124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
#ifndef COSMOPOLITAN_LIBC_DCE_H_
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#define COSMOPOLITAN_LIBC_DCE_H_
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#include "libc/nexgen32e/kcpuids.h"
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/*─────────────────────────────────────────────────────────────────────────────╗
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│ cosmopolitan § autotune » dead code elimination │
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╚─────────────────────────────────────────────────────────────────────────────*/
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/**
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* Supported Platforms Tuning Knob (Runtime & Compile-Time)
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*
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* Cosmopolitan's design allows us to support eight platforms. We enable
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* them all by default, since we're able to do eight so efficiently. We
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* can't do more, due to the way the 80x86 instruction set is encoded.
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*
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* The user may optionally tune this bitmask, which effectively asks the
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* compiler to leave out system call polyfills for a platform, which may
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* offer marginal improvements in terms of code size and performance, at
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* the cost of portability.
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*/
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#define HOSTOS (hostos & SUPPORT_VECTOR)
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#ifndef SUPPORT_VECTOR
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#define SUPPORT_VECTOR 0b11111111
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#endif
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#define LINUX 1
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#define METAL 2
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#define WINDOWS 4
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#define XNU 8
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#define OPENBSD 16 /* 2019-12-11: new openbsd drm might thwart syscall */
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#define FREEBSD 32
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/* #define YOUR_CLOUD_PLATFORM_HERE 64 /\* jtunney@gmail.com *\/ */
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/* #define YOUR_CLOUD_PLATFORM_HERE 128 /\* jtunney@gmail.com *\/ */
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#ifdef NDEBUG
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#define NoDebug() 1
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#else
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#define NoDebug() 0
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#endif
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#ifdef MODE_DBG
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#define IsModeDbg() 1
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#else
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#define IsModeDbg() 0
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#endif
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#ifdef __MFENTRY__
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#define HaveFentry() 1
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#else
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#define HaveFentry() 0
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#endif
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#ifdef TRUSTWORTHY
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#define IsTrustworthy() 1
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#else
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#define IsTrustworthy() 0
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#endif
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#ifdef SECURITY_BLANKETS
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#define UseSecurityBlankets() 1
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#else
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#define UseSecurityBlankets() 0
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#endif
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#ifdef __MGENERAL_REGS_ONLY__
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#define UseGeneralRegsOnly() 1
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#else
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#define UseGeneralRegsOnly() 0
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#endif
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#ifdef TINY
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#define IsTiny() 1
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#else
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#define IsTiny() 0
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#endif
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#ifdef __OPTIMIZE__
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#define IsOptimized() 1
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#else
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#define IsOptimized() 0
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#endif
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#if defined(__PIE__) || defined(__PIC__)
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#define IsPositionIndependent() 1
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#else
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#define IsPositionIndependent() 0
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#endif
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#define SupportsLinux() ((SUPPORT_VECTOR & LINUX) == LINUX)
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#define SupportsMetal() ((SUPPORT_VECTOR & METAL) == METAL)
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#define SupportsWindows() ((SUPPORT_VECTOR & WINDOWS) == WINDOWS)
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#define SupportsXnu() ((SUPPORT_VECTOR & XNU) == XNU)
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#define SupportsFreebsd() ((SUPPORT_VECTOR & FREEBSD) == FREEBSD)
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#define SupportsOpenbsd() ((SUPPORT_VECTOR & OPENBSD) == OPENBSD)
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#define SupportsSystemv() \
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((SUPPORT_VECTOR & (LINUX | METAL | XNU | OPENBSD | FREEBSD)) != 0)
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#ifndef __ASSEMBLER__
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#define IsLinux() ((HOSTOS & LINUX) == LINUX)
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#define IsMetal() ((HOSTOS & METAL) == METAL)
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#define IsWindows() ((HOSTOS & WINDOWS) == WINDOWS)
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#define IsBsd() ((HOSTOS & (XNU | FREEBSD | OPENBSD)) != 0)
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#define IsXnu() ((HOSTOS & XNU) == XNU)
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#define IsFreebsd() ((HOSTOS & FREEBSD) == FREEBSD)
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#define IsOpenbsd() ((HOSTOS & OPENBSD) == OPENBSD)
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#else
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/* clang-format off */
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#define IsLinux() $LINUX,hostos(%rip)
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#define IsMetal() $METAL,hostos(%rip)
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#define IsWindows() $WINDOWS,hostos(%rip)
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#define IsBsd() $XNU|FREEBSD|OPENBSD,hostos(%rip)
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#define IsXnu() $XNU,hostos(%rip)
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#define IsFreebsd() $FREEBSD,hostos(%rip)
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#define IsOpenbsd() $OPENBSD,hostos(%rip)
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/* clang-format on */
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#endif
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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extern const int hostos;
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_DCE_H_ */
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