pub struct Variable {
pub parent_key: ObjectRef,
pub name: VariableName,
pub source_location: SourceLocation,
pub language: DwLang,
pub type_name: VariableType,
pub variable_node_type: VariableNodeType,
pub memory_location: VariableLocation,
pub byte_size: Option<u64>,
pub member_index: Option<i64>,
pub role: VariantRole,
/* private fields */
}
Expand description
The Variable
struct is used in conjunction with VariableCache
to cache data about variables.
Any modifications to the Variable
value will be transient (lost when it goes out of scope),
unless it is updated through one of the available methods on VariableCache
.
Fields§
§parent_key: ObjectRef
Every variable must have a unique parent assigned to it when stored in the VariableCache.
name: VariableName
The variable name refers to the name of any of the types of values described in the VariableCache
source_location: SourceLocation
The source location of the declaration of this variable, if available.
language: DwLang
Programming language of the defining compilation unit.
type_name: VariableType
The name of the type of this variable.
variable_node_type: VariableNodeType
For ‘lazy loading’ of certain variable types we have to determine if the variable recursion should be deferred, and if so, how to resolve it when the request for further recursion happens. See VariableNodeType for more information.
memory_location: VariableLocation
The starting location/address in memory where this Variable’s value is stored.
byte_size: Option<u64>
The size of this variable in bytes.
member_index: Option<i64>
If this is a subrange (array, vector, etc.), is the ordinal position of this variable in that range
role: VariantRole
The role of this variable.
Implementations§
source§impl Variable
impl Variable
sourcepub fn new(unit_info: Option<&UnitInfo>) -> Variable
pub fn new(unit_info: Option<&UnitInfo>) -> Variable
In most cases, Variables will be initialized with their ELF references so that we resolve their data types and values on demand.
sourcepub fn variable_key(&self) -> ObjectRef
pub fn variable_key(&self) -> ObjectRef
Get a unique key for this variable.
sourcepub fn set_value(&mut self, new_value: VariableValue)
pub fn set_value(&mut self, new_value: VariableValue)
Implementing set_value(), because the library passes errors into the value of the variable. This ensures debug front ends can see the errors, but doesn’t fail because of a single variable not being able to decode correctly.
sourcepub fn update_value(
&self,
memory: &mut impl MemoryInterface,
variable_cache: &mut VariableCache,
new_value: String
) -> Result<(), DebugError>
pub fn update_value( &self, memory: &mut impl MemoryInterface, variable_cache: &mut VariableCache, new_value: String ) -> Result<(), DebugError>
Convert the String value into the appropriate memory format and update the target memory with the new value. Currently this only works for base data types. There is no provision in the MS DAP API to catch this client side, so we can only respond with a ‘gentle’ error message if the user attempts unsupported data types.
sourcepub fn get_value(&self, variable_cache: &VariableCache) -> String
pub fn get_value(&self, variable_cache: &VariableCache) -> String
Implementing get_value(), because Variable.value has to be private (a requirement of updating the value without overriding earlier values … see set_value()).
sourcepub fn extract_value(
&mut self,
memory: &mut dyn MemoryInterface,
variable_cache: &VariableCache
)
pub fn extract_value( &mut self, memory: &mut dyn MemoryInterface, variable_cache: &VariableCache )
Evaluate the variable’s result if possible and set self.value, or else set self.value as the error String.
sourcepub fn is_indexed(&self) -> bool
pub fn is_indexed(&self) -> bool
The variable is considered to be an ‘indexed’ variable if the name starts with two underscores followed by a number. e.g. “__1”.
TODO: Consider replacing this logic with std::str::pattern::Pattern
when that API stabilizes
sourcepub fn is_valid(&self) -> bool
pub fn is_valid(&self) -> bool
true
if the Variable has a valid value, or an empty value.
false
if the Variable has a VariableValue::Error(_) value
sourcepub fn memory_range(&self) -> Option<Range<u64>>
pub fn memory_range(&self) -> Option<Range<u64>>
Calculate the memory range that contains the value of this variable. If the location and/or byte size is not known, then return None. Note: We don’t do any validation of the memory range here, and leave it up to the caller to validate the memory ranges before attempting to read them.
Trait Implementations§
source§impl PartialEq for Variable
impl PartialEq for Variable
impl Eq for Variable
impl StructuralPartialEq for Variable
Auto Trait Implementations§
impl RefUnwindSafe for Variable
impl Send for Variable
impl Sync for Variable
impl Unpin for Variable
impl UnwindSafe for Variable
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