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package dotty.tools.dotc
package core
package pickling
/************************************************************
Notation:
We use BNF notation. Terminal symbols start with at least two
consecutive upper case letters. Each terminal is represented as a
single byte tag. Non-terminals are mixed case. Prefixes of the form
lower case letter*_ are for explanation of semantic content only, they
can be dropped without changing the grammar.
Micro-syntax:
LongNat = Digit* StopDigit // big endian, value fits in a Long without overflow
Nat = LongNat // value fits in an Int without overflow
Digit = 0 | ... | 127
StopDigit = 128 | ... | 255 // value = digit - 128
FullInt = Byte Byte Byte Byte
FullLong = Byte Byte Byte Byte Byte Byte Byte Byte
Byte - 0 | ... | 255
Macro-format:
File = Header majorVersion_Nat minorVersion_Nat nameTable_Length Name* Section*
Header = "5CA1AB1F"
Section = NameRef Length Bytes
Length = Nat // length of rest of entry in bytes
Name = UTF8 Length UTF8-CodePoint*
QUALIFIED Length qualified_NameRef selector_NameRef
SIGNED Length original_NameRef resultSig_NameRef paramSig_NameRef*
EXPANDED Length original_NameRef
MODULECLASS Length module_NameRef
SUPERACCESSOR Length accessed_NameRef
DEFAULTGETTER Length method_NameRef paramNumber_Nat
...
NameRef = Nat // ordinal number of name in name table, starting from 1.
Note: Unqualified names in the name table are strings. The context decides whether a name is
a type-name or a term-name. The same string can represent both.
Standard-Section: "ASTs" Tree*
Tree = PACKAGE Length Path Tree*
Stat
Stat = Term
VALDEF Length NameRef Type rhs_Tree Modifier*
DEFDEF Length NameRef TypeParam* Params* return_Type rhs_Tree
Modifier*
TYPEDEF Length NameRef (Type | Template) Modifier*
IMPORT Length qual_Term Selector*
TypeParam = TYPEPARAM Length NameRef Type Modifier*
Params = PARAMS Length Param*
Param = PARAM Length NameRef Type Modifier
Selector = IMPORTED Length name_NameRef
RENAMED Length from_NameRef to_NameRef
Term = Path
SELECT qual_Term possiblySigned_NameRef
SUPER Length this_Term mixinTrait_Type?
APPLY Length fn_Term arg_Term*
TYPEAPPLY Length fn_Term arg_Term*
NEW Length cls_Type
PAIR Length left_Term right_Term
TYPED Length expr_Term ascription_Type
NAMEDARG Length paramName_NameRef arg_Term
ASSIGN Length lhs_Term rhs_Term
BLOCK Length expr_Term Stat*
IF Length cond_Term then_Term else_Term
CLOSURE Length meth_Term target_Type env_Term*
MATCH Length sel_Term CaseDef*
RETURN Length meth_ASTRef expr_Term?
TRY Length expr_Term CaseDef* finalizer_Term?
THROW Length expr_Term
SEQLITERAL Length elem_Term*
JSEQLITERAL Length elem_Term*
BIND Length boundName_NameRef pat_Type pat_Term
ALTERNATIVE Length alt_Term*
UNAPPLY Length fun_Term ImplicitArg* pat_Term*
ANNOTATED Length annot_Term underlying_Term
EMPTYTREE
CaseDef = CASEDEF Length pat_Tree guard_Tree rhs_Tree
ImplicitArg = IMPLICITARG Length arg_Tree
Template = TEMPLATE Length parent_Tree* SelfDef? Stat*
// if there is a primary constructor, it is the first statement in Stat*..
SelfDef = Param
ASTRef = Nat // byte position in AST payload
Path = Constant
TERMREFdirect sym_ASTRef
TERMREFsymbol qual_Type sym_ASTRef
TERMREF qual_Type possiblySigned_NameRef
THIS Length clsRef_Type
SHARED path_ASTRef
Constant = UNITconst
FALSEconst
TRUEconst
BYTEconst Nat
BYTEneg NegNat
SHORTconst Nat
SHORTneg NegNat
CHARconst Nat
INTconst Nat
INTneg NegNat
LONGconst LongNat
LONGneg NegLongNat
FLOATconst FullInt
DOUBLEconst FullLong
STRINGconst NameRef
NULLconst
CLASSconst Length Type
ENUMconst Length Path
NegNat = Nat // negValue = -natValue - 1
NegLongNat = LongNat // negValue = -natValue - 1
Type = Path
TYPEREFdirect sym_ASTRef
TYPEREFsymbol qual_Type sym_ASTRef
TYPEREF qual_Type possiblySigned_NameRef
SUPERtype Length this_Type underlying_Type
SKOLEMtype Length underlying_Type
REFINEDtype Length refinement_NameRef info_Type
APPLIEDtype Length tycon_Type arg_Type*
TYPEBOUNDS Length low_Type high_Type
TYPEALIAS Length alias_Type
ANNOTATED Length annot_Tree underlying_Type
ANDtype Length left_Type right_Type
ORtype Length left_Type right_Type
BYNAMEtype Length underlying_Type
NOTYPE
NOPREFIX
SHARED type_ASTRef
Modifier = PRIVATE
INTERNAL // package private
PROTECTED
PRIVATEqualified qualifier_ASTRef // will be dropped
PROTECTEDqualified qualifier_ASTRef // will be dropped
ABSTRACT
FINAL
SEALED
CASE
IMPLICIT
LAZY
OVERRIDE
INLINE
ABSOVERRIDE // abstract override
STATIC // mapped to static Java member
MODULE // an object or its class
LOCAL // private[this] or protected[this]
SYNTHETIC // generated by Scala compiler
ARTIFACT // to be tagged Java Synthetic
MUTABLE // a var
LABEL // method generated as a label
FIELDaccessor // getter or setter
PARAMaccessor // getter or setter for class param
CASEaccessor // getter for case class param
COVARIANT // type param marked “+”
CONTRAVARIANT // type param marked “-”
SCALA2X // Imported from Scala2.x
DEFAULTparameterized // Method with default params
DEFAULTinit // variable with “_” initializer
annotation_Term
Note: Tree tags are grouped into 4 categories that determine what follows, and thus allow to compute the size of the tagged tree in a generic way.
Category 1 (tags 0-95): tag
Category 2 (tags 96-127): tag Nat
Category 3 (tags 128-159): tag AST Nat
Category 4 (tags 160-255): tag Length <payload>
Standard Section: "Positions" startPos_Index endPos_Index
Index = Length Assoc*
Assoc = Delta ASTRef // largest tree starting/ending at offset
Delta = Nat // # chars from last offset or start of file
**************************************************************************************/
object PickleFormat {
final val header = "5CA1AB1F"
final val MajorVersion = 0
final val MinorVersion = 1
// Name tags
final val UTF8 = 1
final val QUALIFIED = 2
final val SIGNED = 3
final val EXPANDED = 4
final val MODULECLASS = 5
final val SUPERACCESSOR = 6
final val DEFAULTGETTER = 7
// AST tags
final val EMPTYTREE = 0
final val NOTYPE = 1
final val NOPREFIX = 2
final val UNITconst = 3
final val FALSEconst = 4
final val TRUEconst = 5
final val NULLconst = 6
final val PRIVATE = 7
final val INTERNAL = 8
final val PROTECTED = 9
final val ABSTRACT = 10
final val FINAL = 11
final val SEALED = 12
final val CASE = 13
final val IMPLICIT = 14
final val LAZY = 15
final val OVERRIDE = 16
final val INLINE = 17
final val ABSOVERRIDE = 18
final val STATIC = 19
final val MODULE = 20
final val LOCAL = 21
final val SYNTHETIC = 22
final val ARTIFACT = 23
final val MUTABLE = 24
final val LABEL = 25
final val FIELDaccessor = 26
final val PARAMaccessor = 27
final val CASEaccessor = 28
final val COVARIANT = 29
final val CONTRAVARIANT = 30
final val SCALA2X = 31
final val DEFAULTparameterized = 32
final val DEFAULTinit = 33
final val SHARED = 96
final val TERMREFdirect = 97
final val TYPEREFdirect = 98
final val BYTEconst = 99
final val BYTEneg = 100
final val SHORTconst = 101
final val SHORTneg = 102
final val CHARconst = 103
final val INTconst = 104
final val INTneg = 105
final val LONGconst = 106
final val LONGneg = 107
final val FLOATconst = 108
final val DOUBLEconst = 109
final val STRINGconst = 110
final val PRIVATEqualified = 111
final val PROTECTEDqualified = 112
final val SELECT = 128
final val TERMREFsymbol = 129
final val TERMREF = 130
final val TYPEREFsymbol = 131
final val TYPEREF = 132
final val PACKAGE = 160
final val VALDEF = 161
final val DEFDEF = 162
final val TYPEDEF = 163
final val IMPORT = 164
final val TYPEPARAM = 165
final val PARAMS = 166
final val PARAM = 167
final val IMPORTED = 168
final val RENAMED = 169
final val APPLY = 170
final val TYPEAPPLY = 171
final val NEW = 172
final val PAIR = 173
final val TYPED = 174
final val NAMEDARG = 175
final val ASSIGN = 176
final val BLOCK = 177
final val IF = 178
final val CLOSURE = 179
final val MATCH = 180
final val RETURN = 181
final val TRY = 182
final val THROW = 183
final val SEQLITERAL = 184
final val JSEQLITERAL = 185
final val BIND = 186
final val ALTERNATIVE = 187
final val UNAPPLY = 188
final val ANNOTATED = 189
final val CASEDEF = 190
final val IMPLICITarg = 191
final val TEMPLATE = 192
final val THIS = 193
final val SUPER = 194
final val CLASSconst = 195
final val ENUMconst = 196
final val SUPERtype = 197
final val SKOLEMtype = 198
final val REFINEDtype = 199
final val APPLIEDtype = 200
final val TYPEBOUNDS = 201
final val TYPEALIAS = 202
final val ANDtype = 203
final val ORtype = 204
final val BYNAMEtype = 205
final val IMPLICITARG = 206
final val firstSimpleTreeTag = EMPTYTREE
final val firstNatTreeTag = SHARED
final val firstTreeNatTreeTag = SELECT
final val firstLengthTreeTag = PACKAGE
}
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