From 9d9705f7c10c8c460207e84725e656f81263ddd2 Mon Sep 17 00:00:00 2001
From: Hans Wennborg <hans@hanshq.net>
Date: Tue, 7 Aug 2018 06:25:54 +0000
Subject: Merging r338968:
 ------------------------------------------------------------------------
 r338968 | echristo | 2018-08-05 16:23:37 +0200 (Sun, 05 Aug 2018) | 6 lines

Revert "Add a warning if someone attempts to add extra section flags to sections"

There are a bunch of edge cases and inconsistencies in how we're emitting sections
cause this warning to fire and it needs more work.

This reverts commit r335558.
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@339099 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCParser/ELFAsmParser.cpp  | 52 ++++++++++++---------------------------
 test/MC/ELF/extra-section-flags.s | 12 ---------
 2 files changed, 16 insertions(+), 48 deletions(-)
 delete mode 100644 test/MC/ELF/extra-section-flags.s

diff --git a/lib/MC/MCParser/ELFAsmParser.cpp b/lib/MC/MCParser/ELFAsmParser.cpp
index 7bf14968c97..3d9590e1f9f 100644
--- a/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/lib/MC/MCParser/ELFAsmParser.cpp
@@ -481,34 +481,6 @@ static bool hasPrefix(StringRef SectionName, StringRef Prefix) {
   return SectionName.startswith(Prefix) || SectionName == Prefix.drop_back();
 }
 
-// Return a set of section flags based on the section name that can then
-// be augmented later, otherwise return 0 if we don't have any reasonable
-// defaults.
-static unsigned defaultSectionFlags(StringRef SectionName) {
-
-  if (hasPrefix(SectionName, ".rodata.cst"))
-    return ELF::SHF_ALLOC | ELF::SHF_MERGE;
-
-  if (hasPrefix(SectionName, ".rodata.") || SectionName == ".rodata1")
-    return ELF::SHF_ALLOC;
-
-  if (SectionName == ".fini" || SectionName == ".init" ||
-      hasPrefix(SectionName, ".text."))
-    return ELF::SHF_ALLOC | ELF::SHF_EXECINSTR;
-
-  if (hasPrefix(SectionName, ".data.") || SectionName == ".data1" ||
-      hasPrefix(SectionName, ".bss.") ||
-      hasPrefix(SectionName, ".init_array.") ||
-      hasPrefix(SectionName, ".fini_array.") ||
-      hasPrefix(SectionName, ".preinit_array."))
-    return ELF::SHF_ALLOC | ELF::SHF_WRITE;
-
-  if (hasPrefix(SectionName, ".tdata.") || hasPrefix(SectionName, ".tbss."))
-    return ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_TLS;
-
-  return 0;
-}
-
 bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
   StringRef SectionName;
 
@@ -518,13 +490,27 @@ bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
   StringRef TypeName;
   int64_t Size = 0;
   StringRef GroupName;
+  unsigned Flags = 0;
   const MCExpr *Subsection = nullptr;
   bool UseLastGroup = false;
   MCSymbolELF *Associated = nullptr;
   int64_t UniqueID = ~0;
 
-  // Set the default section flags first in case no others are given.
-  unsigned Flags = defaultSectionFlags(SectionName);
+  // Set the defaults first.
+  if (hasPrefix(SectionName, ".rodata.") || SectionName == ".rodata1")
+    Flags |= ELF::SHF_ALLOC;
+  else if (SectionName == ".fini" || SectionName == ".init" ||
+           hasPrefix(SectionName, ".text."))
+    Flags |= ELF::SHF_ALLOC | ELF::SHF_EXECINSTR;
+  else if (hasPrefix(SectionName, ".data.") || SectionName == ".data1" ||
+           hasPrefix(SectionName, ".bss.") ||
+           hasPrefix(SectionName, ".init_array.") ||
+           hasPrefix(SectionName, ".fini_array.") ||
+           hasPrefix(SectionName, ".preinit_array."))
+    Flags |= ELF::SHF_ALLOC | ELF::SHF_WRITE;
+  else if (hasPrefix(SectionName, ".tdata.") ||
+           hasPrefix(SectionName, ".tbss."))
+    Flags |= ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_TLS;
 
   if (getLexer().is(AsmToken::Comma)) {
     Lex();
@@ -552,12 +538,6 @@ bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
 
     if (extraFlags == -1U)
       return TokError("unknown flag");
-
-    // If we found additional section flags on a known section then give a
-    // warning.
-    if (Flags && Flags != extraFlags)
-      Warning(loc, "setting incorrect section attributes for " + SectionName);
-
     Flags |= extraFlags;
 
     bool Mergeable = Flags & ELF::SHF_MERGE;
diff --git a/test/MC/ELF/extra-section-flags.s b/test/MC/ELF/extra-section-flags.s
deleted file mode 100644
index bde7e1abf8e..00000000000
--- a/test/MC/ELF/extra-section-flags.s
+++ /dev/null
@@ -1,12 +0,0 @@
-# RUN: llvm-mc -triple x86_64-unknown-unknown -filetype=obj %s -o /dev/null 2>&1 | FileCheck %s
-
-.section .rodata, "ax"
-# CHECK: warning: setting incorrect section attributes for .rodata
-nop
-
-.section .rodata, "a"
-nop
-.section .rodata.cst4, "aM",@progbits,8
-nop
-# CHECK-NOT: warning:
-
-- 
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