134 lines
5.1 KiB
TableGen
134 lines
5.1 KiB
TableGen
//===- WebAssemblyInstrControl.td-WebAssembly control-flow ------*- tablegen -*-
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief WebAssembly control-flow code-gen constructs.
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///
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//===----------------------------------------------------------------------===//
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let Defs = [ARGUMENTS] in {
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let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in {
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// The condition operand is a boolean value which WebAssembly represents as i32.
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def BR_IF : I<(outs), (ins bb_op:$dst, I32:$cond),
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[(brcond I32:$cond, bb:$dst)],
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"br_if \t$dst, $cond", 0x0d>;
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let isCodeGenOnly = 1 in
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def BR_UNLESS : I<(outs), (ins bb_op:$dst, I32:$cond), []>;
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let isBarrier = 1 in {
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def BR : I<(outs), (ins bb_op:$dst),
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[(br bb:$dst)],
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"br \t$dst", 0x0c>;
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} // isBarrier = 1
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} // isBranch = 1, isTerminator = 1, hasCtrlDep = 1
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} // Defs = [ARGUMENTS]
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def : Pat<(brcond (i32 (setne I32:$cond, 0)), bb:$dst),
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(BR_IF bb_op:$dst, I32:$cond)>;
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def : Pat<(brcond (i32 (seteq I32:$cond, 0)), bb:$dst),
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(BR_UNLESS bb_op:$dst, I32:$cond)>;
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let Defs = [ARGUMENTS] in {
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// TODO: SelectionDAG's lowering insists on using a pointer as the index for
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// jump tables, so in practice we don't ever use BR_TABLE_I64 in wasm32 mode
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// currently.
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// Set TSFlags{0} to 1 to indicate that the variable_ops are immediates.
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// Set TSFlags{1} to 1 to indicate that the immediates represent labels.
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let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
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def BR_TABLE_I32 : I<(outs), (ins I32:$index, variable_ops),
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[(WebAssemblybr_table I32:$index)],
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"br_table \t$index", 0x0e> {
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let TSFlags{0} = 1;
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let TSFlags{1} = 1;
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}
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def BR_TABLE_I64 : I<(outs), (ins I64:$index, variable_ops),
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[(WebAssemblybr_table I64:$index)],
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"br_table \t$index"> {
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let TSFlags{0} = 1;
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let TSFlags{1} = 1;
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}
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} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
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// Placemarkers to indicate the start or end of a block, loop, or try scope.
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// These use/clobber VALUE_STACK to prevent them from being moved into the
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// middle of an expression tree.
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let Uses = [VALUE_STACK], Defs = [VALUE_STACK] in {
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def BLOCK : I<(outs), (ins Signature:$sig), [], "block \t$sig", 0x02>;
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def LOOP : I<(outs), (ins Signature:$sig), [], "loop \t$sig", 0x03>;
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def TRY : I<(outs), (ins Signature:$sig), [], "try \t$sig", 0x06>;
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// END_BLOCK, END_LOOP, END_TRY, and END_FUNCTION are represented with the same
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// opcode in wasm.
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def END_BLOCK : I<(outs), (ins), [], "end_block", 0x0b>;
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def END_LOOP : I<(outs), (ins), [], "end_loop", 0x0b>;
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def END_TRY : I<(outs), (ins), [], "end_try", 0x0b>;
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let isTerminator = 1, isBarrier = 1 in
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def END_FUNCTION : I<(outs), (ins), [], "end_function", 0x0b>;
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} // Uses = [VALUE_STACK], Defs = [VALUE_STACK]
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multiclass RETURN<WebAssemblyRegClass vt> {
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def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)],
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"return \t$val", 0x0f>;
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// Equivalent to RETURN_#vt, for use at the end of a function when wasm
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// semantics return by falling off the end of the block.
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let isCodeGenOnly = 1 in
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def FALLTHROUGH_RETURN_#vt : I<(outs), (ins vt:$val), []>;
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}
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multiclass SIMD_RETURN<ValueType vt> {
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def RETURN_#vt : SIMD_I<(outs), (ins V128:$val),
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[(WebAssemblyreturn (vt V128:$val))],
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"return \t$val", 0x0f>;
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// Equivalent to RETURN_#vt, for use at the end of a function when wasm
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// semantics return by falling off the end of the block.
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let isCodeGenOnly = 1 in
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def FALLTHROUGH_RETURN_#vt : SIMD_I<(outs), (ins V128:$val), []>;
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}
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let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
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let isReturn = 1 in {
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defm : RETURN<I32>;
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defm : RETURN<I64>;
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defm : RETURN<F32>;
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defm : RETURN<F64>;
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defm : SIMD_RETURN<v16i8>;
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defm : SIMD_RETURN<v8i16>;
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defm : SIMD_RETURN<v4i32>;
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defm : SIMD_RETURN<v4f32>;
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def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)], "return", 0x0f>;
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// This is to RETURN_VOID what FALLTHROUGH_RETURN_#vt is to RETURN_#vt.
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let isCodeGenOnly = 1 in
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def FALLTHROUGH_RETURN_VOID : I<(outs), (ins), []>;
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} // isReturn = 1
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def UNREACHABLE : I<(outs), (ins), [(trap)], "unreachable", 0x00>;
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def THROW_I32 : I<(outs), (ins i32imm:$tag, I32:$obj),
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[(int_wasm_throw imm:$tag, I32:$obj)], "throw \t$tag, $obj",
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0x08>;
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def THROW_I64 : I<(outs), (ins i32imm:$tag, I64:$obj),
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[(int_wasm_throw imm:$tag, I64:$obj)], "throw \t$tag, $obj",
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0x08>;
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def RETHROW : I<(outs), (ins i32imm:$rel_depth), [], "rethrow \t$rel_depth",
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0x09>;
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} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
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} // Defs = [ARGUMENTS]
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// rethrow takes a relative depth as an argument, for which currently only 0 is
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// possible for C++. Once other languages need depths other than 0, depths will
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// be computed in CFGStackify.
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def : Pat<(int_wasm_rethrow), (RETHROW 0)>;
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