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103 lines
4.9 KiB
Rust
103 lines
4.9 KiB
Rust
use rustc_middle::mir::{self, NonDivergingIntrinsic};
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use rustc_middle::span_bug;
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use rustc_session::config::OptLevel;
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use tracing::instrument;
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use super::FunctionCx;
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use super::LocalRef;
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use crate::traits::*;
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impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
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#[instrument(level = "debug", skip(self, bx))]
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pub fn codegen_statement(&mut self, bx: &mut Bx, statement: &mir::Statement<'tcx>) {
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self.set_debug_loc(bx, statement.source_info);
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match statement.kind {
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mir::StatementKind::Assign(box (ref place, ref rvalue)) => {
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if let Some(index) = place.as_local() {
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match self.locals[index] {
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LocalRef::Place(cg_dest) => self.codegen_rvalue(bx, cg_dest, rvalue),
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LocalRef::UnsizedPlace(cg_indirect_dest) => {
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self.codegen_rvalue_unsized(bx, cg_indirect_dest, rvalue)
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}
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LocalRef::PendingOperand => {
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let operand = self.codegen_rvalue_operand(bx, rvalue);
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self.overwrite_local(index, LocalRef::Operand(operand));
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self.debug_introduce_local(bx, index);
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}
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LocalRef::Operand(op) => {
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if !op.layout.is_zst() {
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span_bug!(
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statement.source_info.span,
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"operand {:?} already assigned",
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rvalue
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);
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}
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// If the type is zero-sized, it's already been set here,
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// but we still need to make sure we codegen the operand
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self.codegen_rvalue_operand(bx, rvalue);
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}
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}
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} else {
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let cg_dest = self.codegen_place(bx, place.as_ref());
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self.codegen_rvalue(bx, cg_dest, rvalue);
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}
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}
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mir::StatementKind::SetDiscriminant { box ref place, variant_index } => {
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self.codegen_place(bx, place.as_ref()).codegen_set_discr(bx, variant_index);
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}
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mir::StatementKind::Deinit(..) => {
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// For now, don't codegen this to anything. In the future it may be worth
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// experimenting with what kind of information we can emit to LLVM without hurting
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// perf here
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}
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mir::StatementKind::StorageLive(local) => {
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if let LocalRef::Place(cg_place) = self.locals[local] {
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cg_place.storage_live(bx);
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} else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
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cg_indirect_place.storage_live(bx);
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}
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}
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mir::StatementKind::StorageDead(local) => {
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if let LocalRef::Place(cg_place) = self.locals[local] {
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cg_place.storage_dead(bx);
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} else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
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cg_indirect_place.storage_dead(bx);
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}
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}
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mir::StatementKind::Coverage(ref kind) => {
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self.codegen_coverage(bx, kind, statement.source_info.scope);
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}
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mir::StatementKind::Intrinsic(box NonDivergingIntrinsic::Assume(ref op)) => {
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if !matches!(bx.tcx().sess.opts.optimize, OptLevel::No | OptLevel::Less) {
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let op_val = self.codegen_operand(bx, op);
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bx.assume(op_val.immediate());
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}
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}
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mir::StatementKind::Intrinsic(box NonDivergingIntrinsic::CopyNonOverlapping(
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mir::CopyNonOverlapping { ref count, ref src, ref dst },
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)) => {
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let dst_val = self.codegen_operand(bx, dst);
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let src_val = self.codegen_operand(bx, src);
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let count = self.codegen_operand(bx, count).immediate();
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let pointee_layout = dst_val
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.layout
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.pointee_info_at(bx, rustc_target::abi::Size::ZERO)
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.expect("Expected pointer");
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let bytes = bx.mul(count, bx.const_usize(pointee_layout.size.bytes()));
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let align = pointee_layout.align;
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let dst = dst_val.immediate();
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let src = src_val.immediate();
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bx.memcpy(dst, align, src, align, bytes, crate::MemFlags::empty());
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}
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mir::StatementKind::FakeRead(..)
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| mir::StatementKind::Retag { .. }
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| mir::StatementKind::AscribeUserType(..)
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| mir::StatementKind::ConstEvalCounter
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| mir::StatementKind::PlaceMention(..)
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| mir::StatementKind::Nop => {}
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}
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}
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}
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