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patch 8.2.2722: Vim9: crash when using LHS with double index

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Problem:    Vim9: crash when using LHS with double index.
Solution:   Handle lhs_dest which is "dest_expr". (closes #8068)
            Fix confusing error message for missing dict item.
This commit is contained in:
Bram Moolenaar
2021-04-05 20:51:00 +02:00
parent 2927c07b0e
commit b9c0cd897a
4 changed files with 61 additions and 31 deletions
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75
src/vim9compile.c
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@@ -6093,6 +6093,48 @@ compile_assign_index(
return r;
}
/*
* For a LHS with an index, load the variable to be indexed.
*/
static int
compile_load_lhs(
lhs_T *lhs,
char_u *var_start,
type_T *rhs_type,
cctx_T *cctx)
{
if (lhs->lhs_dest == dest_expr)
{
size_t varlen = lhs->lhs_varlen;
int c = var_start[varlen];
char_u *p = var_start;
garray_T *stack = &cctx->ctx_type_stack;
// Evaluate "ll[expr]" of "ll[expr][idx]"
var_start[varlen] = NUL;
if (compile_expr0(&p, cctx) == OK && p != var_start + varlen)
{
// this should not happen
emsg(_(e_missbrac));
return FAIL;
}
var_start[varlen] = c;
lhs->lhs_type = stack->ga_len == 0 ? &t_void
: ((type_T **)stack->ga_data)[stack->ga_len - 1];
// now we can properly check the type
if (rhs_type != NULL && lhs->lhs_type->tt_member != NULL
&& rhs_type != &t_void
&& need_type(rhs_type, lhs->lhs_type->tt_member, -2, 0, cctx,
FALSE, FALSE) == FAIL)
return FAIL;
}
else
generate_loadvar(cctx, lhs->lhs_dest, lhs->lhs_name,
lhs->lhs_lvar, lhs->lhs_type);
return OK;
}
/*
* Assignment to a list or dict member, or ":unlet" for the item, using the
* information in "lhs".
@@ -6106,9 +6148,7 @@ compile_assign_unlet(
type_T *rhs_type,
cctx_T *cctx)
{
char_u *p;
vartype_T dest_type;
size_t varlen = lhs->lhs_varlen;
garray_T *stack = &cctx->ctx_type_stack;
int range = FALSE;
@@ -6147,32 +6187,8 @@ compile_assign_unlet(
// - index
// - for [a : b] second index
// - variable
if (lhs->lhs_dest == dest_expr)
{
int c = var_start[varlen];
// Evaluate "ll[expr]" of "ll[expr][idx]"
p = var_start;
var_start[varlen] = NUL;
if (compile_expr0(&p, cctx) == OK && p != var_start + varlen)
{
// this should not happen
emsg(_(e_missbrac));
return FAIL;
}
var_start[varlen] = c;
lhs->lhs_type = stack->ga_len == 0 ? &t_void
: ((type_T **)stack->ga_data)[stack->ga_len - 1];
// now we can properly check the type
if (lhs->lhs_type->tt_member != NULL && rhs_type != &t_void
&& need_type(rhs_type, lhs->lhs_type->tt_member, -2, 0, cctx,
FALSE, FALSE) == FAIL)
return FAIL;
}
else
generate_loadvar(cctx, lhs->lhs_dest, lhs->lhs_name,
lhs->lhs_lvar, lhs->lhs_type);
if (compile_load_lhs(lhs, var_start, rhs_type, cctx) == FAIL)
return FAIL;
if (dest_type == VAR_LIST || dest_type == VAR_DICT || dest_type == VAR_ANY)
{
@@ -6384,8 +6400,7 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
// for "+=", "*=", "..=" etc. first load the current value
if (*op != '=')
{
generate_loadvar(cctx, lhs.lhs_dest, lhs.lhs_name,
lhs.lhs_lvar, lhs.lhs_type);
compile_load_lhs(&lhs, var_start, NULL, cctx);
if (lhs.lhs_has_index)
{