@neo-one/smart-contract-compiler/dist/esm/compile/sb/JumpTable.js

NEO•ONE TypeScript smart contract compiler.

export class JumpTable {
    constructor() {
        this.mutableJumpNumber = 0;
        this.mutableTable = [];
    }
    add(sb, node, body) {
        const jumpNumber = this.mutableJumpNumber;
        this.mutableJumpNumber += 1;
        const { bytecode } = sb.capture(() => {
            body();
        });
        this.mutableTable.push({ jumpNumber, node, bytecode });
        return jumpNumber;
    }
    emitTable(sb, outerNode) {
        this.mutableTable.forEach(({ node, jumpNumber, bytecode }) => {
            sb.emitHelper(node, {}, sb.helpers.if({
                condition: () => {
                    sb.emitOp(node, 'DUP');
                    sb.emitPushInt(node, jumpNumber);
                    sb.emitOp(node, 'NUMEQUAL');
                },
                whenTrue: () => {
                    sb.emitOp(node, 'DROP');
                    sb.emitBytecode(bytecode);
                },
            }));
        });
        sb.emitOp(outerNode, 'THROW');
    }
}

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