3cc34d54c1
lowerBreak/lowerContinue emitted a bare br, and the enclosing block's emitBlockDefers — seeing the terminator — discarded the pending entries on the assumption a return had already drained them. The breaking iteration's defers were silently skipped, leaking whatever the cleanup released. Lowering.loop_defer_base records the defer-stack height at each loop's body start (while / for / range-for, saved and restored alongside break_target); break/continue drain non-onfail entries down to it in LIFO order via the non-truncating emitLoopExitDefers before branching. Truncation stays with the lexical block exits — the same entries still belong to the fall-through path after the branch containing the break. break/continue outside a loop now diagnose instead of no-op'ing. Regression: examples/0049-basic-defer-break-continue.sx (for and while, break and continue, nested-block LIFO drain).
47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
// `defer` runs on EVERY exit from the loop body's scope — fall-through,
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// `break`, and `continue` alike (LIFO, including entries from nested blocks
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// between the loop and the jump). Covers `for` ranges and `while`.
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// Regression (issue 0108): break/continue emitted a bare branch and the
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// breaking iteration's defers were silently skipped.
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#import "modules/std.sx";
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main :: () -> s32 {
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for 0..3: (i) {
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defer print("cleanup {}\n", i);
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if i == 1 { break; }
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print("body {}\n", i);
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}
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print("after break loop\n");
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for 0..3: (i) {
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defer print("c2 {}\n", i);
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if i == 1 { continue; }
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print("b2 {}\n", i);
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}
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print("done\n");
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i := 0;
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while i < 3 {
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defer print("w{}\n", i);
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i += 1;
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if i == 2 { continue; }
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if i == 3 { break; }
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print("wbody{}\n", i);
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}
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print("while done\n");
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// A break inside a nested block drains the nested block's defers AND the
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// loop body's, in LIFO order.
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for 0..2: (j) {
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defer print("outer {}\n", j);
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{
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defer print("inner {}\n", j);
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if j == 0 { break; }
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}
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print("unreached\n");
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}
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print("nested done\n");
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0
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}
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