Added source file/line correspondence for dwarf (PowerPC only at this point.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24748 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineDebugInfo.h

@@ -0,0 +1,80 @@
+//===-- llvm/CodeGen/MachineDebugInfo.h -------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by James M. Laskey and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Collect debug information for a module.  This information should be in a
+// neutral form that can be used by different debugging schemes.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_MACHINEDEBUGINFO_H
+#define LLVM_CODEGEN_MACHINEDEBUGINFO_H
+
+#include <string>
+#include <map>
+#include <vector>
+
+namespace llvm {
+//===----------------------------------------------------------------------===//
+/// MachineDebugInfo - This class contains debug information specific to a
+/// module.  Queries can be made by different debugging schemes and reformated
+/// for specific use.
+///
+class MachineDebugInfo {
+private:
+  // convenience types
+  typedef std::map<std::string, unsigned> StrIntMap;
+  typedef StrIntMap::iterator StrIntMapIter;
+  
+  StrIntMap SourceMap;                  // Map of source file path to id
+  unsigned SourceCount;                 // Number of source files (used to
+                                        // generate id)
+
+public:
+  // Ctor.
+  MachineDebugInfo() : SourceMap(), SourceCount(0) {}
+  
+  /// RecordSource - Register a source file with debug info.  Returns an id.
+  ///
+  unsigned RecordSource(std::string fname, std::string dirname) {
+    // Compose a key
+    std::string path = dirname + "/" + fname;
+    // Check if the source file is already recorded
+    StrIntMapIter SMI = SourceMap.find(path);
+    // If already there return existing id
+    if (SMI != SourceMap.end()) return SMI->second;
+    // Bump up the count
+    ++SourceCount;
+    // Record the count
+    SourceMap[path] = SourceCount;
+    // Return id
+    return SourceCount;
+  }
+
+  /// getSourceFiles - Return a vector of files.  Vector index + 1 equals id.
+  ///
+  std::vector<std::string> getSourceFiles() {
+    std::vector<std::string> Sources(SourceCount);
+    
+    for (StrIntMapIter SMI = SourceMap.begin(), E = SourceMap.end(); SMI != E;
+                       SMI++) {
+      unsigned Index = SMI->second - 1;
+      std::string Path = SMI->first;
+      Sources[Index] = Path;
+    }
+    return Sources;
+  }
+  
+}; // End class MachineDebugInfo
+//===----------------------------------------------------------------------===//
+
+
+
+} // End llvm namespace
+
+#endif

include/llvm/CodeGen/MachineFunction.h

@@ -18,6 +18,7 @@
 #ifndef LLVM_CODEGEN_MACHINEFUNCTION_H
 #define LLVM_CODEGEN_MACHINEFUNCTION_H
 
+#include "llvm/CodeGen/MachineDebugInfo.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/Support/Annotation.h"
 
@@ -112,6 +113,10 @@ class MachineFunction : private Annotation {
   /// stored in the second element.
   std::vector<std::pair<unsigned, unsigned> > LiveIns;
   std::vector<unsigned> LiveOuts;
+  
+  /// DebugInfo - Keep track of debug information for the function.
+  ///
+  MachineDebugInfo DebugInfo;
 
 public:
   MachineFunction(const Function *Fn, const TargetMachine &TM);
@@ -212,6 +217,11 @@ public:
   const MachineBasicBlock *getLastBlock() const {
     return MBBNumbering.back();
   }
+  
+  /// getDebugInfo - Returns the DebugInfo.
+  MachineDebugInfo &getDebugInfo() {
+    return DebugInfo;
+  }
 
   /// print - Print out the MachineFunction in a format suitable for debugging
   /// to the specified stream.

include/llvm/CodeGen/SelectionDAGNodes.h

@@ -352,6 +352,12 @@ namespace ISD {
     // as output.
     LOCATION,
     
+    // DEBUG_LOC - This node is used to represent source line information
+    // embedded in the code.  It takes token chain as input, then a line number,
+    // then a column then a file id (provided by MachineDebugInfo.  It produces
+    // a token chain as output.
+    DEBUG_LOC,
+    
     // BUILTIN_OP_END - This must be the last enum value in this list.
     BUILTIN_OP_END,
   };