Vendor import of llvm tags/RELEASE_33/final r183502 (effectively, 3.3

release):
http://llvm.org/svn/llvm-project/llvm/tags/RELEASE_33/final@183502

1 files changed, 21 insertions, 124 deletions

diff --git a/include/llvm/Linker.h b/include/llvm/Linker.h
index 6796384..3667b85 100644
--- a/include/llvm/Linker.h
+++ b/include/llvm/Linker.h
@@ -10,149 +10,46 @@
 #ifndef LLVM_LINKER_H
 #define LLVM_LINKER_H
 
-#include <memory>
+#include "llvm/ADT/SmallPtrSet.h"
 #include <string>
-#include <vector>
 
 namespace llvm {
 
 class Module;
-class LLVMContext;
 class StringRef;
+class StructType;
 
-/// This class provides the core functionality of linking in LLVM. It retains a
-/// Module object which is the composite of the modules and libraries linked
-/// into it. The composite Module can be retrieved via the getModule() method.
-/// In this case the Linker still retains ownership of the Module. If the
-/// releaseModule() method is used, the ownership of the Module is transferred
-/// to the caller and the Linker object is only suitable for destruction.
-/// The Linker can link Modules from memory. By default, the linker
-/// will generate error and warning messages to stderr but this capability can
-/// be turned off with the QuietWarnings and QuietErrors flags. It can also be
-/// instructed to verbosely print out the linking actions it is taking with
-/// the Verbose flag.
-/// @brief The LLVM Linker.
+/// This class provides the core functionality of linking in LLVM. It keeps a
+/// pointer to the merged module so far. It doesn't take ownership of the
+/// module since it is assumed that the user of this class will want to do
+/// something with it after the linking.
 class Linker {
-
-  /// @name Types
-  /// @{
   public:
-    /// This enumeration is used to control various optional features of the
-    /// linker.
-    enum ControlFlags {
-      Verbose       = 1, ///< Print to stderr what steps the linker is taking
-      QuietWarnings = 2, ///< Don't print warnings to stderr.
-      QuietErrors   = 4  ///< Don't print errors to stderr.
-    };
-
     enum LinkerMode {
       DestroySource = 0, // Allow source module to be destroyed.
       PreserveSource = 1 // Preserve the source module.
     };
 
-  /// @}
-  /// @name Constructors
-  /// @{
-  public:
-    /// Construct the Linker with an empty module which will be given the
-    /// name \p progname. \p progname will also be used for error messages.
-    /// @brief Construct with empty module
-    Linker(StringRef progname, ///< name of tool running linker
-           StringRef modulename, ///< name of linker's end-result module
-           LLVMContext &C, ///< Context for global info
-           unsigned Flags = 0  ///< ControlFlags (one or more |'d together)
-    );
-
-    /// Construct the Linker with a previously defined module, \p aModule. Use
-    /// \p progname for the name of the program in error messages.
-    /// @brief Construct with existing module
-    Linker(StringRef progname, Module* aModule, unsigned Flags = 0);
-
-    /// Destruct the Linker.
-    /// @brief Destructor
+    Linker(Module *M);
     ~Linker();
-
-  /// @}
-  /// @name Accessors
-  /// @{
-  public:
-    /// This method gets the composite module into which linking is being
-    /// done. The Composite module starts out empty and accumulates modules
-    /// linked into it via the various LinkIn* methods. This method does not
-    /// release the Module to the caller. The Linker retains ownership and will
-    /// destruct the Module when the Linker is destructed.
-    /// @see releaseModule
-    /// @brief Get the linked/composite module.
-    Module* getModule() const { return Composite; }
-
-    /// This method releases the composite Module into which linking is being
-    /// done. Ownership of the composite Module is transferred to the caller who
-    /// must arrange for its destruct. After this method is called, the Linker
-    /// terminates the linking session for the returned Module. It will no
-    /// longer utilize the returned Module but instead resets itself for
-    /// subsequent linking as if the constructor had been called.
-    /// @brief Release the linked/composite module.
-    Module* releaseModule();
-
-    /// This method returns an error string suitable for printing to the user.
-    /// The return value will be empty unless an error occurred in one of the
-    /// LinkIn* methods. In those cases, the LinkIn* methods will have returned
-    /// true, indicating an error occurred. At most one error is retained so
-    /// this function always returns the last error that occurred. Note that if
-    /// the Quiet control flag is not set, the error string will have already
-    /// been printed to stderr.
-    /// @brief Get the text of the last error that occurred.
-    const std::string &getLastError() const { return Error; }
-
-  /// @}
-  /// @name Mutators
-  /// @{
-  public:
-    /// This method links the \p Src module into the Linker's Composite module
-    /// by calling LinkModules.
-    /// @see LinkModules
-    /// @returns True if an error occurs, false otherwise.
-    /// @brief Link in a module.
-    bool LinkInModule(
-      Module* Src,              ///< Module linked into \p Dest
-      std::string* ErrorMsg = 0 /// Error/diagnostic string
-    ) {
-      return LinkModules(Composite, Src, Linker::DestroySource, ErrorMsg);
+    Module *getModule() const { return Composite; }
+
+    /// \brief Link \p Src into the composite. The source is destroyed if
+    /// \p Mode is DestroySource and preserved if it is PreserveSource.
+    /// If \p ErrorMsg is not null, information about any error is written
+    /// to it.
+    /// Returns true on error.
+    bool linkInModule(Module *Src, unsigned Mode, std::string *ErrorMsg);
+    bool linkInModule(Module *Src, std::string *ErrorMsg) {
+      return linkInModule(Src, Linker::DestroySource, ErrorMsg);
     }
 
-    /// This is the heart of the linker. This method will take unconditional
-    /// control of the \p Src module and link it into the \p Dest module. The
-    /// \p Src module will be destructed or subsumed by this method. In either
-    /// case it is not usable by the caller after this method is invoked. Only
-    /// the \p Dest module will remain. The \p Src module is linked into the
-    /// Linker's composite module such that types, global variables, functions,
-    /// and etc. are matched and resolved.  If an error occurs, this function
-    /// returns true and ErrorMsg is set to a descriptive message about the
-    /// error.
-    /// @returns True if an error occurs, false otherwise.
-    /// @brief Generically link two modules together.
-    static bool LinkModules(Module* Dest, Module* Src, unsigned Mode,
-                            std::string* ErrorMsg);
+    static bool LinkModules(Module *Dest, Module *Src, unsigned Mode,
+                            std::string *ErrorMsg);
 
-  /// @}
-  /// @name Implementation
-  /// @{
   private:
-    bool warning(StringRef message);
-    bool error(StringRef message);
-    void verbose(StringRef message);
-
-  /// @}
-  /// @name Data
-  /// @{
-  private:
-    LLVMContext& Context; ///< The context for global information
-    Module* Composite; ///< The composite module linked together
-    unsigned Flags;    ///< Flags to control optional behavior.
-    std::string Error; ///< Text of error that occurred.
-    std::string ProgramName; ///< Name of the program being linked
-  /// @}
-
+    Module *Composite;
+    SmallPtrSet<StructType*, 32> IdentifiedStructTypes;
 };
 
 } // End llvm namespace