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patch 8.2.1667: local function name cannot shadow a global function name

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Problem:    Local function name cannot shadow a global function name.
Solution:   Ignore global functions when checking a script-local or scoped
            function name. (closes #6926)
This commit is contained in:
Bram Moolenaar
2020-09-12 18:32:34 +02:00
parent b00ef0508b
commit 0f769815c8
5 changed files with 82 additions and 19 deletions
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57
src/vim9compile.c
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@@ -292,12 +292,14 @@ lookup_script(char_u *name, size_t len, int vim9script)
/*
* Check if "p[len]" is already defined, either in script "import_sid" or in
* compilation context "cctx".
* Does not check the global namespace.
* Return FAIL and give an error if it defined.
*/
int
check_defined(char_u *p, size_t len, cctx_T *cctx)
{
int c = p[len];
int c = p[len];
ufunc_T *ufunc = NULL;
p[len] = NUL;
if (lookup_script(p, len, FALSE) == OK
@@ -305,11 +307,16 @@ check_defined(char_u *p, size_t len, cctx_T *cctx)
&& (lookup_local(p, len, cctx) != NULL
|| lookup_arg(p, len, NULL, NULL, NULL, cctx) == OK))
|| find_imported(p, len, cctx) != NULL
|| find_func_even_dead(p, FALSE, cctx) != NULL)
|| (ufunc = find_func_even_dead(p, FALSE, cctx)) != NULL)
{
p[len] = c;
semsg(_(e_name_already_defined_str), p);
return FAIL;
// A local or script-local function can shadow a global function.
if (ufunc == NULL || !func_is_global(ufunc)
|| (p[0] == 'g' && p[1] == ':'))
{
p[len] = c;
semsg(_(e_name_already_defined_str), p);
return FAIL;
}
}
p[len] = c;
return OK;
@@ -2114,10 +2121,16 @@ generate_funcref(cctx_T *cctx, char_u *name)
/*
* Compile a variable name into a load instruction.
* "end" points to just after the name.
* "is_expr" is TRUE when evaluating an expression, might be a funcref.
* When "error" is FALSE do not give an error when not found.
*/
static int
compile_load(char_u **arg, char_u *end_arg, cctx_T *cctx, int error)
compile_load(
char_u **arg,
char_u *end_arg,
cctx_T *cctx,
int is_expr,
int error)
{
type_T *type;
char_u *name = NULL;
@@ -2214,10 +2227,11 @@ compile_load(char_u **arg, char_u *end_arg, cctx_T *cctx, int error)
|| find_imported(name, 0, cctx) != NULL)
res = compile_load_scriptvar(cctx, name, *arg, &end, FALSE);
// When the name starts with an uppercase letter or "x:" it
// can be a user defined function.
// When evaluating an expression and the name starts with an
// uppercase letter or "x:" it can be a user defined function.
// TODO: this is just guessing
if (res == FAIL && (ASCII_ISUPPER(*name) || name[1] == ':'))
if (res == FAIL && is_expr
&& (ASCII_ISUPPER(*name) || name[1] == ':'))
res = generate_funcref(cctx, name);
}
}
@@ -2368,8 +2382,9 @@ compile_call(
}
// If we can find the function by name generate the right call.
// Skip global functions here, a local funcref takes precedence.
ufunc = find_func(name, FALSE, cctx);
if (ufunc != NULL)
if (ufunc != NULL && !func_is_global(ufunc))
{
res = generate_CALL(cctx, ufunc, argcount);
goto theend;
@@ -2380,7 +2395,7 @@ compile_call(
// Not for eome#Func(), it will be loaded later.
p = namebuf;
if (STRNCMP(namebuf, "g:", 2) != 0 && !is_autoload
&& compile_load(&p, namebuf + varlen, cctx, FALSE) == OK)
&& compile_load(&p, namebuf + varlen, cctx, FALSE, FALSE) == OK)
{
garray_T *stack = &cctx->ctx_type_stack;
type_T *type;
@@ -2390,6 +2405,13 @@ compile_call(
goto theend;
}
// If we can find a global function by name generate the right call.
if (ufunc != NULL)
{
res = generate_CALL(cctx, ufunc, argcount);
goto theend;
}
// A global function may be defined only later. Need to figure out at
// runtime. Also handles a FuncRef at runtime.
if (STRNCMP(namebuf, "g:", 2) == 0 || is_autoload)
@@ -3548,7 +3570,7 @@ compile_expr7(
{
if (generate_ppconst(cctx, ppconst) == FAIL)
return FAIL;
r = compile_load(arg, p, cctx, TRUE);
r = compile_load(arg, p, cctx, TRUE, TRUE);
}
if (r == FAIL)
return FAIL;
@@ -5002,6 +5024,11 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
: ((type_T **)stack->ga_data)[stack->ga_len - 1];
if (lvar != NULL && (is_decl || !has_type))
{
if ((stacktype->tt_type == VAR_FUNC
|| stacktype->tt_type == VAR_PARTIAL)
&& var_wrong_func_name(name, TRUE))
goto theend;
if (new_local && !has_type)
{
if (stacktype->tt_type == VAR_VOID)
@@ -5009,12 +5036,6 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
emsg(_(e_cannot_use_void_value));
goto theend;
}
else if ((stacktype->tt_type == VAR_FUNC
|| stacktype->tt_type == VAR_PARTIAL)
&& var_wrong_func_name(name, TRUE))
{
goto theend;
}
else
{
// An empty list or dict has a &t_void member,