Struct cranelift_codegen::machinst::lower::Lower

pub struct Lower<'func, I: VCodeInst> { /* fields omitted */ }

Machine-independent lowering driver / machine-instruction container. Maintains a correspondence from original Inst to MachInsts.

Methods

impl<'func, I: VCodeInst> Lower<'func, I>

pub fn new(
    f: &'func Function,
    abi: Box<dyn ABIBody<I = I>>
) -> CodegenResult<Lower<'func, I>>

Prepare a new lowering context for the given IR function.

pub fn lower<B: LowerBackend<MInst = I>>(
    self,
    backend: &B
) -> CodegenResult<VCode<I>>

Lower the function.

Trait Implementations

impl<'func, I: VCodeInst> LowerCtx for Lower<'func, I>

type I = I

The instruction type for which this lowering framework is instantiated.

fn data(&self, ir_inst: Inst) -> &InstructionData

Get the instdata for a given IR instruction.

fn ty(&self, ir_inst: Inst) -> Type

Get the controlling type for a polymorphic IR instruction.

fn abi(&mut self) -> &dyn ABIBody<I = I>

Get the ABIBody.

fn emit(&mut self, mach_inst: I)

Emit a machine instruction.

fn merged(&mut self, from_inst: Inst)

Indicate that a merge has occurred.

fn input_inst(&self, ir_inst: Inst, idx: usize) -> Option<(Inst, usize)>

Get the producing instruction, if any, and output number, for the idxth input to the given IR instruction.

fn value_to_writable_reg(&self, val: Value) -> Writable<Reg>

Map a Value to its associated writable (probably virtual) Reg.

fn value_to_reg(&self, val: Value) -> Reg

Map a Value to its associated (probably virtual) Reg.

fn input(&self, ir_inst: Inst, idx: usize) -> Reg

Get the idxth input to the given IR instruction as a virtual register.

fn output(&self, ir_inst: Inst, idx: usize) -> Writable<Reg>

Get the idxth output of the given IR instruction as a virtual register.

fn tmp(&mut self, rc: RegClass, ty: Type) -> Writable<Reg>

Get a new temp.

fn num_inputs(&self, ir_inst: Inst) -> usize

Get the number of inputs for the given IR instruction.

fn num_outputs(&self, ir_inst: Inst) -> usize

Get the number of outputs for the given IR instruction.

fn input_ty(&self, ir_inst: Inst, idx: usize) -> Type

Get the type for an instruction's input.

fn output_ty(&self, ir_inst: Inst, idx: usize) -> Type

Get the type for an instruction's output.

fn num_bb_params(&self, bb: Block) -> usize

Get the number of block params.

fn bb_param(&self, bb: Block, idx: usize) -> Reg

Get the register for a block param.

fn retval(&self, idx: usize) -> Writable<Reg>

Get the register for a return value.

fn call_target<'b>(&'b self, ir_inst: Inst) -> Option<&'b ExternalName>

Get the target for a call instruction, as an ExternalName.

fn call_sig<'b>(&'b self, ir_inst: Inst) -> Option<&'b Signature>

Get the signature for a call or call-indirect instruction.

fn symbol_value<'b>(&'b self, ir_inst: Inst) -> Option<(&'b ExternalName, i64)>

Get the symbol name and offset for a symbol_value instruction.

fn memflags(&self, ir_inst: Inst) -> Option<MemFlags>

Returns the memory flags of a given memory access.

fn srcloc(&self, ir_inst: Inst) -> SourceLoc

Get the source location for a given instruction.