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nac3core/codegen: prevent users from modifying loop counter

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Fixes #211
This commit is contained in:
pca006132 2022-03-26 20:58:37 +08:00
parent bf067e2481
commit 1a82d296e7
2 changed files with 12 additions and 1 deletions
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4
nac3core/src/codegen/stmt.rs
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@ -189,7 +189,8 @@ pub fn gen_for<'ctx, 'a, G: CodeGenerator>(
if ctx.unifier.unioned(iter.custom.unwrap(), ctx.primitives.range) {
// setup
let iter_val = iter_val.into_pointer_value();
let i = generator.gen_store_target(ctx, target)?;
let i = generator.gen_var_alloc(ctx, int32.into())?;
let user_i = generator.gen_store_target(ctx, target)?;
let (start, end, step) = destructure_range(ctx, iter_val);
ctx.builder.build_store(i, ctx.builder.build_int_sub(start, step, "start_init"));
ctx.builder.build_unconditional_branch(test_bb);
@ -207,6 +208,7 @@ pub fn gen_for<'ctx, 'a, G: CodeGenerator>(
"start_loop",
);
ctx.builder.build_store(i, tmp);
ctx.builder.build_store(user_i, tmp);
// // if step > 0, continue when i < end
let cmp1 = ctx.builder.build_int_compare(inkwell::IntPredicate::SLT, tmp, end, "cmp1");
// if step < 0, continue when i > end

9
nac3standalone/demo/src/loop.py Normal file
View File

@ -0,0 +1,9 @@
@extern
def output_int32(x: int32):
...
def run() -> int32:
for _ in range(10):
output_int32(_)
_ = 0