135 lines
4.3 KiB
Rust
135 lines
4.3 KiB
Rust
// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! # Translation of inline assembly.
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use llvm::{self, ValueRef};
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use base;
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use common::*;
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use type_of;
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use type_::Type;
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use builder::Builder;
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use rustc::hir;
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use rustc::ty::Ty;
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use mir::lvalue::Alignment;
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use std::ffi::CString;
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use syntax::ast::AsmDialect;
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use libc::{c_uint, c_char};
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// Take an inline assembly expression and splat it out via LLVM
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pub fn trans_inline_asm<'a, 'tcx>(
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bcx: &Builder<'a, 'tcx>,
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ia: &hir::InlineAsm,
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outputs: Vec<(ValueRef, Ty<'tcx>)>,
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mut inputs: Vec<ValueRef>
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) {
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let mut ext_constraints = vec![];
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let mut output_types = vec![];
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// Prepare the output operands
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let mut indirect_outputs = vec![];
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for (i, (out, &(val, ty))) in ia.outputs.iter().zip(&outputs).enumerate() {
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let val = if out.is_rw || out.is_indirect {
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Some(base::load_ty(bcx, val, Alignment::Packed, ty))
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} else {
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None
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};
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if out.is_rw {
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inputs.push(val.unwrap());
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ext_constraints.push(i.to_string());
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}
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if out.is_indirect {
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indirect_outputs.push(val.unwrap());
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} else {
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output_types.push(type_of::type_of(bcx.ccx, ty));
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}
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}
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if !indirect_outputs.is_empty() {
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indirect_outputs.extend_from_slice(&inputs);
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inputs = indirect_outputs;
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}
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let clobbers = ia.clobbers.iter()
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.map(|s| format!("~{{{}}}", &s));
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// Default per-arch clobbers
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// Basically what clang does
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let arch_clobbers = match &bcx.sess().target.target.arch[..] {
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"x86" | "x86_64" => vec!["~{dirflag}", "~{fpsr}", "~{flags}"],
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_ => Vec::new()
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};
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let all_constraints =
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ia.outputs.iter().map(|out| out.constraint.to_string())
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.chain(ia.inputs.iter().map(|s| s.to_string()))
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.chain(ext_constraints)
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.chain(clobbers)
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.chain(arch_clobbers.iter().map(|s| s.to_string()))
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.collect::<Vec<String>>().join(",");
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debug!("Asm Constraints: {}", &all_constraints);
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// Depending on how many outputs we have, the return type is different
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let num_outputs = output_types.len();
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let output_type = match num_outputs {
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0 => Type::void(bcx.ccx),
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1 => output_types[0],
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_ => Type::struct_(bcx.ccx, &output_types, false)
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};
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let dialect = match ia.dialect {
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AsmDialect::Att => llvm::AsmDialect::Att,
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AsmDialect::Intel => llvm::AsmDialect::Intel,
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};
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let asm = CString::new(ia.asm.as_str().as_bytes()).unwrap();
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let constraint_cstr = CString::new(all_constraints).unwrap();
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let r = bcx.inline_asm_call(
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asm.as_ptr(),
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constraint_cstr.as_ptr(),
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&inputs,
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output_type,
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ia.volatile,
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ia.alignstack,
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dialect
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);
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// Again, based on how many outputs we have
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let outputs = ia.outputs.iter().zip(&outputs).filter(|&(ref o, _)| !o.is_indirect);
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for (i, (_, &(val, _))) in outputs.enumerate() {
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let v = if num_outputs == 1 { r } else { bcx.extract_value(r, i) };
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bcx.store(v, val, None);
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}
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// Store mark in a metadata node so we can map LLVM errors
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// back to source locations. See #17552.
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unsafe {
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let key = "srcloc";
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let kind = llvm::LLVMGetMDKindIDInContext(bcx.ccx.llcx(),
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key.as_ptr() as *const c_char, key.len() as c_uint);
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let val: llvm::ValueRef = C_i32(bcx.ccx, ia.ctxt.outer().as_u32() as i32);
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llvm::LLVMSetMetadata(r, kind,
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llvm::LLVMMDNodeInContext(bcx.ccx.llcx(), &val, 1));
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}
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}
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pub fn trans_global_asm<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
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ga: &hir::GlobalAsm) {
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let asm = CString::new(ga.asm.as_str().as_bytes()).unwrap();
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unsafe {
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llvm::LLVMRustAppendModuleInlineAsm(ccx.llmod(), asm.as_ptr());
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}
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}
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