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detect double await

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This commit is contained in:
Andrew Kelley 2018-07-27 18:37:30 -04:00
parent e5beca886d
commit f0c049d02b
1 changed files with 12 additions and 0 deletions
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12
src/ir.cpp
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@ -6796,6 +6796,9 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *scope, AstNode *n
ir_build_store_ptr(irb, scope, node, err_ret_trace_ptr_field_ptr, err_ret_trace_ptr);
}
IrBasicBlock *already_awaited_block = ir_create_basic_block(irb, scope, "AlreadyAwaited");
IrBasicBlock *not_awaited_block = ir_create_basic_block(irb, scope, "NotAwaited");
Buf *atomic_state_field_name = buf_create_from_str(ATOMIC_STATE_FIELD_NAME);
IrInstruction *atomic_state_ptr = ir_build_field_ptr(irb, scope, node, coro_promise_ptr,
atomic_state_field_name);
@ -6823,6 +6826,15 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *scope, AstNode *n
IrInstruction *prev_atomic_value = ir_build_atomic_rmw(irb, scope, node,
usize_type_val, atomic_state_ptr, nullptr, mask_bits, nullptr,
AtomicRmwOp_or, AtomicOrderSeqCst);
IrInstruction *is_awaited_value = ir_build_bin_op(irb, scope, node, IrBinOpBinAnd, prev_atomic_value, await_mask, false);
IrInstruction *is_awaited_bool = ir_build_bin_op(irb, scope, node, IrBinOpCmpNotEq, is_awaited_value, zero, false);
ir_build_cond_br(irb, scope, node, is_awaited_bool, already_awaited_block, not_awaited_block, const_bool_false);
ir_set_cursor_at_end_and_append_block(irb, already_awaited_block);
ir_build_unreachable(irb, scope, node);
ir_set_cursor_at_end_and_append_block(irb, not_awaited_block);
IrInstruction *await_handle_addr = ir_build_bin_op(irb, scope, node, IrBinOpBinAnd, prev_atomic_value, ptr_mask, false);
IrInstruction *is_non_null = ir_build_bin_op(irb, scope, node, IrBinOpCmpNotEq, await_handle_addr, zero, false);
IrBasicBlock *yes_suspend_block = ir_create_basic_block(irb, scope, "YesSuspend");