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|
use crate::base;
use crate::common;
use crate::traits::*;
use rustc_hir as hir;
use rustc_middle::mir::mono::MonoItem;
use rustc_middle::mir::mono::{Linkage, Visibility};
use rustc_middle::ty;
use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
use rustc_middle::ty::Instance;
pub trait MonoItemExt<'a, 'tcx> {
fn define<Bx: BuilderMethods<'a, 'tcx>>(&self, cx: &'a Bx::CodegenCx);
fn predefine<Bx: BuilderMethods<'a, 'tcx>>(
&self,
cx: &'a Bx::CodegenCx,
linkage: Linkage,
visibility: Visibility,
);
fn to_raw_string(&self) -> String;
}
impl<'a, 'tcx: 'a> MonoItemExt<'a, 'tcx> for MonoItem<'tcx> {
fn define<Bx: BuilderMethods<'a, 'tcx>>(&self, cx: &'a Bx::CodegenCx) {
debug!(
"BEGIN IMPLEMENTING '{} ({})' in cgu {}",
self,
self.to_raw_string(),
cx.codegen_unit().name()
);
match *self {
MonoItem::Static(def_id) => {
cx.codegen_static(def_id, cx.tcx().is_mutable_static(def_id));
}
MonoItem::GlobalAsm(item_id) => {
let item = cx.tcx().hir().item(item_id);
if let hir::ItemKind::GlobalAsm(ref asm) = item.kind {
let operands: Vec<_> = asm
.operands
.iter()
.map(|(op, op_sp)| match *op {
hir::InlineAsmOperand::Const { ref anon_const } => {
let anon_const_def_id =
cx.tcx().hir().local_def_id(anon_const.hir_id).to_def_id();
let const_value =
cx.tcx().const_eval_poly(anon_const_def_id).unwrap_or_else(
|_| span_bug!(*op_sp, "asm const cannot be resolved"),
);
let ty = cx
.tcx()
.typeck_body(anon_const.body)
.node_type(anon_const.hir_id);
let string = common::asm_const_to_str(
cx.tcx(),
*op_sp,
const_value,
cx.layout_of(ty),
);
GlobalAsmOperandRef::Const { string }
}
hir::InlineAsmOperand::SymFn { ref anon_const } => {
let ty = cx
.tcx()
.typeck_body(anon_const.body)
.node_type(anon_const.hir_id);
let instance = match ty.kind() {
&ty::FnDef(def_id, substs) => Instance::new(def_id, substs),
_ => span_bug!(*op_sp, "asm sym is not a function"),
};
GlobalAsmOperandRef::SymFn { instance }
}
hir::InlineAsmOperand::SymStatic { path: _, def_id } => {
GlobalAsmOperandRef::SymStatic { def_id }
}
hir::InlineAsmOperand::In { .. }
| hir::InlineAsmOperand::Out { .. }
| hir::InlineAsmOperand::InOut { .. }
| hir::InlineAsmOperand::SplitInOut { .. } => {
span_bug!(*op_sp, "invalid operand type for global_asm!")
}
})
.collect();
cx.codegen_global_asm(asm.template, &operands, asm.options, asm.line_spans);
} else {
span_bug!(item.span, "Mismatch between hir::Item type and MonoItem type")
}
}
MonoItem::Fn(instance) => {
base::codegen_instance::<Bx>(&cx, instance);
}
}
debug!(
"END IMPLEMENTING '{} ({})' in cgu {}",
self,
self.to_raw_string(),
cx.codegen_unit().name()
);
}
fn predefine<Bx: BuilderMethods<'a, 'tcx>>(
&self,
cx: &'a Bx::CodegenCx,
linkage: Linkage,
visibility: Visibility,
) {
debug!(
"BEGIN PREDEFINING '{} ({})' in cgu {}",
self,
self.to_raw_string(),
cx.codegen_unit().name()
);
let symbol_name = self.symbol_name(cx.tcx()).name;
debug!("symbol {}", &symbol_name);
match *self {
MonoItem::Static(def_id) => {
cx.predefine_static(def_id, linkage, visibility, &symbol_name);
}
MonoItem::Fn(instance) => {
cx.predefine_fn(instance, linkage, visibility, &symbol_name);
}
MonoItem::GlobalAsm(..) => {}
}
debug!(
"END PREDEFINING '{} ({})' in cgu {}",
self,
self.to_raw_string(),
cx.codegen_unit().name()
);
}
fn to_raw_string(&self) -> String {
match *self {
MonoItem::Fn(instance) => {
format!("Fn({:?}, {})", instance.def, instance.substs.as_ptr().addr())
}
MonoItem::Static(id) => format!("Static({:?})", id),
MonoItem::GlobalAsm(id) => format!("GlobalAsm({:?})", id),
}
}
}
|
