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