1280 lines
45 KiB
Rust
1280 lines
45 KiB
Rust
//! A frontend for building Cranelift IR from other languages.
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use crate::ssa::{Block, SSABuilder, SideEffects};
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use crate::variable::Variable;
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use cranelift_codegen::cursor::{Cursor, FuncCursor};
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use cranelift_codegen::entity::{EntitySet, SecondaryMap};
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use cranelift_codegen::ir;
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use cranelift_codegen::ir::function::DisplayFunction;
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use cranelift_codegen::ir::{
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types, AbiParam, DataFlowGraph, Ebb, ExtFuncData, ExternalName, FuncRef, Function, GlobalValue,
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GlobalValueData, Heap, HeapData, Inst, InstBuilder, InstBuilderBase, InstructionData,
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JumpTable, JumpTableData, LibCall, MemFlags, SigRef, Signature, StackSlot, StackSlotData, Type,
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Value, ValueLabel, ValueLabelAssignments, ValueLabelStart,
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};
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use cranelift_codegen::isa::{TargetFrontendConfig, TargetIsa};
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use cranelift_codegen::packed_option::PackedOption;
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use std::vec::Vec;
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/// Structure used for translating a series of functions into Cranelift IR.
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///
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/// In order to reduce memory reallocations when compiling multiple functions,
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/// `FunctionBuilderContext` holds various data structures which are cleared between
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/// functions, rather than dropped, preserving the underlying allocations.
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pub struct FunctionBuilderContext {
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ssa: SSABuilder,
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ebbs: SecondaryMap<Ebb, EbbData>,
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types: SecondaryMap<Variable, Type>,
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}
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/// Temporary object used to build a single Cranelift IR `Function`.
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pub struct FunctionBuilder<'a> {
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/// The function currently being built.
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/// This field is public so the function can be re-borrowed.
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pub func: &'a mut Function,
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/// Source location to assign to all new instructions.
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srcloc: ir::SourceLoc,
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func_ctx: &'a mut FunctionBuilderContext,
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position: Position,
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}
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#[derive(Clone, Default)]
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struct EbbData {
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filled: bool,
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pristine: bool,
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user_param_count: usize,
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}
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struct Position {
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ebb: PackedOption<Ebb>,
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basic_block: PackedOption<Block>,
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}
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impl Position {
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fn at(ebb: Ebb, basic_block: Block) -> Self {
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Self {
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ebb: PackedOption::from(ebb),
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basic_block: PackedOption::from(basic_block),
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}
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}
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fn default() -> Self {
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Self {
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ebb: PackedOption::default(),
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basic_block: PackedOption::default(),
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}
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}
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fn is_default(&self) -> bool {
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self.ebb.is_none() && self.basic_block.is_none()
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}
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}
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impl FunctionBuilderContext {
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/// Creates a FunctionBuilderContext structure. The structure is automatically cleared after
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/// each [`FunctionBuilder`](struct.FunctionBuilder.html) completes translating a function.
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pub fn new() -> Self {
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Self {
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ssa: SSABuilder::new(),
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ebbs: SecondaryMap::new(),
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types: SecondaryMap::new(),
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}
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}
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fn clear(&mut self) {
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self.ssa.clear();
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self.ebbs.clear();
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self.types.clear();
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}
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fn is_empty(&self) -> bool {
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self.ssa.is_empty() && self.ebbs.is_empty() && self.types.is_empty()
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}
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}
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/// Implementation of the [`InstBuilder`](../codegen/ir/builder/trait.InstBuilder.html) that has
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/// one convenience method per Cranelift IR instruction.
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pub struct FuncInstBuilder<'short, 'long: 'short> {
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builder: &'short mut FunctionBuilder<'long>,
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ebb: Ebb,
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}
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impl<'short, 'long> FuncInstBuilder<'short, 'long> {
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fn new(builder: &'short mut FunctionBuilder<'long>, ebb: Ebb) -> Self {
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Self { builder, ebb }
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}
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}
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impl<'short, 'long> InstBuilderBase<'short> for FuncInstBuilder<'short, 'long> {
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fn data_flow_graph(&self) -> &DataFlowGraph {
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&self.builder.func.dfg
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}
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fn data_flow_graph_mut(&mut self) -> &mut DataFlowGraph {
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&mut self.builder.func.dfg
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}
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// This implementation is richer than `InsertBuilder` because we use the data of the
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// instruction being inserted to add related info to the DFG and the SSA building system,
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// and perform debug sanity checks.
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fn build(self, data: InstructionData, ctrl_typevar: Type) -> (Inst, &'short mut DataFlowGraph) {
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// We only insert the Ebb in the layout when an instruction is added to it
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self.builder.ensure_inserted_ebb();
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let inst = self.builder.func.dfg.make_inst(data.clone());
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self.builder.func.dfg.make_inst_results(inst, ctrl_typevar);
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self.builder.func.layout.append_inst(inst, self.ebb);
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if !self.builder.srcloc.is_default() {
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self.builder.func.srclocs[inst] = self.builder.srcloc;
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}
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if data.opcode().is_branch() {
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match data.branch_destination() {
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Some(dest_ebb) => {
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// If the user has supplied jump arguments we must adapt the arguments of
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// the destination ebb
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self.builder.declare_successor(dest_ebb, inst);
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}
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None => {
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// branch_destination() doesn't detect jump_tables
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// If jump table we declare all entries successor
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if let InstructionData::BranchTable {
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table, destination, ..
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} = data
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{
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// Unlike all other jumps/branches, jump tables are
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// capable of having the same successor appear
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// multiple times, so we must deduplicate.
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let mut unique = EntitySet::<Ebb>::new();
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for dest_ebb in self
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.builder
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.func
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.jump_tables
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.get(table)
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.expect("you are referencing an undeclared jump table")
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.iter()
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.filter(|&dest_ebb| unique.insert(*dest_ebb))
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{
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self.builder.func_ctx.ssa.declare_ebb_predecessor(
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*dest_ebb,
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self.builder.position.basic_block.unwrap(),
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inst,
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);
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}
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self.builder.func_ctx.ssa.declare_ebb_predecessor(
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destination,
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self.builder.position.basic_block.unwrap(),
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inst,
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);
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}
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}
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}
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}
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if data.opcode().is_terminator() {
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self.builder.fill_current_block()
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} else if data.opcode().is_branch() {
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self.builder.move_to_next_basic_block()
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}
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(inst, &mut self.builder.func.dfg)
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}
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}
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/// This module allows you to create a function in Cranelift IR in a straightforward way, hiding
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/// all the complexity of its internal representation.
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///
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/// The module is parametrized by one type which is the representation of variables in your
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/// origin language. It offers a way to conveniently append instruction to your program flow.
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/// You are responsible to split your instruction flow into extended blocks (declared with
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/// `create_ebb`) whose properties are:
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///
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/// - branch and jump instructions can only point at the top of extended blocks;
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/// - the last instruction of each block is a terminator instruction which has no natural successor,
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/// and those instructions can only appear at the end of extended blocks.
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///
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/// The parameters of Cranelift IR instructions are Cranelift IR values, which can only be created
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/// as results of other Cranelift IR instructions. To be able to create variables redefined multiple
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/// times in your program, use the `def_var` and `use_var` command, that will maintain the
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/// correspondence between your variables and Cranelift IR SSA values.
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///
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/// The first block for which you call `switch_to_block` will be assumed to be the beginning of
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/// the function.
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///
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/// At creation, a `FunctionBuilder` instance borrows an already allocated `Function` which it
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/// modifies with the information stored in the mutable borrowed
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/// [`FunctionBuilderContext`](struct.FunctionBuilderContext.html). The function passed in
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/// argument should be newly created with
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/// [`Function::with_name_signature()`](../function/struct.Function.html), whereas the
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/// `FunctionBuilderContext` can be kept as is between two function translations.
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///
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/// # Errors
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///
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/// The functions below will panic in debug mode whenever you try to modify the Cranelift IR
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/// function in a way that violate the coherence of the code. For instance: switching to a new
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/// `Ebb` when you haven't filled the current one with a terminator instruction, inserting a
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/// return instruction with arguments that don't match the function's signature.
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impl<'a> FunctionBuilder<'a> {
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/// Creates a new FunctionBuilder structure that will operate on a `Function` using a
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/// `FunctionBuilderContext`.
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pub fn new(func: &'a mut Function, func_ctx: &'a mut FunctionBuilderContext) -> Self {
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debug_assert!(func_ctx.is_empty());
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Self {
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func,
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srcloc: Default::default(),
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func_ctx,
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position: Position::default(),
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}
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}
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/// Set the source location that should be assigned to all new instructions.
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pub fn set_srcloc(&mut self, srcloc: ir::SourceLoc) {
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self.srcloc = srcloc;
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}
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/// Creates a new `Ebb` and returns its reference.
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pub fn create_ebb(&mut self) -> Ebb {
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let ebb = self.func.dfg.make_ebb();
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self.func_ctx.ssa.declare_ebb_header_block(ebb);
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self.func_ctx.ebbs[ebb] = EbbData {
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filled: false,
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pristine: true,
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user_param_count: 0,
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};
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ebb
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}
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/// After the call to this function, new instructions will be inserted into the designated
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/// block, in the order they are declared. You must declare the types of the Ebb arguments
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/// you will use here.
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///
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/// When inserting the terminator instruction (which doesn't have a fallthrough to its immediate
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/// successor), the block will be declared filled and it will not be possible to append
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/// instructions to it.
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pub fn switch_to_block(&mut self, ebb: Ebb) {
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// First we check that the previous block has been filled.
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debug_assert!(
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self.position.is_default()
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|| self.is_unreachable()
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|| self.is_pristine()
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|| self.is_filled(),
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"you have to fill your block before switching"
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);
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// We cannot switch to a filled block
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debug_assert!(
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!self.func_ctx.ebbs[ebb].filled,
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"you cannot switch to a block which is already filled"
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);
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let basic_block = self.func_ctx.ssa.header_block(ebb);
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// Then we change the cursor position.
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self.position = Position::at(ebb, basic_block);
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}
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/// Declares that all the predecessors of this block are known.
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///
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/// Function to call with `ebb` as soon as the last branch instruction to `ebb` has been
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/// created. Forgetting to call this method on every block will cause inconsistencies in the
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/// produced functions.
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pub fn seal_block(&mut self, ebb: Ebb) {
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let side_effects = self.func_ctx.ssa.seal_ebb_header_block(ebb, self.func);
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self.handle_ssa_side_effects(side_effects);
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}
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/// Effectively calls seal_block on all blocks in the function.
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///
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/// It's more efficient to seal `Ebb`s as soon as possible, during
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/// translation, but for frontends where this is impractical to do, this
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/// function can be used at the end of translating all blocks to ensure
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/// that everything is sealed.
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pub fn seal_all_blocks(&mut self) {
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let side_effects = self.func_ctx.ssa.seal_all_ebb_header_blocks(self.func);
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self.handle_ssa_side_effects(side_effects);
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}
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/// In order to use a variable in a `use_var`, you need to declare its type with this method.
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pub fn declare_var(&mut self, var: Variable, ty: Type) {
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self.func_ctx.types[var] = ty;
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}
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/// Returns the Cranelift IR value corresponding to the utilization at the current program
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/// position of a previously defined user variable.
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pub fn use_var(&mut self, var: Variable) -> Value {
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let (val, side_effects) = {
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let ty = *self.func_ctx.types.get(var).unwrap_or_else(|| {
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panic!(
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"variable {:?} is used but its type has not been declared",
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var
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)
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});
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self.func_ctx
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.ssa
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.use_var(self.func, var, ty, self.position.basic_block.unwrap())
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};
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self.handle_ssa_side_effects(side_effects);
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val
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}
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/// Register a new definition of a user variable. The type of the value must be
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/// the same as the type registered for the variable.
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pub fn def_var(&mut self, var: Variable, val: Value) {
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debug_assert_eq!(
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*self.func_ctx.types.get(var).unwrap_or_else(|| panic!(
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"variable {:?} is used but its type has not been declared",
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var
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)),
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self.func.dfg.value_type(val),
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"declared type of variable {:?} doesn't match type of value {}",
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var,
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val
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);
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self.func_ctx
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.ssa
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.def_var(var, val, self.position.basic_block.unwrap());
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}
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/// Set label for Value
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pub fn set_val_label(&mut self, val: Value, label: ValueLabel) {
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if let Some(values_labels) = self.func.dfg.values_labels.as_mut() {
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use std::collections::hash_map::Entry;
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let start = ValueLabelStart {
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from: self.srcloc,
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label,
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};
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match values_labels.entry(val) {
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Entry::Occupied(mut e) => match e.get_mut() {
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ValueLabelAssignments::Starts(starts) => starts.push(start),
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_ => panic!("Unexpected ValueLabelAssignments at this stage"),
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},
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Entry::Vacant(e) => {
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e.insert(ValueLabelAssignments::Starts(vec![start]));
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}
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}
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}
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}
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/// Creates a jump table in the function, to be used by `br_table` instructions.
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pub fn create_jump_table(&mut self, data: JumpTableData) -> JumpTable {
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self.func.create_jump_table(data)
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}
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/// Creates a stack slot in the function, to be used by `stack_load`, `stack_store` and
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/// `stack_addr` instructions.
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pub fn create_stack_slot(&mut self, data: StackSlotData) -> StackSlot {
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self.func.create_stack_slot(data)
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}
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/// Adds a signature which can later be used to declare an external function import.
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pub fn import_signature(&mut self, signature: Signature) -> SigRef {
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self.func.import_signature(signature)
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}
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/// Declare an external function import.
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pub fn import_function(&mut self, data: ExtFuncData) -> FuncRef {
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self.func.import_function(data)
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}
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/// Declares a global value accessible to the function.
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pub fn create_global_value(&mut self, data: GlobalValueData) -> GlobalValue {
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self.func.create_global_value(data)
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}
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/// Declares a heap accessible to the function.
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pub fn create_heap(&mut self, data: HeapData) -> Heap {
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self.func.create_heap(data)
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}
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/// Returns an object with the [`InstBuilder`](../codegen/ir/builder/trait.InstBuilder.html)
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/// trait that allows to conveniently append an instruction to the current `Ebb` being built.
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pub fn ins<'short>(&'short mut self) -> FuncInstBuilder<'short, 'a> {
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let ebb = self
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.position
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.ebb
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.expect("Please call switch_to_block before inserting instructions");
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FuncInstBuilder::new(self, ebb)
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}
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/// Make sure that the current EBB is inserted in the layout.
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pub fn ensure_inserted_ebb(&mut self) {
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let ebb = self.position.ebb.unwrap();
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if self.func_ctx.ebbs[ebb].pristine {
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if !self.func.layout.is_ebb_inserted(ebb) {
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self.func.layout.append_ebb(ebb);
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}
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self.func_ctx.ebbs[ebb].pristine = false;
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} else {
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debug_assert!(
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!self.func_ctx.ebbs[ebb].filled,
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"you cannot add an instruction to a block already filled"
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);
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}
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}
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/// Returns a `FuncCursor` pointed at the current position ready for inserting instructions.
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///
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/// This can be used to insert SSA code that doesn't need to access locals and that doesn't
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/// need to know about `FunctionBuilder` at all.
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pub fn cursor(&mut self) -> FuncCursor {
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self.ensure_inserted_ebb();
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FuncCursor::new(self.func)
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.with_srcloc(self.srcloc)
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.at_bottom(self.position.ebb.unwrap())
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}
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/// Append parameters to the given `Ebb` corresponding to the function
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/// parameters. This can be used to set up the ebb parameters for the
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/// entry block.
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pub fn append_ebb_params_for_function_params(&mut self, ebb: Ebb) {
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debug_assert!(
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!self.func_ctx.ssa.has_any_predecessors(ebb),
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"ebb parameters for function parameters should only be added to the entry block"
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);
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// These parameters count as "user" parameters here because they aren't
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// inserted by the SSABuilder.
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let user_param_count = &mut self.func_ctx.ebbs[ebb].user_param_count;
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for argtyp in &self.func.signature.params {
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*user_param_count += 1;
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self.func.dfg.append_ebb_param(ebb, argtyp.value_type);
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}
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}
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/// Append parameters to the given `Ebb` corresponding to the function
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/// return values. This can be used to set up the ebb parameters for a
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/// function exit block.
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pub fn append_ebb_params_for_function_returns(&mut self, ebb: Ebb) {
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// These parameters count as "user" parameters here because they aren't
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// inserted by the SSABuilder.
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let user_param_count = &mut self.func_ctx.ebbs[ebb].user_param_count;
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for argtyp in &self.func.signature.returns {
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*user_param_count += 1;
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self.func.dfg.append_ebb_param(ebb, argtyp.value_type);
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}
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}
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|
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/// Declare that translation of the current function is complete. This
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/// resets the state of the `FunctionBuilder` in preparation to be used
|
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/// for another function.
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pub fn finalize(&mut self) {
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// Check that all the `Ebb`s are filled and sealed.
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|
debug_assert!(
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self.func_ctx
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.ebbs
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.iter()
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.all(|(ebb, ebb_data)| ebb_data.pristine || self.func_ctx.ssa.is_sealed(ebb)),
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"all blocks should be sealed before dropping a FunctionBuilder"
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);
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debug_assert!(
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self.func_ctx
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.ebbs
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.values()
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.all(|ebb_data| ebb_data.pristine || ebb_data.filled),
|
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"all blocks should be filled before dropping a FunctionBuilder"
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);
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|
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// Clear the state (but preserve the allocated buffers) in preparation
|
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// for translation another function.
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self.func_ctx.clear();
|
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|
|
// Reset srcloc and position to initial states.
|
|
self.srcloc = Default::default();
|
|
self.position = Position::default();
|
|
}
|
|
}
|
|
|
|
/// All the functions documented in the previous block are write-only and help you build a valid
|
|
/// Cranelift IR functions via multiple debug asserts. However, you might need to improve the
|
|
/// performance of your translation perform more complex transformations to your Cranelift IR
|
|
/// function. The functions below help you inspect the function you're creating and modify it
|
|
/// in ways that can be unsafe if used incorrectly.
|
|
impl<'a> FunctionBuilder<'a> {
|
|
/// Retrieves all the parameters for an `Ebb` currently inferred from the jump instructions
|
|
/// inserted that target it and the SSA construction.
|
|
pub fn ebb_params(&self, ebb: Ebb) -> &[Value] {
|
|
self.func.dfg.ebb_params(ebb)
|
|
}
|
|
|
|
/// Retrieves the signature with reference `sigref` previously added with `import_signature`.
|
|
pub fn signature(&self, sigref: SigRef) -> Option<&Signature> {
|
|
self.func.dfg.signatures.get(sigref)
|
|
}
|
|
|
|
/// Creates a parameter for a specific `Ebb` by appending it to the list of already existing
|
|
/// parameters.
|
|
///
|
|
/// **Note:** this function has to be called at the creation of the `Ebb` before adding
|
|
/// instructions to it, otherwise this could interfere with SSA construction.
|
|
pub fn append_ebb_param(&mut self, ebb: Ebb, ty: Type) -> Value {
|
|
debug_assert!(self.func_ctx.ebbs[ebb].pristine);
|
|
debug_assert_eq!(
|
|
self.func_ctx.ebbs[ebb].user_param_count,
|
|
self.func.dfg.num_ebb_params(ebb)
|
|
);
|
|
self.func_ctx.ebbs[ebb].user_param_count += 1;
|
|
self.func.dfg.append_ebb_param(ebb, ty)
|
|
}
|
|
|
|
/// Returns the result values of an instruction.
|
|
pub fn inst_results(&self, inst: Inst) -> &[Value] {
|
|
self.func.dfg.inst_results(inst)
|
|
}
|
|
|
|
/// Changes the destination of a jump instruction after creation.
|
|
///
|
|
/// **Note:** You are responsible for maintaining the coherence with the arguments of
|
|
/// other jump instructions.
|
|
pub fn change_jump_destination(&mut self, inst: Inst, new_dest: Ebb) {
|
|
let old_dest = self.func.dfg[inst]
|
|
.branch_destination_mut()
|
|
.expect("you want to change the jump destination of a non-jump instruction");
|
|
let pred = self.func_ctx.ssa.remove_ebb_predecessor(*old_dest, inst);
|
|
*old_dest = new_dest;
|
|
self.func_ctx
|
|
.ssa
|
|
.declare_ebb_predecessor(new_dest, pred, inst);
|
|
}
|
|
|
|
/// Returns `true` if and only if the current `Ebb` is sealed and has no predecessors declared.
|
|
///
|
|
/// The entry block of a function is never unreachable.
|
|
pub fn is_unreachable(&self) -> bool {
|
|
let is_entry = match self.func.layout.entry_block() {
|
|
None => false,
|
|
Some(entry) => self.position.ebb.unwrap() == entry,
|
|
};
|
|
!is_entry
|
|
&& self.func_ctx.ssa.is_sealed(self.position.ebb.unwrap())
|
|
&& !self
|
|
.func_ctx
|
|
.ssa
|
|
.has_any_predecessors(self.position.ebb.unwrap())
|
|
}
|
|
|
|
/// Returns `true` if and only if no instructions have been added since the last call to
|
|
/// `switch_to_block`.
|
|
pub fn is_pristine(&self) -> bool {
|
|
self.func_ctx.ebbs[self.position.ebb.unwrap()].pristine
|
|
}
|
|
|
|
/// Returns `true` if and only if a terminator instruction has been inserted since the
|
|
/// last call to `switch_to_block`.
|
|
pub fn is_filled(&self) -> bool {
|
|
self.func_ctx.ebbs[self.position.ebb.unwrap()].filled
|
|
}
|
|
|
|
/// Returns a displayable object for the function as it is.
|
|
///
|
|
/// Useful for debug purposes. Use it with `None` for standard printing.
|
|
// Clippy thinks the lifetime that follows is needless, but rustc needs it
|
|
#[cfg_attr(feature = "cargo-clippy", allow(clippy::needless_lifetimes))]
|
|
pub fn display<'b, I: Into<Option<&'b TargetIsa>>>(&'b self, isa: I) -> DisplayFunction {
|
|
self.func.display(isa)
|
|
}
|
|
}
|
|
|
|
/// Helper functions
|
|
impl<'a> FunctionBuilder<'a> {
|
|
/// Calls libc.memcpy
|
|
///
|
|
/// Copies the `size` bytes from `src` to `dest`, assumes that `src + size`
|
|
/// won't overlap onto `dest`. If `dest` and `src` overlap, the behavior is
|
|
/// undefined. Applications in which `dest` and `src` might overlap should
|
|
/// use `call_memmove` instead.
|
|
pub fn call_memcpy(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
src: Value,
|
|
size: Value,
|
|
) {
|
|
let pointer_type = config.pointer_type();
|
|
let signature = {
|
|
let mut s = Signature::new(config.default_call_conv);
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
self.import_signature(s)
|
|
};
|
|
|
|
let libc_memcpy = self.import_function(ExtFuncData {
|
|
name: ExternalName::LibCall(LibCall::Memcpy),
|
|
signature,
|
|
colocated: false,
|
|
});
|
|
|
|
self.ins().call(libc_memcpy, &[dest, src, size]);
|
|
}
|
|
|
|
/// Optimised memcpy for small copies.
|
|
pub fn emit_small_memcpy(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
src: Value,
|
|
size: u64,
|
|
dest_align: u8,
|
|
src_align: u8,
|
|
) {
|
|
// Currently the result of guess work, not actual profiling.
|
|
const THRESHOLD: u64 = 4;
|
|
|
|
if size == 0 {
|
|
return;
|
|
}
|
|
|
|
let access_size = greatest_divisible_power_of_two(size);
|
|
assert!(
|
|
access_size.is_power_of_two(),
|
|
"`size` is not a power of two"
|
|
);
|
|
assert!(
|
|
access_size >= u64::from(::core::cmp::min(src_align, dest_align)),
|
|
"`size` is smaller than `dest` and `src`'s alignment value."
|
|
);
|
|
|
|
let (access_size, int_type) = if access_size <= 8 {
|
|
(access_size, Type::int((access_size * 8) as u16).unwrap())
|
|
} else {
|
|
(8, types::I64)
|
|
};
|
|
|
|
let load_and_store_amount = size / access_size;
|
|
|
|
if load_and_store_amount > THRESHOLD {
|
|
let size_value = self.ins().iconst(config.pointer_type(), size as i64);
|
|
self.call_memcpy(config, dest, src, size_value);
|
|
return;
|
|
}
|
|
|
|
let mut flags = MemFlags::new();
|
|
flags.set_aligned();
|
|
|
|
for i in 0..load_and_store_amount {
|
|
let offset = (access_size * i) as i32;
|
|
let value = self.ins().load(int_type, flags, src, offset);
|
|
self.ins().store(flags, value, dest, offset);
|
|
}
|
|
}
|
|
|
|
/// Calls libc.memset
|
|
///
|
|
/// Writes `size` bytes of i8 value `ch` to memory starting at `buffer`.
|
|
pub fn call_memset(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
buffer: Value,
|
|
ch: Value,
|
|
size: Value,
|
|
) {
|
|
let pointer_type = config.pointer_type();
|
|
let signature = {
|
|
let mut s = Signature::new(config.default_call_conv);
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(types::I32));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
self.import_signature(s)
|
|
};
|
|
|
|
let libc_memset = self.import_function(ExtFuncData {
|
|
name: ExternalName::LibCall(LibCall::Memset),
|
|
signature,
|
|
colocated: false,
|
|
});
|
|
|
|
let ch = self.ins().uextend(types::I32, ch);
|
|
self.ins().call(libc_memset, &[buffer, ch, size]);
|
|
}
|
|
|
|
/// Calls libc.memset
|
|
///
|
|
/// Writes `size` bytes of value `ch` to memory starting at `buffer`.
|
|
pub fn emit_small_memset(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
buffer: Value,
|
|
ch: u8,
|
|
size: u64,
|
|
buffer_align: u8,
|
|
) {
|
|
// Currently the result of guess work, not actual profiling.
|
|
const THRESHOLD: u64 = 4;
|
|
|
|
if size == 0 {
|
|
return;
|
|
}
|
|
|
|
let access_size = greatest_divisible_power_of_two(size);
|
|
assert!(
|
|
access_size.is_power_of_two(),
|
|
"`size` is not a power of two"
|
|
);
|
|
assert!(
|
|
access_size >= u64::from(buffer_align),
|
|
"`size` is smaller than `dest` and `src`'s alignment value."
|
|
);
|
|
|
|
let (access_size, int_type) = if access_size <= 8 {
|
|
(access_size, Type::int((access_size * 8) as u16).unwrap())
|
|
} else {
|
|
(8, types::I64)
|
|
};
|
|
|
|
let load_and_store_amount = size / access_size;
|
|
|
|
if load_and_store_amount > THRESHOLD {
|
|
let ch = self.ins().iconst(types::I8, i64::from(ch));
|
|
let size = self.ins().iconst(config.pointer_type(), size as i64);
|
|
self.call_memset(config, buffer, ch, size);
|
|
} else {
|
|
let mut flags = MemFlags::new();
|
|
flags.set_aligned();
|
|
|
|
let ch = u64::from(ch);
|
|
let raw_value = if int_type == types::I64 {
|
|
(ch << 32) | (ch << 16) | (ch << 8) | ch
|
|
} else if int_type == types::I32 {
|
|
(ch << 16) | (ch << 8) | ch
|
|
} else if int_type == types::I16 {
|
|
(ch << 8) | ch
|
|
} else {
|
|
assert_eq!(int_type, types::I8);
|
|
ch
|
|
};
|
|
|
|
let value = self.ins().iconst(int_type, raw_value as i64);
|
|
for i in 0..load_and_store_amount {
|
|
let offset = (access_size * i) as i32;
|
|
self.ins().store(flags, value, buffer, offset);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Calls libc.memmove
|
|
///
|
|
/// Copies `size` bytes from memory starting at `source` to memory starting
|
|
/// at `dest`. `source` is always read before writing to `dest`.
|
|
pub fn call_memmove(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
source: Value,
|
|
size: Value,
|
|
) {
|
|
let pointer_type = config.pointer_type();
|
|
let signature = {
|
|
let mut s = Signature::new(config.default_call_conv);
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
s.params.push(AbiParam::new(pointer_type));
|
|
self.import_signature(s)
|
|
};
|
|
|
|
let libc_memmove = self.import_function(ExtFuncData {
|
|
name: ExternalName::LibCall(LibCall::Memmove),
|
|
signature,
|
|
colocated: false,
|
|
});
|
|
|
|
self.ins().call(libc_memmove, &[dest, source, size]);
|
|
}
|
|
|
|
/// Optimised memmove for small moves.
|
|
pub fn emit_small_memmove(
|
|
&mut self,
|
|
config: TargetFrontendConfig,
|
|
dest: Value,
|
|
src: Value,
|
|
size: u64,
|
|
dest_align: u8,
|
|
src_align: u8,
|
|
) {
|
|
// Currently the result of guess work, not actual profiling.
|
|
const THRESHOLD: u64 = 4;
|
|
|
|
let access_size = greatest_divisible_power_of_two(size);
|
|
assert!(
|
|
access_size.is_power_of_two(),
|
|
"`size` is not a power of two"
|
|
);
|
|
assert!(
|
|
access_size >= u64::from(::core::cmp::min(src_align, dest_align)),
|
|
"`size` is smaller than `dest` and `src`'s alignment value."
|
|
);
|
|
let load_and_store_amount = size / access_size;
|
|
|
|
if load_and_store_amount > THRESHOLD {
|
|
let size_value = self.ins().iconst(config.pointer_type(), size as i64);
|
|
self.call_memmove(config, dest, src, size_value);
|
|
return;
|
|
}
|
|
|
|
let mut flags = MemFlags::new();
|
|
flags.set_aligned();
|
|
|
|
// Load all of the memory first in case `dest` overlaps.
|
|
let registers: Vec<_> = (0..load_and_store_amount)
|
|
.map(|i| {
|
|
let offset = (access_size * i) as i32;
|
|
(
|
|
self.ins().load(config.pointer_type(), flags, src, offset),
|
|
offset,
|
|
)
|
|
})
|
|
.collect();
|
|
|
|
for (value, offset) in registers {
|
|
self.ins().store(flags, value, dest, offset);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn greatest_divisible_power_of_two(size: u64) -> u64 {
|
|
(size as i64 & -(size as i64)) as u64
|
|
}
|
|
|
|
// Helper functions
|
|
impl<'a> FunctionBuilder<'a> {
|
|
fn move_to_next_basic_block(&mut self) {
|
|
self.position.basic_block = PackedOption::from(
|
|
self.func_ctx
|
|
.ssa
|
|
.declare_ebb_body_block(self.position.basic_block.unwrap()),
|
|
);
|
|
}
|
|
|
|
fn fill_current_block(&mut self) {
|
|
self.func_ctx.ebbs[self.position.ebb.unwrap()].filled = true;
|
|
}
|
|
|
|
fn declare_successor(&mut self, dest_ebb: Ebb, jump_inst: Inst) {
|
|
self.func_ctx.ssa.declare_ebb_predecessor(
|
|
dest_ebb,
|
|
self.position.basic_block.unwrap(),
|
|
jump_inst,
|
|
);
|
|
}
|
|
|
|
fn handle_ssa_side_effects(&mut self, side_effects: SideEffects) {
|
|
for split_ebb in side_effects.split_ebbs_created {
|
|
self.func_ctx.ebbs[split_ebb].filled = true
|
|
}
|
|
for modified_ebb in side_effects.instructions_added_to_ebbs {
|
|
self.func_ctx.ebbs[modified_ebb].pristine = false
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::greatest_divisible_power_of_two;
|
|
use crate::frontend::{FunctionBuilder, FunctionBuilderContext};
|
|
use crate::Variable;
|
|
use cranelift_codegen::entity::EntityRef;
|
|
use cranelift_codegen::ir::types::*;
|
|
use cranelift_codegen::ir::{AbiParam, ExternalName, Function, InstBuilder, Signature};
|
|
use cranelift_codegen::isa::CallConv;
|
|
use cranelift_codegen::settings;
|
|
use cranelift_codegen::verifier::verify_function;
|
|
use std::string::ToString;
|
|
|
|
fn sample_function(lazy_seal: bool) {
|
|
let mut sig = Signature::new(CallConv::SystemV);
|
|
sig.returns.push(AbiParam::new(I32));
|
|
sig.params.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_ebb();
|
|
let block1 = builder.create_ebb();
|
|
let block2 = builder.create_ebb();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(1);
|
|
let z = Variable::new(2);
|
|
builder.declare_var(x, I32);
|
|
builder.declare_var(y, I32);
|
|
builder.declare_var(z, I32);
|
|
builder.append_ebb_params_for_function_params(block0);
|
|
|
|
builder.switch_to_block(block0);
|
|
if !lazy_seal {
|
|
builder.seal_block(block0);
|
|
}
|
|
{
|
|
let tmp = builder.ebb_params(block0)[0]; // the first function parameter
|
|
builder.def_var(x, tmp);
|
|
}
|
|
{
|
|
let tmp = builder.ins().iconst(I32, 2);
|
|
builder.def_var(y, tmp);
|
|
}
|
|
{
|
|
let arg1 = builder.use_var(x);
|
|
let arg2 = builder.use_var(y);
|
|
let tmp = builder.ins().iadd(arg1, arg2);
|
|
builder.def_var(z, tmp);
|
|
}
|
|
builder.ins().jump(block1, &[]);
|
|
|
|
builder.switch_to_block(block1);
|
|
{
|
|
let arg1 = builder.use_var(y);
|
|
let arg2 = builder.use_var(z);
|
|
let tmp = builder.ins().iadd(arg1, arg2);
|
|
builder.def_var(z, tmp);
|
|
}
|
|
{
|
|
let arg = builder.use_var(y);
|
|
builder.ins().brnz(arg, block2, &[]);
|
|
}
|
|
{
|
|
let arg1 = builder.use_var(z);
|
|
let arg2 = builder.use_var(x);
|
|
let tmp = builder.ins().isub(arg1, arg2);
|
|
builder.def_var(z, tmp);
|
|
}
|
|
{
|
|
let arg = builder.use_var(y);
|
|
builder.ins().return_(&[arg]);
|
|
}
|
|
|
|
builder.switch_to_block(block2);
|
|
if !lazy_seal {
|
|
builder.seal_block(block2);
|
|
}
|
|
|
|
{
|
|
let arg1 = builder.use_var(y);
|
|
let arg2 = builder.use_var(x);
|
|
let tmp = builder.ins().isub(arg1, arg2);
|
|
builder.def_var(y, tmp);
|
|
}
|
|
builder.ins().jump(block1, &[]);
|
|
if !lazy_seal {
|
|
builder.seal_block(block1);
|
|
}
|
|
|
|
if lazy_seal {
|
|
builder.seal_all_blocks();
|
|
}
|
|
|
|
builder.finalize();
|
|
}
|
|
|
|
let flags = settings::Flags::new(settings::builder());
|
|
// println!("{}", func.display(None));
|
|
if let Err(errors) = verify_function(&func, &flags) {
|
|
panic!("{}\n{}", func.display(None), errors)
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn sample() {
|
|
sample_function(false)
|
|
}
|
|
|
|
#[test]
|
|
fn sample_with_lazy_seal() {
|
|
sample_function(true)
|
|
}
|
|
|
|
#[test]
|
|
fn memcpy() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple = ::target_lexicon::Triple::from_str("arm").expect("Couldn't create arm triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires arm support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_ebb();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(1);
|
|
let z = Variable::new(2);
|
|
builder.declare_var(x, target.pointer_type());
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.declare_var(z, I32);
|
|
builder.append_ebb_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let src = builder.use_var(x);
|
|
let dest = builder.use_var(y);
|
|
let size = builder.use_var(y);
|
|
builder.call_memcpy(target.frontend_config(), dest, src, size);
|
|
builder.ins().return_(&[size]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
sig0 = (i32, i32, i32) system_v
|
|
fn0 = %Memcpy sig0
|
|
|
|
ebb0:
|
|
v3 = iconst.i32 0
|
|
v1 -> v3
|
|
v2 = iconst.i32 0
|
|
v0 -> v2
|
|
call fn0(v1, v0, v1)
|
|
return v1
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn small_memcpy() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple = ::target_lexicon::Triple::from_str("arm").expect("Couldn't create arm triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires arm support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_ebb();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(16);
|
|
builder.declare_var(x, target.pointer_type());
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_ebb_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let src = builder.use_var(x);
|
|
let dest = builder.use_var(y);
|
|
let size = 8;
|
|
builder.emit_small_memcpy(target.frontend_config(), dest, src, size, 8, 8);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
ebb0:
|
|
v4 = iconst.i32 0
|
|
v1 -> v4
|
|
v3 = iconst.i32 0
|
|
v0 -> v3
|
|
v2 = load.i64 aligned v0
|
|
store aligned v2, v1
|
|
return v1
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn not_so_small_memcpy() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple = ::target_lexicon::Triple::from_str("arm").expect("Couldn't create arm triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires arm support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_ebb();
|
|
let x = Variable::new(0);
|
|
let y = Variable::new(16);
|
|
builder.declare_var(x, target.pointer_type());
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_ebb_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let src = builder.use_var(x);
|
|
let dest = builder.use_var(y);
|
|
let size = 8192;
|
|
builder.emit_small_memcpy(target.frontend_config(), dest, src, size, 8, 8);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
sig0 = (i32, i32, i32) system_v
|
|
fn0 = %Memcpy sig0
|
|
|
|
ebb0:
|
|
v4 = iconst.i32 0
|
|
v1 -> v4
|
|
v3 = iconst.i32 0
|
|
v0 -> v3
|
|
v2 = iconst.i32 8192
|
|
call fn0(v1, v0, v2)
|
|
return v1
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn small_memset() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple = ::target_lexicon::Triple::from_str("arm").expect("Couldn't create arm triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires arm support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_ebb();
|
|
let y = Variable::new(16);
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_ebb_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let dest = builder.use_var(y);
|
|
let size = 8;
|
|
builder.emit_small_memset(target.frontend_config(), dest, 1, size, 8);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
ebb0:
|
|
v2 = iconst.i32 0
|
|
v0 -> v2
|
|
v1 = iconst.i64 0x0001_0001_0101
|
|
store aligned v1, v0
|
|
return v0
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn not_so_small_memset() {
|
|
use core::str::FromStr;
|
|
use cranelift_codegen::{isa, settings};
|
|
|
|
let shared_builder = settings::builder();
|
|
let shared_flags = settings::Flags::new(shared_builder);
|
|
|
|
let triple = ::target_lexicon::Triple::from_str("arm").expect("Couldn't create arm triple");
|
|
|
|
let target = isa::lookup(triple)
|
|
.ok()
|
|
.map(|b| b.finish(shared_flags))
|
|
.expect("This test requires arm support.");
|
|
|
|
let mut sig = Signature::new(target.default_call_conv());
|
|
sig.returns.push(AbiParam::new(I32));
|
|
|
|
let mut fn_ctx = FunctionBuilderContext::new();
|
|
let mut func = Function::with_name_signature(ExternalName::testcase("sample"), sig);
|
|
{
|
|
let mut builder = FunctionBuilder::new(&mut func, &mut fn_ctx);
|
|
|
|
let block0 = builder.create_ebb();
|
|
let y = Variable::new(16);
|
|
builder.declare_var(y, target.pointer_type());
|
|
builder.append_ebb_params_for_function_params(block0);
|
|
builder.switch_to_block(block0);
|
|
|
|
let dest = builder.use_var(y);
|
|
let size = 8192;
|
|
builder.emit_small_memset(target.frontend_config(), dest, 1, size, 8);
|
|
builder.ins().return_(&[dest]);
|
|
|
|
builder.seal_all_blocks();
|
|
builder.finalize();
|
|
}
|
|
|
|
assert_eq!(
|
|
func.display(None).to_string(),
|
|
"function %sample() -> i32 system_v {
|
|
sig0 = (i32, i32, i32) system_v
|
|
fn0 = %Memset sig0
|
|
|
|
ebb0:
|
|
v4 = iconst.i32 0
|
|
v0 -> v4
|
|
v1 = iconst.i8 1
|
|
v2 = iconst.i32 8192
|
|
v3 = uextend.i32 v1
|
|
call fn0(v0, v3, v2)
|
|
return v0
|
|
}
|
|
"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_greatest_divisible_power_of_two() {
|
|
assert_eq!(64, greatest_divisible_power_of_two(64));
|
|
assert_eq!(16, greatest_divisible_power_of_two(48));
|
|
assert_eq!(8, greatest_divisible_power_of_two(24));
|
|
assert_eq!(1, greatest_divisible_power_of_two(25));
|
|
}
|
|
}
|