src/librustc_trans/type_.rs - third_party/rust - Git at Google

 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 #![allow(non_upper_case_globals)]

 use llvm;
 use llvm::{ContextRef, TypeRef, Bool, False, True, TypeKind};
 use llvm::{Float, Double, X86_FP80, PPC_FP128, FP128};

 use context::CodegenCx;

 use syntax::ast;
 use rustc::ty::layout::{self, Align, Size};

 use std::ffi::CString;
 use std::fmt;
 use std::mem;
 use std::ptr;

 use libc::c_uint;

 #[derive(Clone, Copy, PartialEq)]
 #[repr(C)]
 pub struct Type {
     rf: TypeRef
 }

 impl fmt::Debug for Type {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.write_str(&llvm::build_string(|s| unsafe {
             llvm::LLVMRustWriteTypeToString(self.to_ref(), s);
         }).expect("non-UTF8 type description from LLVM"))
     }
 }

 macro_rules! ty {
     ($e:expr) => ( Type::from_ref(unsafe { $e }))
 }

 /// Wrapper for LLVM TypeRef
 impl Type {
     #[inline(always)]
     pub fn from_ref(r: TypeRef) -> Type {
         Type {
             rf: r
         }
     }

     #[inline(always)] // So it doesn't kill --opt-level=0 builds of the compiler
     pub fn to_ref(&self) -> TypeRef {
         self.rf
     }

     pub fn to_ref_slice(slice: &[Type]) -> &[TypeRef] {
         unsafe { mem::transmute(slice) }
     }

     pub fn void(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMVoidTypeInContext(cx.llcx))
     }

     pub fn metadata(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMRustMetadataTypeInContext(cx.llcx))
     }

     pub fn i1(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMInt1TypeInContext(cx.llcx))
     }

     pub fn i8(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMInt8TypeInContext(cx.llcx))
     }

     pub fn i8_llcx(llcx: ContextRef) -> Type {
         ty!(llvm::LLVMInt8TypeInContext(llcx))
     }

     pub fn i16(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMInt16TypeInContext(cx.llcx))
     }

     pub fn i32(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMInt32TypeInContext(cx.llcx))
     }

     pub fn i64(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMInt64TypeInContext(cx.llcx))
     }

     pub fn i128(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMIntTypeInContext(cx.llcx, 128))
     }

     // Creates an integer type with the given number of bits, e.g. i24
     pub fn ix(cx: &CodegenCx, num_bits: u64) -> Type {
         ty!(llvm::LLVMIntTypeInContext(cx.llcx, num_bits as c_uint))
     }

     pub fn f32(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMFloatTypeInContext(cx.llcx))
     }

     pub fn f64(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMDoubleTypeInContext(cx.llcx))
     }

     pub fn bool(cx: &CodegenCx) -> Type {
         Type::i8(cx)
     }

     pub fn char(cx: &CodegenCx) -> Type {
         Type::i32(cx)
     }

     pub fn i8p(cx: &CodegenCx) -> Type {
         Type::i8(cx).ptr_to()
     }

     pub fn i8p_llcx(llcx: ContextRef) -> Type {
         Type::i8_llcx(llcx).ptr_to()
     }

     pub fn isize(cx: &CodegenCx) -> Type {
         match &cx.tcx.sess.target.target.target_pointer_width[..] {
             "16" => Type::i16(cx),
             "32" => Type::i32(cx),
             "64" => Type::i64(cx),
             tws => bug!("Unsupported target word size for int: {}", tws),
         }
     }

     pub fn c_int(cx: &CodegenCx) -> Type {
         match &cx.tcx.sess.target.target.target_c_int_width[..] {
             "16" => Type::i16(cx),
             "32" => Type::i32(cx),
             "64" => Type::i64(cx),
             width => bug!("Unsupported target_c_int_width: {}", width),
         }
     }

     pub fn int_from_ty(cx: &CodegenCx, t: ast::IntTy) -> Type {
         match t {
             ast::IntTy::Isize => cx.isize_ty,
             ast::IntTy::I8 => Type::i8(cx),
             ast::IntTy::I16 => Type::i16(cx),
             ast::IntTy::I32 => Type::i32(cx),
             ast::IntTy::I64 => Type::i64(cx),
             ast::IntTy::I128 => Type::i128(cx),
         }
     }

     pub fn uint_from_ty(cx: &CodegenCx, t: ast::UintTy) -> Type {
         match t {
             ast::UintTy::Usize => cx.isize_ty,
             ast::UintTy::U8 => Type::i8(cx),
             ast::UintTy::U16 => Type::i16(cx),
             ast::UintTy::U32 => Type::i32(cx),
             ast::UintTy::U64 => Type::i64(cx),
             ast::UintTy::U128 => Type::i128(cx),
         }
     }

     pub fn float_from_ty(cx: &CodegenCx, t: ast::FloatTy) -> Type {
         match t {
             ast::FloatTy::F32 => Type::f32(cx),
             ast::FloatTy::F64 => Type::f64(cx),
         }
     }

     pub fn func(args: &[Type], ret: &Type) -> Type {
         let slice: &[TypeRef] = Type::to_ref_slice(args);
         ty!(llvm::LLVMFunctionType(ret.to_ref(), slice.as_ptr(),
                                    args.len() as c_uint, False))
     }

     pub fn variadic_func(args: &[Type], ret: &Type) -> Type {
         let slice: &[TypeRef] = Type::to_ref_slice(args);
         ty!(llvm::LLVMFunctionType(ret.to_ref(), slice.as_ptr(),
                                    args.len() as c_uint, True))
     }

     pub fn struct_(cx: &CodegenCx, els: &[Type], packed: bool) -> Type {
         let els: &[TypeRef] = Type::to_ref_slice(els);
         ty!(llvm::LLVMStructTypeInContext(cx.llcx, els.as_ptr(),
                                           els.len() as c_uint,
                                           packed as Bool))
     }

     pub fn named_struct(cx: &CodegenCx, name: &str) -> Type {
         let name = CString::new(name).unwrap();
         ty!(llvm::LLVMStructCreateNamed(cx.llcx, name.as_ptr()))
     }


     pub fn array(ty: &Type, len: u64) -> Type {
         ty!(llvm::LLVMRustArrayType(ty.to_ref(), len))
     }

     pub fn vector(ty: &Type, len: u64) -> Type {
         ty!(llvm::LLVMVectorType(ty.to_ref(), len as c_uint))
     }

     pub fn kind(&self) -> TypeKind {
         unsafe {
             llvm::LLVMRustGetTypeKind(self.to_ref())
         }
     }

     pub fn set_struct_body(&mut self, els: &[Type], packed: bool) {
         let slice: &[TypeRef] = Type::to_ref_slice(els);
         unsafe {
             llvm::LLVMStructSetBody(self.to_ref(), slice.as_ptr(),
                                     els.len() as c_uint, packed as Bool)
         }
     }

     pub fn ptr_to(&self) -> Type {
         ty!(llvm::LLVMPointerType(self.to_ref(), 0))
     }

     pub fn element_type(&self) -> Type {
         unsafe {
             Type::from_ref(llvm::LLVMGetElementType(self.to_ref()))
         }
     }

     /// Return the number of elements in `self` if it is a LLVM vector type.
     pub fn vector_length(&self) -> usize {
         unsafe {
             llvm::LLVMGetVectorSize(self.to_ref()) as usize
         }
     }

     pub fn func_params(&self) -> Vec<Type> {
         unsafe {
             let n_args = llvm::LLVMCountParamTypes(self.to_ref()) as usize;
             let mut args = vec![Type { rf: ptr::null_mut() }; n_args];
             llvm::LLVMGetParamTypes(self.to_ref(),
                                     args.as_mut_ptr() as *mut TypeRef);
             args
         }
     }

     pub fn float_width(&self) -> usize {
         match self.kind() {
             Float => 32,
             Double => 64,
             X86_FP80 => 80,
             FP128 | PPC_FP128 => 128,
             _ => bug!("llvm_float_width called on a non-float type")
         }
     }

     /// Retrieve the bit width of the integer type `self`.
     pub fn int_width(&self) -> u64 {
         unsafe {
             llvm::LLVMGetIntTypeWidth(self.to_ref()) as u64
         }
     }

     pub fn from_integer(cx: &CodegenCx, i: layout::Integer) -> Type {
         use rustc::ty::layout::Integer::*;
         match i {
             I8 => Type::i8(cx),
             I16 => Type::i16(cx),
             I32 => Type::i32(cx),
             I64 => Type::i64(cx),
             I128 => Type::i128(cx),
         }
     }

     /// Return a LLVM type that has at most the required alignment,
     /// as a conservative approximation for unknown pointee types.
     pub fn pointee_for_abi_align(cx: &CodegenCx, align: Align) -> Type {
         // FIXME(eddyb) We could find a better approximation if ity.align < align.
         let ity = layout::Integer::approximate_abi_align(cx, align);
         Type::from_integer(cx, ity)
     }

     /// Return a LLVM type that has at most the required alignment,
     /// and exactly the required size, as a best-effort padding array.
     pub fn padding_filler(cx: &CodegenCx, size: Size, align: Align) -> Type {
         let unit = layout::Integer::approximate_abi_align(cx, align);
         let size = size.bytes();
         let unit_size = unit.size().bytes();
         assert_eq!(size % unit_size, 0);
         Type::array(&Type::from_integer(cx, unit), size / unit_size)
     }

     pub fn x86_mmx(cx: &CodegenCx) -> Type {
         ty!(llvm::LLVMX86MMXTypeInContext(cx.llcx))
     }
 }
	// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
	// file at the top-level directory of this distribution and at
	// http://rust-lang.org/COPYRIGHT.
	//
	// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
	// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
	// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
	// option. This file may not be copied, modified, or distributed
	// except according to those terms.

	#![allow(non_upper_case_globals)]

	use llvm;
	use llvm::{ContextRef, TypeRef, Bool, False, True, TypeKind};
	use llvm::{Float, Double, X86_FP80, PPC_FP128, FP128};

	use context::CodegenCx;

	use syntax::ast;
	use rustc::ty::layout::{self, Align, Size};

	use std::ffi::CString;
	use std::fmt;
	use std::mem;
	use std::ptr;

	use libc::c_uint;

	#[derive(Clone, Copy, PartialEq)]
	#[repr(C)]
	pub struct Type {
	rf: TypeRef
	}

	impl fmt::Debug for Type {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
	f.write_str(&llvm::build_string(\|s\| unsafe {
	llvm::LLVMRustWriteTypeToString(self.to_ref(), s);
	}).expect("non-UTF8 type description from LLVM"))
	}
	}

	macro_rules! ty {
	($e:expr) => ( Type::from_ref(unsafe { $e }))
	}

	/// Wrapper for LLVM TypeRef
	impl Type {
	#[inline(always)]
	pub fn from_ref(r: TypeRef) -> Type {
	Type {
	rf: r
	}
	}

	#[inline(always)] // So it doesn't kill --opt-level=0 builds of the compiler
	pub fn to_ref(&self) -> TypeRef {
	self.rf
	}

	pub fn to_ref_slice(slice: &[Type]) -> &[TypeRef] {
	unsafe { mem::transmute(slice) }
	}

	pub fn void(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMVoidTypeInContext(cx.llcx))
	}

	pub fn metadata(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMRustMetadataTypeInContext(cx.llcx))
	}

	pub fn i1(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMInt1TypeInContext(cx.llcx))
	}

	pub fn i8(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMInt8TypeInContext(cx.llcx))
	}

	pub fn i8_llcx(llcx: ContextRef) -> Type {
	ty!(llvm::LLVMInt8TypeInContext(llcx))
	}

	pub fn i16(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMInt16TypeInContext(cx.llcx))
	}

	pub fn i32(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMInt32TypeInContext(cx.llcx))
	}

	pub fn i64(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMInt64TypeInContext(cx.llcx))
	}

	pub fn i128(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMIntTypeInContext(cx.llcx, 128))
	}

	// Creates an integer type with the given number of bits, e.g. i24
	pub fn ix(cx: &CodegenCx, num_bits: u64) -> Type {
	ty!(llvm::LLVMIntTypeInContext(cx.llcx, num_bits as c_uint))
	}

	pub fn f32(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMFloatTypeInContext(cx.llcx))
	}

	pub fn f64(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMDoubleTypeInContext(cx.llcx))
	}

	pub fn bool(cx: &CodegenCx) -> Type {
	Type::i8(cx)
	}

	pub fn char(cx: &CodegenCx) -> Type {
	Type::i32(cx)
	}

	pub fn i8p(cx: &CodegenCx) -> Type {
	Type::i8(cx).ptr_to()
	}

	pub fn i8p_llcx(llcx: ContextRef) -> Type {
	Type::i8_llcx(llcx).ptr_to()
	}

	pub fn isize(cx: &CodegenCx) -> Type {
	match &cx.tcx.sess.target.target.target_pointer_width[..] {
	"16" => Type::i16(cx),
	"32" => Type::i32(cx),
	"64" => Type::i64(cx),
	tws => bug!("Unsupported target word size for int: {}", tws),
	}
	}

	pub fn c_int(cx: &CodegenCx) -> Type {
	match &cx.tcx.sess.target.target.target_c_int_width[..] {
	"16" => Type::i16(cx),
	"32" => Type::i32(cx),
	"64" => Type::i64(cx),
	width => bug!("Unsupported target_c_int_width: {}", width),
	}
	}

	pub fn int_from_ty(cx: &CodegenCx, t: ast::IntTy) -> Type {
	match t {
	ast::IntTy::Isize => cx.isize_ty,
	ast::IntTy::I8 => Type::i8(cx),
	ast::IntTy::I16 => Type::i16(cx),
	ast::IntTy::I32 => Type::i32(cx),
	ast::IntTy::I64 => Type::i64(cx),
	ast::IntTy::I128 => Type::i128(cx),
	}
	}

	pub fn uint_from_ty(cx: &CodegenCx, t: ast::UintTy) -> Type {
	match t {
	ast::UintTy::Usize => cx.isize_ty,
	ast::UintTy::U8 => Type::i8(cx),
	ast::UintTy::U16 => Type::i16(cx),
	ast::UintTy::U32 => Type::i32(cx),
	ast::UintTy::U64 => Type::i64(cx),
	ast::UintTy::U128 => Type::i128(cx),
	}
	}

	pub fn float_from_ty(cx: &CodegenCx, t: ast::FloatTy) -> Type {
	match t {
	ast::FloatTy::F32 => Type::f32(cx),
	ast::FloatTy::F64 => Type::f64(cx),
	}
	}

	pub fn func(args: &[Type], ret: &Type) -> Type {
	let slice: &[TypeRef] = Type::to_ref_slice(args);
	ty!(llvm::LLVMFunctionType(ret.to_ref(), slice.as_ptr(),
	args.len() as c_uint, False))
	}

	pub fn variadic_func(args: &[Type], ret: &Type) -> Type {
	let slice: &[TypeRef] = Type::to_ref_slice(args);
	ty!(llvm::LLVMFunctionType(ret.to_ref(), slice.as_ptr(),
	args.len() as c_uint, True))
	}

	pub fn struct_(cx: &CodegenCx, els: &[Type], packed: bool) -> Type {
	let els: &[TypeRef] = Type::to_ref_slice(els);
	ty!(llvm::LLVMStructTypeInContext(cx.llcx, els.as_ptr(),
	els.len() as c_uint,
	packed as Bool))
	}

	pub fn named_struct(cx: &CodegenCx, name: &str) -> Type {
	let name = CString::new(name).unwrap();
	ty!(llvm::LLVMStructCreateNamed(cx.llcx, name.as_ptr()))
	}


	pub fn array(ty: &Type, len: u64) -> Type {
	ty!(llvm::LLVMRustArrayType(ty.to_ref(), len))
	}

	pub fn vector(ty: &Type, len: u64) -> Type {
	ty!(llvm::LLVMVectorType(ty.to_ref(), len as c_uint))
	}

	pub fn kind(&self) -> TypeKind {
	unsafe {
	llvm::LLVMRustGetTypeKind(self.to_ref())
	}
	}

	pub fn set_struct_body(&mut self, els: &[Type], packed: bool) {
	let slice: &[TypeRef] = Type::to_ref_slice(els);
	unsafe {
	llvm::LLVMStructSetBody(self.to_ref(), slice.as_ptr(),
	els.len() as c_uint, packed as Bool)
	}
	}

	pub fn ptr_to(&self) -> Type {
	ty!(llvm::LLVMPointerType(self.to_ref(), 0))
	}

	pub fn element_type(&self) -> Type {
	unsafe {
	Type::from_ref(llvm::LLVMGetElementType(self.to_ref()))
	}
	}

	/// Return the number of elements in `self` if it is a LLVM vector type.
	pub fn vector_length(&self) -> usize {
	unsafe {
	llvm::LLVMGetVectorSize(self.to_ref()) as usize
	}
	}

	pub fn func_params(&self) -> Vec<Type> {
	unsafe {
	let n_args = llvm::LLVMCountParamTypes(self.to_ref()) as usize;
	let mut args = vec![Type { rf: ptr::null_mut() }; n_args];
	llvm::LLVMGetParamTypes(self.to_ref(),
	args.as_mut_ptr() as *mut TypeRef);
	args
	}
	}

	pub fn float_width(&self) -> usize {
	match self.kind() {
	Float => 32,
	Double => 64,
	X86_FP80 => 80,
	FP128 \| PPC_FP128 => 128,
	_ => bug!("llvm_float_width called on a non-float type")
	}
	}

	/// Retrieve the bit width of the integer type `self`.
	pub fn int_width(&self) -> u64 {
	unsafe {
	llvm::LLVMGetIntTypeWidth(self.to_ref()) as u64
	}
	}

	pub fn from_integer(cx: &CodegenCx, i: layout::Integer) -> Type {
	use rustc::ty::layout::Integer::*;
	match i {
	I8 => Type::i8(cx),
	I16 => Type::i16(cx),
	I32 => Type::i32(cx),
	I64 => Type::i64(cx),
	I128 => Type::i128(cx),
	}
	}

	/// Return a LLVM type that has at most the required alignment,
	/// as a conservative approximation for unknown pointee types.
	pub fn pointee_for_abi_align(cx: &CodegenCx, align: Align) -> Type {
	// FIXME(eddyb) We could find a better approximation if ity.align < align.
	let ity = layout::Integer::approximate_abi_align(cx, align);
	Type::from_integer(cx, ity)
	}

	/// Return a LLVM type that has at most the required alignment,
	/// and exactly the required size, as a best-effort padding array.
	pub fn padding_filler(cx: &CodegenCx, size: Size, align: Align) -> Type {
	let unit = layout::Integer::approximate_abi_align(cx, align);
	let size = size.bytes();
	let unit_size = unit.size().bytes();
	assert_eq!(size % unit_size, 0);
	Type::array(&Type::from_integer(cx, unit), size / unit_size)
	}

	pub fn x86_mmx(cx: &CodegenCx) -> Type {
	ty!(llvm::LLVMX86MMXTypeInContext(cx.llcx))
	}
	}