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