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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
/* eslint camelcase: 0*/
"use strict";
const {
decodeExpr,
} = require("resource://devtools/client/shared/source-map-loader/wasm-dwarf/wasmDwarfExpressions");
const xScopes = new Map();
function indexLinkingNames(items) {
const result = new Map();
let queue = [...items];
while (queue.length) {
const item = queue.shift();
if ("uid" in item) {
result.set(item.uid, item);
} else if ("linkage_name" in item) {
// TODO the linkage_name string value is used for compatibility
// with old format. Remove in favour of the uid referencing.
result.set(item.linkage_name, item);
}
if ("children" in item) {
queue = [...queue, ...item.children];
}
}
return result;
}
function getIndexedItem(index, key) {
if (typeof key === "object" && key != null) {
return index.get(key.uid);
}
if (typeof key === "string") {
return index.get(key);
}
return null;
}
async function getXScopes(sourceId, getSourceMap) {
if (xScopes.has(sourceId)) {
return xScopes.get(sourceId);
}
const map = await getSourceMap(sourceId);
if (!map || !map.xScopes) {
xScopes.set(sourceId, null);
return null;
}
const { code_section_offset, debug_info } = map.xScopes;
const xScope = {
code_section_offset,
debug_info,
idIndex: indexLinkingNames(debug_info),
sources: map.sources,
};
xScopes.set(sourceId, xScope);
return xScope;
}
function isInRange(item, pc) {
if ("ranges" in item) {
return item.ranges.some(r => r[0] <= pc && pc < r[1]);
}
if ("high_pc" in item) {
return item.low_pc <= pc && pc < item.high_pc;
}
return false;
}
function decodeExprAt(expr, pc) {
if (typeof expr === "string") {
return decodeExpr(expr);
}
const foundAt = expr.find(i => i.range[0] <= pc && pc < i.range[1]);
return foundAt ? decodeExpr(foundAt.expr) : null;
}
function getVariables(scope, pc) {
const vars = scope.children
? scope.children.reduce((result, item) => {
switch (item.tag) {
case "variable":
case "formal_parameter":
result.push({
name: item.name || "",
expr: item.location ? decodeExprAt(item.location, pc) : null,
});
break;
case "lexical_block":
// FIXME build scope blocks (instead of combining)
const tmp = getVariables(item, pc);
result = [...tmp.vars, ...result];
break;
}
return result;
}, [])
: [];
const frameBase = scope.frame_base ? decodeExpr(scope.frame_base) : null;
return {
vars,
frameBase,
};
}
function filterScopes(items, pc, lastItem, index) {
if (!items) {
return [];
}
return items.reduce((result, item) => {
switch (item.tag) {
case "compile_unit":
if (isInRange(item, pc)) {
result = [
...result,
...filterScopes(item.children, pc, lastItem, index),
];
}
break;
case "namespace":
case "structure_type":
case "union_type":
result = [
...result,
...filterScopes(item.children, pc, lastItem, index),
];
break;
case "subprogram":
if (isInRange(item, pc)) {
const s = {
id: item.linkage_name,
name: item.name,
variables: getVariables(item, pc),
};
result = [...result, s, ...filterScopes(item.children, pc, s, index)];
}
break;
case "inlined_subroutine":
if (isInRange(item, pc)) {
const linkedItem = getIndexedItem(index, item.abstract_origin);
const s = {
id: item.abstract_origin,
name: linkedItem ? linkedItem.name : void 0,
variables: getVariables(item, pc),
};
if (lastItem) {
lastItem.file = item.call_file;
lastItem.line = item.call_line;
}
result = [...result, s, ...filterScopes(item.children, pc, s, index)];
}
break;
}
return result;
}, []);
}
class XScope {
xScope;
sourceMapContext;
constructor(xScopeData, sourceMapContext) {
this.xScope = xScopeData;
this.sourceMapContext = sourceMapContext;
}
search(generatedLocation) {
const { code_section_offset, debug_info, sources, idIndex } = this.xScope;
const pc = generatedLocation.line - (code_section_offset || 0);
const scopes = filterScopes(debug_info, pc, null, idIndex);
scopes.reverse();
return scopes.map(i => {
if (!("file" in i)) {
return {
displayName: i.name || "",
variables: i.variables,
};
}
const sourceId = this.sourceMapContext.generatedToOriginalId(
generatedLocation.sourceId,
sources[i.file || 0]
);
return {
displayName: i.name || "",
variables: i.variables,
location: {
line: i.line || 0,
sourceId,
},
};
});
}
}
async function getWasmXScopes(sourceId, sourceMapContext) {
const { getSourceMap } = sourceMapContext;
const xScopeData = await getXScopes(sourceId, getSourceMap);
if (!xScopeData) {
return null;
}
return new XScope(xScopeData, sourceMapContext);
}
function clearWasmXScopes() {
xScopes.clear();
}
module.exports = {
getWasmXScopes,
clearWasmXScopes,
};
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