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
|
// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/wasm/wasm-module-sourcemap.h"
#include <algorithm>
#include "include/v8-context.h"
#include "include/v8-json.h"
#include "include/v8-local-handle.h"
#include "include/v8-object.h"
#include "include/v8-primitive.h"
#include "src/api/api.h"
#include "src/base/vlq-base64.h"
namespace v8 {
class String;
namespace internal {
namespace wasm {
WasmModuleSourceMap::WasmModuleSourceMap(v8::Isolate* v8_isolate,
v8::Local<v8::String> src_map_str) {
v8::HandleScope scope(v8_isolate);
v8::Local<v8::Context> context = v8::Context::New(v8_isolate);
v8::Local<v8::Value> src_map_value;
if (!v8::JSON::Parse(context, src_map_str).ToLocal(&src_map_value)) return;
v8::Local<v8::Object> src_map_obj =
v8::Local<v8::Object>::Cast(src_map_value);
v8::Local<v8::Value> version_value, sources_value, mappings_value;
bool has_valid_version =
src_map_obj
->Get(context, v8::String::NewFromUtf8Literal(v8_isolate, "version"))
.ToLocal(&version_value) &&
version_value->IsUint32();
uint32_t version = 0;
if (!has_valid_version || !version_value->Uint32Value(context).To(&version) ||
version != 3u)
return;
bool has_valid_sources =
src_map_obj
->Get(context, v8::String::NewFromUtf8Literal(v8_isolate, "sources"))
.ToLocal(&sources_value) &&
sources_value->IsArray();
if (!has_valid_sources) return;
v8::Local<v8::Object> sources_arr =
v8::Local<v8::Object>::Cast(sources_value);
v8::Local<v8::Value> sources_len_value;
if (!sources_arr
->Get(context, v8::String::NewFromUtf8Literal(v8_isolate, "length"))
.ToLocal(&sources_len_value))
return;
uint32_t sources_len = 0;
if (!sources_len_value->Uint32Value(context).To(&sources_len)) return;
for (uint32_t i = 0; i < sources_len; ++i) {
v8::Local<v8::Value> file_name_value;
if (!sources_arr->Get(context, i).ToLocal(&file_name_value) ||
!file_name_value->IsString())
return;
v8::Local<v8::String> file_name =
v8::Local<v8::String>::Cast(file_name_value);
auto file_name_sz = file_name->Utf8Length(v8_isolate);
std::unique_ptr<char[]> file_name_buf(new char[file_name_sz + 1]);
file_name->WriteUtf8(v8_isolate, file_name_buf.get());
file_name_buf.get()[file_name_sz] = '\0';
filenames.emplace_back(file_name_buf.get());
}
bool has_valid_mappings =
src_map_obj
->Get(context, v8::String::NewFromUtf8Literal(v8_isolate, "mappings"))
.ToLocal(&mappings_value) &&
mappings_value->IsString();
if (!has_valid_mappings) return;
v8::Local<v8::String> mappings = v8::Local<v8::String>::Cast(mappings_value);
int mappings_sz = mappings->Utf8Length(v8_isolate);
std::unique_ptr<char[]> mappings_buf(new char[mappings_sz + 1]);
mappings->WriteUtf8(v8_isolate, mappings_buf.get());
mappings_buf.get()[mappings_sz] = '\0';
valid_ = DecodeMapping(mappings_buf.get());
}
size_t WasmModuleSourceMap::GetSourceLine(size_t wasm_offset) const {
std::vector<std::size_t>::const_iterator up =
std::upper_bound(offsets.begin(), offsets.end(), wasm_offset);
CHECK_NE(offsets.begin(), up);
size_t source_idx = up - offsets.begin() - 1;
return source_row[source_idx];
}
std::string WasmModuleSourceMap::GetFilename(size_t wasm_offset) const {
std::vector<size_t>::const_iterator up =
std::upper_bound(offsets.begin(), offsets.end(), wasm_offset);
CHECK_NE(offsets.begin(), up);
size_t offset_idx = up - offsets.begin() - 1;
size_t filename_idx = file_idxs[offset_idx];
return filenames[filename_idx];
}
bool WasmModuleSourceMap::HasSource(size_t start, size_t end) const {
return start <= *(offsets.end() - 1) && end > *offsets.begin();
}
bool WasmModuleSourceMap::HasValidEntry(size_t start, size_t addr) const {
std::vector<size_t>::const_iterator up =
std::upper_bound(offsets.begin(), offsets.end(), addr);
if (up == offsets.begin()) return false;
size_t offset_idx = up - offsets.begin() - 1;
size_t entry_offset = offsets[offset_idx];
if (entry_offset < start) return false;
return true;
}
bool WasmModuleSourceMap::DecodeMapping(const std::string& s) {
size_t pos = 0, gen_col = 0, file_idx = 0, ori_line = 0;
int32_t qnt = 0;
while (pos < s.size()) {
// Skip redundant commas.
if (s[pos] == ',') {
++pos;
continue;
}
if ((qnt = base::VLQBase64Decode(s.c_str(), s.size(), &pos)) ==
std::numeric_limits<int32_t>::min())
return false;
gen_col += qnt;
if ((qnt = base::VLQBase64Decode(s.c_str(), s.size(), &pos)) ==
std::numeric_limits<int32_t>::min())
return false;
file_idx += qnt;
if ((qnt = base::VLQBase64Decode(s.c_str(), s.size(), &pos)) ==
std::numeric_limits<int32_t>::min())
return false;
ori_line += qnt;
// Column number in source file is always 0 in source map generated by
// Emscripten. We just decode this value without further usage of it.
if ((qnt = base::VLQBase64Decode(s.c_str(), s.size(), &pos)) ==
std::numeric_limits<int32_t>::min())
return false;
if (pos < s.size() && s[pos] != ',') return false;
pos++;
file_idxs.push_back(file_idx);
source_row.push_back(ori_line);
offsets.push_back(gen_col);
}
return true;
}
} // namespace wasm
} // namespace internal
} // namespace v8
|
