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| 1 | +// Copyright 2012 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 | +/*! |
| 12 | +# Translation of inline assembly. |
| 13 | +*/ |
| 14 | + |
| 15 | +use core::prelude::*; |
| 16 | + |
| 17 | +use lib; |
| 18 | +use middle::trans::build::*; |
| 19 | +use middle::trans::callee; |
| 20 | +use middle::trans::common::*; |
| 21 | +use middle::ty; |
| 22 | + |
| 23 | +use syntax::ast; |
| 24 | + |
| 25 | +// Take an inline assembly expression and splat it out via LLVM |
| 26 | +pub fn trans_inline_asm(bcx: block, ia: &ast::inline_asm) -> block { |
| 27 | + |
| 28 | + let mut bcx = bcx; |
| 29 | + let mut constraints = ~[]; |
| 30 | + let mut cleanups = ~[]; |
| 31 | + let mut aoutputs = ~[]; |
| 32 | + |
| 33 | + // Prepare the output operands |
| 34 | + let outputs = do ia.outputs.map |&(c, out)| { |
| 35 | + constraints.push(copy *c); |
| 36 | + |
| 37 | + let aoutty = ty::arg { |
| 38 | + mode: ast::expl(ast::by_copy), |
| 39 | + ty: expr_ty(bcx, out) |
| 40 | + }; |
| 41 | + aoutputs.push(unpack_result!(bcx, { |
| 42 | + callee::trans_arg_expr(bcx, aoutty, out, &mut cleanups, None, callee::DontAutorefArg) |
| 43 | + })); |
| 44 | + |
| 45 | + let e = match out.node { |
| 46 | + ast::expr_addr_of(_, e) => e, |
| 47 | + _ => fail!(~"Expression must be addr of") |
| 48 | + }; |
| 49 | +
|
| 50 | + let outty = ty::arg { |
| 51 | + mode: ast::expl(ast::by_copy), |
| 52 | + ty: expr_ty(bcx, e) |
| 53 | + }; |
| 54 | +
|
| 55 | + unpack_result!(bcx, { |
| 56 | + callee::trans_arg_expr(bcx, outty, e, &mut cleanups, None, callee::DontAutorefArg) |
| 57 | + }) |
| 58 | +
|
| 59 | + }; |
| 60 | +
|
| 61 | + for cleanups.each |c| { |
| 62 | + revoke_clean(bcx, *c); |
| 63 | + } |
| 64 | + cleanups.clear(); |
| 65 | +
|
| 66 | + // Now the input operands |
| 67 | + let inputs = do ia.inputs.map |&(c, in)| { |
| 68 | + constraints.push(copy *c); |
| 69 | +
|
| 70 | + let inty = ty::arg { |
| 71 | + mode: ast::expl(ast::by_copy), |
| 72 | + ty: expr_ty(bcx, in) |
| 73 | + }; |
| 74 | +
|
| 75 | + unpack_result!(bcx, { |
| 76 | + callee::trans_arg_expr(bcx, inty, in, &mut cleanups, None, callee::DontAutorefArg) |
| 77 | + }) |
| 78 | +
|
| 79 | + }; |
| 80 | +
|
| 81 | + for cleanups.each |c| { |
| 82 | + revoke_clean(bcx, *c); |
| 83 | + } |
| 84 | +
|
| 85 | + let mut constraints = str::connect(constraints, ","); |
| 86 | +
|
| 87 | + let mut clobbers = getClobbers(); |
| 88 | + if *ia.clobbers != ~"" && clobbers != ~"" { |
| 89 | + clobbers = *ia.clobbers + ~"," + clobbers; |
| 90 | + } else { |
| 91 | + clobbers += *ia.clobbers; |
| 92 | + }; |
| 93 | +
|
| 94 | + // Add the clobbers to our constraints list |
| 95 | + if clobbers != ~"" && constraints != ~"" { |
| 96 | + constraints += ~"," + clobbers; |
| 97 | + } else { |
| 98 | + constraints += clobbers; |
| 99 | + } |
| 100 | +
|
| 101 | + debug!("Asm Constraints: %?", constraints); |
| 102 | +
|
| 103 | + let numOutputs = outputs.len(); |
| 104 | +
|
| 105 | + // Depending on how many outputs we have, the return type is different |
| 106 | + let output = if numOutputs == 0 { |
| 107 | + T_void() |
| 108 | + } else if numOutputs == 1 { |
| 109 | + val_ty(outputs[0]) |
| 110 | + } else { |
| 111 | + T_struct(outputs.map(|o| val_ty(*o))) |
| 112 | + }; |
| 113 | +
|
| 114 | + let dialect = match ia.dialect { |
| 115 | + ast::asm_att => lib::llvm::AD_ATT, |
| 116 | + ast::asm_intel => lib::llvm::AD_Intel |
| 117 | + }; |
| 118 | +
|
| 119 | + let r = do str::as_c_str(*ia.asm) |a| { |
| 120 | + do str::as_c_str(constraints) |c| { |
| 121 | + InlineAsmCall(bcx, a, c, inputs, output, ia.volatile, ia.alignstack, dialect) |
| 122 | + } |
| 123 | + }; |
| 124 | +
|
| 125 | + // Again, based on how many outputs we have |
| 126 | + if numOutputs == 1 { |
| 127 | + let op = PointerCast(bcx, aoutputs[0], T_ptr(val_ty(outputs[0]))); |
| 128 | + Store(bcx, r, op); |
| 129 | + } else { |
| 130 | + for aoutputs.eachi |i, o| { |
| 131 | + let v = ExtractValue(bcx, r, i); |
| 132 | + let op = PointerCast(bcx, *o, T_ptr(val_ty(outputs[i]))); |
| 133 | + Store(bcx, v, op); |
| 134 | + } |
| 135 | + } |
| 136 | +
|
| 137 | + return bcx; |
| 138 | +
|
| 139 | +} |
| 140 | +
|
| 141 | +// Default per-arch clobbers |
| 142 | +// Basically what clang does |
| 143 | +
|
| 144 | +#[cfg(target_arch = "arm")] |
| 145 | +#[cfg(target_arch = "mips")] |
| 146 | +fn getClobbers() -> ~str { |
| 147 | + ~"" |
| 148 | +} |
| 149 | +
|
| 150 | +#[cfg(target_arch = "x86")] |
| 151 | +#[cfg(target_arch = "x86_64")] |
| 152 | +fn getClobbers() -> ~str { |
| 153 | + ~"~{dirflag},~{fpsr},~{flags}" |
| 154 | +} |
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