Error when generating Json file

Hello,

Could you please let me know why am I getting error(in red) when trying to generate a Json file.

Below is the code

/*** * H E A D E R S * ***/

typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t;

header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; }

header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen; bit<16> identification; bit<3> flags; bit<13> fragOffset; bit<8> ttl; bit<8> protocol; bit<16> hdrChecksum; ip4Addr_t srcAddr; ip4Addr_t dstAddr; }

struct metadata { / empty / }

struct headers { ethernet_t ethernet; ipv4_t ipv4; }

/*** * P A R S E R * ***/

parser ParserImpl(packet_in packet, out headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) {

state start {
    transition parse_ethernet;
}

state parse_ethernet {
    packet.extract(hdr.ethernet);
    transition select(hdr.ethernet.etherType) {
        TYPE_IPV4: parse_ipv4;
        default: accept;
    }
}

state parse_ipv4 {
    packet.extract(hdr.ipv4);
    transition accept;
}

}

/***** **** C H E C K S U M V E R I F I C A T I O N * *****/

control verifyChecksum(inout headers hdr, inout metadata meta) { apply { } }

/*** ** I N G R E S S P R O C E S S I N G * *****/

control ingress(inout headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) { action drop() { mark_to_drop(); }

action ipv4_forward(macAddr_t dstAddr, egressSpec_t port) {
    standard_metadata.egress_spec = port;
    hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
    hdr.ethernet.dstAddr = dstAddr;
    hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
}

table ipv4_lpm {
    key = {
        hdr.ipv4.dstAddr: lpm;
    }
    actions = {
        ipv4_forward;
        drop;
        NoAction;
    }
    size = 1024;
    default_action = NoAction();
}

apply {
    if (hdr.ipv4.isValid()) {
        ipv4_lpm.apply();
    }
}

}

/*** **** E G R E S S P R O C E S S I N G * *****/

control egress(inout headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) { apply { } }

/***** * C H E C K S U M C O M P U T A T I O N ** *****/

control computeChecksum( inout headers hdr, inout metadata meta) { apply { update_checksum(true, { hdr.ipv4.version, hdr.ipv4.ihl, hdr.ipv4.diffserv, hdr.ipv4.totalLen, hdr.ipv4.identification, hdr.ipv4.flags, hdr.ipv4.fragOffset, hdr.ipv4.ttl, hdr.ipv4.protocol, hdr.ipv4.srcAddr, hdr.ipv4.dstAddr }, hdr.ipv4.hdrChecksum, HashAlgorithm.csum16); } }

/*** * D E P A R S E R * ***/

control DeparserImpl(packet_out packet, in headers hdr) { apply { packet.emit(hdr.ethernet); packet.emit(hdr.ipv4); } }

/*** * S W I T C H * ***/

V1Switch( ParserImpl(), verifyChecksum(), ingress(), egress(), computeChecksum(), DeparserImpl() ) main;

p4lang / p4c-bm

Error when generating Json file #103