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📄 Chunks.cpp(31.9 KB)
📄 Chunks.h(22.6 KB)
📄 Config.h(6.76 KB)
📄 DLL.cpp(23.61 KB)
📄 DLL.h(2.25 KB)
📄 DebugTypes.cpp(18.17 KB)
📄 DebugTypes.h(2.44 KB)
📄 Driver.cpp(68.73 KB)
📄 Driver.h(7.09 KB)
📄 DriverUtils.cpp(29.99 KB)
📄 ICF.cpp(10.91 KB)
📄 ICF.h(612 B)
📄 InputFiles.cpp(37.9 KB)
📄 InputFiles.h(12.92 KB)
📄 LLDMapFile.cpp(4.11 KB)
📄 LLDMapFile.h(599 B)
📄 LTO.cpp(7.34 KB)
📄 LTO.h(1.54 KB)
📄 MapFile.cpp(10.44 KB)
📄 MapFile.h(590 B)
📄 MarkLive.cpp(2.28 KB)
📄 MarkLive.h(648 B)
📄 MinGW.cpp(4.89 KB)
📄 MinGW.h(1.03 KB)
📄 Options.td(12.29 KB)
📄 PDB.cpp(58.35 KB)
📄 PDB.h(1.01 KB)
📄 README.md(20 B)
📄 SymbolTable.cpp(26.37 KB)
📄 SymbolTable.h(4.98 KB)
📄 Symbols.cpp(4.38 KB)
📄 Symbols.h(14.85 KB)
📄 TypeMerger.h(2.24 KB)
📄 Writer.cpp(70.38 KB)
📄 Writer.h(2.57 KB)

Editing: MarkLive.cpp

//===- MarkLive.cpp -------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "Chunks.h"
#include "Symbols.h"
#include "lld/Common/Timer.h"
#include "llvm/ADT/STLExtras.h"
#include <vector>

namespace lld {
namespace coff {

static Timer gctimer("GC", Timer::root());

// 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(ArrayRef<Chunk *> chunks) {
  ScopedTimer t(gctimer);

// 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. Do not
  // traverse DWARF sections. They are live, but they should not keep other
  // sections alive.
  for (Chunk *c : chunks)
    if (auto *sc = dyn_cast<SectionChunk>(c))
      if (sc->live && !sc->isDWARF())
        worklist.push_back(sc);

auto enqueue = [&](SectionChunk *c) {
    if (c->live)
      return;
    c->live = true;
    worklist.push_back(c);
  };

auto addSym = [&](Symbol *b) {
    if (auto *sym = dyn_cast<DefinedRegular>(b))
      enqueue(sym->getChunk());
    else if (auto *sym = dyn_cast<DefinedImportData>(b))
      sym->file->live = true;
    else if (auto *sym = dyn_cast<DefinedImportThunk>(b))
      sym->wrappedSym->file->live = sym->wrappedSym->file->thunkLive = true;
  };

// Add GC root chunks.
  for (Symbol *b : config->gcroot)
    addSym(b);

while (!worklist.empty()) {
    SectionChunk *sc = worklist.pop_back_val();
    assert(sc->live && "We mark as live when pushing onto the worklist!");

// Mark all symbols listed in the relocation table for this section.
    for (Symbol *b : sc->symbols())
      if (b)
        addSym(b);

// Mark associative sections if any.
    for (SectionChunk &c : sc->children())
      enqueue(&c);
  }
}

}
}

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Editing: MarkLive.cpp

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