//===- WebAssemblyInstrControl.td-WebAssembly control-flow ------*- tablegen -*- // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// /// /// \file /// \brief WebAssembly control-flow code-gen constructs. /// //===----------------------------------------------------------------------===// /* * TODO(jfb): Add the following. * * block: a fixed-length sequence of statements * if: if statement * do_while: do while statement, basically a loop with a conditional branch * forever: infinite loop statement (like while (1)), basically an unconditional * branch (back to the top of the loop) * continue: continue to start of nested loop * break: break to end from nested loop or block * switch: switch statement with fallthrough */ let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in { def BR_IF_ : I<(outs), (ins bb_op:$dst, I32:$a), [(brcond I32:$a, bb:$dst)]>; let isBarrier = 1 in { def BR : I<(outs), (ins bb_op:$dst), [(br bb:$dst)]>; } // isBarrier = 1 } // isBranch = 1, isTerminator = 1, hasCtrlDep = 1 // TODO: SelectionDAG's lowering insists on using a pointer as the index for // jump tables, so in practice we don't ever use SWITCH_I64 in wasm32 mode // currently. let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { def SWITCH_I32 : I<(outs), (ins I32:$index, variable_ops), [(WebAssemblyswitch I32:$index)]>; def SWITCH_I64 : I<(outs), (ins I64:$index, variable_ops), [(WebAssemblyswitch I64:$index)]>; } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 // Placemarkers to indicate the start of a block or loop scope. def BLOCK : I<(outs), (ins bb_op:$dst), []>; def LOOP : I<(outs), (ins bb_op:$dst), []>; multiclass RETURN { def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)]>; } let isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { defm : RETURN; defm : RETURN; defm : RETURN; defm : RETURN; def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)]>; } // isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1