LCOV - code coverage report
Current view: top level - lib/CodeGen/AsmPrinter - AddressPool.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 27 27 100.0 %
Date: 2018-09-23 13:06:45 Functions: 3 3 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- llvm/CodeGen/AddressPool.cpp - Dwarf Debug Framework ---------------===//
       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"
      11             : #include "llvm/ADT/SmallVector.h"
      12             : #include "llvm/CodeGen/AsmPrinter.h"
      13             : #include "llvm/IR/DataLayout.h"
      14             : #include "llvm/MC/MCStreamer.h"
      15             : #include "llvm/Target/TargetLoweringObjectFile.h"
      16             : #include <utility>
      17             : 
      18             : using namespace llvm;
      19             : 
      20        9065 : unsigned AddressPool::getIndex(const MCSymbol *Sym, bool TLS) {
      21        9065 :   HasBeenUsed = true;
      22             :   auto IterBool =
      23       18130 :       Pool.insert(std::make_pair(Sym, AddressPoolEntry(Pool.size(), TLS)));
      24        9065 :   return IterBool.first->second.Number;
      25             : }
      26             : 
      27             : 
      28           6 : void AddressPool::emitHeader(AsmPrinter &Asm, MCSection *Section) {
      29           6 :   static const uint8_t AddrSize = Asm.getDataLayout().getPointerSize();
      30             :   uint64_t Length = sizeof(uint16_t) // version
      31             :                   + sizeof(uint8_t)  // address_size
      32             :                   + sizeof(uint8_t)  // segment_selector_size
      33           6 :                   + AddrSize * Pool.size(); // entries
      34           6 :   Asm.emitInt32(Length); // TODO: Support DWARF64 format.
      35           6 :   Asm.emitInt16(Asm.getDwarfVersion());
      36           6 :   Asm.emitInt8(AddrSize);
      37           6 :   Asm.emitInt8(0); // TODO: Support non-zero segment_selector_size.
      38           6 : }
      39             : 
      40             : // Emit addresses into the section given.
      41         571 : void AddressPool::emit(AsmPrinter &Asm, MCSection *AddrSection) {
      42             :   // Start the dwarf addr section.
      43         571 :   Asm.OutStreamer->SwitchSection(AddrSection);
      44             : 
      45         571 :   if (Asm.getDwarfVersion() >= 5)
      46           6 :     emitHeader(Asm, AddrSection);
      47             : 
      48             :   // Define the symbol that marks the start of the contribution.
      49             :   // It is referenced via DW_AT_addr_base.
      50         571 :   Asm.OutStreamer->EmitLabel(AddressTableBaseSym);
      51             : 
      52         571 :   if (Pool.empty())
      53           3 :     return;
      54             : 
      55             :   // Order the address pool entries by ID
      56         568 :   SmallVector<const MCExpr *, 64> Entries(Pool.size());
      57             : 
      58        9564 :   for (const auto &I : Pool)
      59       17992 :     Entries[I.second.Number] =
      60        8996 :         I.second.TLS
      61        8996 :             ? Asm.getObjFileLowering().getDebugThreadLocalSymbol(I.first)
      62        8992 :             : MCSymbolRefExpr::create(I.first, Asm.OutContext);
      63             : 
      64        9564 :   for (const MCExpr *Entry : Entries)
      65        8996 :     Asm.OutStreamer->EmitValue(Entry, Asm.getDataLayout().getPointerSize());
      66             : }

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