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Update wasm_offset_converter. NFC #24588

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Merged
merged 1 commit into from
Jun 17, 2025
Merged

Update wasm_offset_converter. NFC #24588

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143 changes: 71 additions & 72 deletions src/source_map_support.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,96 +4,95 @@
* SPDX-License-Identifier: MIT
*/

/**
* @constructor
*/
function WasmSourceMap(sourceMap) {
this.version = sourceMap.version;
this.sources = sourceMap.sources;
this.names = sourceMap.names;
class WasmSourceMap {
mapping = {};
offsets = [];

this.mapping = {};
this.offsets = [];
constructor(sourceMap) {
this.version = sourceMap.version;
this.sources = sourceMap.sources;
this.names = sourceMap.names;

var vlqMap = {};
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split('').forEach((c, i) => vlqMap[c] = i);
var vlqMap = {};
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split('').forEach((c, i) => vlqMap[c] = i);

// based on https://github.com/Rich-Harris/vlq/blob/master/src/vlq.ts
function decodeVLQ(string) {
var result = [];
var shift = 0;
var value = 0;
// based on https://github.com/Rich-Harris/vlq/blob/master/src/vlq.ts
function decodeVLQ(string) {
var result = [];
var shift = 0;
var value = 0;

for (var i = 0; i < string.length; ++i) {
var integer = vlqMap[string[i]];
if (integer === undefined) {
throw new Error('Invalid character (' + string[i] + ')');
}
for (var ch of string) {
var integer = vlqMap[ch];
if (integer === undefined) {
throw new Error(`Invalid character (${ch})`);
}

value += (integer & 31) << shift;
value += (integer & 31) << shift;

if (integer & 32) {
shift += 5;
} else {
var negate = value & 1;
value >>= 1;
result.push(negate ? -value : value);
value = shift = 0;
if (integer & 32) {
shift += 5;
} else {
var negate = value & 1;
value >>= 1;
result.push(negate ? -value : value);
value = shift = 0;
}
}
return result;
}
return result;
}

var offset = 0, src = 0, line = 1, col = 1, name = 0;
sourceMap.mappings.split(',').forEach(function (segment, index) {
if (!segment) return;
var data = decodeVLQ(segment);
var info = {};
var offset = 0, src = 0, line = 1, col = 1, name = 0;
sourceMap.mappings.split(',').forEach(function (segment, index) {
if (!segment) return;
var data = decodeVLQ(segment);
var info = {};

offset += data[0];
if (data.length >= 2) info.source = src += data[1];
if (data.length >= 3) info.line = line += data[2];
if (data.length >= 4) info.column = col += data[3];
if (data.length >= 5) info.name = name += data[4];
this.mapping[offset] = info;
this.offsets.push(offset);
}, this);
this.offsets.sort((a, b) => a - b);
}
offset += data[0];
if (data.length >= 2) info.source = src += data[1];
if (data.length >= 3) info.line = line += data[2];
if (data.length >= 4) info.column = col += data[3];
if (data.length >= 5) info.name = name += data[4];
this.mapping[offset] = info;
this.offsets.push(offset);
}, this);
this.offsets.sort((a, b) => a - b);
}

WasmSourceMap.prototype.lookup = function (offset) {
var normalized = this.normalizeOffset(offset);
lookup(offset) {
var normalized = this.normalizeOffset(offset);
#if USE_OFFSET_CONVERTER
if (!wasmOffsetConverter.isSameFunc(offset, normalized)) {
return null;
}
if (!wasmOffsetConverter.isSameFunc(offset, normalized)) {
return null;
}
#endif
var info = this.mapping[normalized];
if (!info) {
return null;
var info = this.mapping[normalized];
if (!info) {
return null;
}
return {
file: this.sources[info.source],
line: info.line,
column: info.column,
name: this.names[info.name],
};
}
return {
file: this.sources[info.source],
line: info.line,
column: info.column,
name: this.names[info.name],
};
}

WasmSourceMap.prototype.normalizeOffset = function (offset) {
var lo = 0;
var hi = this.offsets.length;
var mid;
normalizeOffset(offset) {
var lo = 0;
var hi = this.offsets.length;
var mid;

while (lo < hi) {
mid = Math.floor((lo + hi) / 2);
if (this.offsets[mid] > offset) {
hi = mid;
} else {
lo = mid + 1;
while (lo < hi) {
mid = Math.floor((lo + hi) / 2);
if (this.offsets[mid] > offset) {
hi = mid;
} else {
lo = mid + 1;
}
}
return this.offsets[lo - 1];
}
return this.offsets[lo - 1];
}

var wasmSourceMapFile = '{{{ WASM_BINARY_FILE }}}.map';
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