SDIsel processes llvm.dbg.declare by recording the variable debug information descriptor and its corresponding stack frame index in MachineModuleInfo. This only works if the local variable is "homed" in the stack frame. It does not work for byval parameter, etc.
Added ISD::DECLARE node type to represent llvm.dbg.declare intrinsic. Now the intrinsic calls are lowered into a SDNode and lives on through out the codegen passes.
For now, since all the debugging information recording is done at isel time, when a ISD::DECLARE node is selected, it has the side effect of also recording the variable. This is a short term solution that should be fixed in time.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46659 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Target.td b/lib/Target/Target.td
index 4b1ab28..a2669dc 100644
--- a/lib/Target/Target.td
+++ b/lib/Target/Target.td
@@ -339,8 +339,15 @@
let Namespace = "TargetInstrInfo";
let hasCtrlDep = 1;
}
+def DECLARE : Instruction {
+ let OutOperandList = (ops);
+ let InOperandList = (ops variable_ops);
+ let AsmString = "";
+ let Namespace = "TargetInstrInfo";
+ let hasCtrlDep = 1;
+}
def EXTRACT_SUBREG : Instruction {
- let OutOperandList = (ops variable_ops);
+ let OutOperandList = (ops variable_ops);
let InOperandList = (ops variable_ops);
let AsmString = "";
let Namespace = "TargetInstrInfo";