1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "jdwp/jdwp.h"
18
19 #include <inttypes.h>
20
21 #include "android-base/stringprintf.h"
22
23 #include "jdwp/jdwp_priv.h"
24
25 namespace art {
26
27 namespace JDWP {
28
Request(const uint8_t * bytes,uint32_t available)29 Request::Request(const uint8_t* bytes, uint32_t available) : p_(bytes) {
30 byte_count_ = Read4BE();
31 end_ = bytes + byte_count_;
32 CHECK_LE(byte_count_, available);
33
34 id_ = Read4BE();
35 int8_t flags = Read1();
36 if ((flags & kJDWPFlagReply) != 0) {
37 LOG(FATAL) << "reply?!";
38 }
39
40 command_set_ = Read1();
41 command_ = Read1();
42 }
43
~Request()44 Request::~Request() {
45 }
46
CheckConsumed()47 void Request::CheckConsumed() {
48 if (p_ < end_) {
49 CHECK(p_ == end_) << "read too few bytes: " << (end_ - p_);
50 } else if (p_ > end_) {
51 CHECK(p_ == end_) << "read too many bytes: " << (p_ - end_);
52 }
53 }
54
ReadUtf8String()55 std::string Request::ReadUtf8String() {
56 uint32_t length = Read4BE();
57 std::string s;
58 s.resize(length);
59 memcpy(&s[0], p_, length);
60 p_ += length;
61 VLOG(jdwp) << " string \"" << s << "\"";
62 return s;
63 }
64
65 // Helper function: read a variable-width value from the input buffer.
ReadValue(size_t width)66 uint64_t Request::ReadValue(size_t width) {
67 uint64_t value = -1;
68 switch (width) {
69 case 1: value = Read1(); break;
70 case 2: value = Read2BE(); break;
71 case 4: value = Read4BE(); break;
72 case 8: value = Read8BE(); break;
73 default: LOG(FATAL) << width;
74 }
75 return value;
76 }
77
ReadSigned32(const char * what)78 int32_t Request::ReadSigned32(const char* what) {
79 int32_t value = static_cast<int32_t>(Read4BE());
80 VLOG(jdwp) << " " << what << " " << value;
81 return value;
82 }
83
ReadUnsigned32(const char * what)84 uint32_t Request::ReadUnsigned32(const char* what) {
85 uint32_t value = Read4BE();
86 VLOG(jdwp) << " " << what << " " << value;
87 return value;
88 }
89
ReadFieldId()90 FieldId Request::ReadFieldId() {
91 FieldId id = Read8BE();
92 VLOG(jdwp) << " field id " << DescribeField(id);
93 return id;
94 }
95
ReadMethodId()96 MethodId Request::ReadMethodId() {
97 MethodId id = Read8BE();
98 VLOG(jdwp) << " method id " << DescribeMethod(id);
99 return id;
100 }
101
ReadObjectId(const char * specific_kind)102 ObjectId Request::ReadObjectId(const char* specific_kind) {
103 ObjectId id = Read8BE();
104 VLOG(jdwp) << android::base::StringPrintf(" %s id %#" PRIx64, specific_kind, id);
105 return id;
106 }
107
ReadArrayId()108 ObjectId Request::ReadArrayId() {
109 return ReadObjectId("array");
110 }
111
ReadObjectId()112 ObjectId Request::ReadObjectId() {
113 return ReadObjectId("object");
114 }
115
ReadThreadId()116 ObjectId Request::ReadThreadId() {
117 return ReadObjectId("thread");
118 }
119
ReadThreadGroupId()120 ObjectId Request::ReadThreadGroupId() {
121 return ReadObjectId("thread group");
122 }
123
ReadRefTypeId()124 RefTypeId Request::ReadRefTypeId() {
125 RefTypeId id = Read8BE();
126 VLOG(jdwp) << " ref type id " << DescribeRefTypeId(id);
127 return id;
128 }
129
ReadFrameId()130 FrameId Request::ReadFrameId() {
131 FrameId id = Read8BE();
132 VLOG(jdwp) << " frame id " << id;
133 return id;
134 }
135
ReadTag()136 JdwpTag Request::ReadTag() {
137 return ReadEnum1<JdwpTag>("tag");
138 }
139
ReadTypeTag()140 JdwpTypeTag Request::ReadTypeTag() {
141 return ReadEnum1<JdwpTypeTag>("type tag");
142 }
143
ReadLocation()144 JdwpLocation Request::ReadLocation() {
145 JdwpLocation location;
146 memset(&location, 0, sizeof(location)); // Allows memcmp(3) later.
147 location.type_tag = ReadTypeTag();
148 location.class_id = ReadObjectId("class");
149 location.method_id = ReadMethodId();
150 location.dex_pc = Read8BE();
151 VLOG(jdwp) << " location " << location;
152 return location;
153 }
154
ReadModKind()155 JdwpModKind Request::ReadModKind() {
156 return ReadEnum1<JdwpModKind>("mod kind");
157 }
158
Read1()159 uint8_t Request::Read1() {
160 return *p_++;
161 }
162
Read2BE()163 uint16_t Request::Read2BE() {
164 uint16_t result = p_[0] << 8 | p_[1];
165 p_ += 2;
166 return result;
167 }
168
Read4BE()169 uint32_t Request::Read4BE() {
170 uint32_t result = p_[0] << 24;
171 result |= p_[1] << 16;
172 result |= p_[2] << 8;
173 result |= p_[3];
174 p_ += 4;
175 return result;
176 }
177
Read8BE()178 uint64_t Request::Read8BE() {
179 uint64_t high = Read4BE();
180 uint64_t low = Read4BE();
181 return (high << 32) | low;
182 }
183
184 } // namespace JDWP
185
186 } // namespace art
187