[ORC] Add IRLayer and ObjectLayer interfaces and related MaterializationUnits.

llvm-svn: 332896

3 files changed, 210 insertions, 0 deletions

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/Layer.h b/llvm/include/llvm/ExecutionEngine/Orc/Layer.h
new file mode 100644
index 00000000000..5aef5a26d2a
--- /dev/null
+++ b/llvm/include/llvm/ExecutionEngine/Orc/Layer.h
@@ -0,0 +1,99 @@
+//===---------------- Layer.h -- Layer interfaces --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Layer interfaces.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORC_LAYER_H
+#define LLVM_EXECUTIONENGINE_ORC_LAYER_H
+
+#include "llvm/ExecutionEngine/Orc/Core.h"
+#include "llvm/IR/Module.h"
+
+namespace llvm {
+namespace orc {
+
+class MangleAndInterner {
+public:
+  MangleAndInterner(ExecutionSession &ES, const DataLayout &DL);
+  SymbolStringPtr operator()(StringRef Name);
+
+private:
+  ExecutionSession &ES;
+  const DataLayout &DL;
+};
+
+/// Layer interface.
+class IRLayer {
+public:
+  IRLayer(ExecutionSession &ES);
+  virtual ~IRLayer();
+
+  ExecutionSession &getExecutionSession() { return ES; }
+
+  virtual Error add(VSO &V, VModuleKey K, std::unique_ptr<Module> M);
+  virtual void emit(MaterializationResponsibility R, VModuleKey K,
+                    std::unique_ptr<Module> M) = 0;
+
+private:
+  ExecutionSession &ES;
+};
+
+class BasicIRLayerMaterializationUnit : public MaterializationUnit {
+public:
+  BasicIRLayerMaterializationUnit(IRLayer &L, VModuleKey K,
+                                  std::unique_ptr<Module> M);
+
+private:
+  void materialize(MaterializationResponsibility R) override;
+  void discard(const VSO &V, SymbolStringPtr Name) override;
+
+  IRLayer &L;
+  VModuleKey K;
+  std::unique_ptr<Module> M;
+  std::map<SymbolStringPtr, GlobalValue *> Discardable;
+};
+
+class ObjectLayer {
+public:
+  ObjectLayer(ExecutionSession &ES);
+  virtual ~ObjectLayer();
+
+  ExecutionSession &getExecutionSession() { return ES; }
+
+  virtual Error add(VSO &V, VModuleKey K, std::unique_ptr<MemoryBuffer> O);
+  virtual void emit(MaterializationResponsibility R, VModuleKey K,
+                    std::unique_ptr<MemoryBuffer> O) = 0;
+
+private:
+  ExecutionSession &ES;
+};
+
+/// The MemoryBuffer should represent a valid object file.
+/// If there is any chance that the file is invalid it should be validated
+/// prior to constructing a BasicObjectLayerMaterializationUnit.
+class BasicObjectLayerMaterializationUnit : public MaterializationUnit {
+public:
+  BasicObjectLayerMaterializationUnit(ObjectLayer &L, VModuleKey K,
+                                      std::unique_ptr<MemoryBuffer> O);
+
+private:
+  void materialize(MaterializationResponsibility R) override;
+  void discard(const VSO &V, SymbolStringPtr Name) override;
+
+  ObjectLayer &L;
+  VModuleKey K;
+  std::unique_ptr<MemoryBuffer> O;
+};
+
+} // End namespace orc
+} // End namespace llvm
+
+#endif // LLVM_EXECUTIONENGINE_ORC_LAYER_H
diff --git a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
index ca1b9ee005c..ec0d0e0796b 100644
--- a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
+++ b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
@@ -3,6 +3,7 @@ add_llvm_library(LLVMOrcJIT
   ExecutionUtils.cpp
   IndirectionUtils.cpp
   Legacy.cpp
+  Layer.cpp
   NullResolver.cpp
   OrcABISupport.cpp
   OrcCBindings.cpp
diff --git a/llvm/lib/ExecutionEngine/Orc/Layer.cpp b/llvm/lib/ExecutionEngine/Orc/Layer.cpp
new file mode 100644
index 00000000000..2bb7b907fed
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/Orc/Layer.cpp
@@ -0,0 +1,110 @@
+//===-------------------- Layer.cpp - Layer interfaces --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/Layer.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace llvm {
+namespace orc {
+
+MangleAndInterner::MangleAndInterner(ExecutionSession &ES, const DataLayout &DL)
+    : ES(ES), DL(DL) {}
+
+SymbolStringPtr MangleAndInterner::operator()(StringRef Name) {
+  std::string MangledName;
+  {
+    raw_string_ostream MangledNameStream(MangledName);
+    Mangler::getNameWithPrefix(MangledNameStream, Name, DL);
+  }
+  return ES.getSymbolStringPool().intern(MangledName);
+}
+
+IRLayer::IRLayer(ExecutionSession &ES) : ES(ES) {}
+IRLayer::~IRLayer() {}
+
+Error IRLayer::add(VSO &V, VModuleKey K, std::unique_ptr<Module> M) {
+  return V.define(llvm::make_unique<BasicIRLayerMaterializationUnit>(
+      *this, std::move(K), std::move(M)));
+}
+
+BasicIRLayerMaterializationUnit::BasicIRLayerMaterializationUnit(
+    IRLayer &L, VModuleKey K, std::unique_ptr<Module> M)
+    : MaterializationUnit(SymbolFlagsMap()), L(L), K(std::move(K)),
+      M(std::move(M)) {
+
+  auto &ES = L.getExecutionSession();
+  MangleAndInterner Mangle(ES, this->M->getDataLayout());
+  for (auto &G : this->M->global_values()) {
+    if (G.hasName() && !G.isDeclaration() &&
+        !G.hasLocalLinkage() &&
+        !G.hasAvailableExternallyLinkage()) {
+      auto MangledName = Mangle(G.getName());
+      SymbolFlags[MangledName] = JITSymbolFlags::fromGlobalValue(G);
+      Discardable[MangledName] = &G;
+    }
+  }
+}
+
+void BasicIRLayerMaterializationUnit::materialize(
+    MaterializationResponsibility R) {
+  L.emit(std::move(R), std::move(K), std::move(M));
+}
+
+void BasicIRLayerMaterializationUnit::discard(const VSO &V,
+                                              SymbolStringPtr Name) {
+  auto I = Discardable.find(Name);
+  assert(I != Discardable.end() &&
+         "Symbol not provided by this MU, or previously discarded");
+  I->second->setLinkage(GlobalValue::AvailableExternallyLinkage);
+  Discardable.erase(I);
+}
+
+ObjectLayer::ObjectLayer(ExecutionSession &ES) : ES(ES) {}
+
+ObjectLayer::~ObjectLayer() {}
+
+Error ObjectLayer::add(VSO &V, VModuleKey K, std::unique_ptr<MemoryBuffer> O) {
+  return V.define(llvm::make_unique<BasicObjectLayerMaterializationUnit>(
+      *this, std::move(K), std::move(O)));
+}
+
+BasicObjectLayerMaterializationUnit::BasicObjectLayerMaterializationUnit(
+    ObjectLayer &L, VModuleKey K, std::unique_ptr<MemoryBuffer> O)
+    : MaterializationUnit(SymbolFlagsMap()), L(L), K(std::move(K)),
+      O(std::move(O)) {
+
+  auto &ES = L.getExecutionSession();
+  auto Obj = cantFail(
+      object::ObjectFile::createObjectFile(this->O->getMemBufferRef()));
+
+  for (auto &Sym : Obj->symbols()) {
+    if (!(Sym.getFlags() & object::BasicSymbolRef::SF_Undefined) &&
+         (Sym.getFlags() & object::BasicSymbolRef::SF_Exported)) {
+      auto InternedName =
+          ES.getSymbolStringPool().intern(cantFail(Sym.getName()));
+      SymbolFlags[InternedName] = JITSymbolFlags::fromObjectSymbol(Sym);
+    }
+  }
+}
+
+void BasicObjectLayerMaterializationUnit::materialize(
+    MaterializationResponsibility R) {
+  L.emit(std::move(R), std::move(K), std::move(O));
+}
+
+void BasicObjectLayerMaterializationUnit::discard(const VSO &V,
+                                                  SymbolStringPtr Name) {
+  // FIXME: Support object file level discard. This could be done by building a
+  //        filter to pass to the object layer along with the object itself.
+}
+
+} // End namespace orc.
+} // End namespace llvm.