Support: Add dwarf::getAttributeEncoding()

llvm-svn: 228470

llvm/include/llvm/Support/Dwarf.h

@@ -749,6 +749,7 @@ const char *GDBIndexEntryLinkageString(GDBIndexEntryLinkage Linkage);
 /// @{
 unsigned getTag(StringRef TagString);
 unsigned getLanguage(StringRef LanguageString);
+unsigned getAttributeEncoding(StringRef EncodingString);
 /// @}
 
 /// \brief Returns the symbolic string representing Val when used as a value

llvm/lib/Support/Dwarf.cpp

@@ -414,6 +414,13 @@ const char *llvm::dwarf::AttributeEncodingString(unsigned Encoding) {
   }
 }
 
+unsigned llvm::dwarf::getAttributeEncoding(StringRef EncodingString) {
+  return StringSwitch<unsigned>(EncodingString)
+#define HANDLE_DW_ATE(ID, NAME) .Case("DW_ATE_" #NAME, DW_ATE_##NAME)
+#include "llvm/Support/Dwarf.def"
+      .Default(0);
+}
+
 const char *llvm::dwarf::DecimalSignString(unsigned Sign) {
   switch (Sign) {
   case DW_DS_unsigned:                   return "DW_DS_unsigned";

llvm/unittests/Support/DwarfTest.cpp

@@ -79,4 +79,20 @@ TEST(DwarfTest, AttributeEncodingStringOnInvalid) {
   EXPECT_EQ(nullptr, AttributeEncodingString(DW_ATE_hi_user));
 }
 
+TEST(DwarfTest, getAttributeEncoding) {
+  // A couple of valid languages.
+  EXPECT_EQ(DW_ATE_boolean, getAttributeEncoding("DW_ATE_boolean"));
+  EXPECT_EQ(DW_ATE_imaginary_float,
+            getAttributeEncoding("DW_ATE_imaginary_float"));
+
+  // Invalid languages.
+  EXPECT_EQ(0u, getAttributeEncoding("DW_ATE_invalid"));
+  EXPECT_EQ(0u, getAttributeEncoding("DW_TAG_array_type"));
+  EXPECT_EQ(0u, getAttributeEncoding("something else"));
+
+  // AttributeEncoding range markers should not be recognized.
+  EXPECT_EQ(0u, getAttributeEncoding("DW_ATE_lo_user"));
+  EXPECT_EQ(0u, getAttributeEncoding("DW_ATE_hi_user"));
+}
+
 } // end namespace