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await checks the cancel bit

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This commit is contained in:
Andrew Kelley 2018-07-28 12:23:47 -04:00
parent 60cda3713f
commit 0ba2bc38d7
1 changed files with 12 additions and 5 deletions
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17
src/ir.cpp
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@ -6824,6 +6824,12 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *scope, AstNode *n
IrBasicBlock *already_awaited_block = ir_create_basic_block(irb, scope, "AlreadyAwaited");
IrBasicBlock *not_awaited_block = ir_create_basic_block(irb, scope, "NotAwaited");
IrBasicBlock *not_canceled_block = ir_create_basic_block(irb, scope, "NotCanceled");
IrBasicBlock *yes_suspend_block = ir_create_basic_block(irb, scope, "YesSuspend");
IrBasicBlock *no_suspend_block = ir_create_basic_block(irb, scope, "NoSuspend");
IrBasicBlock *merge_block = ir_create_basic_block(irb, scope, "MergeSuspend");
IrBasicBlock *cleanup_block = ir_create_basic_block(irb, scope, "SuspendCleanup");
IrBasicBlock *resume_block = ir_create_basic_block(irb, scope, "SuspendResume");
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,
@ -6836,6 +6842,7 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *scope, AstNode *n
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
IrInstruction *is_canceled_mask = ir_build_const_usize(irb, scope, node, 0x1); // 0b001
VariableTableEntry *result_var = ir_create_var(irb, node, scope, nullptr,
false, false, true, const_bool_false);
@ -6861,11 +6868,13 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *scope, AstNode *n
ir_build_unreachable(irb, scope, node);
ir_set_cursor_at_end_and_append_block(irb, not_awaited_block);
IrInstruction *is_canceled_value = ir_build_bin_op(irb, scope, node, IrBinOpBinAnd, prev_atomic_value, is_canceled_mask, false);
IrInstruction *is_canceled_bool = ir_build_bin_op(irb, scope, node, IrBinOpCmpNotEq, is_canceled_value, zero, false);
ir_build_cond_br(irb, scope, node, is_canceled_bool, cleanup_block, not_canceled_block, const_bool_false);
ir_set_cursor_at_end_and_append_block(irb, not_canceled_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");
IrBasicBlock *no_suspend_block = ir_create_basic_block(irb, scope, "NoSuspend");
IrBasicBlock *merge_block = ir_create_basic_block(irb, scope, "MergeSuspend");
ir_build_cond_br(irb, scope, node, is_non_null, no_suspend_block, yes_suspend_block, const_bool_false);
ir_set_cursor_at_end_and_append_block(irb, no_suspend_block);
@ -6886,8 +6895,6 @@ static IrInstruction *ir_gen_await_expr(IrBuilder *irb, Scope *scope, AstNode *n
ir_set_cursor_at_end_and_append_block(irb, yes_suspend_block);
IrInstruction *suspend_code = ir_build_coro_suspend(irb, scope, node, save_token, const_bool_false);
IrBasicBlock *cleanup_block = ir_create_basic_block(irb, scope, "SuspendCleanup");
IrBasicBlock *resume_block = ir_create_basic_block(irb, scope, "SuspendResume");
IrInstructionSwitchBrCase *cases = allocate<IrInstructionSwitchBrCase>(2);
cases[0].value = ir_build_const_u8(irb, scope, node, 0);