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9770ece187
Add support to the "read_verilog -sv" parser to validate the
"unique", "unique0", and "priority" keywords in contexts where
they're legal according to 1800-2012 12.4.2.
This affects only the grammar accepted; the behaviour of conditionals
is not changed. (But accepting this syntax will provide scope for
possible optimisations as future work.)
Three test cases ("unique_if", "unique_if_else", and
"unique_if_else_begin") verify that the keywords are accepted where
legal and rejected where illegal, as described in the final paragraph
of 12.4.2.
11 lines
340 B
Text
11 lines
340 B
Text
logger -expect error "unique keyword cannot be used for 'else if' branch" 1
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read_verilog -sv <<EOF
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module top( input[2:0] a );
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always_comb begin
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// invalid example from 1800-2012 12.4.2
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unique if ((a==0) || (a==1)) $display("0 or 1");
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else unique if (a == 2) $display("2");
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else if (a == 4) $display("4");
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end
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endmodule
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EOF
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