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This commit is contained in:
Rui Ueyama 2020-10-14 18:58:47 +09:00
parent 8b8b210f6d
commit 626a370de1
3 changed files with 21 additions and 2 deletions
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2
chibild.h
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@ -22,6 +22,7 @@
#include <cstdlib> #include <cstdlib>
#include <cstdint> #include <cstdint>
#include <string> #include <string>
#include <unordered_set>
using llvm::ArrayRef; using llvm::ArrayRef;
using llvm::ErrorOr; using llvm::ErrorOr;
@ -173,6 +174,7 @@ public:
StringRef archive_name; StringRef archive_name;
int priority; int priority;
bool is_alive = false; bool is_alive = false;
std::unordered_set<ObjectFile *> liveness_edges;
private: private:
MemoryBufferRef mb; MemoryBufferRef mb;

2
input_files.cc
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@ -101,6 +101,8 @@ void ObjectFile::register_undefined_symbols() {
Symbol &sym = symbol_instances[i]; Symbol &sym = symbol_instances[i];
symbols[i] = symbol_table.get(sym.name); symbols[i] = symbol_table.get(sym.name);
if (symbols[i])
liveness_edges.insert(symbols[i]->file);
num_undefined++; num_undefined++;
} }
} }

19
main.cc
View File

@ -103,6 +103,15 @@ static std::vector<ObjectFile *> read_file(StringRef path) {
llvm::TimerGroup timers("all", "all"); llvm::TimerGroup timers("all", "all");
static void mark_live(ObjectFile *file) {
if (file->is_alive)
return;
file->is_alive = true;
for (ObjectFile *other : file->liveness_edges)
mark_live(other);
}
int main(int argc, char **argv) { int main(int argc, char **argv) {
MyOptTable opt_table; MyOptTable opt_table;
InputArgList args = opt_table.parse(argc - 1, argv + 1); InputArgList args = opt_table.parse(argc - 1, argv + 1);
@ -182,10 +191,16 @@ int main(int argc, char **argv) {
register_timer.stopTimer(); register_timer.stopTimer();
// Liveness propagation
for (ObjectFile *file : files)
if (file->archive_name == "")
mark_live(file);
// Remove archive members that weren't used by any other // Remove archive members that weren't used by any other
// object files. // object files.
std::remove_if(files.begin(), files.end(), files.erase(std::remove_if(files.begin(), files.end(),
[](ObjectFile *file) { return !file->is_alive; }); [](ObjectFile *file) { return !file->is_alive; }),
files.end());
// Create output sections // Create output sections
std::vector<OutputSection *> output_sections; std::vector<OutputSection *> output_sections;