Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/lib/Target/BPF/BPFTargetMachine.cpp

@@ -0,0 +1,90 @@
+//===-- BPFTargetMachine.cpp - Define TargetMachine for BPF ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the info about BPF target spec.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPFTargetMachine.h"
+#include "BPF.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Target/TargetOptions.h"
+using namespace llvm;
+
+extern "C" void LLVMInitializeBPFTarget() {
+  // Register the target.
+  RegisterTargetMachine<BPFTargetMachine> X(getTheBPFleTarget());
+  RegisterTargetMachine<BPFTargetMachine> Y(getTheBPFbeTarget());
+  RegisterTargetMachine<BPFTargetMachine> Z(getTheBPFTarget());
+}
+
+// DataLayout: little or big endian
+static std::string computeDataLayout(const Triple &TT) {
+  if (TT.getArch() == Triple::bpfeb)
+    return "E-m:e-p:64:64-i64:64-n32:64-S128";
+  else
+    return "e-m:e-p:64:64-i64:64-n32:64-S128";
+}
+
+static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
+  if (!RM.hasValue())
+    return Reloc::PIC_;
+  return *RM;
+}
+
+static CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM) {
+  if (CM)
+    return *CM;
+  return CodeModel::Small;
+}
+
+BPFTargetMachine::BPFTargetMachine(const Target &T, const Triple &TT,
+                                   StringRef CPU, StringRef FS,
+                                   const TargetOptions &Options,
+                                   Optional<Reloc::Model> RM,
+                                   Optional<CodeModel::Model> CM,
+                                   CodeGenOpt::Level OL, bool JIT)
+    : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
+                        getEffectiveRelocModel(RM), getEffectiveCodeModel(CM),
+                        OL),
+      TLOF(make_unique<TargetLoweringObjectFileELF>()),
+      Subtarget(TT, CPU, FS, *this) {
+  initAsmInfo();
+}
+namespace {
+// BPF Code Generator Pass Configuration Options.
+class BPFPassConfig : public TargetPassConfig {
+public:
+  BPFPassConfig(BPFTargetMachine &TM, PassManagerBase &PM)
+      : TargetPassConfig(TM, PM) {}
+
+  BPFTargetMachine &getBPFTargetMachine() const {
+    return getTM<BPFTargetMachine>();
+  }
+
+  bool addInstSelector() override;
+};
+}
+
+TargetPassConfig *BPFTargetMachine::createPassConfig(PassManagerBase &PM) {
+  return new BPFPassConfig(*this, PM);
+}
+
+// Install an instruction selector pass using
+// the ISelDag to gen BPF code.
+bool BPFPassConfig::addInstSelector() {
+  addPass(createBPFISelDag(getBPFTargetMachine()));
+
+  return false;
+}