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122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
//===- SymbolSize.cpp -----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/SymbolSize.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/Wasm.h"
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#include "llvm/Object/XCOFFObjectFile.h"
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using namespace llvm;
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using namespace object;
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// Orders increasingly by (SectionID, Address).
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int llvm::object::compareAddress(const SymEntry *A, const SymEntry *B) {
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if (A->SectionID != B->SectionID)
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return A->SectionID < B->SectionID ? -1 : 1;
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if (A->Address != B->Address)
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return A->Address < B->Address ? -1 : 1;
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return 0;
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}
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static unsigned getSectionID(const ObjectFile &O, SectionRef Sec) {
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if (auto *M = dyn_cast<MachOObjectFile>(&O))
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return M->getSectionID(Sec);
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if (isa<WasmObjectFile>(&O))
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return Sec.getIndex();
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if (isa<XCOFFObjectFile>(&O))
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return Sec.getIndex();
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return cast<COFFObjectFile>(O).getSectionID(Sec);
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}
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static unsigned getSymbolSectionID(const ObjectFile &O, SymbolRef Sym) {
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if (auto *M = dyn_cast<MachOObjectFile>(&O))
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return M->getSymbolSectionID(Sym);
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if (const auto *M = dyn_cast<WasmObjectFile>(&O))
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return M->getSymbolSectionId(Sym);
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if (const auto *M = dyn_cast<XCOFFObjectFile>(&O))
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return M->getSymbolSectionID(Sym);
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return cast<COFFObjectFile>(O).getSymbolSectionID(Sym);
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}
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std::vector<std::pair<SymbolRef, uint64_t>>
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llvm::object::computeSymbolSizes(const ObjectFile &O) {
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std::vector<std::pair<SymbolRef, uint64_t>> Ret;
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if (const auto *E = dyn_cast<ELFObjectFileBase>(&O)) {
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auto Syms = E->symbols();
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if (Syms.empty())
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Syms = E->getDynamicSymbolIterators();
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for (ELFSymbolRef Sym : Syms)
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Ret.push_back({Sym, Sym.getSize()});
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return Ret;
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}
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if (const auto *E = dyn_cast<XCOFFObjectFile>(&O)) {
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for (XCOFFSymbolRef Sym : E->symbols())
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Ret.push_back({Sym, Sym.getSize()});
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return Ret;
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}
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// Collect sorted symbol addresses. Include dummy addresses for the end
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// of each section.
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std::vector<SymEntry> Addresses;
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unsigned SymNum = 0;
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for (symbol_iterator I = O.symbol_begin(), E = O.symbol_end(); I != E; ++I) {
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SymbolRef Sym = *I;
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Expected<uint64_t> ValueOrErr = Sym.getValue();
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if (!ValueOrErr)
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// TODO: Actually report errors helpfully.
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report_fatal_error(ValueOrErr.takeError());
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Addresses.push_back({I, *ValueOrErr, SymNum, getSymbolSectionID(O, Sym)});
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++SymNum;
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}
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for (SectionRef Sec : O.sections()) {
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uint64_t Address = Sec.getAddress();
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uint64_t Size = Sec.getSize();
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Addresses.push_back(
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{O.symbol_end(), Address + Size, 0, getSectionID(O, Sec)});
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}
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if (Addresses.empty())
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return Ret;
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array_pod_sort(Addresses.begin(), Addresses.end(), compareAddress);
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// Compute the size as the gap to the next symbol. If multiple symbols have
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// the same address, give both the same size. Because Addresses is sorted,
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// use two pointers to keep track of the current symbol vs. the next symbol
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// that doesn't have the same address for size computation.
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for (unsigned I = 0, NextI = 0, N = Addresses.size() - 1; I < N; ++I) {
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auto &P = Addresses[I];
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if (P.I == O.symbol_end())
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continue;
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// If the next pointer is behind, update it to the next symbol.
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if (NextI <= I) {
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NextI = I + 1;
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while (NextI < N && Addresses[NextI].Address == P.Address)
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++NextI;
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}
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uint64_t Size = Addresses[NextI].Address - P.Address;
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P.Address = Size;
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}
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// Assign the sorted symbols in the original order.
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Ret.resize(SymNum);
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for (SymEntry &P : Addresses) {
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if (P.I == O.symbol_end())
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continue;
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Ret[P.Number] = {*P.I, P.Address};
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}
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return Ret;
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}
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