1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
//===- StreamableMemoryObject.cpp - Streamable data interface - -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/StreamableMemoryObject.h"
#include <cassert>
#include <cstring>
using namespace llvm;
namespace {
class RawMemoryObject : public StreamableMemoryObject {
public:
RawMemoryObject(const unsigned char *Start, const unsigned char *End) :
FirstChar(Start), LastChar(End) {
assert(LastChar > FirstChar && "Invalid start/end range");
}
virtual uint64_t getBase() const { return 0; }
virtual uint64_t getExtent() { return LastChar - FirstChar; }
virtual int readByte(uint64_t address, uint8_t* ptr);
virtual int readBytes(uint64_t address,
uint64_t size,
uint8_t* buf,
uint64_t* copied);
virtual const uint8_t *getPointer(uint64_t address, uint64_t size);
virtual bool isValidAddress(uint64_t address) {return validAddress(address);}
virtual bool isObjectEnd(uint64_t address) {return objectEnd(address);}
private:
const uint8_t* const FirstChar;
const uint8_t* const LastChar;
// These are implemented as inline functions here to avoid multiple virtual
// calls per public function
bool validAddress(uint64_t address) {
return static_cast<ptrdiff_t>(address) < LastChar - FirstChar;
}
bool objectEnd(uint64_t address) {
return static_cast<ptrdiff_t>(address) == LastChar - FirstChar;
}
RawMemoryObject(const RawMemoryObject&); // DO NOT IMPLEMENT
void operator=(const RawMemoryObject&); // DO NOT IMPLEMENT
};
int RawMemoryObject::readByte(uint64_t address, uint8_t* ptr) {
if (!validAddress(address)) return -1;
*ptr = *((uint8_t *)(uintptr_t)(address + FirstChar));
return 0;
}
int RawMemoryObject::readBytes(uint64_t address,
uint64_t size,
uint8_t* buf,
uint64_t* copied) {
if (!validAddress(address) || !validAddress(address + size - 1)) return -1;
memcpy(buf, (uint8_t *)(uintptr_t)(address + FirstChar), size);
if (copied) *copied = size;
return size;
}
const uint8_t *RawMemoryObject::getPointer(uint64_t address, uint64_t size) {
return FirstChar + address;
}
} // anonymous namespace
namespace llvm {
// If the bitcode has a header, then its size is known, and we don't have to
// block until we actually want to read it.
bool StreamingMemoryObject::isValidAddress(uint64_t address) {
if (ObjectSize && address < ObjectSize) return true;
return fetchToPos(address);
}
bool StreamingMemoryObject::isObjectEnd(uint64_t address) {
if (ObjectSize) return address == ObjectSize;
fetchToPos(address);
return address == ObjectSize && address != 0;
}
uint64_t StreamingMemoryObject::getExtent() {
if (ObjectSize) return ObjectSize;
size_t pos = BytesRead + kChunkSize;
// keep fetching until we run out of bytes
while (fetchToPos(pos)) pos += kChunkSize;
return ObjectSize;
}
int StreamingMemoryObject::readByte(uint64_t address, uint8_t* ptr) {
if (!fetchToPos(address)) return -1;
*ptr = Bytes[address + BytesSkipped];
return 0;
}
int StreamingMemoryObject::readBytes(uint64_t address,
uint64_t size,
uint8_t* buf,
uint64_t* copied) {
if (!fetchToPos(address + size - 1)) return -1;
memcpy(buf, &Bytes[address + BytesSkipped], size);
if (copied) *copied = size;
return 0;
}
bool StreamingMemoryObject::dropLeadingBytes(size_t s) {
if (BytesRead < s) return true;
BytesSkipped = s;
BytesRead -= s;
return false;
}
void StreamingMemoryObject::setKnownObjectSize(size_t size) {
ObjectSize = size;
Bytes.reserve(size);
}
StreamableMemoryObject *getNonStreamedMemoryObject(
const unsigned char *Start, const unsigned char *End) {
return new RawMemoryObject(Start, End);
}
StreamableMemoryObject::~StreamableMemoryObject() { }
StreamingMemoryObject::StreamingMemoryObject(DataStreamer *streamer) :
Bytes(kChunkSize), Streamer(streamer), BytesRead(0), BytesSkipped(0),
ObjectSize(0), EOFReached(false) {
BytesRead = streamer->GetBytes(&Bytes[0], kChunkSize);
}
}
|
