1 //===-- Printf Configuration Handler ----------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_SRC_STDIO_PRINTF_CORE_PRINTF_CONFIG_H 10 #define LLVM_LIBC_SRC_STDIO_PRINTF_CORE_PRINTF_CONFIG_H 11 12 // The index array buffer is always initialized when printf is called. In cases 13 // where index mode is necessary but memory is limited, or when index mode 14 // performance is important and memory is available, this compile option 15 // provides a knob to adjust memory usage to an appropriate level. 128 is picked 16 // as the default size since that's big enough to handle even extreme cases and 17 // the runtime penalty for not having enough space is severe. 18 // When an index mode argument is requested, if its index is before the most 19 // recently read index, then the arg list must be restarted from the beginning, 20 // and all of the arguments before the new index must be requested with the 21 // correct types. The index array caches the types of the values in the arg 22 // list. For every number between the last index cached in the array and the 23 // requested index, the format string must be parsed again to find the 24 // type of that index. As an example, if the format string has 20 indexes, and 25 // the index array is 10, then when the 20th index is requested the first 10 26 // types can be found immediately, and then the format string must be parsed 10 27 // times to find the types of the next 10 arguments. 28 #ifndef LIBC_COPT_PRINTF_INDEX_ARR_LEN 29 #define LIBC_COPT_PRINTF_INDEX_ARR_LEN 128 30 #endif 31 32 // If fixed point is available and the user hasn't explicitly opted out, then 33 // enable fixed point. 34 #if defined(LIBC_COMPILER_HAS_FIXED_POINT) && \ 35 !defined(LIBC_COPT_PRINTF_DISABLE_FIXED_POINT) 36 #define LIBC_INTERNAL_PRINTF_HAS_FIXED_POINT 37 #endif 38 39 // TODO(michaelrj): Provide a proper interface for these options. 40 // LIBC_COPT_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE 41 // LIBC_COPT_FLOAT_TO_STR_USE_DYADIC_FLOAT 42 // LIBC_COPT_FLOAT_TO_STR_USE_DYADIC_FLOAT_LD 43 // LIBC_COPT_FLOAT_TO_STR_USE_INT_CALC 44 // LIBC_COPT_FLOAT_TO_STR_NO_TABLE 45 // LIBC_COPT_PRINTF_HEX_LONG_DOUBLE 46 47 // TODO(michaelrj): Move the other printf configuration options into this file. 48 49 // LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS 50 51 #endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_PRINTF_CONFIG_H 52