Extract an utility for computing symbol sizes on MachO and COFF.

I will add a second user in the next commit.

llvm-svn: 240366

1 files changed, 8 insertions, 44 deletions

diff --git a/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp b/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp
index f857b2ef973..5bc18d3bfbe 100644
--- a/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp
+++ b/llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp
@@ -25,6 +25,7 @@
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Object/MachO.h"
+#include "llvm/Object/SymbolSize.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/DynamicLibrary.h"
 #include "llvm/Support/ManagedStatic.h"
@@ -252,38 +253,14 @@ static int printLineInfoForInput(bool LoadObjects, bool UseDebugObj) {
     std::unique_ptr<DIContext> Context(
       new DWARFContextInMemory(*SymbolObj,LoadedObjInfo.get()));
 
-    // FIXME: This is generally useful. Figure out a place in lib/Object to
-    // put utility functions.
-    std::map<object::SectionRef, std::vector<uint64_t>> FuncAddresses;
-    if (!isa<ELFObjectFileBase>(SymbolObj)) {
-      for (object::SymbolRef Sym : SymbolObj->symbols()) {
-        object::SymbolRef::Type SymType;
-        if (Sym.getType(SymType))
-          continue;
-        if (SymType != object::SymbolRef::ST_Function)
-          continue;
-        uint64_t Addr;
-        if (Sym.getAddress(Addr))
-          continue;
-        object::section_iterator Sec = SymbolObj->section_end();
-        if (Sym.getSection(Sec))
-          continue;
-        std::vector<uint64_t> &Addrs = FuncAddresses[*Sec];
-        if (Addrs.empty()) {
-          uint64_t SecAddr = Sec->getAddress();
-          uint64_t SecSize = Sec->getSize();
-          Addrs.push_back(SecAddr + SecSize);
-        }
-        Addrs.push_back(Addr);
-      }
-      for (auto &Pair : FuncAddresses) {
-        std::vector<uint64_t> &Addrs = Pair.second;
-        array_pod_sort(Addrs.begin(), Addrs.end());
-      }
-    }
+    ErrorOr<std::vector<std::pair<SymbolRef, uint64_t>>> SymAddrOrErr =
+        object::computeSymbolSizes(*SymbolObj);
+    if (std::error_code EC = SymAddrOrErr.getError())
+      return Error(EC.message());
 
     // Use symbol info to iterate functions in the object.
-    for (object::SymbolRef Sym : SymbolObj->symbols()) {
+    for (const auto &P : *SymAddrOrErr) {
+      object::SymbolRef Sym = P.first;
       object::SymbolRef::Type SymType;
       if (Sym.getType(SymType))
         continue;
@@ -295,20 +272,7 @@ static int printLineInfoForInput(bool LoadObjects, bool UseDebugObj) {
         if (Sym.getAddress(Addr))
           continue;
 
-        uint64_t Size;
-        if (isa<ELFObjectFileBase>(SymbolObj)) {
-          Size = Sym.getSize();
-        } else {
-          object::section_iterator Sec = SymbolObj->section_end();
-          if (Sym.getSection(Sec))
-            continue;
-          const std::vector<uint64_t> &Addrs = FuncAddresses[*Sec];
-          auto AddrI = std::find(Addrs.begin(), Addrs.end(), Addr);
-          assert(AddrI != Addrs.end() && (AddrI + 1) != Addrs.end());
-          assert(*AddrI == Addr);
-          Size = *(AddrI + 1) - Addr;
-        }
-
+        uint64_t Size = P.second;
         // If we're not using the debug object, compute the address of the
         // symbol in memory (rather than that in the unrelocated object file)
         // and use that to query the DWARFContext.