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decodetree: Propagate return value from translate subroutines 

Allow the translate subroutines to return false for invalid insns.

At present we can of course invoke an invalid insn exception from within
the translate subroutine, but in the short term this consolidates code.
In the long term it would allow the decodetree language to support
overlapping patterns for ISA extensions.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180227232618.2908-1-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2018-03-02 10:45:35 +00:00 committed by Peter Maydell
parent 08b2f15e67
commit 768055980b
1 changed files with 2 additions and 3 deletions
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5
scripts/decodetree.py
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@ -461,7 +461,7 @@ def output_decl(self):
global translate_prefix
output('typedef ', self.base.base.struct_name(),
' arg_', self.name, ';\n')
output(translate_scope, 'void ', translate_prefix, '_', self.name,
output(translate_scope, 'bool ', translate_prefix, '_', self.name,
'(DisasContext *ctx, arg_', self.name,
' *a, ', insntype, ' insn);\n')
@ -474,9 +474,8 @@ def output_code(self, i, extracted, outerbits, outermask):
output(ind, self.base.extract_name(), '(&u.f_', arg, ', insn);\n')
for n, f in self.fields.items():
output(ind, 'u.f_', arg, '.', n, ' = ', f.str_extract(), ';\n')
output(ind, translate_prefix, '_', self.name,
output(ind, 'return ', translate_prefix, '_', self.name,
'(ctx, &u.f_', arg, ', insn);\n')
output(ind, 'return true;\n')
# end Pattern