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970d7e83 | 1 | // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT |
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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 | // Information concerning the machine representation of various types. | |
12 | ||
1a4d82fc | 13 | #![allow(non_camel_case_types)] |
223e47cc | 14 | |
c34b1796 | 15 | use llvm::{self, ValueRef}; |
54a0048b | 16 | use common::*; |
1a4d82fc | 17 | |
54a0048b | 18 | use type_::Type; |
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19 | |
20 | pub type llbits = u64; | |
21 | pub type llsize = u64; | |
22 | pub type llalign = u32; | |
970d7e83 | 23 | |
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24 | // ______________________________________________________________________ |
25 | // compute sizeof / alignof | |
26 | ||
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27 | // Returns the number of bytes between successive elements of type T in an |
28 | // array of T. This is the "ABI" size. It includes any ABI-mandated padding. | |
1a4d82fc | 29 | pub fn llsize_of_alloc(cx: &CrateContext, ty: Type) -> llsize { |
223e47cc | 30 | unsafe { |
c1a9b12d | 31 | return llvm::LLVMABISizeOfType(cx.td(), ty.to_ref()); |
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32 | } |
33 | } | |
34 | ||
223e47cc | 35 | /// Returns the "real" size of the type in bits. |
1a4d82fc | 36 | pub fn llbitsize_of_real(cx: &CrateContext, ty: Type) -> llbits { |
223e47cc | 37 | unsafe { |
c1a9b12d | 38 | llvm::LLVMSizeOfTypeInBits(cx.td(), ty.to_ref()) |
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39 | } |
40 | } | |
41 | ||
42 | /// Returns the size of the type as an LLVM constant integer value. | |
970d7e83 | 43 | pub fn llsize_of(cx: &CrateContext, ty: Type) -> ValueRef { |
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44 | // Once upon a time, this called LLVMSizeOf, which does a |
45 | // getelementptr(1) on a null pointer and casts to an int, in | |
46 | // order to obtain the type size as a value without requiring the | |
47 | // target data layout. But we have the target data layout, so | |
48 | // there's no need for that contrivance. The instruction | |
49 | // selection DAG generator would flatten that GEP(1) node into a | |
50 | // constant of the type's alloc size, so let's save it some work. | |
970d7e83 | 51 | return C_uint(cx, llsize_of_alloc(cx, ty)); |
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52 | } |
53 | ||
223e47cc | 54 | // Returns the preferred alignment of the given type for the current target. |
970d7e83 | 55 | // The preferred alignment may be larger than the alignment used when |
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56 | // packing the type into structs. This will be used for things like |
57 | // allocations inside a stack frame, which LLVM has a free hand in. | |
1a4d82fc | 58 | pub fn llalign_of_pref(cx: &CrateContext, ty: Type) -> llalign { |
223e47cc | 59 | unsafe { |
c1a9b12d | 60 | return llvm::LLVMPreferredAlignmentOfType(cx.td(), ty.to_ref()); |
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61 | } |
62 | } | |
63 | ||
970d7e83 | 64 | // Returns the minimum alignment of a type required by the platform. |
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65 | // This is the alignment that will be used for struct fields, arrays, |
66 | // and similar ABI-mandated things. | |
1a4d82fc | 67 | pub fn llalign_of_min(cx: &CrateContext, ty: Type) -> llalign { |
223e47cc | 68 | unsafe { |
c1a9b12d | 69 | return llvm::LLVMABIAlignmentOfType(cx.td(), ty.to_ref()); |
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70 | } |
71 | } | |
72 | ||
c34b1796 | 73 | pub fn llelement_offset(cx: &CrateContext, struct_ty: Type, element: usize) -> u64 { |
1a4d82fc | 74 | unsafe { |
c1a9b12d | 75 | return llvm::LLVMOffsetOfElement(cx.td(), |
d9579d0f | 76 | struct_ty.to_ref(), |
1a4d82fc | 77 | element as u32); |
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78 | } |
79 | } |