Object/COFF: Fix possible truncation bug.

VA can be 64 bit, as the image base can be larger than 4GB, so we need to
handle 64 bit VAs properly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201803 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Object/COFF.h

@@ -397,7 +397,7 @@ class COFFObjectFile : public ObjectFile {
   error_code getSectionContents(const coff_section *Sec,
                                 ArrayRef<uint8_t> &Res) const;
 
-  error_code getVaPtr(uint32_t Rva, uintptr_t &Res) const;
+  error_code getVaPtr(uint64_t VA, uintptr_t &Res) const;
   error_code getRvaPtr(uint32_t Rva, uintptr_t &Res) const;
   error_code getHintName(uint32_t Rva, uint16_t &Hint, StringRef &Name) const;
 

lib/Object/COFFObjectFile.cpp

@@ -19,6 +19,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cctype>
+#include <cstdint>
 
 using namespace llvm;
 using namespace object;
@@ -382,9 +383,11 @@ error_code COFFObjectFile::initSymbolTablePtr() {
 }
 
 // Returns the file offset for the given VA.
-error_code COFFObjectFile::getVaPtr(uint32_t Addr, uintptr_t &Res) const {
-  uint32_t ImageBase = PE32Header ? PE32Header->ImageBase : (uint32_t)PE32PlusHeader->ImageBase;
-  return getRvaPtr(Addr - ImageBase, Res);
+error_code COFFObjectFile::getVaPtr(uint64_t Addr, uintptr_t &Res) const {
+  uint64_t ImageBase = PE32Header ? PE32Header->ImageBase : PE32PlusHeader->ImageBase;
+  uint64_t Rva = Addr - ImageBase;
+  assert(Rva <= UINT32_MAX);
+  return getRvaPtr((uint32_t)Rva, Res);
 }
 
 // Returns the file offset for the given RVA.