| //===- 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 | |
| /// 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. | |
| defm BR_IF : I<(outs), (ins bb_op:$dst, I32:$cond), | |
| (outs), (ins bb_op:$dst), | |
| [(brcond I32:$cond, bb:$dst)], | |
| "br_if \t$dst, $cond", "br_if \t$dst", 0x0d>; | |
| let isCodeGenOnly = 1 in | |
| defm BR_UNLESS : I<(outs), (ins bb_op:$dst, I32:$cond), | |
| (outs), (ins bb_op:$dst), []>; | |
| let isBarrier = 1 in { | |
| defm BR : NRI<(outs), (ins bb_op:$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. | |
| // FIXME: this can't inherit from I<> since there is no way to inherit from a | |
| // multiclass and still have the let statements. | |
| let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { | |
| def BR_TABLE_I32 : NI<(outs), (ins I32:$index, variable_ops), | |
| [(WebAssemblybr_table I32:$index)], 0, | |
| "br_table \t$index", 0x0e> { | |
| let TSFlags{0} = 1; | |
| let TSFlags{1} = 1; | |
| } | |
| def BR_TABLE_I32_S : NI<(outs), (ins I32:$index), | |
| [], 1, | |
| "br_table \t$index", 0x0e> { | |
| let TSFlags{0} = 1; | |
| let TSFlags{1} = 1; | |
| } | |
| def BR_TABLE_I64 : NI<(outs), (ins I64:$index, variable_ops), | |
| [(WebAssemblybr_table I64:$index)], 0, | |
| "br_table \t$index"> { | |
| let TSFlags{0} = 1; | |
| let TSFlags{1} = 1; | |
| } | |
| def BR_TABLE_I64_S : NI<(outs), (ins I64:$index), | |
| [], 1, | |
| "br_table \t$index"> { | |
| let TSFlags{0} = 1; | |
| let TSFlags{1} = 1; | |
| } | |
| } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 | |
| // This is technically a control-flow instruction, since all it affects is the | |
| // IP. | |
| defm NOP : NRI<(outs), (ins), [], "nop", 0x01>; | |
| // Placemarkers to indicate the start or end of a block or loop 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 { | |
| defm BLOCK : NRI<(outs), (ins Signature:$sig), [], "block \t$sig", 0x02>; | |
| defm LOOP : NRI<(outs), (ins Signature:$sig), [], "loop \t$sig", 0x03>; | |
| // END_BLOCK, END_LOOP, and END_FUNCTION are represented with the same opcode in | |
| // wasm. | |
| defm END_BLOCK : NRI<(outs), (ins), [], "end_block", 0x0b>; | |
| defm END_LOOP : NRI<(outs), (ins), [], "end_loop", 0x0b>; | |
| let isTerminator = 1, isBarrier = 1 in | |
| defm END_FUNCTION : NRI<(outs), (ins), [], "end_function", 0x0b>; | |
| } // Uses = [VALUE_STACK], Defs = [VALUE_STACK] | |
| multiclass RETURN<WebAssemblyRegClass vt> { | |
| defm RETURN_#vt : I<(outs), (ins vt:$val), (outs), (ins), | |
| [(WebAssemblyreturn vt:$val)], | |
| "return \t$val", "return", 0x0f>; | |
| // Equivalent to RETURN_#vt, for use at the end of a function when wasm | |
| // semantics return by falling off the end of the block. | |
| let isCodeGenOnly = 1 in | |
| defm FALLTHROUGH_RETURN_#vt : I<(outs), (ins vt:$val), (outs), (ins), []>; | |
| } | |
| multiclass SIMD_RETURN<ValueType vt> { | |
| defm RETURN_#vt : SIMD_I<(outs), (ins V128:$val), (outs), (ins), | |
| [(WebAssemblyreturn (vt V128:$val))], | |
| "return \t$val", "return", 0x0f>; | |
| // Equivalent to RETURN_#vt, for use at the end of a function when wasm | |
| // semantics return by falling off the end of the block. | |
| let isCodeGenOnly = 1 in | |
| defm FALLTHROUGH_RETURN_#vt : SIMD_I<(outs), (ins V128:$val), (outs), (ins), | |
| []>; | |
| } | |
| 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 "": RETURN<EXCEPT_REF>; | |
| defm "": SIMD_RETURN<v16i8>; | |
| defm "": SIMD_RETURN<v8i16>; | |
| defm "": SIMD_RETURN<v4i32>; | |
| defm "": SIMD_RETURN<v4f32>; | |
| defm RETURN_VOID : NRI<(outs), (ins), [(WebAssemblyreturn)], "return", 0x0f>; | |
| // This is to RETURN_VOID what FALLTHROUGH_RETURN_#vt is to RETURN_#vt. | |
| let isCodeGenOnly = 1 in | |
| defm FALLTHROUGH_RETURN_VOID : NRI<(outs), (ins), []>; | |
| } // isReturn = 1 | |
| defm UNREACHABLE : NRI<(outs), (ins), [(trap)], "unreachable", 0x00>; | |
| } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 | |
| //===----------------------------------------------------------------------===// | |
| // Exception handling instructions | |
| //===----------------------------------------------------------------------===// | |
| let Predicates = [HasExceptionHandling] in { | |
| // Throwing an exception: throw / rethrow | |
| let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { | |
| defm THROW_I32 : I<(outs), (ins i32imm:$tag, I32:$val), | |
| (outs), (ins i32imm:$tag), | |
| [(int_wasm_throw imm:$tag, I32:$val)], | |
| "throw \t$tag, $val", "throw \t$tag", | |
| 0x08>; | |
| defm THROW_I64 : I<(outs), (ins i32imm:$tag, I64:$val), | |
| (outs), (ins i32imm:$tag), | |
| [(int_wasm_throw imm:$tag, I64:$val)], | |
| "throw \t$tag, $val", "throw \t$tag", | |
| 0x08>; | |
| defm RETHROW : NRI<(outs), (ins bb_op:$dst), [], "rethrow \t$dst", 0x09>; | |
| let isCodeGenOnly = 1 in | |
| // This is used when the destination for rethrow is the caller function. This | |
| // will be converted to a rethrow in CFGStackify. | |
| defm RETHROW_TO_CALLER : NRI<(outs), (ins), [], "rethrow">; | |
| } // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 | |
| // Region within which an exception is caught: try / end_try | |
| let Uses = [VALUE_STACK], Defs = [VALUE_STACK] in { | |
| defm TRY : NRI<(outs), (ins Signature:$sig), [], "try \t$sig", 0x06>; | |
| defm END_TRY : NRI<(outs), (ins), [], "end_try", 0x0b>; | |
| } // Uses = [VALUE_STACK], Defs = [VALUE_STACK] | |
| // Catching an exception: catch / catch_all | |
| let hasCtrlDep = 1 in { | |
| defm CATCH_I32 : I<(outs I32:$dst), (ins i32imm:$tag), | |
| (outs), (ins i32imm:$tag), | |
| [(set I32:$dst, (int_wasm_catch imm:$tag))], | |
| "i32.catch \t$dst, $tag", "i32.catch \t$tag", 0x07>; | |
| defm CATCH_I64 : I<(outs I64:$dst), (ins i32imm:$tag), | |
| (outs), (ins i32imm:$tag), | |
| [(set I64:$dst, (int_wasm_catch imm:$tag))], | |
| "i64.catch \t$dst, $tag", "i64.catch \t$tag", 0x07>; | |
| defm CATCH_ALL : NRI<(outs), (ins), [], "catch_all", 0x05>; | |
| } | |
| // Pseudo instructions: cleanupret / catchret | |
| // They are not return instructions in wasm, but setting 'isReturn' to true as | |
| // in X86 is necessary for computing EH scope membership. | |
| let isTerminator = 1, hasSideEffects = 1, isBarrier = 1, hasCtrlDep = 1, | |
| isCodeGenOnly = 1, isReturn = 1 in { | |
| defm CLEANUPRET : NRI<(outs), (ins), [(cleanupret)], "", 0>; | |
| defm CATCHRET : NRI<(outs), (ins bb_op:$dst, bb_op:$from), | |
| [(catchret bb:$dst, bb:$from)], "", 0>; | |
| } | |
| } | |
| } // Defs = [ARGUMENTS] |