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7521964d28
This starts merging MCSection and MCSectionData. There are a few issues with the current split between MCSection and MCSectionData. * It optimizes the the not as important case. We want the production of .o files to be really fast, but the split puts the information used for .o emission in a separate data structure. * The ELF/COFF/MachO hierarchy is not represented in MCSectionData, leading to some ad-hoc ways to represent the various flags. * It makes it harder to remember where each item is. The attached patch starts merging the two by moving the alignment from MCSectionData to MCSection. Most of the patch is actually just dropping 'const', since MCSectionData is mutable, but MCSection was not. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237936 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===-- llvm/CodeGen/DwarfStringPool.cpp - Dwarf Debug Framework ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfStringPool.h"
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#include "llvm/MC/MCStreamer.h"
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using namespace llvm;
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static std::pair<MCSymbol *, unsigned> &
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getEntry(AsmPrinter &Asm,
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StringMap<std::pair<MCSymbol *, unsigned>, BumpPtrAllocator &> &Pool,
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StringRef Prefix, StringRef Str) {
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std::pair<MCSymbol *, unsigned> &Entry = Pool[Str];
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if (!Entry.first) {
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Entry.second = Pool.size() - 1;
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Entry.first = Asm.createTempSymbol(Prefix);
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}
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return Entry;
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}
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MCSymbol *DwarfStringPool::getSymbol(AsmPrinter &Asm, StringRef Str) {
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return getEntry(Asm, Pool, Prefix, Str).first;
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}
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unsigned DwarfStringPool::getIndex(AsmPrinter &Asm, StringRef Str) {
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return getEntry(Asm, Pool, Prefix, Str).second;
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}
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void DwarfStringPool::emit(AsmPrinter &Asm, MCSection *StrSection,
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MCSection *OffsetSection) {
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if (Pool.empty())
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return;
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// Start the dwarf str section.
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Asm.OutStreamer->SwitchSection(StrSection);
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// Get all of the string pool entries and put them in an array by their ID so
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// we can sort them.
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SmallVector<const StringMapEntry<std::pair<MCSymbol *, unsigned>> *, 64>
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Entries(Pool.size());
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for (const auto &E : Pool)
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Entries[E.getValue().second] = &E;
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for (const auto &Entry : Entries) {
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// Emit a label for reference from debug information entries.
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Asm.OutStreamer->EmitLabel(Entry->getValue().first);
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// Emit the string itself with a terminating null byte.
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Asm.OutStreamer->EmitBytes(
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StringRef(Entry->getKeyData(), Entry->getKeyLength() + 1));
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}
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// If we've got an offset section go ahead and emit that now as well.
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if (OffsetSection) {
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Asm.OutStreamer->SwitchSection(OffsetSection);
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unsigned offset = 0;
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unsigned size = 4; // FIXME: DWARF64 is 8.
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for (const auto &Entry : Entries) {
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Asm.OutStreamer->EmitIntValue(offset, size);
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offset += Entry->getKeyLength() + 1;
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}
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}
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}
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