1 //===- MCDisassembler.cpp - Disassembler interface ------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/MC/MCDisassembler/MCDisassembler.h" 10 #include "llvm/ADT/ArrayRef.h" 11 12 using namespace llvm; 13 14 MCDisassembler::~MCDisassembler() = default; 15 16 Optional<MCDisassembler::DecodeStatus> 17 MCDisassembler::onSymbolStart(SymbolInfoTy &Symbol, uint64_t &Size, 18 ArrayRef<uint8_t> Bytes, uint64_t Address, 19 raw_ostream &CStream) const { 20 return None; 21 } 22 23 uint64_t MCDisassembler::suggestBytesToSkip(ArrayRef<uint8_t> Bytes, 24 uint64_t Address) const { 25 return 1; 26 } 27 28 bool MCDisassembler::tryAddingSymbolicOperand(MCInst &Inst, int64_t Value, 29 uint64_t Address, bool IsBranch, 30 uint64_t Offset, uint64_t OpSize, 31 uint64_t InstSize) const { 32 if (Symbolizer) 33 return Symbolizer->tryAddingSymbolicOperand(Inst, *CommentStream, Value, 34 Address, IsBranch, Offset, 35 OpSize, InstSize); 36 return false; 37 } 38 39 void MCDisassembler::tryAddingPcLoadReferenceComment(int64_t Value, 40 uint64_t Address) const { 41 if (Symbolizer) 42 Symbolizer->tryAddingPcLoadReferenceComment(*CommentStream, Value, Address); 43 } 44 45 void MCDisassembler::setSymbolizer(std::unique_ptr<MCSymbolizer> Symzer) { 46 Symbolizer = std::move(Symzer); 47 } 48 49 #define SMC_PCASE(A, P) \ 50 case XCOFF::XMC_##A: \ 51 return P; 52 53 static uint8_t getSMCPriority(XCOFF::StorageMappingClass SMC) { 54 switch (SMC) { 55 SMC_PCASE(PR, 1) 56 SMC_PCASE(RO, 1) 57 SMC_PCASE(DB, 1) 58 SMC_PCASE(GL, 1) 59 SMC_PCASE(XO, 1) 60 SMC_PCASE(SV, 1) 61 SMC_PCASE(SV64, 1) 62 SMC_PCASE(SV3264, 1) 63 SMC_PCASE(TI, 1) 64 SMC_PCASE(TB, 1) 65 SMC_PCASE(RW, 1) 66 SMC_PCASE(TC0, 0) 67 SMC_PCASE(TC, 1) 68 SMC_PCASE(TD, 1) 69 SMC_PCASE(DS, 1) 70 SMC_PCASE(UA, 1) 71 SMC_PCASE(BS, 1) 72 SMC_PCASE(UC, 1) 73 SMC_PCASE(TL, 1) 74 SMC_PCASE(UL, 1) 75 SMC_PCASE(TE, 1) 76 #undef SMC_PCASE 77 } 78 return 0; 79 } 80 81 /// The function is for symbol sorting when symbols have the same address. 82 /// The symbols in the same section are sorted in ascending order. 83 /// llvm-objdump -D will choose the highest priority symbol to display when 84 /// there are symbols with the same address. 85 bool XCOFFSymbolInfo::operator<(const XCOFFSymbolInfo &SymInfo) const { 86 // Label symbols have higher priority than non-label symbols. 87 if (IsLabel != SymInfo.IsLabel) 88 return SymInfo.IsLabel; 89 90 // Symbols with a StorageMappingClass have higher priority than those without. 91 if (StorageMappingClass.has_value() != 92 SymInfo.StorageMappingClass.has_value()) 93 return SymInfo.StorageMappingClass.has_value(); 94 95 if (StorageMappingClass) { 96 return getSMCPriority(StorageMappingClass.value()) < 97 getSMCPriority(SymInfo.StorageMappingClass.value()); 98 } 99 100 return false; 101 } 102