| //===- 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, $cond", 0x0d>; |
| let isCodeGenOnly = 1 in |
| def BR_UNLESS : I<(outs), (ins bb_op:$dst, I32:$cond), []>; |
| let isBarrier = 1 in { |
| def BR : I<(outs), (ins bb_op:$dst), |
| [(br bb:$dst)], |
| "br \t$dst", 0x0c>; |
| } // 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$index", 0x0e> { |
| let TSFlags{0} = 1; |
| let TSFlags{1} = 1; |
| } |
| def BR_TABLE_I64 : I<(outs), (ins I64:$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, loop, or try scope. |
| // These use/clobber VALUE_STACK to prevent them from being moved into the |
| // middle of an expression tree. |
| let Uses = [VALUE_STACK], Defs = [VALUE_STACK] in { |
| def BLOCK : I<(outs), (ins Signature:$sig), [], "block \t$sig", 0x02>; |
| def LOOP : I<(outs), (ins Signature:$sig), [], "loop \t$sig", 0x03>; |
| def TRY : I<(outs), (ins Signature:$sig), [], "try \t$sig", 0x06>; |
| |
| // END_BLOCK, END_LOOP, END_TRY, and END_FUNCTION are represented with the same |
| // opcode in wasm. |
| def END_BLOCK : I<(outs), (ins), [], "end_block", 0x0b>; |
| def END_LOOP : I<(outs), (ins), [], "end_loop", 0x0b>; |
| def END_TRY : I<(outs), (ins), [], "end_try", 0x0b>; |
| let isTerminator = 1, isBarrier = 1 in |
| def END_FUNCTION : I<(outs), (ins), [], "end_function", 0x0b>; |
| } // Uses = [VALUE_STACK], Defs = [VALUE_STACK] |
| |
| multiclass RETURN<WebAssemblyRegClass vt> { |
| def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)], |
| "return \t$val", 0x0f>; |
| // Equivalent to RETURN_#vt, for use at the end of a function when wasm |
| // semantics return by falling off the end of the block. |
| let isCodeGenOnly = 1 in |
| def FALLTHROUGH_RETURN_#vt : I<(outs), (ins vt:$val), []>; |
| } |
| |
| multiclass SIMD_RETURN<ValueType vt> { |
| def RETURN_#vt : SIMD_I<(outs), (ins V128:$val), |
| [(WebAssemblyreturn (vt V128:$val))], |
| "return \t$val", 0x0f>; |
| // Equivalent to RETURN_#vt, for use at the end of a function when wasm |
| // semantics return by falling off the end of the block. |
| let isCodeGenOnly = 1 in |
| def FALLTHROUGH_RETURN_#vt : SIMD_I<(outs), (ins V128:$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>; |
| defm : SIMD_RETURN<v16i8>; |
| defm : SIMD_RETURN<v8i16>; |
| defm : SIMD_RETURN<v4i32>; |
| defm : SIMD_RETURN<v4f32>; |
| |
| def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)], "return", 0x0f>; |
| |
| // 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", 0x00>; |
| |
| def THROW_I32 : I<(outs), (ins i32imm:$tag, I32:$obj), |
| [(int_wasm_throw imm:$tag, I32:$obj)], "throw \t$tag, $obj", |
| 0x08>; |
| def THROW_I64 : I<(outs), (ins i32imm:$tag, I64:$obj), |
| [(int_wasm_throw imm:$tag, I64:$obj)], "throw \t$tag, $obj", |
| 0x08>; |
| def RETHROW : I<(outs), (ins i32imm:$rel_depth), [], "rethrow \t$rel_depth", |
| 0x09>; |
| |
| } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 |
| |
| } // Defs = [ARGUMENTS] |
| |
| // rethrow takes a relative depth as an argument, for which currently only 0 is |
| // possible for C++. Once other languages need depths other than 0, depths will |
| // be computed in CFGStackify. |
| def : Pat<(int_wasm_rethrow), (RETHROW 0)>; |