol* bzeroSymbol; /// common location for immutable zeros
struct Glue
{
elem *eictor;
Symbol *ictorlocalgot;
symbols sctors;
StaticDtorDeclarations ectorgates;
symbols sdtors;
symbols stests;
symbols ssharedctors;
SharedStaticDtorDeclarations esharedctorgates;
symbols sshareddtors;
const(char)* lastmname;
Dsymbols obj_symbols_towrite;
}
private __gshared Glue glue;
/**************************************
* Append s to list of object files to generate later.
* Only happens with multiobj.
*/
public void obj_append(Dsymbol s)
{
//printf("deferred: %s\n", s.toChars());
glue.obj_symbols_towrite.push(s);
}
/*******************************
* Generating multiple object files, one per Dsymbol
* in symbols_towrite[].
* Params:
* library = library to write object files to
* symbols_towrite = array of Dsymbols
*/
extern (D)
private void obj_write_deferred(ref OutBuffer objbuf, Library library, ref Dsymbols symbols_towrite)
{
// this array can grow during the loop; do not replace with foreach
for (size_t i = 0; i < symbols_towrite.length; ++i)
{
Dsymbol s = symbols_towrite[i];
Module m = s.getModule();
const(char)* mname;
if (m)
{
mname = m.srcfile.toChars();
glue.lastmname = mname;
}
else
{
//mname = s.ident.toChars();
mname = glue.lastmname;
assert(mname);
}
obj_start(objbuf, mname);
__gshared int count;
count++; // sequence for generating names
/* Create a module that's a doppelganger of m, with just
* enough to be able to create the moduleinfo.
*/
OutBuffer idbuf;
idbuf.printf("%s.%d", m ? m.ident.toChars() : mname, count);
if (!m)
{
// it doesn't make sense to make up a module if we don't know where to put the symbol
// so output it into its own object file without ModuleInfo
objmod.initfile(idbuf.peekChars(), null, mname);
toObjFile(s, false);
objmod.termfile();
}
else
{
Identifier id = Identifier.create(idbuf.extractChars());
Module md = new Module(mname.toDString, id, 0, 0);
md.members = new Dsymbols();
md.members.push(s); // its only 'member' is s
md.doppelganger = 1; // identify this module as doppelganger
md.md = m.md;
md.aimports.push(m); // it only 'imports' m
genObjFile(md, false);
}
/* Set object file name to be source name with sequence number,
* as mangled symbol names get way too long.
*/
const(char)* fname = FileName.removeExt(mname);
OutBuffer namebuf;
uint hash = 0;
for (const(char)* p = s.toChars(); *p; p++)
hash += *p;
namebuf.printf("%s_%x_%x.%.*s", fname, count, hash,
cast(int)target.obj_ext.length, target.obj_ext.ptr);
FileName.free(cast(char *)fname);
fname = namebuf.extractChars();
//printf("writing '%s'\n", fname);
obj_end(objbuf, library, fname);
}
glue.obj_symbols_towrite.length = 0;
}
/***********************************************
* Generate function that calls array of functions and gates.
* Params:
* m = module symbol (for name mangling purposes)
* sctors = array of functions
* ectorgates = array of gates
* id = identifier string for generator function
* Returns:
* function Symbol generated
*/
extern (D)
private Symbol *callFuncsAndGates(Module m, Symbol*[] sctors, StaticDtorDeclaration[] ectorgates,
const(char)* id)
{
if (!sctors.length && !ectorgates.length)
return null;
Symbol *sctor = null;
__gshared type *t;
if (!t)
{
/* t will be the type of the functions generated:
* extern (C) void func();
*/
t = type_function(TYnfunc, null, false, tstypes[TYvoid]);
t.Tmangle = mTYman_c;
}
localgot = null;
sctor = toSymbolX(m, id, SC.global, t, "FZv");
cstate.CSpsymtab = &sctor.Sfunc.Flocsym;
elem *ector = null;
foreach (f; ectorgates)
{
Symbol *s = toSymbol(f.vgate);
elem *e = el_var(s);
e = el_bin(OPaddass, TYint, e, el_long(TYint, 1));
ector = el_combine(ector, e);
}
foreach (s; sctors)
{
elem *e = el_una(OPucall, TYvoid, el_var(s));
ector = el_combine(ector, e);
}
block *b = block_calloc();
b.BC = BCret;
b.Belem = ector;
sctor.Sfunc.Fstartline.Sfilename = m.arg.xarraydup.ptr;
sctor.Sfunc.Fstartblock = b;
writefunc(sctor); // hand off to backend
return sctor;
}
/**************************************
* Prepare for generating obj file.
* Params:
* objbuf = write object file contents to this
* srcfile = name of the source file
*/
private void obj_start(ref OutBuffer objbuf, const(char)* srcfile)
{
//printf("obj_start()\n");
bzeroSymbol = null;
rtlsym_reset();
clearStringTab();
version (Windows)
{
import dmd.backend.mscoffobj;
import dmd.backend.cgobj;
// Produce Ms COFF files by default, OMF for -m32omf
assert(objbuf.length() == 0);
switch (target.objectFormat())
{
case Target.ObjectFormat.coff: objmod = MsCoffObj_init(&objbuf, srcfile, null); break;
case Target.ObjectFormat.omf: objmod = OmfObj_init(&objbuf, srcfile, null); break;
default: assert(0);
}
}
else
{
objmod = Obj.initialize(&objbuf, srcfile, null);
}
OutBuffer buf;
buf.write("DMD ");
buf.write(global.versionString());
Obj.compiler(buf.peekChars());
el_reset();
cg87_reset();
out_reset();
objc.reset();
}
/****************************************
* Finish creating the object module and writing it to objbuf[].
* Then either write the object module to an actual file,
* or add it to a library.
* Params:
* objbuf = contains the generated contents of the object file
* objfilename = what to call the object module
* library = if non-null, add object module to this library
*/
private void obj_end(ref OutBuffer objbuf, Library library, const(char)* objfilename)
{
objmod.term(objfilename);
//delete objmod;
objmod = null;
if (library)
{
// Transfer ownership of image buffer to library
library.addObject(objfilename.toDString(), cast(ubyte[]) objbuf.extractSlice[]);
}
else
{
//printf("write obj %s\n", objfilename);
if (!writeFile(Loc.initial, objfilename.toDString, objbuf[]))
return fatal();
// For non-libraries, the object buffer should be cleared to
// avoid repetitions.
objbuf.destroy();
}
}
public extern (D) bool obj_includelib(scope const char[] name) nothrow
{
return objmod.includelib(name);
}
public void obj_startaddress(Symbol *s)
{
return objmod.startaddress(s);
}
public bool obj_linkerdirective(const(char)* directive)
{
return objmod.linkerdirective(directive);
}
/**************************************
* Generate .obj file for Module.
*/
private void genObjFile(Module m, bool multiobj)
{
//EEcontext *ee = env.getEEcontext();
//printf("Module.genobjfile(multiobj = %d) %s\n", multiobj, m.toChars());
glue.lastmname = m.srcfile.toChars();
objmod.initfile(glue.lastmname, null, m.toPrettyChars());
glue.eictor = null;
glue.ictorlocalgot = null;
glue.sctors.setDim(0);
glue.ectorgates.setDim(0);
glue.sdtors.setDim(0);
glue.ssharedctors.setDim(0);
glue.esharedctorgates.setDim(0);
glue.sshareddtors.setDim(0);
glue.stests.setDim(0);
if (m.doppelganger)
{
/* Generate a reference to the moduleinfo, so the module constructors
* and destructors get linked in.
*/
Module mod = m.aimports[0];
assert(mod);
if (mod.sictor || mod.sctor || mod.sdtor || mod.ssharedctor || mod.sshareddtor)
{
Symbol *s = toSymbol(mod);
//objextern(s);
//if (!s.Sxtrnnum) objextdef(s.Sident);
if (!s.Sxtrnnum)
{
//printf("%s\n", s.Sident);
//#if 0 /* This should work, but causes optlink to fail in common/newlib.asm */
// objextdef(s.Sident);
//#else
Symbol *sref = symbol_generate(SC.static_, type_fake(TYnptr));
sref.Sfl = FLdata;
auto dtb = DtBuilder(0);
dtb.xoff(s, 0, TYnptr);
sref.Sdt = dtb.finish();
outdata(sref);
//#endif
}
}
}
if (global.params.cov)
{
/* Create coverage identifier:
* uint[numlines] __coverage;
*/
m.cov = toSymbolX(m, "__coverage", SC.static_, type_fake(TYint), "Z");
m.cov.Sflags |= SFLhidden;
m.cov.Stype.Tmangle = mTYman_d;
m.cov.Sfl = FLdata;
auto dtb = DtBuilder(0);
if (m.ctfe_cov)
{
// initalize the uint[] __coverage symbol with data from ctfe.
static extern (C) int comp_uints (const scope void* a, const scope void* b)
{ return (*cast(uint*) a) - (*cast(uint*) b); }
uint[] sorted_lines = m.ctfe_cov.keys;
qsort(sorted_lines.ptr, sorted_lines.length, sorted_lines[0].sizeof,
&comp_uints);
uint lastLine = 0;
foreach (line;sorted_lines)
{
// zero fill from last line to line.
if (line)
{
assert(line > lastLine);
dtb.nzeros((line - lastLine - 1) * 4);
}
dtb.dword(m.ctfe_cov[line]);
lastLine = line;
}
// zero fill from last line to end
if (m.numlines > lastLine)
dtb.nzeros((m.numlines - lastLine) * 4);
}
else
{
dtb.nzeros(4 * m.numlines);
}
m.cov.Sdt = dtb.finish();
outdata(m.cov);
size_t sz = m.covb[0].sizeof;
size_t n = (m.numlines + sz * 8) / (sz * 8);
uint* p = cast(uint*)Mem.check(calloc(n, sz));
m.covb = p[0 .. n];
}
for (int i = 0; i < m.members.length; i++)
{
auto member = (*m.members)[i];
//printf("toObjFile %s %s\n", member.kind(), member.toChars());
toObjFile(member, multiobj);
}
if (global.params.cov)
{
/* Generate
* private bit[numlines] __bcoverage;
*/
Symbol *bcov = symbol_calloc("__bcoverage");
bcov.Stype = type_fake(TYuint);
bcov.Stype.Tcount++;
bcov.Sclass = SC.static_;
bcov.Sfl = FLdata;
auto dtb = DtBuilder(0);
dtb.nbytes(cast(uint)(m.covb.length * m.covb[0].sizeof), cast(char*)m.covb.ptr);
bcov.Sdt = dtb.finish();
outdata(bcov);
free(m.covb.ptr);
m.covb = null;
/* Generate:
* _d_cover_register(uint[] __coverage, BitArray __bcoverage, string filename);
* and prepend it to the static constructor.
*/
/* t will be the type of the functions generated:
* extern (C) void func();
*/
type *t = type_function(TYnfunc, null, false, tstypes[TYvoid]);
t.Tmangle = mTYman_c;
m.sictor = toSymbolX(m, "__modictor", SC.global, t, "FZv");
cstate.CSpsymtab = &m.sictor.Sfunc.Flocsym;
localgot = glue.ictorlocalgot;
elem *ecov = el_pair(TYdarray, el_long(TYsize_t, m.numlines), el_ptr(m.cov));
elem *ebcov = el_pair(TYdarray, el_long(TYsize_t, m.numlines), el_ptr(bcov));
if (target.os == Target.OS.Windows && target.isX86_64)
{
ecov = addressElem(ecov, Type.tvoid.arrayOf(), false);
ebcov = addressElem(ebcov, Type.tvoid.arrayOf(), false);
}
elem *efilename = toEfilename(m);
if (target.os == Target.OS.Windows && target.isX86_64)
efilename = addressElem(efilename, Type.tstring, true);
elem *e = el_params(
el_long(TYuchar, global.params.covPercent),
ecov,
ebcov,
efilename,
null);
e = el_bin(OPcall, TYvoid, el_var(getRtlsym(RTLSYM.DCOVER2)), e);
glue.eictor = el_combine(e, glue.eictor);
glue.ictorlocalgot = localgot;
}
// If coverage / static constructor / destructor / unittest calls
if (glue.eictor || glue.sctors.length || glue.ectorgates.length || glue.sdtors.length ||
glue.ssharedctors.length || glue.esharedctorgates.length || glue.sshareddtors.length || glue.stests.length)
{
if (glue.eictor)
{
localgot = glue.ictorlocalgot;
block *b = block_calloc();
b.BC = BCret;
b.Belem = glue.eictor;
m.sictor.Sfunc.Fstartline.Sfilename = m.arg.xarraydup.ptr;
m.sictor.Sfunc.Fstartblock = b;
writefunc(m.sictor);
}
m.sctor = callFuncsAndGates(m, glue.sctors[], glue.ectorgates[], "__modctor");
m.sdtor = callFuncsAndGates(m, glue.sdtors[], null, "__moddtor");
m.ssharedctor = callFuncsAndGates(m, glue.ssharedctors[], cast(StaticDtorDeclaration[])glue.esharedctorgates[], "__modsharedctor");
m.sshareddtor = callFuncsAndGates(m, glue.sshareddtors[], null, "__modshareddtor");
m.stest = callFuncsAndGates(m, glue.stests[], null, "__modtest");
if (m.doppelganger)
genModuleInfo(m);
}
if (m.doppelganger)
{
objc.generateModuleInfo(m);
objmod.termfile();
return;
}
/* Generate module info for templates and -cov.
* Don't generate ModuleInfo if `object.ModuleInfo` is not declared or
* explicitly disabled through compiler switches such as `-betterC`.
* Don't generate ModuleInfo for C files.
*/
if (global.params.useModuleInfo && Module.moduleinfo && m.filetype != FileType.c/*|| needModuleInfo()*/)
genModuleInfo(m);
objmod.termfile();
}
/* ================================================================== */
private UnitTestDeclaration needsDeferredNested(FuncDeclaration fd)
{
while (fd && fd.isNested())
{
FuncDeclaration fdp = fd.toParent2().isFuncDeclaration();
if (!fdp)
break;
if (UnitTestDeclaration udp = fdp.isUnitTestDeclaration())
return udp.semanticRun < PASS.obj ? udp : null;
fd = fdp;
}
return null;
}
public void FuncDeclaration_toObjFile(FuncDeclaration fd, bool multiobj)
{
ClassDeclaration cd = fd.parent.isClassDeclaration();
//printf("FuncDeclaration_toObjFile(%p, %s.%s)\n", fd, fd.parent.toChars(), fd.toChars());
//printf("storage_class: %llx\n", fd.storage_class);
//if (type) printf("type = %s\n", type.toChars());
version (none)
{
//printf("line = %d\n", getWhere() / LINEINC);
EEcontext *ee = env.getEEcontext();
if (ee.EEcompile == 2)
{
if (ee.EElinnum < (getWhere() / LINEINC) ||
ee.EElinnum > (endwhere / LINEINC)
)
return; // don't compile this function
ee.EEfunc = toSymbol(this);
}
}
if (fd.semanticRun >= PASS.obj) // if toObjFile() already run
return;
if (fd.type && fd.type.ty == Tfunction && (cast(TypeFunction)fd.type).next is null)
return;
// If errors occurred compiling it, such as https://issues.dlang.org/show_bug.cgi?id=6118
if (fd.type && fd.type.ty == Tfunction && (cast(TypeFunction)fd.type).next.ty == Terror)
return;
if (fd.hasSemantic3Errors)
return;
if (global.errors)
return;
if (!fd.fbody)
return;
if (fd.skipCodegen)
return;
UnitTestDeclaration ud = fd.isUnitTestDeclaration();
if (ud && !global.params.useUnitTests)
return;
if (multiobj && !fd.isStaticDtorDeclaration() && !fd.isStaticCtorDeclaration()
&& !(fd.isCrtCtor || fd.isCrtDtor))
{
obj_append(fd);
return;
}
if (fd.semanticRun == PASS.semanticdone)
{
/* What happened is this function failed semantic3() with errors,
* but the errors were gagged.
* Try to reproduce those errors, and then fail.
*/
.error(fd.loc, "%s `%s` errors compiling the function", fd.kind, fd.toPrettyChars);
return;
}
assert(fd.semanticRun == PASS.semantic3done);
assert(fd.ident != Id.empty);
for (FuncDeclaration fd2 = fd; fd2; )
{
if (fd2.inNonRoot())
return;
if (fd2.isNested())
fd2 = fd2.toParent2().isFuncDeclaration();
else
break;
}
if (UnitTestDeclaration udp = needsDeferredNested(fd))
{
/* Can't do unittest's out of order, they are order dependent in that their
* execution is done in lexical order.
*/
udp.deferredNested.push(fd);
//printf("%s @[%s]\n\t-. pushed to unittest @[%s]\n",
// fd.toPrettyChars(), fd.loc.toChars(), udp.loc.toChars());
return;
}
Symbol *s = toSymbol(fd); // may set skipCodegen
func_t *f = s.Sfunc;
if (fd.skipCodegen) // test it again, as toSymbol() might have set it
return;
// start code generation
fd.semanticRun = PASS.obj;
if (global.params.v.verbose)
message("function %s", fd.toPrettyChars());
// tunnel type of "this" to debug info generation
if (AggregateDeclaration ad = fd.parent.isAggregateDeclaration())
{
.type* t = Type_toCtype(ad.getType());
if (cd)
t = t.Tnext; // skip reference
f.Fclass = cast(Classsym *)t;
}
/* This is done so that the 'this' pointer on the stack is the same
* distance away from the function parameters, so that an overriding
* function can call the nested fdensure or fdrequire of its overridden function
* and the stack offsets are the same.
*/
if (fd.isVirtual() && (fd.fensure || fd.frequire))
f.Fflags3 |= Ffakeeh;
if (fd.hasNoEH())
// Same as config.ehmethod==EH_NONE, but only for this function
f.Fflags3 |= Feh_none;
s.Sclass = target.os == Target.OS.OSX ? SC.comdat : SC.global;
/* Make C static functions SCstatic
*/
if (fd.storage_class & STC.static_ && fd.isCsymbol())
s.Sclass = SC.static_;
for (Dsymbol p = fd.parent; p; p = p.parent)
{
if (p.isTemplateInstance())
{
// functions without D or C++ name mangling mixed in at global scope
// shouldn't have multiple definitions
const linkage = fd.resolvedLinkage();
if (p.isTemplateMixin() && (linkage == LINK.c || linkage == LINK.windows ||
linkage == LINK.objc))
{
const q = p.toParent();
if (q && q.isModule())
{
s.Sclass = SC.global;
break;
}
}
s.Sclass = SC.comdat;
break;
}
}
if (fd.inlinedNestedCallees)
{
/* https://issues.dlang.org/show_bug.cgi?id=15333
* If fd contains inlined expressions that come from
* nested function bodies, the enclosing of the functions must be
* generated first, in order to calculate correct frame pointer offset.
*/
foreach (fdc; *fd.inlinedNestedCallees)
{
FuncDeclaration fp = fdc.toParent2().isFuncDeclaration();
if (fp && fp.semanticRun < PASS.obj)
{
toObjFile(fp, multiobj);
}
}
}
if (fd.isNested())
{
//if (!(config.flags3 & CFG3pic))
// s.Sclass = SCstatic;
f.Fflags3 |= Fnested;
/* The enclosing function must have its code generated first,
* in order to calculate correct frame pointer offset.
*/
FuncDeclaration fdp = fd.toParent2().isFuncDeclaration();
if (fdp && fdp.semanticRun < PASS.obj)
{
toObjFile(fdp, multiobj);
}
}
else
{
if (entryPointFunctions(objmod, fd))
s.Sclass = SC.global;
}
symtab_t *symtabsave = cstate.CSpsymtab;
cstate.CSpsymtab = &f.Flocsym;
// Find module m for this function
Module m = null;
for (Dsymbol p = fd.parent; p; p = p.parent)
{
m = p.isModule();
if (m)
break;
}
Dsymbols deferToObj; // write these to OBJ file later
Array!(elem*) varsInScope;
Label*[void*] labels = null;
IRState irs = IRState(m, fd, &varsInScope, &deferToObj, &labels, &global.params, &target, global.errorSink);
Symbol *shidden = null;
Symbol *sthis = null;
tym_t tyf = tybasic(s.Stype.Tty);
//printf("linkage = %d, tyf = x%x\n", linkage, tyf);
int reverse = tyrevfunc(s.Stype.Tty);
assert(fd.type.ty == Tfunction);
TypeFunction tf = cast(TypeFunction)fd.type;
RET retmethod = retStyle(tf, fd.needThis());
if (retmethod == RET.stack)
{
// If function returns a struct, put a pointer to that
// as the first argument
.type *thidden = Type_toCtype(tf.next.pointerTo());
const hiddenparamLen = 5 + 10 + 1;
char[hiddenparamLen] hiddenparam = void;
__gshared uint hiddenparami; // how many we've generated so far
const(char)* name;
if (fd.isNRVO() && fd.nrvo_var)
name = fd.nrvo_var.ident.toChars();
else
{
snprintf(hiddenparam.ptr, hiddenparamLen, "__HID%u", ++hiddenparami);
name = hiddenparam.ptr;
}
shidden = symbol_name(name[0 .. strlen(name)], SC.parameter, thidden);
shidden.Sflags |= SFLtrue | SFLfree;
if (fd.isNRVO() && fd.nrvo_var && fd.nrvo_var.nestedrefs.length)
type_setcv(&shidden.Stype, shidden.Stype.Tty | mTYvolatile);
irs.shidden = shidden;
fd.shidden = shidden;
}
else
{
// Register return style cannot make nrvo.
// Auto functions keep the NRVO flag up to here,
// so we should eliminate it before entering backend.
fd.isNRVO = false;
}
if (fd.vthis)
{
assert(!fd.vthis.csym);
sthis = toSymbol(fd.vthis);
sthis.Stype = getParentClosureType(sthis, fd);
irs.sthis = sthis;
if (!(f.Fflags3 & Fnested))
f.Fflags3 |= Fmember;
}
// Estimate number of parameters, pi
size_t pi = (fd.v_arguments !is null);
if (fd.parameters)
pi += fd.parameters.length;
if (fd.objc.selector)
pi++; // Extra argument for Objective-C selector
// Create a temporary buffer, params[], to hold function parameters
Symbol*[10] paramsbuf = void;
Symbol **params = paramsbuf.ptr; // allocate on stack if possible
if (pi + 2 > paramsbuf.length) // allow extra 2 for sthis and shidden
{
params = cast(Symbol **)Mem.check(malloc((pi + 2) * (Symbol *).sizeof));
}
// Get the actual number of parameters, pi, and fill in the params[]
pi = 0;
if (fd.v_arguments)
{
params[pi] = toSymbol(fd.v_arguments);
pi += 1;
}
Symbol* lastParam;
if (fd.parameters)
{
foreach (i, v; *fd.parameters)
{
//printf("param[%d] = %p, %s\n", cast(int)i, v, v.toChars());
assert(!v.csym);
lastParam = toSymbol(v);
params[pi + i] = lastParam;
}
pi += fd.parameters.length;
}
if (reverse)
{
// Reverse params[] entries
foreach (i, sptmp; params[0 .. pi/2])
{
params[i] = params[pi - 1 - i];
params[pi - 1 - i] = sptmp;
}
}