From 7aa81897066a20ace12c8f61ae0e5a253fb64dc2 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Mon, 8 Mar 2010 22:27:22 +0000
Subject: [PATCH] Introduce DIFile. This will be used to represent header files
 and source file(s) in debug info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97994 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Analysis/DebugInfo.h | 16 ++++++++++++++++
 lib/Analysis/DebugInfo.cpp        | 23 +++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/llvm/Analysis/DebugInfo.h b/include/llvm/Analysis/DebugInfo.h
index c2061206ebb..41579586d98 100644
--- a/include/llvm/Analysis/DebugInfo.h
+++ b/include/llvm/Analysis/DebugInfo.h
@@ -87,6 +87,7 @@ namespace llvm {
     bool isSubprogram() const;
     bool isGlobalVariable() const;
     bool isScope() const;
+    bool isFile() const;
     bool isCompileUnit() const;
     bool isNameSpace() const;
     bool isLexicalBlock() const;
@@ -158,6 +159,18 @@ namespace llvm {
     void dump() const;
   };
 
+  /// DIFile - This is a wrapper for a file.
+  class DIFile : public DIScope {
+  public:
+    explicit DIFile(MDNode *N = 0) : DIScope(N) {
+      if (DbgNode && !isFile())
+        DbgNode = 0;
+    }
+    StringRef getFilename() const  { return getStringField(1);   }
+    StringRef getDirectory() const { return getStringField(2);   }
+    DICompileUnit getCompileUnit() const{ return getFieldAs<DICompileUnit>(3); }
+  };
+
   /// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
   /// FIXME: it seems strange that this doesn't have either a reference to the
   /// type/precision or a file/line pair for location info.
@@ -502,6 +515,9 @@ namespace llvm {
                                     StringRef Flags = "",
                                     unsigned RunTimeVer = 0);
 
+    /// CreateFile -  Create a new descriptor for the specified file.
+    DIFile CreateFile(StringRef Filename, StringRef Directory, DICompileUnit CU);
+
     /// CreateEnumerator - Create a single enumerator value.
     DIEnumerator CreateEnumerator(StringRef Name, uint64_t Val);
 
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 4ea1ce94b16..49b2e6b2c54 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -219,6 +219,11 @@ bool DIDescriptor::isCompileUnit() const {
   return DbgNode && getTag() == dwarf::DW_TAG_compile_unit;
 }
 
+/// isFile - Return true if the specified tag is DW_TAG_file_type.
+bool DIDescriptor::isFile() const {
+  return DbgNode && getTag() == dwarf::DW_TAG_file_type;
+}
+
 /// isNameSpace - Return true if the specified tag is DW_TAG_namespace.
 bool DIDescriptor::isNameSpace() const {
   return DbgNode && getTag() == dwarf::DW_TAG_namespace;
@@ -424,6 +429,8 @@ StringRef DIScope::getFilename() const {
     return DINameSpace(DbgNode).getFilename();
   if (isType())
     return DIType(DbgNode).getFilename();
+  if (isFile())
+    return DIFile(DbgNode).getFilename();
   assert(0 && "Invalid DIScope!");
   return StringRef();
 }
@@ -441,6 +448,8 @@ StringRef DIScope::getDirectory() const {
     return DINameSpace(DbgNode).getDirectory();
   if (isType())
     return DIType(DbgNode).getDirectory();
+  if (isFile())
+    return DIFile(DbgNode).getDirectory();
   assert(0 && "Invalid DIScope!");
   return StringRef();
 }
@@ -661,6 +670,20 @@ DICompileUnit DIFactory::CreateCompileUnit(unsigned LangID,
   return DICompileUnit(MDNode::get(VMContext, &Elts[0], 10));
 }
 
+/// CreateFile -  Create a new descriptor for the specified file.
+DIFile DIFactory::CreateFile(StringRef Filename,
+                             StringRef Directory,
+                             DICompileUnit CU) {
+  Value *Elts[] = {
+    GetTagConstant(dwarf::DW_TAG_file_type),
+    MDString::get(VMContext, Filename),
+    MDString::get(VMContext, Directory),
+    CU.getNode()
+  };
+
+  return DIFile(MDNode::get(VMContext, &Elts[0], 4));
+}
+
 /// CreateEnumerator - Create a single enumerator value.
 DIEnumerator DIFactory::CreateEnumerator(StringRef Name, uint64_t Val){
   Value *Elts[] = {
-- 
2.34.1