This patch extends the libLLVMDebugInfo which contains a minimalistic DWARF parser:

1) DIContext is now able to return function name for a given instruction address (besides file/line info).
2) llvm-dwarfdump accepts flag --functions that prints the function name (if address is specified by --address flag).
3) test case that checks the basic functionality of llvm-dwarfdump added

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159512 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 29 insertions, 5 deletions

diff --git a/include/llvm/DebugInfo/DIContext.h b/include/llvm/DebugInfo/DIContext.h
index 64f80c5..6377acb 100644
--- a/include/llvm/DebugInfo/DIContext.h
+++ b/include/llvm/DebugInfo/DIContext.h
@@ -26,26 +26,49 @@ class raw_ostream;
 /// DILineInfo - a format-neutral container for source line information.
 class DILineInfo {
   const char *FileName;
+  const char *FunctionName;
   uint32_t Line;
   uint32_t Column;
 public:
-  DILineInfo() : FileName("<invalid>"), Line(0), Column(0) {}
-  DILineInfo(const char *fileName, uint32_t line, uint32_t column)
-    : FileName(fileName), Line(line), Column(column) {}
+  DILineInfo()
+    : FileName("<invalid>"), FunctionName("<invalid>"),
+      Line(0), Column(0) {}
+  DILineInfo(const char *fileName, const char *functionName,
+             uint32_t line, uint32_t column)
+    : FileName(fileName), FunctionName(functionName),
+      Line(line), Column(column) {}
 
   const char *getFileName() const { return FileName; }
+  const char *getFunctionName() const { return FunctionName; }
   uint32_t getLine() const { return Line; }
   uint32_t getColumn() const { return Column; }
 
   bool operator==(const DILineInfo &RHS) const {
     return Line == RHS.Line && Column == RHS.Column &&
-           std::strcmp(FileName, RHS.FileName) == 0;
+           std::strcmp(FileName, RHS.FileName) == 0 &&
+           std::strcmp(FunctionName, RHS.FunctionName) == 0;
   }
   bool operator!=(const DILineInfo &RHS) const {
     return !(*this == RHS);
   }
 };
 
+/// DILineInfoSpecifier - controls which fields of DILineInfo container
+/// should be filled with data.
+class DILineInfoSpecifier {
+  const uint32_t Flags;  // Or'ed flags that set the info we want to fetch.
+public:
+  enum Specification {
+    FileLineInfo = 1 << 0,
+    FunctionName = 1 << 1
+  };
+  // Use file/line info by default.
+  DILineInfoSpecifier(uint32_t flags = FileLineInfo) : Flags(flags) {}
+  bool needs(Specification spec) const {
+    return (Flags & spec) > 0;
+  }
+};
+
 class DIContext {
 public:
   virtual ~DIContext();
@@ -60,7 +83,8 @@ public:
 
   virtual void dump(raw_ostream &OS) = 0;
 
-  virtual DILineInfo getLineInfoForAddress(uint64_t address) = 0;
+  virtual DILineInfo getLineInfoForAddress(uint64_t address,
+      DILineInfoSpecifier specifier = DILineInfoSpecifier()) = 0;
 };
 
 }