| use crate::llvm; |
| use crate::context::CodegenCx; |
| use crate::type_of::LayoutLlvmExt; |
| use crate::builder::Builder; |
| use crate::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()); |
| } |
| } |
| } |