f8545574b5
We want to separate the Python classes that make up the DSL used to define the Cretonne language from the concrete definitions. - cdsl.types defines the ValueType class hierarchy. - base.types defines the concrete types.
633 lines
24 KiB
Python
633 lines
24 KiB
Python
"""
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Generate sources with instruction info.
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"""
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from __future__ import absolute_import
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import srcgen
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import constant_hash
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from unique_table import UniqueTable, UniqueSeqTable
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import cdsl.types
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import cretonne
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def gen_formats(fmt):
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# type: (srcgen.Formatter) -> None
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"""Generate an instruction format enumeration"""
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fmt.doc_comment('An instruction format')
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fmt.doc_comment('')
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fmt.doc_comment('Every opcode has a corresponding instruction format')
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fmt.doc_comment('which is represented by both the `InstructionFormat`')
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fmt.doc_comment('and the `InstructionData` enums.')
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fmt.line('#[derive(Copy, Clone, PartialEq, Eq, Debug)]')
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with fmt.indented('pub enum InstructionFormat {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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fmt.doc_comment(str(f))
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fmt.line(f.name + ',')
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fmt.line()
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# Emit a From<InstructionData> which also serves to verify that
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# InstructionFormat and InstructionData are in sync.
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with fmt.indented(
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"impl<'a> From<&'a InstructionData> for InstructionFormat {", '}'):
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with fmt.indented(
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"fn from(inst: &'a InstructionData) -> InstructionFormat {",
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'}'):
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with fmt.indented('match *inst {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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fmt.line(('InstructionData::{} {{ .. }} => ' +
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'InstructionFormat::{},')
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.format(f.name, f.name))
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fmt.line()
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def gen_arguments_method(fmt, is_mut):
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# type: (srcgen.Formatter, bool) -> None
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method = 'arguments'
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mut = ''
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rslice = 'ref_slice'
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if is_mut:
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method += '_mut'
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mut = 'mut '
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rslice += '_mut'
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with fmt.indented(
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'pub fn {f}(&{m}self) -> [&{m}[Value]; 2] {{'
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.format(f=method, m=mut), '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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n = 'InstructionData::' + f.name
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has_varargs = cretonne.variable_args in f.kinds
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# Formats with both fixed and variable arguments delegate to
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# the data struct. We need to work around borrow checker quirks
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# when extracting two mutable references.
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if has_varargs and len(f.value_operands) > 0:
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fmt.line(
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'{} {{ ref {}data, .. }} => data.{}(),'
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.format(n, mut, method))
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continue
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# Fixed args.
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if len(f.value_operands) == 0:
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arg = '&{}[]'.format(mut)
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capture = ''
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elif len(f.value_operands) == 1:
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if f.boxed_storage:
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capture = 'ref {}data, '.format(mut)
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arg = '{}(&{}data.arg)'.format(rslice, mut)
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else:
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capture = 'ref {}arg, '.format(mut)
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arg = '{}(arg)'.format(rslice)
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else:
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if f.boxed_storage:
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capture = 'ref {}data, '.format(mut)
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arg = '&{}data.args'.format(mut)
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else:
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capture = 'ref {}args, '.format(mut)
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arg = 'args'
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# Varargs.
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if cretonne.variable_args in f.kinds:
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varg = '&{}data.varargs'.format(mut)
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capture = 'ref {}data, '.format(mut)
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else:
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varg = '&{}[]'.format(mut)
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fmt.line(
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'{} {{ {} .. }} => [{}, {}],'
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.format(n, capture, arg, varg))
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def gen_instruction_data_impl(fmt):
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# type: (srcgen.Formatter) -> None
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"""
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Generate the boring parts of the InstructionData implementation.
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These methods in `impl InstructionData` can be generated automatically from
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the instruction formats:
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- `pub fn opcode(&self) -> Opcode`
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- `pub fn first_type(&self) -> Type`
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- `pub fn second_result(&self) -> Option<Value>`
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- `pub fn second_result_mut<'a>(&'a mut self) -> Option<&'a mut Value>`
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- `pub fn arguments(&self) -> (&[Value], &[Value])`
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"""
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# The `opcode` and `first_type` methods simply read the `opcode` and `ty`
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# members. This is really a workaround for Rust's enum types missing shared
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# members.
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with fmt.indented('impl InstructionData {', '}'):
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fmt.doc_comment('Get the opcode of this instruction.')
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with fmt.indented('pub fn opcode(&self) -> Opcode {', '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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fmt.line(
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'InstructionData::{} {{ opcode, .. }} => opcode,'
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.format(f.name))
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fmt.doc_comment('Type of the first result, or `VOID`.')
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with fmt.indented('pub fn first_type(&self) -> Type {', '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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fmt.line(
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'InstructionData::{} {{ ty, .. }} => ty,'
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.format(f.name))
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fmt.doc_comment('Mutable reference to the type of the first result.')
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with fmt.indented(
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'pub fn first_type_mut(&mut self) -> &mut Type {', '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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fmt.line(
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'InstructionData::{} {{ ref mut ty, .. }} => ty,'
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.format(f.name))
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# Generate shared and mutable accessors for `second_result` which only
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# applies to instruction formats that can produce multiple results.
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# Everything else returns `None`.
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fmt.doc_comment('Second result value, if any.')
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with fmt.indented(
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'pub fn second_result(&self) -> Option<Value> {', '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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if f.multiple_results:
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fmt.line(
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'InstructionData::' + f.name +
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' { second_result, .. }' +
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' => Some(second_result),')
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else:
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# Single or no results.
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fmt.line(
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'InstructionData::{} {{ .. }} => None,'
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.format(f.name))
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fmt.doc_comment('Mutable reference to second result value, if any.')
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with fmt.indented(
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"pub fn second_result_mut<'a>(&'a mut self)" +
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" -> Option<&'a mut Value> {", '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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if f.multiple_results:
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fmt.line(
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'InstructionData::' + f.name +
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' { ref mut second_result, .. }' +
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' => Some(second_result),')
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else:
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# Single or no results.
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fmt.line(
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'InstructionData::{} {{ .. }} => None,'
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.format(f.name))
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fmt.doc_comment('Get the controlling type variable operand.')
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with fmt.indented(
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'pub fn typevar_operand(&self) -> Option<Value> {', '}'):
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with fmt.indented('match *self {', '}'):
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for f in cretonne.InstructionFormat.all_formats:
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n = 'InstructionData::' + f.name
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if f.typevar_operand is None:
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fmt.line(n + ' { .. } => None,')
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elif len(f.value_operands) == 1:
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# We have a single value operand called 'arg'.
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if f.boxed_storage:
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fmt.line(
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n + ' { ref data, .. } => Some(data.arg),')
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else:
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fmt.line(n + ' { arg, .. } => Some(arg),')
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else:
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# We have multiple value operands and an array `args`.
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# Which `args` index to use?
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# Map from index into f.kinds into f.value_operands
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# index.
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i = f.value_operands.index(f.typevar_operand)
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if f.boxed_storage:
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fmt.line(
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n +
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' { ref data, .. } => ' +
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('Some(data.args[{}]),'.format(i)))
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else:
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fmt.line(
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n +
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' {{ ref args, .. }} => Some(args[{}]),'
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.format(i))
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fmt.doc_comment(
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"""
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Get the value arguments to this instruction.
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This is returned as two `Value` slices. The first one
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represents the fixed arguments, the second any variable
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arguments.
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""")
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gen_arguments_method(fmt, False)
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fmt.doc_comment(
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"""
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Get mutable references to the value arguments to this
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instruction.
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""")
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gen_arguments_method(fmt, True)
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def collect_instr_groups(isas):
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seen = set()
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groups = []
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for isa in isas:
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for g in isa.instruction_groups:
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if g not in seen:
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groups.append(g)
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seen.add(g)
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return groups
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def gen_opcodes(groups, fmt):
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"""
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Generate opcode enumerations.
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Return a list of all instructions.
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"""
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fmt.doc_comment('An instruction opcode.')
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fmt.doc_comment('')
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fmt.doc_comment('All instructions from all supported ISAs are present.')
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fmt.line('#[derive(Copy, Clone, PartialEq, Eq, Debug)]')
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instrs = []
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with fmt.indented('pub enum Opcode {', '}'):
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fmt.doc_comment('An invalid opcode.')
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fmt.line('NotAnOpcode,')
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for g in groups:
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for i in g.instructions:
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instrs.append(i)
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i.number = len(instrs)
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fmt.doc_comment('`{}`. ({})'.format(i, i.format.name))
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# Document polymorphism.
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if i.is_polymorphic:
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if i.use_typevar_operand:
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fmt.doc_comment(
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'Type inferred from {}.'
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.format(i.ins[i.format.typevar_operand]))
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# Enum variant itself.
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fmt.line(i.camel_name + ',')
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fmt.line()
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# Generate a private opcode_format table.
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with fmt.indented(
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'const OPCODE_FORMAT: [InstructionFormat; {}] = ['
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.format(len(instrs)),
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'];'):
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for i in instrs:
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fmt.format(
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'InstructionFormat::{}, // {}',
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i.format.name, i.name)
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fmt.line()
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# Generate a private opcode_name function.
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with fmt.indented('fn opcode_name(opc: Opcode) -> &\'static str {', '}'):
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with fmt.indented('match opc {', '}'):
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fmt.line('Opcode::NotAnOpcode => "<not an opcode>",')
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for i in instrs:
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fmt.format('Opcode::{} => "{}",', i.camel_name, i.name)
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fmt.line()
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# Generate an opcode hash table for looking up opcodes by name.
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hash_table = constant_hash.compute_quadratic(
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instrs,
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lambda i: constant_hash.simple_hash(i.name))
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with fmt.indented(
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'const OPCODE_HASH_TABLE: [Opcode; {}] = ['
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.format(len(hash_table)), '];'):
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for i in hash_table:
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if i is None:
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fmt.line('Opcode::NotAnOpcode,')
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else:
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fmt.format('Opcode::{},', i.camel_name)
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fmt.line()
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return instrs
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def get_constraint(op, ctrl_typevar, type_sets):
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"""
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Get the value type constraint for an SSA value operand, where
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`ctrl_typevar` is the controlling type variable.
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Each operand constraint is represented as a string, one of:
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- `Concrete(vt)`, where `vt` is a value type name.
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- `Free(idx)` where `idx` is an index into `type_sets`.
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- `Same`, `Lane`, `AsBool` for controlling typevar-derived constraints.
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"""
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assert op.kind is cretonne.value
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t = op.typ
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# A concrete value type.
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if isinstance(t, cdsl.types.ValueType):
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return 'Concrete({})'.format(t.rust_name())
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if t.free_typevar() is not ctrl_typevar:
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assert not t.is_derived
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return 'Free({})'.format(type_sets.add(t.type_set))
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if t.is_derived:
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assert t.base is ctrl_typevar, "Not derived directly from ctrl_typevar"
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return t.derived_func
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assert t is ctrl_typevar
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return 'Same'
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def gen_type_constraints(fmt, instrs):
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"""
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Generate value type constraints for all instructions.
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- Emit a compact constant table of ValueTypeSet objects.
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- Emit a compact constant table of OperandConstraint objects.
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- Emit an opcode-indexed table of instruction constraints.
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"""
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# Table of TypeSet instances.
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type_sets = UniqueTable()
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# Table of operand constraint sequences (as tuples). Each operand
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# constraint is represented as a string, one of:
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# - `Concrete(vt)`, where `vt` is a value type name.
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# - `Free(idx)` where `idx` isan index into `type_sets`.
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# - `Same`, `Lane`, `AsBool` for controlling typevar-derived constraints.
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operand_seqs = UniqueSeqTable()
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# Preload table with constraints for typical binops.
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operand_seqs.add(['Same'] * 3)
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# TypeSet indexes are encoded in 8 bits, with `0xff` reserved.
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typeset_limit = 0xff
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fmt.comment('Table of opcode constraints.')
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with fmt.indented(
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'const OPCODE_CONSTRAINTS : [OpcodeConstraints; {}] = ['
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.format(len(instrs)), '];'):
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for i in instrs:
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# Collect constraints for the value results, not including
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# `variable_args` results which are always special cased.
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constraints = list()
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ctrl_typevar = None
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ctrl_typeset = typeset_limit
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if i.is_polymorphic:
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ctrl_typevar = i.ctrl_typevar
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ctrl_typeset = type_sets.add(ctrl_typevar.type_set)
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for idx in i.value_results:
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constraints.append(
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get_constraint(i.outs[idx], ctrl_typevar, type_sets))
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for idx in i.format.value_operands:
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constraints.append(
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get_constraint(i.ins[idx], ctrl_typevar, type_sets))
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offset = operand_seqs.add(constraints)
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fixed_results = len(i.value_results)
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use_typevar_operand = i.is_polymorphic and i.use_typevar_operand
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fmt.comment(
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'{}: fixed_results={}, use_typevar_operand={}'
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.format(i.camel_name, fixed_results, use_typevar_operand))
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fmt.comment('Constraints={}'.format(constraints))
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if i.is_polymorphic:
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fmt.comment(
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'Polymorphic over {}'.format(ctrl_typevar.type_set))
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# Compute the bit field encoding, c.f. instructions.rs.
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assert fixed_results < 8, "Bit field encoding too tight"
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flags = fixed_results
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if use_typevar_operand:
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flags |= 8
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with fmt.indented('OpcodeConstraints {', '},'):
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fmt.line('flags: {:#04x},'.format(flags))
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fmt.line('typeset_offset: {},'.format(ctrl_typeset))
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fmt.line('constraint_offset: {},'.format(offset))
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fmt.comment('Table of value type sets.')
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assert len(type_sets.table) <= typeset_limit, "Too many type sets"
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with fmt.indented(
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'const TYPE_SETS : [ValueTypeSet; {}] = ['
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.format(len(type_sets.table)), '];'):
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for ts in type_sets.table:
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with fmt.indented('ValueTypeSet {', '},'):
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ts.emit_fields(fmt)
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fmt.comment('Table of operand constraint sequences.')
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with fmt.indented(
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'const OPERAND_CONSTRAINTS : [OperandConstraint; {}] = ['
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.format(len(operand_seqs.table)), '];'):
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for c in operand_seqs.table:
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fmt.line('OperandConstraint::{},'.format(c))
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def gen_format_constructor(iform, fmt):
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"""
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Emit a method for creating and inserting inserting an `iform` instruction,
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where `iform` is an instruction format.
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Instruction formats that can produce multiple results take a `ctrl_typevar`
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argument for deducing the result types. Others take a `result_type`
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argument.
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"""
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# Construct method arguments.
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args = ['self', 'opcode: Opcode']
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if iform.multiple_results:
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args.append('ctrl_typevar: Type')
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# `dfg::make_inst_results` will compute the result type.
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result_type = 'types::VOID'
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else:
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args.append('result_type: Type')
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result_type = 'result_type'
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# Normal operand arguments.
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for idx, kind in enumerate(iform.kinds):
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args.append('op{}: {}'.format(idx, kind.rust_type))
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proto = '{}({})'.format(iform.name, ', '.join(args))
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proto += " -> (Inst, &'f mut DataFlowGraph)"
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fmt.doc_comment(str(iform))
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fmt.line('#[allow(non_snake_case)]')
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with fmt.indented('fn {} {{'.format(proto), '}'):
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# Generate the instruction data.
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with fmt.indented(
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'let data = InstructionData::{} {{'.format(iform.name), '};'):
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fmt.line('opcode: opcode,')
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fmt.line('ty: {},'.format(result_type))
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if iform.multiple_results:
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fmt.line('second_result: Value::default(),')
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if iform.boxed_storage:
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with fmt.indented(
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'data: Box::new(instructions::{}Data {{'
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.format(iform.name), '}),'):
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gen_member_inits(iform, fmt)
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else:
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gen_member_inits(iform, fmt)
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# Create result values if necessary.
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if iform.multiple_results:
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fmt.line('self.complex_instruction(data, ctrl_typevar)')
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else:
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fmt.line('self.simple_instruction(data)')
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def gen_member_inits(iform, fmt):
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"""
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Emit member initializers for an `iform` instruction.
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"""
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# Values first.
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if len(iform.value_operands) == 1:
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fmt.line('arg: op{},'.format(iform.value_operands[0]))
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elif len(iform.value_operands) > 1:
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fmt.line('args: [{}],'.format(
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', '.join('op{}'.format(i) for i in iform.value_operands)))
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# Immediates and entity references.
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|
for idx, member in enumerate(iform.members):
|
|
if member:
|
|
fmt.line('{}: op{},'.format(member, idx))
|
|
|
|
|
|
def gen_inst_builder(inst, fmt):
|
|
"""
|
|
Emit a method for generating the instruction `inst`.
|
|
|
|
The method will create and insert an instruction, then return the result
|
|
values, or the instruction reference itself for instructions that don't
|
|
have results.
|
|
"""
|
|
|
|
# Construct method arguments.
|
|
args = ['self']
|
|
|
|
# The controlling type variable will be inferred from the input values if
|
|
# possible. Otherwise, it is the first method argument.
|
|
if inst.is_polymorphic and not inst.use_typevar_operand:
|
|
args.append('{}: Type'.format(inst.ctrl_typevar.name))
|
|
|
|
tmpl_types = list()
|
|
into_args = list()
|
|
for op in inst.ins:
|
|
if isinstance(op.kind, cretonne.ImmediateKind):
|
|
t = 'T{}{}'.format(1 + len(tmpl_types), op.kind.name)
|
|
tmpl_types.append('{}: Into<{}>'.format(t, op.kind.rust_type))
|
|
into_args.append(op.name)
|
|
else:
|
|
t = op.kind.rust_type
|
|
args.append('{}: {}'.format(op.name, t))
|
|
|
|
# Return the inst reference for result-less instructions.
|
|
if len(inst.value_results) == 0:
|
|
rtype = 'Inst'
|
|
elif len(inst.value_results) == 1:
|
|
rtype = 'Value'
|
|
else:
|
|
rvals = ', '.join(len(inst.value_results) * ['Value'])
|
|
rtype = '({})'.format(rvals)
|
|
|
|
if len(tmpl_types) > 0:
|
|
tmpl = '<{}>'.format(', '.join(tmpl_types))
|
|
else:
|
|
tmpl = ''
|
|
proto = '{}{}({}) -> {}'.format(
|
|
inst.snake_name(), tmpl, ', '.join(args), rtype)
|
|
|
|
fmt.doc_comment('`{}`\n\n{}'.format(inst, inst.blurb()))
|
|
fmt.line('#[allow(non_snake_case)]')
|
|
with fmt.indented('fn {} {{'.format(proto), '}'):
|
|
# Convert all of the `Into<>` arguments.
|
|
for arg in into_args:
|
|
fmt.line('let {} = {}.into();'.format(arg, arg))
|
|
|
|
# Arguments for instruction constructor.
|
|
args = ['Opcode::' + inst.camel_name]
|
|
|
|
if inst.is_polymorphic and not inst.use_typevar_operand:
|
|
# This was an explicit method argument.
|
|
args.append(inst.ctrl_typevar.name)
|
|
elif len(inst.value_results) == 0:
|
|
args.append('types::VOID')
|
|
elif inst.is_polymorphic:
|
|
# Infer the controlling type variable from the input operands.
|
|
fmt.line(
|
|
'let ctrl_typevar = self.data_flow_graph().value_type({});'
|
|
.format(inst.ins[inst.format.typevar_operand].name))
|
|
if inst.format.multiple_results:
|
|
# The format constructor will resolve the result types from the
|
|
# type var.
|
|
args.append('ctrl_typevar')
|
|
elif inst.outs[inst.value_results[0]].typ == inst.ctrl_typevar:
|
|
# The format constructor expects a simple result type.
|
|
# No type transformation needed from the controlling type
|
|
# variable.
|
|
args.append('ctrl_typevar')
|
|
else:
|
|
# The format constructor expects a simple result type.
|
|
# TODO: This formula could be resolved ahead of time.
|
|
args.append(
|
|
'Opcode::{}.constraints().result_type(0, ctrl_typevar)'
|
|
.format(inst.camel_name))
|
|
else:
|
|
# This non-polymorphic instruction has a fixed result type.
|
|
args.append(
|
|
'types::' +
|
|
inst.outs[inst.value_results[0]].typ.name.upper())
|
|
|
|
args.extend(op.name for op in inst.ins)
|
|
args = ', '.join(args)
|
|
# Call to the format constructor,
|
|
fcall = 'self.{}({})'.format(inst.format.name, args)
|
|
|
|
if len(inst.value_results) == 0:
|
|
fmt.line(fcall + '.0')
|
|
return
|
|
|
|
if len(inst.value_results) == 1:
|
|
fmt.line('Value::new_direct({}.0)'.format(fcall))
|
|
return
|
|
|
|
fmt.line('let (inst, dfg) = {};'.format(fcall))
|
|
fmt.line('let mut results = dfg.inst_results(inst);')
|
|
fmt.line('({})'.format(', '.join(
|
|
len(inst.value_results) * ['results.next().unwrap()'])))
|
|
|
|
|
|
def gen_builder(insts, fmt):
|
|
"""
|
|
Generate a Builder trait with methods for all instructions.
|
|
"""
|
|
fmt.doc_comment("""
|
|
Convenience methods for building instructions.
|
|
|
|
The `InstrBuilder` trait has one method per instruction opcode for
|
|
conveniently constructing the instruction with minimum arguments.
|
|
Polymorphic instructions infer their result types from the input
|
|
arguments when possible. In some cases, an explicit `result_type`
|
|
or `ctrl_typevar` argument is required.
|
|
|
|
The opcode methods return the new instruction's result values, or
|
|
the `Inst` itself for instructions that don't have any results.
|
|
|
|
There is also a method per instruction format. These methods all
|
|
return an `Inst`.
|
|
""")
|
|
with fmt.indented(
|
|
"pub trait InstBuilder<'f>: InstBuilderBase<'f> {", '}'):
|
|
for inst in insts:
|
|
gen_inst_builder(inst, fmt)
|
|
for f in cretonne.InstructionFormat.all_formats:
|
|
gen_format_constructor(f, fmt)
|
|
|
|
|
|
def generate(isas, out_dir):
|
|
groups = collect_instr_groups(isas)
|
|
|
|
# opcodes.rs
|
|
fmt = srcgen.Formatter()
|
|
gen_formats(fmt)
|
|
gen_instruction_data_impl(fmt)
|
|
instrs = gen_opcodes(groups, fmt)
|
|
gen_type_constraints(fmt, instrs)
|
|
fmt.update_file('opcodes.rs', out_dir)
|
|
|
|
# builder.rs
|
|
fmt = srcgen.Formatter()
|
|
gen_builder(instrs, fmt)
|
|
fmt.update_file('builder.rs', out_dir)
|