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/* This D file is implicitly imported by all ImportC source files.
* It provides definitions for C compiler builtin functions and declarations.
* The purpose is to make it unnecessary to hardwire them into the compiler.
* As the leading double underscore suggests, this is for internal use only.
*
* Copyright: Copyright Digital Mars 2022
* License: $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
* Authors: Walter Bright
* Source: $(DRUNTIMESRC __builtins.d)
*/
module __builtins;
/* gcc relies on internal __builtin_xxxx functions and templates to
* accomplish <stdarg.h>. D does the same thing with templates in core.stdc.stdarg.
* Here, we redirect the gcc builtin declarations to the equivalent
* ones in core.stdc.stdarg, thereby avoiding having to hardwire them
* into the D compiler.
*/
alias va_list = imported!"core.stdc.stdarg".va_list;
version (Posix)
{
version (X86_64)
alias __va_list_tag = imported!"core.stdc.stdarg".__va_list_tag;
}
alias __builtin_va_start = imported!"core.stdc.stdarg".va_start;
alias __builtin_va_end = imported!"core.stdc.stdarg".va_end;
alias __builtin_va_copy = imported!"core.stdc.stdarg".va_copy;
/* dmd's ImportC rewrites __builtin_va_arg into an instantiation of va_arg
*/
alias va_arg = imported!"core.stdc.stdarg".va_arg;
version (CRuntime_Microsoft)
{
//https://docs.microsoft.com/en-us/cpp/cpp/int8-int16-int32-int64?view=msvc-170
alias __int8 = byte;
alias __int16 = short;
alias __int32 = int;
alias __int64 = long;
}
/*********** floating point *************/
/* https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
*/
version (DigitalMars)
{
double __builtin_inf()() { return double.infinity; }
float __builtin_inff()() { return float.infinity; }
real __builtin_infl()() { return real.infinity; }
alias __builtin_huge_val = __builtin_inf;
alias __builtin_huge_valf = __builtin_inff;
alias __builtin_huge_vall = __builtin_infl;
alias __builtin_fabs = imported!"core.stdc.math".fabs;
alias __builtin_fabsf = imported!"core.stdc.math".fabsf;
alias __builtin_fabsl = imported!"core.stdc.math".fabsl;
ushort __builtin_bswap16()(ushort value)
{
import core.bitop;
return core.bitop.byteswap(value);
}
uint __builtin_bswap32()(uint value)
{
import core.bitop;
return core.bitop.bswap(value);
}
ulong __builtin_bswap64()(ulong value)
{
import core.bitop;
return core.bitop.bswap(value);
}
// Lazily imported on first use
private alias c_long = imported!"core.stdc.config".c_long;
// Stub these out to no-ops
int __builtin_constant_p(T)(T exp) { return 0; } // should be something like __traits(compiles, enum X = expr)
c_long __builtin_expect()(c_long exp, c_long c) { return exp; }
void* __builtin_assume_aligned()(const void* p, size_t align_, ...) { return cast(void*)p; }
// https://releases.llvm.org/13.0.0/tools/clang/docs/LanguageExtensions.html#builtin-assume
void __builtin_assume(T)(lazy T arg) { }
/* Header on macOS for arm64 references this.
* Don't need to implement it, it just needs to compile
*/
align (16) struct __uint128_t
{
ulong a, b;
}
}
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