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patch 8.2.2590: Vim9: default argument value may cause internal error

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Problem:    Vim9: default argument value may cause internal error.
Solution:   Hide later function arguments when compiling the expression.
            (closes #7948)
This commit is contained in:
Bram Moolenaar
2021-03-11 20:04:04 +01:00
parent 776b954622
commit 12bce95887
3 changed files with 20 additions and 1 deletions
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11
src/vim9compile.c
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@@ -8199,6 +8199,7 @@ compile_def_function(
{
int count = ufunc->uf_def_args.ga_len;
int first_def_arg = ufunc->uf_args.ga_len - count;
int uf_args_len = ufunc->uf_args.ga_len;
int i;
char_u *arg;
int off = STACK_FRAME_SIZE + (ufunc->uf_va_name != NULL ? 1 : 0);
@@ -8211,16 +8212,24 @@ compile_def_function(
ufunc->uf_def_arg_idx = ALLOC_CLEAR_MULT(int, count + 1);
if (ufunc->uf_def_arg_idx == NULL)
goto erret;
SOURCING_LNUM = 0; // line number unknown
for (i = 0; i < count; ++i)
{
garray_T *stack = &cctx.ctx_type_stack;
type_T *val_type;
int arg_idx = first_def_arg + i;
where_T where;
int r;
// Make sure later arguments are not found.
ufunc->uf_args.ga_len = i;
ufunc->uf_def_arg_idx[i] = instr->ga_len;
arg = ((char_u **)(ufunc->uf_def_args.ga_data))[i];
if (compile_expr0(&arg, &cctx) == FAIL)
r = compile_expr0(&arg, &cctx);
ufunc->uf_args.ga_len = uf_args_len;
if (r == FAIL)
goto erret;
// If no type specified use the type of the default value.