Cleanup else-after-return and add an early-return to llvm-nm

The loop and error handling in checkMachOAndArchFlags didn't make sense
to me (a loop that only ever executes once? An error path that uses the
element the loop stopped at (which must always be a buffer overrun if
I'm reading that right?)... I'm confused) but I've made a guess at what
was intended.

Based on a patch by Richard Thomson to simplify boolean expressions.

llvm-svn: 233025

1 files changed, 59 insertions, 71 deletions

diff --git a/llvm/tools/llvm-nm/llvm-nm.cpp b/llvm/tools/llvm-nm/llvm-nm.cpp
index f911c724646..b62b5473ae0 100644
--- a/llvm/tools/llvm-nm/llvm-nm.cpp
+++ b/llvm/tools/llvm-nm/llvm-nm.cpp
@@ -188,85 +188,77 @@ static bool compareSymbolAddress(const NMSymbol &A, const NMSymbol &B) {
   if (!ReverseSort) {
     if (A.Address < B.Address)
       return true;
-    else if (A.Address == B.Address && A.Name < B.Name)
+    if (A.Address == B.Address && A.Name < B.Name)
       return true;
-    else if (A.Address == B.Address && A.Name == B.Name && A.Size < B.Size)
+    if (A.Address == B.Address && A.Name == B.Name && A.Size < B.Size)
       return true;
-    else
-      return false;
-  } else {
-    if (A.Address > B.Address)
-      return true;
-    else if (A.Address == B.Address && A.Name > B.Name)
-      return true;
-    else if (A.Address == B.Address && A.Name == B.Name && A.Size > B.Size)
-      return true;
-    else
-      return false;
+    return false;
   }
+
+  if (A.Address > B.Address)
+    return true;
+  if (A.Address == B.Address && A.Name > B.Name)
+    return true;
+  if (A.Address == B.Address && A.Name == B.Name && A.Size > B.Size)
+    return true;
+  return false;
 }
 
 static bool compareSymbolSize(const NMSymbol &A, const NMSymbol &B) {
   if (!ReverseSort) {
     if (A.Size < B.Size)
       return true;
-    else if (A.Size == B.Size && A.Name < B.Name)
-      return true;
-    else if (A.Size == B.Size && A.Name == B.Name && A.Address < B.Address)
-      return true;
-    else
-      return false;
-  } else {
-    if (A.Size > B.Size)
+    if (A.Size == B.Size && A.Name < B.Name)
       return true;
-    else if (A.Size == B.Size && A.Name > B.Name)
+    if (A.Size == B.Size && A.Name == B.Name && A.Address < B.Address)
       return true;
-    else if (A.Size == B.Size && A.Name == B.Name && A.Address > B.Address)
-      return true;
-    else
-      return false;
+    return false;
   }
+
+  if (A.Size > B.Size)
+    return true;
+  if (A.Size == B.Size && A.Name > B.Name)
+    return true;
+  if (A.Size == B.Size && A.Name == B.Name && A.Address > B.Address)
+    return true;
+  return false;
 }
 
 static bool compareSymbolName(const NMSymbol &A, const NMSymbol &B) {
   if (!ReverseSort) {
     if (A.Name < B.Name)
       return true;
-    else if (A.Name == B.Name && A.Size < B.Size)
-      return true;
-    else if (A.Name == B.Name && A.Size == B.Size && A.Address < B.Address)
-      return true;
-    else
-      return false;
-  } else {
-    if (A.Name > B.Name)
+    if (A.Name == B.Name && A.Size < B.Size)
       return true;
-    else if (A.Name == B.Name && A.Size > B.Size)
+    if (A.Name == B.Name && A.Size == B.Size && A.Address < B.Address)
       return true;
-    else if (A.Name == B.Name && A.Size == B.Size && A.Address > B.Address)
-      return true;
-    else
-      return false;
+    return false;
   }
+  if (A.Name > B.Name)
+    return true;
+  if (A.Name == B.Name && A.Size > B.Size)
+    return true;
+  if (A.Name == B.Name && A.Size == B.Size && A.Address > B.Address)
+    return true;
+  return false;
 }
 
 static char isSymbolList64Bit(SymbolicFile &Obj) {
   if (isa<IRObjectFile>(Obj))
     return false;
-  else if (isa<COFFObjectFile>(Obj))
+  if (isa<COFFObjectFile>(Obj))
     return false;
-  else if (MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(&Obj))
+  if (MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(&Obj))
     return MachO->is64Bit();
-  else if (isa<ELF32LEObjectFile>(Obj))
+  if (isa<ELF32LEObjectFile>(Obj))
     return false;
-  else if (isa<ELF64LEObjectFile>(Obj))
+  if (isa<ELF64LEObjectFile>(Obj))
     return true;
-  else if (isa<ELF32BEObjectFile>(Obj))
+  if (isa<ELF32BEObjectFile>(Obj))
     return false;
-  else if (isa<ELF64BEObjectFile>(Obj))
+  if (isa<ELF64BEObjectFile>(Obj))
     return true;
-  else
-    return false;
+  return false;
 }
 
 static StringRef CurrentFilename;
@@ -973,30 +965,26 @@ static void dumpSymbolNamesFromObject(SymbolicFile &Obj, bool printName,
 // architectures was specificed.  If not then an error is generated and this
 // routine returns false.  Else it returns true.
 static bool checkMachOAndArchFlags(SymbolicFile *O, std::string &Filename) {
-  if (isa<MachOObjectFile>(O) && !ArchAll && ArchFlags.size() != 0) {
-    MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(O);
-    bool ArchFound = false;
-    MachO::mach_header H;
-    MachO::mach_header_64 H_64;
-    Triple T;
-    if (MachO->is64Bit()) {
-      H_64 = MachO->MachOObjectFile::getHeader64();
-      T = MachOObjectFile::getArch(H_64.cputype, H_64.cpusubtype);
-    } else {
-      H = MachO->MachOObjectFile::getHeader();
-      T = MachOObjectFile::getArch(H.cputype, H.cpusubtype);
-    }
-    unsigned i;
-    for (i = 0; i < ArchFlags.size(); ++i) {
-      if (ArchFlags[i] == T.getArchName())
-        ArchFound = true;
-      break;
-    }
-    if (!ArchFound) {
-      error(ArchFlags[i],
-            "file: " + Filename + " does not contain architecture");
-      return false;
-    }
+  MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(O);
+
+  if (!MachO || ArchAll || ArchFlags.size() == 0)
+    return true;
+
+  MachO::mach_header H;
+  MachO::mach_header_64 H_64;
+  Triple T;
+  if (MachO->is64Bit()) {
+    H_64 = MachO->MachOObjectFile::getHeader64();
+    T = MachOObjectFile::getArch(H_64.cputype, H_64.cpusubtype);
+  } else {
+    H = MachO->MachOObjectFile::getHeader();
+    T = MachOObjectFile::getArch(H.cputype, H.cpusubtype);
+  }
+  if (std::none_of(
+          ArchFlags.begin(), ArchFlags.end(),
+          [&](const std::string &Name) { return Name == T.getArchName(); })) {
+    error("No architecture specified", Filename);
+    return false;
   }
   return true;
 }