[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, 9 insertions, 11 deletions

diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
index 7b1706f..be3b258 100644
--- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -109,26 +109,24 @@ addPassesToGenerateCode(LLVMTargetMachine *TM, PassManagerBase &PM,
                         AnalysisID StopAfter,
                         MachineFunctionInitializer *MFInitializer = nullptr) {
 
-  // When in emulated TLS mode, add the LowerEmuTLS pass.
-  if (TM->Options.EmulatedTLS)
-    PM.add(createLowerEmuTLSPass(TM));
-
-  PM.add(createPreISelIntrinsicLoweringPass());
-
-  // Add internal analysis passes from the target machine.
-  PM.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
-
   // Targets may override createPassConfig to provide a target-specific
   // subclass.
   TargetPassConfig *PassConfig = TM->createPassConfig(PM);
   PassConfig->setStartStopPasses(StartBefore, StartAfter, StopBefore,
                                  StopAfter);
-
   // Set PassConfig options provided by TargetMachine.
   PassConfig->setDisableVerify(DisableVerify);
-
   PM.add(PassConfig);
 
+  // When in emulated TLS mode, add the LowerEmuTLS pass.
+  if (TM->Options.EmulatedTLS)
+    PM.add(createLowerEmuTLSPass());
+
+  PM.add(createPreISelIntrinsicLoweringPass());
+
+  // Add internal analysis passes from the target machine.
+  PM.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
+
   PassConfig->addIRPasses();
 
   PassConfig->addCodeGenPrepare();