[LegacyPassManager] Remove TargetMachine constructors

This provides a new way to access the TargetMachine through
TargetPassConfig, as a dependency.

The patterns replaced here are:

* Passes handling a null TargetMachine call
  `getAnalysisIfAvailable<TargetPassConfig>`.

* Passes not handling a null TargetMachine
  `addRequired<TargetPassConfig>` and call
  `getAnalysis<TargetPassConfig>`.

* MachineFunctionPasses now use MF.getTarget().

* Remove all the TargetMachine constructors.
* Remove INITIALIZE_TM_PASS.

This fixes a crash when running `llc -start-before prologepilog`.

PEI needs StackProtector, which gets constructed without a TargetMachine
by the pass manager. The StackProtector pass doesn't handle the case
where there is no TargetMachine, so it segfaults.

Related to PR30324.

Differential Revision: https://reviews.llvm.org/D33222

llvm-svn: 303360

1 files changed, 4 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/WinEHPrepare.cpp b/llvm/lib/CodeGen/WinEHPrepare.cpp
index ae07e8b..a632b40 100644
--- a/llvm/lib/CodeGen/WinEHPrepare.cpp
+++ b/llvm/lib/CodeGen/WinEHPrepare.cpp
@@ -54,7 +54,7 @@ namespace {
 class WinEHPrepare : public FunctionPass {
 public:
   static char ID; // Pass identification, replacement for typeid.
-  WinEHPrepare(const TargetMachine *TM = nullptr) : FunctionPass(ID) {}
+  WinEHPrepare() : FunctionPass(ID) {}
 
   bool runOnFunction(Function &Fn) override;
 
@@ -94,12 +94,10 @@ private:
 } // end anonymous namespace
 
 char WinEHPrepare::ID = 0;
-INITIALIZE_TM_PASS(WinEHPrepare, "winehprepare", "Prepare Windows exceptions",
-                   false, false)
+INITIALIZE_PASS(WinEHPrepare, "winehprepare", "Prepare Windows exceptions",
+                false, false)
 
-FunctionPass *llvm::createWinEHPass(const TargetMachine *TM) {
-  return new WinEHPrepare(TM);
-}
+FunctionPass *llvm::createWinEHPass() { return new WinEHPrepare(); }
 
 bool WinEHPrepare::runOnFunction(Function &Fn) {
   if (!Fn.hasPersonalityFn())