authorgravatar for iridescentrosesfall@gmail.comNathan Bourgeois <iridescentrosesfall@gmail.com> 2026-03-21 21:32:22-04:00
committergravatar for iridescentrosesfall@gmail.comNathan Bourgeois <iridescentrosesfall@gmail.com> 2026-03-21 21:32:22-04:00
log164d01c1dc258068c23016ec2110e2b6080b8a2d
tree05f38cfc42726c1d357c1c2a16f085cd0282b178
parentc824ce954ee81d438613ea7cf1e9a8111f730732

codegen: notraps on mips causes break and infinite loop on `@trap()`

1 files changed, 19 insertions(+), 1 deletions(-)

src/codegen/llvm.zig+19-1
...@@ -9537,7 +9537,25 @@ pub const FuncGen = struct {...@@ -9537,7 +9537,25 @@ pub const FuncGen = struct {
95379537
9538 fn airTrap(self: *FuncGen, inst: Air.Inst.Index) !void {9538 fn airTrap(self: *FuncGen, inst: Air.Inst.Index) !void {
9539 _ = inst;9539 _ = inst;
9540 _ = try self.wip.callIntrinsic(.normal, .none, .trap, &.{}, &.{}, "");9540 const target = self.ng.object.target;
9541 if ((target.cpu.arch == .mips or target.cpu.arch == .mipsel) and
9542 target.cpu.has(.mips, .notraps))
9543 {
9544 // Emit a MIPS `break` instruction followed by an infinite loop (to fulfill the noreturn)
9545 // since this CPU does not support trap instructions.
9546 const o = self.ng.object;
9547 _ = try self.wip.callAsm(
9548 .none,
9549 try o.builder.fnType(.void, &.{}, .normal),
9550 .{ .sideeffect = true },
9551 try o.builder.string("break\n0:\nj 0b\nnop"),
9552 try o.builder.string("~{memory}"),
9553 &.{},
9554 "",
9555 );
9556 } else {
9557 _ = try self.wip.callIntrinsic(.normal, .none, .trap, &.{}, &.{}, "");
9558 }
9541 _ = try self.wip.@"unreachable"();9559 _ = try self.wip.@"unreachable"();
9542 }9560 }
95439561