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Fix No index OOB check for [:^n] #2123

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This commit is contained in:
Christoffer Lerno
2025-05-06 16:53:14 +02:00
parent 125436d23e
commit 3f07d1c7b8
3 changed files with 192 additions and 2 deletions
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7
src/compiler/llvm_codegen_expr.c
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@@ -2704,11 +2704,15 @@ static void llvm_emit_slice_values(GenContext *c, Expr *slice, BEValue *parent_r
// This will trap any bad negative index, so we're fine.
if (safe_mode_enabled())
{
BEValue excess;
if (is_len_range)
{
llvm_emit_int_comp(c, &excess, &start_index, &end_index, BINARYOP_GT);
BEValue actual_end_len = end_index;
actual_end_len.value = llvm_emit_sub_int(c, end_index.type, end_index.value, start_index.value, slice->span);
llvm_emit_panic_if_true(c, &excess, "Negative slice length", slice->span, "Negative value (%d) given for slice length.", &actual_end_len, NULL);
if (len.value)
{
BEValue excess;
llvm_emit_int_comp(c, &excess, &len, &end_index, BINARYOP_LT);
BEValue actual_end_index = end_index;
actual_end_index.value = llvm_emit_sub_int(c, end_index.type, end_index.value, llvm_const_int(c, type_isz, 1), slice->span);
@@ -2717,7 +2721,6 @@ static void llvm_emit_slice_values(GenContext *c, Expr *slice, BEValue *parent_r
}
else
{
BEValue excess;
llvm_emit_int_comp(c, &excess, &start_index, &end_index, BINARYOP_GT);
llvm_emit_panic_if_true(c, &excess, "Negative size", slice->span, "Negative size (start %d is less than end %d)", &start_index, &end_index);