1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208

use libc::{c_uint, c_ulonglong};
use ffi::core;
use ffi::prelude::LLVMValueRef;
use context::Context;
use libc::c_char;
use value::Value;
use ty::*;
use std::mem;
use std::ffi::CStr;

/// A type that can be represented as a constant in LLVM IR.
pub trait Compile<'a> {
    /// Compile this value into a constant in the context given.
    fn compile(self, context: &'a Context) -> &'a Value;
    /// Get the type descriptor for this type in the context given.
    fn get_type(context: &'a Context) -> &'a Type;
}
macro_rules! compile_int(
    ($uty:ty, $sty:ty, $ctx:ident => $ty_ex:expr) => (
        impl<'a> Compile<'a> for $uty {
            fn compile(self, context: &'a Context) -> &'a Value {
                unsafe { core::LLVMConstInt(Self::get_type(context).into(), self as c_ulonglong, 0) }.into()
            }
            fn get_type($ctx: &'a Context) -> &'a Type {
                let $ctx = $ctx.into();
                unsafe { $ty_ex }.into()
            }
        }
        impl<'a> Compile<'a> for $sty {
            fn compile(self, context: &'a Context) -> &'a Value {
                unsafe { core::LLVMConstInt(Self::get_type(context).into(), self as c_ulonglong, 0) }.into()
            }
            fn get_type($ctx: &'a Context) -> &'a Type {
                let $ctx = $ctx.into();
                unsafe { $ty_ex }.into()
            }
        }
    );
    ($uty:ty, $sty:ty, $func:ident) => (
        compile_int!{$uty, $sty, ctx => core::$func(ctx)}
    );
);
impl<'a> Compile<'a> for bool {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe { core::LLVMConstInt(Self::get_type(context).into(), self as c_ulonglong, 0) }.into()
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        unsafe { core::LLVMInt1TypeInContext(ctx.into()) }.into()
    }
}
impl<'a> Compile<'a> for f32 {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe { core::LLVMConstReal(Self::get_type(context).into(), self as f64) }.into()
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        unsafe { core::LLVMFloatTypeInContext(ctx.into()) }.into()
    }
}
impl<'a> Compile<'a> for f64 {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe { core::LLVMConstReal(Self::get_type(context).into(), self) }.into()
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        unsafe { core::LLVMDoubleTypeInContext(ctx.into()) }.into()
    }
}
impl<'a> Compile<'a> for char {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe { core::LLVMConstInt(Self::get_type(context).into(), self as u32 as c_ulonglong, 0) }.into()
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        unsafe { core::LLVMInt32TypeInContext(ctx.into()) }.into()
    }
}
impl<'a> Compile<'a> for *const c_char {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe {
            let len = CStr::from_ptr(self).to_bytes().len();
            core::LLVMConstStringInContext(context.into(), self, len as c_uint, 0).into()
        }
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        PointerType::new(Type::get::<c_char>(ctx))
    }
}
impl<'a> Compile<'a> for *const str {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe { mem::transmute::<_, &str>(self) }.compile(context)
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        <&str as Compile<'a>>::get_type(ctx)
    }
}
impl<'a, 'b> Compile<'a> for &'b str {
    fn compile(self, context: &'a Context) -> &'a Value {
        self.as_bytes().compile(context)
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        <&'b [u8] as Compile<'a>>::get_type(ctx)
    }
}

impl<'a, 'b> Compile<'a> for &'b [u8] {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe {
            let ptr = self.as_ptr() as *const c_char;
            let len = self.len() as c_uint;
            let ptr = core::LLVMConstStringInContext(context.into(), ptr, len, 1).into();
            let size = self.len().compile(context);
            Value::new_struct(context, &[ptr, size], false)
        }
    }
    fn get_type(ctx: &'a Context) -> &'a Type {
        let usize_t = usize::get_type(ctx);
        StructType::new(ctx, &[usize_t, usize_t], false)
    }
}
compile_int!{u8, i8, LLVMInt8TypeInContext}
compile_int!{u16, i16, LLVMInt16TypeInContext}
compile_int!{u32, i32, LLVMInt32TypeInContext}
compile_int!{u64, i64, LLVMInt64TypeInContext}
compile_int!{usize, isize, ctx => core::LLVMIntTypeInContext(ctx, mem::size_of::<isize>() as c_uint * 8)}
impl<'a> Compile<'a> for () {
    fn compile(self, context: &'a Context) -> &'a Value {
        unsafe { core::LLVMConstNull(Self::get_type(context).into()) }.into()
    }
    fn get_type(context: &'a Context) -> &'a Type {
        unsafe { core::LLVMVoidTypeInContext(context.into()) }.into()
    }
}

macro_rules! compile_tuple(
    ($($name:ident = $oname:ident),+) => (
        impl<'a, $($name),+> Compile<'a> for ($($name),+) where $($name:Compile<'a>),+ {
            fn compile(self, context: &'a Context) -> &'a Value {
                let ($($oname, )+) = self;
                Value::new_struct(context, &[$($oname.compile(context)),+], false)
            }
            fn get_type(context: &'a Context) -> &'a Type {
                StructType::new(context, &[$($name::get_type(context)),+], false)
            }
        }
    )
);
compile_tuple!{A = a, B = b}
compile_tuple!{A = a, B = b, C = c}
compile_tuple!{A = a, B = b, C = c, D = d}
compile_tuple!{A = a, B = b, C = c, D = d, E = e}
compile_tuple!{A = a, B = b, C = c, D = d, E = e, F = f}
compile_tuple!{A = a, B = b, C = c, D = d, E = e, F = f, G = g}

macro_rules! compile_array(
    ($ty:ty, $num:expr) => (
        impl<'a, T> Compile<'a> for $ty where T: Copy + Compile<'a> + 'a {
            fn compile(self, context: &'a Context) -> &'a Value {
                let values:Vec<_> = self.iter().map(|&value| value.compile(context)).collect();
                unsafe { core::LLVMConstVector(values.as_ptr() as *mut LLVMValueRef, $num) }.into()
            }
            fn get_type(context: &'a Context) -> &'a Type {
                VectorType::new(Type::get::<T>(context), $num)
            }
        }
    )
);
compile_array!{[T; 0], 0}
compile_array!{[T; 1], 1}
compile_array!{[T; 2], 2}
compile_array!{[T; 3], 3}
compile_array!{[T; 4], 4}
compile_array!{[T; 5], 5}
compile_array!{[T; 6], 6}

macro_rules! compile_func(
    ($($name:ident),*) => (
        impl<'a, R, $($name),*> Compile<'a> for fn($($name),*) -> R where R:Compile<'a>, $($name:Compile<'a>),* {
            fn compile(self, context: &'a Context) -> &'a Value {
                unsafe {
                    let as_usize: usize = mem::transmute(self);
                    let value = as_usize.compile(context);
                    core::LLVMConstIntToPtr(value.into(), Self::get_type(context).into())
                }.into()
            }
            fn get_type(context: &'a Context) -> &'a Type {
                FunctionType::new(R::get_type(context), &[$($name::get_type(context)),*])
            }
        }
        impl<'a, R, $($name),*> Compile<'a> for extern fn($($name),*) -> R where R:Compile<'a>, $($name:Compile<'a>),* {
            fn compile(self, context: &'a Context) -> &'a Value {
                unsafe {
                    let as_usize: usize = mem::transmute(self);
                    let value = as_usize.compile(context);
                    core::LLVMConstIntToPtr(value.into(), Self::get_type(context).into())
                }.into()
            }
            fn get_type(context: &'a Context) -> &'a Type {
                FunctionType::new(R::get_type(context), &[$($name::get_type(context)),*])
            }
        }
    )
);
compile_func!{}
compile_func!{A}
compile_func!{A, B}
compile_func!{A, B, C}
compile_func!{A, B, C, D}
compile_func!{A, B, C, D, E}
compile_func!{A, B, C, D, E, F}
compile_func!{A, B, C, D, E, F, G}