git/blob.c, branch v2.20.2

blob: allow lookup_blob to handle arbitrary repositories

2018-06-29T17:43:39Z

Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

blob: add repository argument to lookup_blob

2018-06-29T17:43:38Z

Add a repository argument to allow the callers of lookup_blob to be more specific about which repository to act on. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Jonathan Nieder Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

object: add repository argument to object_as_type

2018-06-29T17:43:38Z

Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

object: add repository argument to lookup_object

2018-06-29T17:43:38Z

Add a repository argument to allow callers of lookup_object to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

alloc: allow arbitrary repositories for alloc functions

2018-05-16T02:16:50Z

We have to convert all of the alloc functions at once, because alloc_report uses a funky macro for reporting. It is better for the sake of mechanical conversion to convert multiple functions at once rather than changing the structure of the reporting function. We record all memory allocation in alloc.c, and free them in clear_alloc_state, which is called for all repositories except the_repository. Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

alloc: add repository argument to alloc_blob_node

2018-05-09T03:12:36Z

This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. Use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

object: add repository argument to create_object

2018-05-09T03:12:36Z

Add a repository argument to allow the callers of create_object to be more specific about which repository to act on. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. Signed-off-by: Jonathan Nieder Signed-off-by: Stefan Beller Signed-off-by: Junio C Hamano

Convert lookup_blob to struct object_id

2017-05-08T06:12:57Z

Convert lookup_blob to take a pointer to struct object_id. The commit was created with manual changes to blob.c and blob.h, plus the following semantic patch: @@ expression E1; @@ - lookup_blob(E1.hash) + lookup_blob(&E1) @@ expression E1; @@ - lookup_blob(E1->hash) + lookup_blob(E1) Signed-off-by: brian m. carlson Signed-off-by: Junio C Hamano

add object_as_type helper for casting objects

2014-07-14T01:59:05Z

When we call lookup_commit, lookup_tree, etc, the logic goes something like: 1. Look for an existing object struct. If we don't have one, allocate and return a new one. 2. Double check that any object we have is the expected type (and complain and return NULL otherwise). 3. Convert an object with type OBJ_NONE (from a prior call to lookup_unknown_object) to the expected type. We can encapsulate steps 2 and 3 in a helper function which checks whether we have the expected object type, converts OBJ_NONE as appropriate, and returns the object. Not only does this shorten the code, but it also provides one central location for converting OBJ_NONE objects into objects of other types. Future patches will use that to enforce type-specific invariants. Since this is a refactoring, we would want it to behave exactly as the current code. It takes a little reasoning to see that this is the case: - for lookup_{commit,tree,etc} functions, we are just pulling steps 2 and 3 into a function that does the same thing. - for the call in peel_object, we currently only do step 3 (but we want to consolidate it with the others, as mentioned above). However, step 2 is a noop here, as the surrounding conditional makes sure we have OBJ_NONE (which we want to keep to avoid an extraneous call to sha1_object_info). - for the call in lookup_commit_reference_gently, we are currently doing step 2 but not step 3. However, step 3 is a noop here. The object we got will have just come from deref_tag, which must have figured out the type for each object in order to know when to stop peeling. Therefore the type will never be OBJ_NONE. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano

move setting of object->type to alloc_* functions

2014-07-14T01:59:05Z

The "struct object" type implements basic object polymorphism. Individual instances are allocated as concrete types (or as a union type that can store any object), and a "struct object *" can be cast into its real type after examining its "type" enum. This means it is dangerous to have a type field that does not match the allocation (e.g., setting the type field of a "struct blob" to "OBJ_COMMIT" would mean that a reader might read past the allocated memory). In most of the current code this is not a problem; the first thing we do after allocating an object is usually to set its type field by passing it to create_object. However, the virtual commits we create in merge-recursive.c do not ever get their type set. This does not seem to have caused problems in practice, though (presumably because we always pass around a "struct commit" pointer and never even look at the type). We can fix this oversight and also make it harder for future code to get it wrong by setting the type directly in the object allocation functions. This will also make it easier to fix problems with commit index allocation, as we know that any object allocated by alloc_commit_node will meet the invariant that an object with an OBJ_COMMIT type field will have a unique index number. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano