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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <cinttypes>
#include "wasm.hh"
auto get_export_memory(wasm::vec<wasm::Extern*>& exports, size_t i) -> wasm::Memory* {
if (exports.size() <= i || !exports[i]->memory()) {
std::cout << "> Error accessing memory export " << i << "!" << std::endl;
exit(1);
}
return exports[i]->memory();
}
auto get_export_func(const wasm::vec<wasm::Extern*>& exports, size_t i) -> const wasm::Func* {
if (exports.size() <= i || !exports[i]->func()) {
std::cout << "> Error accessing function export " << i << "!" << std::endl;
exit(1);
}
return exports[i]->func();
}
template<class T, class U>
void check(T actual, U expected) {
if (actual != expected) {
std::cout << "> Error on result, expected " << expected << ", got " << actual << std::endl;
exit(1);
}
}
template<class... Args>
void check_ok(const wasm::Func* func, Args... xs) {
wasm::Val args[] = {wasm::Val::i32(xs)...};
if (func->call(args)) {
std::cout << "> Error on result, expected return" << std::endl;
exit(1);
}
}
template<class... Args>
void check_trap(const wasm::Func* func, Args... xs) {
wasm::Val args[] = {wasm::Val::i32(xs)...};
if (! func->call(args)) {
std::cout << "> Error on result, expected trap" << std::endl;
exit(1);
}
}
template<class... Args>
auto call(const wasm::Func* func, Args... xs) -> int32_t {
wasm::Val args[] = {wasm::Val::i32(xs)...};
wasm::Val results[1];
if (func->call(args, results)) {
std::cout << "> Error on result, expected return" << std::endl;
exit(1);
}
return results[0].i32();
}
void run() {
// Initialize.
std::cout << "Initializing..." << std::endl;
auto engine = wasm::Engine::make();
auto store_ = wasm::Store::make(engine.get());
auto store = store_.get();
// Load binary.
std::cout << "Loading binary..." << std::endl;
std::ifstream file("memory.wasm");
file.seekg(0, std::ios_base::end);
auto file_size = file.tellg();
file.seekg(0);
auto binary = wasm::vec<byte_t>::make_uninitialized(file_size);
file.read(binary.get(), file_size);
file.close();
if (file.fail()) {
std::cout << "> Error loading module!" << std::endl;
return;
}
// Compile.
std::cout << "Compiling module..." << std::endl;
auto module = wasm::Module::make(store, binary);
if (!module) {
std::cout << "> Error compiling module!" << std::endl;
return;
}
// Instantiate.
std::cout << "Instantiating module..." << std::endl;
auto instance = wasm::Instance::make(store, module.get(), nullptr);
if (!instance) {
std::cout << "> Error instantiating module!" << std::endl;
return;
}
// Extract export.
std::cout << "Extracting exports..." << std::endl;
auto exports = instance->exports();
size_t i = 0;
auto memory = get_export_memory(exports, i++);
auto size_func = get_export_func(exports, i++);
auto load_func = get_export_func(exports, i++);
auto store_func = get_export_func(exports, i++);
// Check initial memory.
std::cout << "Checking memory..." << std::endl;
check(memory->size(), 2u);
check(memory->data_size(), 0x20000u);
check(memory->data()[0], 0);
check(memory->data()[0x1000], 1);
check(memory->data()[0x1003], 4);
check(call(size_func), 2);
check(call(load_func, 0), 0);
check(call(load_func, 0x1000), 1);
check(call(load_func, 0x1003), 4);
check(call(load_func, 0x1ffff), 0);
check_trap(load_func, 0x20000);
// Mutate memory.
std::cout << "Mutating memory..." << std::endl;
memory->data()[0x1003] = 5;
check_ok(store_func, 0x1002, 6);
check_trap(store_func, 0x20000, 0);
check(memory->data()[0x1002], 6);
check(memory->data()[0x1003], 5);
check(call(load_func, 0x1002), 6);
check(call(load_func, 0x1003), 5);
// Grow memory.
std::cout << "Growing memory..." << std::endl;
check(memory->grow(1), true);
check(memory->size(), 3u);
check(memory->data_size(), 0x30000u);
check(call(load_func, 0x20000), 0);
check_ok(store_func, 0x20000, 0);
check_trap(load_func, 0x30000);
check_trap(store_func, 0x30000, 0);
check(memory->grow(1), false);
check(memory->grow(0), true);
// Create stand-alone memory.
// TODO(wasm+): Once Wasm allows multiple memories, turn this into import.
std::cout << "Creating stand-alone memory..." << std::endl;
auto memorytype = wasm::MemoryType::make(wasm::Limits(5, 5));
auto memory2 = wasm::Memory::make(store, memorytype.get());
check(memory2->size(), 5u);
check(memory2->grow(1), false);
check(memory2->grow(0), true);
// Shut down.
std::cout << "Shutting down..." << std::endl;
}
int main(int argc, const char* argv[]) {
run();
std::cout << "Done." << std::endl;
return 0;
}
|
