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[BOLT] Emit symbol size for functions 

Summary:
On targets that support it, emit size of the emitted function symbol.

At the moment there's no use for the size except that it is visible in a
temporary .o file symbol table.

(cherry picked from FBD24246177)
This commit is contained in:
Maksim Panchenko 2020-10-12 13:02:50 -07:00
parent 528da5d795
commit 247b4181a3
1 changed files with 17 additions and 6 deletions
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23
bolt/src/BinaryEmitter.cpp
View File

@ -290,16 +290,19 @@ bool BinaryEmitter::emitFunction(BinaryFunction &Function, bool EmitColdPart) {
MCContext &Context = Streamer.getContext();
const MCAsmInfo *MAI = Context.getAsmInfo();
MCSymbol *StartSymbol = nullptr;
// Emit all symbols associated with the main function entry.
if (!EmitColdPart) {
for (auto *Symbol : Function.getSymbols()) {
StartSymbol = Function.getSymbol();
for (MCSymbol *Symbol : Function.getSymbols()) {
Streamer.EmitSymbolAttribute(Symbol, MCSA_ELF_TypeFunction);
Streamer.EmitLabel(Symbol);
}
} else {
auto *Symbol = Function.getColdSymbol();
Streamer.EmitSymbolAttribute(Symbol, MCSA_ELF_TypeFunction);
Streamer.EmitLabel(Symbol);
StartSymbol = Function.getColdSymbol();
Streamer.EmitSymbolAttribute(StartSymbol, MCSA_ELF_TypeFunction);
Streamer.EmitLabel(StartSymbol);
}
// Emit CFI start
@ -358,8 +361,16 @@ bool BinaryEmitter::emitFunction(BinaryFunction &Function, bool EmitColdPart) {
if (Function.hasCFI())
Streamer.EmitCFIEndProc();
Streamer.EmitLabel(EmitColdPart ? Function.getFunctionColdEndLabel()
: Function.getFunctionEndLabel());
MCSymbol *EndSymbol = EmitColdPart ? Function.getFunctionColdEndLabel()
: Function.getFunctionEndLabel();
Streamer.EmitLabel(EndSymbol);
if (MAI->hasDotTypeDotSizeDirective()) {
const MCExpr *SizeExpr = MCBinaryExpr::createSub(
MCSymbolRefExpr::create(EndSymbol, Context),
MCSymbolRefExpr::create(StartSymbol, Context), Context);
Streamer.emitELFSize(StartSymbol, SizeExpr);
}
// Exception handling info for the function.
emitLSDA(Function, EmitColdPart);