! Copyright (C) 2004, 2010 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: slots arrays definitions generic hashtables summary io
kernel math namespaces make prettyprint prettyprint.config
sequences assocs sequences.private strings io.styles
io.pathnames vectors words system splitting math.parser
classes.mixin classes.tuple continuations continuations.private
combinators generic.math classes.builtin classes compiler.units
generic.standard generic.single vocabs init kernel.private
io.encodings accessors math.order destructors source-files
parser classes.tuple.parser effects.parser lexer generic.parser
strings.parser vocabs.loader vocabs.parser source-files.errors ;
IN: debugger

GENERIC: error-help ( error -- topic )

M: object error-help drop f ;

M: tuple error-help class ;

M: source-file-error error-help error>> error-help ;

GENERIC: error. ( error -- )

M: object error. short. ;

M: string error. print ;

: traceback-link. ( continuation -- )
    "[" write [ "Traceback" ] dip write-object "]" print ;

: :s ( -- )
    error-continuation get data>> stack. ;

: :r ( -- )
    error-continuation get retain>> stack. ;

: :c ( -- )
    error-continuation get call>> callstack. ;

: :get ( variable -- value )
    error-continuation get name>> assoc-stack ;

: :res ( n -- * )
    1 - restarts get-global nth f restarts set-global restart ;

: :1 ( -- * ) 1 :res ;
: :2 ( -- * ) 2 :res ;
: :3 ( -- * ) 3 :res ;

: restart. ( restart n -- )
    [
        1 + dup 3 <= [ ":" % # "      " % ] [ # " :res  " % ] if
        name>> %
    ] "" make print ;

: restarts. ( -- )
    restarts get [
        nl
        "The following restarts are available:" print
        nl
        [ restart. ] each-index
    ] unless-empty ;

: print-error ( error -- )
    [ error. flush ] curry
    [ global [ "Error in print-error!" print drop ] bind ]
    recover ;

: :error ( -- )
    error get print-error ;

: print-error-and-restarts ( error -- )
    print-error
    restarts.
    nl
    "Type :help for debugging help." print flush ;

: try ( quot -- )
    [ print-error-and-restarts ] recover ; inline

: expired-error. ( obj -- )
    "Object did not survive image save/load: " write third . ;

: io-error. ( error -- )
    "I/O error #" write third . ;

: type-check-error. ( obj -- )
    "Type check error" print
    "Object: " write dup fourth short.
    "Object type: " write dup fourth class .
    "Expected type: " write third type>class . ;

: divide-by-zero-error. ( obj -- )
    "Division by zero" print drop ;

HOOK: signal-error. os ( obj -- )

: array-size-error. ( obj -- )
    "Invalid array size: " write dup third .
    "Maximum: " write fourth 1 - . ;

: c-string-error. ( obj -- )
    "Cannot convert to C string: " write third . ;

: ffi-error. ( obj -- )
    "FFI error" print drop ;

: undefined-symbol-error. ( obj -- )
    "The image refers to a library or symbol that was not found at load time"
    print drop ;

: stack-underflow. ( obj name -- )
    write " stack underflow" print drop ;

: stack-overflow. ( obj name -- )
    write " stack overflow" print drop ;

: datastack-underflow. ( obj -- ) "Data" stack-underflow. ;
: datastack-overflow. ( obj -- ) "Data" stack-overflow. ;
: retainstack-underflow. ( obj -- ) "Retain" stack-underflow. ;
: retainstack-overflow. ( obj -- ) "Retain" stack-overflow. ;
: callstack-underflow. ( obj -- ) "Call" stack-underflow. ;
: callstack-overflow. ( obj -- ) "Call" stack-overflow. ;

: memory-error. ( error -- )
    "Memory protection fault at address " write third .h ;

: primitive-error. ( error -- ) 
    "Unimplemented primitive" print drop ;

: fp-trap-error. ( error -- )
    "Floating point trap" print drop ;

PREDICATE: vm-error < array
    {
        { [ dup empty? ] [ drop f ] }
        { [ dup first "kernel-error" = not ] [ drop f ] }
        [ second 0 17 between? ]
    } cond ;

: vm-errors ( error -- n errors )
    second {
        { 0  [ expired-error.          ] }
        { 1  [ io-error.               ] }
        { 2  [ primitive-error.        ] }
        { 3  [ type-check-error.       ] }
        { 4  [ divide-by-zero-error.   ] }
        { 5  [ signal-error.           ] }
        { 6  [ array-size-error.       ] }
        { 7  [ c-string-error.         ] }
        { 8  [ ffi-error.              ] }
        { 9  [ undefined-symbol-error. ] }
        { 10 [ datastack-underflow.    ] }
        { 11 [ datastack-overflow.     ] }
        { 12 [ retainstack-underflow.  ] }
        { 13 [ retainstack-overflow.   ] }
        { 14 [ callstack-underflow.    ] }
        { 15 [ callstack-overflow.     ] }
        { 16 [ memory-error.           ] }
        { 17 [ fp-trap-error.          ] }
    } ; inline

M: vm-error summary drop "VM error" ;

M: vm-error error. dup vm-errors case ;

M: vm-error error-help vm-errors at first ;

M: no-method summary
    drop "No suitable method" ;

M: no-method error.
    "Generic word " write
    dup generic>> pprint
    " does not define a method for the " write
    dup object>> class pprint
    " class." print
    "Dispatching on object: " write object>> short. ;

M: bad-slot-value summary drop "Bad store to specialized slot" ;

M: bad-slot-name summary drop "Bad slot name in object literal" ;

M: no-math-method summary
    drop "No suitable arithmetic method" ;

M: no-next-method summary
    drop "Executing call-next-method from least-specific method" ;

M: inconsistent-next-method summary
    drop "Executing call-next-method with inconsistent parameters" ;

M: check-method summary
    drop "Invalid parameters for create-method" ;

M: not-a-tuple summary
    drop "Not a tuple" ;

M: bad-superclass summary
    drop "Tuple classes can only inherit from non-final tuple classes" ;

M: no-initial-value summary
    drop "Initial value must be provided for slots specialized to this class" ;

M: bad-initial-value summary
    drop "Incompatible initial value" ;

M: no-cond summary
    drop "Fall-through in cond" ;

M: no-case summary
    drop "Fall-through in case" ;

M: slice-error summary
    drop "Cannot create slice" ;

M: bounds-error summary drop "Sequence index out of bounds" ;

M: condition error. error>> error. ;

M: condition summary error>> summary ;

M: condition error-help error>> error-help ;

M: assert summary drop "Assertion failed" ;

M: assert-sequence summary drop "Assertion failed" ;

M: assert-sequence error.
    standard-table-style [
        [ "=== Expected:" print expected>> stack. ]
        [ "=== Got:" print got>> stack. ] bi
    ] tabular-output ;

M: immutable summary drop "Sequence is immutable" ;

M: redefine-error error.
    "Re-definition of " write
    def>> . ;

M: undefined summary
    word>> undefined?
    "Cannot execute a deferred word before it has been defined"
    "Cannot execute a word before it has been compiled"
    ? ;

M: no-compilation-unit error.
    "Attempting to define " write
    definition>> pprint
    " outside of a compilation unit" print ;

M: no-vocab summary
    drop "Vocabulary does not exist" ;

M: encode-error summary drop "Character encoding error" ;

M: decode-error summary drop "Character decoding error" ;

M: bad-create summary drop "Bad parameters to create" ;

M: cannot-be-inline summary drop "This type of word cannot be inlined" ;

M: attempt-all-error summary drop "Nothing to attempt" ;

M: already-disposed summary drop "Attempting to operate on disposed object" ;

M: no-current-vocab summary
    drop "Not in a vocabulary; IN: form required" ;

M: no-word-error summary
    name>>
    "No word named “"
    "” found in current vocabulary search path" surround ;

M: no-word-error error. summary print ;

M: no-word-in-vocab summary
    [ vocab>> ] [ word>> ] bi
    [ "No word named “" % % "” found in “" % % "” vocabulary" % ] "" make ;

M: no-word-in-vocab error. summary print ;

M: ambiguous-use-error summary
    words>> first name>>
    "More than one vocabulary defines a word named “" "”" surround ;

M: ambiguous-use-error error. summary print ;

M: staging-violation summary
    drop
    "A parsing word cannot be used in the same file it is defined in." ;

M: bad-number summary
    drop "Bad number literal" ;

M: duplicate-slot-names summary
    drop "Duplicate slot names" ;

M: invalid-slot-name summary
    drop "Invalid slot name" ;

M: bad-inheritance summary
    drop "Circularity in inheritance chain" ;

M: not-in-a-method-error summary
    drop "call-next-method can only be called in a method definition" ;

M: version-control-merge-conflict summary
    drop "Version control merge conflict in source code" ;

GENERIC: expected>string ( obj -- str )

M: f expected>string drop "end of input" ;
M: word expected>string name>> ;
M: string expected>string ;

M: unexpected error.
    "Expected " write
    dup want>> expected>string write
    " but got " write
    got>> expected>string print ;

M: lexer-error error.
    [ lexer-dump ] [ error>> error. ] bi ;

M: lexer-error summary
    error>> summary ;

M: lexer-error compute-restarts
    error>> compute-restarts ;

M: lexer-error error-help
    error>> error-help ;

M: bad-effect summary
    drop "Bad stack effect declaration" ;

M: invalid-row-variable summary
    drop "Stack effect row variables can only occur as the first input or output" ;

M: row-variable-can't-have-type summary
    drop "Stack effect row variables cannot have a declared type" ;

M: bad-escape error.
    "Bad escape code: \\" write
    char>> 1string print ;

M: bad-literal-tuple summary drop "Bad literal tuple" ;

M: check-mixin-class summary drop "Not a mixin class" ;

M: not-found-in-roots summary drop "Cannot resolve vocab: path" ;

M: wrong-values summary drop "Quotation's stack effect does not match call site" ;

M: stack-effect-omits-dashes summary drop "Stack effect must contain “--”" ;