| //===- 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. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| let Defs = [ARGUMENTS] in { |
| |
| let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in { |
| // The condition operand is a boolean value which WebAssembly represents as i32. |
| def BR_IF : I<(outs), (ins bb_op:$dst, I32:$cond), |
| [(brcond I32:$cond, bb:$dst)], |
| "br_if \t$dst, $cond">; |
| let isCodeGenOnly = 1 in |
| def BR_UNLESS : I<(outs), (ins bb_op:$dst, I32:$cond), [], |
| "br_unless\t$dst, $cond">; |
| let isBarrier = 1 in { |
| def BR : I<(outs), (ins bb_op:$dst), |
| [(br bb:$dst)], |
| "br \t$dst">; |
| } // isBarrier = 1 |
| } // isBranch = 1, isTerminator = 1, hasCtrlDep = 1 |
| |
| } // Defs = [ARGUMENTS] |
| |
| def : Pat<(brcond (i32 (setne I32:$cond, 0)), bb:$dst), |
| (BR_IF bb_op:$dst, I32:$cond)>; |
| def : Pat<(brcond (i32 (seteq I32:$cond, 0)), bb:$dst), |
| (BR_UNLESS bb_op:$dst, I32:$cond)>; |
| |
| let Defs = [ARGUMENTS] in { |
| |
| // TODO: SelectionDAG's lowering insists on using a pointer as the index for |
| // jump tables, so in practice we don't ever use BR_TABLE_I64 in wasm32 mode |
| // currently. |
| // Set TSFlags{0} to 1 to indicate that the variable_ops are immediates. |
| // Set TSFlags{1} to 1 to indicate that the immediates represent labels. |
| let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { |
| def BR_TABLE_I32 : I<(outs), (ins I32:$index, variable_ops), |
| [(WebAssemblybr_table I32:$index)], |
| "br_table \t$index"> { |
| let TSFlags{0} = 1; |
| let TSFlags{1} = 1; |
| } |
| def BR_TABLE_I64 : I<(outs), (ins I64:$index, variable_ops), |
| [(WebAssemblybr_table I64:$index)], |
| "br_table \t$index"> { |
| let TSFlags{0} = 1; |
| let TSFlags{1} = 1; |
| } |
| } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 |
| |
| // Placemarkers to indicate the start or end of a block or loop scope. These |
| // use/clobber EXPR_STACK to prevent them from being moved into the middle of |
| // an expression tree. |
| let Uses = [EXPR_STACK], Defs = [EXPR_STACK] in { |
| def BLOCK : I<(outs), (ins), [], "block">; |
| def LOOP : I<(outs), (ins), [], "loop">; |
| def END_BLOCK : I<(outs), (ins), [], "end_block">; |
| def END_LOOP : I<(outs), (ins), [], "end_loop">; |
| } // Uses = [EXPR_STACK], Defs = [EXPR_STACK] |
| |
| multiclass RETURN<WebAssemblyRegClass vt> { |
| def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)], |
| "return \t$val">; |
| // Equivalent to RETURN_#vt, for use at the end of a function when wasm |
| // semantics return by falling off the end of the block. |
| let isCodeGenOnly = 1 in |
| def FALLTHROUGH_RETURN_#vt : I<(outs), (ins vt:$val), []>; |
| } |
| |
| let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { |
| let isReturn = 1 in { |
| defm : RETURN<I32>; |
| defm : RETURN<I64>; |
| defm : RETURN<F32>; |
| defm : RETURN<F64>; |
| def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)], "return">; |
| |
| // This is to RETURN_VOID what FALLTHROUGH_RETURN_#vt is to RETURN_#vt. |
| let isCodeGenOnly = 1 in |
| def FALLTHROUGH_RETURN_VOID : I<(outs), (ins), []>; |
| } // isReturn = 1 |
| def UNREACHABLE : I<(outs), (ins), [(trap)], "unreachable">; |
| } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 |
| |
| } // Defs = [ARGUMENTS] |