pub struct CallGraph { /* private fields */ }Expand description
A CallGraph is a directed, acyclic graph which represents all of the edges between procedures formed by a caller/callee relationship.
More precisely, this graph can be used to perform the following analyses:
- What is the maximum call stack depth for a program?
- Are there any recursive procedure calls?
- Are there procedures which are unreachable from the program entrypoint?, i.e. dead code
- What is the set of procedures which are reachable from a given procedure, and which of those are (un)conditionally called?
A CallGraph is the actual graph underpinning the conceptual “module graph” of the linker, and the two are intrinsically linked to one another (i.e. a CallGraph is meaningless without the corresponding super::Linker state).
Implementations§
Source§impl CallGraph
impl CallGraph
Sourcepub fn out_edges(&self, gid: GlobalItemIndex) -> &[GlobalItemIndex]
pub fn out_edges(&self, gid: GlobalItemIndex) -> &[GlobalItemIndex]
Gets the set of edges from the given caller to its callees in the graph.
Sourcepub fn get_or_insert_node(
&mut self,
id: GlobalItemIndex,
) -> &mut Vec<GlobalItemIndex>
pub fn get_or_insert_node( &mut self, id: GlobalItemIndex, ) -> &mut Vec<GlobalItemIndex>
Inserts a node in the graph for id, if not already present.
Returns the set of GlobalItemIndex which are the outbound neighbors of id in the
graph, i.e. the callees of a call-like instruction.
Sourcepub fn add_edge(&mut self, caller: GlobalItemIndex, callee: GlobalItemIndex)
pub fn add_edge(&mut self, caller: GlobalItemIndex, callee: GlobalItemIndex)
Add an edge in the call graph from caller to callee.
This operation is unchecked, i.e. it is possible to introduce cycles in the graph using it. As a result, it is essential that the caller either know that adding the edge does not introduce a cycle, or that Self::toposort is run once the graph is built, in order to verify that the graph is valid and has no cycles.
NOTE: This function will panic if you attempt to add an edge from a function to itself, which trivially introduces a cycle. All other cycle-inducing edges must be caught by a call to Self::toposort.
Sourcepub fn remove_edge(&mut self, caller: GlobalItemIndex, callee: GlobalItemIndex)
pub fn remove_edge(&mut self, caller: GlobalItemIndex, callee: GlobalItemIndex)
Removes the edge between caller and callee from the graph
Sourcepub fn num_predecessors(&self, id: GlobalItemIndex) -> usize
pub fn num_predecessors(&self, id: GlobalItemIndex) -> usize
Returns the number of predecessors of id in the graph, i.e.
the number of procedures which call id.
Sourcepub fn toposort(&self) -> Result<Vec<GlobalItemIndex>, CycleError>
pub fn toposort(&self) -> Result<Vec<GlobalItemIndex>, CycleError>
Construct the topological ordering of all nodes in the call graph.
Returns Err if a cycle is detected in the graph
Sourcepub fn subgraph(&self, root: GlobalItemIndex) -> Self
pub fn subgraph(&self, root: GlobalItemIndex) -> Self
Gets a new graph which is a subgraph of self containing all of the nodes reachable from
root, and nothing else.
Sourcepub fn toposort_caller(
&self,
caller: GlobalItemIndex,
) -> Result<Vec<GlobalItemIndex>, CycleError>
pub fn toposort_caller( &self, caller: GlobalItemIndex, ) -> Result<Vec<GlobalItemIndex>, CycleError>
Constructs the topological ordering of nodes in the call graph, for which caller is an
ancestor.
§Errors
Returns an error if a cycle is detected in the graph.
Trait Implementations§
Auto Trait Implementations§
impl Freeze for CallGraph
impl RefUnwindSafe for CallGraph
impl Send for CallGraph
impl Sync for CallGraph
impl Unpin for CallGraph
impl UnwindSafe for CallGraph
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