Temporarily Revert "Nuke the old JIT." as it's not quite ready to

be deleted. This will be reapplied as soon as possible and before
the 3.6 branch date at any rate.

Approved by Jim Grosbach, Lang Hames, Rafael Espindola.

This reverts commits r215111, 215115, 215116, 215117, 215136.

llvm-svn: 215154

6 files changed, 42 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp b/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp
index 43a6e0f26dc..24bc570f44a 100644
--- a/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp
+++ b/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp
@@ -188,8 +188,9 @@ unsigned BasicTTI::getJumpBufSize() const {
 
 bool BasicTTI::shouldBuildLookupTables() const {
   const TargetLoweringBase *TLI = getTLI();
-  return TLI->isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) ||
-         TLI->isOperationLegalOrCustom(ISD::BRIND, MVT::Other);
+  return TLI->supportJumpTables() &&
+      (TLI->isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) ||
+       TLI->isOperationLegalOrCustom(ISD::BRIND, MVT::Other));
 }
 
 bool BasicTTI::haveFastSqrt(Type *Ty) const {
diff --git a/llvm/lib/CodeGen/CMakeLists.txt b/llvm/lib/CodeGen/CMakeLists.txt
index acc8a26936a..2a247c12e64 100644
--- a/llvm/lib/CodeGen/CMakeLists.txt
+++ b/llvm/lib/CodeGen/CMakeLists.txt
@@ -27,6 +27,7 @@ add_llvm_library(LLVMCodeGen
   InlineSpiller.cpp
   InterferenceCache.cpp
   IntrinsicLowering.cpp
+  JITCodeEmitter.cpp
   JumpInstrTables.cpp
   LLVMTargetMachine.cpp
   LatencyPriorityQueue.cpp
diff --git a/llvm/lib/CodeGen/JITCodeEmitter.cpp b/llvm/lib/CodeGen/JITCodeEmitter.cpp
new file mode 100644
index 00000000000..96a53892f6d
--- /dev/null
+++ b/llvm/lib/CodeGen/JITCodeEmitter.cpp
@@ -0,0 +1,14 @@
+//===-- llvm/CodeGen/JITCodeEmitter.cpp - Code emission --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/JITCodeEmitter.h"
+
+using namespace llvm;
+
+void JITCodeEmitter::anchor() { }
diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
index 2c77eabb0af..0e0d7ba4c89 100644
--- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -226,6 +226,26 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
   return false;
 }
 
+/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
+/// get machine code emitted.  This uses a JITCodeEmitter object to handle
+/// actually outputting the machine code and resolving things like the address
+/// of functions.  This method should return true if machine code emission is
+/// not supported.
+///
+bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
+                                                   JITCodeEmitter &JCE,
+                                                   bool DisableVerify) {
+  // Add common CodeGen passes.
+  MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify, nullptr,
+                                               nullptr);
+  if (!Context)
+    return true;
+
+  addCodeEmitter(PM, JCE);
+
+  return false; // success!
+}
+
 /// addPassesToEmitMC - Add passes to the specified pass manager to get
 /// machine code emitted with the MCJIT. This method returns true if machine
 /// code is not supported. It fills the MCContext Ctx pointer which can be
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 1fa5bf1114e..cc6eac70ba7 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -2228,8 +2228,9 @@ bool SelectionDAGBuilder::handleSmallSwitchRange(CaseRec& CR,
 }
 
 static inline bool areJTsAllowed(const TargetLowering &TLI) {
-  return TLI.isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) ||
-         TLI.isOperationLegalOrCustom(ISD::BRIND, MVT::Other);
+  return TLI.supportJumpTables() &&
+          (TLI.isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) ||
+           TLI.isOperationLegalOrCustom(ISD::BRIND, MVT::Other));
 }
 
 static APInt ComputeRange(const APInt &First, const APInt &Last) {
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 1a90c6c866f..a8c7a28a4e8 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -719,6 +719,7 @@ TargetLoweringBase::TargetLoweringBase(const TargetMachine &tm,
   PrefLoopAlignment = 0;
   MinStackArgumentAlignment = 1;
   InsertFencesForAtomic = false;
+  SupportJumpTables = true;
   MinimumJumpTableEntries = 4;
 
   InitLibcallNames(LibcallRoutineNames, Triple(TM.getTargetTriple()));