Codegen refactoring [1/x]: Introduced a PPCCodeBlock
A PPCCodeBlock is an abstraction of a block of statements with temporaries. This will
allow for scoped temporary management in code generator - temporary variables could
be allocated for block only. (i.e., make them block-temporaries)
"{ Package: 'stx:goodies/petitparser/compiler' }"
"{ NameSpace: Smalltalk }"
PPCCodeGenerator subclass:#PPCTokenizingCodeGenerator
instanceVariableNames:'tokenGenerator'
classVariableNames:''
poolDictionaries:''
category:'PetitCompiler-Visitors'
!
!PPCTokenizingCodeGenerator methodsFor:'accessing'!
guards
"When tokenizing, do not use guards"
^ false
!
tokenGenerator
tokenGenerator isNil ifTrue: [
tokenGenerator := PPCTokenCodeGenerator on: compiler.
tokenGenerator arguments: arguments.
].
^ tokenGenerator
!
tokenGenerator: whatever
tokenGenerator := whatever
!
tokenGuards
"When tokenizing, do not use guards"
^ arguments guards
! !
!PPCTokenizingCodeGenerator methodsFor:'guards'!
addGuard: node ifTrue: trueBlock ifFalse: falseBlock
| guard id |
guard := PPCTokenGuard on: node.
(self guards not or: guard makesSense not) ifTrue: [ ^ false ].
id := compiler idFor: guard firstToken.
compiler add: 'self ', id asString.
trueBlock isNil ifFalse: [
compiler addOnLine: ' ifTrue: ['.
compiler indent.
trueBlock value.
compiler dedent.
falseBlock isNil ifTrue: [ compiler addOnLine: '].' ]
ifFalse: [ compiler add: ']'. ]
].
falseBlock isNil ifFalse: [
compiler addOnLine: ' ifFalse: ['.
compiler indent.
falseBlock value.
compiler dedent.
compiler addOnLine: '].'.
].
^ true
! !
!PPCTokenizingCodeGenerator methodsFor:'visiting'!
visitAndNode: node
| mementoVar currentTokenVar |
mementoVar := compiler allocateTemporaryVariableNamed: 'memento'.
currentTokenVar := compiler allocateTemporaryVariableNamed: 'currentToken'.
compiler smartRemember: node child to: mementoVar.
compiler codeAssign: '{ currentTokenValue . currentTokenType }.' to: currentTokenVar.
compiler codeStoreValueOf: [ self visit: node child ] intoVariable: self retvalVar.
compiler smartRestore: node child from: mementoVar.
compiler codeAssign: '(', currentTokenVar, ' at: 1).' to: 'currentTokenValue'.
compiler codeAssign: '(', currentTokenVar, ' at: 2).' to: 'currentTokenType'.
compiler codeReturn.
!
visitChoiceNode: node
" true ifTrue: [ ^ super visitChoiceNode: node ]."
| possibleError |
possibleError := true.
node children do: [ :child |
| tokenMethodName |
child acceptsEpsilon ifTrue: [
possibleError := false.
compiler codeStoreValueOf: [ self visit: child ] intoVariable: self retvalVar.
compiler codeReturn
] ifFalse: [
child firstSetWithTokens do: [ :first |
"For each child, for each first compile this:"
tokenMethodName := compiler idFor: first.
compiler add: '(self ', tokenMethodName asString, ')'.
compiler addOnLine: ' ifTrue: ['.
compiler indent.
compiler codeStoreValueOf: [ self visit: child ] intoVariable: self retvalVar.
compiler add: 'error ifFalse: ['.
compiler indent.
compiler codeReturn: self retvalVar.
compiler dedent.
compiler add: '] ifTrue: ['.
compiler indent.
compiler codeClearError.
compiler codeAssign: 'nil.' to: 'currentTokenType'.
compiler add: 'context position: currentTokenValue start - 1.'.
compiler dedent.
compiler add: ']'.
compiler dedent.
compiler add: '].'
]
]
].
possibleError ifTrue: [
compiler codeError: 'no choice found'.
]
"Modified: / 10-05-2015 / 07:37:53 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!
visitDeterministicChoiceNode: node
| dictionary |
dictionary := IdentityDictionary new.
node children do: [ :child |
| firstSet |
firstSet := child firstSetWithTokens.
self assert: firstSet size = 1.
dictionary at: child put: firstSet anyOne.
].
"Tokens are unique"
self assert: dictionary values asSet size = node children size.
node children do: [ :child |
| tokenMethodName |
tokenMethodName := compiler idFor: (dictionary at: child).
compiler add: '(self ', tokenMethodName asString, ')'.
compiler addOnLine: ' ifTrue: ['.
compiler indent.
compiler codeStoreValueOf: [ self visit: child ] intoVariable: self retvalVar.
compiler codeReturn: self retvalVar.
compiler dedent.
compiler add: '] ifFalse:['
].
compiler codeError: 'no choice found'.
node children size timesRepeat: [ compiler add: ']' ].
compiler add: '.'.
"Modified: / 21-05-2015 / 15:31:26 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!
visitTokenChoiceNode: node
| trimmingToken |
self assert: (node children allSatisfy: [ :e | e isMarkedForInline not ]).
node children do: [ :child |
self tokenGenerator visit: child
]
"
trimmingToken := node children detect: [ :e | e isTrimmingTokenNode ] ifNone: [ nil ].
trimmingToken isNil ifFalse: [
compiler codeStoreValueOf: [ self visit: trimmingToken whitespace ] intoVariable: #whatever.
].
super visitChoiceNode: node."
!
visitTokenConsumeNode: node
| id |
id := (compiler idFor: node child).
compiler add: 'self ', id asString, ' ifTrue: ['.
compiler indent.
compiler codeAssign: 'nil.' to: 'currentTokenType'.
compiler codeReturn: 'currentTokenValue'.
compiler dedent.
compiler add: '] ifFalse: ['.
compiler indent.
compiler codeError: id asString, ' expected'.
compiler dedent.
compiler add: '].'.
"
compiler codeReturn: 'self consume: ', (compiler idFor: node child) storeString, '.'
"
!
visitTokenNode: node
self error: 'shoudl not happend!!'
!
visitTokenizingParserNode: node
self visit: node tokenizer.
self visit: node whitespace.
compiler codeHaltIfShiftPressed.
compiler codeStoreValueOf: [ self visit: node parser ] intoVariable: self retvalVar.
compiler codeReturn.
!
visitTrimmingTokenNode: node
self error: 'shoudl not happend!!'
! !
!PPCTokenizingCodeGenerator class methodsFor:'documentation'!
version_HG
^ '$Changeset: <not expanded> $'
! !