Debug Info: store the files and directories for each compile unit.
We now emit a line table for each compile unit. To reduce the prologue size
of each line table, the files and directories used by each compile unit are
stored in std::map<unsigned, std::vector< > > instead of std::vector< >.
The prologue for a lto'ed image can be as big as 93K. Duplicating 93K for each
compile unit causes a huge increase of debug info. With this patch, each
prologue will only emit the files required by the compile unit.
rdar://problem/13342023
llvm-svn: 176605
diff --git a/llvm/lib/MC/MCNullStreamer.cpp b/llvm/lib/MC/MCNullStreamer.cpp
index 89f74c1..c872b22 100644
--- a/llvm/lib/MC/MCNullStreamer.cpp
+++ b/llvm/lib/MC/MCNullStreamer.cpp
@@ -89,7 +89,7 @@
virtual void EmitFileDirective(StringRef Filename) {}
virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
- StringRef Filename) {
+ StringRef Filename, unsigned CUID = 0) {
return false;
}
virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,