From 8b61764cbba4136e038fd94e035f1e965c82ba52 Mon Sep 17 00:00:00 2001
From: Francis Visoiu Mistrih <fvisoiumistrih@apple.com>
Date: Thu, 18 May 2017 17:21:13 +0000
Subject: [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
---
 llvm/lib/CodeGen/LowerEmuTLS.cpp | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

(limited to 'llvm/lib/CodeGen/LowerEmuTLS.cpp')

diff --git a/llvm/lib/CodeGen/LowerEmuTLS.cpp b/llvm/lib/CodeGen/LowerEmuTLS.cpp
index 6966c8ca4a5..5fb5b747f47 100644
--- a/llvm/lib/CodeGen/LowerEmuTLS.cpp
+++ b/llvm/lib/CodeGen/LowerEmuTLS.cpp
@@ -16,6 +16,7 @@
 
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Pass.h"
@@ -28,14 +29,12 @@ using namespace llvm;
 namespace {
 
 class LowerEmuTLS : public ModulePass {
-  const TargetMachine *TM;
 public:
   static char ID; // Pass identification, replacement for typeid
-  explicit LowerEmuTLS() : ModulePass(ID), TM(nullptr) { }
-  explicit LowerEmuTLS(const TargetMachine *TM)
-      : ModulePass(ID), TM(TM) {
+  LowerEmuTLS() : ModulePass(ID) {
     initializeLowerEmuTLSPass(*PassRegistry::getPassRegistry());
   }
+
   bool runOnModule(Module &M) override;
 private:
   bool addEmuTlsVar(Module &M, const GlobalVariable *GV);
@@ -55,18 +54,21 @@ private:
 char LowerEmuTLS::ID = 0;
 
 INITIALIZE_PASS(LowerEmuTLS, "loweremutls",
-                "Add __emutls_[vt]. variables for emultated TLS model",
-                false, false)
+                "Add __emutls_[vt]. variables for emultated TLS model", false,
+                false)
 
-ModulePass *llvm::createLowerEmuTLSPass(const TargetMachine *TM) {
-  return new LowerEmuTLS(TM);
-}
+ModulePass *llvm::createLowerEmuTLSPass() { return new LowerEmuTLS(); }
 
 bool LowerEmuTLS::runOnModule(Module &M) {
   if (skipModule(M))
     return false;
 
-  if (!TM || !TM->Options.EmulatedTLS)
+  auto *TPC = getAnalysisIfAvailable<TargetPassConfig>();
+  if (!TPC)
+    return false;
+
+  auto &TM = TPC->getTM<TargetMachine>();
+  if (!TM.Options.EmulatedTLS)
     return false;
 
   bool Changed = false;
-- 
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