Mercurial > vim
view src/vim9type.c @ 32936:c517845bd10e v9.0.1776
patch 9.0.1776: No support for stable Python 3 ABI
Commit: https://github.com/vim/vim/commit/c13b3d1350b60b94fe87f0761ea31c0e7fb6ebf3
Author: Yee Cheng Chin <ychin.git@gmail.com>
Date: Sun Aug 20 21:18:38 2023 +0200
patch 9.0.1776: No support for stable Python 3 ABI
Problem: No support for stable Python 3 ABI
Solution: Support Python 3 stable ABI
Commits:
1) Support Python 3 stable ABI to allow mixed version interoperatbility
Vim currently supports embedding Python for use with plugins, and the
"dynamic" linking option allows the user to specify a locally installed
version of Python by setting `pythonthreedll`. However, one caveat is
that the Python 3 libs are not binary compatible across minor versions,
and mixing versions can potentially be dangerous (e.g. let's say Vim was
linked against the Python 3.10 SDK, but the user sets `pythonthreedll`
to a 3.11 lib). Usually, nothing bad happens, but in theory this could
lead to crashes, memory corruption, and other unpredictable behaviors.
It's also difficult for the user to tell something is wrong because Vim
has no way of reporting what Python 3 version Vim was linked with.
For Vim installed via a package manager, this usually isn't an issue
because all the dependencies would already be figured out. For prebuilt
Vim binaries like MacVim (my motivation for working on this), AppImage,
and Win32 installer this could potentially be an issue as usually a
single binary is distributed. This is more tricky when a new Python
version is released, as there's a chicken-and-egg issue with deciding
what Python version to build against and hard to keep in sync when a new
Python version just drops and we have a mix of users of different Python
versions, and a user just blindly upgrading to a new Python could lead to
bad interactions with Vim.
Python 3 does have a solution for this problem: stable ABI / limited API
(see https://docs.python.org/3/c-api/stable.html). The C SDK limits the
API to a set of functions that are promised to be stable across
versions. This pull request adds an ifdef config that allows us to turn
it on when building Vim. Vim binaries built with this option should be
safe to freely link with any Python 3 libraies without having the
constraint of having to use the same minor version.
Note: Python 2 has no such concept and this doesn't change how Python 2
integration works (not that there is going to be a new version of Python
2 that would cause compatibility issues in the future anyway).
---
Technical details:
======
The stable ABI can be accessed when we compile with the Python 3 limited
API (by defining `Py_LIMITED_API`). The Python 3 code (in `if_python3.c`
and `if_py_both.h`) would now handle this and switch to limited API
mode. Without it set, Vim will still use the full API as before so this
is an opt-in change.
The main difference is that `PyType_Object` is now an opaque struct that
we can't directly create "static types" out of, and we have to create
type objects as "heap types" instead. This is because the struct is not
stable and changes from version to version (e.g. 3.8 added a
`tp_vectorcall` field to it). I had to change all the types to be
allocated on the heap instead with just a pointer to them.
Other functions are also simply missing in limited API, or they are
introduced too late (e.g. `PyUnicode_AsUTF8AndSize` in 3.10) to it that
we need some other ways to do the same thing, so I had to abstract a few
things into macros, and sometimes re-implement functions like
`PyObject_NEW`.
One caveat is that in limited API, `OutputType` (used for replacing
`sys.stdout`) no longer inherits from `PyStdPrinter_Type` which I don't
think has any real issue other than minor differences in how they
convert to a string and missing a couple functions like `mode()` and
`fileno()`.
Also fixed an existing bug where `tp_basicsize` was set incorrectly for
`BufferObject`, `TabListObject, `WinListObject`.
Technically, there could be a small performance drop, there is a little
more indirection with accessing type objects, and some APIs like
`PyUnicode_AsUTF8AndSize` are missing, but in practice I didn't see any
difference, and any well-written Python plugin should try to avoid
excessing callbacks to the `vim` module in Python anyway.
I only tested limited API mode down to Python 3.7, which seemes to
compile and work fine. I haven't tried earlier Python versions.
2) Fix PyIter_Check on older Python vers / type##Ptr unused warning
For PyIter_Check, older versions exposed them as either macros (used in
full API), or a function (for use in limited API). A previous change
exposed PyIter_Check to the dynamic build because Python just moved it
to function-only in 3.10 anyway. Because of that, just make sure we
always grab the function in dynamic builds in earlier versions since
that's what Python eventually did anyway.
3) Move Py_LIMITED_API define to configure script
Can now use --with-python-stable-abi flag to customize what stable ABI
version to target. Can also use an env var to do so as well.
4) Show +python/dyn-stable in :version, and allow has() feature query
Not sure if the "/dyn-stable" suffix would break things, or whether we
should do it another way. Or just don't show it in version and rely on
has() feature checking.
5) Documentation first draft. Still need to implement v:python3_version
6) Fix PyIter_Check build breaks when compiling against Python 3.8
7) Add CI coverage stable ABI on Linux/Windows / make configurable on Windows
This adds configurable options for Windows make files (both MinGW and
MSVC). CI will also now exercise both traditional full API and stable
ABI for Linux and Windows in the matrix for coverage.
Also added a "dynamic" option to Linux matrix as a drive-by change to
make other scripting languages like Ruby / Perl testable under both
static and dynamic builds.
8) Fix inaccuracy in Windows docs
Python's own docs are confusing but you don't actually want to use
`python3.dll` for the dynamic linkage.
9) Add generated autoconf file
10) Add v:python3_version support
This variable indicates the version of Python3 that Vim was built
against (PY_VERSION_HEX), and will be useful to check whether the Python
library you are loading in dynamically actually fits it. When built with
stable ABI, it will be the limited ABI version instead
(`Py_LIMITED_API`), which indicates the minimum version of Python 3 the
user should have, rather than the exact match. When stable ABI is used,
we won't be exposing PY_VERSION_HEX in this var because it just doesn't
seem necessary to do so (the whole point of stable ABI is the promise
that it will work across versions), and I don't want to confuse the user
with too many variables.
Also, cleaned up some documentation, and added help tags.
11) Fix Python 3.7 compat issues
Fix a couple issues when using limited API < 3.8
- Crash on exit: In Python 3.7, if a heap-allocated type is destroyed
before all instances are, it would cause a crash later. This happens
when we destroyed `OptionsType` before calling `Py_Finalize` when
using the limited API. To make it worse, later versions changed the
semantics and now each instance has a strong reference to its own type
and the recommendation has changed to have each instance de-ref its
own type and have its type in GC traversal. To avoid dealing with
these cross-version variations, we just don't free the heap type. They
are static types in non-limited-API anyway and are designed to last
through the entirety of the app, and we also don't restart the Python
runtime and therefore do not need it to have absolutely 0 leaks.
See:
- https://docs.python.org/3/whatsnew/3.8.html#changes-in-the-c-api
- https://docs.python.org/3/whatsnew/3.9.html#changes-in-the-c-api
- PyIter_Check: This function is not provided in limited APIs older than
3.8. Previously I was trying to mock it out using manual
PyType_GetSlot() but it was brittle and also does not actually work
properly for static types (it will generate a Python error). Just
return false. It does mean using limited API < 3.8 is not recommended
as you lose the functionality to handle iterators, but from playing
with plugins I couldn't find it to be an issue.
- Fix loading of PyIter_Check so it will be done when limited API < 3.8.
Otherwise loading a 3.7 Python lib will fail even if limited API was
specified to use it.
12) Make sure to only load `PyUnicode_AsUTF8AndSize` in needed in limited API
We don't use this function unless limited API >= 3.10, but we were
loading it regardless. Usually it's ok in Unix-like systems where Python
just has a single lib that we load from, but in Windows where there is a
separate python3.dll this would not work as the symbol would not have
been exposed in this more limited DLL file. This makes it much clearer
under what condition is this function needed.
closes: #12032
Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yee Cheng Chin <ychin.git@gmail.com>
author | Christian Brabandt <cb@256bit.org> |
---|---|
date | Sun, 20 Aug 2023 21:30:04 +0200 |
parents | e5a1319f3e25 |
children | e4851934751a |
line wrap: on
line source
/* vi:set ts=8 sts=4 sw=4 noet: * * VIM - Vi IMproved by Bram Moolenaar * * Do ":help uganda" in Vim to read copying and usage conditions. * Do ":help credits" in Vim to see a list of people who contributed. * See README.txt for an overview of the Vim source code. */ /* * vim9type.c: handling of types */ #define USING_FLOAT_STUFF #include "vim.h" #if defined(FEAT_EVAL) || defined(PROTO) #ifdef VMS # include <float.h> #endif // When not generating protos this is included in proto.h #ifdef PROTO # include "vim9.h" #endif /* * Allocate memory for a type_T and add the pointer to type_gap, so that it can * be easily freed later. */ type_T * get_type_ptr(garray_T *type_gap) { type_T *type; if (ga_grow(type_gap, 1) == FAIL) return NULL; type = ALLOC_CLEAR_ONE(type_T); if (type == NULL) return NULL; ((type_T **)type_gap->ga_data)[type_gap->ga_len] = type; ++type_gap->ga_len; return type; } /* * Make a shallow copy of "type". * When allocation fails returns "type". */ type_T * copy_type(type_T *type, garray_T *type_gap) { type_T *copy = get_type_ptr(type_gap); if (copy == NULL) return type; *copy = *type; copy->tt_flags &= ~TTFLAG_STATIC; if (type->tt_args != NULL && func_type_add_arg_types(copy, type->tt_argcount, type_gap) == OK) for (int i = 0; i < type->tt_argcount; ++i) copy->tt_args[i] = type->tt_args[i]; return copy; } /* * Inner part of copy_type_deep(). * When allocation fails returns "type". */ static type_T * copy_type_deep_rec(type_T *type, garray_T *type_gap, garray_T *seen_types) { for (int i = 0; i < seen_types->ga_len; ++i) if (((type_T **)seen_types->ga_data)[i * 2] == type) // seen this type before, return the copy we made return ((type_T **)seen_types->ga_data)[i * 2 + 1]; type_T *copy = copy_type(type, type_gap); if (ga_grow(seen_types, 1) == FAIL) return copy; ((type_T **)seen_types->ga_data)[seen_types->ga_len * 2] = type; ((type_T **)seen_types->ga_data)[seen_types->ga_len * 2 + 1] = copy; ++seen_types->ga_len; if (copy->tt_member != NULL) copy->tt_member = copy_type_deep_rec(copy->tt_member, type_gap, seen_types); if (type->tt_args != NULL) for (int i = 0; i < type->tt_argcount; ++i) copy->tt_args[i] = copy_type_deep_rec(copy->tt_args[i], type_gap, seen_types); return copy; } /* * Make a deep copy of "type". * When allocation fails returns "type". */ static type_T * copy_type_deep(type_T *type, garray_T *type_gap) { garray_T seen_types; // stores type pairs : a type we have seen and the copy used ga_init2(&seen_types, sizeof(type_T *) * 2, 20); type_T *res = copy_type_deep_rec(type, type_gap, &seen_types); ga_clear(&seen_types); return res; } void clear_type_list(garray_T *gap) { while (gap->ga_len > 0) vim_free(((type_T **)gap->ga_data)[--gap->ga_len]); ga_clear(gap); } /* * Take a type that is using entries in a growarray and turn it into a type * with allocated entries. */ type_T * alloc_type(type_T *type) { type_T *ret; if (type == NULL) return NULL; // A fixed type never contains allocated types, return as-is. if (type->tt_flags & TTFLAG_STATIC) return type; ret = ALLOC_ONE(type_T); *ret = *type; if (ret->tt_member != NULL) ret->tt_member = alloc_type(ret->tt_member); if (type->tt_args != NULL) { int i; ret->tt_args = ALLOC_MULT(type_T *, type->tt_argcount); if (ret->tt_args != NULL) for (i = 0; i < type->tt_argcount; ++i) ret->tt_args[i] = alloc_type(type->tt_args[i]); } return ret; } /* * Free a type that was created with alloc_type(). */ void free_type(type_T *type) { int i; if (type == NULL || (type->tt_flags & TTFLAG_STATIC)) return; if (type->tt_args != NULL) { for (i = 0; i < type->tt_argcount; ++i) free_type(type->tt_args[i]); vim_free(type->tt_args); } free_type(type->tt_member); vim_free(type); } /* * Return TRUE if "type" is to be recursed into for setting the type. */ static int set_tv_type_recurse(type_T *type) { return type->tt_member != NULL && (type->tt_member->tt_type == VAR_DICT || type->tt_member->tt_type == VAR_LIST) && type->tt_member->tt_member != NULL && type->tt_member->tt_member != &t_any && type->tt_member->tt_member != &t_unknown; } /* * Set the type of "tv" to "type" if it is a list or dict. */ void set_tv_type(typval_T *tv, type_T *type) { if (tv->v_type == VAR_DICT && tv->vval.v_dict != NULL) { dict_T *d = tv->vval.v_dict; if (d->dv_type != type) { free_type(d->dv_type); d->dv_type = alloc_type(type); if (set_tv_type_recurse(type)) { int todo = (int)d->dv_hashtab.ht_used; hashitem_T *hi; dictitem_T *di; FOR_ALL_HASHTAB_ITEMS(&d->dv_hashtab, hi, todo) { if (!HASHITEM_EMPTY(hi)) { --todo; di = HI2DI(hi); set_tv_type(&di->di_tv, type->tt_member); } } } } } else if (tv->v_type == VAR_LIST && tv->vval.v_list != NULL) { list_T *l = tv->vval.v_list; if (l->lv_type != type) { free_type(l->lv_type); l->lv_type = alloc_type(type); if (l->lv_first != &range_list_item && set_tv_type_recurse(type)) { listitem_T *li; FOR_ALL_LIST_ITEMS(l, li) set_tv_type(&li->li_tv, type->tt_member); } } } } type_T * get_list_type(type_T *member_type, garray_T *type_gap) { type_T *type; // recognize commonly used types if (member_type == NULL || member_type->tt_type == VAR_ANY) return &t_list_any; if (member_type->tt_type == VAR_VOID || member_type->tt_type == VAR_UNKNOWN) return &t_list_empty; if (member_type->tt_type == VAR_BOOL) return &t_list_bool; if (member_type->tt_type == VAR_NUMBER) return &t_list_number; if (member_type->tt_type == VAR_STRING) return &t_list_string; // Not a common type, create a new entry. type = get_type_ptr(type_gap); if (type == NULL) return &t_any; type->tt_type = VAR_LIST; type->tt_member = member_type; type->tt_argcount = 0; type->tt_args = NULL; return type; } type_T * get_dict_type(type_T *member_type, garray_T *type_gap) { type_T *type; // recognize commonly used types if (member_type == NULL || member_type->tt_type == VAR_ANY) return &t_dict_any; if (member_type->tt_type == VAR_VOID || member_type->tt_type == VAR_UNKNOWN) return &t_dict_empty; if (member_type->tt_type == VAR_BOOL) return &t_dict_bool; if (member_type->tt_type == VAR_NUMBER) return &t_dict_number; if (member_type->tt_type == VAR_STRING) return &t_dict_string; // Not a common type, create a new entry. type = get_type_ptr(type_gap); if (type == NULL) return &t_any; type->tt_type = VAR_DICT; type->tt_member = member_type; type->tt_argcount = 0; type->tt_args = NULL; return type; } /* * Allocate a new type for a function. */ type_T * alloc_func_type(type_T *ret_type, int argcount, garray_T *type_gap) { type_T *type = get_type_ptr(type_gap); if (type == NULL) return &t_any; type->tt_type = VAR_FUNC; type->tt_member = ret_type == NULL ? &t_unknown : ret_type; type->tt_argcount = argcount; type->tt_args = NULL; return type; } /* * Get a function type, based on the return type "ret_type". * "argcount" must be -1 or 0, a predefined type can be used. */ type_T * get_func_type(type_T *ret_type, int argcount, garray_T *type_gap) { // recognize commonly used types if (ret_type == &t_unknown || ret_type == NULL) { // (argcount == 0) is not possible return &t_func_unknown; } if (ret_type == &t_void) { if (argcount == 0) return &t_func_0_void; else return &t_func_void; } if (ret_type == &t_any) { if (argcount == 0) return &t_func_0_any; else return &t_func_any; } if (ret_type == &t_number) { if (argcount == 0) return &t_func_0_number; else return &t_func_number; } if (ret_type == &t_string) { if (argcount == 0) return &t_func_0_string; else return &t_func_string; } return alloc_func_type(ret_type, argcount, type_gap); } /* * For a function type, reserve space for "argcount" argument types (including * vararg). */ int func_type_add_arg_types( type_T *functype, int argcount, garray_T *type_gap) { // To make it easy to free the space needed for the argument types, add the // pointer to type_gap. if (ga_grow(type_gap, 1) == FAIL) return FAIL; functype->tt_args = ALLOC_CLEAR_MULT(type_T *, argcount); if (functype->tt_args == NULL) return FAIL; ((type_T **)type_gap->ga_data)[type_gap->ga_len] = (void *)functype->tt_args; ++type_gap->ga_len; return OK; } /* * Return TRUE if "type" is NULL, any or unknown. * This also works for const (comparing with &t_any and &t_unknown doesn't). */ int type_any_or_unknown(type_T *type) { return type == NULL || type->tt_type == VAR_ANY || type->tt_type == VAR_UNKNOWN; } /* * Get a type_T for a typval_T. * "type_gap" is used to temporarily create types in. * When "flags" has TVTT_DO_MEMBER also get the member type, otherwise use * "any". * When "flags" has TVTT_MORE_SPECIFIC get the more specific member type if it * is "any". */ static type_T * typval2type_int(typval_T *tv, int copyID, garray_T *type_gap, int flags) { type_T *type; type_T *member_type = NULL; class_T *class_type = NULL; int argcount = 0; int min_argcount = 0; if (tv->v_type == VAR_NUMBER) return &t_number; if (tv->v_type == VAR_BOOL) return &t_bool; if (tv->v_type == VAR_SPECIAL) { if (tv->vval.v_number == VVAL_NULL) return &t_null; if (tv->vval.v_number == VVAL_NONE) return &t_none; if (tv->vval.v_number == VVAL_TRUE || tv->vval.v_number == VVAL_FALSE) return &t_bool; return &t_unknown; } if (tv->v_type == VAR_STRING) return &t_string; if (tv->v_type == VAR_BLOB) { if (tv->vval.v_blob == NULL) return &t_blob_null; return &t_blob; } if (tv->v_type == VAR_LIST) { list_T *l = tv->vval.v_list; listitem_T *li; // An empty list has type list<unknown>, unless the type was specified // and is not list<any>. This matters when assigning to a variable // with a specific list type. if (l == NULL || (l->lv_first == NULL && (l->lv_type == NULL || l->lv_type->tt_member == &t_any))) return &t_list_empty; if ((flags & TVTT_DO_MEMBER) == 0) return &t_list_any; // If the type is list<any> go through the members, it may end up a // more specific type. if (l->lv_type != NULL && (l->lv_first == NULL || (flags & TVTT_MORE_SPECIFIC) == 0 || l->lv_type->tt_member != &t_any)) // make a copy, lv_type may be freed if the list is freed return copy_type_deep(l->lv_type, type_gap); if (l->lv_first == &range_list_item) return &t_list_number; if (l->lv_copyID == copyID) // avoid recursion return &t_list_any; l->lv_copyID = copyID; // Use the common type of all members. member_type = typval2type(&l->lv_first->li_tv, copyID, type_gap, TVTT_DO_MEMBER); for (li = l->lv_first->li_next; li != NULL; li = li->li_next) common_type(typval2type(&li->li_tv, copyID, type_gap, TVTT_DO_MEMBER), member_type, &member_type, type_gap); return get_list_type(member_type, type_gap); } if (tv->v_type == VAR_DICT) { dict_iterator_T iter; typval_T *value; dict_T *d = tv->vval.v_dict; if (d == NULL || (d->dv_hashtab.ht_used == 0 && d->dv_type == NULL)) return &t_dict_empty; if ((flags & TVTT_DO_MEMBER) == 0) return &t_dict_any; // If the type is dict<any> go through the members, it may end up a // more specific type. if (d->dv_type != NULL && (d->dv_hashtab.ht_used == 0 || (flags & TVTT_MORE_SPECIFIC) == 0 || d->dv_type->tt_member != &t_any)) return d->dv_type; if (d->dv_copyID == copyID) // avoid recursion return &t_dict_any; d->dv_copyID = copyID; // Use the common type of all values. dict_iterate_start(tv, &iter); dict_iterate_next(&iter, &value); member_type = typval2type(value, copyID, type_gap, TVTT_DO_MEMBER); while (dict_iterate_next(&iter, &value) != NULL) common_type(typval2type(value, copyID, type_gap, TVTT_DO_MEMBER), member_type, &member_type, type_gap); return get_dict_type(member_type, type_gap); } if (tv->v_type == VAR_FUNC || tv->v_type == VAR_PARTIAL) { char_u *name = NULL; ufunc_T *ufunc = NULL; if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial != NULL) { if (tv->vval.v_partial->pt_func != NULL) ufunc = tv->vval.v_partial->pt_func; else name = tv->vval.v_partial->pt_name; } else name = tv->vval.v_string; if (name == NULL && ufunc == NULL) return &t_func_unknown; if (name != NULL) { int idx = find_internal_func(name); if (idx >= 0) { type_T *decl_type; // unused internal_func_get_argcount(idx, &argcount, &min_argcount); member_type = internal_func_ret_type(idx, 0, NULL, &decl_type, type_gap); } else ufunc = find_func(name, FALSE); } if (ufunc != NULL) { // May need to get the argument types from default values by // compiling the function. if (ufunc->uf_def_status == UF_TO_BE_COMPILED && compile_def_function(ufunc, TRUE, CT_NONE, NULL) == FAIL) return NULL; if (ufunc->uf_func_type == NULL) set_function_type(ufunc); if (ufunc->uf_func_type != NULL) { if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial != NULL && tv->vval.v_partial->pt_argc > 0) { type = get_type_ptr(type_gap); if (type == NULL) return NULL; *type = *ufunc->uf_func_type; if (type->tt_argcount >= 0) { type->tt_argcount -= tv->vval.v_partial->pt_argc; type->tt_min_argcount -= tv->vval.v_partial->pt_argc; if (type->tt_argcount > 0 && func_type_add_arg_types(type, type->tt_argcount, type_gap) == OK) for (int i = 0; i < type->tt_argcount; ++i) type->tt_args[i] = ufunc->uf_func_type->tt_args[ i + tv->vval.v_partial->pt_argc]; } return type; } return ufunc->uf_func_type; } } } if (tv->v_type == VAR_CLASS) class_type = tv->vval.v_class; else if (tv->v_type == VAR_OBJECT && tv->vval.v_object != NULL) class_type = tv->vval.v_object->obj_class; type = get_type_ptr(type_gap); if (type == NULL) return NULL; type->tt_type = tv->v_type; type->tt_argcount = argcount; type->tt_min_argcount = min_argcount; if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial != NULL && tv->vval.v_partial->pt_argc > 0) { type->tt_argcount -= tv->vval.v_partial->pt_argc; type->tt_min_argcount -= tv->vval.v_partial->pt_argc; } type->tt_member = member_type; type->tt_class = class_type; return type; } /* * Return TRUE if "tv" is not a bool but should be converted to bool. */ int need_convert_to_bool(type_T *type, typval_T *tv) { return type != NULL && type == &t_bool && tv->v_type != VAR_BOOL && (tv->v_type == VAR_NUMBER && (tv->vval.v_number == 0 || tv->vval.v_number == 1)); } /* * Get a type_T for a typval_T. * "type_list" is used to temporarily create types in. * When "flags" has TVTT_DO_MEMBER also get the member type, otherwise use * "any". * When "flags" has TVTT_MORE_SPECIFIC get the most specific member type. */ type_T * typval2type(typval_T *tv, int copyID, garray_T *type_gap, int flags) { type_T *type = typval2type_int(tv, copyID, type_gap, flags); if (type == NULL) return NULL; if (type != &t_bool && (tv->v_type == VAR_NUMBER && (tv->vval.v_number == 0 || tv->vval.v_number == 1))) // Number 0 and 1 and expression with "&&" or "||" can also be used // for bool. type = &t_number_bool; else if (type != &t_float && tv->v_type == VAR_NUMBER) // A number can also be used for float. type = &t_number_float; return type; } /* * Return TRUE if "type" can be used for a variable declaration. * Give an error and return FALSE if not. */ int valid_declaration_type(type_T *type) { if (type->tt_type == VAR_SPECIAL // null, none || type->tt_type == VAR_VOID) { char *tofree = NULL; char *name = type_name(type, &tofree); semsg(_(e_invalid_type_for_object_member_str), name); vim_free(tofree); return FALSE; } return TRUE; } /* * Get a type_T for a typval_T, used for v: variables. * "type_list" is used to temporarily create types in. */ type_T * typval2type_vimvar(typval_T *tv, garray_T *type_gap) { if (tv->v_type == VAR_LIST) // e.g. for v:oldfiles return &t_list_string; if (tv->v_type == VAR_DICT) // e.g. for v:event return &t_dict_any; return typval2type(tv, get_copyID(), type_gap, TVTT_DO_MEMBER); } int check_typval_arg_type( type_T *expected, typval_T *actual_tv, char *func_name, int arg_idx) { where_T where = WHERE_INIT; if (arg_idx > 0) { where.wt_index = arg_idx; where.wt_kind = WT_ARGUMENT; } where.wt_func_name = func_name; return check_typval_type(expected, actual_tv, where); } /* * Return FAIL if "expected" and "actual" don't match. * When "argidx" > 0 it is included in the error message. */ int check_typval_type(type_T *expected, typval_T *actual_tv, where_T where) { garray_T type_list; type_T *actual_type; int res = FAIL; if (expected == NULL) return OK; // didn't expect anything. // ga_init2(&type_list, sizeof(type_T *), 10); // A null_function and null_partial are special cases, they can be used to // clear a variable. if ((actual_tv->v_type == VAR_FUNC && actual_tv->vval.v_string == NULL) || (actual_tv->v_type == VAR_PARTIAL && actual_tv->vval.v_partial == NULL)) actual_type = &t_func_unknown; else // When the actual type is list<any> or dict<any> go through the values // to possibly get a more specific type. actual_type = typval2type(actual_tv, get_copyID(), &type_list, TVTT_DO_MEMBER | TVTT_MORE_SPECIFIC); if (actual_type != NULL) { res = check_type_maybe(expected, actual_type, TRUE, where); if (res == MAYBE && !(actual_type->tt_type == VAR_FUNC && actual_type->tt_member == &t_unknown)) { // If a type check is needed that means assigning "any" or // "unknown" to a more specific type, which fails here. // Execpt when it looks like a lambda, since they have an // incomplete type. type_mismatch_where(expected, actual_type, where); res = FAIL; } } clear_type_list(&type_list); return res; } void arg_type_mismatch(type_T *expected, type_T *actual, int arg_idx) { where_T where = WHERE_INIT; if (arg_idx > 0) { where.wt_index = arg_idx; where.wt_kind = WT_ARGUMENT; } type_mismatch_where(expected, actual, where); } void type_mismatch_where(type_T *expected, type_T *actual, where_T where) { char *tofree1, *tofree2; char *typename1 = type_name(expected, &tofree1); char *typename2 = type_name(actual, &tofree2); switch (where.wt_kind) { case WT_MEMBER: semsg(_(e_member_str_type_mismatch_expected_str_but_got_str), where.wt_func_name, typename1, typename2); break; case WT_METHOD: semsg(_(e_method_str_type_mismatch_expected_str_but_got_str), where.wt_func_name, typename1, typename2); break; case WT_VARIABLE: if (where.wt_func_name == NULL) semsg(_(e_variable_nr_type_mismatch_expected_str_but_got_str), where.wt_index, typename1, typename2); else semsg(_(e_variable_nr_type_mismatch_expected_str_but_got_str_in_str), where.wt_index, typename1, typename2, where.wt_func_name); break; case WT_ARGUMENT: if (where.wt_func_name == NULL) semsg(_(e_argument_nr_type_mismatch_expected_str_but_got_str), where.wt_index, typename1, typename2); else semsg(_(e_argument_nr_type_mismatch_expected_str_but_got_str_in_str), where.wt_index, typename1, typename2, where.wt_func_name); break; case WT_UNKNOWN: if (where.wt_func_name == NULL) semsg(_(e_type_mismatch_expected_str_but_got_str), typename1, typename2); else semsg(_(e_type_mismatch_expected_str_but_got_str_in_str), typename1, typename2, where.wt_func_name); break; } vim_free(tofree1); vim_free(tofree2); } /* * Check if the expected and actual types match. * Does not allow for assigning "any" to a specific type. * When "argidx" > 0 it is included in the error message. * Return OK if types match. * Return FAIL if types do not match. */ int check_type( type_T *expected, type_T *actual, int give_msg, where_T where) { int ret = check_type_maybe(expected, actual, give_msg, where); return ret == MAYBE ? OK : ret; } /* * As check_type() but return MAYBE when a runtime type check should be used * when compiling. */ int check_type_maybe( type_T *expected, type_T *actual, int give_msg, where_T where) { int ret = OK; // When expected is "unknown" we accept any actual type. // When expected is "any" we accept any actual type except "void". if (expected->tt_type != VAR_UNKNOWN && !(expected->tt_type == VAR_ANY && actual->tt_type != VAR_VOID)) { // tt_type should match, except that a "partial" can be assigned to a // variable with type "func". // And "unknown" (using global variable) and "any" need a runtime type // check. if (!(expected->tt_type == actual->tt_type || actual->tt_type == VAR_UNKNOWN || actual->tt_type == VAR_ANY || (expected->tt_type == VAR_FUNC && actual->tt_type == VAR_PARTIAL))) { if (expected->tt_type == VAR_BOOL && (actual->tt_flags & TTFLAG_BOOL_OK)) // Using number 0 or 1 for bool is OK. return OK; if (expected->tt_type == VAR_FLOAT && actual->tt_type == VAR_NUMBER && ((expected->tt_flags & TTFLAG_NUMBER_OK) || (actual->tt_flags & TTFLAG_FLOAT_OK))) // Using a number where a float is expected is OK here. return OK; if (give_msg) type_mismatch_where(expected, actual, where); return FAIL; } if (expected->tt_type == VAR_DICT || expected->tt_type == VAR_LIST) { // "unknown" is used for an empty list or dict if (actual->tt_member != NULL && actual->tt_member != &t_unknown) ret = check_type_maybe(expected->tt_member, actual->tt_member, FALSE, where); } else if (expected->tt_type == VAR_FUNC && actual != &t_any) { // If the return type is unknown it can be anything, including // nothing, thus there is no point in checking. if (expected->tt_member != &t_unknown) { if (actual->tt_member != NULL && actual->tt_member != &t_unknown) ret = check_type_maybe(expected->tt_member, actual->tt_member, FALSE, where); else ret = MAYBE; } if (ret != FAIL && expected->tt_argcount != -1 && actual->tt_min_argcount != -1 && (actual->tt_argcount == -1 || (actual->tt_argcount < expected->tt_min_argcount || actual->tt_argcount > expected->tt_argcount))) ret = FAIL; if (ret != FAIL && expected->tt_args != NULL && actual->tt_args != NULL) { int i; for (i = 0; i < expected->tt_argcount && i < actual->tt_argcount; ++i) // Allow for using "any" argument type, lambda's have them. if (actual->tt_args[i] != &t_any && check_type( expected->tt_args[i], actual->tt_args[i], FALSE, where) == FAIL) { ret = FAIL; break; } } if (ret == OK && expected->tt_argcount >= 0 && actual->tt_argcount == -1) // check the argument count at runtime ret = MAYBE; } else if (expected->tt_type == VAR_OBJECT) { if (actual->tt_type == VAR_ANY) return MAYBE; // use runtime type check if (actual->tt_type != VAR_OBJECT) return FAIL; // don't use tt_class // check the class, base class or an implemented interface matches class_T *cl; for (cl = actual->tt_class; cl != NULL; cl = cl->class_extends) { if (expected->tt_class == cl) break; int i; for (i = cl->class_interface_count - 1; i >= 0; --i) if (expected->tt_class == cl->class_interfaces_cl[i]) break; if (i >= 0) break; } if (cl == NULL) ret = FAIL; } if (ret == FAIL && give_msg) type_mismatch_where(expected, actual, where); } if (ret == OK && expected->tt_type != VAR_UNKNOWN && expected->tt_type != VAR_ANY && (actual->tt_type == VAR_UNKNOWN || actual->tt_type == VAR_ANY)) // check the type at runtime ret = MAYBE; return ret; } /* * Check that the arguments of "type" match "argvars[argcount]". * "base_tv" is from "expr->Func()". * Return OK/FAIL. */ int check_argument_types( type_T *type, typval_T *argvars, int argcount, typval_T *base_tv, char_u *name) { int varargs = (type->tt_flags & TTFLAG_VARARGS) ? 1 : 0; int i; int totcount = argcount + (base_tv == NULL ? 0 : 1); if (type->tt_type != VAR_FUNC && type->tt_type != VAR_PARTIAL) return OK; // just in case if (totcount < type->tt_min_argcount - varargs) { emsg_funcname(e_not_enough_arguments_for_function_str, name); return FAIL; } if (!varargs && type->tt_argcount >= 0 && totcount > type->tt_argcount) { emsg_funcname(e_too_many_arguments_for_function_str, name); return FAIL; } if (type->tt_args == NULL) return OK; // cannot check for (i = 0; i < totcount; ++i) { type_T *expected; typval_T *tv; if (base_tv != NULL) { if (i == 0) tv = base_tv; else tv = &argvars[i - 1]; } else tv = &argvars[i]; if (varargs && i >= type->tt_argcount - 1) { expected = type->tt_args[type->tt_argcount - 1]; if (expected != NULL && expected->tt_type == VAR_LIST) expected = expected->tt_member; if (expected == NULL) expected = &t_any; } else expected = type->tt_args[i]; // check the type, unless the value is v:none if ((tv->v_type != VAR_SPECIAL || tv->vval.v_number != VVAL_NONE) && check_typval_arg_type(expected, tv, NULL, i + 1) == FAIL) return FAIL; } return OK; } /* * Skip over a type definition and return a pointer to just after it. * When "optional" is TRUE then a leading "?" is accepted. */ char_u * skip_type(char_u *start, int optional) { char_u *p = start; if (optional && *p == '?') ++p; // Also skip over "." for imported classes: "import.ClassName". while (ASCII_ISALNUM(*p) || *p == '_' || *p == '.') ++p; // Skip over "<type>"; this is permissive about white space. if (*skipwhite(p) == '<') { p = skipwhite(p); p = skip_type(skipwhite(p + 1), FALSE); p = skipwhite(p); if (*p == '>') ++p; } else if ((*p == '(' || (*p == ':' && VIM_ISWHITE(p[1]))) && STRNCMP("func", start, 4) == 0) { if (*p == '(') { // handle func(args): type ++p; while (*p != ')' && *p != NUL) { char_u *sp = p; if (STRNCMP(p, "...", 3) == 0) p += 3; p = skip_type(p, TRUE); if (p == sp) return p; // syntax error if (*p == ',') p = skipwhite(p + 1); } if (*p == ')') { if (p[1] == ':') p = skip_type(skipwhite(p + 2), FALSE); else ++p; } } else { // handle func: return_type p = skip_type(skipwhite(p + 1), FALSE); } } return p; } /* * Parse the member type: "<type>" and return "type" with the member set. * Use "type_gap" if a new type needs to be added. * "info" is extra information for an error message. * Returns NULL in case of failure. */ static type_T * parse_type_member( char_u **arg, type_T *type, garray_T *type_gap, int give_error, char *info) { char_u *arg_start = *arg; type_T *member_type; int prev_called_emsg = called_emsg; if (**arg != '<') { if (give_error) { if (*skipwhite(*arg) == '<') semsg(_(e_no_white_space_allowed_before_str_str), "<", *arg); else semsg(_(e_missing_type_after_str), info); } return NULL; } *arg = skipwhite(*arg + 1); member_type = parse_type(arg, type_gap, give_error); if (member_type == NULL) return NULL; *arg = skipwhite(*arg); if (**arg != '>' && called_emsg == prev_called_emsg) { if (give_error) semsg(_(e_missing_gt_after_type_str), arg_start); return NULL; } ++*arg; if (type->tt_type == VAR_LIST) return get_list_type(member_type, type_gap); return get_dict_type(member_type, type_gap); } /* * Parse a type at "arg" and advance over it. * When "give_error" is TRUE give error messages, otherwise be quiet. * Return NULL for failure. */ type_T * parse_type(char_u **arg, garray_T *type_gap, int give_error) { char_u *p = *arg; size_t len; // Skip over the first word. while (ASCII_ISALNUM(*p) || *p == '_') ++p; len = p - *arg; switch (**arg) { case 'a': if (len == 3 && STRNCMP(*arg, "any", len) == 0) { *arg += len; return &t_any; } break; case 'b': if (len == 4 && STRNCMP(*arg, "bool", len) == 0) { *arg += len; return &t_bool; } if (len == 4 && STRNCMP(*arg, "blob", len) == 0) { *arg += len; return &t_blob; } break; case 'c': if (len == 7 && STRNCMP(*arg, "channel", len) == 0) { *arg += len; return &t_channel; } break; case 'd': if (len == 4 && STRNCMP(*arg, "dict", len) == 0) { *arg += len; return parse_type_member(arg, &t_dict_any, type_gap, give_error, "dict"); } break; case 'f': if (len == 5 && STRNCMP(*arg, "float", len) == 0) { *arg += len; return &t_float; } if (len == 4 && STRNCMP(*arg, "func", len) == 0) { type_T *type; type_T *ret_type = &t_unknown; int argcount = -1; int flags = 0; int first_optional = -1; type_T *arg_type[MAX_FUNC_ARGS + 1]; // func({type}, ...{type}): {type} *arg += len; if (**arg == '(') { // "func" may or may not return a value, "func()" does // not return a value. ret_type = &t_void; p = ++*arg; argcount = 0; while (*p != NUL && *p != ')') { if (*p == '?') { if (first_optional == -1) first_optional = argcount; ++p; } else if (STRNCMP(p, "...", 3) == 0) { flags |= TTFLAG_VARARGS; p += 3; } else if (first_optional != -1) { if (give_error) emsg(_(e_mandatory_argument_after_optional_argument)); return NULL; } type = parse_type(&p, type_gap, give_error); if (type == NULL) return NULL; arg_type[argcount++] = type; // Nothing comes after "...{type}". if (flags & TTFLAG_VARARGS) break; if (*p != ',' && *skipwhite(p) == ',') { if (give_error) semsg(_(e_no_white_space_allowed_before_str_str), ",", p); return NULL; } if (*p == ',') { ++p; if (!VIM_ISWHITE(*p)) { if (give_error) semsg(_(e_white_space_required_after_str_str), ",", p - 1); return NULL; } } p = skipwhite(p); if (argcount == MAX_FUNC_ARGS) { if (give_error) emsg(_(e_too_many_argument_types)); return NULL; } } p = skipwhite(p); if (*p != ')') { if (give_error) emsg(_(e_missing_closing_paren)); return NULL; } *arg = p + 1; } if (**arg == ':') { // parse return type ++*arg; if (!VIM_ISWHITE(**arg) && give_error) semsg(_(e_white_space_required_after_str_str), ":", *arg - 1); *arg = skipwhite(*arg); ret_type = parse_type(arg, type_gap, give_error); if (ret_type == NULL) return NULL; } if (flags == 0 && first_optional == -1 && argcount <= 0) type = get_func_type(ret_type, argcount, type_gap); else { type = alloc_func_type(ret_type, argcount, type_gap); type->tt_flags = flags; if (argcount > 0) { type->tt_argcount = argcount; type->tt_min_argcount = first_optional == -1 ? argcount : first_optional; if (func_type_add_arg_types(type, argcount, type_gap) == FAIL) return NULL; mch_memmove(type->tt_args, arg_type, sizeof(type_T *) * argcount); } } return type; } break; case 'j': if (len == 3 && STRNCMP(*arg, "job", len) == 0) { *arg += len; return &t_job; } break; case 'l': if (len == 4 && STRNCMP(*arg, "list", len) == 0) { *arg += len; return parse_type_member(arg, &t_list_any, type_gap, give_error, "list"); } break; case 'n': if (len == 6 && STRNCMP(*arg, "number", len) == 0) { *arg += len; return &t_number; } break; case 's': if (len == 6 && STRNCMP(*arg, "string", len) == 0) { *arg += len; return &t_string; } break; case 'v': if (len == 4 && STRNCMP(*arg, "void", len) == 0) { *arg += len; return &t_void; } break; } // It can be a class or interface name, possibly imported. typval_T tv; tv.v_type = VAR_UNKNOWN; if (eval_variable_import(*arg, &tv) == OK) { if (tv.v_type == VAR_CLASS && tv.vval.v_class != NULL) { type_T *type = get_type_ptr(type_gap); if (type != NULL) { // Although the name is that of a class or interface, the type // uses will be an object. type->tt_type = VAR_OBJECT; type->tt_class = tv.vval.v_class; clear_tv(&tv); *arg += len; // Skip over ".ClassName". while (ASCII_ISALNUM(**arg) || **arg == '_' || **arg == '.') ++*arg; return type; } } clear_tv(&tv); } if (give_error) semsg(_(e_type_not_recognized_str), *arg); return NULL; } /* * Check if "type1" and "type2" are exactly the same. * "flags" can have ETYPE_ARG_UNKNOWN, which means that an unknown argument * type in "type1" is accepted. */ int equal_type(type_T *type1, type_T *type2, int flags) { int i; if (type1 == NULL || type2 == NULL) return FALSE; if (type1->tt_type != type2->tt_type) return FALSE; switch (type1->tt_type) { case VAR_UNKNOWN: case VAR_ANY: case VAR_VOID: case VAR_SPECIAL: case VAR_BOOL: case VAR_NUMBER: case VAR_FLOAT: case VAR_STRING: case VAR_BLOB: case VAR_JOB: case VAR_CHANNEL: case VAR_INSTR: case VAR_CLASS: case VAR_OBJECT: break; // not composite is always OK case VAR_LIST: case VAR_DICT: return equal_type(type1->tt_member, type2->tt_member, flags); case VAR_FUNC: case VAR_PARTIAL: if (!equal_type(type1->tt_member, type2->tt_member, flags) || type1->tt_argcount != type2->tt_argcount) return FALSE; if (type1->tt_argcount < 0 || type1->tt_args == NULL || type2->tt_args == NULL) return TRUE; for (i = 0; i < type1->tt_argcount; ++i) if ((flags & ETYPE_ARG_UNKNOWN) == 0 && !equal_type(type1->tt_args[i], type2->tt_args[i], flags)) return FALSE; return TRUE; } return TRUE; } /* * Find the common type of "type1" and "type2" and put it in "dest". * "type2" and "dest" may be the same. */ void common_type(type_T *type1, type_T *type2, type_T **dest, garray_T *type_gap) { if (equal_type(type1, type2, 0)) { *dest = type1; return; } // If either is VAR_UNKNOWN use the other type. An empty list/dict has no // specific type. if (type1 == NULL || type1->tt_type == VAR_UNKNOWN) { *dest = type2; return; } if (type2 == NULL || type2->tt_type == VAR_UNKNOWN) { *dest = type1; return; } if (type1->tt_type == type2->tt_type) { if (type1->tt_type == VAR_LIST || type2->tt_type == VAR_DICT) { type_T *common; common_type(type1->tt_member, type2->tt_member, &common, type_gap); if (type1->tt_type == VAR_LIST) *dest = get_list_type(common, type_gap); else *dest = get_dict_type(common, type_gap); return; } if (type1->tt_type == VAR_FUNC) { type_T *common; // When one of the types is t_func_unknown return the other one. // Useful if a list or dict item is null_func. if (type1 == &t_func_unknown) { *dest = type2; return; } if (type2 == &t_func_unknown) { *dest = type1; return; } common_type(type1->tt_member, type2->tt_member, &common, type_gap); if (type1->tt_argcount == type2->tt_argcount && type1->tt_argcount >= 0) { int argcount = type1->tt_argcount; int i; *dest = alloc_func_type(common, argcount, type_gap); if (type1->tt_args != NULL && type2->tt_args != NULL) { if (func_type_add_arg_types(*dest, argcount, type_gap) == OK) for (i = 0; i < argcount; ++i) common_type(type1->tt_args[i], type2->tt_args[i], &(*dest)->tt_args[i], type_gap); } } else // Use -1 for "tt_argcount" to indicate an unknown number of // arguments. *dest = alloc_func_type(common, -1, type_gap); // Use the minimum of min_argcount. (*dest)->tt_min_argcount = type1->tt_min_argcount < type2->tt_min_argcount ? type1->tt_min_argcount : type2->tt_min_argcount; return; } } *dest = &t_any; } /* * Push an entry onto the type stack. "type" used both for the current type * and the declared type. * Returns FAIL when out of memory. */ int push_type_stack(cctx_T *cctx, type_T *type) { return push_type_stack2(cctx, type, type); } /* * Push an entry onto the type stack. "type" is the current type, "decl_type" * is the declared type. * Returns FAIL when out of memory. */ int push_type_stack2(cctx_T *cctx, type_T *type, type_T *decl_type) { garray_T *stack = &cctx->ctx_type_stack; type2_T *typep; if (GA_GROW_FAILS(stack, 1)) return FAIL; typep = ((type2_T *)stack->ga_data) + stack->ga_len; typep->type_curr = type; typep->type_decl = decl_type; ++stack->ga_len; return OK; } /* * Set the type of the top of the stack to "type". */ void set_type_on_stack(cctx_T *cctx, type_T *type, int offset) { garray_T *stack = &cctx->ctx_type_stack; type2_T *typep = ((type2_T *)stack->ga_data) + stack->ga_len - 1 - offset; typep->type_curr = type; typep->type_decl = &t_any; } /* * Get the current type from the type stack. If "offset" is zero the one at * the top, * if "offset" is one the type above that, etc. * Returns &t_unknown if there is no such stack entry. */ type_T * get_type_on_stack(cctx_T *cctx, int offset) { garray_T *stack = &cctx->ctx_type_stack; if (offset + 1 > stack->ga_len) return &t_unknown; return (((type2_T *)stack->ga_data) + stack->ga_len - offset - 1) ->type_curr; } /* * Get the declared type from the type stack. If "offset" is zero the one at * the top, * if "offset" is one the type above that, etc. * Returns &t_unknown if there is no such stack entry. */ type_T * get_decl_type_on_stack(cctx_T *cctx, int offset) { garray_T *stack = &cctx->ctx_type_stack; if (offset + 1 > stack->ga_len) return &t_unknown; return (((type2_T *)stack->ga_data) + stack->ga_len - offset - 1) ->type_decl; } /* * Get the member type of a dict or list from the items on the stack of "cctx". * The declared type is stored in "decl_type". * For a list "skip" is 1, for a dict "skip" is 2, keys are skipped. * Returns &t_void for an empty list or dict. * Otherwise finds the common type of all items. */ type_T * get_member_type_from_stack( int count, int skip, cctx_T *cctx) { garray_T *stack = &cctx->ctx_type_stack; type2_T *typep; garray_T *type_gap = cctx->ctx_type_list; int i; type_T *result; type_T *type; // Use "unknown" for an empty list or dict. if (count == 0) return &t_unknown; // Use the first value type for the list member type, then find the common // type from following items. typep = ((type2_T *)stack->ga_data) + stack->ga_len; result = (typep -(count * skip) + skip - 1)->type_curr; for (i = 1; i < count; ++i) { if (result == &t_any) break; // won't get more common type = (typep -((count - i) * skip) + skip - 1)->type_curr; common_type(type, result, &result, type_gap); } return result; } char * vartype_name(vartype_T type) { switch (type) { case VAR_UNKNOWN: break; case VAR_ANY: return "any"; case VAR_VOID: return "void"; case VAR_SPECIAL: return "special"; case VAR_BOOL: return "bool"; case VAR_NUMBER: return "number"; case VAR_FLOAT: return "float"; case VAR_STRING: return "string"; case VAR_BLOB: return "blob"; case VAR_JOB: return "job"; case VAR_CHANNEL: return "channel"; case VAR_LIST: return "list"; case VAR_DICT: return "dict"; case VAR_INSTR: return "instr"; case VAR_CLASS: return "class"; case VAR_OBJECT: return "object"; case VAR_FUNC: case VAR_PARTIAL: return "func"; } return "unknown"; } /* * Return the name of a type. * The result may be in allocated memory, in which case "tofree" is set. */ char * type_name(type_T *type, char **tofree) { char *name; char *arg_free = NULL; *tofree = NULL; if (type == NULL) return "[unknown]"; name = vartype_name(type->tt_type); if (type->tt_type == VAR_LIST || type->tt_type == VAR_DICT) { char *member_free; char *member_name = type_name(type->tt_member, &member_free); size_t len = STRLEN(name) + STRLEN(member_name) + 3; *tofree = alloc(len); if (*tofree != NULL) { vim_snprintf(*tofree, len, "%s<%s>", name, member_name); vim_free(member_free); return *tofree; } } if (type->tt_type == VAR_OBJECT || type->tt_type == VAR_CLASS) { char_u *class_name = type->tt_class == NULL ? (char_u *)"Unknown" : type->tt_class->class_name; size_t len = STRLEN(name) + STRLEN(class_name) + 3; *tofree = alloc(len); if (*tofree != NULL) { vim_snprintf(*tofree, len, "%s<%s>", name, class_name); return *tofree; } } if (type->tt_type == VAR_FUNC) { garray_T ga; int i; int varargs = (type->tt_flags & TTFLAG_VARARGS) ? 1 : 0; ga_init2(&ga, 1, 100); if (ga_grow(&ga, 20) == FAIL) goto failed; STRCPY(ga.ga_data, "func("); ga.ga_len += 5; for (i = 0; i < type->tt_argcount; ++i) { char *arg_type; int len; if (type->tt_args == NULL) arg_type = "[unknown]"; else arg_type = type_name(type->tt_args[i], &arg_free); if (i > 0) { STRCPY((char *)ga.ga_data + ga.ga_len, ", "); ga.ga_len += 2; } len = (int)STRLEN(arg_type); if (ga_grow(&ga, len + 8) == FAIL) goto failed; if (varargs && i == type->tt_argcount - 1) ga_concat(&ga, (char_u *)"..."); else if (i >= type->tt_min_argcount) *((char *)ga.ga_data + ga.ga_len++) = '?'; ga_concat(&ga, (char_u *)arg_type); VIM_CLEAR(arg_free); } if (type->tt_argcount < 0) // any number of arguments ga_concat(&ga, (char_u *)"..."); if (type->tt_member == &t_void) STRCPY((char *)ga.ga_data + ga.ga_len, ")"); else { char *ret_free; char *ret_name = type_name(type->tt_member, &ret_free); int len; len = (int)STRLEN(ret_name) + 4; if (ga_grow(&ga, len) == FAIL) goto failed; STRCPY((char *)ga.ga_data + ga.ga_len, "): "); STRCPY((char *)ga.ga_data + ga.ga_len + 3, ret_name); vim_free(ret_free); } *tofree = ga.ga_data; return ga.ga_data; failed: vim_free(arg_free); ga_clear(&ga); return "[unknown]"; } return name; } /* * "typename(expr)" function */ void f_typename(typval_T *argvars, typval_T *rettv) { garray_T type_list; type_T *type; char *tofree; char *name; rettv->v_type = VAR_STRING; ga_init2(&type_list, sizeof(type_T *), 10); type = typval2type(argvars, get_copyID(), &type_list, TVTT_DO_MEMBER); name = type_name(type, &tofree); if (tofree != NULL) rettv->vval.v_string = (char_u *)tofree; else rettv->vval.v_string = vim_strsave((char_u *)name); clear_type_list(&type_list); } #endif // FEAT_EVAL