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Encapsulate the DWARF string pool in a separate type.

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Pulls out some more code from some of the rather monolithic DWARF
classes. Unlike the address table, the string table won't move up into
DwarfDebug - each DWARF file has its own string table (but there can be
only one address table).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207277 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-04-25 21:34:35 +00:00
parent c87722ce4b
commit 891481f89d
8 changed files with 146 additions and 92 deletions
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65
lib/CodeGen/AsmPrinter/DwarfFile.cpp
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@@ -18,36 +18,11 @@
#include "llvm/Target/TargetLoweringObjectFile.h"
namespace llvm {
DwarfFile::DwarfFile(AsmPrinter *AP, const char *Pref, BumpPtrAllocator &DA)
: Asm(AP), StringPool(DA), NextStringPoolNumber(0), StringPref(Pref) {}
DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
: Asm(AP), StrPool(DA, *Asm, Pref) {}
DwarfFile::~DwarfFile() {}
MCSymbol *DwarfFile::getStringPoolSym() {
return Asm->GetTempSymbol(StringPref);
}
MCSymbol *DwarfFile::getStringPoolEntry(StringRef Str) {
std::pair<MCSymbol *, unsigned> &Entry =
StringPool.GetOrCreateValue(Str).getValue();
if (Entry.first)
return Entry.first;
Entry.second = NextStringPoolNumber++;
return Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
}
unsigned DwarfFile::getStringPoolIndex(StringRef Str) {
std::pair<MCSymbol *, unsigned> &Entry =
StringPool.GetOrCreateValue(Str).getValue();
if (Entry.first)
return Entry.second;
Entry.second = NextStringPoolNumber++;
Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
return Entry.second;
}
// Define a unique number for the abbreviation.
//
void DwarfFile::assignAbbrevNumber(DIEAbbrev &Abbrev) {
@@ -176,40 +151,6 @@ void DwarfFile::emitAbbrevs(const MCSection *Section) {
void DwarfFile::emitStrings(const MCSection *StrSection,
const MCSection *OffsetSection,
const MCSymbol *StrSecSym) {
if (StringPool.empty())
return;
// Start the dwarf str section.
Asm->OutStreamer.SwitchSection(StrSection);
// Get all of the string pool entries and put them in an array by their ID so
// we can sort them.
SmallVector<std::pair<unsigned, const StrPool::value_type *>, 64> Entries;
for (const auto &I : StringPool)
Entries.push_back(std::make_pair(I.second.second, &I));
array_pod_sort(Entries.begin(), Entries.end());
for (const auto &Entry : Entries) {
// Emit a label for reference from debug information entries.
Asm->OutStreamer.EmitLabel(Entry.second->getValue().first);
// Emit the string itself with a terminating null byte.
Asm->OutStreamer.EmitBytes(StringRef(Entry.second->getKeyData(),
Entry.second->getKeyLength() + 1));
}
// If we've got an offset section go ahead and emit that now as well.
if (OffsetSection) {
Asm->OutStreamer.SwitchSection(OffsetSection);
unsigned offset = 0;
unsigned size = 4; // FIXME: DWARF64 is 8.
for (const auto &Entry : Entries) {
Asm->OutStreamer.EmitIntValue(offset, size);
offset += Entry.second->getKeyLength() + 1;
}
}
StrPool.emit(*Asm, StrSection, OffsetSection, StrSecSym);
}
}