1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_UTILS_TABLEGEN_DECODERTABLEEMITTER_H
10#define LLVM_UTILS_TABLEGEN_DECODERTABLEEMITTER_H
11
12#include "DecoderTree.h"
13#include "llvm/Support/FormattedStream.h"
14
15namespace llvm {
16
17struct DecoderTableInfo {
18 bool HasCheckPredicate = false;
19 bool HasSoftFail = false;
20};
21
22class DecoderTableEmitter {
23 DecoderTableInfo &TableInfo;
24 formatted_raw_ostream OS;
25
26 /// The number of positions occupied by the index in the output. Used to
27 /// right-align indices and left-align the text that follows them.
28 unsigned IndexWidth;
29
30 /// The current position in the output stream. After the table is emitted,
31 /// this is its size.
32 unsigned CurrentIndex;
33
34 /// The index of the first byte of the table row. Used as a label in the
35 /// comment following the row.
36 unsigned LineStartIndex;
37
38public:
39 DecoderTableEmitter(DecoderTableInfo &TableInfo, raw_ostream &OS)
40 : TableInfo(TableInfo), OS(OS) {}
41
42 void emitTable(StringRef TableName, unsigned BitWidth,
43 const DecoderTreeNode *Root);
44
45private:
46 unsigned computeNodeSize(const DecoderTreeNode *Node) const;
47 unsigned computeTableSize(const DecoderTreeNode *Root,
48 unsigned BitWidth) const;
49
50 void emitStartLine();
51 void emitOpcode(StringRef Name);
52 void emitByte(uint8_t Val);
53 void emitUInt8(unsigned Val);
54 void emitULEB128(uint64_t Val);
55 raw_ostream &emitComment(indent Indent);
56
57 void emitCheckAnyNode(const CheckAnyNode *N, indent Indent);
58 void emitCheckAllNode(const CheckAllNode *N, indent Indent);
59 void emitSwitchFieldNode(const SwitchFieldNode *N, indent Indent);
60 void emitCheckFieldNode(const CheckFieldNode *N, indent Indent);
61 void emitCheckPredicateNode(const CheckPredicateNode *N, indent Indent);
62 void emitSoftFailNode(const SoftFailNode *N, indent Indent);
63 void emitDecodeNode(const DecodeNode *N, indent Indent);
64 void emitNode(const DecoderTreeNode *N, indent Indent);
65};
66
67} // namespace llvm
68
69#endif // LLVM_UTILS_TABLEGEN_DECODERTABLEEMITTER_H
70