[DebugInfo] Convert intrinsic llvm.dbg.label to MachineInstr.
In order to convert LLVM IR to MachineInstr, we need a new TargetOpcode,
DBG_LABEL, to ‘lower’ intrinsic llvm.dbg.label. The patch
creates this new TargetOpcode and convert intrinsic llvm.dbg.label to
MachineInstr through SelectionDAG.
In SelectionDAG, debug information is stored in SDDbgInfo. We create a
new data member of SDDbgInfo for labels and use the new data member,
SDDbgLabel, to create DBG_LABEL MachineInstr.
The new DBG_LABEL MachineInstr uses label metadata from LLVM IR as its
parameter. So, the backend could get metadata information of labels from
DBG_LABEL MachineInstr.
Differential Revision: https://reviews.llvm.org/D45341
Patch by Hsiangkai Wang.
llvm-svn: 331842
diff --git a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index 0027982..65ee381 100644
--- a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -753,6 +753,20 @@
return &*MIB;
}
+MachineInstr *
+InstrEmitter::EmitDbgLabel(SDDbgLabel *SD) {
+ MDNode *Label = SD->getLabel();
+ DebugLoc DL = SD->getDebugLoc();
+ assert(cast<DILabel>(Label)->isValidLocationForIntrinsic(DL) &&
+ "Expected inlined-at fields to agree");
+
+ const MCInstrDesc &II = TII->get(TargetOpcode::DBG_LABEL);
+ MachineInstrBuilder MIB = BuildMI(*MF, DL, II);
+ MIB.addMetadata(Label);
+
+ return &*MIB;
+}
+
/// EmitMachineNode - Generate machine code for a target-specific node and
/// needed dependencies.
///