Refactor some parser interfaces to fix PR3278 and a FIXME:

ParseAssemblyString with a specified module would not parse
into the module, it would create and return a new one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61635 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AsmParser/LLParser.cpp

@@ -51,19 +51,12 @@ namespace llvm {
 }
 
 /// Run: module ::= toplevelentity*
-Module *LLParser::Run() {
+bool LLParser::Run() {
-  M = new Module(Lex.getFilename());
-
   // Prime the lexer.
   Lex.Lex();
 
-  if (ParseTopLevelEntities() ||
+  return ParseTopLevelEntities() ||
-      ValidateEndOfModule()) {
+         ValidateEndOfModule();
-    delete M;
-    return 0;
-  }
-  
-  return M;
 }
 
 /// ValidateEndOfModule - Do final validity and sanity checks at the end of the

lib/AsmParser/LLParser.h

@@ -69,8 +69,8 @@ namespace llvm {
     std::map<unsigned, std::pair<GlobalValue*, LocTy> > ForwardRefValIDs;
     std::vector<GlobalValue*> NumberedVals;
   public:
-    LLParser(MemoryBuffer *F, ParseError &Err) : Lex(F, Err), M(0) {}
+    LLParser(MemoryBuffer *F, ParseError &Err, Module *m) : Lex(F, Err), M(m) {}
-    Module *Run();
+    bool Run();
 
   private:
 

lib/AsmParser/Parser.cpp

@@ -14,6 +14,7 @@
 #include "llvm/Assembly/Parser.h"
 #include "LLParser.h"
 #include "llvm/Module.h"
+#include "llvm/ADT/OwningPtr.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstring>
@@ -23,28 +24,36 @@ Module *llvm::ParseAssemblyFile(const std::string &Filename, ParseError &Err) {
   Err.setFilename(Filename);
 
   std::string ErrorStr;
-  MemoryBuffer *F = MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrorStr);
+  OwningPtr<MemoryBuffer>
+    F(MemoryBuffer::getFileOrSTDIN(Filename.c_str(), &ErrorStr));
   if (F == 0) {
     Err.setError("Could not open input file '" + Filename + "'");
     return 0;
   }
 
-  Module *Result = LLParser(F, Err).Run();
+  OwningPtr<Module> M(new Module(Filename));
-  delete F;
+  if (LLParser(F.get(), Err, M.get()).Run())
-  return Result;
+    return 0;
+  return M.take();
 }
 
-// FIXME: M is ignored??
 Module *llvm::ParseAssemblyString(const char *AsmString, Module *M,
                                   ParseError &Err) {
   Err.setFilename("<string>");
 
-  MemoryBuffer *F = MemoryBuffer::getMemBuffer(AsmString,
+  OwningPtr<MemoryBuffer>
-                                               AsmString+strlen(AsmString),
+    F(MemoryBuffer::getMemBuffer(AsmString, AsmString+strlen(AsmString),
-                                               "<string>");
+                                 "<string>"));
-  Module *Result = LLParser(F, Err).Run();
+  
-  delete F;
+  // If we are parsing into an existing module, do it.
-  return Result;
+  if (M)
+    return LLParser(F.get(), Err, M).Run() ? 0 : M;
+
+  // Otherwise create a new module.
+  OwningPtr<Module> M2(new Module("<string>"));
+  if (LLParser(F.get(), Err, M2.get()).Run())
+    return 0;
+  return M2.take();
 }