LLVM  4.0.0
AddressPool.cpp
Go to the documentation of this file.
1 //===-- llvm/CodeGen/AddressPool.cpp - Dwarf Debug Framework ---*- C++ -*--===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "AddressPool.h"
12 #include "llvm/MC/MCStreamer.h"
14 
15 using namespace llvm;
16 
17 unsigned AddressPool::getIndex(const MCSymbol *Sym, bool TLS) {
18  HasBeenUsed = true;
19  auto IterBool =
20  Pool.insert(std::make_pair(Sym, AddressPoolEntry(Pool.size(), TLS)));
21  return IterBool.first->second.Number;
22 }
23 
24 // Emit addresses into the section given.
25 void AddressPool::emit(AsmPrinter &Asm, MCSection *AddrSection) {
26  if (Pool.empty())
27  return;
28 
29  // Start the dwarf addr section.
30  Asm.OutStreamer->SwitchSection(AddrSection);
31 
32  // Order the address pool entries by ID
33  SmallVector<const MCExpr *, 64> Entries(Pool.size());
34 
35  for (const auto &I : Pool)
36  Entries[I.second.Number] =
37  I.second.TLS
39  : MCSymbolRefExpr::create(I.first, Asm.OutContext);
40 
41  for (const MCExpr *Entry : Entries)
42  Asm.OutStreamer->EmitValue(Entry, Asm.getDataLayout().getPointerSize());
43 }
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:40
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:84
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:298
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:39
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:148
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:79
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:34
virtual const MCExpr * getDebugThreadLocalSymbol(const MCSymbol *Sym) const
Create a symbol reference to describe the given TLS variable when emitting the address in debug info...
void emit(AsmPrinter &Asm, MCSection *AddrSection)
Definition: AddressPool.cpp:25
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:67
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:843
#define I(x, y, z)
Definition: MD5.cpp:54
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:144
unsigned getPointerSize(unsigned AS=0) const
Layout pointer size FIXME: The defaults need to be removed once all of the backends/clients are updat...
Definition: DataLayout.cpp:608
unsigned getIndex(const MCSymbol *Sym, bool TLS=false)
Returns the index into the address pool with the given label/symbol.
Definition: AddressPool.cpp:17