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116 lines
4.5 KiB
116 lines
4.5 KiB
//===- GIMatchDagInstr.h - Represent a instruction to be matched ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_GIMATCHDAGINSTR_H
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#define LLVM_UTILS_TABLEGEN_GIMATCHDAGINSTR_H
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#include "GIMatchDagOperands.h"
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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class GIMatchDag;
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/// Represents an instruction in the match DAG. This object knows very little
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/// about the actual instruction to be matched as the bulk of that is in
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/// predicates that are associated with the match DAG. It merely knows the names
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/// and indices of any operands that need to be matched in order to allow edges
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/// to link to them.
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///
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/// Instances of this class objects are owned by the GIMatchDag and are not
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/// shareable between instances of GIMatchDag. This is because the Name,
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/// IsMatchRoot, and OpcodeAnnotation are likely to differ between GIMatchDag
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/// instances.
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class GIMatchDagInstr {
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public:
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using const_user_assigned_operand_names_iterator =
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DenseMap<unsigned, StringRef>::const_iterator;
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protected:
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/// The match DAG this instruction belongs to.
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GIMatchDag &Dag;
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/// The name of the instruction in the pattern. For example:
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/// (FOO $a, $b, $c):$name
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/// will cause name to be assigned to this member. Anonymous instructions will
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/// have a name assigned for debugging purposes.
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StringRef Name;
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/// The name of the instruction in the pattern as assigned by the user. For
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/// example:
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/// (FOO $a, $b, $c):$name
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/// will cause name to be assigned to this member. If a name is not provided,
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/// this will be empty. This name is used to bind variables from rules to the
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/// matched instruction.
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StringRef UserAssignedName;
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/// The name of each operand (if any) that was assigned by the user. For
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/// example:
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/// (FOO $a, $b, $c):$name
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/// will cause {0, "a"}, {1, "b"}, {2, "c} to be inserted into this map.
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DenseMap<unsigned, StringRef> UserAssignedNamesForOperands;
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/// The operand list for this instruction. This object may be shared with
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/// other instructions of a similar 'shape'.
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const GIMatchDagOperandList &OperandInfo;
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/// For debugging purposes, it's helpful to have access to a description of
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/// the Opcode. However, this object shouldn't use it for more than debugging
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/// output since predicates are expected to be handled outside the DAG.
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CodeGenInstruction *OpcodeAnnotation = 0;
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/// When true, this instruction will be a starting point for a match attempt.
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bool IsMatchRoot = false;
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public:
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GIMatchDagInstr(GIMatchDag &Dag, StringRef Name, StringRef UserAssignedName,
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const GIMatchDagOperandList &OperandInfo)
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: Dag(Dag), Name(Name), UserAssignedName(UserAssignedName),
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OperandInfo(OperandInfo) {}
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const GIMatchDagOperandList &getOperandInfo() const { return OperandInfo; }
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StringRef getName() const { return Name; }
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StringRef getUserAssignedName() const { return UserAssignedName; }
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void assignNameToOperand(unsigned Idx, StringRef Name) {
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assert(UserAssignedNamesForOperands[Idx].empty() && "Cannot assign twice");
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UserAssignedNamesForOperands[Idx] = Name;
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}
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const_user_assigned_operand_names_iterator
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user_assigned_operand_names_begin() const {
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return UserAssignedNamesForOperands.begin();
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}
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const_user_assigned_operand_names_iterator
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user_assigned_operand_names_end() const {
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return UserAssignedNamesForOperands.end();
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}
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iterator_range<const_user_assigned_operand_names_iterator>
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user_assigned_operand_names() const {
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return make_range(user_assigned_operand_names_begin(),
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user_assigned_operand_names_end());
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}
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/// Mark this instruction as being a root of the match. This means that the
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/// matcher will start from this node when attempting to match MIR.
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void setMatchRoot();
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bool isMatchRoot() const { return IsMatchRoot; }
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void setOpcodeAnnotation(CodeGenInstruction *I) { OpcodeAnnotation = I; }
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CodeGenInstruction *getOpcodeAnnotation() const { return OpcodeAnnotation; }
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void print(raw_ostream &OS) const;
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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LLVM_DUMP_METHOD void dump() const { print(errs()); }
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#endif // if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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};
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raw_ostream &operator<<(raw_ostream &OS, const GIMatchDagInstr &N);
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} // end namespace llvm
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#endif // ifndef LLVM_UTILS_TABLEGEN_GIMATCHDAGINSTR_H
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