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[Mach-O] wip

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This commit is contained in:
Rui Ueyama 2021-11-11 14:11:55 +09:00
parent 25a902c45a
commit 132dd7a7f2
1 changed files with 33 additions and 37 deletions
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70
macho/object-file.cc
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@ -25,7 +25,9 @@ ObjectFile *ObjectFile::create(Context &ctx, MappedFile<Context> *mf,
void ObjectFile::parse(Context &ctx) {
MachHeader &hdr = *(MachHeader *)mf->data;
u8 *p = mf->data + sizeof(hdr);
MachSection *unwind_sec = nullptr;
char *sym_strtab = nullptr;
// Read all but a symtab section
for (i64 i = 0; i < hdr.ncmds; i++) {
@ -54,7 +56,12 @@ void ObjectFile::parse(Context &ctx) {
}
break;
}
case LC_SYMTAB:
case LC_SYMTAB: {
SymtabCommand &cmd = *(SymtabCommand *)p;
mach_syms = {(MachSym *)(mf->data + cmd.symoff), cmd.nsyms};
sym_strtab = (char *)(mf->data + cmd.stroff);
break;
}
case LC_DYSYMTAB:
case LC_BUILD_VERSION:
case LC_VERSION_MIN_MACOSX:
@ -93,49 +100,38 @@ void ObjectFile::parse(Context &ctx) {
});
// Read a symtab section
p = mf->data + sizeof(hdr);
for (i64 i = 0; i < hdr.ncmds; i++) {
LoadCommand &lc = *(LoadCommand *)p;
if (lc.cmd != LC_SYMTAB) {
p += lc.cmdsize;
continue;
syms.reserve(mach_syms.size());
sym_to_subsec.reserve(mach_syms.size());
i64 nlocal = 0;
for (MachSym &msym : mach_syms)
if (!msym.ext)
nlocal++;
local_syms.reserve(nlocal);
for (MachSym &msym : mach_syms) {
std::string_view name = sym_strtab + msym.stroff;
if (msym.type == N_SECT)
sym_to_subsec.push_back(find_subsection_idx(ctx, msym.value));
else
sym_to_subsec.push_back(-1);
if (msym.ext) {
syms.push_back(intern(ctx, name));
} else {
local_syms.emplace_back(name);
syms.push_back(&local_syms.back());
override_symbol(ctx, syms.size() - 1);
}
SymtabCommand &cmd = *(SymtabCommand *)p;
mach_syms = {(MachSym *)(mf->data + cmd.symoff), cmd.nsyms};
syms.reserve(mach_syms.size());
sym_to_subsec.reserve(mach_syms.size());
i64 nlocal = 0;
for (MachSym &msym : mach_syms)
if (!msym.ext)
nlocal++;
local_syms.reserve(nlocal);
for (MachSym &msym : mach_syms) {
std::string_view name = (char *)(mf->data + cmd.stroff + msym.stroff);
if (msym.type == N_SECT)
sym_to_subsec.push_back(find_subsection_idx(ctx, msym.value));
else
sym_to_subsec.push_back(-1);
if (msym.ext) {
syms.push_back(intern(ctx, name));
} else {
local_syms.emplace_back(name);
syms.push_back(&local_syms.back());
override_symbol(ctx, syms.size() - 1);
}
}
break;
}
// Read relocations
for (std::unique_ptr<InputSection> &isec : sections)
if (isec)
isec->parse_relocations(ctx);
// Read __compact_unwindc
if (unwind_sec)
parse_compact_unwind(ctx, *unwind_sec);
}