mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
e75ffde09e
You can now build Cosmopolitan with Clang:
make -j8 MODE=llvm
o/llvm/examples/hello.com
The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_FMT_PFLINK_H_
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#define COSMOPOLITAN_LIBC_FMT_PFLINK_H_
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#include "libc/dce.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/unicode/unicode.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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#ifndef __STRICT_ANSI__
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/**
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* @fileoverview builtin+preprocessor+linker tricks for printf/scanf.
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*
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* Your printf() function only requires that you pay for what you use.
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* These macros ensure that its code size starts at under 4kb, growing
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* to about 40kb for a fully-loaded implementation. This works best when
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* format strings are constexprs that only contain directives.
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*/
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#define PFLINK(FMT) \
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({ \
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if (___PFLINK(FMT, strpbrk, "cmrqs")) { \
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if (___PFLINK(FMT, strchr, '#')) STATIC_YOINK("kCp437"); \
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if (___PFLINK(FMT, strstr, "%m")) STATIC_YOINK("strerror"); \
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if (!IsTiny() && (___PFLINK(FMT, strstr, "%*") || \
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___PFLINK(FMT, strpbrk, "0123456789"))) { \
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STATIC_YOINK("strnwidth"); \
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STATIC_YOINK("strnwidth16"); \
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STATIC_YOINK("wcsnwidth"); \
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} \
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} \
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FMT; \
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})
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#define SFLINK(FMT) \
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({ \
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if (___PFLINK(FMT, strchr, 'm')) { \
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STATIC_YOINK("malloc"); \
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STATIC_YOINK("calloc"); \
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STATIC_YOINK("free"); \
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STATIC_YOINK("__grow"); \
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} \
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FMT; \
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})
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#if __GNUC__ + 0 < 4 || defined(__llvm__)
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#define ___PFLINK(FMT, FN, C) 1
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#else
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#define ___PFLINK(FMT, FN, C) \
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!__builtin_constant_p(FMT) || ((FMT) && __builtin_##FN(FMT, C) != NULL)
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#endif
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#if defined(__GNUC__) && __GNUC__ < 6
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/*
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* Compilers don't understand the features we've added to the format
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* string DSL, such as c string escaping, therefore we can't use it.
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* Ideally compilers should grant us more flexibility to define DSLs
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*
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* The recommended approach to turning this back on is `CFLAGS=-std=c11`
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* which puts the compiler in __STRICT_ANSI__ mode, which Cosmopolitan
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* respects by disabling all the esoteric tuning in headers like this.
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*/
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#pragma GCC diagnostic ignored "-Wformat-security"
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#endif /* __GNUC__ + 0 < 6 */
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#else
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#define PFLINK(FMT) FMT
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#define SFLINK(FMT) FMT
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#ifdef __GNUC__
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__asm__(".section .yoink\n\t"
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"nopl\tkCp437(%rip)\n\t"
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"nopl\tstrerror(%rip)\n\t"
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"nopl\tstrnwidth(%rip)\n\t"
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"nopl\tstrnwidth16(%rip)\n\t"
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"nopl\twcsnwidth(%rip)\n\t"
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"nopl\tmalloc(%rip)\n\t"
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"nopl\tcalloc(%rip)\n\t"
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"nopl\t__grow(%rip)\n\t"
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".previous");
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#else
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static long __pflink(long x) {
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x |= kCp437[0];
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x |= strnwidth(0, 0, 0);
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x |= strnwidth16(0, 0, 0);
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x |= wcsnwidth(0, 0, 0);
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x |= malloc(0);
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x |= __grow(0, 0, 0, 0);
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x |= (intptr_t)strerror(0);
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x |= (intptr_t)calloc(0, 0);
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return x;
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}
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#endif
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#endif /* __STRICT_ANSI__ */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_FMT_PFLINK_H_ */
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