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DebugInfo: Improve reuse of file table entries in asm debug info

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The previous deduping strategy was woefully inadequate - it only
considered the most recent file used and avoided emitting a duplicate in
that case - never considering the a/b/a scenario.

It was also lacking when it came to directory paths as the previous
filename would never match the current if the filename had been split
into file and directory components.

This change builds caching functionality into the line table at the
lowest level in an optional form (a file number of 0 indicates that one
should be chosen and returned) and will eventually be reused by the
normal source level debugging DWARF emission.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204027 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-03-17 01:52:11 +00:00
parent 6a6b6f50af
commit fd69cf9ba4
9 changed files with 45 additions and 29 deletions
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6
include/llvm/MC/MCDwarf.h
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@@ -16,6 +16,7 @@
#define LLVM_MC_MCDWARF_H
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Dwarf.h"
@@ -179,8 +180,9 @@ struct MCDwarfLineTableHeader {
MCSymbol *Label;
SmallVector<std::string, 3> MCDwarfDirs;
SmallVector<MCDwarfFile, 3> MCDwarfFiles;
StringMap<unsigned> SourceIdMap;
MCDwarfLineTableHeader() : Label(nullptr) {}
unsigned getFile(StringRef Directory, StringRef FileName, unsigned FileNumber);
unsigned getFile(StringRef Directory, StringRef FileName, unsigned FileNumber = 0);
std::pair<MCSymbol *, MCSymbol *> Emit(MCStreamer *MCOS) const;
};
@@ -195,7 +197,7 @@ public:
// This emits the Dwarf file and the line tables for a given Compile Unit.
const MCSymbol *EmitCU(MCStreamer *MCOS) const;
unsigned getFile(StringRef Directory, StringRef FileName, unsigned FileNumber);
unsigned getFile(StringRef Directory, StringRef FileName, unsigned FileNumber = 0);
MCSymbol *getLabel() const {
return Header.Label;