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generate: Add "stub" for actually generating branch functions

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This commit is contained in:
Sasha Koshka 2025-08-04 16:01:50 -04:00
parent 711ac30486
commit 7dcfc08678
1 changed files with 46 additions and 9 deletions
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55
generate/generate.go
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@ -87,7 +87,13 @@ func (this *Generator) Generate(protocol *Protocol) (n int, err error) {
n += nn; if err != nil { return n, err }
}
// TODO: pull items from the request queue
// request queue
for {
hash, typ, ok := this.pullDecodeBranchRequest()
if !ok { break }
nn, err := this.generateDecodeBranch(hash, typ)
n += nn; if err != nil { return n, err }
}
return n, nil
}
@ -491,7 +497,7 @@ func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource stri
}
case TypeArray:
// OTA: <length: UN> <elementTag: tape.Tag> <values>*
nn, err := this.generateDecodeBranch(typ, valueSource, tagSource)
nn, err := this.generateDecodeBranchCall(typ, valueSource, tagSource)
n += nn; if err != nil { return n, err }
case TypeTable:
// KTV: <length: UN> (<key: U16> <tag: Tag> <value>)*
@ -503,7 +509,7 @@ func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource stri
n += nn; if err != nil { return n, err }
case TypeTableDefined:
// KTV: <length: UN> (<key: U16> <tag: Tag> <value>)*
nn, err := this.generateDecodeBranch(typ, valueSource, tagSource)
nn, err := this.generateDecodeBranchCall(typ, valueSource, tagSource)
n += nn; if err != nil { return n, err }
case TypeNamed:
// WHATEVER: [WHATEVER]
@ -518,8 +524,7 @@ func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource stri
return n, nil
}
// generateDencodeValue generates code to call an aggregate decoder function,
// generateDecodeBranchCall generates code to call an aggregate decoder function,
// for a specified type. The definition of the function is deferred so no
// duplicates are created. The function overwrites memory pointed to by the
// variable (or parenthetical statement) specified by valueSource, and the value
@ -531,10 +536,9 @@ func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource stri
// - n int
// - err error
// - nn int
func (this *Generator) generateDecodeBranch(typ Type, valueSource, tagSource string) (n int, err error) {
hash := (HashType(typ))
hashString := hex.EncodeToString(hash[:])
nn, err := this.iprintf("nn, err = decodeBranch_%(%s, %s)\n", hashString, valueSource, tagSource)
func (this *Generator) generateDecodeBranchCall(typ Type, valueSource, tagSource string) (n int, err error) {
hash := HashType(typ)
nn, err := this.iprintf("nn, err = %s(%s, %s)\n", this.decodeBranchName(hash), valueSource, tagSource)
n += nn; if err != nil { return n, err }
nn, err = this.generateErrorCheck()
n += nn; if err != nil { return n, err }
@ -542,6 +546,37 @@ func (this *Generator) generateDecodeBranch(typ Type, valueSource, tagSource str
return n, nil
}
// generateDecodeBranch generates an aggregate decoder function definition for a
// specified type. It assumes that hash == HashType(typ).
func (this *Generator) generateDecodeBranch(hash [16]byte, typ Type) (n int, err error) {
nn, err := this.iprintf("func %s(this *", this.decodeBranchName(hash))
n += nn; if err != nil { return n, err }
nn, err = this.generateType(typ)
n += nn; if err != nil { return n, err }
nn, err = this.printf(" decoder *tape.Decoder, tag tape.Tag) (nn int, err error) \n{")
n += nn; if err != nil { return n, err }
switch typ := typ.(type) {
case TypeArray:
// OTA: <length: UN> <elementTag: tape.Tag> <values>*
case TypeTableDefined:
// KTV: <length: UN> (<key: U16> <tag: Tag> <value>)*
// TODO
default: return n, fmt.Errorf("unexpected type: %T", typ)
}
nn, err = this.iprintf("}")
n += nn; if err != nil { return n, err }
return n, nil
}
func (this *Generator) decodeBranchName(hash [16]byte) string {
return fmt.Sprintf("decodeBranch_%s", hex.EncodeToString(hash[:]))
}
// pushDecodeBranchRequest pushes a new branch decode function request to the
// back of the queue, if it is not already in the queue.
func (this *Generator) pushDecodeBranchRequest(hash [16]byte, typ Type) {
for _, item := range this.decodeBranchRequestQueue {
if item.hash == hash { return }
@ -552,6 +587,8 @@ func (this *Generator) pushDecodeBranchRequest(hash [16]byte, typ Type) {
})
}
// pullDecodeBranchRequest pulls a branch decode function request from the front
// of the queue.
func (this *Generator) pullDecodeBranchRequest() (hash [16]byte, typ Type, ok bool) {
if len(this.decodeBranchRequestQueue) < 1 {
return [16]byte { }, nil, false