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compiler.ts
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/**
* The AssemblyScript compiler.
* @module compiler
*//***/
import {
compileCall as compileBuiltinCall,
compileAbort,
compileIterateRoots,
ensureGCHook
} from "./builtins";
import {
DiagnosticCode,
DiagnosticEmitter
} from "./diagnostics";
import {
Module,
MemorySegment,
ExpressionRef,
UnaryOp,
BinaryOp,
NativeType,
FunctionRef,
ExpressionId,
FunctionTypeRef,
GlobalRef,
getExpressionId,
getExpressionType,
getConstValueI32,
getConstValueI64Low,
getConstValueI64High,
getConstValueF32,
getConstValueF64,
getGetLocalIndex,
getBlockChildCount,
getBlockChild,
getBlockName,
needsExplicitUnreachable
} from "./module";
import {
CommonFlags,
PATH_DELIMITER,
INNER_DELIMITER,
INSTANCE_DELIMITER,
STATIC_DELIMITER,
GETTER_PREFIX,
SETTER_PREFIX
} from "./common";
import {
Program,
ClassPrototype,
Class,
Element,
ElementKind,
Enum,
Field,
FunctionPrototype,
Function,
FunctionTarget,
Global,
Local,
Namespace,
EnumValue,
Property,
VariableLikeElement,
FlowFlags,
ConstantValueKind,
Flow,
OperatorKind,
DecoratorFlags
} from "./program";
import {
Resolver, ReportMode
} from "./resolver";
import {
Token,
operatorTokenToString
} from "./tokenizer";
import {
Node,
NodeKind,
TypeNode,
Source,
Range,
DecoratorKind,
AssertionKind,
Statement,
BlockStatement,
BreakStatement,
ClassDeclaration,
ContinueStatement,
DeclarationStatement,
DoStatement,
EmptyStatement,
EnumDeclaration,
ExportStatement,
ExpressionStatement,
FunctionDeclaration,
ForStatement,
IfStatement,
ImportStatement,
InstanceOfExpression,
InterfaceDeclaration,
NamespaceDeclaration,
ReturnStatement,
SwitchStatement,
ThrowStatement,
TryStatement,
VariableDeclaration,
VariableStatement,
VoidStatement,
WhileStatement,
Expression,
AssertionExpression,
BinaryExpression,
CallExpression,
CommaExpression,
ElementAccessExpression,
FloatLiteralExpression,
FunctionExpression,
IdentifierExpression,
IntegerLiteralExpression,
LiteralExpression,
LiteralKind,
NewExpression,
ObjectLiteralExpression,
ParenthesizedExpression,
PropertyAccessExpression,
TernaryExpression,
ArrayLiteralExpression,
StringLiteralExpression,
UnaryPostfixExpression,
UnaryPrefixExpression,
nodeIsConstantValue,
isLastStatement,
findDecorator
} from "./ast";
import {
Type,
TypeKind,
TypeFlags,
Signature,
typesToNativeTypes
} from "./types";
import {
writeI8,
writeI16,
writeI32,
writeI64,
writeF32,
writeF64,
makeMap
} from "./util";
/** Compilation target. */
export enum Target {
/** WebAssembly with 32-bit pointers. */
WASM32,
/** WebAssembly with 64-bit pointers. Experimental and not supported by any runtime yet. */
WASM64
}
/** Compiler options. */
export class Options {
/** WebAssembly target. Defaults to {@link Target.WASM32}. */
target: Target = Target.WASM32;
/** If true, compiles everything instead of just reachable code. */
noTreeShaking: bool = false;
/** If true, replaces assertions with nops. */
noAssert: bool = false;
/** If true, imports the memory provided by the embedder. */
importMemory: bool = false;
/** If true, imports the function table provided by the embedder. */
importTable: bool = false;
/** If true, generates information necessary for source maps. */
sourceMap: bool = false;
/** Static memory start offset. */
memoryBase: i32 = 0;
/** Global aliases. */
globalAliases: Map<string,string> | null = null;
/** Additional features to activate. */
features: Feature = Feature.NONE;
/** Hinted optimize level. Not applied by the compiler itself. */
optimizeLevelHint: i32 = 0;
/** Hinted shrink level. Not applied by the compiler itself. */
shrinkLevelHint: i32 = 0;
/** Tests if the target is WASM64 or, otherwise, WASM32. */
get isWasm64(): bool {
return this.target == Target.WASM64;
}
/** Gets the unsigned size type matching the target. */
get usizeType(): Type {
return this.target == Target.WASM64 ? Type.usize64 : Type.usize32;
}
/** Gets the signed size type matching the target. */
get isizeType(): Type {
return this.target == Target.WASM64 ? Type.isize64 : Type.isize32;
}
/** Gets the native size type matching the target. */
get nativeSizeType(): NativeType {
return this.target == Target.WASM64 ? NativeType.I64 : NativeType.I32;
}
/** Tests if a specific feature is activated. */
hasFeature(feature: Feature): bool {
return (this.features & feature) != 0;
}
}
/** Indicates specific features to activate. */
export const enum Feature {
/** No additional features. */
NONE = 0,
/** Sign extension operations. */
SIGN_EXTENSION = 1 << 0, // see: https://github.com/WebAssembly/sign-extension-ops
/** Mutable global imports and exports. */
MUTABLE_GLOBAL = 1 << 1, // see: https://github.com/WebAssembly/mutable-global
/** Bulk memory operations. */
BULK_MEMORY = 1 << 2, // see: https://github.com/WebAssembly/bulk-memory-operations
/** SIMD types and operations. */
SIMD = 1 << 3 // see: https://github.com/WebAssembly/simd
}
/** Indicates the desired kind of a conversion. */
export const enum ConversionKind {
/** No conversion. */
NONE,
/** Implicit conversion. */
IMPLICIT,
/** Explicit conversion. */
EXPLICIT
}
/** Indicates the desired wrap mode of a conversion. */
export const enum WrapMode {
/** No wrapping. */
NONE,
/** Wrap small integer values. */
WRAP
}
/** Compiler interface. */
export class Compiler extends DiagnosticEmitter {
/** Program reference. */
program: Program;
/** Resolver reference. */
resolver: Resolver;
/** Provided options. */
options: Options;
/** Module instance being compiled. */
module: Module;
/** Current control flow. */
currentFlow: Flow;
/** Current inline functions stack. */
currentInlineFunctions: Function[] = [];
/** Current enum in compilation. */
currentEnum: Enum | null = null;
/** Current type in compilation. */
currentType: Type = Type.void;
/** Start function being compiled. */
startFunctionInstance: Function;
/** Start function statements. */
startFunctionBody: ExpressionRef[];
/** Counting memory offset. */
memoryOffset: I64;
/** Memory segments being compiled. */
memorySegments: MemorySegment[] = [];
/** Map of already compiled static string segments. */
stringSegments: Map<string,MemorySegment> = new Map();
/** Function table being compiled. */
functionTable: string[] = [ "null" ];
/** Argument count helper global. */
argcVar: GlobalRef = 0;
/** Argument count helper setter. */
argcSet: FunctionRef = 0;
/** Indicates whether the iterateRoots function must be generated. */
needsIterateRoots: bool = false;
/** Compiles a {@link Program} to a {@link Module} using the specified options. */
static compile(program: Program, options: Options | null = null): Module {
return new Compiler(program, options).compile();
}
/** Constructs a new compiler for a {@link Program} using the specified options. */
constructor(program: Program, options: Options | null = null) {
super(program.diagnostics);
this.program = program;
this.resolver = program.resolver;
if (!options) options = new Options();
this.options = options;
this.memoryOffset = i64_new(
// leave space for `null`. also functions as a sentinel for erroneous stores at offset 0.
// note that Binaryen's asm.js output utilizes the first 8 bytes for reinterpretations (#1547)
max(options.memoryBase, 8)
);
this.module = Module.create();
}
/** Performs compilation of the underlying {@link Program} to a {@link Module}. */
compile(): Module {
var options = this.options;
var module = this.module;
var program = this.program;
// initialize lookup maps, built-ins, imports, exports, etc.
program.initialize(options);
// set up the start function
var startFunctionInstance = new Function(program.startFunction, "start", new Signature([], Type.void));
this.startFunctionInstance = startFunctionInstance;
var startFunctionBody = new Array<ExpressionRef>();
this.startFunctionBody = startFunctionBody;
this.currentFlow = startFunctionInstance.flow;
// add a mutable heap base dummy
if (options.isWasm64) {
module.addGlobal(
"HEAP_BASE",
NativeType.I64,
true,
module.createI64(0, 0)
);
} else {
module.addGlobal(
"HEAP_BASE",
NativeType.I32,
false,
module.createI32(0)
);
}
// compile entry file(s) while traversing reachable elements
var sources = program.sources;
for (let i = 0, k = sources.length; i < k; ++i) {
if (sources[i].isEntry) this.compileSource(sources[i]);
}
// compile the start function if not empty or called by main
if (startFunctionBody.length || program.mainFunction !== null) {
let signature = startFunctionInstance.signature;
let funcRef = module.addFunction(
startFunctionInstance.internalName,
this.ensureFunctionType(
signature.parameterTypes,
signature.returnType,
signature.thisType
),
typesToNativeTypes(startFunctionInstance.additionalLocals),
module.createBlock(null, startFunctionBody)
);
startFunctionInstance.finalize(module, funcRef);
if (!program.mainFunction) module.setStart(funcRef);
}
// update the heap base pointer
var memoryOffset = this.memoryOffset;
memoryOffset = i64_align(memoryOffset, options.usizeType.byteSize);
this.memoryOffset = memoryOffset;
module.removeGlobal("HEAP_BASE");
if (options.isWasm64) {
module.addGlobal(
"HEAP_BASE",
NativeType.I64,
false,
module.createI64(i64_low(memoryOffset), i64_high(memoryOffset))
);
} else {
module.addGlobal(
"HEAP_BASE",
NativeType.I32,
false,
module.createI32(i64_low(memoryOffset))
);
}
// set up memory
module.setMemory(
this.options.memoryBase /* is specified */ || this.memorySegments.length
? i64_low(i64_shr_u(i64_align(memoryOffset, 0x10000), i64_new(16, 0)))
: 0,
Module.UNLIMITED_MEMORY,
this.memorySegments,
options.target,
"memory"
);
// import memory if requested (default memory is named '0' by Binaryen)
if (options.importMemory) module.addMemoryImport("0", "env", "memory");
// set up function table
var functionTable = this.functionTable;
module.setFunctionTable(functionTable.length, 0xffffffff, functionTable);
module.addTableExport("0", "table");
module.addFunction("null", this.ensureFunctionType(null, Type.void), null, module.createBlock(null, []));
// import table if requested (default table is named '0' by Binaryen)
if (options.importTable) module.addTableImport("0", "env", "table");
// set up module exports
for (let [name, moduleExport] of program.moduleLevelExports) {
this.makeModuleExport(name, moduleExport.element);
}
// set up gc
if (this.needsIterateRoots) compileIterateRoots(this);
return module;
}
/** Applies the respective module export(s) for the specified element. */
private makeModuleExport(name: string, element: Element, prefix: string = ""): void {
// traverse members
var members = element.members;
if (members) {
let subPrefix = prefix + name + (element.kind == ElementKind.CLASS
? INSTANCE_DELIMITER
: STATIC_DELIMITER
);
if (element.kind == ElementKind.NAMESPACE) {
for (let member of members.values()) {
if (!member.is(CommonFlags.EXPORT)) continue;
this.makeModuleExport(member.simpleName, member, subPrefix);
}
} else {
for (let member of members.values()) {
if (member.is(CommonFlags.PRIVATE)) continue;
this.makeModuleExport(member.simpleName, member, subPrefix);
}
}
}
switch (element.kind) {
// export global
case ElementKind.GLOBAL: {
let isConst = element.is(CommonFlags.CONST) || element.is(CommonFlags.STATIC | CommonFlags.READONLY);
if (!isConst && !this.options.hasFeature(Feature.MUTABLE_GLOBAL)) {
let declaration = (<Global>element).declaration;
if (declaration) {
this.error(
DiagnosticCode.Cannot_export_a_mutable_global,
declaration.name.range
);
}
} else {
this.module.addGlobalExport(element.internalName, prefix + name);
}
break;
}
case ElementKind.ENUMVALUE: {
if (!assert(element.parent).is(CommonFlags.CONST) && !this.options.hasFeature(Feature.MUTABLE_GLOBAL)) {
let declaration = (<EnumValue>element).declaration;
if (declaration) {
this.error(
DiagnosticCode.Cannot_export_a_mutable_global,
declaration.name.range
);
}
} else {
this.module.addGlobalExport(element.internalName, prefix + name);
}
break;
}
// export function
case ElementKind.FUNCTION: {
let instance = <Function>element;
let signature = instance.signature;
if (signature.requiredParameters < signature.parameterTypes.length) {
// utilize trampoline to fill in omitted arguments
instance = this.ensureTrampoline(instance);
this.ensureArgcSet();
}
if (instance.is(CommonFlags.COMPILED)) this.module.addFunctionExport(instance.internalName, prefix + name);
break;
}
// export getter and setter
case ElementKind.PROPERTY: {
let getter = assert((<Property>element).getterPrototype);
this.makeModuleExport(GETTER_PREFIX + name, getter, prefix);
let setter = (<Property>element).setterPrototype;
if (setter) this.makeModuleExport(SETTER_PREFIX + name, setter, prefix);
break;
}
// export a getter and a setter
case ElementKind.FIELD: {
let module = this.module;
let type = (<Field>element).type;
let nativeType = type.toNativeType();
let offset = (<Field>element).memoryOffset;
let usizeType = this.options.usizeType;
let nativeSizeType = this.options.nativeSizeType;
// make a getter
let getterName = prefix + GETTER_PREFIX + name;
module.addFunction(
getterName,
this.ensureFunctionType(null, type, usizeType),
null,
module.createLoad(
type.byteSize,
type.is(TypeFlags.SIGNED),
module.createGetLocal(0, nativeSizeType),
nativeType,
offset
)
);
module.addFunctionExport(getterName, getterName);
// make a setter
if (!element.is(CommonFlags.READONLY)) {
let setterName = prefix + SETTER_PREFIX + name;
module.addFunction(
setterName,
this.ensureFunctionType([ type ], Type.void, usizeType),
null,
module.createStore(
type.byteSize,
module.createGetLocal(0, nativeSizeType),
module.createGetLocal(1, nativeType),
nativeType,
offset
)
);
module.addFunctionExport(setterName, setterName);
}
break;
}
// skip prototype and export instances
case ElementKind.FUNCTION_PROTOTYPE: {
for (let instances of (<FunctionPrototype>element).instances.values()) {
for (let instance of instances.values()) {
let instanceName = name;
if (instance.is(CommonFlags.GENERIC)) {
let fullName = instance.internalName;
instanceName += fullName.substring(fullName.lastIndexOf("<"));
}
this.makeModuleExport(instanceName, instance, prefix);
}
}
break;
}
case ElementKind.CLASS_PROTOTYPE: {
for (let instance of (<ClassPrototype>element).instances.values()) {
let instanceName = name;
if (instance.is(CommonFlags.GENERIC)) {
let fullName = instance.internalName;
instanceName += fullName.substring(fullName.lastIndexOf("<"));
}
let ctor = instance.constructorInstance;
if (ctor) this.makeModuleExport(instanceName + INSTANCE_DELIMITER + ctor.simpleName, ctor, prefix);
this.makeModuleExport(instanceName, instance, prefix);
}
break;
}
// all possible members already handled above
case ElementKind.ENUM:
case ElementKind.CLASS:
case ElementKind.NAMESPACE: break;
default: assert(false);
}
}
// sources
/** Compiles a source by looking it up by path first. */
compileSourceByPath(normalizedPathWithoutExtension: string, reportNode: Node): void {
var source = this.program.lookupSourceByPath(normalizedPathWithoutExtension);
if (source) this.compileSource(source);
else {
this.error(
DiagnosticCode.File_0_not_found,
reportNode.range, normalizedPathWithoutExtension
);
}
}
/** Compiles a source. */
compileSource(source: Source): void {
if (source.is(CommonFlags.COMPILED)) return;
source.set(CommonFlags.COMPILED);
// compile top-level statements
var noTreeShaking = this.options.noTreeShaking;
var isEntry = source.isEntry;
var startFunctionInstance = this.startFunctionInstance;
var startFunctionBody = this.startFunctionBody;
var statements = source.statements;
for (let i = 0, k = statements.length; i < k; ++i) {
let statement = statements[i];
switch (statement.kind) {
case NodeKind.CLASSDECLARATION: {
if (
(noTreeShaking || (isEntry && statement.is(CommonFlags.EXPORT))) &&
!(<ClassDeclaration>statement).isGeneric
) {
this.compileClassDeclaration(<ClassDeclaration>statement, []);
}
break;
}
case NodeKind.INTERFACEDECLARATION: break;
case NodeKind.ENUMDECLARATION: {
if (noTreeShaking || (isEntry && statement.is(CommonFlags.EXPORT))) {
this.compileEnumDeclaration(<EnumDeclaration>statement);
}
break;
}
case NodeKind.FUNCTIONDECLARATION: {
if (
(noTreeShaking || (isEntry && statement.is(CommonFlags.EXPORT))) &&
!(<FunctionDeclaration>statement).isGeneric
) {
this.compileFunctionDeclaration(<FunctionDeclaration>statement, []);
}
break;
}
case NodeKind.IMPORT: {
this.compileSourceByPath(
(<ImportStatement>statement).normalizedPath,
(<ImportStatement>statement).path
);
break;
}
case NodeKind.NAMESPACEDECLARATION: {
if (noTreeShaking || (isEntry && statement.is(CommonFlags.EXPORT))) {
this.compileNamespaceDeclaration(<NamespaceDeclaration>statement);
}
break;
}
case NodeKind.VARIABLE: { // global, always compiled as initializers might have side effects
let variableInit = this.compileVariableStatement(<VariableStatement>statement);
if (variableInit) startFunctionBody.push(variableInit);
break;
}
case NodeKind.EXPORT: {
if ((<ExportStatement>statement).normalizedPath != null) {
this.compileSourceByPath(
<string>(<ExportStatement>statement).normalizedPath,
<StringLiteralExpression>(<ExportStatement>statement).path
);
}
if (noTreeShaking || isEntry) {
this.compileExportStatement(<ExportStatement>statement);
}
break;
}
default: { // otherwise a top-level statement that is part of the start function's body
let previousFlow = this.currentFlow;
this.currentFlow = startFunctionInstance.flow;
startFunctionBody.push(
this.compileStatement(statement)
);
this.currentFlow = previousFlow;
break;
}
}
}
}
// globals
compileGlobalDeclaration(declaration: VariableDeclaration): Global | null {
// look up the initialized program element
var element = assert(this.program.elementsLookup.get(declaration.fileLevelInternalName));
assert(element.kind == ElementKind.GLOBAL);
if (!this.compileGlobal(<Global>element)) return null; // reports
return <Global>element;
}
compileGlobal(global: Global): bool {
if (global.is(CommonFlags.COMPILED)) return true;
global.set(CommonFlags.COMPILED);
var module = this.module;
var declaration = global.declaration;
var initExpr: ExpressionRef = 0;
if (!global.is(CommonFlags.RESOLVED)) {
if (declaration) {
// resolve now if annotated
if (declaration.type) {
let resolvedType = this.resolver.resolveType(declaration.type); // reports
if (!resolvedType) return false;
if (resolvedType == Type.void) {
this.error(
DiagnosticCode.Type_expected,
declaration.type.range
);
return false;
}
global.type = resolvedType;
global.set(CommonFlags.RESOLVED);
// infer from initializer if not annotated
} else if (declaration.initializer) { // infer type using void/NONE for literal inference
initExpr = this.compileExpressionRetainType( // reports
declaration.initializer,
Type.void,
WrapMode.WRAP
);
if (this.currentType == Type.void) {
this.error(
DiagnosticCode.Type_0_is_not_assignable_to_type_1,
declaration.initializer.range, this.currentType.toString(), "<auto>"
);
return false;
}
global.type = this.currentType;
global.set(CommonFlags.RESOLVED);
// must either be annotated or have an initializer
} else {
this.error(
DiagnosticCode.Type_expected,
declaration.name.range.atEnd
);
return false;
}
} else {
assert(false); // must have a declaration if resolved lazily
}
}
// ambient builtins like 'HEAP_BASE' need to be resolved but are added explicitly
if (global.is(CommonFlags.AMBIENT) && global.hasDecorator(DecoratorFlags.BUILTIN)) return true;
var nativeType = global.type.toNativeType();
var isDeclaredConstant = global.is(CommonFlags.CONST) || global.is(CommonFlags.STATIC | CommonFlags.READONLY);
// handle imports
if (global.is(CommonFlags.AMBIENT)) {
// constant global
if (isDeclaredConstant || this.options.hasFeature(Feature.MUTABLE_GLOBAL)) {
global.set(CommonFlags.MODULE_IMPORT);
if (declaration) {
mangleImportName(global, declaration);
} else {
mangleImportName_moduleName = "env";
mangleImportName_elementName = global.simpleName;
}
module.addGlobalImport(
global.internalName,
mangleImportName_moduleName,
mangleImportName_elementName,
nativeType
);
global.set(CommonFlags.COMPILED);
return true;
// importing mutable globals is not supported in the MVP
} else {
this.error(
DiagnosticCode.Operation_not_supported,
assert(declaration).range
);
}
return false;
}
// the MVP does not yet support initializer expressions other than constant values (and constant
// get_globals), hence such initializations must be performed in the start function for now.
var initializeInStart = false;
// evaluate initializer if present
if (declaration !== null && declaration.initializer !== null) {
if (!initExpr) {
initExpr = this.compileExpression(
declaration.initializer,
global.type,
ConversionKind.IMPLICIT,
WrapMode.WRAP
);
}
if (getExpressionId(initExpr) != ExpressionId.Const) {
if (isDeclaredConstant) {
initExpr = module.precomputeExpression(initExpr);
if (getExpressionId(initExpr) != ExpressionId.Const) {
this.warning(
DiagnosticCode.Compiling_constant_with_non_constant_initializer_as_mutable,
declaration.range
);
initializeInStart = true;
}
} else {
initializeInStart = true;
}
}
// explicitly inline if annotated
if (global.hasDecorator(DecoratorFlags.INLINE)) {
if (!initializeInStart) { // reported above
assert(getExpressionId(initExpr) == ExpressionId.Const);
let exprType = getExpressionType(initExpr);
switch (exprType) {
case NativeType.I32: {
global.constantValueKind = ConstantValueKind.INTEGER;
global.constantIntegerValue = i64_new(getConstValueI32(initExpr), 0);
break;
}
case NativeType.I64: {
global.constantValueKind = ConstantValueKind.INTEGER;
global.constantIntegerValue = i64_new(
getConstValueI64Low(initExpr),
getConstValueI64High(initExpr)
);
break;
}
case NativeType.F32: {
global.constantValueKind = ConstantValueKind.FLOAT;
global.constantFloatValue = getConstValueF32(initExpr);
break;
}
case NativeType.F64: {
global.constantValueKind = ConstantValueKind.FLOAT;
global.constantFloatValue = getConstValueF64(initExpr);
break;
}
default: {
assert(false);
return false;
}
}
global.set(CommonFlags.INLINED); // inline the value from now on
}
}
// initialize to zero if there's no initializer
} else {
initExpr = global.type.toNativeZero(module);
}
var internalName = global.internalName;
if (initializeInStart) { // initialize to mutable zero and set the actual value in start
module.addGlobal(internalName, nativeType, true, global.type.toNativeZero(module));
this.startFunctionBody.push(module.createSetGlobal(internalName, initExpr));
} else { // compile normally
module.addGlobal(internalName, nativeType, !isDeclaredConstant, initExpr);
}
return true;
}
// enums
compileEnumDeclaration(declaration: EnumDeclaration): Enum | null {
var element = assert(this.program.elementsLookup.get(declaration.fileLevelInternalName));
assert(element.kind == ElementKind.ENUM);
if (!this.compileEnum(<Enum>element)) return null;
return <Enum>element;
}
compileEnum(element: Enum): bool {
if (element.is(CommonFlags.COMPILED)) return true;
element.set(CommonFlags.COMPILED);
var module = this.module;
this.currentEnum = element;
var previousValue: EnumValue | null = null;
var previousValueIsMut = false;
if (element.members) {
for (let member of element.members.values()) {
if (member.kind != ElementKind.ENUMVALUE) continue; // happens if an enum is also a namespace
let initInStart = false;
let val = <EnumValue>member;
let valueDeclaration = val.declaration;
val.set(CommonFlags.COMPILED);
let initExpr: ExpressionRef;
if (valueDeclaration.value) {
initExpr = this.compileExpression(
<Expression>valueDeclaration.value,
Type.i32,
ConversionKind.IMPLICIT,
WrapMode.NONE
);
if (getExpressionId(initExpr) != ExpressionId.Const) {
if (element.is(CommonFlags.CONST)) {
initExpr = module.precomputeExpression(initExpr);
if (getExpressionId(initExpr) != ExpressionId.Const) {
this.error(
DiagnosticCode.In_const_enum_declarations_member_initializer_must_be_constant_expression,
valueDeclaration.value.range
);
initInStart = true;
}
} else {
initInStart = true;
}
}
} else if (previousValue == null) {
initExpr = module.createI32(0);
} else {
if (previousValueIsMut) {
this.error(
DiagnosticCode.Enum_member_must_have_initializer,
valueDeclaration.range
);
}
initExpr = module.createBinary(BinaryOp.AddI32,
module.createGetGlobal(previousValue.internalName, NativeType.I32),
module.createI32(1)
);
initExpr = module.precomputeExpression(initExpr);
if (getExpressionId(initExpr) != ExpressionId.Const) {
if (element.is(CommonFlags.CONST)) {
this.error(
DiagnosticCode.In_const_enum_declarations_member_initializer_must_be_constant_expression,
valueDeclaration.range
);
}
initInStart = true;
}
}
if (initInStart) {
module.addGlobal(val.internalName, NativeType.I32, true, module.createI32(0));
this.startFunctionBody.push(module.createSetGlobal(val.internalName, initExpr));
previousValueIsMut = true;
} else {
module.addGlobal(val.internalName, NativeType.I32, !element.is(CommonFlags.CONST), initExpr);
previousValueIsMut = false;
}
previousValue = <EnumValue>val;
}
}
this.currentEnum = null;
return true;
}
// functions
/** Compiles a top-level function given its declaration. */
compileFunctionDeclaration(
declaration: FunctionDeclaration,
typeArguments: TypeNode[]
): Function | null {
var element = assert(this.program.elementsLookup.get(declaration.fileLevelInternalName));
assert(element.kind == ElementKind.FUNCTION_PROTOTYPE);
return this.compileFunctionUsingTypeArguments( // reports
<FunctionPrototype>element,
typeArguments,
makeMap<string,Type>(),
null,
(<FunctionPrototype>element).declaration.name
);
}
/** Resolves the specified type arguments prior to compiling the resulting function instance. */
compileFunctionUsingTypeArguments(
prototype: FunctionPrototype,
typeArguments: TypeNode[],
contextualTypeArguments: Map<string,Type>,
outerScope: Flow | null,
reportNode: Node
): Function | null {
var instance = this.resolver.resolveFunctionInclTypeArguments(
prototype,
typeArguments,
contextualTypeArguments,
reportNode
);
if (!instance) return null;
instance.outerScope = outerScope;
if (!this.compileFunction(instance)) return null; // reports
return instance;
}
/** Either reuses or creates the function type matching the specified signature. */
ensureFunctionType(
parameterTypes: Type[] | null,
returnType: Type,