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[Mach-O] wip

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This commit is contained in:
Rui Ueyama 2021-10-13 07:28:09 +09:00
parent 2fcbb582ed
commit f8ff631605
1 changed files with 29 additions and 1 deletions
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30
macho/output-chunks.cc
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@ -734,7 +734,35 @@ void UnwindEncoder::finish(Context &ctx) {
src[i].encoding | encode_personality(ctx, src[i].personality);
}
std::vector<std::span<Entry>> entries = split_entries(dst);
std::vector<Page>> pages = split_entries(dst);
// Allocate a buffer that is more than large enough to hold the
// entire section contents.
buf.resize(src.size() * 8 + 1024);
// Write the section header.
UnwindSectionHeader &hdr = *(UnwindSectionHeader *)buf.data();
hdr.version = UNWIND_SECTION_VERSION;
hdr.encoding_offset = 0;
hdr.encoding_count = 0;
hdr.personality_offset = sizeof(hdr);
hdr.personality_count = personalities.size();
hdr.index_offset = sizeof(hdr) + personalities.size() * 4;
hdr.index_count = entries.size();
// Write the personalities
u32 *per = (u32 *)(buf.data() + sizeof(hdr));
for (Symbol *sym : personalities)
*per++ = sym->get_addr(ctx);
// Write page headers
UnwindPageHeader *phdr = (UnwindPageHeader *)per;
for (std::span<Entry> ent : entries) {
phdr->kind = UNWIND_SECOND_LEVEL_COMPRESSED;
phdr->page_offset = sizeof(*phdr);
phdr->page_count = ent.size();
phdr->encoding_offset = sizeof(*phdr);
}
}
u32 UnwindEncoder::encode_personality(Context &ctx, Symbol *sym) {