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|
use rustc_middle::mir;
use super::FunctionCx;
use super::LocalRef;
use crate::traits::BuilderMethods;
use crate::traits::*;
impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
#[instrument(level = "debug", skip(self, bx))]
pub fn codegen_statement(&mut self, mut bx: Bx, statement: &mir::Statement<'tcx>) -> Bx {
self.set_debug_loc(&mut bx, statement.source_info);
match statement.kind {
mir::StatementKind::Assign(box (ref place, ref rvalue)) => {
if let Some(index) = place.as_local() {
match self.locals[index] {
LocalRef::Place(cg_dest) => self.codegen_rvalue(bx, cg_dest, rvalue),
LocalRef::UnsizedPlace(cg_indirect_dest) => {
self.codegen_rvalue_unsized(bx, cg_indirect_dest, rvalue)
}
LocalRef::Operand(None) => {
let (mut bx, operand) = self.codegen_rvalue_operand(bx, rvalue);
self.locals[index] = LocalRef::Operand(Some(operand));
self.debug_introduce_local(&mut bx, index);
bx
}
LocalRef::Operand(Some(op)) => {
if !op.layout.is_zst() {
span_bug!(
statement.source_info.span,
"operand {:?} already assigned",
rvalue
);
}
// If the type is zero-sized, it's already been set here,
// but we still need to make sure we codegen the operand
self.codegen_rvalue_operand(bx, rvalue).0
}
}
} else {
let cg_dest = self.codegen_place(&mut bx, place.as_ref());
self.codegen_rvalue(bx, cg_dest, rvalue)
}
}
mir::StatementKind::SetDiscriminant { box ref place, variant_index } => {
self.codegen_place(&mut bx, place.as_ref())
.codegen_set_discr(&mut bx, variant_index);
bx
}
mir::StatementKind::Deinit(..) => {
// For now, don't codegen this to anything. In the future it may be worth
// experimenting with what kind of information we can emit to LLVM without hurting
// perf here
bx
}
mir::StatementKind::StorageLive(local) => {
if let LocalRef::Place(cg_place) = self.locals[local] {
cg_place.storage_live(&mut bx);
} else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
cg_indirect_place.storage_live(&mut bx);
}
bx
}
mir::StatementKind::StorageDead(local) => {
if let LocalRef::Place(cg_place) = self.locals[local] {
cg_place.storage_dead(&mut bx);
} else if let LocalRef::UnsizedPlace(cg_indirect_place) = self.locals[local] {
cg_indirect_place.storage_dead(&mut bx);
}
bx
}
mir::StatementKind::Coverage(box ref coverage) => {
self.codegen_coverage(&mut bx, coverage.clone(), statement.source_info.scope);
bx
}
mir::StatementKind::CopyNonOverlapping(box mir::CopyNonOverlapping {
ref src,
ref dst,
ref count,
}) => {
let dst_val = self.codegen_operand(&mut bx, dst);
let src_val = self.codegen_operand(&mut bx, src);
let count = self.codegen_operand(&mut bx, count).immediate();
let pointee_layout = dst_val
.layout
.pointee_info_at(&bx, rustc_target::abi::Size::ZERO)
.expect("Expected pointer");
let bytes = bx.mul(count, bx.const_usize(pointee_layout.size.bytes()));
let align = pointee_layout.align;
let dst = dst_val.immediate();
let src = src_val.immediate();
bx.memcpy(dst, align, src, align, bytes, crate::MemFlags::empty());
bx
}
mir::StatementKind::FakeRead(..)
| mir::StatementKind::Retag { .. }
| mir::StatementKind::AscribeUserType(..)
| mir::StatementKind::Nop => bx,
}
}
}
|
