[LPM] Stop using the string based preservation API. It is an

abomination.

For starters, this API is incredibly slow. In order to lookup the name
of a pass it must take a memory fence to acquire a pointer to the
managed static pass registry, and then potentially acquire locks while
it consults this registry for information about what passes exist by
that name. This stops the world of LLVMs in your process no matter
how little they cared about the result.

To make this more joyful, you'll note that we are preserving many passes
which *do not exist* any more, or are not even analyses which one might
wish to have be preserved. This means we do all the work only to say
"nope" with no error to the user.

String-based APIs are a *bad idea*. String-based APIs that cannot
produce any meaningful error are an even worse idea. =/

I have a patch that simply removes this API completely, but I'm hesitant
to commit it as I don't really want to perniciously break out-of-tree
users of the old pass manager. I'd rather they just have to migrate to
the new one at some point. If others disagree and would like me to kill
it with fire, just say the word. =]

llvm-svn: 227294

7 files changed, 25 insertions, 17 deletions

diff --git a/llvm/lib/CodeGen/MachineFunctionPass.cpp b/llvm/lib/CodeGen/MachineFunctionPass.cpp
index 789f2042a07..ee948184aff 100644
--- a/llvm/lib/CodeGen/MachineFunctionPass.cpp
+++ b/llvm/lib/CodeGen/MachineFunctionPass.cpp
@@ -11,11 +11,19 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/IR/Function.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/DominanceFrontier.h"
+#include "llvm/Analysis/IVUsers.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/MemoryDependenceAnalysis.h"
+#include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
-#include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/StackProtector.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Function.h"
 using namespace llvm;
 
 Pass *MachineFunctionPass::createPrinterPass(raw_ostream &O,
@@ -43,15 +51,13 @@ void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
   // because CodeGen overloads that to mean preserving the MachineBasicBlock
   // CFG in addition to the LLVM IR CFG.
   AU.addPreserved<AliasAnalysis>();
-  AU.addPreserved("scalar-evolution");
-  AU.addPreserved("iv-users");
-  AU.addPreserved("memdep");
-  AU.addPreserved("live-values");
-  AU.addPreserved("domtree");
-  AU.addPreserved("domfrontier");
-  AU.addPreserved("loops");
-  AU.addPreserved("lda");
-  AU.addPreserved("stack-protector");
+  AU.addPreserved<DominanceFrontier>();
+  AU.addPreserved<DominatorTreeWrapperPass>();
+  AU.addPreserved<IVUsers>();
+  AU.addPreserved<LoopInfoWrapperPass>();
+  AU.addPreserved<MemoryDependenceAnalysis>();
+  AU.addPreserved<ScalarEvolution>();
+  AU.addPreserved<StackProtector>();
 
   FunctionPass::getAnalysisUsage(AU);
 }
diff --git a/llvm/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp b/llvm/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp
index 2b459a4336b..0c240750886 100644
--- a/llvm/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonRemoveSZExtArgs.cpp
@@ -15,6 +15,7 @@
 #include "Hexagon.h"
 #include "HexagonTargetMachine.h"
 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
+#include "llvm/CodeGen/StackProtector.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/Pass.h"
@@ -42,7 +43,7 @@ namespace {
     void getAnalysisUsage(AnalysisUsage &AU) const override {
       AU.addRequired<MachineFunctionAnalysis>();
       AU.addPreserved<MachineFunctionAnalysis>();
-      AU.addPreserved("stack-protector");
+      AU.addPreserved<StackProtector>();
       FunctionPass::getAnalysisUsage(AU);
     }
   };
diff --git a/llvm/lib/Target/NVPTX/NVPTXAllocaHoisting.h b/llvm/lib/Target/NVPTX/NVPTXAllocaHoisting.h
index 69fc86e7541..c343980c501 100644
--- a/llvm/lib/Target/NVPTX/NVPTXAllocaHoisting.h
+++ b/llvm/lib/Target/NVPTX/NVPTXAllocaHoisting.h
@@ -15,6 +15,7 @@
 #define LLVM_LIB_TARGET_NVPTX_NVPTXALLOCAHOISTING_H
 
 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
+#include "llvm/CodeGen/StackProtector.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/Pass.h"
 
@@ -32,8 +33,8 @@ public:
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addRequired<DataLayoutPass>();
-    AU.addPreserved("stack-protector");
     AU.addPreserved<MachineFunctionAnalysis>();
+    AU.addPreserved<StackProtector>();
   }
 
   const char *getPassName() const override {
diff --git a/llvm/lib/Target/NVPTX/NVPTXLowerAggrCopies.h b/llvm/lib/Target/NVPTX/NVPTXLowerAggrCopies.h
index 8759406a680..da301d5de62 100644
--- a/llvm/lib/Target/NVPTX/NVPTXLowerAggrCopies.h
+++ b/llvm/lib/Target/NVPTX/NVPTXLowerAggrCopies.h
@@ -16,6 +16,7 @@
 #define LLVM_LIB_TARGET_NVPTX_NVPTXLOWERAGGRCOPIES_H
 
 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
+#include "llvm/CodeGen/StackProtector.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/Pass.h"
 
@@ -29,8 +30,8 @@ struct NVPTXLowerAggrCopies : public FunctionPass {
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addRequired<DataLayoutPass>();
-    AU.addPreserved("stack-protector");
     AU.addPreserved<MachineFunctionAnalysis>();
+    AU.addPreserved<StackProtector>();
   }
 
   bool runOnFunction(Function &F) override;
diff --git a/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp b/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp
index 9b7065b354c..6dc600e6614 100644
--- a/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Analysis/InstructionSimplify.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Instructions.h"
@@ -47,7 +48,7 @@ namespace {
       AU.addRequiredID(LoopSimplifyID);
       AU.addPreservedID(LoopSimplifyID);
       AU.addPreservedID(LCSSAID);
-      AU.addPreserved("scalar-evolution");
+      AU.addPreserved<ScalarEvolution>();
       AU.addRequired<TargetLibraryInfoWrapperPass>();
     }
   };
diff --git a/llvm/lib/Transforms/Utils/LowerSwitch.cpp b/llvm/lib/Transforms/Utils/LowerSwitch.cpp
index 0a1e138e1b3..e8e811dd555 100644
--- a/llvm/lib/Transforms/Utils/LowerSwitch.cpp
+++ b/llvm/lib/Transforms/Utils/LowerSwitch.cpp
@@ -63,7 +63,6 @@ namespace {
     void getAnalysisUsage(AnalysisUsage &AU) const override {
       // This is a cluster of orthogonal Transforms
       AU.addPreserved<UnifyFunctionExitNodes>();
-      AU.addPreserved("mem2reg");
       AU.addPreservedID(LowerInvokePassID);
     }
 
diff --git a/llvm/lib/Transforms/Utils/UnifyFunctionExitNodes.cpp b/llvm/lib/Transforms/Utils/UnifyFunctionExitNodes.cpp
index 0c2fc0a972b..7e00a80989d 100644
--- a/llvm/lib/Transforms/Utils/UnifyFunctionExitNodes.cpp
+++ b/llvm/lib/Transforms/Utils/UnifyFunctionExitNodes.cpp
@@ -35,7 +35,6 @@ void UnifyFunctionExitNodes::getAnalysisUsage(AnalysisUsage &AU) const{
   // We preserve the non-critical-edgeness property
   AU.addPreservedID(BreakCriticalEdgesID);
   // This is a cluster of orthogonal Transforms
-  AU.addPreserved("mem2reg");
   AU.addPreservedID(LowerSwitchID);
 }