1 //===- RecordSerialization.h ------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_DEBUGINFO_CODEVIEW_RECORDSERIALIZATION_H
11 #define LLVM_DEBUGINFO_CODEVIEW_RECORDSERIALIZATION_H
13 #include "llvm/ADT/APSInt.h"
14 #include "llvm/ADT/ArrayRef.h"
15 #include "llvm/ADT/StringRef.h"
16 #include "llvm/DebugInfo/CodeView/CodeView.h"
17 #include "llvm/DebugInfo/CodeView/CodeViewError.h"
18 #include "llvm/DebugInfo/MSF/StreamReader.h"
19 #include "llvm/Support/Endian.h"
20 #include "llvm/Support/Error.h"
26 using llvm::support::little32_t;
27 using llvm::support::ulittle16_t;
28 using llvm::support::ulittle32_t;
30 /// Limit on the size of all codeview symbol and type records, including the
31 /// RecordPrefix. MSVC does not emit any records larger than this.
32 enum : unsigned { MaxRecordLength = 0xFF00 };
35 ulittle16_t RecordLen; // Record length, starting from &RecordKind.
36 ulittle16_t RecordKind; // Record kind enum (SymRecordKind or TypeRecordKind)
39 /// Reinterpret a byte array as an array of characters. Does not interpret as
40 /// a C string, as StringRef has several helpers (split) that make that easy.
41 StringRef getBytesAsCharacters(ArrayRef<uint8_t> LeafData);
42 StringRef getBytesAsCString(ArrayRef<uint8_t> LeafData);
44 inline Error consume(msf::StreamReader &Reader) { return Error::success(); }
46 /// Decodes a numeric "leaf" value. These are integer literals encountered in
47 /// the type stream. If the value is positive and less than LF_NUMERIC (1 <<
48 /// 15), it is emitted directly in Data. Otherwise, it has a tag like LF_CHAR
49 /// that indicates the bitwidth and sign of the numeric data.
50 Error consume(msf::StreamReader &Reader, APSInt &Num);
52 /// Decodes a numeric leaf value that is known to be a particular type.
53 Error consume_numeric(msf::StreamReader &Reader, uint64_t &Value);
55 /// Decodes signed and unsigned fixed-length integers.
56 Error consume(msf::StreamReader &Reader, uint32_t &Item);
57 Error consume(msf::StreamReader &Reader, int32_t &Item);
59 /// Decodes a null terminated string.
60 Error consume(msf::StreamReader &Reader, StringRef &Item);
62 Error consume(StringRef &Data, APSInt &Num);
63 Error consume(StringRef &Data, uint32_t &Item);
65 /// Decodes an arbitrary object whose layout matches that of the underlying
66 /// byte sequence, and returns a pointer to the object.
67 template <typename T> Error consume(msf::StreamReader &Reader, T *&Item) {
68 return Reader.readObject(Item);
71 template <typename T, typename U> struct serialize_conditional_impl {
72 serialize_conditional_impl(T &Item, U Func) : Item(Item), Func(Func) {}
74 Error deserialize(msf::StreamReader &Reader) const {
76 return Error::success();
77 return consume(Reader, Item);
84 template <typename T, typename U>
85 serialize_conditional_impl<T, U> serialize_conditional(T &Item, U Func) {
86 return serialize_conditional_impl<T, U>(Item, Func);
89 template <typename T, typename U> struct serialize_array_impl {
90 serialize_array_impl(ArrayRef<T> &Item, U Func) : Item(Item), Func(Func) {}
92 Error deserialize(msf::StreamReader &Reader) const {
93 return Reader.readArray(Item, Func());
100 template <typename T> struct serialize_vector_tail_impl {
101 serialize_vector_tail_impl(std::vector<T> &Item) : Item(Item) {}
103 Error deserialize(msf::StreamReader &Reader) const {
105 // Stop when we run out of bytes or we hit record padding bytes.
106 while (!Reader.empty() && Reader.peek() < LF_PAD0) {
107 if (auto EC = consume(Reader, Field))
109 Item.push_back(Field);
111 return Error::success();
114 std::vector<T> &Item;
117 struct serialize_null_term_string_array_impl {
118 serialize_null_term_string_array_impl(std::vector<StringRef> &Item)
121 Error deserialize(msf::StreamReader &Reader) const {
123 return make_error<CodeViewError>(cv_error_code::insufficient_buffer,
124 "Null terminated string is empty!");
126 while (Reader.peek() != 0) {
128 if (auto EC = Reader.readZeroString(Field))
130 Item.push_back(Field);
132 return Reader.skip(1);
135 std::vector<StringRef> &Item;
138 template <typename T> struct serialize_arrayref_tail_impl {
139 serialize_arrayref_tail_impl(ArrayRef<T> &Item) : Item(Item) {}
141 Error deserialize(msf::StreamReader &Reader) const {
142 uint32_t Count = Reader.bytesRemaining() / sizeof(T);
143 return Reader.readArray(Item, Count);
149 template <typename T> struct serialize_numeric_impl {
150 serialize_numeric_impl(T &Item) : Item(Item) {}
152 Error deserialize(msf::StreamReader &Reader) const {
153 return consume_numeric(Reader, Item);
159 template <typename T, typename U>
160 serialize_array_impl<T, U> serialize_array(ArrayRef<T> &Item, U Func) {
161 return serialize_array_impl<T, U>(Item, Func);
164 inline serialize_null_term_string_array_impl
165 serialize_null_term_string_array(std::vector<StringRef> &Item) {
166 return serialize_null_term_string_array_impl(Item);
169 template <typename T>
170 serialize_vector_tail_impl<T> serialize_array_tail(std::vector<T> &Item) {
171 return serialize_vector_tail_impl<T>(Item);
174 template <typename T>
175 serialize_arrayref_tail_impl<T> serialize_array_tail(ArrayRef<T> &Item) {
176 return serialize_arrayref_tail_impl<T>(Item);
179 template <typename T> serialize_numeric_impl<T> serialize_numeric(T &Item) {
180 return serialize_numeric_impl<T>(Item);
183 // This field is only present in the byte record if the condition is true. The
184 // condition is evaluated lazily, so it can depend on items that were
187 #define CV_CONDITIONAL_FIELD(I, C) \
188 serialize_conditional(I, [&]() { return !!(C); })
190 // This is an array of N items, where N is evaluated lazily, so it can refer
191 // to a field deserialized earlier.
192 #define CV_ARRAY_FIELD_N(I, N) serialize_array(I, [&]() { return N; })
194 // This is an array that exhausts the remainder of the input buffer.
195 #define CV_ARRAY_FIELD_TAIL(I) serialize_array_tail(I)
197 // This is an array that consumes null terminated strings until a double null
199 #define CV_STRING_ARRAY_NULL_TERM(I) serialize_null_term_string_array(I)
201 #define CV_NUMERIC_FIELD(I) serialize_numeric(I)
203 template <typename T, typename U>
204 Error consume(msf::StreamReader &Reader,
205 const serialize_conditional_impl<T, U> &Item) {
206 return Item.deserialize(Reader);
209 template <typename T, typename U>
210 Error consume(msf::StreamReader &Reader,
211 const serialize_array_impl<T, U> &Item) {
212 return Item.deserialize(Reader);
215 inline Error consume(msf::StreamReader &Reader,
216 const serialize_null_term_string_array_impl &Item) {
217 return Item.deserialize(Reader);
220 template <typename T>
221 Error consume(msf::StreamReader &Reader,
222 const serialize_vector_tail_impl<T> &Item) {
223 return Item.deserialize(Reader);
226 template <typename T>
227 Error consume(msf::StreamReader &Reader,
228 const serialize_arrayref_tail_impl<T> &Item) {
229 return Item.deserialize(Reader);
232 template <typename T>
233 Error consume(msf::StreamReader &Reader,
234 const serialize_numeric_impl<T> &Item) {
235 return Item.deserialize(Reader);
238 template <typename T, typename U, typename... Args>
239 Error consume(msf::StreamReader &Reader, T &&X, U &&Y, Args &&... Rest) {
240 if (auto EC = consume(Reader, X))
242 return consume(Reader, Y, std::forward<Args>(Rest)...);
245 #define CV_DESERIALIZE(...) \
246 if (auto EC = consume(__VA_ARGS__)) \
247 return std::move(EC);