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Report if a function isn't guaranteed to return

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This commit is contained in:
dcodeIO
2018-01-19 04:16:18 +01:00
parent 7be4f9fabb
commit ef7a095494
9 changed files with 131 additions and 30 deletions
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32
src/program.ts
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@ -2123,9 +2123,12 @@ export class Interface extends Class {
/** Control flow flags indicating specific conditions. */
export const enum FlowFlags {
/** No specific conditions. */
NONE = 0,
/** This branch always returns. */
RETURNS = 1 << 0,
THROWS = 1 << 1
/** This branch possibly throws. */
POSSIBLY_THROWS = 1 << 1,
}
/** A control flow evaluator. */
@ -2147,6 +2150,7 @@ export class Flow {
/** Creates the parent flow of the specified function. */
static create(currentFunction: Function): Flow {
var parentFlow = new Flow();
parentFlow.parent = null;
parentFlow.flags = FlowFlags.NONE;
parentFlow.currentFunction = currentFunction;
parentFlow.continueLabel = null;
@ -2162,8 +2166,8 @@ export class Flow {
/** Sets the specified flag or flags. */
set(flag: FlowFlags): void { this.flags |= flag; }
/** Enters a new branch and returns the new flow. */
enterBranch(): Flow {
/** Enters a new branch or scope and returns the new flow. */
enterBranchOrScope(): Flow {
var branchFlow = new Flow();
branchFlow.parent = this;
branchFlow.flags = this.flags;
@ -2173,14 +2177,21 @@ export class Flow {
return branchFlow;
}
/** Leaves the current branch and returns the parent flow. */
leaveBranch(): Flow {
/** Leaves the current branch or scope and returns the parent flow. */
leaveBranchOrScope(): Flow {
var parent = assert(this.parent);
if (this.scopedLocals) {
for (var scopedLocal of this.scopedLocals.values())
this.currentFunction.freeTempLocal(scopedLocal);
this.scopedLocals = null;
}
return assert(this.parent);
// Mark parent as THROWS if any child throws
if (this.is(FlowFlags.POSSIBLY_THROWS))
parent.set(FlowFlags.POSSIBLY_THROWS);
this.continueLabel = null;
this.breakLabel = null;
return parent;
}
/** Adds a new scoped local of the specified name. */
@ -2197,7 +2208,6 @@ export class Flow {
/** Gets the local of the specified name in the current scope. */
getScopedLocal(name: string): Local | null {
// console.log("checking: " + name);
var local: Local | null;
var current: Flow | null = this;
do {
@ -2206,4 +2216,12 @@ export class Flow {
} while (current = current.parent);
return this.currentFunction.locals.get(name);
}
/** Finalizes this flow. Must be the topmost parent flow of the function. */
finalize(): bool {
assert(this.parent == null, "must be the topmost parent flow");
this.continueLabel = null;
this.breakLabel = null;
return this.is(FlowFlags.RETURNS);
}
}