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library_stack_trace.js
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81 lines (76 loc) · 2.31 KB
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/**
* @license
* Copyright 2019 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
var LibraryStackTrace = {
#if DEMANGLE_SUPPORT
$demangle__deps: ['$withStackSave', '__cxa_demangle', 'free', '$stringToUTF8OnStack'],
#endif
$demangle: (func) => {
#if DEMANGLE_SUPPORT
// If demangle has failed before, stop demangling any further function names
// This avoids an infinite recursion with malloc()->abort()->stackTrace()->demangle()->malloc()->...
demangle.recursionGuard = (demangle.recursionGuard|0)+1;
if (demangle.recursionGuard > 1) return func;
return withStackSave(() => {
try {
var s = func;
if (s.startsWith('__Z'))
s = s.substr(1);
var buf = stringToUTF8OnStack(s);
var status = stackAlloc(4);
var ret = ___cxa_demangle(buf, 0, 0, status);
if ({{{ makeGetValue('status', '0', 'i32') }}} === 0 && ret) {
return UTF8ToString(ret);
}
// otherwise, libcxxabi failed
} catch(e) {
} finally {
_free(ret);
if (demangle.recursionGuard < 2) --demangle.recursionGuard;
}
// failure when using libcxxabi, don't demangle
return func;
});
#else // DEMANGLE_SUPPORT
#if ASSERTIONS
warnOnce('warning: build with -sDEMANGLE_SUPPORT to link in libcxxabi demangling');
#endif // ASSERTIONS
return func;
#endif // DEMANGLE_SUPPORT
},
$demangleAll__deps: ['$demangle'],
$demangleAll: (text) => {
var regex =
/\b_Z[\w\d_]+/g;
return text.replace(regex,
function(x) {
var y = demangle(x);
return x === y ? x : (y + ' [' + x + ']');
});
},
$jsStackTrace: function() {
var error = new Error();
if (!error.stack) {
// IE10+ special cases: It does have callstack info, but it is only
// populated if an Error object is thrown, so try that as a special-case.
try {
throw new Error();
} catch(e) {
error = e;
}
if (!error.stack) {
return '(no stack trace available)';
}
}
return error.stack.toString();
},
$stackTrace__deps: ['$jsStackTrace', '$demangleAll'],
$stackTrace: function() {
var js = jsStackTrace();
if (Module['extraStackTrace']) js += '\n' + Module['extraStackTrace']();
return demangleAll(js);
}
}
addToLibrary(LibraryStackTrace);