MIR: Allow parsing of empty machine functions
If you run llc -stop-after=codegenprepare and feed the resulting MIR
to llc -start-after=codegenprepare, you'll have an empty machine
function since we haven't run any isel yet. Of course, this only works
if the MIRParser believes you that this is okay.
This is essentially a revert of r241862 with a fix for the problem it
was papering over.
llvm-svn: 299975
diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index fc40261..f49232b 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -528,7 +528,8 @@
lastIndex = SlotIndex();
regsReserved = MRI->getReservedRegs();
- markReachable(&MF->front());
+ if (!MF->empty())
+ markReachable(&MF->front());
// Build a set of the basic blocks in the function.
FunctionBlocks.clear();
@@ -548,7 +549,8 @@
// Check that the register use lists are sane.
MRI->verifyUseLists();
- verifyStackFrame();
+ if (!MF->empty())
+ verifyStackFrame();
}
// Does iterator point to a and b as the first two elements?