From: Petr Hosek <phosek@chromium.org>
Date: Tue, 4 Apr 2017 23:32:45 +0000 (+0000)
Subject: [MC] Set defaults based on section names and support name suffixes
X-Git-Tag: llvmorg-5.0.0-rc1~8510
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=880cfd45fcc0b9417a7c8d22c45b38dd1fe23929;p=platform%2Fupstream%2Fllvm.git

[MC] Set defaults based on section names and support name suffixes

Set correct default flags and section type based on its name for .text,
.data, .bss, .init_array, .fini_array, .preinit_array, .tdata, and .tbss
and support section name suffixes for .data.*, .rodata.*, .text.*,
.bss.*, .tdata.* and .tbss.* which matches the behavior of GAS.

Fixes PR31888.

Differential Revision: https://reviews.llvm.org/D30229

llvm-svn: 299484
---

diff --git a/llvm/lib/MC/MCParser/ELFAsmParser.cpp b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
index ed911cb..401011a 100644
--- a/llvm/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
@@ -493,11 +493,20 @@ bool ELFAsmParser::ParseSectionArguments(bool IsPush, SMLoc loc) {
   int64_t UniqueID = ~0;
 
   // Set the defaults first.
-  if (SectionName == ".fini" || SectionName == ".init" ||
-      SectionName == ".rodata")
+  if (hasPrefix(SectionName, ".rodata.") || SectionName == ".rodata1")
     Flags |= ELF::SHF_ALLOC;
-  if (SectionName == ".fini" || SectionName == ".init")
-    Flags |= ELF::SHF_EXECINSTR;
+  if (SectionName == ".fini" || SectionName == ".init" ||
+      hasPrefix(SectionName, ".text."))
+    Flags |= 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."))
+    Flags |= ELF::SHF_ALLOC | ELF::SHF_WRITE;
+  if (hasPrefix(SectionName, ".tdata.") ||
+      hasPrefix(SectionName, ".tbss."))
+    Flags |= ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_TLS;
 
   if (getLexer().is(AsmToken::Comma)) {
     Lex();
@@ -575,9 +584,9 @@ EndStmt:
       Type = ELF::SHT_NOBITS;
     else if (hasPrefix(SectionName, ".tbss."))
       Type = ELF::SHT_NOBITS;
-    else if (SectionName == ".fini_array")
+    else if (hasPrefix(SectionName, ".fini_array."))
       Type = ELF::SHT_FINI_ARRAY;
-    else if (SectionName == ".preinit_array")
+    else if (hasPrefix(SectionName, ".preinit_array."))
       Type = ELF::SHT_PREINIT_ARRAY;
   } else {
     if (TypeName == "init_array")
diff --git a/llvm/test/MC/ELF/section.s b/llvm/test/MC/ELF/section.s
index a852b01e..03a0f22 100644
--- a/llvm/test/MC/ELF/section.s
+++ b/llvm/test/MC/ELF/section.s
@@ -220,3 +220,50 @@ bar:
 // CHECK-NEXT:   Size:
 // CHECK-NEXT:   Link:    22
 // CHECK-NEXT:   Info:    0
+
+.section	.text.foo
+// CHECK:        Section {
+// CHECK:          Name: .text.foo
+// CHECK-NEXT:     Type: SHT_PROGBITS
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_ALLOC
+// CHECK-NEXT:       SHF_EXECINSTR
+// CHECK-NEXT:     ]
+
+.section .bss
+// CHECK:        Section {
+// CHECK:          Name: .bss
+// CHECK-NEXT:     Type: SHT_NOBITS
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_ALLOC
+// CHECK-NEXT:       SHF_WRITE
+// CHECK-NEXT:     ]
+
+.section .bss.foo
+// CHECK:        Section {
+// CHECK:          Name: .bss.foo
+// CHECK-NEXT:     Type: SHT_NOBITS
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_ALLOC
+// CHECK-NEXT:       SHF_WRITE
+// CHECK-NEXT:     ]
+
+.section .tbss
+// CHECK:        Section {
+// CHECK:          Name: .tbss
+// CHECK-NEXT:     Type: SHT_NOBITS
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_ALLOC
+// CHECK-NEXT:       SHF_TLS
+// CHECK-NEXT:       SHF_WRITE
+// CHECK-NEXT:     ]
+
+.section .tbss.foo
+// CHECK:        Section {
+// CHECK:          Name: .tbss.foo
+// CHECK-NEXT:     Type: SHT_NOBITS
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_ALLOC
+// CHECK-NEXT:       SHF_TLS
+// CHECK-NEXT:       SHF_WRITE
+// CHECK-NEXT:     ]