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refactor(extmarks): use a more efficient representation

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marktree.c was originally constructed as a "generic" datatype,
to make the prototyping of its internal logic as simple as possible
and also as the usecases for various kinds of extmarks/decorations was not yet decided.
As a consequence of this, various extra indirections and allocations was
needed to use marktree to implement extmarks (ns/id pairs) and
decorations of different kinds (some which is just a single highlight
id, other an allocated list of virtual text/lines)

This change removes a lot of indirection, by making Marktree specialized
for the usecase. In particular, the namespace id and mark id is stored
directly, instead of the 64-bit global id particular to the Marktree
struct. This removes the two maps needed to convert between global and
per-ns ids.

Also, "small" decorations are stored inline, i.e. those who
doesn't refer to external heap memory anyway. That is highlights (with
priority+flags) are stored inline, while virtual text, which anyway
occurs a lot of heap allocations, do not. (previously a hack was used
to elide heap allocations for highlights with standard prio+flags)

TODO(bfredl): the functionaltest-lua CI version of gcc is having
severe issues with uint16_t bitfields, so splitting up compound
assignments and redundant casts are needed. Clean this up once we switch
to a working compiler version.
This commit is contained in:
Björn Linse
2021-10-25 21:51:29 +02:00
parent c09147aad9
commit 95ab979fde
15 changed files with 462 additions and 460 deletions
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5
src/nvim/map.c
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@@ -171,10 +171,7 @@ MAP_IMPL(ptr_t, ptr_t, DEFAULT_INITIALIZER)
MAP_IMPL(uint64_t, ptr_t, DEFAULT_INITIALIZER)
MAP_IMPL(uint64_t, ssize_t, SSIZE_INITIALIZER)
MAP_IMPL(uint64_t, uint64_t, DEFAULT_INITIALIZER)
#define EXTMARK_NS_INITIALIZER { { MAP_INIT }, 1 }
MAP_IMPL(uint64_t, ExtmarkNs, EXTMARK_NS_INITIALIZER)
#define EXTMARK_ITEM_INITIALIZER { 0, 0, NULL }
MAP_IMPL(uint64_t, ExtmarkItem, EXTMARK_ITEM_INITIALIZER)
MAP_IMPL(uint32_t, uint32_t, DEFAULT_INITIALIZER)
MAP_IMPL(handle_T, ptr_t, DEFAULT_INITIALIZER)
#define MSGPACK_HANDLER_INITIALIZER { .fn = NULL, .fast = false }
MAP_IMPL(String, MsgpackRpcRequestHandler, MSGPACK_HANDLER_INITIALIZER)