Revert "[Orc] Directly emit machine code for the x86 resolver block and trampolines."

This reverts commit r251933.

It broke the build of examples/Kaleidoscope/Orc/fully_lazy/toy.cpp.

llvm-svn: 251937

4 files changed, 105 insertions, 83 deletions

diff --git a/llvm/include/llvm-c/OrcBindings.h b/llvm/include/llvm-c/OrcBindings.h
index f6aff916999..78a7bc146ee 100644
--- a/llvm/include/llvm-c/OrcBindings.h
+++ b/llvm/include/llvm-c/OrcBindings.h
@@ -47,7 +47,8 @@ typedef uint64_t (*LLVMOrcLazyCompileCallbackFn)(LLVMOrcJITStackRef JITStack,
  * client should not attempt to dispose of the Target Machine, or it will result
  * in a double-free.
  */
-LLVMOrcJITStackRef LLVMOrcCreateInstance(LLVMTargetMachineRef TM);
+LLVMOrcJITStackRef LLVMOrcCreateInstance(LLVMTargetMachineRef TM,
+                                         LLVMContextRef Context);
 
 /**
  * Mangle the given symbol.
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h b/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
index 8f4e844032c..9c37aa01681 100644
--- a/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/CompileOnDemandLayer.h
@@ -242,7 +242,7 @@ private:
         // Create a callback, associate it with the stub for the function,
         // and set the compile action to compile the partition containing the
         // function.
-        auto CCInfo = CompileCallbackMgr.getCompileCallback();
+        auto CCInfo = CompileCallbackMgr.getCompileCallback(SrcM.getContext());
         StubInits[mangle(F.getName(), DL)] =
           std::make_pair(CCInfo.getAddress(),
                          JITSymbolBase::flagsFromGlobalValue(F));
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/IndirectionUtils.h b/llvm/include/llvm/ExecutionEngine/Orc/IndirectionUtils.h
index cabc95543d8..5ed8935980f 100644
--- a/llvm/include/llvm/ExecutionEngine/Orc/IndirectionUtils.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/IndirectionUtils.h
@@ -27,7 +27,8 @@
 namespace llvm {
 namespace orc {
 
-/// @brief Target-independent base class JITCompileCallbackManager.
+/// @brief Base class for JITLayer independent aspects of
+///        JITCompileCallbackManager.
 class JITCompileCallbackManagerBase {
 public:
 
@@ -53,8 +54,13 @@ public:
   /// @brief Construct a JITCompileCallbackManagerBase.
   /// @param ErrorHandlerAddress The address of an error handler in the target
   ///                            process to be used if a compile callback fails.
-  JITCompileCallbackManagerBase(TargetAddress ErrorHandlerAddress)
-    : ErrorHandlerAddress(ErrorHandlerAddress) {}
+  /// @param NumTrampolinesPerBlock Number of trampolines to emit if there is no
+  ///                             available trampoline when getCompileCallback is
+  ///                             called.
+  JITCompileCallbackManagerBase(TargetAddress ErrorHandlerAddress,
+                                unsigned NumTrampolinesPerBlock)
+    : ErrorHandlerAddress(ErrorHandlerAddress),
+      NumTrampolinesPerBlock(NumTrampolinesPerBlock) {}
 
   virtual ~JITCompileCallbackManagerBase() {}
 
@@ -84,7 +90,7 @@ public:
   }
 
   /// @brief Reserve a compile callback.
-  virtual CompileCallbackInfo getCompileCallback() = 0;
+  virtual CompileCallbackInfo getCompileCallback(LLVMContext &Context) = 0;
 
   /// @brief Get a CompileCallbackInfo for an existing callback.
   CompileCallbackInfo getCompileCallbackInfo(TargetAddress TrampolineAddr) {
@@ -107,6 +113,7 @@ public:
 
 protected:
   TargetAddress ErrorHandlerAddress;
+  unsigned NumTrampolinesPerBlock;
 
   typedef std::map<TargetAddress, CompileFtor> TrampolineMapT;
   TrampolineMapT ActiveTrampolines;
@@ -117,54 +124,69 @@ private:
 };
 
 /// @brief Manage compile callbacks.
-template <typename TargetT>
+template <typename JITLayerT, typename TargetT>
 class JITCompileCallbackManager : public JITCompileCallbackManagerBase {
 public:
 
   /// @brief Construct a JITCompileCallbackManager.
+  /// @param JIT JIT layer to emit callback trampolines, etc. into.
+  /// @param Context LLVMContext to use for trampoline & resolve block modules.
   /// @param ErrorHandlerAddress The address of an error handler in the target
   ///                            process to be used if a compile callback fails.
-  JITCompileCallbackManager(TargetAddress ErrorHandlerAddress)
-    : JITCompileCallbackManagerBase(ErrorHandlerAddress) {
-
-    /// Set up the resolver block.
-    std::error_code EC;
-    ResolverBlock =
-      sys::OwningMemoryBlock(
-        sys::Memory::allocateMappedMemory(TargetT::ResolverCodeSize, nullptr,
-                                          sys::Memory::MF_READ |
-                                          sys::Memory::MF_WRITE, EC));
-    assert(!EC && "Failed to allocate resolver block");
-
-    TargetT::writeResolverCode(static_cast<uint8_t*>(ResolverBlock.base()),
-			       &reenter, this);
-
-    EC = sys::Memory::protectMappedMemory(ResolverBlock.getMemoryBlock(),
-					  sys::Memory::MF_READ |
-					  sys::Memory::MF_EXEC);
-    assert(!EC && "Failed to mprotect resolver block");
+  /// @param NumTrampolinesPerBlock Number of trampolines to allocate whenever
+  ///                               there is no existing callback trampoline.
+  ///                               (Trampolines are allocated in blocks for
+  ///                               efficiency.)
+  JITCompileCallbackManager(JITLayerT &JIT, RuntimeDyld::MemoryManager &MemMgr,
+                            LLVMContext &Context,
+                            TargetAddress ErrorHandlerAddress,
+                            unsigned NumTrampolinesPerBlock)
+    : JITCompileCallbackManagerBase(ErrorHandlerAddress,
+                                    NumTrampolinesPerBlock),
+      JIT(JIT), MemMgr(MemMgr) {
+    emitResolverBlock(Context);
   }
 
   /// @brief Get/create a compile callback with the given signature.
-  CompileCallbackInfo getCompileCallback() final {
-    TargetAddress TrampolineAddr = getAvailableTrampolineAddr();
+  CompileCallbackInfo getCompileCallback(LLVMContext &Context) final {
+    TargetAddress TrampolineAddr = getAvailableTrampolineAddr(Context);
     auto &Compile = this->ActiveTrampolines[TrampolineAddr];
     return CompileCallbackInfo(TrampolineAddr, Compile);
   }
 
 private:
 
-  static TargetAddress reenter(void *CCMgr, void *TrampolineId) {
-    JITCompileCallbackManager *Mgr =
-      static_cast<JITCompileCallbackManager*>(CCMgr);
-    return Mgr->executeCompileCallback(
-             static_cast<TargetAddress>(
-               reinterpret_cast<uintptr_t>(TrampolineId)));
+  std::vector<std::unique_ptr<Module>>
+  SingletonSet(std::unique_ptr<Module> M) {
+    std::vector<std::unique_ptr<Module>> Ms;
+    Ms.push_back(std::move(M));
+    return Ms;
+  }
+
+  void emitResolverBlock(LLVMContext &Context) {
+    std::unique_ptr<Module> M(new Module("resolver_block_module",
+                                         Context));
+    TargetT::insertResolverBlock(*M, *this);
+    auto NonResolver =
+      createLambdaResolver(
+          [](const std::string &Name) -> RuntimeDyld::SymbolInfo {
+            llvm_unreachable("External symbols in resolver block?");
+          },
+          [](const std::string &Name) -> RuntimeDyld::SymbolInfo {
+            llvm_unreachable("Dylib symbols in resolver block?");
+          });
+    auto H = JIT.addModuleSet(SingletonSet(std::move(M)), &MemMgr,
+                              std::move(NonResolver));
+    JIT.emitAndFinalize(H);
+    auto ResolverBlockSymbol =
+      JIT.findSymbolIn(H, TargetT::ResolverBlockName, false);
+    assert(ResolverBlockSymbol && "Failed to insert resolver block");
+    ResolverBlockAddr = ResolverBlockSymbol.getAddress();
   }
 
-  TargetAddress getAvailableTrampolineAddr() {
+  TargetAddress getAvailableTrampolineAddr(LLVMContext &Context) {
     if (this->AvailableTrampolines.empty())
-      grow();
+      grow(Context);
     assert(!this->AvailableTrampolines.empty() &&
            "Failed to grow available trampolines.");
     TargetAddress TrampolineAddr = this->AvailableTrampolines.back();
@@ -172,41 +194,35 @@ private:
     return TrampolineAddr;
   }
 
-  void grow() {
+  void grow(LLVMContext &Context) {
     assert(this->AvailableTrampolines.empty() && "Growing prematurely?");
-
-    std::error_code EC;
-    auto TrampolineBlock =
-      sys::OwningMemoryBlock(
-        sys::Memory::allocateMappedMemory(TargetT::PageSize, nullptr,
-                                          sys::Memory::MF_READ |
-                                          sys::Memory::MF_WRITE, EC));
-    assert(!EC && "Failed to allocate trampoline block");
-
-
-    unsigned NumTrampolines =
-      (TargetT::PageSize - TargetT::PointerSize) / TargetT::TrampolineSize;
-
-    uint8_t *TrampolineMem = static_cast<uint8_t*>(TrampolineBlock.base());
-    TargetT::writeTrampolines(TrampolineMem, ResolverBlock.base(),
-			      NumTrampolines);
-
-    for (unsigned I = 0; I < NumTrampolines; ++I)
-      this->AvailableTrampolines.push_back(
-        static_cast<TargetAddress>(
-	  reinterpret_cast<uintptr_t>(
-				      TrampolineMem + (I * TargetT::TrampolineSize))));
-
-    EC = sys::Memory::protectMappedMemory(TrampolineBlock.getMemoryBlock(),
-					  sys::Memory::MF_READ |
-					  sys::Memory::MF_EXEC);
-    assert(!EC && "Failed to mprotect trampoline block");
-    
-    TrampolineBlocks.push_back(std::move(TrampolineBlock));
+    std::unique_ptr<Module> M(new Module("trampoline_block", Context));
+    auto GetLabelName =
+      TargetT::insertCompileCallbackTrampolines(*M, ResolverBlockAddr,
+                                                this->NumTrampolinesPerBlock,
+                                                this->ActiveTrampolines.size());
+    auto NonResolver =
+      createLambdaResolver(
+          [](const std::string &Name) -> RuntimeDyld::SymbolInfo {
+            llvm_unreachable("External symbols in trampoline block?");
+          },
+          [](const std::string &Name) -> RuntimeDyld::SymbolInfo {
+            llvm_unreachable("Dylib symbols in trampoline block?");
+          });
+    auto H = JIT.addModuleSet(SingletonSet(std::move(M)), &MemMgr,
+                              std::move(NonResolver));
+    JIT.emitAndFinalize(H);
+    for (unsigned I = 0; I < this->NumTrampolinesPerBlock; ++I) {
+      std::string Name = GetLabelName(I);
+      auto TrampolineSymbol = JIT.findSymbolIn(H, Name, false);
+      assert(TrampolineSymbol && "Failed to emit trampoline.");
+      this->AvailableTrampolines.push_back(TrampolineSymbol.getAddress());
+    }
   }
 
-  sys::OwningMemoryBlock ResolverBlock;
-  std::vector<sys::OwningMemoryBlock> TrampolineBlocks;
+  JITLayerT &JIT;
+  RuntimeDyld::MemoryManager &MemMgr;
+  TargetAddress ResolverBlockAddr;
 };
 
 /// @brief Base class for managing collections of named indirect stubs.
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/OrcTargetSupport.h b/llvm/include/llvm/ExecutionEngine/Orc/OrcTargetSupport.h
index 3e57314ba2d..58273ae4616 100644
--- a/llvm/include/llvm/ExecutionEngine/Orc/OrcTargetSupport.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/OrcTargetSupport.h
@@ -26,24 +26,29 @@ namespace orc {
 
 class OrcX86_64 {
 public:
-  static const unsigned PageSize = 4096;
-  static const unsigned PointerSize = 8;
-  static const unsigned TrampolineSize = 8;
-  static const unsigned ResolverCodeSize = 0x78;
+  static const char *ResolverBlockName;
 
-  typedef TargetAddress (*JITReentryFn)(void *CallbackMgr,
-                                        void *TrampolineId);
+  /// @brief Insert module-level inline callback asm into module M for the
+  /// symbols managed by JITResolveCallbackHandler J.
+  static void insertResolverBlock(Module &M,
+                                  JITCompileCallbackManagerBase &JCBM);
 
-  /// @brief Write the resolver code into the given memory. The user is be
-  ///        responsible for allocating the memory and setting permissions.
-  static void writeResolverCode(uint8_t *ResolveMem, JITReentryFn Reentry,
-				void *CallbackMgr);
+  /// @brief Get a label name from the given index.
+  typedef std::function<std::string(unsigned)> LabelNameFtor;
 
-  /// @brief Write the requsted number of trampolines into the given memory,
-  ///        which must be big enough to hold 1 pointer, plus NumTrampolines
-  ///        trampolines.
-  static void writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
-			       unsigned NumTrampolines);
+  /// @brief Insert the requested number of trampolines into the given module.
+  /// @param M Module to insert the call block into.
+  /// @param NumCalls Number of calls to create in the call block.
+  /// @param StartIndex Optional argument specifying the index suffix to start
+  ///                   with.
+  /// @return A functor that provides the symbol name for each entry in the call
+  ///         block.
+  ///
+  static LabelNameFtor insertCompileCallbackTrampolines(
+                                                    Module &M,
+                                                    TargetAddress TrampolineAddr,
+                                                    unsigned NumCalls,
+                                                    unsigned StartIndex = 0);
 
   /// @brief Provide information about stub blocks generated by the
   ///        makeIndirectStubsBlock function.