[PATCH] D48112: Simplify PPC64::calcEFlags().

[Rui Ueyama via Phabricator via llvm-commits]

ruiu updated this revision to Diff 151274.
ruiu added a comment.

- separated error message for v1 and unknown eflags
- added a test


https://reviews.llvm.org/D48112

Files:
  lld/ELF/Arch/PPC64.cpp
  lld/test/ELF/ppc64-abi-version.s


Index: lld/test/ELF/ppc64-abi-version.s
===================================================================
--- /dev/null
+++ lld/test/ELF/ppc64-abi-version.s
@@ -0,0 +1,11 @@
+# REQUIRES: ppc
+
+# RUN: echo '.abiversion 1' | llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux - -o %t1.o
+# RUN: not ld.lld -o %t.exe %t1.o 2>&1 | FileCheck -check-prefix=ERR1 %s
+
+# ERR1: ABI version 1 is not supported
+
+# RUN: echo '.abiversion 3' | llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux - -o %t1.o
+# RUN: not ld.lld -o %t.exe %t1.o 2>&1 | FileCheck -check-prefix=ERR2 %s
+
+# ERR2: unrecognized feature flags: 3
Index: lld/ELF/Arch/PPC64.cpp
===================================================================
--- lld/ELF/Arch/PPC64.cpp
+++ lld/ELF/Arch/PPC64.cpp
@@ -107,52 +107,21 @@
 }
 
 static uint32_t getEFlags(InputFile *File) {
-  // Get the e_flag from the input file and issue an error if incompatible
-  // e_flag encountered.
-  uint32_t EFlags;
-  switch (Config->EKind) {
-  case ELF64BEKind:
-    EFlags = cast<ObjFile<ELF64BE>>(File)->getObj().getHeader()->e_flags;
-    break;
-  case ELF64LEKind:
-    EFlags = cast<ObjFile<ELF64LE>>(File)->getObj().getHeader()->e_flags;
-    break;
-  default:
-    llvm_unreachable("unknown Config->EKind");
-  }
-  if (EFlags > 2) {
-    error("incompatible e_flags: " +  toString(File));
-    return 0;
-  }
-  return EFlags;
+  if (Config->EKind == ELF64BEKind)
+    return cast<ObjFile<ELF64BE>>(File)->getObj().getHeader()->e_flags;
+  return cast<ObjFile<ELF64LE>>(File)->getObj().getHeader()->e_flags;
 }
 
+// This file implements v2 ABI. This function makes sure that all
+// object files have v2 or unspecified as an ABI version.
 uint32_t PPC64::calcEFlags() const {
-  assert(!ObjectFiles.empty());
-
-  uint32_t NonZeroFlag;
-  for (InputFile *F : makeArrayRef(ObjectFiles)) {
-    NonZeroFlag = getEFlags(F);
-    if (NonZeroFlag)
-      break;
-  }
-
-  // Verify that all input files have either the same e_flags, or zero.
   for (InputFile *F : makeArrayRef(ObjectFiles)) {
     uint32_t Flag = getEFlags(F);
-    if (Flag == 0 || Flag == NonZeroFlag)
-      continue;
-    error(toString(F) + ": ABI version " + Twine(Flag) +
-          " is not compatible with ABI version " + Twine(NonZeroFlag) +
-          " output");
-    return 0;
+    if (Flag == 1)
+      error(toString(F) + ": ABI version 1 is not supported");
+    else if (Flag > 2)
+      error(toString(F) + ": unrecognized feature flags: " + Twine(Flag));
   }
-
-  if (NonZeroFlag == 1) {
-    error("PPC64 V1 ABI not supported");
-    return 0;
-  }
-
   return 2;
 }
 


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