PR14492: Debug Info: Support for values of non-integer non-type template parameters.

This is only tested for global variables at the moment (& includes tests
for the unnamed parameter case, since apparently this entire function
was completely untested previously)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181632 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 24 insertions, 4 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index c38ada6..7f0c33b 100644
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -588,6 +588,9 @@ static bool isTypeSigned(DIType Ty, int *SizeInBits) {
 /// addConstantValue - Add constant value entry in variable DIE.
 bool CompileUnit::addConstantValue(DIE *Die, const MachineOperand &MO,
                                    DIType Ty) {
+  // FIXME: This is a bit conservative/simple - it emits negative values at
+  // their maximum bit width which is a bit unfortunate (& doesn't prefer
+  // udata/sdata over dataN as suggested by the DWARF spec)
   assert(MO.isImm() && "Invalid machine operand!");
   DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
   int SizeInBits = -1;
@@ -1095,8 +1098,21 @@ CompileUnit::getOrCreateTemplateValueParameterDIE(DITemplateValueParameter TPV){
   addType(ParamDIE, TPV.getType());
   if (!TPV.getName().empty())
     addString(ParamDIE, dwarf::DW_AT_name, TPV.getName());
-  addUInt(ParamDIE, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
-          TPV.getValue());
+  if (Value *Val = TPV.getValue()) {
+    if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
+      addConstantValue(ParamDIE, CI, TPV.getType().isUnsignedDIType());
+    else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
+      // For declaration non-type template parameters (such as global values and
+      // functions)
+      DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
+      addOpAddress(Block, Asm->Mang->getSymbol(GV));
+      // Emit DW_OP_stack_value to use the address as the immediate value of the
+      // parameter, rather than a pointer to it.
+      addUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
+      addBlock(ParamDIE, dwarf::DW_AT_location, 0, Block);
+    }
+  }
+
   return ParamDIE;
 }
 
diff --git a/lib/IR/DIBuilder.cpp b/lib/IR/DIBuilder.cpp
index eb220b2..4bb87c9 100644
--- a/lib/IR/DIBuilder.cpp
+++ b/lib/IR/DIBuilder.cpp
@@ -502,7 +502,7 @@ DIBuilder::createTemplateTypeParameter(DIDescriptor Context, StringRef Name,
 /// value parameter.
 DITemplateValueParameter
 DIBuilder::createTemplateValueParameter(DIDescriptor Context, StringRef Name,
-                                        DIType Ty, uint64_t Val,
+                                        DIType Ty, Value *Val,
                                         MDNode *File, unsigned LineNo,
                                         unsigned ColumnNo) {
   Value *Elts[] = {
@@ -510,7 +510,7 @@ DIBuilder::createTemplateValueParameter(DIDescriptor Context, StringRef Name,
     getNonCompileUnitScope(Context),
     MDString::get(VMContext, Name),
     Ty,
-    ConstantInt::get(Type::getInt64Ty(VMContext), Val),
+    Val,
     File,
     ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
     ConstantInt::get(Type::getInt32Ty(VMContext), ColumnNo)
diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 38fc90f..8a0fb8d 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -695,6 +695,10 @@ DIArray DISubprogram::getVariables() const {
   return DIArray();
 }
 
+Value *DITemplateValueParameter::getValue() const {
+  return getField(DbgNode, 4);
+}
+
 void DIScope::setFilename(StringRef Name, LLVMContext &Context) {
   if (!DbgNode)
     return;