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// Copyright 2012-2015 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.
use llvm;
use context::CodegenCx;
use type_of::LayoutLlvmExt;
use builder::Builder;
use value::Value;
use rustc::hir;
use rustc_codegen_ssa::traits::*;
use rustc_codegen_ssa::mir::place::PlaceRef;
use rustc_codegen_ssa::mir::operand::OperandValue;
use std::ffi::CString;
use libc::{c_uint, c_char};
impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
fn codegen_inline_asm(
&mut self,
ia: &hir::InlineAsm,
outputs: Vec<PlaceRef<'tcx, &'ll Value>>,
mut inputs: Vec<&'ll Value>
) -> bool {
let mut ext_constraints = vec![];
let mut output_types = vec![];
// Prepare the output operands
let mut indirect_outputs = vec![];
for (i, (out, &place)) in ia.outputs.iter().zip(&outputs).enumerate() {
if out.is_rw {
inputs.push(self.load_operand(place).immediate());
ext_constraints.push(i.to_string());
}
if out.is_indirect {
indirect_outputs.push(self.load_operand(place).immediate());
} else {
output_types.push(place.layout.llvm_type(self.cx()));
}
}
if !indirect_outputs.is_empty() {
indirect_outputs.extend_from_slice(&inputs);
inputs = indirect_outputs;
}
let clobbers = ia.clobbers.iter()
.map(|s| format!("~{{{}}}", &s));
// Default per-arch clobbers
// Basically what clang does
let arch_clobbers = match &self.sess().target.target.arch[..] {
"x86" | "x86_64" => vec!["~{dirflag}", "~{fpsr}", "~{flags}"],
"mips" | "mips64" => vec!["~{$1}"],
_ => Vec::new()
};
let all_constraints =
ia.outputs.iter().map(|out| out.constraint.to_string())
.chain(ia.inputs.iter().map(|s| s.to_string()))
.chain(ext_constraints)
.chain(clobbers)
.chain(arch_clobbers.iter().map(|s| s.to_string()))
.collect::<Vec<String>>().join(",");
debug!("Asm Constraints: {}", &all_constraints);
// Depending on how many outputs we have, the return type is different
let num_outputs = output_types.len();
let output_type = match num_outputs {
0 => self.type_void(),
1 => output_types[0],
_ => self.type_struct(&output_types, false)
};
let asm = CString::new(ia.asm.as_str().as_bytes()).unwrap();
let constraint_cstr = CString::new(all_constraints).unwrap();
let r = self.inline_asm_call(
&asm,
&constraint_cstr,
&inputs,
output_type,
ia.volatile,
ia.alignstack,
ia.dialect
);
if r.is_none() {
return false;
}
let r = r.unwrap();
// Again, based on how many outputs we have
let outputs = ia.outputs.iter().zip(&outputs).filter(|&(ref o, _)| !o.is_indirect);
for (i, (_, &place)) in outputs.enumerate() {
let v = if num_outputs == 1 { r } else { self.extract_value(r, i as u64) };
OperandValue::Immediate(v).store(self, place);
}
// Store mark in a metadata node so we can map LLVM errors
// back to source locations. See #17552.
unsafe {
let key = "srcloc";
let kind = llvm::LLVMGetMDKindIDInContext(self.llcx,
key.as_ptr() as *const c_char, key.len() as c_uint);
let val: &'ll Value = self.const_i32(ia.ctxt.outer().as_u32() as i32);
llvm::LLVMSetMetadata(r, kind,
llvm::LLVMMDNodeInContext(self.llcx, &val, 1));
}
true
}
}
impl AsmMethods<'tcx> for CodegenCx<'ll, 'tcx> {
fn codegen_global_asm(&self, ga: &hir::GlobalAsm) {
let asm = CString::new(ga.asm.as_str().as_bytes()).unwrap();
unsafe {
llvm::LLVMRustAppendModuleInlineAsm(self.llmod, asm.as_ptr());
}
}
}
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