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inlining
collectInlineList
"Make a list of methods that should be inlined."
"Details: The method must not include any inline C, since the translator cannot
currently map variable names in inlined C code. The #inline: directive may be
used to override this for cases in which the C code or declarations are harmless.
Methods to be inlined must be small or called from only one place."
| methodsNotToInline callsOf inlineIt hasCCode nodeCount senderCount
sel |
methodsNotToInline := Set new: methods size.
"build dictionary to record the number of calls to each method"
callsOf := Dictionary new: methods size * 2.
methods keys do: [ :s | callsOf at: s put: 0 ].
"For each method, scan its parse tree once to:
1. determine if the method contains C code or declarations
2. determine how many nodes it has
3. increment the sender counts of the methods it calls
4. determine if it includes any C declarations or code"
inlineList := Set new: methods size * 2.
methods do: [ :m |
inlineIt := #dontCare.
(translationDict includesKey: m selector) ifTrue: [
hasCCode := true.
] ifFalse: [
hasCCode := m declarations size > 0.
nodeCount := 0.
m parseTree nodesDo: [ :node |
node isSend ifTrue: [
sel := node selector.
(sel = #cCode: or: [sel = #cCode:inSmalltalk:])
ifTrue: [ hasCCode := true ].
senderCount := callsOf at: sel ifAbsent: [ nil ].
nil = senderCount ifFalse: [
callsOf at: sel put: senderCount + 1.
].
].
nodeCount := nodeCount + 1.
].
inlineIt := m extractInlineDirective. "may be true, false, or
#dontCare"
].
(inlineIt ~= true and: [hasCCode or: [inlineIt = false]]) ifTrue: [
"Don't inline if method has C code or if it contains a negative inline
directive. If it contains a positive inline directive, permit inlining even
if C code is present."
methodsNotToInline add: m selector.
] ifFalse: [
((nodeCount < 40) or: [inlineIt = true]) ifTrue: [
"inline if method has no C code and is either small or contains
inline directive"
inlineList add: m selector.
].
].
].
callsOf associationsDo: [ :assoc |
((assoc value = 1) and: [(methodsNotToInline includes: assoc key)
not]) ifTrue: [
inlineList add: assoc key.
].
]. |