src/librustc_trans/type_.rs

   1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![allow(non_upper_case_globals)]
  12
  13 use llvm;
  14 use llvm::{ContextRef, TypeRef, Bool, False, True, TypeKind};
  15 use llvm::{Float, Double, X86_FP80, PPC_FP128, FP128};
  16
  17 use context::CrateContext;
  18
  19 use syntax::ast;
  20 use rustc::ty::layout;
  21
  22 use std::ffi::CString;
  23 use std::fmt;
  24 use std::mem;
  25 use std::ptr;
  26
  27 use libc::c_uint;
  28
  29 #[derive(Clone, Copy, PartialEq)]
  30 #[repr(C)]
  31 pub struct Type {
  32     rf: TypeRef
  33 }
  34
  35 impl fmt::Debug for Type {
  36     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  37         f.write_str(&llvm::build_string(|s| unsafe {
  38             llvm::LLVMRustWriteTypeToString(self.to_ref(), s);
  39         }).expect("non-UTF8 type description from LLVM"))
  40     }
  41 }
  42
  43 macro_rules! ty {
  44     ($e:expr) => ( Type::from_ref(unsafe { $e }))
  45 }
  46
  47 /// Wrapper for LLVM TypeRef
  48 impl Type {
  49     #[inline(always)]
  50     pub fn from_ref(r: TypeRef) -> Type {
  51         Type {
  52             rf: r
  53         }
  54     }
  55
  56     #[inline(always)] // So it doesn't kill --opt-level=0 builds of the compiler
  57     pub fn to_ref(&self) -> TypeRef {
  58         self.rf
  59     }
  60
  61     pub fn to_ref_slice(slice: &[Type]) -> &[TypeRef] {
  62         unsafe { mem::transmute(slice) }
  63     }
  64
  65     pub fn void(ccx: &CrateContext) -> Type {
  66         ty!(llvm::LLVMVoidTypeInContext(ccx.llcx()))
  67     }
  68
  69     pub fn nil(ccx: &CrateContext) -> Type {
  70         Type::empty_struct(ccx)
  71     }
  72
  73     pub fn metadata(ccx: &CrateContext) -> Type {
  74         ty!(llvm::LLVMRustMetadataTypeInContext(ccx.llcx()))
  75     }
  76
  77     pub fn i1(ccx: &CrateContext) -> Type {
  78         ty!(llvm::LLVMInt1TypeInContext(ccx.llcx()))
  79     }
  80
  81     pub fn i8(ccx: &CrateContext) -> Type {
  82         ty!(llvm::LLVMInt8TypeInContext(ccx.llcx()))
  83     }
  84
  85     pub fn i8_llcx(llcx: ContextRef) -> Type {
  86         ty!(llvm::LLVMInt8TypeInContext(llcx))
  87     }
  88
  89     pub fn i16(ccx: &CrateContext) -> Type {
  90         ty!(llvm::LLVMInt16TypeInContext(ccx.llcx()))
  91     }
  92
  93     pub fn i32(ccx: &CrateContext) -> Type {
  94         ty!(llvm::LLVMInt32TypeInContext(ccx.llcx()))
  95     }
  96
  97     pub fn i64(ccx: &CrateContext) -> Type {
  98         ty!(llvm::LLVMInt64TypeInContext(ccx.llcx()))
  99     }
 100
 101     pub fn i128(ccx: &CrateContext) -> Type {
 102         ty!(llvm::LLVMIntTypeInContext(ccx.llcx(), 128))
 103     }
 104
 105     // Creates an integer type with the given number of bits, e.g. i24
 106     pub fn ix(ccx: &CrateContext, num_bits: u64) -> Type {
 107         ty!(llvm::LLVMIntTypeInContext(ccx.llcx(), num_bits as c_uint))
 108     }
 109
 110     pub fn f32(ccx: &CrateContext) -> Type {
 111         ty!(llvm::LLVMFloatTypeInContext(ccx.llcx()))
 112     }
 113
 114     pub fn f64(ccx: &CrateContext) -> Type {
 115         ty!(llvm::LLVMDoubleTypeInContext(ccx.llcx()))
 116     }
 117
 118     pub fn bool(ccx: &CrateContext) -> Type {
 119         Type::i8(ccx)
 120     }
 121
 122     pub fn char(ccx: &CrateContext) -> Type {
 123         Type::i32(ccx)
 124     }
 125
 126     pub fn i8p(ccx: &CrateContext) -> Type {
 127         Type::i8(ccx).ptr_to()
 128     }
 129
 130     pub fn i8p_llcx(llcx: ContextRef) -> Type {
 131         Type::i8_llcx(llcx).ptr_to()
 132     }
 133
 134     pub fn isize(ccx: &CrateContext) -> Type {
 135         match &ccx.tcx().sess.target.target.target_pointer_width[..] {
 136             "16" => Type::i16(ccx),
 137             "32" => Type::i32(ccx),
 138             "64" => Type::i64(ccx),
 139             tws => bug!("Unsupported target word size for int: {}", tws),
 140         }
 141     }
 142
 143     pub fn c_int(ccx: &CrateContext) -> Type {
 144         match &ccx.tcx().sess.target.target.target_c_int_width[..] {
 145             "16" => Type::i16(ccx),
 146             "32" => Type::i32(ccx),
 147             "64" => Type::i64(ccx),
 148             width => bug!("Unsupported target_c_int_width: {}", width),
 149         }
 150     }
 151
 152     pub fn int_from_ty(ccx: &CrateContext, t: ast::IntTy) -> Type {
 153         match t {
 154             ast::IntTy::Is => ccx.isize_ty(),
 155             ast::IntTy::I8 => Type::i8(ccx),
 156             ast::IntTy::I16 => Type::i16(ccx),
 157             ast::IntTy::I32 => Type::i32(ccx),
 158             ast::IntTy::I64 => Type::i64(ccx),
 159             ast::IntTy::I128 => Type::i128(ccx),
 160         }
 161     }
 162
 163     pub fn uint_from_ty(ccx: &CrateContext, t: ast::UintTy) -> Type {
 164         match t {
 165             ast::UintTy::Us => ccx.isize_ty(),
 166             ast::UintTy::U8 => Type::i8(ccx),
 167             ast::UintTy::U16 => Type::i16(ccx),
 168             ast::UintTy::U32 => Type::i32(ccx),
 169             ast::UintTy::U64 => Type::i64(ccx),
 170             ast::UintTy::U128 => Type::i128(ccx),
 171         }
 172     }
 173
 174     pub fn float_from_ty(ccx: &CrateContext, t: ast::FloatTy) -> Type {
 175         match t {
 176             ast::FloatTy::F32 => Type::f32(ccx),
 177             ast::FloatTy::F64 => Type::f64(ccx),
 178         }
 179     }
 180
 181     pub fn func(args: &[Type], ret: &Type) -> Type {
 182         let slice: &[TypeRef] = Type::to_ref_slice(args);
 183         ty!(llvm::LLVMFunctionType(ret.to_ref(), slice.as_ptr(),
 184                                    args.len() as c_uint, False))
 185     }
 186
 187     pub fn variadic_func(args: &[Type], ret: &Type) -> Type {
 188         let slice: &[TypeRef] = Type::to_ref_slice(args);
 189         ty!(llvm::LLVMFunctionType(ret.to_ref(), slice.as_ptr(),
 190                                    args.len() as c_uint, True))
 191     }
 192
 193     pub fn struct_(ccx: &CrateContext, els: &[Type], packed: bool) -> Type {
 194         let els: &[TypeRef] = Type::to_ref_slice(els);
 195         ty!(llvm::LLVMStructTypeInContext(ccx.llcx(), els.as_ptr(),
 196                                           els.len() as c_uint,
 197                                           packed as Bool))
 198     }
 199
 200     pub fn named_struct(ccx: &CrateContext, name: &str) -> Type {
 201         let name = CString::new(name).unwrap();
 202         ty!(llvm::LLVMStructCreateNamed(ccx.llcx(), name.as_ptr()))
 203     }
 204
 205     pub fn empty_struct(ccx: &CrateContext) -> Type {
 206         Type::struct_(ccx, &[], false)
 207     }
 208
 209     pub fn array(ty: &Type, len: u64) -> Type {
 210         ty!(llvm::LLVMRustArrayType(ty.to_ref(), len))
 211     }
 212
 213     pub fn vector(ty: &Type, len: u64) -> Type {
 214         ty!(llvm::LLVMVectorType(ty.to_ref(), len as c_uint))
 215     }
 216
 217     pub fn vec(ccx: &CrateContext, ty: &Type) -> Type {
 218         Type::struct_(ccx,
 219             &[Type::array(ty, 0), Type::isize(ccx)],
 220         false)
 221     }
 222
 223     pub fn opaque_vec(ccx: &CrateContext) -> Type {
 224         Type::vec(ccx, &Type::i8(ccx))
 225     }
 226
 227     pub fn vtable_ptr(ccx: &CrateContext) -> Type {
 228         Type::func(&[Type::i8p(ccx)], &Type::void(ccx)).ptr_to().ptr_to()
 229     }
 230
 231     pub fn kind(&self) -> TypeKind {
 232         unsafe {
 233             llvm::LLVMRustGetTypeKind(self.to_ref())
 234         }
 235     }
 236
 237     pub fn set_struct_body(&mut self, els: &[Type], packed: bool) {
 238         let slice: &[TypeRef] = Type::to_ref_slice(els);
 239         unsafe {
 240             llvm::LLVMStructSetBody(self.to_ref(), slice.as_ptr(),
 241                                     els.len() as c_uint, packed as Bool)
 242         }
 243     }
 244
 245     pub fn ptr_to(&self) -> Type {
 246         ty!(llvm::LLVMPointerType(self.to_ref(), 0))
 247     }
 248
 249     pub fn element_type(&self) -> Type {
 250         unsafe {
 251             Type::from_ref(llvm::LLVMGetElementType(self.to_ref()))
 252         }
 253     }
 254
 255     /// Return the number of elements in `self` if it is a LLVM vector type.
 256     pub fn vector_length(&self) -> usize {
 257         unsafe {
 258             llvm::LLVMGetVectorSize(self.to_ref()) as usize
 259         }
 260     }
 261
 262     pub fn field_types(&self) -> Vec<Type> {
 263         unsafe {
 264             let n_elts = llvm::LLVMCountStructElementTypes(self.to_ref()) as usize;
 265             if n_elts == 0 {
 266                 return Vec::new();
 267             }
 268             let mut elts = vec![Type { rf: ptr::null_mut() }; n_elts];
 269             llvm::LLVMGetStructElementTypes(self.to_ref(),
 270                                             elts.as_mut_ptr() as *mut TypeRef);
 271             elts
 272         }
 273     }
 274
 275     pub fn func_params(&self) -> Vec<Type> {
 276         unsafe {
 277             let n_args = llvm::LLVMCountParamTypes(self.to_ref()) as usize;
 278             let mut args = vec![Type { rf: ptr::null_mut() }; n_args];
 279             llvm::LLVMGetParamTypes(self.to_ref(),
 280                                     args.as_mut_ptr() as *mut TypeRef);
 281             args
 282         }
 283     }
 284
 285     pub fn float_width(&self) -> usize {
 286         match self.kind() {
 287             Float => 32,
 288             Double => 64,
 289             X86_FP80 => 80,
 290             FP128 | PPC_FP128 => 128,
 291             _ => bug!("llvm_float_width called on a non-float type")
 292         }
 293     }
 294
 295     /// Retrieve the bit width of the integer type `self`.
 296     pub fn int_width(&self) -> u64 {
 297         unsafe {
 298             llvm::LLVMGetIntTypeWidth(self.to_ref()) as u64
 299         }
 300     }
 301
 302     pub fn from_integer(cx: &CrateContext, i: layout::Integer) -> Type {
 303         use rustc::ty::layout::Integer::*;
 304         match i {
 305             I1 => Type::i1(cx),
 306             I8 => Type::i8(cx),
 307             I16 => Type::i16(cx),
 308             I32 => Type::i32(cx),
 309             I64 => Type::i64(cx),
 310             I128 => Type::i128(cx),
 311         }
 312     }
 313 }