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//! Routines for manipulating the control-flow graph.
use crate::build::CFG;
use rustc_middle::mir::*;
use rustc_middle::ty::TyCtxt;
impl<'tcx> CFG<'tcx> {
pub(crate) fn block_data(&self, blk: BasicBlock) -> &BasicBlockData<'tcx> {
&self.basic_blocks[blk]
}
pub(crate) fn block_data_mut(&mut self, blk: BasicBlock) -> &mut BasicBlockData<'tcx> {
&mut self.basic_blocks[blk]
}
// llvm.org/PR32488 makes this function use an excess of stack space. Mark
// it as #[inline(never)] to keep rustc's stack use in check.
#[inline(never)]
pub(crate) fn start_new_block(&mut self) -> BasicBlock {
self.basic_blocks.push(BasicBlockData::new(None))
}
pub(crate) fn start_new_cleanup_block(&mut self) -> BasicBlock {
let bb = self.start_new_block();
self.block_data_mut(bb).is_cleanup = true;
bb
}
pub(crate) fn push(&mut self, block: BasicBlock, statement: Statement<'tcx>) {
debug!("push({:?}, {:?})", block, statement);
self.block_data_mut(block).statements.push(statement);
}
pub(crate) fn push_assign(
&mut self,
block: BasicBlock,
source_info: SourceInfo,
place: Place<'tcx>,
rvalue: Rvalue<'tcx>,
) {
self.push(
block,
Statement { source_info, kind: StatementKind::Assign(Box::new((place, rvalue))) },
);
}
pub(crate) fn push_assign_constant(
&mut self,
block: BasicBlock,
source_info: SourceInfo,
temp: Place<'tcx>,
constant: Constant<'tcx>,
) {
self.push_assign(
block,
source_info,
temp,
Rvalue::Use(Operand::Constant(Box::new(constant))),
);
}
pub(crate) fn push_assign_unit(
&mut self,
block: BasicBlock,
source_info: SourceInfo,
place: Place<'tcx>,
tcx: TyCtxt<'tcx>,
) {
self.push_assign(
block,
source_info,
place,
Rvalue::Use(Operand::Constant(Box::new(Constant {
span: source_info.span,
user_ty: None,
literal: ConstantKind::zero_sized(tcx.types.unit),
}))),
);
}
pub(crate) fn push_fake_read(
&mut self,
block: BasicBlock,
source_info: SourceInfo,
cause: FakeReadCause,
place: Place<'tcx>,
) {
let kind = StatementKind::FakeRead(Box::new((cause, place)));
let stmt = Statement { source_info, kind };
self.push(block, stmt);
}
pub(crate) fn terminate(
&mut self,
block: BasicBlock,
source_info: SourceInfo,
kind: TerminatorKind<'tcx>,
) {
debug!("terminating block {:?} <- {:?}", block, kind);
debug_assert!(
self.block_data(block).terminator.is_none(),
"terminate: block {:?}={:?} already has a terminator set",
block,
self.block_data(block)
);
self.block_data_mut(block).terminator = Some(Terminator { source_info, kind });
}
/// In the `origin` block, push a `goto -> target` terminator.
pub(crate) fn goto(&mut self, origin: BasicBlock, source_info: SourceInfo, target: BasicBlock) {
self.terminate(origin, source_info, TerminatorKind::Goto { target })
}
}
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