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/*
* Copyright 2024 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "source-map.h"
#include "support/colors.h"
namespace wasm {
std::vector<char> defaultEmptySourceMap;
void MapParseException::dump(std::ostream& o) const {
Colors::magenta(o);
o << "[";
Colors::red(o);
o << "map parse exception: ";
Colors::green(o);
o << text;
Colors::magenta(o);
o << "]";
Colors::normal(o);
}
void SourceMapReader::readHeader(Module& wasm) {
assert(pos == 0);
if (buffer.empty()) {
return;
}
auto skipWhitespace = [&]() {
while (pos < buffer.size() && (buffer[pos] == ' ' || buffer[pos] == '\n')) {
++pos;
}
};
auto findField = [&](const char* name) {
bool matching = false;
size_t len = strlen(name);
size_t index = 0;
while (1) {
char ch = get();
if (ch == '\"') {
if (matching) {
if (index == len) {
// We matched a terminating quote.
break;
}
matching = false;
} else {
// Beginning of a new potential match.
matching = true;
index = 0;
}
} else if (matching && name[index] == ch) {
++index;
} else if (matching) {
matching = false;
}
}
skipWhitespace();
expect(':');
skipWhitespace();
return true;
};
auto readString = [&](std::string& str) {
std::vector<char> vec;
skipWhitespace();
expect('\"');
while (1) {
if (maybeGet('\"')) {
break;
}
vec.push_back(get());
}
skipWhitespace();
str = std::string(vec.begin(), vec.end());
};
if (!findField("sources")) {
throw MapParseException("cannot find the 'sources' field in map");
}
skipWhitespace();
expect('[');
if (!maybeGet(']')) {
do {
std::string file;
readString(file);
wasm.debugInfoFileNames.push_back(file);
} while (maybeGet(','));
expect(']');
}
if (findField("names")) {
skipWhitespace();
expect('[');
if (!maybeGet(']')) {
do {
std::string symbol;
readString(symbol);
wasm.debugInfoSymbolNames.push_back(symbol);
} while (maybeGet(','));
expect(']');
}
}
if (!findField("mappings")) {
throw MapParseException("cannot find the 'mappings' field in map");
}
expect('\"');
if (maybeGet('\"')) {
// There are no mappings.
location = 0;
return;
}
// Read the location of the first debug location.
location = readBase64VLQ();
}
std::optional<Function::DebugLocation>
SourceMapReader::readDebugLocationAt(size_t currLocation) {
if (pos >= buffer.size()) {
return std::nullopt;
}
while (location && location <= currLocation) {
do {
char next = peek();
if (next == ',' || next == '\"') {
// This is a 1-length entry, so the next location has no debug info.
hasInfo = false;
break;
}
hasInfo = true;
file += readBase64VLQ();
line += readBase64VLQ();
col += readBase64VLQ();
next = peek();
if (next == ',' || next == '\"') {
hasSymbol = false;
break;
}
hasSymbol = true;
symbol += readBase64VLQ();
} while (false);
// Check whether there is another record to read the position for.
char next = get();
if (next == '\"') {
// End of records.
location = 0;
break;
}
if (next != ',') {
throw MapParseException("Expected delimiter");
}
// Set up for the next record.
location += readBase64VLQ();
}
if (!hasInfo) {
return std::nullopt;
}
auto sym = hasSymbol ? symbol : std::optional<uint32_t>{};
return Function::DebugLocation{file, line, col, sym};
}
int32_t SourceMapReader::readBase64VLQ() {
uint32_t value = 0;
uint32_t shift = 0;
while (1) {
auto ch = get();
if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch < 'g')) {
// last number digit
uint32_t digit = ch < 'a' ? ch - 'A' : ch - 'a' + 26;
value |= digit << shift;
break;
}
if (!(ch >= 'g' && ch <= 'z') && !(ch >= '0' && ch <= '9') && ch != '+' &&
ch != '/') {
throw MapParseException("invalid VLQ digit");
}
uint32_t digit =
ch > '9' ? ch - 'g' : (ch >= '0' ? ch - '0' + 20 : (ch == '+' ? 30 : 31));
value |= digit << shift;
shift += 5;
}
return value & 1 ? -int32_t(value >> 1) : int32_t(value >> 1);
}
} // namespace wasm
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