1 files changed, 129 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Target/BPF/BPFTargetMachine.cpp b/contrib/llvm-project/llvm/lib/Target/BPF/BPFTargetMachine.cpp
new file mode 100644
index 000000000000..24c0ff0f7f15
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Target/BPF/BPFTargetMachine.cpp
@@ -0,0 +1,129 @@
+//===-- BPFTargetMachine.cpp - Define TargetMachine for BPF ---------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the info about BPF target spec.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BPFTargetMachine.h"
+#include "BPF.h"
+#include "MCTargetDesc/BPFMCAsmInfo.h"
+#include "TargetInfo/BPFTargetInfo.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;
+
+static cl::
+opt<bool> DisableMIPeephole("disable-bpf-peephole", cl::Hidden,
+                            cl::desc("Disable machine peepholes for BPF"));
+
+extern "C" void LLVMInitializeBPFTarget() {
+  // Register the target.
+  RegisterTargetMachine<BPFTargetMachine> X(getTheBPFleTarget());
+  RegisterTargetMachine<BPFTargetMachine> Y(getTheBPFbeTarget());
+  RegisterTargetMachine<BPFTargetMachine> Z(getTheBPFTarget());
+
+  PassRegistry &PR = *PassRegistry::getPassRegistry();
+  initializeBPFAbstractMemberAccessPass(PR);
+  initializeBPFMIPeepholePass(PR);
+}
+
+// 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;
+}
+
+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, CodeModel::Small), OL),
+      TLOF(make_unique<TargetLoweringObjectFileELF>()),
+      Subtarget(TT, CPU, FS, *this) {
+  initAsmInfo();
+
+  BPFMCAsmInfo *MAI =
+      static_cast<BPFMCAsmInfo *>(const_cast<MCAsmInfo *>(AsmInfo.get()));
+  MAI->setDwarfUsesRelocationsAcrossSections(!Subtarget.getUseDwarfRIS());
+}
+
+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>();
+  }
+
+  void addIRPasses() override;
+  bool addInstSelector() override;
+  void addMachineSSAOptimization() override;
+  void addPreEmitPass() override;
+};
+}
+
+TargetPassConfig *BPFTargetMachine::createPassConfig(PassManagerBase &PM) {
+  return new BPFPassConfig(*this, PM);
+}
+
+void BPFPassConfig::addIRPasses() {
+
+  addPass(createBPFAbstractMemberAccess());
+
+  TargetPassConfig::addIRPasses();
+}
+
+// Install an instruction selector pass using
+// the ISelDag to gen BPF code.
+bool BPFPassConfig::addInstSelector() {
+  addPass(createBPFISelDag(getBPFTargetMachine()));
+
+  return false;
+}
+
+void BPFPassConfig::addMachineSSAOptimization() {
+  addPass(createBPFMISimplifyPatchablePass());
+
+  // The default implementation must be called first as we want eBPF
+  // Peephole ran at last.
+  TargetPassConfig::addMachineSSAOptimization();
+
+  const BPFSubtarget *Subtarget = getBPFTargetMachine().getSubtargetImpl();
+  if (Subtarget->getHasAlu32() && !DisableMIPeephole)
+    addPass(createBPFMIPeepholePass());
+}
+
+void BPFPassConfig::addPreEmitPass() {
+  const BPFSubtarget *Subtarget = getBPFTargetMachine().getSubtargetImpl();
+
+  addPass(createBPFMIPreEmitCheckingPass());
+  if (getOptLevel() != CodeGenOpt::None)
+    if (Subtarget->getHasAlu32() && !DisableMIPeephole)
+      addPass(createBPFMIPreEmitPeepholePass());
+}