lib/Debugger/SourceLanguage-Unknown.cpp

   1 //===-- SourceLanguage-Unknown.cpp - Implement itf for unknown languages --===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // If the LLVM debugger does not have a module for a particular language, it
  11 // falls back on using this one to perform the source-language interface.  This
  12 // interface is not wonderful, but it gets the job done.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "llvm/Debugger/SourceLanguage.h"
  17 #include "llvm/Debugger/ProgramInfo.h"
  18 #include "llvm/Support/raw_ostream.h"
  19 #include <cassert>
  20 using namespace llvm;
  21
  22 //===----------------------------------------------------------------------===//
  23 // Implement the SourceLanguage cache for the Unknown language.
  24 //
  25
  26 namespace {
  27   /// SLUCache - This cache allows for efficient lookup of source functions by
  28   /// name.
  29   ///
  30   struct SLUCache : public SourceLanguageCache {
  31     ProgramInfo &PI;
  32     std::multimap<std::string, SourceFunctionInfo*> FunctionMap;
  33   public:
  34     SLUCache(ProgramInfo &pi);
  35
  36     typedef std::multimap<std::string, SourceFunctionInfo*>::const_iterator
  37        fm_iterator;
  38
  39     std::pair<fm_iterator, fm_iterator>
  40     getFunction(const std::string &Name) const {
  41       return FunctionMap.equal_range(Name);
  42     }
  43
  44     SourceFunctionInfo *addSourceFunction(SourceFunctionInfo *SF) {
  45       FunctionMap.insert(std::make_pair(SF->getSymbolicName(), SF));
  46       return SF;
  47     }
  48   };
  49 }
  50
  51 SLUCache::SLUCache(ProgramInfo &pi) : PI(pi) {
  52 }
  53
  54
  55 //===----------------------------------------------------------------------===//
  56 // Implement SourceLanguageUnknown class, which is used to handle unrecognized
  57 // languages.
  58 //
  59
  60 namespace {
  61   static struct SLU : public SourceLanguage {
  62     //===------------------------------------------------------------------===//
  63     // Implement the miscellaneous methods...
  64     //
  65     virtual const char *getSourceLanguageName() const {
  66       return "unknown";
  67     }
  68
  69     /// lookupFunction - Given a textual function name, return the
  70     /// SourceFunctionInfo descriptor for that function, or null if it cannot be
  71     /// found.  If the program is currently running, the RuntimeInfo object
  72     /// provides information about the current evaluation context, otherwise it
  73     /// will be null.
  74     ///
  75     virtual SourceFunctionInfo *lookupFunction(const std::string &FunctionName,
  76                                                ProgramInfo &PI,
  77                                                RuntimeInfo *RI = 0) const;
  78
  79     //===------------------------------------------------------------------===//
  80     // We do use a cache for information...
  81     //
  82     typedef SLUCache CacheType;
  83     SLUCache *createSourceLanguageCache(ProgramInfo &PI) const {
  84       return new SLUCache(PI);
  85     }
  86
  87     /// createSourceFunctionInfo - Create the new object and inform the cache of
  88     /// the new function.
  89     virtual SourceFunctionInfo *
  90     createSourceFunctionInfo(const GlobalVariable *Desc, ProgramInfo &PI) const;
  91
  92   } TheUnknownSourceLanguageInstance;
  93 }
  94
  95 const SourceLanguage &SourceLanguage::getUnknownLanguageInstance() {
  96   return TheUnknownSourceLanguageInstance;
  97 }
  98
  99
 100 SourceFunctionInfo *
 101 SLU::createSourceFunctionInfo(const GlobalVariable *Desc,
 102                               ProgramInfo &PI) const {
 103   SourceFunctionInfo *Result = new SourceFunctionInfo(PI, Desc);
 104   return PI.getLanguageCache(this).addSourceFunction(Result);
 105 }
 106
 107
 108 /// lookupFunction - Given a textual function name, return the
 109 /// SourceFunctionInfo descriptor for that function, or null if it cannot be
 110 /// found.  If the program is currently running, the RuntimeInfo object
 111 /// provides information about the current evaluation context, otherwise it will
 112 /// be null.
 113 ///
 114 SourceFunctionInfo *SLU::lookupFunction(const std::string &FunctionName,
 115                                         ProgramInfo &PI, RuntimeInfo *RI) const{
 116   SLUCache &Cache = PI.getLanguageCache(this);
 117   std::pair<SLUCache::fm_iterator, SLUCache::fm_iterator> IP
 118     = Cache.getFunction(FunctionName);
 119
 120   if (IP.first == IP.second) {
 121     if (PI.allSourceFunctionsRead())
 122       return 0;  // Nothing found
 123
 124     // Otherwise, we might be able to find the function if we read all of them
 125     // in.  Do so now.
 126     PI.getSourceFunctions();
 127     assert(PI.allSourceFunctionsRead() && "Didn't read in all functions?");
 128     return lookupFunction(FunctionName, PI, RI);
 129   }
 130
 131   SourceFunctionInfo *Found = IP.first->second;
 132   ++IP.first;
 133   if (IP.first != IP.second)
 134     outs() << "Whoa, found multiple functions with the same name.  I should"
 135          << " ask the user which one to use: FIXME!\n";
 136   return Found;
 137 }