static void
addsymtable(void)
{
IMAGE_SECTION_HEADER *h;
int i, size;
LSym *s;
fh.NumberOfSymbols = sizeof(symlabels)/sizeof(symlabels[0]);
size = nextsymoff + 4 + 18*fh.NumberOfSymbols;
h = addpesection(".symtab", size, size);
h->Characteristics = IMAGE_SCN_MEM_READ|
IMAGE_SCN_MEM_DISCARDABLE;
chksectoff(h, cpos());
fh.PointerToSymbolTable = cpos();
// put COFF symbol table
for (i=0; i<fh.NumberOfSymbols; i++) {
s = linkrlookup(ctxt, symlabels[i], 0);
strnput(s->name, 8);
lputl(datoff(s->value));
wputl(textsect);
wputl(0x0308); // "array of structs"
cput(2); // storage class: external
cput(0); // no aux entries
}
// put COFF string table
lputl(nextsymoff + 4);
for (i=0; i<nextsymoff; i++)
cput(symnames[i]);
strnput("", h->SizeOfRawData - size);
}
void
loadlib(void)
{
int i, w, x;
LSym *s, *gmsym;
char* cgostrsym;
if(flag_shared) {
s = linklookup(ctxt, "runtime.islibrary", 0);
s->dupok = 1;
adduint8(ctxt, s, 1);
}
loadinternal("runtime");
if(thechar == '5')
loadinternal("math");
if(flag_race)
loadinternal("runtime/race");
for(i=0; i<ctxt->libraryp; i++) {
if(debug['v'] > 1)
Bprint(&bso, "%5.2f autolib: %s (from %s)\n", cputime(), ctxt->library[i].file, ctxt->library[i].objref);
iscgo |= strcmp(ctxt->library[i].pkg, "runtime/cgo") == 0;
objfile(ctxt->library[i].file, ctxt->library[i].pkg);
}
if(linkmode == LinkExternal && !iscgo) {
// This indicates a user requested -linkmode=external.
// The startup code uses an import of runtime/cgo to decide
// whether to initialize the TLS. So give it one. This could
// be handled differently but it's an unusual case.
loadinternal("runtime/cgo");
// Pretend that we really imported the package.
s = linklookup(ctxt, "go.importpath.runtime/cgo.", 0);
s->type = SDATA;
s->dupok = 1;
s->reachable = 1;
// Provided by the code that imports the package.
// Since we are simulating the import, we have to provide this string.
cgostrsym = "go.string.\"runtime/cgo\"";
if(linkrlookup(ctxt, cgostrsym, 0) == nil)
addstrdata(cgostrsym, "runtime/cgo");
}
if(linkmode == LinkAuto) {
if(iscgo && externalobj)
linkmode = LinkExternal;
else
linkmode = LinkInternal;
}
if(linkmode == LinkInternal) {
// Drop all the cgo_import_static declarations.
// Turns out we won't be needing them.
for(s = ctxt->allsym; s != S; s = s->allsym)
if(s->type == SHOSTOBJ) {
// If a symbol was marked both
// cgo_import_static and cgo_import_dynamic,
// then we want to make it cgo_import_dynamic
// now.
if(s->extname != nil && s->dynimplib != nil && s->cgoexport == 0) {
s->type = SDYNIMPORT;
} else
s->type = 0;
}
}
gmsym = linklookup(ctxt, "runtime.tlsgm", 0);
gmsym->type = STLSBSS;
gmsym->size = 2*PtrSize;
gmsym->hide = 1;
gmsym->reachable = 1;
// Now that we know the link mode, trim the dynexp list.
x = CgoExportDynamic;
if(linkmode == LinkExternal)
x = CgoExportStatic;
w = 0;
for(i=0; i<ndynexp; i++)
if(dynexp[i]->cgoexport & x)
dynexp[w++] = dynexp[i];
ndynexp = w;
// In internal link mode, read the host object files.
if(linkmode == LinkInternal)
hostobjs();
else
hostlinksetup();
// We've loaded all the code now.
// If there are no dynamic libraries needed, gcc disables dynamic linking.
// Because of this, glibc's dynamic ELF loader occasionally (like in version 2.13)
// assumes that a dynamic binary always refers to at least one dynamic library.
// Rather than be a source of test cases for glibc, disable dynamic linking
// the same way that gcc would.
//
// Exception: on OS X, programs such as Shark only work with dynamic
// binaries, so leave it enabled on OS X (Mach-O) binaries.
// Also leave it enabled on Solaris which doesn't support
// statically linked binaries.
if(!flag_shared && !havedynamic && HEADTYPE != Hdarwin && HEADTYPE != Hsolaris)
debug['d'] = 1;
importcycles();
}
void
main(int argc, char *argv[])
{
linkarchinit();
ctxt = linknew(thelinkarch);
ctxt->thechar = thechar;
ctxt->thestring = thestring;
ctxt->diag = diag;
ctxt->bso = &bso;
Binit(&bso, 1, OWRITE);
listinit();
memset(debug, 0, sizeof(debug));
nerrors = 0;
outfile = nil;
HEADTYPE = -1;
INITTEXT = -1;
INITDAT = -1;
INITRND = -1;
INITENTRY = 0;
linkmode = LinkAuto;
nuxiinit();
if(thechar == '5' && ctxt->goarm == 5)
debug['F'] = 1;
flagcount("1", "use alternate profiling code", &debug['1']);
if(thechar == '6')
flagcount("8", "assume 64-bit addresses", &debug['8']);
flagfn1("B", "info: define ELF NT_GNU_BUILD_ID note", addbuildinfo);
flagint64("D", "addr: data address", &INITDAT);
flagstr("E", "sym: entry symbol", &INITENTRY);
if(thechar == '5')
flagcount("G", "debug pseudo-ops", &debug['G']);
flagfn1("I", "interp: set ELF interp", setinterp);
flagfn1("L", "dir: add dir to library path", Lflag);
flagfn1("H", "head: header type", setheadtype);
flagcount("K", "add stack underflow checks", &debug['K']);
if(thechar == '5')
flagcount("M", "disable software div/mod", &debug['M']);
flagcount("O", "print pc-line tables", &debug['O']);
flagcount("Q", "debug byte-register code gen", &debug['Q']);
if(thechar == '5')
flagcount("P", "debug code generation", &debug['P']);
flagint32("R", "rnd: address rounding", &INITRND);
flagcount("S", "check type signatures", &debug['S']);
flagint64("T", "addr: text address", &INITTEXT);
flagfn0("V", "print version and exit", doversion);
flagcount("W", "disassemble input", &debug['W']);
flagfn2("X", "name value: define string data", addstrdata);
flagcount("Z", "clear stack frame on entry", &debug['Z']);
flagcount("a", "disassemble output", &debug['a']);
flagcount("c", "dump call graph", &debug['c']);
flagcount("d", "disable dynamic executable", &debug['d']);
flagstr("extld", "linker to run in external mode", &extld);
flagstr("extldflags", "flags for external linker", &extldflags);
flagcount("f", "ignore version mismatch", &debug['f']);
flagcount("g", "disable go package data checks", &debug['g']);
flagstr("installsuffix", "pkg directory suffix", &flag_installsuffix);
flagstr("k", "sym: set field tracking symbol", &tracksym);
flagfn1("linkmode", "mode: set link mode (internal, external, auto)", setlinkmode);
flagcount("n", "dump symbol table", &debug['n']);
flagstr("o", "outfile: set output file", &outfile);
flagstr("r", "dir1:dir2:...: set ELF dynamic linker search path", &rpath);
flagcount("race", "enable race detector", &flag_race);
flagcount("s", "disable symbol table", &debug['s']);
if(thechar == '5' || thechar == '6')
flagcount("shared", "generate shared object (implies -linkmode external)", &flag_shared);
flagstr("tmpdir", "leave temporary files in this directory", &tmpdir);
flagcount("u", "reject unsafe packages", &debug['u']);
flagcount("v", "print link trace", &debug['v']);
flagcount("w", "disable DWARF generation", &debug['w']);
flagparse(&argc, &argv, usage);
ctxt->bso = &bso;
ctxt->debugdivmod = debug['M'];
ctxt->debugfloat = debug['F'];
ctxt->debughist = debug['O'];
ctxt->debugpcln = debug['O'];
ctxt->debugread = debug['W'];
ctxt->debugstack = debug['K'];
ctxt->debugvlog = debug['v'];
if(argc != 1)
usage();
if(outfile == nil) {
if(HEADTYPE == Hwindows)
outfile = smprint("%c.out.exe", thechar);
else
outfile = smprint("%c.out", thechar);
}
libinit(); // creates outfile
if(HEADTYPE == -1)
HEADTYPE = headtype(goos);
ctxt->headtype = HEADTYPE;
if (headstring == nil)
headstring = headstr(HEADTYPE);
archinit();
ctxt->debugfloat = debug['F'];
if(debug['v'])
Bprint(&bso, "HEADER = -H%d -T0x%llux -D0x%llux -R0x%ux\n",
HEADTYPE, INITTEXT, INITDAT, INITRND);
Bflush(&bso);
cbp = buf.cbuf;
cbc = sizeof(buf.cbuf);
addlibpath(ctxt, "command line", "command line", argv[0], "main");
loadlib();
if(thechar == '5') {
// mark some functions that are only referenced after linker code editing
if(debug['F'])
mark(linkrlookup(ctxt, "_sfloat", 0));
mark(linklookup(ctxt, "runtime.read_tls_fallback", 0));
}
deadcode();
callgraph();
paramspace = "SP"; /* (FP) now (SP) on output */
doelf();
if(HEADTYPE == Hdarwin)
domacho();
dostkcheck();
if(HEADTYPE == Hwindows)
dope();
addexport();
textaddress();
pclntab();
symtab();
dodata();
address();
doweak();
reloc();
asmb();
undef();
hostlink();
if(debug['v']) {
Bprint(&bso, "%5.2f cpu time\n", cputime());
Bprint(&bso, "%d symbols\n", ctxt->nsymbol);
Bprint(&bso, "%d sizeof adr\n", sizeof(Addr));
Bprint(&bso, "%d sizeof prog\n", sizeof(Prog));
Bprint(&bso, "%lld liveness data\n", liveness);
}
Bflush(&bso);
errorexit();
}