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, 8 insertions, 0 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 6f240b88f5..1f8473ac32 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -4590,6 +4590,7 @@ pub const FuncGen = struct {
                 .block          => try self.airBlock(inst),
                 .br             => try self.airBr(inst),
                 .switch_br      => try self.airSwitchBr(inst),
+                .trap           => try self.airTrap(inst),
                 .breakpoint     => try self.airBreakpoint(inst),
                 .ret_addr       => try self.airRetAddr(inst),
                 .frame_addr     => try self.airFrameAddress(inst),
@@ -8256,6 +8257,13 @@ pub const FuncGen = struct {
         return fg.load(ptr, ptr_ty);
     }
 
+    fn airTrap(self: *FuncGen, inst: Air.Inst.Index) !?*llvm.Value {
+        _ = inst;
+        const llvm_fn = self.getIntrinsic("llvm.trap", &.{});
+        _ = self.builder.buildCall(llvm_fn.globalGetValueType(), llvm_fn, undefined, 0, .Cold, .Auto, "");
+        return null;
+    }
+
     fn airBreakpoint(self: *FuncGen, inst: Air.Inst.Index) !?*llvm.Value {
         _ = inst;
         const llvm_fn = self.getIntrinsic("llvm.debugtrap", &.{});