Extend TargetPassConfig to allow running only a subset of the normal passes.

This is still a work in progress but I believe it is currently good enough
to fix PR13122 "Need unit test driver for codegen IR passes".  For example,
you can run llc with -stop-after=loop-reduce to have it dump out the IR after
running LSR.  Serializing machine-level IR is not yet supported but we have
some patches in progress for that.

The plan is to serialize the IR to a YAML file, containing separate sections
for the LLVM IR, machine-level IR, and whatever other info is needed.  Chad
suggested that we stash the stop-after pass in the YAML file and use that
instead of the start-after option to figure out where to restart the
compilation.  I think that's a great idea, but since it's not implemented yet
I put the -start-after option into this patch for testing purposes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159570 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 2 deletions

diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h
index 1a0560478a..e4bf32bd86 100644
--- a/include/llvm/Target/TargetMachine.h
+++ b/include/llvm/Target/TargetMachine.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_TARGET_TARGETMACHINE_H
 #define LLVM_TARGET_TARGETMACHINE_H
 
+#include "llvm/Pass.h"
 #include "llvm/Support/CodeGen.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/ADT/StringRef.h"
@@ -247,7 +248,9 @@ public:
   virtual bool addPassesToEmitFile(PassManagerBase &,
                                    formatted_raw_ostream &,
                                    CodeGenFileType,
-                                   bool /*DisableVerify*/ = true) {
+                                   bool /*DisableVerify*/ = true,
+                                   AnalysisID StartAfter = 0,
+                                   AnalysisID StopAfter = 0) {
     return true;
   }
 
@@ -297,7 +300,9 @@ public:
   virtual bool addPassesToEmitFile(PassManagerBase &PM,
                                    formatted_raw_ostream &Out,
                                    CodeGenFileType FileType,
-                                   bool DisableVerify = true);
+                                   bool DisableVerify = true,
+                                   AnalysisID StartAfter = 0,
+                                   AnalysisID StopAfter = 0);
 
   /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
   /// get machine code emitted.  This uses a JITCodeEmitter object to handle