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/MCContext.cpp b/lib/MC/MCContext.cpp
index 1a7df60..26d378e 100644
--- a/lib/MC/MCContext.cpp
+++ b/lib/MC/MCContext.cpp
@@ -77,8 +77,8 @@
Symbols.clear();
Allocator.Reset();
Instances.clear();
- MCDwarfFiles.clear();
- MCDwarfDirs.clear();
+ MCDwarfFilesCUMap.clear();
+ MCDwarfDirsCUMap.clear();
MCGenDwarfLabelEntries.clear();
DwarfDebugFlags = StringRef();
MCLineSections.clear();
@@ -299,11 +299,13 @@
/// error and zero is returned and the client reports the error, else the
/// allocated file number is returned. The file numbers may be in any order.
unsigned MCContext::GetDwarfFile(StringRef Directory, StringRef FileName,
- unsigned FileNumber) {
+ unsigned FileNumber, unsigned CUID) {
// TODO: a FileNumber of zero says to use the next available file number.
// Note: in GenericAsmParser::ParseDirectiveFile() FileNumber was checked
// to not be less than one. This needs to be change to be not less than zero.
+ std::vector<MCDwarfFile *>& MCDwarfFiles = MCDwarfFilesCUMap[CUID];
+ std::vector<StringRef>& MCDwarfDirs = MCDwarfDirsCUMap[CUID];
// Make space for this FileNumber in the MCDwarfFiles vector if needed.
if (FileNumber >= MCDwarfFiles.size()) {
MCDwarfFiles.resize(FileNumber + 1);
@@ -363,7 +365,8 @@
/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it
/// currently is assigned and false otherwise.
-bool MCContext::isValidDwarfFileNumber(unsigned FileNumber) {
+bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) {
+ std::vector<MCDwarfFile *>& MCDwarfFiles = MCDwarfFilesCUMap[CUID];
if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
return false;