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Emit a symbol table entry for each function we output to the ELF file. This 

allows objdump to know which function we are emitting to:

00000000 <foo>:     <----
   0:   b8 01 00 00 00          mov    $0x1,%eax
   5:   03 44 24 04             add    0x4(%esp,1),%eax
   9:   c3                      ret

... and allows .o files to be useful for linking :)

llvm-svn: 22378
This commit is contained in:
Chris Lattner 2005-07-11 06:17:35 +00:00
parent c1b8551e3a
commit 5bacb00452
1 changed files with 31 additions and 1 deletions
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32
llvm/lib/CodeGen/ELFWriter.cpp
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@ -67,7 +67,37 @@ namespace llvm {
FnStart = OutputBuffer.size();
}
void finishFunction(MachineFunction &F) {}
void finishFunction(MachineFunction &F) {
// We now know the size of the function, add a symbol to represent it.
ELFWriter::ELFSym FnSym(F.getFunction());
// Figure out the binding (linkage) of the symbol.
switch (F.getFunction()->getLinkage()) {
default:
// appending linkage is illegal for functions.
assert(0 && "Unknown linkage type!");
case GlobalValue::ExternalLinkage:
FnSym.SetBind(ELFWriter::ELFSym::STB_GLOBAL);
break;
case GlobalValue::LinkOnceLinkage:
case GlobalValue::WeakLinkage:
FnSym.SetBind(ELFWriter::ELFSym::STB_WEAK);
break;
case GlobalValue::InternalLinkage:
FnSym.SetBind(ELFWriter::ELFSym::STB_LOCAL);
break;
}
FnSym.SetType(ELFWriter::ELFSym::STT_FUNC);
FnSym.SectionIdx = EW.SectionList.size()-1; // .text section.
// Value = Offset from start of .text
FnSym.Value = FnStart - EW.SectionList.back().Offset;
FnSym.Size = OutputBuffer.size()-FnStart;
// Finally, add it to the symtab.
EW.SymbolTable.push_back(FnSym);
}
void emitConstantPool(MachineConstantPool *MCP) {
if (MCP->isEmpty()) return;
assert(0 && "unimp");