* Move some code from Pass.cpp to PassManagerT.h

* Implement stuff so that code can declare that they only depend on the CFG of
  a function, not on anything else.  This speeds up GCCAS a lot.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3155 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 28 insertions, 2 deletions

diff --git a/lib/VMCore/PassManagerT.h b/lib/VMCore/PassManagerT.h
index 6e5fcbd..555bcaa 100644
--- a/lib/VMCore/PassManagerT.h
+++ b/lib/VMCore/PassManagerT.h
@@ -16,11 +16,34 @@
 #define LLVM_PASSMANAGER_T_H
 
 #include "llvm/Pass.h"
-#include <string>
+#include "Support/CommandLine.h"
 #include <algorithm>
 class Annotable;
 
 //===----------------------------------------------------------------------===//
+// Pass debugging information.  Often it is useful to find out what pass is
+// running when a crash occurs in a utility.  When this library is compiled with
+// debugging on, a command line option (--debug-pass) is enabled that causes the
+// pass name to be printed before it executes.
+//
+
+// Different debug levels that can be enabled...
+enum PassDebugLevel {
+  None, Structure, Executions, Details
+};
+
+static cl::opt<enum PassDebugLevel>
+PassDebugging("debug-pass", cl::Hidden,
+              cl::desc("Print PassManager debugging information"),
+              cl::values(
+  clEnumVal(None      , "disable debug output"),
+  // TODO: add option to print out pass names "PassOptions"
+  clEnumVal(Structure , "print pass structure before run()"),
+  clEnumVal(Executions, "print pass name before it is executed"),
+  clEnumVal(Details   , "print pass details when it is executed"),
+                         0));
+
+//===----------------------------------------------------------------------===//
 // PMDebug class - a set of debugging functions, that are not to be
 // instantiated by the template.
 //
@@ -28,7 +51,10 @@ struct PMDebug {
   // If compiled in debug mode, these functions can be enabled by setting
   // -debug-pass on the command line of the tool being used.
   //
-  static void PrintPassStructure(Pass *P);
+  static void PrintPassStructure(Pass *P) {
+    if (PassDebugging >= Structure)
+      P->dumpPassStructure();
+  }
   static void PrintPassInformation(unsigned,const char*,Pass *, Annotable *);
   static void PrintAnalysisSetInfo(unsigned,const char*,Pass *P,
                                    const std::vector<AnalysisID> &);