Add a MIR visitor that allows to mutate the visited data
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Michael Woerister
parent
bd1ce30ccb
commit
8eee116cb8
@ -280,3 +280,277 @@ pub enum LvalueContext {
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// Consumed as part of an operand
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Consume,
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}
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pub trait MutVisitor<'tcx> {
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// Override these, and call `self.super_xxx` to revert back to the
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// default behavior.
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fn visit_mir(&mut self, mir: &mut Mir<'tcx>) {
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self.super_mir(mir);
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}
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fn visit_basic_block_data(&mut self,
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block: BasicBlock,
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data: &mut BasicBlockData<'tcx>) {
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self.super_basic_block_data(block, data);
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}
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fn visit_statement(&mut self,
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block: BasicBlock,
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statement: &mut Statement<'tcx>) {
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self.super_statement(block, statement);
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}
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fn visit_assign(&mut self,
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block: BasicBlock,
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lvalue: &mut Lvalue<'tcx>,
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rvalue: &mut Rvalue<'tcx>) {
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self.super_assign(block, lvalue, rvalue);
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}
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fn visit_terminator(&mut self,
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block: BasicBlock,
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terminator: &mut Terminator<'tcx>) {
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self.super_terminator(block, terminator);
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}
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fn visit_rvalue(&mut self, rvalue: &mut Rvalue<'tcx>) {
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self.super_rvalue(rvalue);
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}
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fn visit_operand(&mut self, operand: &mut Operand<'tcx>) {
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self.super_operand(operand);
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}
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fn visit_lvalue(&mut self,
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lvalue: &mut Lvalue<'tcx>,
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context: LvalueContext) {
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self.super_lvalue(lvalue, context);
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}
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fn visit_branch(&mut self, source: BasicBlock, target: BasicBlock) {
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self.super_branch(source, target);
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}
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fn visit_constant(&mut self, constant: &mut Constant<'tcx>) {
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self.super_constant(constant);
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}
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fn visit_literal(&mut self, literal: &mut Literal<'tcx>) {
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self.super_literal(literal);
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}
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fn visit_def_id(&mut self, def_id: &mut DefId) {
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self.super_def_id(def_id);
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}
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fn visit_span(&mut self, span: &mut Span) {
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self.super_span(span);
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}
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// The `super_xxx` methods comprise the default behavior and are
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// not meant to be overidden.
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fn super_mir(&mut self, mir: &mut Mir<'tcx>) {
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for block in mir.all_basic_blocks() {
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let data = mir.basic_block_data_mut(block);
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self.visit_basic_block_data(block, data);
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}
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}
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fn super_basic_block_data(&mut self,
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block: BasicBlock,
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data: &mut BasicBlockData<'tcx>) {
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for statement in &mut data.statements {
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self.visit_statement(block, statement);
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}
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self.visit_terminator(block, &mut data.terminator);
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}
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fn super_statement(&mut self,
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block: BasicBlock,
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statement: &mut Statement<'tcx>) {
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self.visit_span(&mut statement.span);
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match statement.kind {
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StatementKind::Assign(ref mut lvalue, ref mut rvalue) => {
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self.visit_assign(block, lvalue, rvalue);
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}
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StatementKind::Drop(_, ref mut lvalue) => {
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self.visit_lvalue(lvalue, LvalueContext::Drop);
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}
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}
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}
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fn super_assign(&mut self,
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_block: BasicBlock,
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lvalue: &mut Lvalue<'tcx>,
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rvalue: &mut Rvalue<'tcx>) {
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self.visit_lvalue(lvalue, LvalueContext::Store);
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self.visit_rvalue(rvalue);
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}
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fn super_terminator(&mut self,
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block: BasicBlock,
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terminator: &mut Terminator<'tcx>) {
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match *terminator {
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Terminator::Goto { target } |
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Terminator::Panic { target } => {
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self.visit_branch(block, target);
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}
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Terminator::If { ref mut cond, ref mut targets } => {
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self.visit_operand(cond);
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for &target in targets.as_slice() {
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self.visit_branch(block, target);
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}
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}
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Terminator::Switch { ref mut discr, adt_def: _, ref targets } => {
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self.visit_lvalue(discr, LvalueContext::Inspect);
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for &target in targets {
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self.visit_branch(block, target);
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}
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}
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Terminator::SwitchInt { ref mut discr, switch_ty: _, values: _, ref targets } => {
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self.visit_lvalue(discr, LvalueContext::Inspect);
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for &target in targets {
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self.visit_branch(block, target);
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}
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}
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Terminator::Diverge |
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Terminator::Return => {
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}
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Terminator::Call { ref mut data, ref mut targets } => {
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self.visit_lvalue(&mut data.destination, LvalueContext::Store);
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self.visit_operand(&mut data.func);
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for arg in &mut data.args {
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self.visit_operand(arg);
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}
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for &target in targets.as_slice() {
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self.visit_branch(block, target);
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}
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}
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}
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}
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fn super_rvalue(&mut self, rvalue: &mut Rvalue<'tcx>) {
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match *rvalue {
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Rvalue::Use(ref mut operand) => {
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self.visit_operand(operand);
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}
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Rvalue::Repeat(ref mut value, ref mut len) => {
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self.visit_operand(value);
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self.visit_constant(len);
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}
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Rvalue::Ref(r, bk, ref mut path) => {
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self.visit_lvalue(path, LvalueContext::Borrow {
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region: r,
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kind: bk
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});
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}
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Rvalue::Len(ref mut path) => {
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self.visit_lvalue(path, LvalueContext::Inspect);
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}
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Rvalue::Cast(_, ref mut operand, _) => {
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self.visit_operand(operand);
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}
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Rvalue::BinaryOp(_, ref mut lhs, ref mut rhs) => {
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self.visit_operand(lhs);
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self.visit_operand(rhs);
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}
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Rvalue::UnaryOp(_, ref mut op) => {
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self.visit_operand(op);
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}
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Rvalue::Box(_) => {
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}
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Rvalue::Aggregate(ref mut kind, ref mut operands) => {
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match *kind {
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AggregateKind::Closure(ref mut def_id, _) => {
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self.visit_def_id(def_id);
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}
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_ => { /* nothing to do */ }
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}
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for operand in &mut operands[..] {
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self.visit_operand(operand);
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}
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}
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Rvalue::Slice { ref mut input, from_start, from_end } => {
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self.visit_lvalue(input, LvalueContext::Slice {
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from_start: from_start,
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from_end: from_end,
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});
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}
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Rvalue::InlineAsm(_) => {
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}
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}
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}
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fn super_operand(&mut self, operand: &mut Operand<'tcx>) {
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match *operand {
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Operand::Consume(ref mut lvalue) => {
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self.visit_lvalue(lvalue, LvalueContext::Consume);
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}
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Operand::Constant(ref mut constant) => {
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self.visit_constant(constant);
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}
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}
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}
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fn super_lvalue(&mut self,
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lvalue: &mut Lvalue<'tcx>,
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_context: LvalueContext) {
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match *lvalue {
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Lvalue::Var(_) |
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Lvalue::Temp(_) |
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Lvalue::Arg(_) |
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Lvalue::ReturnPointer => {
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}
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Lvalue::Static(ref mut def_id) => {
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self.visit_def_id(def_id);
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}
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Lvalue::Projection(ref mut proj) => {
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self.visit_lvalue(&mut proj.base, LvalueContext::Projection);
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}
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}
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}
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fn super_branch(&mut self, _source: BasicBlock, _target: BasicBlock) {
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}
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fn super_constant(&mut self, constant: &mut Constant<'tcx>) {
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self.visit_span(&mut constant.span);
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self.visit_literal(&mut constant.literal);
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}
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fn super_literal(&mut self, literal: &mut Literal<'tcx>) {
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match *literal {
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Literal::Item { ref mut def_id, .. } => {
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self.visit_def_id(def_id);
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},
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Literal::Value { .. } => {
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// Nothing to do
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}
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}
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}
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fn super_def_id(&mut self, _def_id: &mut DefId) {
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}
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fn super_span(&mut self, _span: &mut Span) {
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}
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}
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