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(.module:
[library
[lux (#- Code)
[abstract
[equivalence (#+ Equivalence)]]
[data
["." product]
["." binary (#+ Binary)]
[format
[".F" binary (#+ Writer) ("#\." monoid)]]
[collection
["." row (#+ Row) ("#\." functor fold)]]]
[math
[number
["n" nat]]]]]
["." /// #_
[bytecode
[environment
["#." limit (#+ Limit)]]]
[encoding
["#." unsigned (#+ U2)]]]
["." / #_
["#." exception (#+ Exception)]])
(type: .public (Code Attribute)
{#limit Limit
#code Binary
#exception_table (Row Exception)
#attributes (Row Attribute)})
(def: .public (length length code)
(All [Attribute] (-> (-> Attribute Nat) (Code Attribute) Nat))
($_ n.+
... u2 max_stack;
... u2 max_locals;
///limit.length
... u4 code_length;
///unsigned.bytes/4
... u1 code[code_length];
(binary.size (value@ #code code))
... u2 exception_table_length;
///unsigned.bytes/2
... exception_table[exception_table_length];
(|> code
(value@ #exception_table)
row.size
(n.* /exception.length))
... u2 attributes_count;
///unsigned.bytes/2
... attribute_info attributes[attributes_count];
(|> code
(value@ #attributes)
(row\map length)
(row\fold n.+ 0))))
(def: .public (equivalence attribute_equivalence)
(All [attribute]
(-> (Equivalence attribute) (Equivalence (Code attribute))))
($_ product.equivalence
///limit.equivalence
binary.equivalence
(row.equivalence /exception.equivalence)
(row.equivalence attribute_equivalence)
))
... https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.3
(def: .public (writer writer code)
(All [Attribute] (-> (Writer Attribute) (Writer (Code Attribute))))
($_ binaryF\compose
... u2 max_stack;
... u2 max_locals;
(///limit.writer (value@ #limit code))
... u4 code_length;
... u1 code[code_length];
(binaryF.binary/32 (value@ #code code))
... u2 exception_table_length;
... exception_table[exception_table_length];
((binaryF.row/16 /exception.writer) (value@ #exception_table code))
... u2 attributes_count;
... attribute_info attributes[attributes_count];
((binaryF.row/16 writer) (value@ #attributes code))
))
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