static const spv_ext_inst_group_t kGroups_1_0[] = {
    {SPV_EXT_INST_TYPE_GLSL_STD_450, ARRAY_SIZE(glsl_entries), glsl_entries},
    {SPV_EXT_INST_TYPE_OPENCL_STD, ARRAY_SIZE(opencl_entries), opencl_entries},
    {SPV_EXT_INST_TYPE_SPV_AMD_SHADER_EXPLICIT_VERTEX_PARAMETER,
     ARRAY_SIZE(spv_amd_shader_explicit_vertex_parameter_entries),
     spv_amd_shader_explicit_vertex_parameter_entries},
    {SPV_EXT_INST_TYPE_SPV_AMD_SHADER_TRINARY_MINMAX,
     ARRAY_SIZE(spv_amd_shader_trinary_minmax_entries),
     spv_amd_shader_trinary_minmax_entries},
    {SPV_EXT_INST_TYPE_SPV_AMD_GCN_SHADER,
     ARRAY_SIZE(spv_amd_gcn_shader_entries), spv_amd_gcn_shader_entries},
    {SPV_EXT_INST_TYPE_SPV_AMD_SHADER_BALLOT,
     ARRAY_SIZE(spv_amd_shader_ballot_entries), spv_amd_shader_ballot_entries},
    {SPV_EXT_INST_TYPE_DEBUGINFO, ARRAY_SIZE(debuginfo_entries),
     debuginfo_entries},
};

static const spv_ext_inst_table_t kTable_1_0 = {ARRAY_SIZE(kGroups_1_0),
                                                kGroups_1_0};

spv_result_t spvExtInstTableGet(spv_ext_inst_table* pExtInstTable,
                                spv_target_env env) {
  if (!pExtInstTable) return SPV_ERROR_INVALID_POINTER;

  switch (env) {
    // The extended instruction sets are all version 1.0 so far.
    case SPV_ENV_UNIVERSAL_1_0:
    case SPV_ENV_VULKAN_1_0:
    case SPV_ENV_UNIVERSAL_1_1:
    case SPV_ENV_UNIVERSAL_1_2:
    case SPV_ENV_OPENCL_1_2:
    case SPV_ENV_OPENCL_EMBEDDED_1_2:
    case SPV_ENV_OPENCL_2_0:
    case SPV_ENV_OPENCL_EMBEDDED_2_0:
    case SPV_ENV_OPENCL_2_1:
    case SPV_ENV_OPENCL_EMBEDDED_2_1:
    case SPV_ENV_OPENCL_2_2:
    case SPV_ENV_OPENCL_EMBEDDED_2_2:
    case SPV_ENV_OPENGL_4_0:
    case SPV_ENV_OPENGL_4_1:
    case SPV_ENV_OPENGL_4_2:
    case SPV_ENV_OPENGL_4_3:
    case SPV_ENV_OPENGL_4_5:
    case SPV_ENV_UNIVERSAL_1_3:
    case SPV_ENV_VULKAN_1_1:
    case SPV_ENV_VULKAN_1_1_SPIRV_1_4:
    case SPV_ENV_WEBGPU_0:
    case SPV_ENV_UNIVERSAL_1_4:
      *pExtInstTable = &kTable_1_0;
      return SPV_SUCCESS;
    default:
      return SPV_ERROR_INVALID_TABLE;
  }
}

spv_ext_inst_type_t spvExtInstImportTypeGet(const char* name) {
  // The names are specified by the respective extension instruction
  // specifications.
  if (!strcmp("GLSL.std.450", name)) {
    return SPV_EXT_INST_TYPE_GLSL_STD_450;
  }
  if (!strcmp("OpenCL.std", name)) {
    return SPV_EXT_INST_TYPE_OPENCL_STD;
  }
  if (!strcmp("SPV_AMD_shader_explicit_vertex_parameter", name)) {
    return SPV_EXT_INST_TYPE_SPV_AMD_SHADER_EXPLICIT_VERTEX_PARAMETER;
  }
  if (!strcmp("SPV_AMD_shader_trinary_minmax", name)) {
    return SPV_EXT_INST_TYPE_SPV_AMD_SHADER_TRINARY_MINMAX;
  }
  if (!strcmp("SPV_AMD_gcn_shader", name)) {
    return SPV_EXT_INST_TYPE_SPV_AMD_GCN_SHADER;
  }
  if (!strcmp("SPV_AMD_shader_ballot", name)) {
    return SPV_EXT_INST_TYPE_SPV_AMD_SHADER_BALLOT;
  }
  if (!strcmp("DebugInfo", name)) {
    return SPV_EXT_INST_TYPE_DEBUGINFO;
  }
  return SPV_EXT_INST_TYPE_NONE;
}

spv_result_t spvExtInstTableNameLookup(const spv_ext_inst_table table,
                                       const spv_ext_inst_type_t type,
                                       const char* name,
                                       spv_ext_inst_desc* pEntry) {
  if (!table) return SPV_ERROR_INVALID_TABLE;
  if (!pEntry) return SPV_ERROR_INVALID_POINTER;

  for (uint32_t groupIndex = 0; groupIndex < table->count; groupIndex++) {
    const auto& group = table->groups[groupIndex];
    if (type != group.type) continue;
    for (uint32_t index = 0; index < group.count; index++) {
      const auto& entry = group.entries[index];
      if (!strcmp(name, entry.name)) {
        *pEntry = &entry;
        return SPV_SUCCESS;
      }
    }
  }

  return SPV_ERROR_INVALID_LOOKUP;
}

spv_result_t spvExtInstTableValueLookup(const spv_ext_inst_table table,
                                        const spv_ext_inst_type_t type,
                                        const uint32_t value,
                                        spv_ext_inst_desc* pEntry) {
  if (!table) return SPV_ERROR_INVALID_TABLE;
  if (!pEntry) return SPV_ERROR_INVALID_POINTER;

  for (uint32_t groupIndex = 0; groupIndex < table->count; groupIndex++) {
    const auto& group = table->groups[groupIndex];
    if (type != group.type) continue;
    for (uint32_t index = 0; index < group.count; index++) {
      const auto& entry = group.entries[index];
      if (value == entry.ext_inst) {
        *pEntry = &entry;
        return SPV_SUCCESS;
      }
    }
  }

  return SPV_ERROR_INVALID_LOOKUP;
}
