cubff/forthtrivial.cu at main · davidalvin/cubff · GitHub

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// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <cstdint>
#define FORTH_CUSTOM_OPS

#include <array>

#include "forth.inc.h"
__device__ __host__ ForthOp Forth::GetOpKind(uint8_t c) {
  switch (c) {
    case 0x0:
      return ForthOp::kRead0;
    case 0x1:
      return ForthOp::kRead1;
    case 0x2:
      return ForthOp::kWrite0;
    case 0x3:
      return ForthOp::kWrite1;
    case 0x4:
      return ForthOp::kDup;
    case 0x5:
      return ForthOp::kDrop;
    case 0x6:
      return ForthOp::kSwap;
    case 0x7:
      return ForthOp::kIf0;
    case 0x8:
      return ForthOp::kInc;
    case 0x9:
      return ForthOp::kDec;
    case 0xA:
      return ForthOp::kAdd;
    case 0xB:
      return ForthOp::kSub;
    case 0xC:
      return ForthOp::kCopy0;
    case 0xD:
      return ForthOp::kCopy1;
    default:
      return (c >= 128 ? ForthOp::kJmp
                       : (c >= 64 ? ForthOp::kConst : ForthOp::kNoop));
  }
}

namespace {
const char *Forth::name() { return "forthtrivial"; }

void Forth::InitByteColors(
    std::array<std::array<uint8_t, 3>, 256> &byte_colors) {
  auto scale_color = [](std::array<uint8_t, 3> &color, size_t offset,
                        size_t num) {
    float darken_amount = offset * 0.2f / (num - 1);
    float multiplier = 1.0f - darken_amount;
    for (size_t c = 0; c < 3; c++) {
      color[c] =
          std::round(std::min(255.0f, std::max(0.0f, multiplier * color[c])));
    }
  };

  // I/O
  for (auto i : {0x00, 0x01, 0x02, 0x03, 0x0C, 0x0D}) {
    byte_colors[i] = {0x73, 0x01, 0xce};
  }
  // Stack manipulation
  for (auto i : {0x04, 0x05, 0x06, 0x08, 0x09, 0x0A, 0x0B}) {
    byte_colors[i] = {0x4e, 0x10, 0x01};
  }
  // Conditional jump
  byte_colors[0x07] = {0x00, 0x00, 0x00};
  // Forward jump
  for (size_t i = 0b10'000000; i < 0b11'000000; i++) {
    byte_colors[i] = {0x94, 0xd9, 0xff};
    scale_color(byte_colors[i], i - 0b10'000000, 0b1'000000);
  }
  // Backward jump
  for (size_t i = 0b11'000000; i < 0b100'000000; i++) {
    byte_colors[i] = {0xff, 0x77, 0x7d};
    scale_color(byte_colors[i], i - 0b11'000000, 0b1'000000);
  }
  // Constant
  for (size_t i = 0b01'000000; i < 0b10'000000; i++) {
    byte_colors[i] = {0xff, 0xff, 0xff};
    scale_color(byte_colors[i], i - 0b1'000000, 0b1'000000);
  }
  // Comment
  for (size_t i = 0x0E; i < 0x40; i++) {
    byte_colors[i] = {0x02, 0x8a, 0x37};
    scale_color(byte_colors[i], i - 0x0E, 50);
  }
}

}  // namespace