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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176605 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index 7eb7202..35613b4 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -215,7 +215,7 @@
virtual void EmitFileDirective(StringRef Filename);
virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
- StringRef Filename);
+ StringRef Filename, unsigned CUID = 0);
virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa, unsigned Discriminator,
@@ -828,14 +828,14 @@
}
bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
- StringRef Filename) {
+ StringRef Filename, unsigned CUID) {
if (!UseDwarfDirectory && !Directory.empty()) {
if (sys::path::is_absolute(Filename))
- return EmitDwarfFileDirective(FileNo, "", Filename);
+ return EmitDwarfFileDirective(FileNo, "", Filename, CUID);
SmallString<128> FullPathName = Directory;
sys::path::append(FullPathName, Filename);
- return EmitDwarfFileDirective(FileNo, "", FullPathName);
+ return EmitDwarfFileDirective(FileNo, "", FullPathName, CUID);
}
if (UseLoc) {
@@ -846,8 +846,11 @@
}
PrintQuotedString(Filename, OS);
EmitEOL();
+ // All .file will belong to a single CUID.
+ CUID = 0;
}
- return this->MCStreamer::EmitDwarfFileDirective(FileNo, Directory, Filename);
+ return this->MCStreamer::EmitDwarfFileDirective(FileNo, Directory, Filename,
+ CUID);
}
void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,