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//===- MarkLive.cpp -------------------------------------------------------===//
// The LLVM Linker
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "Chunks.h"
#include "Symbols.h"
#include "llvm/ADT/STLExtras.h"
#include <vector>
namespace lld {
namespace coff {
// Set live bit on for each reachable chunk. Unmarked (unreachable)
// COMDAT chunks will be ignored by Writer, so they will be excluded
// from the final output.
void markLive(const std::vector<Chunk *> &Chunks) {
// We build up a worklist of sections which have been marked as live. We only
// push into the worklist when we discover an unmarked section, and we mark
// as we push, so sections never appear twice in the list.
SmallVector<SectionChunk *, 256> Worklist;
// COMDAT section chunks are dead by default. Add non-COMDAT chunks.
for (Chunk *C : Chunks)
if (auto *SC = dyn_cast<SectionChunk>(C))
if (SC->isLive())
auto Enqueue = [&](SectionChunk *C) {
if (C->isLive())
auto AddSym = [&](SymbolBody *B) {
if (auto *Sym = dyn_cast<DefinedRegular>(B))
else if (auto *Sym = dyn_cast<DefinedImportData>(B))
Sym->File->Live = true;
else if (auto *Sym = dyn_cast<DefinedImportThunk>(B))
Sym->WrappedSym->File->Live = true;
// Add GC root chunks.
for (SymbolBody *B : Config->GCRoot)
while (!Worklist.empty()) {
SectionChunk *SC = Worklist.pop_back_val();
// If this section was discarded, there are relocations referring to
// discarded sections. Ignore these sections to avoid crashing. They will be
// diagnosed during relocation processing.
if (SC->isDiscarded())
assert(SC->isLive() && "We mark as live when pushing onto the worklist!");
// Mark all symbols listed in the relocation table for this section.
for (SymbolBody *B : SC->symbols())
// Mark associative sections if any.
for (SectionChunk *C : SC->children())