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Add support for having multiple sections with the same name and comdat.

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Using this in combination with -ffunction-sections allows LLVM to output a .o
file with mulitple sections named .text. This saves space by avoiding long
unique names of the form .text.<C++ mangled name>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228980 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-02-12 23:29:51 +00:00
parent 73a92d5136
commit 2fa06b171b
12 changed files with 126 additions and 29 deletions
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7
lib/MC/MCSectionELF.cpp
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@ -24,6 +24,9 @@ MCSectionELF::~MCSectionELF() {} // anchor.
bool MCSectionELF::ShouldOmitSectionDirective(StringRef Name,
const MCAsmInfo &MAI) const {
if (Unique)
return false;
// FIXME: Does .section .bss/.data/.text work everywhere??
if (Name == ".text" || Name == ".data" ||
(Name == ".bss" && !MAI.usesELFSectionDirectiveForBSS()))
@ -144,6 +147,10 @@ void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
printName(OS, Group->getName());
OS << ",comdat";
}
if (Unique)
OS << ",unique";
OS << '\n';
if (Subsection)