1 //===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCAssembler.h"
11 #include "llvm/MC/MCExpr.h"
12 #include "llvm/MC/MCObjectWriter.h"
13 #include "llvm/MC/MCSymbol.h"
17 MCObjectWriter::~MCObjectWriter() {
20 /// Utility function to encode a SLEB128 value.
21 void MCObjectWriter::EncodeSLEB128(int64_t Value, raw_ostream &OS) {
24 uint8_t Byte = Value & 0x7f;
25 // NOTE: this assumes that this signed shift is an arithmetic right shift.
27 More = !((((Value == 0 ) && ((Byte & 0x40) == 0)) ||
28 ((Value == -1) && ((Byte & 0x40) != 0))));
30 Byte |= 0x80; // Mark this byte that that more bytes will follow.
35 /// Utility function to encode a ULEB128 value.
36 void MCObjectWriter::EncodeULEB128(uint64_t Value, raw_ostream &OS,
39 uint8_t Byte = Value & 0x7f;
41 if (Value != 0 || Padding != 0)
42 Byte |= 0x80; // Mark this byte that that more bytes will follow.
46 // Pad with 0x80 and emit a null byte at the end.
48 for (; Padding != 1; --Padding)
55 MCObjectWriter::IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm,
56 const MCSymbolRefExpr *A,
57 const MCSymbolRefExpr *B,
59 // Modified symbol references cannot be resolved.
60 if (A->getKind() != MCSymbolRefExpr::VK_None ||
61 B->getKind() != MCSymbolRefExpr::VK_None)
64 const MCSymbol &SA = A->getSymbol();
65 const MCSymbol &SB = B->getSymbol();
66 if (SA.AliasedSymbol().isUndefined() || SB.AliasedSymbol().isUndefined())
69 const MCSymbolData &DataA = Asm.getSymbolData(SA);
70 const MCSymbolData &DataB = Asm.getSymbolData(SB);
72 return IsSymbolRefDifferenceFullyResolvedImpl(Asm, DataA,
79 MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
80 const MCSymbolData &DataA,
84 const MCSection &SecA = DataA.getSymbol().AliasedSymbol().getSection();
85 const MCSection &SecB = FB.getParent()->getSection();
86 // On ELF and COFF A - B is absolute if A and B are in the same section.
87 return &SecA == &SecB;