1 //===- SymbolSize.cpp -----------------------------------------------------===//
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/Object/SymbolSize.h"
11 #include "llvm/ADT/STLExtras.h"
12 #include "llvm/Object/ELFObjectFile.h"
15 using namespace object;
26 static int compareAddress(const SymEntry *A, const SymEntry *B) {
27 if (A->Section == B->Section)
28 return A->Address - B->Address;
29 if (A->Section < B->Section)
34 static int compareNumber(const SymEntry *A, const SymEntry *B) {
35 return A->Number - B->Number;
38 ErrorOr<std::vector<std::pair<SymbolRef, uint64_t>>>
39 llvm::object::computeSymbolSizes(const ObjectFile &O) {
40 std::vector<std::pair<SymbolRef, uint64_t>> Ret;
42 if (isa<ELFObjectFileBase>(&O)) {
43 for (SymbolRef Sym : O.symbols()) {
44 Ret.push_back({Sym, Sym.getSize()});
49 // Collect sorted symbol addresses. Include dummy addresses for the end
51 std::vector<SymEntry> Addresses;
53 for (symbol_iterator I = O.symbol_begin(), E = O.symbol_end(); I != E; ++I) {
56 if (std::error_code EC = Sym.getAddress(Address))
58 section_iterator SecI = O.section_end();
59 if (std::error_code EC = Sym.getSection(SecI))
61 Addresses.push_back({I, Address, SymNum, *SecI});
64 for (const SectionRef Sec : O.sections()) {
65 uint64_t Address = Sec.getAddress();
66 uint64_t Size = Sec.getSize();
67 Addresses.push_back({O.symbol_end(), Address + Size, 0, Sec});
69 array_pod_sort(Addresses.begin(), Addresses.end(), compareAddress);
71 // Compute the size as the gap to the next symbol
72 for (unsigned I = 0, N = Addresses.size() - 1; I < N; ++I) {
73 auto &P = Addresses[I];
74 if (P.I == O.symbol_end())
76 uint64_t Size = Addresses[I + 1].Address - P.Address;
80 // Put back in the original order and copy the result
81 array_pod_sort(Addresses.begin(), Addresses.end(), compareNumber);
82 for (SymEntry &P : Addresses) {
83 if (P.I == O.symbol_end())
85 Ret.push_back({*P.I, P.Address});