//===--- IRPrintingPasses.cpp - Module and Function printing passes -------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// PrintModulePass and PrintFunctionPass implementations.
//
//===----------------------------------------------------------------------===//

#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

PrintModulePass::PrintModulePass() : OS(dbgs()) {}
PrintModulePass::PrintModulePass(raw_ostream &OS, const std::string &Banner,
                                 bool ShouldPreserveUseListOrder)
    : OS(OS), Banner(Banner),
      ShouldPreserveUseListOrder(ShouldPreserveUseListOrder) {}

PreservedAnalyses PrintModulePass::run(Module &M, ModuleAnalysisManager &) {
  if (llvm::isFunctionInPrintList("*")) {
    if (!Banner.empty())
      OS << Banner << "\n";
    M.print(OS, nullptr, ShouldPreserveUseListOrder);
  }
  else {
    bool BannerPrinted = false;
    for(const auto &F : M.functions()) {
      if (llvm::isFunctionInPrintList(F.getName())) {
        if (!BannerPrinted && !Banner.empty()) {
          OS << Banner << "\n";
          BannerPrinted = true;
        }
        F.print(OS);
      }
    }
  }
  return PreservedAnalyses::all();
}

PrintFunctionPass::PrintFunctionPass() : OS(dbgs()) {}
PrintFunctionPass::PrintFunctionPass(raw_ostream &OS, const std::string &Banner)
    : OS(OS), Banner(Banner) {}

PreservedAnalyses PrintFunctionPass::run(Function &F,
                                         FunctionAnalysisManager &) {
  if (isFunctionInPrintList(F.getName())) {
    if (forcePrintModuleIR())
      OS << Banner << " (function: " << F.getName() << ")\n" << *F.getParent();
    else
      OS << Banner << '\n' << static_cast<Value &>(F);
  }
  return PreservedAnalyses::all();
}

namespace {

class PrintModulePassWrapper : public ModulePass {
  PrintModulePass P;

public:
  static char ID;
  PrintModulePassWrapper() : ModulePass(ID) {}
  PrintModulePassWrapper(raw_ostream &OS, const std::string &Banner,
                         bool ShouldPreserveUseListOrder)
      : ModulePass(ID), P(OS, Banner, ShouldPreserveUseListOrder) {}

  bool runOnModule(Module &M) override {
    ModuleAnalysisManager DummyMAM;
    P.run(M, DummyMAM);
    return false;
  }

  void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.setPreservesAll();
  }

  StringRef getPassName() const override { return "Print Module IR"; }
};

class PrintFunctionPassWrapper : public FunctionPass {
  PrintFunctionPass P;

public:
  static char ID;
  PrintFunctionPassWrapper() : FunctionPass(ID) {}
  PrintFunctionPassWrapper(raw_ostream &OS, const std::string &Banner)
      : FunctionPass(ID), P(OS, Banner) {}

  // This pass just prints a banner followed by the function as it's processed.
  bool runOnFunction(Function &F) override {
    FunctionAnalysisManager DummyFAM;
    P.run(F, DummyFAM);
    return false;
  }

  void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.setPreservesAll();
  }

  StringRef getPassName() const override { return "Print Function IR"; }
};

}

char PrintModulePassWrapper::ID = 0;
INITIALIZE_PASS(PrintModulePassWrapper, "print-module",
                "Print module to stderr", false, true)
char PrintFunctionPassWrapper::ID = 0;
INITIALIZE_PASS(PrintFunctionPassWrapper, "print-function",
                "Print function to stderr", false, true)

ModulePass *llvm::createPrintModulePass(llvm::raw_ostream &OS,
                                        const std::string &Banner,
                                        bool ShouldPreserveUseListOrder) {
  return new PrintModulePassWrapper(OS, Banner, ShouldPreserveUseListOrder);
}

FunctionPass *llvm::createPrintFunctionPass(llvm::raw_ostream &OS,
                                            const std::string &Banner) {
  return new PrintFunctionPassWrapper(OS, Banner);
}

bool llvm::isIRPrintingPass(Pass *P) {
  const char *PID = (const char*)P->getPassID();

  return (PID == &PrintModulePassWrapper::ID) ||
         (PID == &PrintFunctionPassWrapper::ID);
}