Select DW_AT_const_value size based on variable size.

llvm-svn: 132193

3 files changed, 15 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index df3a4aa7b0f..ec6954e302a 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -440,11 +440,20 @@ void CompileUnit::addBlockByrefAddress(DbgVariable *&DV, DIE *Die,
 }
 
 /// addConstantValue - Add constant value entry in variable DIE.
-bool CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO) {
+bool CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
+                                   DIType Ty) {
   assert (MO.isImm() && "Invalid machine operand!");
   DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
   unsigned Imm = MO.getImm();
-  addUInt(Block, 0, dwarf::DW_FORM_udata, Imm);
+  unsigned form = dwarf::DW_FORM_udata;
+  switch (Ty.getSizeInBits()) {
+    case 8: form = dwarf::DW_FORM_data1; break;
+    case 16: form = dwarf::DW_FORM_data2; break;
+    case 32: form = dwarf::DW_FORM_data4; break;
+    case 64: form = dwarf::DW_FORM_data8; break;
+    default: break;
+  }
+  addUInt(Block, 0, form, Imm);
   addBlock(Die, dwarf::DW_AT_const_value, 0, Block);
   return true;
 }
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
index 49ea05c3a8c..2edca8954b3 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -182,7 +182,7 @@ public:
                   const MachineLocation &Location);
 
   /// addConstantValue - Add constant value entry in variable DIE.
-  bool addConstantValue(DIE *Die, const MachineOperand &MO);
+  bool addConstantValue(DIE *Die, const MachineOperand &MO, DIType Ty);
   bool addConstantValue(DIE *Die, ConstantInt *CI, bool Unsigned);
 
   /// addConstantFPValue - Add constant value entry in variable DIE.
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index f0ba6757238..53580d76aa0 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -712,8 +712,9 @@ DIE *DwarfDebug::constructVariableDIE(DbgVariable *DV, DbgScope *Scope) {
         updated = true;
       }
       else if (DVInsn->getOperand(0).isImm())
-        updated = VariableCU->addConstantValue(VariableDie, 
-                                               DVInsn->getOperand(0));
+        updated = 
+          VariableCU->addConstantValue(VariableDie, DVInsn->getOperand(0),
+                                       DV->getType());
       else if (DVInsn->getOperand(0).isFPImm())
         updated =
           VariableCU->addConstantFPValue(VariableDie, DVInsn->getOperand(0));