If there are no machine instructions emitted for a function, then insert
a "nop" instruction so that we don't have the function's label associated
with something that it's not supposed to be associated with.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46394 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index bab1af3..6a1451d 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -30,6 +30,7 @@
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/CommandLine.h"
@@ -813,6 +814,18 @@
// Emit pre-function debug information.
DW.BeginFunction(&MF);
+ // If the function is empty, then we need to emit *something*. Otherwise, the
+ // function's label might be associated with something that it wasn't meant to
+ // be associated with. We emit a noop in this situation.
+ MachineFunction::iterator I = MF.begin();
+
+ if (++I == MF.end()) {
+ MachineBasicBlock &MBB = MF.front();
+
+ if (MBB.begin() == MBB.end())
+ BuildMI(MBB, MBB.end(), TM.getInstrInfo()->get(PPC::NOP));
+ }
+
// Print out code for the function.
for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
I != E; ++I) {
@@ -821,8 +834,8 @@
printBasicBlockLabel(I, true);
O << '\n';
}
- for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
- II != E; ++II) {
+ for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
+ II != IE; ++II) {
// Print the assembly for the instruction.
O << "\t";
printMachineInstruction(II);