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cancel detects if the target handle has already returned

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This commit is contained in:
Andrew Kelley 2018-07-28 01:22:51 -04:00
parent f0c049d02b
commit 6fed777637
1 changed files with 15 additions and 0 deletions
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15
src/ir.cpp
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@ -6672,6 +6672,8 @@ static IrInstruction *ir_gen_cancel(IrBuilder *irb, Scope *scope, AstNode *node)
IrBasicBlock *done_block = ir_create_basic_block(irb, scope, "CancelDone");
IrBasicBlock *not_canceled_block = ir_create_basic_block(irb, scope, "NotCanceled");
IrBasicBlock *post_return_block = ir_create_basic_block(irb, scope, "PostReturn");
IrBasicBlock *do_cancel_block = ir_create_basic_block(irb, scope, "DoCancel");
IrInstruction *zero = ir_build_const_usize(irb, scope, node, 0);
IrInstruction *usize_type_val = ir_build_const_type(irb, scope, node, irb->codegen->builtin_types.entry_usize);
@ -6679,6 +6681,9 @@ static IrInstruction *ir_gen_cancel(IrBuilder *irb, Scope *scope, AstNode *node)
IrInstruction *is_canceled_mask = ir_build_const_usize(irb, scope, node, 0x1); // 0b001
IrInstruction *promise_T_type_val = ir_build_const_type(irb, scope, node,
get_promise_type(irb->codegen, irb->codegen->builtin_types.entry_void));
IrInstruction *inverted_ptr_mask = ir_build_const_usize(irb, scope, node, 0x7); // 0b111
IrInstruction *ptr_mask = ir_build_un_op(irb, scope, node, IrUnOpBinNot, inverted_ptr_mask); // 0b111...000
IrInstruction *await_mask = ir_build_const_usize(irb, scope, node, 0x4); // 0b100
// TODO relies on Zig not re-ordering fields
IrInstruction *casted_target_inst = ir_build_ptr_cast(irb, scope, node, promise_T_type_val, target_inst);
@ -6697,6 +6702,16 @@ static IrInstruction *ir_gen_cancel(IrBuilder *irb, Scope *scope, AstNode *node)
ir_build_cond_br(irb, scope, node, is_canceled_bool, done_block, not_canceled_block, is_comptime);
ir_set_cursor_at_end_and_append_block(irb, not_canceled_block);
IrInstruction *awaiter_addr = ir_build_bin_op(irb, scope, node, IrBinOpBinAnd, prev_atomic_value, ptr_mask, false);
IrInstruction *is_returned_bool = ir_build_bin_op(irb, scope, node, IrBinOpCmpEq, awaiter_addr, ptr_mask, false);
ir_build_cond_br(irb, scope, node, is_returned_bool, post_return_block, do_cancel_block, is_comptime);
ir_set_cursor_at_end_and_append_block(irb, post_return_block);
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, done_block, do_cancel_block, is_comptime);
ir_set_cursor_at_end_and_append_block(irb, do_cancel_block);
ir_build_cancel(irb, scope, node, target_inst);
ir_build_br(irb, scope, node, done_block, is_comptime);