[llvm/Object] - Convert SectionRef::getName() to return Expected<>

SectionRef::getName() returns std::error_code now.
Returning Expected<> instead has multiple benefits.

For example, it forces user to check the error returned.
Also Expected<> may keep a valuable string error message,
what is more useful than having a error code.
(Object\invalid.test was updated to show the new messages printed.)

This patch makes a change for all users to switch to Expected<> version.

Note: in a few places the error returned was ignored before my changes.
In such places I left them ignored. My intention was to convert the interface
used, and not to improve and/or the existent users in this patch.
(Though I think this is good idea for a follow-ups to revisit such places
and either remove consumeError calls or comment each of them to clarify why
it is OK to have them).

Differential revision: https://reviews.llvm.org/D66089

llvm-svn: 368812

1 files changed, 5 insertions, 4 deletions

diff --git a/llvm/lib/Object/COFFObjectFile.cpp b/llvm/lib/Object/COFFObjectFile.cpp
index 854664e679d..afd68694deb 100644
--- a/llvm/lib/Object/COFFObjectFile.cpp
+++ b/llvm/lib/Object/COFFObjectFile.cpp
@@ -994,11 +994,12 @@ std::error_code COFFObjectFile::getSection(int32_t Index,
 std::error_code COFFObjectFile::getSection(StringRef SectionName,
                                            const coff_section *&Result) const {
   Result = nullptr;
-  StringRef SecName;
   for (const SectionRef &Section : sections()) {
-    if (std::error_code E = Section.getName(SecName))
-      return E;
-    if (SecName == SectionName) {
+    auto NameOrErr = Section.getName();
+    if (!NameOrErr)
+      return errorToErrorCode(NameOrErr.takeError());
+
+    if (*NameOrErr == SectionName) {
       Result = getCOFFSection(Section);
       return std::error_code();
     }