1 files changed, 100 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Object/SymbolSize.cpp b/contrib/llvm/lib/Object/SymbolSize.cpp
new file mode 100644
index 0000000..1d5cd78
--- /dev/null
+++ b/contrib/llvm/lib/Object/SymbolSize.cpp
@@ -0,0 +1,100 @@
+//===- SymbolSize.cpp -----------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/SymbolSize.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Object/COFF.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Object/MachO.h"
+
+using namespace llvm;
+using namespace object;
+
+namespace {
+struct SymEntry {
+  symbol_iterator I;
+  uint64_t Address;
+  unsigned Number;
+  unsigned SectionID;
+};
+}
+
+static int compareAddress(const SymEntry *A, const SymEntry *B) {
+  if (A->SectionID != B->SectionID)
+    return A->SectionID - B->SectionID;
+  return A->Address - B->Address;
+}
+
+static unsigned getSectionID(const ObjectFile &O, SectionRef Sec) {
+  if (auto *M = dyn_cast<MachOObjectFile>(&O))
+    return M->getSectionID(Sec);
+  return cast<COFFObjectFile>(O).getSectionID(Sec);
+}
+
+static unsigned getSymbolSectionID(const ObjectFile &O, SymbolRef Sym) {
+  if (auto *M = dyn_cast<MachOObjectFile>(&O))
+    return M->getSymbolSectionID(Sym);
+  return cast<COFFObjectFile>(O).getSymbolSectionID(Sym);
+}
+
+std::vector<std::pair<SymbolRef, uint64_t>>
+llvm::object::computeSymbolSizes(const ObjectFile &O) {
+  std::vector<std::pair<SymbolRef, uint64_t>> Ret;
+
+  if (const auto *E = dyn_cast<ELFObjectFileBase>(&O)) {
+    auto Syms = E->symbols();
+    if (Syms.begin() == Syms.end())
+      Syms = E->getDynamicSymbolIterators();
+    for (ELFSymbolRef Sym : Syms)
+      Ret.push_back({Sym, Sym.getSize()});
+    return Ret;
+  }
+
+  // Collect sorted symbol addresses. Include dummy addresses for the end
+  // of each section.
+  std::vector<SymEntry> Addresses;
+  unsigned SymNum = 0;
+  for (symbol_iterator I = O.symbol_begin(), E = O.symbol_end(); I != E; ++I) {
+    SymbolRef Sym = *I;
+    uint64_t Value = Sym.getValue();
+    Addresses.push_back({I, Value, SymNum, getSymbolSectionID(O, Sym)});
+    ++SymNum;
+  }
+  for (SectionRef Sec : O.sections()) {
+    uint64_t Address = Sec.getAddress();
+    uint64_t Size = Sec.getSize();
+    Addresses.push_back(
+        {O.symbol_end(), Address + Size, 0, getSectionID(O, Sec)});
+  }
+  array_pod_sort(Addresses.begin(), Addresses.end(), compareAddress);
+
+  // Compute the size as the gap to the next symbol
+  for (unsigned I = 0, N = Addresses.size() - 1; I < N; ++I) {
+    auto &P = Addresses[I];
+    if (P.I == O.symbol_end())
+      continue;
+
+    // If multiple symbol have the same address, give both the same size.
+    unsigned NextI = I + 1;
+    while (NextI < N && Addresses[NextI].Address == P.Address)
+      ++NextI;
+
+    uint64_t Size = Addresses[NextI].Address - P.Address;
+    P.Address = Size;
+  }
+
+  // Assign the sorted symbols in the original order.
+  Ret.resize(SymNum);
+  for (SymEntry &P : Addresses) {
+    if (P.I == O.symbol_end())
+      continue;
+    Ret[P.Number] = {*P.I, P.Address};
+  }
+  return Ret;
+}