2b3df1a506
Merge the `use` parts of the `no_std` branch. This reduces the diffs between master and the `no_std` branch, making it easier to maintain. Most of these changes are derived from patches by @lachlansneff in https://github.com/Cretonne/cretonne/tree/no_std.
506 lines
16 KiB
Rust
506 lines
16 KiB
Rust
//! Converting Cretonne IL to text.
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//!
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//! The `write` module provides the `write_function` function which converts an IL `Function` to an
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//! equivalent textual representation. This textual representation can be read back by the
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//! `cretonne-reader` crate.
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use ir::{Function, DataFlowGraph, Ebb, Inst, Value, ValueDef, Type, SigRef};
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use isa::{TargetIsa, RegInfo};
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use std::fmt::{self, Result, Error, Write};
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use std::result;
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use packed_option::ReservedValue;
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use std::string::String;
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/// Write `func` to `w` as equivalent text.
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/// Use `isa` to emit ISA-dependent annotations.
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pub fn write_function(w: &mut Write, func: &Function, isa: Option<&TargetIsa>) -> Result {
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let regs = isa.map(TargetIsa::register_info);
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let regs = regs.as_ref();
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write_spec(w, func, regs)?;
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writeln!(w, " {{")?;
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let mut any = write_preamble(w, func, regs)?;
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for ebb in &func.layout {
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if any {
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writeln!(w, "")?;
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}
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write_ebb(w, func, isa, ebb)?;
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any = true;
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}
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writeln!(w, "}}")
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}
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// ====--------------------------------------------------------------------------------------====//
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//
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// Function spec.
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//
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// ====--------------------------------------------------------------------------------------====//
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fn write_spec(w: &mut Write, func: &Function, regs: Option<&RegInfo>) -> Result {
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write!(w, "function {}{}", func.name, func.signature.display(regs))
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}
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fn write_preamble(
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w: &mut Write,
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func: &Function,
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regs: Option<&RegInfo>,
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) -> result::Result<bool, Error> {
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let mut any = false;
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for ss in func.stack_slots.keys() {
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any = true;
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writeln!(w, " {} = {}", ss, func.stack_slots[ss])?;
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}
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for gv in func.global_vars.keys() {
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any = true;
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writeln!(w, " {} = {}", gv, func.global_vars[gv])?;
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}
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for heap in func.heaps.keys() {
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any = true;
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writeln!(w, " {} = {}", heap, func.heaps[heap])?;
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}
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// Write out all signatures before functions since function declarations can refer to
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// signatures.
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for sig in func.dfg.signatures.keys() {
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any = true;
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writeln!(
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w,
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" {} = {}",
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sig,
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func.dfg.signatures[sig].display(regs)
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)?;
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}
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for fnref in func.dfg.ext_funcs.keys() {
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any = true;
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let ext_func = &func.dfg.ext_funcs[fnref];
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if ext_func.signature != SigRef::reserved_value() {
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writeln!(w, " {} = {}", fnref, ext_func)?;
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}
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}
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for jt in func.jump_tables.keys() {
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any = true;
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writeln!(w, " {} = {}", jt, func.jump_tables[jt])?;
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}
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Ok(any)
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}
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// ====--------------------------------------------------------------------------------------====//
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//
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// Basic blocks
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//
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// ====--------------------------------------------------------------------------------------====//
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pub fn write_arg(w: &mut Write, func: &Function, regs: Option<&RegInfo>, arg: Value) -> Result {
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write!(w, "{}: {}", arg, func.dfg.value_type(arg))?;
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let loc = func.locations[arg];
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if loc.is_assigned() {
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write!(w, " [{}]", loc.display(regs))?
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}
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Ok(())
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}
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pub fn write_ebb_header(
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w: &mut Write,
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func: &Function,
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isa: Option<&TargetIsa>,
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ebb: Ebb,
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indent: usize,
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) -> Result {
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// Write out the basic block header, outdented:
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//
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// ebb1:
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// ebb1(v1: i32):
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// ebb10(v4: f64, v5: b1):
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//
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// The `indent` is the instruction indentation. EBB headers are 4 spaces out from that.
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write!(w, "{1:0$}{2}", indent - 4, "", ebb)?;
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let regs = isa.map(TargetIsa::register_info);
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let regs = regs.as_ref();
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let mut args = func.dfg.ebb_params(ebb).iter().cloned();
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match args.next() {
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None => return writeln!(w, ":"),
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Some(arg) => {
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write!(w, "(")?;
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write_arg(w, func, regs, arg)?;
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}
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}
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// Remaining arguments.
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for arg in args {
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write!(w, ", ")?;
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write_arg(w, func, regs, arg)?;
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}
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writeln!(w, "):")
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}
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pub fn write_ebb(w: &mut Write, func: &Function, isa: Option<&TargetIsa>, ebb: Ebb) -> Result {
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// Indent all instructions if any encodings are present.
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let indent = if func.encodings.is_empty() && func.srclocs.is_empty() {
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4
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} else {
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36
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};
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write_ebb_header(w, func, isa, ebb, indent)?;
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for inst in func.layout.ebb_insts(ebb) {
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write_instruction(w, func, isa, inst, indent)?;
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}
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Ok(())
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}
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// ====--------------------------------------------------------------------------------------====//
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//
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// Instructions
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//
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// ====--------------------------------------------------------------------------------------====//
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// Should `inst` be printed with a type suffix?
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//
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// Polymorphic instructions may need a suffix indicating the value of the controlling type variable
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// if it can't be trivially inferred.
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//
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fn type_suffix(func: &Function, inst: Inst) -> Option<Type> {
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let inst_data = &func.dfg[inst];
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let constraints = inst_data.opcode().constraints();
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if !constraints.is_polymorphic() {
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return None;
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}
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// If the controlling type variable can be inferred from the type of the designated value input
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// operand, we don't need the type suffix.
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if constraints.use_typevar_operand() {
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let ctrl_var = inst_data.typevar_operand(&func.dfg.value_lists).unwrap();
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let def_ebb = match func.dfg.value_def(ctrl_var) {
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ValueDef::Result(instr, _) => func.layout.inst_ebb(instr),
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ValueDef::Param(ebb, _) => Some(ebb),
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};
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if def_ebb.is_some() && def_ebb == func.layout.inst_ebb(inst) {
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return None;
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}
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}
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let rtype = func.dfg.ctrl_typevar(inst);
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assert!(
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!rtype.is_void(),
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"Polymorphic instruction must produce a result"
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);
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Some(rtype)
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}
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// Write out any value aliases appearing in `inst`.
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fn write_value_aliases(w: &mut Write, func: &Function, inst: Inst, indent: usize) -> Result {
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for &arg in func.dfg.inst_args(inst) {
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let resolved = func.dfg.resolve_aliases(arg);
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if resolved != arg {
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writeln!(w, "{1:0$}{2} -> {3}", indent, "", arg, resolved)?;
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}
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}
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Ok(())
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}
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fn write_instruction(
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w: &mut Write,
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func: &Function,
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isa: Option<&TargetIsa>,
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inst: Inst,
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indent: usize,
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) -> Result {
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// Value aliases come out on lines before the instruction using them.
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write_value_aliases(w, func, inst, indent)?;
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// Prefix containing source location, encoding, and value locations.
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let mut s = String::with_capacity(16);
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// Source location goes first.
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let srcloc = func.srclocs[inst];
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if !srcloc.is_default() {
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write!(s, "{} ", srcloc)?;
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}
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// Write out encoding info.
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if let Some(enc) = func.encodings.get(inst).cloned() {
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if let Some(isa) = isa {
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write!(s, "[{}", isa.encoding_info().display(enc))?;
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// Write value locations, if we have them.
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if !func.locations.is_empty() {
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let regs = isa.register_info();
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for &r in func.dfg.inst_results(inst) {
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write!(s, ",{}", func.locations[r].display(®s))?
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}
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}
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write!(s, "] ")?;
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} else {
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write!(s, "[{}] ", enc)?;
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}
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}
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// Write out prefix and indent the instruction.
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write!(w, "{1:0$}", indent, s)?;
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// Write out the result values, if any.
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let mut has_results = false;
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for r in func.dfg.inst_results(inst) {
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if !has_results {
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has_results = true;
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write!(w, "{}", r)?;
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} else {
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write!(w, ", {}", r)?;
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}
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}
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if has_results {
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write!(w, " = ")?;
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}
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// Then the opcode, possibly with a '.type' suffix.
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let opcode = func.dfg[inst].opcode();
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match type_suffix(func, inst) {
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Some(suf) => write!(w, "{}.{}", opcode, suf)?,
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None => write!(w, "{}", opcode)?,
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}
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write_operands(w, &func.dfg, isa, inst)?;
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writeln!(w, "")
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}
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/// Write the operands of `inst` to `w` with a prepended space.
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pub fn write_operands(
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w: &mut Write,
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dfg: &DataFlowGraph,
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isa: Option<&TargetIsa>,
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inst: Inst,
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) -> Result {
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let pool = &dfg.value_lists;
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use ir::instructions::InstructionData::*;
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match dfg[inst] {
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Unary { arg, .. } => write!(w, " {}", arg),
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UnaryImm { imm, .. } => write!(w, " {}", imm),
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UnaryIeee32 { imm, .. } => write!(w, " {}", imm),
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UnaryIeee64 { imm, .. } => write!(w, " {}", imm),
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UnaryBool { imm, .. } => write!(w, " {}", imm),
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UnaryGlobalVar { global_var, .. } => write!(w, " {}", global_var),
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Binary { args, .. } => write!(w, " {}, {}", args[0], args[1]),
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BinaryImm { arg, imm, .. } => write!(w, " {}, {}", arg, imm),
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Ternary { args, .. } => write!(w, " {}, {}, {}", args[0], args[1], args[2]),
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MultiAry { ref args, .. } => {
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if args.is_empty() {
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write!(w, "")
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} else {
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write!(w, " {}", DisplayValues(args.as_slice(pool)))
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}
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}
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NullAry { .. } => write!(w, " "),
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InsertLane { lane, args, .. } => write!(w, " {}, {}, {}", args[0], lane, args[1]),
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ExtractLane { lane, arg, .. } => write!(w, " {}, {}", arg, lane),
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IntCompare { cond, args, .. } => write!(w, " {} {}, {}", cond, args[0], args[1]),
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IntCompareImm { cond, arg, imm, .. } => write!(w, " {} {}, {}", cond, arg, imm),
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IntCond { cond, arg, .. } => write!(w, " {} {}", cond, arg),
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FloatCompare { cond, args, .. } => write!(w, " {} {}, {}", cond, args[0], args[1]),
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FloatCond { cond, arg, .. } => write!(w, " {} {}", cond, arg),
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IntSelect { cond, args, .. } => {
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write!(w, " {} {}, {}, {}", cond, args[0], args[1], args[2])
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}
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Jump {
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destination,
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ref args,
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..
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} => {
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write!(w, " {}", destination)?;
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write_ebb_args(w, args.as_slice(pool))
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}
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Branch {
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destination,
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ref args,
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..
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} => {
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let args = args.as_slice(pool);
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write!(w, " {}, {}", args[0], destination)?;
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write_ebb_args(w, &args[1..])
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}
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BranchInt {
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cond,
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destination,
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ref args,
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..
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} => {
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let args = args.as_slice(pool);
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write!(w, " {} {}, {}", cond, args[0], destination)?;
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write_ebb_args(w, &args[1..])
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}
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BranchFloat {
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cond,
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destination,
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ref args,
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..
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} => {
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let args = args.as_slice(pool);
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write!(w, " {} {}, {}", cond, args[0], destination)?;
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write_ebb_args(w, &args[1..])
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}
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BranchIcmp {
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cond,
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destination,
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ref args,
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..
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} => {
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let args = args.as_slice(pool);
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write!(w, " {} {}, {}, {}", cond, args[0], args[1], destination)?;
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write_ebb_args(w, &args[2..])
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}
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BranchTable { arg, table, .. } => write!(w, " {}, {}", arg, table),
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Call { func_ref, ref args, .. } => {
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write!(w, " {}({})", func_ref, DisplayValues(args.as_slice(pool)))
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}
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IndirectCall { sig_ref, ref args, .. } => {
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let args = args.as_slice(pool);
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write!(
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w,
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" {}, {}({})",
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sig_ref,
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args[0],
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DisplayValues(&args[1..])
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)
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}
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FuncAddr { func_ref, .. } => write!(w, " {}", func_ref),
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StackLoad { stack_slot, offset, .. } => write!(w, " {}{}", stack_slot, offset),
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StackStore {
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arg,
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stack_slot,
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offset,
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..
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} => write!(w, " {}, {}{}", arg, stack_slot, offset),
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HeapAddr { heap, arg, imm, .. } => write!(w, " {}, {}, {}", heap, arg, imm),
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Load { flags, arg, offset, .. } => write!(w, "{} {}{}", flags, arg, offset),
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Store {
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flags,
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args,
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offset,
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..
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} => write!(w, "{} {}, {}{}", flags, args[0], args[1], offset),
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RegMove { arg, src, dst, .. } => {
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if let Some(isa) = isa {
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let regs = isa.register_info();
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write!(
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w,
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" {}, {} -> {}",
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arg,
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regs.display_regunit(src),
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regs.display_regunit(dst)
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)
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} else {
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write!(w, " {}, %{} -> %{}", arg, src, dst)
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}
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}
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CopySpecial { src, dst, .. } => {
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if let Some(isa) = isa {
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let regs = isa.register_info();
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write!(
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w,
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" {} -> {}",
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regs.display_regunit(src),
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regs.display_regunit(dst)
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)
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} else {
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write!(w, " %{} -> %{}", src, dst)
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}
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}
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RegSpill { arg, src, dst, .. } => {
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if let Some(isa) = isa {
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let regs = isa.register_info();
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write!(w, " {}, {} -> {}", arg, regs.display_regunit(src), dst)
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} else {
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write!(w, " {}, %{} -> {}", arg, src, dst)
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}
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}
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RegFill { arg, src, dst, .. } => {
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if let Some(isa) = isa {
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let regs = isa.register_info();
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write!(w, " {}, {} -> {}", arg, src, regs.display_regunit(dst))
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} else {
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write!(w, " {}, {} -> %{}", arg, src, dst)
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}
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}
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Trap { code, .. } => write!(w, " {}", code),
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CondTrap { arg, code, .. } => write!(w, " {}, {}", arg, code),
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IntCondTrap { cond, arg, code, .. } => write!(w, " {} {}, {}", cond, arg, code),
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FloatCondTrap { cond, arg, code, .. } => write!(w, " {} {}, {}", cond, arg, code),
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}
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}
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/// Write EBB args using optional parantheses.
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fn write_ebb_args(w: &mut Write, args: &[Value]) -> Result {
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if args.is_empty() {
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Ok(())
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} else {
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write!(w, "({})", DisplayValues(args))
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}
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}
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/// Displayable slice of values.
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struct DisplayValues<'a>(&'a [Value]);
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impl<'a> fmt::Display for DisplayValues<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result {
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for (i, val) in self.0.iter().enumerate() {
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if i == 0 {
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write!(f, "{}", val)?;
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} else {
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write!(f, ", {}", val)?;
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}
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use ir::{Function, ExternalName, StackSlotData, StackSlotKind};
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use ir::types;
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use std::string::ToString;
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#[test]
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fn basic() {
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let mut f = Function::new();
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assert_eq!(f.to_string(), "function u0:0() native {\n}\n");
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f.name = ExternalName::testcase("foo");
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assert_eq!(f.to_string(), "function %foo() native {\n}\n");
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f.create_stack_slot(StackSlotData::new(StackSlotKind::ExplicitSlot, 4));
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assert_eq!(
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f.to_string(),
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"function %foo() native {\n ss0 = explicit_slot 4\n}\n"
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);
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let ebb = f.dfg.make_ebb();
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f.layout.append_ebb(ebb);
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assert_eq!(
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f.to_string(),
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"function %foo() native {\n ss0 = explicit_slot 4\n\nebb0:\n}\n"
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);
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f.dfg.append_ebb_param(ebb, types::I8);
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assert_eq!(
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f.to_string(),
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"function %foo() native {\n ss0 = explicit_slot 4\n\nebb0(v0: i8):\n}\n"
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);
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f.dfg.append_ebb_param(ebb, types::F32.by(4).unwrap());
|
|
assert_eq!(
|
|
f.to_string(),
|
|
"function %foo() native {\n ss0 = explicit_slot 4\n\nebb0(v0: i8, v1: f32x4):\n}\n"
|
|
);
|
|
}
|
|
}
|