add @trap builtin

This introduces a new builtin function that compiles down to something that results in an illegal instruction exception/interrupt.
It can be used to exit a program abnormally.

This implements the builtin for all backends.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/Sema.zig b/src/Sema.zig
index 4702d10688..8940527bc0 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -1101,6 +1101,7 @@ fn analyzeBodyInner(
             .@"unreachable" => break sema.zirUnreachable(block, inst),
             .panic          => break sema.zirPanic(block, inst, false),
             .panic_comptime => break sema.zirPanic(block, inst, true),
+            .trap           => break sema.zirTrap(block, inst),
             // zig fmt: on
 
             .extended => ext: {
@@ -5144,6 +5145,14 @@ fn zirPanic(sema: *Sema, block: *Block, inst: Zir.Inst.Index, force_comptime: bo
     return always_noreturn;
 }
 
+fn zirTrap(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Zir.Inst.Index {
+    const src_node = sema.code.instructions.items(.data)[inst].node;
+    const src = LazySrcLoc.nodeOffset(src_node);
+    sema.src = src;
+    _ = try block.addNoOp(.trap);
+    return always_noreturn;
+}
+
 fn zirLoop(sema: *Sema, parent_block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
     const tracy = trace(@src());
     defer tracy.end();