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annotate lib/Object/SymbolSize.cpp @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents afa8332a0e37
children c2174574ed3a
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1 //===- SymbolSize.cpp -----------------------------------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "llvm/Object/SymbolSize.h"
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11 #include "llvm/ADT/STLExtras.h"
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12 #include "llvm/Object/COFF.h"
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13 #include "llvm/Object/ELFObjectFile.h"
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14 #include "llvm/Object/MachO.h"
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15
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16 using namespace llvm;
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17 using namespace object;
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18
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19 // Orders increasingly by (SectionID, Address).
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20 int llvm::object::compareAddress(const SymEntry *A, const SymEntry *B) {
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21 if (A->SectionID != B->SectionID)
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22 return A->SectionID < B->SectionID ? -1 : 1;
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23 if (A->Address != B->Address)
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24 return A->Address < B->Address ? -1 : 1;
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25 return 0;
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26 }
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27
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28 static unsigned getSectionID(const ObjectFile &O, SectionRef Sec) {
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29 if (auto *M = dyn_cast<MachOObjectFile>(&O))
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30 return M->getSectionID(Sec);
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31 return cast<COFFObjectFile>(O).getSectionID(Sec);
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32 }
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33
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34 static unsigned getSymbolSectionID(const ObjectFile &O, SymbolRef Sym) {
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35 if (auto *M = dyn_cast<MachOObjectFile>(&O))
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36 return M->getSymbolSectionID(Sym);
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37 return cast<COFFObjectFile>(O).getSymbolSectionID(Sym);
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38 }
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39
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40 std::vector<std::pair<SymbolRef, uint64_t>>
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41 llvm::object::computeSymbolSizes(const ObjectFile &O) {
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42 std::vector<std::pair<SymbolRef, uint64_t>> Ret;
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43
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44 if (const auto *E = dyn_cast<ELFObjectFileBase>(&O)) {
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45 auto Syms = E->symbols();
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46 if (Syms.begin() == Syms.end())
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47 Syms = E->getDynamicSymbolIterators();
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48 for (ELFSymbolRef Sym : Syms)
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49 Ret.push_back({Sym, Sym.getSize()});
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50 return Ret;
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51 }
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52
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53 // Collect sorted symbol addresses. Include dummy addresses for the end
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54 // of each section.
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55 std::vector<SymEntry> Addresses;
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56 unsigned SymNum = 0;
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57 for (symbol_iterator I = O.symbol_begin(), E = O.symbol_end(); I != E; ++I) {
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58 SymbolRef Sym = *I;
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59 uint64_t Value = Sym.getValue();
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60 Addresses.push_back({I, Value, SymNum, getSymbolSectionID(O, Sym)});
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61 ++SymNum;
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62 }
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63 for (SectionRef Sec : O.sections()) {
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64 uint64_t Address = Sec.getAddress();
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65 uint64_t Size = Sec.getSize();
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66 Addresses.push_back(
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67 {O.symbol_end(), Address + Size, 0, getSectionID(O, Sec)});
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68 }
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69 array_pod_sort(Addresses.begin(), Addresses.end(), compareAddress);
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70
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71 // Compute the size as the gap to the next symbol
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72 for (unsigned I = 0, N = Addresses.size() - 1; I < N; ++I) {
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73 auto &P = Addresses[I];
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74 if (P.I == O.symbol_end())
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75 continue;
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76
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77 // If multiple symbol have the same address, give both the same size.
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78 unsigned NextI = I + 1;
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79 while (NextI < N && Addresses[NextI].Address == P.Address)
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80 ++NextI;
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81
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82 uint64_t Size = Addresses[NextI].Address - P.Address;
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83 P.Address = Size;
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84 }
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85
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86 // Assign the sorted symbols in the original order.
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87 Ret.resize(SymNum);
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88 for (SymEntry &P : Addresses) {
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89 if (P.I == O.symbol_end())
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90 continue;
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91 Ret[P.Number] = {*P.I, P.Address};
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92 }
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93 return Ret;
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94 }