diff options
Diffstat (limited to 'llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td')
| -rw-r--r-- | llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td new file mode 100644 index 000000000000..1afc9a8790dc --- /dev/null +++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td @@ -0,0 +1,161 @@ +//===- WebAssemblyInstrControl.td-WebAssembly control-flow ------*- tablegen -*- +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +/// +/// \file +/// WebAssembly control-flow code-gen constructs. +/// +//===----------------------------------------------------------------------===// + +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>; +} // isBranch = 1, isTerminator = 1, hasCtrlDep = 1 + +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)>; + +// A list of branch targets enclosed in {} and separated by comma. +// Used by br_table only. +def BrListAsmOperand : AsmOperandClass { let Name = "BrList"; } +let OperandNamespace = "WebAssembly", OperandType = "OPERAND_BRLIST" in +def brlist : Operand<i32> { + let ParserMatchClass = BrListAsmOperand; + let PrintMethod = "printBrList"; +} + +// 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. +let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { +defm BR_TABLE_I32 : I<(outs), (ins I32:$index, variable_ops), + (outs), (ins brlist:$brl), + [(WebAssemblybr_table I32:$index)], + "br_table \t$index", "br_table \t$brl", + 0x0e>; +defm BR_TABLE_I64 : I<(outs), (ins I64:$index, variable_ops), + (outs), (ins brlist:$brl), + [(WebAssemblybr_table I64:$index)], + "br_table \t$index", "br_table \t$brl", + 0x0e>; +} // 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>; + +defm IF : I<(outs), (ins Signature:$sig, I32:$cond), + (outs), (ins Signature:$sig), + [], "if \t$sig, $cond", "if \t$sig", 0x04>; +defm ELSE : NRI<(outs), (ins), [], "else", 0x05>; + +// END_BLOCK, END_LOOP, END_IF 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>; +defm END_IF : NRI<(outs), (ins), [], "end_if", 0x0b>; +// Generic instruction, for disassembler. +let IsCanonical = 1 in +defm END : NRI<(outs), (ins), [], "end", 0x0b>; +let isTerminator = 1, isBarrier = 1 in +defm END_FUNCTION : NRI<(outs), (ins), [], "end_function", 0x0b>; +} // Uses = [VALUE_STACK], Defs = [VALUE_STACK] + + +let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in { + +let isReturn = 1 in { + +defm RETURN : I<(outs), (ins variable_ops), (outs), (ins), + [(WebAssemblyreturn)], + "return", "return", 0x0f>; +// Equivalent to RETURN, 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 : I<(outs), (ins variable_ops), (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 : I<(outs), (ins event_op:$tag, variable_ops), + (outs), (ins event_op:$tag), + [(WebAssemblythrow (WebAssemblywrapper texternalsym:$tag))], + "throw \t$tag", "throw \t$tag", 0x08>; +defm RETHROW : I<(outs), (ins EXNREF:$exn), (outs), (ins), [], + "rethrow \t$exn", "rethrow", 0x09>; +// Pseudo instruction to be the lowering target of int_wasm_rethrow_in_catch +// intrinsic. Will be converted to the real rethrow instruction later. +let isPseudo = 1 in +defm RETHROW_IN_CATCH : NRI<(outs), (ins), [(int_wasm_rethrow_in_catch)], + "rethrow_in_catch", 0>; +} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 + +// Region within which an exception is caught: try / end_try +let Uses = [VALUE_STACK], Defs = [VALUE_STACK] in { +defm TRY : NRI<(outs), (ins Signature:$sig), [], "try \t$sig", 0x06>; +defm END_TRY : NRI<(outs), (ins), [], "end_try", 0x0b>; +} // Uses = [VALUE_STACK], Defs = [VALUE_STACK] + +// Catching an exception: catch / extract_exception +let hasCtrlDep = 1, hasSideEffects = 1 in +defm CATCH : I<(outs EXNREF:$dst), (ins), (outs), (ins), [], + "catch \t$dst", "catch", 0x07>; + +// Querying / extracing exception: br_on_exn +// br_on_exn queries an exnref to see if it matches the corresponding exception +// tag index. If true it branches to the given label and pushes the +// corresponding argument values of the exception onto the stack. +let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in +defm BR_ON_EXN : I<(outs), (ins bb_op:$dst, event_op:$tag, EXNREF:$exn), + (outs), (ins bb_op:$dst, event_op:$tag), [], + "br_on_exn \t$dst, $tag, $exn", "br_on_exn \t$dst, $tag", + 0x0a>; +// This is a pseudo instruction that simulates popping a value from stack, which +// has been pushed by br_on_exn +let isCodeGenOnly = 1, hasSideEffects = 1 in +defm EXTRACT_EXCEPTION_I32 : NRI<(outs I32:$dst), (ins), + [(set I32:$dst, (int_wasm_extract_exception))], + "extract_exception\t$dst">; + +// Pseudo instructions: cleanupret / catchret +let isTerminator = 1, hasSideEffects = 1, isBarrier = 1, hasCtrlDep = 1, + isPseudo = 1, isEHScopeReturn = 1 in { + defm CLEANUPRET : NRI<(outs), (ins), [(cleanupret)], "cleanupret", 0>; + defm CATCHRET : NRI<(outs), (ins bb_op:$dst, bb_op:$from), + [(catchret bb:$dst, bb:$from)], "catchret", 0>; +} // isTerminator = 1, hasSideEffects = 1, isBarrier = 1, hasCtrlDep = 1, + // isPseudo = 1, isEHScopeReturn = 1 +} // Predicates = [HasExceptionHandling] |