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Error if a stack allocated variable is too big (configurable with --max-stack-object-size).

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This commit is contained in:
Christoffer Lerno
2025-08-21 00:33:56 +02:00
parent b7c9a4e2e9
commit a2ef63f5b6
12 changed files with 54 additions and 26 deletions
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10
src/compiler/sema_decls.c
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@@ -4789,6 +4789,16 @@ bool sema_analyse_var_decl(SemaContext *context, Decl *decl, bool local)
{
if (!sema_set_alloca_alignment(context, decl->type, &decl->alignment)) return false;
}
if (decl->var.kind == VARDECL_LOCAL && type_size(decl->type) > compiler.build.max_stack_object_size * 1024)
{
size_t size = type_size(decl->type);
RETURN_SEMA_ERROR(
decl, "The size of this local variable (%s%d Kb) exceeds the maximum allowed stack object size (%d Kb), "
"you can increase this limit with --max-stack-object-size, but be aware that too large objects "
"allocated on the stack may lead to the stack running out of memory.", size % 1024 == 0 ? "" : "over ",
size / 1024,
compiler.build.max_stack_object_size);
}
return success;
}