[DWARF] Handle the DW_OP_entry_value operand

Add the IR and the AsmPrinter parts for handling of the DW_OP_entry_values
DWARF operation.

([11/13] Introduce the debug entry values.)

Co-authored-by: Ananth Sowda <asowda@cisco.com>
Co-authored-by: Nikola Prica <nikola.prica@rt-rk.com>
Co-authored-by: Ivan Baev <ibaev@cisco.com>

Differential Revision: https://reviews.llvm.org/D60866

llvm-svn: 364542

1 files changed, 19 insertions, 1 deletions

diff --git a/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp b/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
index 644075011a3..470d4b5364b 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp
@@ -97,8 +97,10 @@ static DescVector getDescriptions() {
   Descriptions[DW_OP_addrx] = Desc(Op::Dwarf4, Op::SizeLEB);
   Descriptions[DW_OP_GNU_addr_index] = Desc(Op::Dwarf4, Op::SizeLEB);
   Descriptions[DW_OP_GNU_const_index] = Desc(Op::Dwarf4, Op::SizeLEB);
+  Descriptions[DW_OP_GNU_entry_value] = Desc(Op::Dwarf4, Op::SizeLEB);
 
   Descriptions[DW_OP_convert] = Desc(Op::Dwarf5, Op::BaseTypeRef);
+  Descriptions[DW_OP_entry_value] = Desc(Op::Dwarf5, Op::SizeLEB);
 
   return Descriptions;
 }
@@ -275,7 +277,8 @@ bool DWARFExpression::Operation::print(raw_ostream &OS,
     } else {
       if (Signed)
         OS << format(" %+" PRId64, (int64_t)Operands[Operand]);
-      else
+      else if (Opcode != DW_OP_entry_value &&
+               Opcode != DW_OP_GNU_entry_value)
         OS << format(" 0x%" PRIx64, Operands[Operand]);
     }
   }
@@ -284,6 +287,7 @@ bool DWARFExpression::Operation::print(raw_ostream &OS,
 
 void DWARFExpression::print(raw_ostream &OS, const MCRegisterInfo *RegInfo,
                             DWARFUnit *U, bool IsEH) const {
+  uint32_t EntryValExprSize = 0;
   for (auto &Op : *this) {
     if (!Op.print(OS, this, RegInfo, U, IsEH)) {
       uint32_t FailOffset = Op.getEndOffset();
@@ -291,6 +295,20 @@ void DWARFExpression::print(raw_ostream &OS, const MCRegisterInfo *RegInfo,
         OS << format(" %02x", Data.getU8(&FailOffset));
       return;
     }
+
+    if (Op.getCode() == DW_OP_entry_value ||
+        Op.getCode() == DW_OP_GNU_entry_value) {
+      OS << "(";
+      EntryValExprSize = Op.getRawOperand(0);
+      continue;
+    }
+
+    if (EntryValExprSize) {
+      EntryValExprSize--;
+      if (EntryValExprSize == 0)
+        OS << ")";
+    }
+
     if (Op.getEndOffset() < Data.getData().size())
       OS << ", ";
   }