Reland "[DwarfDebug] Dump call site debug info"

The build failure found after the rL365467 has been
resolved.

Differential Revision: https://reviews.llvm.org/D60716

llvm-svn: 367446

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 3ac474e2bdd..4f3630f84c9 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -254,6 +254,25 @@ public:
   }
 };
 
+/// Used for tracking debug info about call site parameters.
+class DbgCallSiteParam {
+private:
+  unsigned Register; ///< Parameter register at the callee entry point.
+  DbgValueLoc Value; ///< Corresponding location for the parameter value at
+                     ///< the call site.
+public:
+  DbgCallSiteParam(unsigned Reg, DbgValueLoc Val)
+      : Register(Reg), Value(Val) {
+    assert(Reg && "Parameter register cannot be undef");
+  }
+
+  unsigned getRegister() const { return Register; }
+  DbgValueLoc getValue() const { return Value; }
+};
+
+/// Collection used for storing debug call site parameters.
+using ParamSet = SmallVector<DbgCallSiteParam, 4>;
+
 /// Helper used to pair up a symbol and its DWARF compile unit.
 struct SymbolCU {
   SymbolCU(DwarfCompileUnit *CU, const MCSymbol *Sym) : Sym(Sym), CU(CU) {}