[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, 8 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/StackProtector.cpp b/llvm/lib/CodeGen/StackProtector.cpp
index a8aafe7..5da7726 100644
--- a/llvm/lib/CodeGen/StackProtector.cpp
+++ b/llvm/lib/CodeGen/StackProtector.cpp
@@ -58,12 +58,13 @@ static cl::opt<bool> EnableSelectionDAGSP("enable-selectiondag-sp",
                                           cl::init(true), cl::Hidden);
 
 char StackProtector::ID = 0;
-INITIALIZE_TM_PASS(StackProtector, "stack-protector", "Insert stack protectors",
-                   false, true)
+INITIALIZE_PASS_BEGIN(StackProtector, "stack-protector",
+                      "Insert stack protectors", false, true)
+INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
+INITIALIZE_PASS_END(StackProtector, "stack-protector",
+                    "Insert stack protectors", false, true)
 
-FunctionPass *llvm::createStackProtectorPass(const TargetMachine *TM) {
-  return new StackProtector(TM);
-}
+FunctionPass *llvm::createStackProtectorPass() { return new StackProtector(); }
 
 StackProtector::SSPLayoutKind
 StackProtector::getSSPLayout(const AllocaInst *AI) const {
@@ -97,6 +98,8 @@ bool StackProtector::runOnFunction(Function &Fn) {
   DominatorTreeWrapperPass *DTWP =
       getAnalysisIfAvailable<DominatorTreeWrapperPass>();
   DT = DTWP ? &DTWP->getDomTree() : nullptr;
+  TM = &getAnalysis<TargetPassConfig>().getTM<TargetMachine>();
+  Trip = TM->getTargetTriple();
   TLI = TM->getSubtargetImpl(Fn)->getTargetLowering();
   HasPrologue = false;
   HasIRCheck = false;