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type
Snippet = string
Builder = string
template newBuilder(s: string): Builder =
s
proc addField(obj: var Builder; name, typ: Snippet; isFlexArray: bool = false; initializer: Snippet = "") =
obj.add('\t')
obj.add(typ)
obj.add(" ")
obj.add(name)
if isFlexArray:
obj.add("[SEQ_DECL_SIZE]")
if initializer.len != 0:
obj.add(initializer)
obj.add(";\n")
proc addField(obj: var Builder; field: PSym; name, typ: Snippet; isFlexArray: bool = false; initializer: Snippet = "") =
## for fields based on an `skField` symbol
obj.add('\t')
if field.alignment > 0:
obj.add("NIM_ALIGN(")
obj.addInt(field.alignment)
obj.add(") ")
obj.add(typ)
if sfNoalias in field.flags:
obj.add(" NIM_NOALIAS")
obj.add(" ")
obj.add(name)
if isFlexArray:
obj.add("[SEQ_DECL_SIZE]")
if field.bitsize != 0:
obj.add(":")
obj.addInt(field.bitsize)
if initializer.len != 0:
obj.add(initializer)
obj.add(";\n")
type
BaseClassKind = enum
bcNone, bcCppInherit, bcSupField, bcNoneRtti, bcNoneTinyRtti
StructBuilderInfo = object
baseKind: BaseClassKind
preFieldsLen: int
proc structOrUnion(t: PType): Snippet =
let t = t.skipTypes({tyAlias, tySink})
if tfUnion in t.flags: "union"
else: "struct"
proc ptrType(t: Snippet): Snippet =
t & "*"
proc startSimpleStruct(obj: var Builder; m: BModule; name: string; baseType: Snippet): StructBuilderInfo =
result = StructBuilderInfo(baseKind: bcNone)
obj.add("struct ")
obj.add(name)
if baseType.len != 0:
if m.compileToCpp:
result.baseKind = bcCppInherit
else:
result.baseKind = bcSupField
if result.baseKind == bcCppInherit:
obj.add(" : public ")
obj.add(baseType)
obj.add(" ")
obj.add("{\n")
result.preFieldsLen = obj.len
if result.baseKind == bcSupField:
obj.addField(name = "Sup", typ = baseType)
proc finishSimpleStruct(obj: var Builder; m: BModule; info: StructBuilderInfo) =
if info.baseKind == bcNone and info.preFieldsLen == obj.len:
# no fields were added, add dummy field
obj.addField(name = "dummy", typ = "char")
obj.add("};\n")
template addSimpleStruct(obj: var Builder; m: BModule; name: string; baseType: Snippet; body: typed) =
## for independent structs, not directly based on a Nim type
let info = startSimpleStruct(obj, m, name, baseType)
body
finishSimpleStruct(obj, m, info)
proc startStruct(obj: var Builder; m: BModule; t: PType; name: string; baseType: Snippet): StructBuilderInfo =
result = StructBuilderInfo(baseKind: bcNone)
if tfPacked in t.flags:
if hasAttribute in CC[m.config.cCompiler].props:
obj.add(structOrUnion(t))
obj.add(" __attribute__((__packed__))")
else:
obj.add("#pragma pack(push, 1)\n")
obj.add(structOrUnion(t))
else:
obj.add(structOrUnion(t))
obj.add(" ")
obj.add(name)
if t.kind == tyObject:
if t.baseClass == nil:
if lacksMTypeField(t):
result.baseKind = bcNone
elif optTinyRtti in m.config.globalOptions:
result.baseKind = bcNoneTinyRtti
else:
result.baseKind = bcNoneRtti
elif m.compileToCpp:
result.baseKind = bcCppInherit
else:
result.baseKind = bcSupField
elif baseType.len != 0:
if m.compileToCpp:
result.baseKind = bcCppInherit
else:
result.baseKind = bcSupField
if result.baseKind == bcCppInherit:
obj.add(" : public ")
obj.add(baseType)
obj.add(" ")
obj.add("{\n")
result.preFieldsLen = obj.len
case result.baseKind
of bcNone:
# rest of the options add a field or don't need it due to inheritance,
# we need to add the dummy field for uncheckedarray ahead of time
# so that it remains trailing
if t.itemId notin m.g.graph.memberProcsPerType and
t.n != nil and t.n.len == 1 and t.n[0].kind == nkSym and
t.n[0].sym.typ.skipTypes(abstractInst).kind == tyUncheckedArray:
# only consists of flexible array field, add *initial* dummy field
obj.addField(name = "dummy", typ = "char")
of bcCppInherit: discard
of bcNoneRtti:
obj.addField(name = "m_type", typ = ptrType(cgsymValue(m, "TNimType")))
of bcNoneTinyRtti:
obj.addField(name = "m_type", typ = ptrType(cgsymValue(m, "TNimTypeV2")))
of bcSupField:
obj.addField(name = "Sup", typ = baseType)
proc finishStruct(obj: var Builder; m: BModule; t: PType; info: StructBuilderInfo) =
if info.baseKind == bcNone and info.preFieldsLen == obj.len and
t.itemId notin m.g.graph.memberProcsPerType:
# no fields were added, add dummy field
obj.addField(name = "dummy", typ = "char")
obj.add("};\n")
if tfPacked in t.flags and hasAttribute notin CC[m.config.cCompiler].props:
obj.add("#pragma pack(pop)\n")
template addStruct(obj: var Builder; m: BModule; typ: PType; name: string; baseType: Snippet; body: typed) =
## for structs built directly from a Nim type
let info = startStruct(obj, m, typ, name, baseType)
body
finishStruct(obj, m, typ, info)
template addFieldWithStructType(obj: var Builder; m: BModule; parentTyp: PType; fieldName: string, body: typed) =
## adds a field with a `struct { ... }` type, building it according to `body`
obj.add('\t')
if tfPacked in parentTyp.flags:
if hasAttribute in CC[m.config.cCompiler].props:
obj.add("struct __attribute__((__packed__)) {\n")
else:
obj.add("#pragma pack(push, 1)\nstruct {")
else:
obj.add("struct {\n")
body
obj.add("} ")
obj.add(fieldName)
obj.add(";\n")
if tfPacked in parentTyp.flags and hasAttribute notin CC[m.config.cCompiler].props:
result.add("#pragma pack(pop)\n")
template addAnonUnion(obj: var Builder; body: typed) =
obj.add "union{\n"
body
obj.add("};\n")
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