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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* trans/target.cpp
* - Target-specific information
*/
#include "target.hpp"
#include <algorithm>
#include "../expand/cfg.hpp"
// TODO: Replace with target selection
#define POINTER_SIZE_BYTES 8
TargetSpec g_target = {
"unix",
"linux",
"gnu",
CodegenMode::Gnu11,
TargetArch {
"x86_64",
64, false,
{ true, false, true, true, true }
}
};
void Target_SetCfg()
{
if(g_target.m_family == "unix") {
Cfg_SetFlag("unix");
}
else if( g_target.m_family == "windows") {
Cfg_SetFlag("windows");
}
Cfg_SetValue("target_family", g_target.m_family);
if( g_target.m_os_name == "linux" )
{
Cfg_SetFlag("linux");
}
Cfg_SetValue("target_env", g_target.m_env_name);
Cfg_SetValue("target_os", g_target.m_os_name);
Cfg_SetValue("target_pointer_width", FMT(g_target.m_arch.m_pointer_bits));
Cfg_SetValue("target_endian", g_target.m_arch.m_big_endian ? "big" : "little");
Cfg_SetValue("target_arch", g_target.m_arch.m_name);
Cfg_SetValueCb("target_has_atomic", [&](const ::std::string& s) {
if(s == "8") return g_target.m_arch.m_atomics.u8; // Has an atomic byte
if(s == "ptr") return g_target.m_arch.m_atomics.ptr; // Has an atomic pointer-sized value
return false;
});
Cfg_SetValueCb("target_feature", [](const ::std::string& s) {
return false;
});
}
bool Target_GetSizeAndAlignOf(const Span& sp, const ::HIR::TypeRef& ty, size_t& out_size, size_t& out_align)
{
TU_MATCHA( (ty.m_data), (te),
(Infer,
BUG(sp, "sizeof on _ type");
),
(Diverge,
out_size = 0;
out_align = 0;
return true;
),
(Primitive,
switch(te)
{
case ::HIR::CoreType::Bool:
case ::HIR::CoreType::U8:
case ::HIR::CoreType::I8:
out_size = 1;
out_align = 1;
return true;
case ::HIR::CoreType::U16:
case ::HIR::CoreType::I16:
out_size = 2;
out_align = 2;
return true;
case ::HIR::CoreType::U32:
case ::HIR::CoreType::I32:
case ::HIR::CoreType::Char:
out_size = 4;
out_align = 4;
return true;
case ::HIR::CoreType::U64:
case ::HIR::CoreType::I64:
out_size = 8;
out_align = 8;
return true;
case ::HIR::CoreType::U128:
case ::HIR::CoreType::I128:
out_size = 16;
// TODO: If i128 is emulated, this can be 8
out_align = 16;
return true;
case ::HIR::CoreType::Usize:
case ::HIR::CoreType::Isize:
out_size = g_target.m_arch.m_pointer_bits / 8;
out_align = g_target.m_arch.m_pointer_bits / 8;
return true;
case ::HIR::CoreType::F32:
out_size = 4;
out_align = 4;
return true;
case ::HIR::CoreType::F64:
out_size = 8;
out_align = 8;
return true;
case ::HIR::CoreType::Str:
BUG(sp, "sizeof on a `str` - unsized");
}
),
(Path,
// TODO:
return false;
),
(Generic,
// Unknown - return false
return false;
),
(TraitObject,
BUG(sp, "sizeof on a trait object - unsized");
),
(ErasedType,
BUG(sp, "sizeof on an erased type - shouldn't exist");
),
(Array,
// TODO:
size_t size;
if( !Target_GetSizeAndAlignOf(sp, *te.inner, size,out_align) )
return false;
size *= te.size_val;
),
(Slice,
BUG(sp, "sizeof on a slice - unsized");
),
(Tuple,
out_size = 0;
out_align = 0;
// TODO: Struct reordering
for(const auto& t : te)
{
size_t size, align;
if( !Target_GetSizeAndAlignOf(sp, t, size,align) )
return false;
if( out_size % align != 0 )
{
out_size += align;
out_size %= align;
}
out_size += size;
out_align = ::std::max(out_align, align);
}
),
(Borrow,
// TODO
),
(Pointer,
// TODO
),
(Function,
// Pointer size
out_size = g_target.m_arch.m_pointer_bits / 8;
out_align = g_target.m_arch.m_pointer_bits / 8;
return true;
),
(Closure,
// TODO.
)
)
return false;
}
bool Target_GetSizeOf(const Span& sp, const ::HIR::TypeRef& ty, size_t& out_size)
{
size_t ignore_align;
return Target_GetSizeAndAlignOf(sp, ty, out_size, ignore_align);
}
bool Target_GetAlignOf(const Span& sp, const ::HIR::TypeRef& ty, size_t& out_align)
{
size_t ignore_size;
return Target_GetSizeAndAlignOf(sp, ty, ignore_size, out_align);
}
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