//===------------------ ItaniumDemangleTest.cpp ---------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "llvm/Demangle/ItaniumDemangle.h"
#include "llvm/Support/Allocator.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <cstdlib>
#include <string_view>
#include <vector>

using namespace llvm;
using namespace llvm::itanium_demangle;

namespace {
class TestAllocator {
  BumpPtrAllocator Alloc;

public:
  void reset() { Alloc.Reset(); }

  template <typename T, typename... Args> T *makeNode(Args &&... args) {
    return new (Alloc.Allocate(sizeof(T), alignof(T)))
        T(std::forward<Args>(args)...);
  }

  void *allocateNodeArray(size_t sz) {
    return Alloc.Allocate(sizeof(Node *) * sz, alignof(Node *));
  }
};
} // namespace

namespace NodeMatcher {
// Make sure the node matchers provide constructor parameters. This is a
// compilation test.
template <typename NT> struct Ctor {
  template <typename... Args> void operator()(Args &&...args) {
    auto _ = NT(std::forward<Args>(args)...);
  }
};

template <typename NT> void Visit(const NT *Node) { Node->match(Ctor<NT>{}); }
#define NOMATCHER(X)                                                           \
  template <> void Visit<itanium_demangle::X>(const itanium_demangle::X *) {}
// Some nodes have no match member.
NOMATCHER(ForwardTemplateReference)
#undef NOMATCHER

void Visitor() {
#define NODE(X) Visit(static_cast<const itanium_demangle::X *>(nullptr));
#include "llvm/Demangle/ItaniumNodes.def"
}
} // namespace NodeMatcher

// Verify Operator table is ordered
TEST(ItaniumDemangle, OperatorOrdering) {
  struct TestParser : AbstractManglingParser<TestParser, TestAllocator> {};
  for (const auto *Op = &TestParser::Ops[0];
       Op != &TestParser::Ops[TestParser::NumOps - 1]; Op++)
    ASSERT_LT(Op[0], Op[1]);
}

TEST(ItaniumDemangle, MethodOverride) {
  struct TestParser : AbstractManglingParser<TestParser, TestAllocator> {
    std::vector<char> Types;

    TestParser(const char *Str)
        : AbstractManglingParser(Str, Str + strlen(Str)) {}

    Node *parseType() {
      Types.push_back(*First);
      return AbstractManglingParser<TestParser, TestAllocator>::parseType();
    }
  };

  TestParser Parser("_Z1fIiEjl");
  ASSERT_NE(nullptr, Parser.parse());
  EXPECT_THAT(Parser.Types, testing::ElementsAre('i', 'j', 'l'));
}

static std::string toString(OutputBuffer &OB) {
  std::string_view SV = OB;
  return {SV.begin(), SV.end()};
}

TEST(ItaniumDemangle, HalfType) {
  struct TestParser : AbstractManglingParser<TestParser, TestAllocator> {
    std::vector<std::string> Types;

    TestParser(const char *Str)
        : AbstractManglingParser(Str, Str + strlen(Str)) {}

    Node *parseType() {
      OutputBuffer OB;
      Node *N = AbstractManglingParser<TestParser, TestAllocator>::parseType();
      N->printLeft(OB);
      std::string_view Name = N->getBaseName();
      if (!Name.empty())
        Types.push_back(std::string(Name.begin(), Name.end()));
      else
        Types.push_back(toString(OB));
      std::free(OB.getBuffer());
      return N;
    }
  };

  // void f(A<_Float16>, _Float16);
  TestParser Parser("_Z1f1AIDF16_EDF16_");
  ASSERT_NE(nullptr, Parser.parse());
  EXPECT_THAT(Parser.Types, testing::ElementsAre("_Float16", "A", "_Float16"));
}