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resolveDescriptors.ts
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resolveDescriptors.ts
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import {
AstConstantDef,
AstFieldDecl,
AstContractInit,
AstNativeFunctionDecl,
AstNode,
AstType,
createAstNode,
idText,
AstId,
eqNames,
AstFunctionDef,
isSelfId,
isSlice,
AstFunctionDecl,
AstConstantDecl,
AstExpression,
AstMapType,
AstTypeId,
AstAsmFunctionDef,
} from "../grammar/ast";
import { traverse } from "../grammar/iterators";
import {
idTextErr,
throwCompilationError,
throwInternalCompilerError,
} from "../errors";
import { CompilerContext, Store, createContextStore } from "../context";
import {
ConstantDescription,
FieldDescription,
FunctionParameter,
FunctionDescription,
InitParameter,
InitDescription,
printTypeRef,
ReceiverSelector,
receiverSelectorName,
TypeDescription,
TypeRef,
typeRefEquals,
} from "./types";
import { getRawAST } from "../grammar/store";
import { cloneNode } from "../grammar/clone";
import { crc16 } from "../utils/crc16";
import { evalConstantExpression } from "../constEval";
import { resolveABIType, intMapFormats } from "./resolveABITypeRef";
import { enabledExternals } from "../config/features";
import { isRuntimeType } from "./isRuntimeType";
import { GlobalFunctions } from "../abi/global";
import { ItemOrigin } from "../grammar/grammar";
import { getExpType, resolveExpression } from "./resolveExpression";
import { emptyContext } from "./resolveStatements";
import { isAssignable } from "./subtyping";
import { getMethodId } from "../utils/utils";
const store = createContextStore<TypeDescription>();
const staticFunctionsStore = createContextStore<FunctionDescription>();
const staticConstantsStore = createContextStore<ConstantDescription>();
// this function does not handle the case of structs
function verifyMapAsAnnotationsForPrimitiveTypes(
type: AstTypeId,
asAnnotation: AstId | null,
): void {
switch (idText(type)) {
case "Int": {
if (
asAnnotation !== null &&
!Object.keys(intMapFormats).includes(idText(asAnnotation))
) {
throwCompilationError(
'Invalid `as`-annotation for type "Int" type',
asAnnotation.loc,
);
}
return;
}
case "Address":
case "Bool":
case "Cell": {
if (asAnnotation !== null) {
throwCompilationError(
`${idTextErr(type)} type cannot have as-annotation`,
asAnnotation.loc,
);
}
return;
}
default: {
throwInternalCompilerError("Unsupported map type", type.loc);
}
}
}
function verifyMapTypes(
typeId: AstTypeId,
asAnnotation: AstId | null,
allowedTypeNames: string[],
): void {
if (!allowedTypeNames.includes(idText(typeId))) {
throwCompilationError(
"Invalid map type. Check https://docs.tact-lang.org/book/maps#allowed-types",
typeId.loc,
);
}
verifyMapAsAnnotationsForPrimitiveTypes(typeId, asAnnotation);
}
function verifyMapType(mapTy: AstMapType, isValTypeStruct: boolean) {
// optional and other compound key and value types are disallowed at the level of grammar
// check allowed key types
verifyMapTypes(mapTy.keyType, mapTy.keyStorageType, ["Int", "Address"]);
// check allowed value types
if (isValTypeStruct && mapTy.valueStorageType === null) {
return;
}
// the case for struct/message is already checked
verifyMapTypes(mapTy.valueType, mapTy.valueStorageType, [
"Int",
"Address",
"Bool",
"Cell",
]);
}
export const toBounced = (type: string) => `${type}%%BOUNCED%%`;
export function resolveTypeRef(ctx: CompilerContext, type: AstType): TypeRef {
switch (type.kind) {
case "type_id": {
const t = getType(ctx, idText(type));
return {
kind: "ref",
name: t.name,
optional: false,
};
}
case "optional_type": {
if (type.typeArg.kind !== "type_id") {
throwInternalCompilerError(
"Only optional type identifiers are supported now",
type.typeArg.loc,
);
}
const t = getType(ctx, idText(type.typeArg));
return {
kind: "ref",
name: t.name,
optional: true,
};
}
case "map_type": {
const keyTy = getType(ctx, idText(type.keyType));
const valTy = getType(ctx, idText(type.valueType));
verifyMapType(type, valTy.kind === "struct");
return {
kind: "map",
key: keyTy.name,
keyAs:
type.keyStorageType !== null
? idText(type.keyStorageType)
: null,
value: valTy.name,
valueAs:
type.valueStorageType !== null
? idText(type.valueStorageType)
: null,
};
}
case "bounced_message_type": {
const t = getType(ctx, idText(type.messageType));
return {
kind: "ref_bounced",
name: t.name,
};
}
}
}
function buildTypeRef(
type: AstType,
types: Map<string, TypeDescription>,
): TypeRef {
switch (type.kind) {
case "type_id": {
if (!types.has(idText(type))) {
throwCompilationError(
`Type ${idTextErr(type)} not found`,
type.loc,
);
}
return {
kind: "ref",
name: idText(type),
optional: false,
};
}
case "optional_type": {
if (type.typeArg.kind !== "type_id") {
throwInternalCompilerError(
"Only optional type identifiers are supported now",
type.typeArg.loc,
);
}
if (!types.has(idText(type.typeArg))) {
throwCompilationError(
`Type ${idTextErr(type.typeArg)} not found`,
type.loc,
);
}
return {
kind: "ref",
name: idText(type.typeArg),
optional: true,
};
}
case "map_type": {
if (!types.has(idText(type.keyType))) {
throwCompilationError(
`Type ${idTextErr(type.keyType)} not found`,
type.loc,
);
}
if (!types.has(idText(type.valueType))) {
throwCompilationError(
`Type ${idTextErr(type.valueType)} not found`,
type.loc,
);
}
const valTy = types.get(idText(type.valueType))!;
verifyMapType(type, valTy.kind === "struct");
return {
kind: "map",
key: idText(type.keyType),
keyAs:
type.keyStorageType !== null
? idText(type.keyStorageType)
: null,
value: idText(type.valueType),
valueAs:
type.valueStorageType !== null
? idText(type.valueStorageType)
: null,
};
}
case "bounced_message_type": {
return {
kind: "ref_bounced",
name: idText(type.messageType),
};
}
}
}
function uidForName(name: string, types: Map<string, TypeDescription>) {
// Resolve unique typeid from crc16
let uid = crc16(name);
while (Array.from(types.values()).find((v) => v.uid === uid)) {
uid = (uid + 1) % 65536;
}
return uid;
}
export function resolveDescriptors(ctx: CompilerContext) {
const types: Map<string, TypeDescription> = new Map();
const staticFunctions: Map<string, FunctionDescription> = new Map();
const staticConstants: Map<string, ConstantDescription> = new Map();
const ast = getRawAST(ctx);
//
// Register types
//
for (const a of ast.types) {
if (types.has(idText(a.name))) {
throwCompilationError(
`Type "${idText(a.name)}" already exists`,
a.loc,
);
}
const uid = uidForName(idText(a.name), types);
switch (a.kind) {
case "primitive_type_decl":
{
types.set(idText(a.name), {
kind: "primitive_type_decl",
origin: a.loc.origin,
name: idText(a.name),
uid,
fields: [],
traits: [],
header: null,
tlb: null,
signature: null,
functions: new Map(),
receivers: [],
dependsOn: [],
init: null,
ast: a,
interfaces: [],
constants: [],
partialFieldCount: 0,
});
}
break;
case "contract":
{
types.set(idText(a.name), {
kind: "contract",
origin: a.loc.origin,
name: idText(a.name),
uid,
header: null,
tlb: null,
fields: [],
traits: [],
signature: null,
functions: new Map(),
receivers: [],
dependsOn: [],
init: null,
ast: a,
interfaces: a.attributes.map((v) => v.name.value),
constants: [],
partialFieldCount: 0,
});
}
break;
case "struct_decl":
case "message_decl":
{
types.set(idText(a.name), {
kind: "struct",
origin: a.loc.origin,
name: idText(a.name),
uid,
header: null,
tlb: null,
signature: null,
fields: [],
traits: [],
functions: new Map(),
receivers: [],
dependsOn: [],
init: null,
ast: a,
interfaces: [],
constants: [],
partialFieldCount: 0,
});
}
break;
case "trait": {
types.set(idText(a.name), {
kind: "trait",
origin: a.loc.origin,
name: idText(a.name),
uid,
header: null,
tlb: null,
signature: null,
fields: [],
traits: [],
functions: new Map(),
receivers: [],
dependsOn: [],
init: null,
ast: a,
interfaces: a.attributes.map((v) => v.name.value),
constants: [],
partialFieldCount: 0,
});
}
}
}
//
// Resolve fields
//
function buildFieldDescription(
src: AstFieldDecl,
index: number,
): FieldDescription {
const fieldTy = buildTypeRef(src.type, types);
// Check if field is runtime type
if (isRuntimeType(fieldTy)) {
throwCompilationError(
printTypeRef(fieldTy) +
" is a runtime only type and can't be used as field",
src.loc,
);
}
// Resolve abi type
const type = resolveABIType(src);
return {
name: idText(src.name),
type: fieldTy,
index,
as: src.as !== null ? idText(src.as) : null,
default: undefined, // initializer will be evaluated after typechecking
loc: src.loc,
ast: src,
abi: { name: idText(src.name), type },
};
}
function buildConstantDescription(
src: AstConstantDef | AstConstantDecl,
): ConstantDescription {
const constDeclTy = buildTypeRef(src.type, types);
return {
name: idText(src.name),
type: constDeclTy,
value: undefined, // initializer will be evaluated after typechecking
loc: src.loc,
ast: src,
};
}
for (const a of ast.types) {
// Contract
if (a.kind === "contract") {
for (const f of a.declarations) {
if (f.kind === "field_decl") {
if (
types
.get(idText(a.name))!
.fields.find((v) => eqNames(v.name, f.name))
) {
throwCompilationError(
`Field ${idTextErr(f.name)} already exists`,
f.loc,
);
}
if (
types
.get(idText(a.name))!
.constants.find((v) => eqNames(v.name, f.name))
) {
throwCompilationError(
`Constant ${idText(f.name)} already exists`,
f.loc,
);
}
types
.get(idText(a.name))!
.fields.push(
buildFieldDescription(
f,
types.get(idText(a.name))!.fields.length,
),
);
} else if (f.kind === "constant_def") {
if (
types
.get(idText(a.name))!
.fields.find((v) => eqNames(v.name, f.name))
) {
throwCompilationError(
`Field ${idTextErr(f.name)} already exists`,
f.loc,
);
}
if (
types
.get(idText(a.name))!
.constants.find((v) => eqNames(v.name, f.name))
) {
throwCompilationError(
`Constant ${idTextErr(f.name)} already exists`,
f.loc,
);
}
if (f.attributes.find((v) => v.type !== "override")) {
throwCompilationError(
`Constant can be only overridden`,
f.loc,
);
}
types
.get(idText(a.name))!
.constants.push(buildConstantDescription(f));
}
}
}
// Struct
if (a.kind === "struct_decl" || a.kind === "message_decl") {
for (const f of a.fields) {
if (
types
.get(idText(a.name))!
.fields.find((v) => eqNames(v.name, f.name))
) {
throwCompilationError(
`Field ${idTextErr(f.name)} already exists`,
f.loc,
);
}
types
.get(idText(a.name))!
.fields.push(
buildFieldDescription(
f,
types.get(idText(a.name))!.fields.length,
),
);
}
if (a.fields.length === 0 && a.kind === "struct_decl") {
throwCompilationError(
`Struct ${idTextErr(a.name)} must have at least one field`,
a.loc,
);
}
if (a.kind === "message_decl" && a.opcode) {
if (a.opcode.value === 0n) {
throwCompilationError(
`Zero opcodes are reserved for text comments and cannot be used for message structs`,
a.opcode.loc,
);
}
if (a.opcode.value > 0xffff_ffff) {
throwCompilationError(
`Opcode of message ${idTextErr(a.name)} is too large: it must fit into 32 bits`,
a.opcode.loc,
);
}
}
}
// Trait
if (a.kind === "trait") {
for (const traitDecl of a.declarations) {
if (traitDecl.kind === "field_decl") {
if (
types
.get(idText(a.name))!
.fields.find((v) => eqNames(v.name, traitDecl.name))
) {
throwCompilationError(
`Field ${idTextErr(traitDecl.name)} already exists`,
traitDecl.loc,
);
}
if (traitDecl.as) {
throwCompilationError(
`Trait field cannot have serialization specifier`,
traitDecl.loc,
);
}
if (traitDecl.initializer) {
throwCompilationError(
`Trait field cannot have an initializer`,
traitDecl.initializer.loc,
);
}
types
.get(idText(a.name))!
.fields.push(
buildFieldDescription(
traitDecl,
types.get(idText(a.name))!.fields.length,
),
);
} else if (
traitDecl.kind === "constant_def" ||
traitDecl.kind === "constant_decl"
) {
if (
types
.get(idText(a.name))!
.fields.find((v) => eqNames(v.name, traitDecl.name))
) {
throwCompilationError(
`Field ${idTextErr(traitDecl.name)} already exists`,
traitDecl.loc,
);
}
if (
types
.get(idText(a.name))!
.constants.find((v) =>
eqNames(v.name, traitDecl.name),
)
) {
throwCompilationError(
`Constant ${idTextErr(traitDecl.name)} already exists`,
traitDecl.loc,
);
}
if (
traitDecl.attributes.find((v) => v.type === "override")
) {
throwCompilationError(
`Trait constant cannot be overridden`,
traitDecl.loc,
);
}
types
.get(idText(a.name))!
.constants.push(buildConstantDescription(traitDecl));
}
}
}
}
//
// Populate partial serialization info
//
for (const t of types.values()) {
t.partialFieldCount = resolvePartialFields(ctx, t);
}
//
// Resolve contract functions
//
function resolveFunctionDescriptor(
optSelf: TypeRef | null,
a:
| AstFunctionDef
| AstNativeFunctionDecl
| AstFunctionDecl
| AstAsmFunctionDef,
origin: ItemOrigin,
): FunctionDescription {
let self = optSelf;
// Resolve return
let returns: TypeRef = { kind: "void" };
if (a.return) {
returns = buildTypeRef(a.return, types);
}
let params: FunctionParameter[] = [];
for (const r of a.params) {
params.push({
name: r.name,
type: buildTypeRef(r.type, types),
loc: r.loc,
});
}
// Resolve flags
const isGetter = a.attributes.find((a) => a.type === "get");
const isMutating = a.attributes.find((a) => a.type === "mutates");
const isExtends = a.attributes.find((a) => a.type === "extends");
const isVirtual = a.attributes.find((a) => a.type === "virtual");
const isOverride = a.attributes.find((a) => a.type === "override");
const isInline = a.attributes.find((a) => a.type === "inline");
const isAbstract = a.attributes.find((a) => a.type === "abstract");
// Check for native
if (a.kind === "native_function_decl") {
if (isGetter) {
throwCompilationError(
"Native functions cannot be getters",
isGetter.loc,
);
}
if (self) {
throwCompilationError(
"Native functions cannot be declared within a contract",
a.loc,
);
}
if (isVirtual) {
throwCompilationError(
"Native functions cannot be virtual",
isVirtual.loc,
);
}
if (isOverride) {
throwCompilationError(
"Native functions cannot be overridden",
isOverride.loc,
);
}
}
// Check virtual and override
if (isVirtual && isExtends) {
throwCompilationError(
"Extend functions cannot be virtual",
isVirtual.loc,
);
}
if (isOverride && isExtends) {
throwCompilationError(
"Extend functions cannot be overridden",
isOverride.loc,
);
}
if (isAbstract && isExtends) {
throwCompilationError(
"Extend functions cannot be abstract",
isAbstract.loc,
);
}
if (!self && isVirtual) {
throwCompilationError(
"Virtual functions must be defined within a contract or a trait",
isVirtual.loc,
);
}
if (!self && isOverride) {
throwCompilationError(
"Overrides functions must be defined within a contract or a trait",
isOverride.loc,
);
}
if (!self && isAbstract) {
throwCompilationError(
"Abstract functions must be defined within a trait",
isAbstract.loc,
);
}
if (isVirtual && isAbstract) {
throwCompilationError(
"Abstract functions cannot be virtual",
isAbstract.loc,
);
}
if (isVirtual && isOverride) {
throwCompilationError(
"Overrides functions cannot be virtual",
isOverride.loc,
);
}
if (isAbstract && isOverride) {
throwCompilationError(
"Overrides functions cannot be abstract",
isOverride.loc,
);
}
// Check virtual
if (isVirtual) {
if (self?.kind !== "ref") {
throwInternalCompilerError(
"Virtual functions must have a self parameter",
isVirtual.loc,
);
}
const t = types.get(self.name!)!;
if (t.kind !== "trait") {
throwCompilationError(
"Virtual functions must be defined within a trait",
isVirtual.loc,
);
}
}
// Check abstract
if (isAbstract) {
if (self?.kind !== "ref") {
throwInternalCompilerError(
"Abstract functions must have a self parameter",
isAbstract.loc,
);
}
const t = types.get(self.name!)!;
if (t.kind !== "trait") {
throwCompilationError(
"Abstract functions must be defined within a trait",
isAbstract.loc,
);
}
}
if (isOverride) {
if (self?.kind !== "ref") {
throwInternalCompilerError(
"Override functions must have a self parameter",
isOverride.loc,
);
}
const t = types.get(self.name!)!;
if (!["contract", "trait"].includes(t.kind)) {
throwCompilationError(
"Overridden functions must be defined within a contract or a trait",
isOverride.loc,
);
}
}
// Check for common
if (a.kind === "function_def") {
if (isGetter && !self) {
throwCompilationError(
"Getters must be defined within a contract",
isGetter.loc,
);
}
}
// Check for getter
if (isInline && isGetter) {
throwCompilationError("Getters cannot be inline", isInline.loc);
}
// Validate mutating
if (isExtends) {
if (self) {
throwCompilationError(
"Extend functions cannot be defined within a contract",
isExtends.loc,
);
}
if (params.length === 0) {
throwCompilationError(
"Extend functions must have at least one parameter",
isExtends.loc,
);
}
const firstParam = params[0]!;
if (!isSelfId(firstParam.name)) {
throwCompilationError(
'Extend function must have first parameter named "self"',
firstParam.loc,
);
}
if (firstParam.type.kind !== "ref") {
throwCompilationError(
"Extend functions must have a reference type as the first parameter",
firstParam.loc,
);
}
if (!types.has(firstParam.type.name)) {
throwCompilationError(
"Type " + firstParam.type.name + " not found",
firstParam.loc,
);
}
// Update self and remove first parameter
self = firstParam.type;
params = params.slice(1);
}
// Check for mutating and extends
if (isMutating && !isExtends) {
throwCompilationError(
"Mutating functions must be extend functions",
isMutating.loc,
);
}
// Check parameter names
const exNames: Set<string> = new Set();
for (const param of params) {
if (isSelfId(param.name)) {
throwCompilationError(
'Parameter name "self" is reserved',
param.loc,
);
}
if (exNames.has(idText(param.name))) {
throwCompilationError(
`Parameter name ${idTextErr(param.name)} is already used`,
param.loc,
);
}
exNames.add(idText(param.name));
}
// Check for runtime types in getters
if (isGetter) {
for (const param of params) {
if (isRuntimeType(param.type)) {
throwCompilationError(
printTypeRef(param.type) +
" is a runtime-only type and can't be used as a getter parameter",
param.loc,
);
}
}
if (isRuntimeType(returns)) {
throwCompilationError(
printTypeRef(returns) +
" is a runtime-only type and can't be used as getter return type",
a.loc,
);
}
}
// check asm shuffle
if (a.kind === "asm_function_def") {
// check arguments shuffle
if (a.shuffle.args.length !== 0) {
const shuffleArgSet = new Set(
a.shuffle.args.map((id) => idText(id)),
);
if (shuffleArgSet.size !== a.shuffle.args.length) {
throwCompilationError(
"asm argument rearrangement cannot have duplicates",
a.loc,
);
}
const paramSet = new Set(
a.params.map((typedId) => idText(typedId.name)),
);
if (!paramSet.isSubsetOf(shuffleArgSet)) {
throwCompilationError(
"asm argument rearrangement must mention all function parameters",
a.loc,
);
}
if (!shuffleArgSet.isSubsetOf(paramSet)) {
throwCompilationError(
"asm argument rearrangement must mention only function parameters",
a.loc,
);
}
}
// check return shuffle
if (a.shuffle.ret.length !== 0) {
const shuffleRetSet = new Set(
a.shuffle.ret.map((num) => Number(num.value)),
);
if (shuffleRetSet.size !== a.shuffle.ret.length) {
throwCompilationError(
"asm return rearrangement cannot have duplicates",
a.loc,
);
}
let retTupleSize = 0;
switch (returns.kind) {
case "ref":
{
const ty = types.get(returns.name)!;
switch (ty.kind) {
case "struct":
case "contract":
retTupleSize = ty.fields.length;
break;
case "primitive_type_decl":
retTupleSize = 1;
break;
case "trait":
throwInternalCompilerError(
"A trait cannot be returned from a function",
a.loc,
);
}
}
break;
case "null":
case "map":
retTupleSize = 1;
break;
case "ref_bounced":
throwInternalCompilerError(
"A <bounced> type cannot be returned from a function",
a.loc,
);
break;
case "void":
retTupleSize = 0;
break;
}
// mutating functions also return `self` arg (implicitly in Tact, but explicitly in FunC)
retTupleSize += isMutating ? 1 : 0;
const returnValueSet = new Set([...Array(retTupleSize).keys()]);
if (!returnValueSet.isSubsetOf(shuffleRetSet)) {
throwCompilationError(
`asm return rearrangement must mention all return position numbers: [0..${retTupleSize - 1}]`,
a.loc,
);
}
if (!shuffleRetSet.isSubsetOf(returnValueSet)) {
throwCompilationError(
`asm return rearrangement must mention only valid return position numbers: [0..${retTupleSize - 1}]`,
a.loc,
);
}
}
}
// Register function
return {
name: idText(a.name),
self: self,
origin,
params,
returns,
ast: a,
isMutating: !!isMutating || !!optSelf /* && !isGetter */, // Mark all contract functions as mutating