0619d6f827
Use the meta language encoding recipes to generate an emit_inst() function for each ISA. The generated calls into recipe_*() functions that must be implemented by hand. Implement recipe_*() functions for the RISC-V recipes. Add the TargetIsa::emit_inst() entry point which emits an instruction to a CodeSink trait object.
47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
"""
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Generate binary emission code for each ISA.
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"""
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from __future__ import absolute_import
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import srcgen
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try:
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from typing import Sequence, List # noqa
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from cdsl.isa import TargetISA # noqa
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except ImportError:
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pass
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def gen_isa(isa, fmt):
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# type: (TargetISA, srcgen.Formatter) -> None
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"""
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Generate Binary emission code for `isa`.
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"""
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fmt.doc_comment(
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'''
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Emit binary machine code for `inst` for the {} ISA.
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'''.format(isa.name))
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if len(isa.all_recipes) == 0:
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# No encoding recipes: Emit a stub.
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with fmt.indented(
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'pub fn emit_inst<CS: CodeSink + ?Sized>'
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'(func: &Function, inst: Inst, _sink: &mut CS) {', '}'):
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fmt.line('bad_encoding(func, inst)')
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else:
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with fmt.indented(
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'pub fn emit_inst<CS: CodeSink + ?Sized>'
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'(func: &Function, inst: Inst, sink: &mut CS) {', '}'):
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with fmt.indented('match func.encodings[inst].recipe() {', '}'):
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for i, recipe in enumerate(isa.all_recipes):
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fmt.line('{} => recipe_{}(func, inst, sink),'.format(
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i, recipe.name.lower()))
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fmt.line('_ => bad_encoding(func, inst),')
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def generate(isas, out_dir):
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# type: (Sequence[TargetISA], str) -> None
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for isa in isas:
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fmt = srcgen.Formatter()
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gen_isa(isa, fmt)
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fmt.update_file('binemit-{}.rs'.format(isa.name), out_dir)
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