From 35bb85b7ee108a265a20686e97d1b011f4ab5ce9 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 19 Apr 2010 22:51:14 +0000
Subject: [PATCH] Eliminate SelectionDAGISel's "current block" member. Just
 pass it as an argument to things that need it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101825 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/SelectionDAGISel.h       |  8 ++---
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 29 ++++++++++---------
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/include/llvm/CodeGen/SelectionDAGISel.h b/include/llvm/CodeGen/SelectionDAGISel.h
index 03d9bf5a9a5..8fddb54452d 100644
--- a/include/llvm/CodeGen/SelectionDAGISel.h
+++ b/include/llvm/CodeGen/SelectionDAGISel.h
@@ -46,7 +46,6 @@ public:
   MachineRegisterInfo *RegInfo;
   SelectionDAG *CurDAG;
   SelectionDAGBuilder *SDB;
-  MachineBasicBlock *BB;
   AliasAnalysis *AA;
   GCFunctionInfo *GFI;
   CodeGenOpt::Level OptLevel;
@@ -283,13 +282,14 @@ private:
   
   void PrepareEHLandingPad(MachineBasicBlock *BB);
   void SelectAllBasicBlocks(const Function &Fn);
-  void FinishBasicBlock();
+  void FinishBasicBlock(MachineBasicBlock *BB);
 
-  void SelectBasicBlock(const BasicBlock *LLVMBB,
+  void SelectBasicBlock(MachineBasicBlock *BB,
+                        const BasicBlock *LLVMBB,
                         BasicBlock::const_iterator Begin,
                         BasicBlock::const_iterator End,
                         bool &HadTailCall);
-  void CodeGenAndEmitDAG();
+  void CodeGenAndEmitDAG(MachineBasicBlock *BB);
   void LowerArguments(const BasicBlock *BB);
   
   void ShrinkDemandedOps();
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index ae39226153f..144abab772a 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -249,7 +249,8 @@ static void ResetDebugLoc(SelectionDAGBuilder *SDB, FastISel *FastIS) {
     FastIS->setCurDebugLoc(DebugLoc());
 }
 
-void SelectionDAGISel::SelectBasicBlock(const BasicBlock *LLVMBB,
+void SelectionDAGISel::SelectBasicBlock(MachineBasicBlock *BB,
+                                        const BasicBlock *LLVMBB,
                                         BasicBlock::const_iterator Begin,
                                         BasicBlock::const_iterator End,
                                         bool &HadTailCall) {
@@ -286,7 +287,7 @@ void SelectionDAGISel::SelectBasicBlock(const BasicBlock *LLVMBB,
   CurDAG->setRoot(SDB->getControlRoot());
 
   // Final step, emit the lowered DAG as machine code.
-  CodeGenAndEmitDAG();
+  CodeGenAndEmitDAG(BB);
   HadTailCall = SDB->HasTailCall;
   SDB->clear();
 }
@@ -473,7 +474,7 @@ void SelectionDAGISel::ComputeLiveOutVRegInfo() {
   } while (!Worklist.empty());
 }
 
-void SelectionDAGISel::CodeGenAndEmitDAG() {
+void SelectionDAGISel::CodeGenAndEmitDAG(MachineBasicBlock *BB) {
   std::string GroupName;
   if (TimePassesIsEnabled)
     GroupName = "Instruction Selection and Scheduling";
@@ -754,7 +755,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
   // Iterate over all basic blocks in the function.
   for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
     const BasicBlock *LLVMBB = &*I;
-    BB = FuncInfo->MBBMap[LLVMBB];
+    MachineBasicBlock *BB = FuncInfo->MBBMap[LLVMBB];
 
     BasicBlock::const_iterator const Begin = LLVMBB->begin();
     BasicBlock::const_iterator const End = LLVMBB->end();
@@ -790,7 +791,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
       // beginning FastISel on the entry block.
       if (LLVMBB == &Fn.getEntryBlock()) {
         CurDAG->setRoot(SDB->getControlRoot());
-        CodeGenAndEmitDAG();
+        CodeGenAndEmitDAG(BB);
         SDB->clear();
       }
       FastIS->startNewBlock(BB);
@@ -838,7 +839,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
           }
 
           bool HadTailCall = false;
-          SelectBasicBlock(LLVMBB, BI, llvm::next(BI), HadTailCall);
+          SelectBasicBlock(BB, LLVMBB, BI, llvm::next(BI), HadTailCall);
 
           // If the call was emitted as a tail call, we're done with the block.
           if (HadTailCall) {
@@ -874,17 +875,17 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
     // block.
     if (BI != End) {
       bool HadTailCall;
-      SelectBasicBlock(LLVMBB, BI, End, HadTailCall);
+      SelectBasicBlock(BB, LLVMBB, BI, End, HadTailCall);
     }
 
-    FinishBasicBlock();
+    FinishBasicBlock(BB);
   }
 
   delete FastIS;
 }
 
 void
-SelectionDAGISel::FinishBasicBlock() {
+SelectionDAGISel::FinishBasicBlock(MachineBasicBlock *BB) {
 
   DEBUG(dbgs() << "Target-post-processed machine code:\n");
   DEBUG(BB->dump());
@@ -923,7 +924,7 @@ SelectionDAGISel::FinishBasicBlock() {
       // Emit the code
       SDB->visitBitTestHeader(SDB->BitTestCases[i], BB);
       CurDAG->setRoot(SDB->getRoot());
-      CodeGenAndEmitDAG();
+      CodeGenAndEmitDAG(BB);
       SDB->clear();
     }
 
@@ -944,7 +945,7 @@ SelectionDAGISel::FinishBasicBlock() {
 
 
       CurDAG->setRoot(SDB->getRoot());
-      CodeGenAndEmitDAG();
+      CodeGenAndEmitDAG(BB);
       SDB->clear();
     }
 
@@ -991,7 +992,7 @@ SelectionDAGISel::FinishBasicBlock() {
       SDB->visitJumpTableHeader(SDB->JTCases[i].second, SDB->JTCases[i].first,
                                 BB);
       CurDAG->setRoot(SDB->getRoot());
-      CodeGenAndEmitDAG();
+      CodeGenAndEmitDAG(BB);
       SDB->clear();
     }
 
@@ -1000,7 +1001,7 @@ SelectionDAGISel::FinishBasicBlock() {
     // Emit the code
     SDB->visitJumpTable(SDB->JTCases[i].second);
     CurDAG->setRoot(SDB->getRoot());
-    CodeGenAndEmitDAG();
+    CodeGenAndEmitDAG(BB);
     SDB->clear();
 
     // Update PHI Nodes
@@ -1048,7 +1049,7 @@ SelectionDAGISel::FinishBasicBlock() {
     // Emit the code
     SDB->visitSwitchCase(SDB->SwitchCases[i], BB);
     CurDAG->setRoot(SDB->getRoot());
-    CodeGenAndEmitDAG();
+    CodeGenAndEmitDAG(BB);
 
     // Handle any PHI nodes in successors of this chunk, as if we were coming
     // from the original BB before switch expansion.  Note that PHI nodes can
-- 
2.34.1