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Only get the .bss and .data sections when needed instead of unconditionally.

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This allows is to not emit empty sections when .data or .bss is not used.

llvm-svn: 22457
This commit is contained in:
Chris Lattner 2005-07-16 17:41:06 +00:00
parent 5aed419b6d
commit 07d79f8aa7
1 changed files with 3 additions and 11 deletions
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14
lib/CodeGen/ELFWriter.cpp
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@ -223,8 +223,7 @@ bool ELFWriter::doInitialization(Module &M) {
return false;
}
void ELFWriter::EmitGlobal(GlobalVariable *GV, ELFSection &DataSection,
ELFSection &BSSSection) {
void ELFWriter::EmitGlobal(GlobalVariable *GV) {
// If this is an external global, emit it now. TODO: Note that it would be
// better to ignore the symbol here and only add it to the symbol table if
// referenced.
@ -264,6 +263,7 @@ void ELFWriter::EmitGlobal(GlobalVariable *GV, ELFSection &DataSection,
// Handle alignment. Ensure section is aligned at least as much as required
// by this symbol.
ELFSection &BSSSection = getBSSSection();
BSSSection.Align = std::max(BSSSection.Align, Align);
// Within the section, emit enough virtual padding to get us to an alignment
@ -315,17 +315,9 @@ bool ELFWriter::runOnMachineFunction(MachineFunction &MF) {
bool ELFWriter::doFinalization(Module &M) {
// Okay, the ELF header and .text sections have been completed, build the
// .data, .bss, and "common" sections next.
ELFSection &DataSection =
getSection(".data", ELFSection::SHT_PROGBITS,
ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
ELFSection &BSSSection =
getSection(".bss", ELFSection::SHT_NOBITS,
ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
EmitGlobal(I, DataSection, BSSSection);
EmitGlobal(I);
// Emit the symbol table now, if non-empty.
EmitSymbolTable();