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//===- 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<WebAssemblyRegClass vt> {
def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)]>;
}
let isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
defm : RETURN<I32>;
defm : RETURN<I64>;
defm : RETURN<F32>;
defm : RETURN<F64>;
def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)]>;
} // isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
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