//===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCObjectWriter.h" #include "llvm/MC/MCSymbol.h" using namespace llvm; MCObjectWriter::~MCObjectWriter() { } /// Utility function to encode a SLEB128 value. void MCObjectWriter::EncodeSLEB128(int64_t Value, raw_ostream &OS) { bool More; do { uint8_t Byte = Value & 0x7f; // NOTE: this assumes that this signed shift is an arithmetic right shift. Value >>= 7; More = !((((Value == 0 ) && ((Byte & 0x40) == 0)) || ((Value == -1) && ((Byte & 0x40) != 0)))); if (More) Byte |= 0x80; // Mark this byte that that more bytes will follow. OS << char(Byte); } while (More); } /// Utility function to encode a ULEB128 value. void MCObjectWriter::EncodeULEB128(uint64_t Value, raw_ostream &OS) { do { uint8_t Byte = Value & 0x7f; Value >>= 7; if (Value != 0) Byte |= 0x80; // Mark this byte that that more bytes will follow. OS << char(Byte); } while (Value != 0); } bool MCObjectWriter::IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm, const MCSymbolRefExpr *A, const MCSymbolRefExpr *B, bool InSet) const { // Modified symbol references cannot be resolved. if (A->getKind() != MCSymbolRefExpr::VK_None || B->getKind() != MCSymbolRefExpr::VK_None) return false; const MCSymbol &SA = A->getSymbol(); const MCSymbol &SB = B->getSymbol(); if (SA.isUndefined() || SB.isUndefined()) return false; // On ELF and COFF A - B is absolute if A and B are in the same section. return &SA.getSection() == &SB.getSection(); }