Crate rustc_incremental[−][src]
Expand description
Support for serializing the dep-graph and reloading it.
Modules
This pass is only used for the UNIT TESTS and DEBUGGING NEEDS
around dependency graph construction. It serves two purposes; it
will dump graphs in graphviz form to disk, and it searches for
#[rustc_if_this_changed] and #[rustc_then_this_would_need]
annotations. These annotations can be used to test whether paths
exist in the graph. These checks run after codegen, so they view the
the final state of the dependency graph. Note that there are
similar assertions found in persist::dirty_clean which check the
initial state of the dependency graph, just after it has been
loaded from disk.
This pass is only used for UNIT TESTS related to incremental
compilation. It tests whether a particular .o file will be re-used
from a previous compilation or whether it must be regenerated.
When in incremental mode, this pass dumps out the dependency graph into the given directory. At the same time, it also hashes the various HIR nodes.
Enums
Functions
This function finalizes and thus ‘publishes’ the session directory by
renaming it to s-{timestamp}-{svh} and releasing the file lock.
If there have been compilation errors, however, this function will just
delete the presumably invalid session directory.
Launch a thread and load the dependency graph in the background.
Attempts to load the query result cache from disk
Allocates the private session directory. The boolean in the Ok() result
indicates whether we should try loading a dep graph from the successfully
initialized directory, or not.
The post-condition of this fn is that we have a valid incremental
compilation session directory, if the result is Ok. A valid session
directory is one that contains a locked lock file. It may or may not contain
a dep-graph and work products from a previous session.
If the call fails, the fn may leave behind an invalid session directory.
The garbage collection will take care of it.
Save and dump the DepGraph.