Misc enhancements to LTO:

  1. Add some helper classes for partitions. They are designed in a
     way such that the top-level LTO driver will not see much difference 
     with or without partitioning.

  2. Introduce work-dir. Now all intermediate files generated during 
     LTO phases will be saved under work-dir. User can specify the workdir
     via -lto-workdir=/path/to/dir. By default the work-dir will be 
     erased before linker exit. To keep the workdir, do -lto-keep, or -lto-keep=1.

    TODO: Erase the workdir, if the linker exit prematurely.  
      We are currently not able to remove directory on signal. The support 
      routines simply ignore directory.

  3. Add one new API lto_codegen_get_files_need_remove().
     Linker and LTO plugin will communicate via this API about which files
    (including directories) need to removed before linker exit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188188 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 52 insertions, 0 deletions

diff --git a/tools/lto/LTOPostIPODriver.h b/tools/lto/LTOPostIPODriver.h
new file mode 100644
index 0000000000..c1813b9989
--- /dev/null
+++ b/tools/lto/LTOPostIPODriver.h
@@ -0,0 +1,52 @@
+//===---------- LTOPostIPODriver.h - PostIPO Driver -----------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file declare the PostIPODriver class which is the driver for 
+// Post-IPO compilation phase.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LTO_POSTIPO_DRIVER_H
+#define LTO_POSTIPO_DRIVER_H
+
+#include "llvm/Target/TargetMachine.h"
+
+namespace lto {
+  class IPOPartMgr;
+  class IPOFileMgr;
+  class IPOFile;
+
+  class PostIPODriver {
+  public:
+    typedef enum {
+      PIDV_Invalid,
+      PIDV_SERIAL,      // No partition
+      PIDV_MultiThread, // Each partition is compiled by a thread
+      PIDV_MultiProc,   // Each partition is compiled by a process
+      PIDV_MakeUtil     // Partitions compilation is driven by a make-utility
+    } VariantTy;
+
+    PostIPODriver(VariantTy Var, TargetMachine *TM, IPOPartMgr &IPM,
+                  IPOFileMgr &IFM, bool ToMergeObjs = false);
+  
+    // Return the single resulting object file. If there is no prior
+    // compilation failure, this function may return NULL iff:
+    //   1) Partition is enabled, and 
+    //   2) Multiple partitions are generated, and
+    //   3) It is not asked to merge together the objects corresponding to the
+    //      the partions.
+    IPOFile *getSingleObjFile() const;
+  
+    bool Compile(std::string &ErrMsg);
+
+  private:
+    void *DrvImpl;
+    VariantTy DrvStyle;
+  };
+}
+
+#endif // LTO_POSTIPO_DRIVER_H