// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include "toolchain/semantics/semantics_ir.h"

#include "common/check.h"
#include "llvm/Support/FormatVariadic.h"
#include "toolchain/lexer/tokenized_buffer.h"
#include "toolchain/semantics/semantics_builtin_kind.h"
#include "toolchain/semantics/semantics_node.h"
#include "toolchain/semantics/semantics_parse_tree_handler.h"

namespace Carbon {

auto SemanticsIR::MakeBuiltinIR() -> SemanticsIR {
  SemanticsIR semantics;
  static constexpr auto BuiltinIR = SemanticsCrossReferenceIRId(0);
  auto block_id = semantics.AddNodeBlock();
  semantics.cross_references_.resize_for_overwrite(
      SemanticsBuiltinKind::ValidCount);

  // TODO: The type-type should be replaced with a constraint. It will probably
  // remain a builtin, just reimplemented as equivalent to `constraint type {}`.
  auto builtin_type_type = semantics.AddNode(
      block_id, SemanticsNode::MakeBuiltin(SemanticsBuiltinKind::TypeType(),
                                           SemanticsNodeId(0)));
  semantics.cross_references_[SemanticsBuiltinKind::TypeType().AsInt()] =
      SemanticsCrossReference(BuiltinIR, block_id, builtin_type_type);
  CARBON_CHECK(builtin_type_type.id == 0)
      << "TypeType's type must be self-referential.";

  auto builtin_int32 = semantics.AddNode(
      block_id,
      SemanticsNode::MakeBuiltin(SemanticsBuiltinKind::IntegerLiteralType(),
                                 builtin_type_type));
  semantics
      .cross_references_[SemanticsBuiltinKind::IntegerLiteralType().AsInt()] =
      SemanticsCrossReference(BuiltinIR, block_id, builtin_int32);

  CARBON_CHECK(semantics.node_blocks_.size() == 1)
      << "BuildBuiltins should only produce 1 block, actual: "
      << semantics.node_blocks_.size();
  return semantics;
}

auto SemanticsIR::MakeFromParseTree(const SemanticsIR& builtin_ir,
                                    const TokenizedBuffer& tokens,
                                    const ParseTree& parse_tree)
    -> SemanticsIR {
  SemanticsIR semantics(builtin_ir);
  SemanticsParseTreeHandler(tokens, parse_tree, semantics).Build();
  return semantics;
}

auto SemanticsIR::Print(llvm::raw_ostream& out) const -> void {
  constexpr int Indent = 2;

  out << "cross_reference_irs.size == " << cross_reference_irs_.size() << ",\n";

  out << "cross_references = {\n";
  for (int32_t i = 0; i < static_cast<int32_t>(cross_references_.size()); ++i) {
    out.indent(Indent);
    out << SemanticsNodeId::MakeCrossReference(i) << " = \""
        << cross_references_[i] << "\";\n";
  }
  out << "},\n";

  out << "identifiers = {\n";
  for (int32_t i = 0; i < static_cast<int32_t>(identifiers_.size()); ++i) {
    out.indent(Indent);
    out << SemanticsIdentifierId(i) << " = \"" << identifiers_[i] << "\";\n";
  }
  out << "},\n";

  out << "integer_literals = {\n";
  for (int32_t i = 0; i < static_cast<int32_t>(integer_literals_.size()); ++i) {
    out.indent(Indent);
    out << SemanticsIntegerLiteralId(i) << " = " << integer_literals_[i]
        << ";\n";
  }
  out << "},\n";

  out << "node_blocks = {\n";
  for (int32_t i = 0; i < static_cast<int32_t>(node_blocks_.size()); ++i) {
    out.indent(Indent);
    out << SemanticsNodeBlockId(i) << " = {\n";

    const auto& node_block = node_blocks_[i];
    for (int32_t i = 0; i < static_cast<int32_t>(node_block.size()); ++i) {
      out.indent(2 * Indent);
      out << SemanticsNodeId(i) << " = " << node_block[i] << ";\n";
    }

    out.indent(Indent);
    out << "},\n";
  }
  out << "}\n";
}

}  // namespace Carbon