Enum VmError 

pub enum VmError {
    Read(NcsReadError),
    Unsupported {
        offset: usize,
        opcode: NcsOpcode,
        auxcode: NcsAuxCode,
        message: String,
    },
    StackUnderflow {
        message: String,
    },
    TypeMismatch {
        offset: usize,
        message: String,
        expected: Option<&'static str>,
        actual: &'static str,
    },
    InvalidInstructionPointer {
        offset: usize,
    },
    InvalidExtra {
        offset: usize,
        opcode: NcsOpcode,
        auxcode: NcsAuxCode,
        message: String,
    },
    InvalidCommand {
        offset: usize,
        command: u16,
    },
    Setup {
        message: String,
    },
    InstructionLimitExceeded {
        offset: usize,
        limit: usize,
    },
}

Errors returned while executing NCS bytecode.

Variants

Read(NcsReadError)

Decoding the bytecode stream failed before execution began.

Unsupported

One instruction requested a feature this VM does not yet implement.

Fields

offset: usize

Byte offset of the instruction within the code section.

opcode: NcsOpcode

Opcode that failed.

auxcode: NcsAuxCode

Auxcode that failed.

message: String

Human-readable explanation.

StackUnderflow

One stack access ran past the available values.

Fields

message: String

Human-readable explanation.

TypeMismatch

One instruction expected a value of a different runtime type.

Fields

offset: usize

Byte offset of the instruction within the code section.

message: String

Human-readable explanation.

expected: Option<&'static str>

Optional expected type description.

actual: &'static str

Actual runtime value kind.

InvalidInstructionPointer

One jump or return target did not point at a valid instruction.

Fields

offset: usize

Byte offset that could not be resolved.

InvalidExtra

One opcode payload was malformed.

Fields

offset: usize

Byte offset of the instruction within the code section.

opcode: NcsOpcode

Opcode whose payload failed.

auxcode: NcsAuxCode

Auxcode whose payload failed.

message: String

Human-readable explanation.

InvalidCommand

One command id was invoked without a registered handler.

Fields

offset: usize

Byte offset of the ACTION instruction.

command: u16

Unhandled command id.

Setup

One host-side setup or invocation request was invalid before execution.

Fields

message: String

Human-readable explanation.

InstructionLimitExceeded

One VM run exceeded the configured instruction budget.

Fields

offset: usize

Byte offset of the instruction that would execute next.

limit: usize

Maximum instruction count allowed for the run.

Implementations

impl VmError

pub fn code(&self) -> Option<CompilerErrorCode>

Returns the closest upstream-aligned VM/compiler error code when one exists.

Trait Implementations

impl Debug for VmError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for VmError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for VmError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<NcsReadError> for VmError

fn from(value: NcsReadError) -> Self

Converts to this type from the input type.