Handle inlined variables in SelectionDAGBuilder::EmitFuncArgumentDbgValue().
In 2010 a commit with no testcase and no further explanation
explicitly disabled the handling of inlined variables in
EmitFuncArgumentDbgValue(). I don't think there is a good reason for
this any more and re-enabling this adds debug locations for variables
associated with an LLVM function argument in functions that are
inlined into the first basic block. The only downside of doing this is
that we may insert a DBG_VALUE before the inlined scope, but (1) this
could be filtered out later, and (2) LiveDebugValues will not
propagate it into subsequent basic blocks if they don't dominate the
variable's lexical scope, so this seems like a small price to pay.
rdar://problem/26228128
llvm-svn: 317702
diff --git a/llvm/test/DebugInfo/X86/live-debug-variables.ll b/llvm/test/DebugInfo/X86/live-debug-variables.ll
index fbfd1d9..90669f5 100644
--- a/llvm/test/DebugInfo/X86/live-debug-variables.ll
+++ b/llvm/test/DebugInfo/X86/live-debug-variables.ll
@@ -24,8 +24,9 @@
; CHECK: .debug_loc contents:
; CHECK-NEXT: 0x00000000:
-; CHECK-NEXT: 0x000000000000001f - 0x000000000000003c: DW_OP_reg3 RBX
-; We should only have one entry
+; We currently emit an entry for the function prologue, too, which could be optimized away.
+; CHECK: 0x000000000000001f - 0x000000000000003c: DW_OP_reg3 RBX
+; We should only have one entry inside the function.
; CHECK-NOT: :
declare i32 @foobar(i32, i32, i32, i32, i32)