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/* import-globals-from head_crashreporter.js */
let gTestCrasherSyms = null;
let gModules = null;
// Returns the offset (int) of an IP with a given base address.
// This is effectively (ip - base), except a bit more complication due to
// Javascript's shaky handling of 64-bit integers.
// base & ip are passed as hex strings.
function getModuleOffset(base, ip) {
let i = 0;
// Find where the two addresses diverge, which enables us to perform a 32-bit
// subtraction.
// e.g. "0x1111111111112222"
// - "0x1111111111111111"
// becomes 2222 - 1111
for (; i < base.length; ++i) {
if (base[i] != ip[i]) {
break;
}
}
if (i == base.length) {
return 0;
}
let lhs2 = "0x" + base.substring(i);
let rhs2 = "0x" + ip.substring(i);
return parseInt(rhs2) - parseInt(lhs2);
}
// Uses gTestCrasherSyms to convert an address to a symbol.
function findNearestTestCrasherSymbol(addr) {
addr += 1; // Breakpad sometimes offsets addresses; correct for this.
let closestDistance = null;
let closestSym = null;
for (let sym in gTestCrasherSyms) {
if (addr >= gTestCrasherSyms[sym]) {
let thisDistance = addr - gTestCrasherSyms[sym];
if (closestDistance === null || thisDistance < closestDistance) {
closestDistance = thisDistance;
closestSym = sym;
}
}
}
if (closestSym === null) {
return null;
}
return { symbol: closestSym, offset: closestDistance };
}
// Populate known symbols for testcrasher.dll.
// Use the same prop names as from CrashTestUtils to avoid the need for mapping.
function initTestCrasherSymbols() {
gTestCrasherSyms = {};
for (let k in CrashTestUtils) {
// Not all keys here are valid symbol names. getWin64CFITestFnAddrOffset
// will return 0 in those cases, no need to filter here.
if (Number.isInteger(CrashTestUtils[k])) {
let t = CrashTestUtils.getWin64CFITestFnAddrOffset(CrashTestUtils[k]);
if (t > 0) {
gTestCrasherSyms[k] = t;
}
}
}
}
function stackFrameToString(frameIndex, frame) {
// Calculate the module offset.
let ip = frame.ip;
let symbol = "";
let moduleOffset = "unknown_offset";
let filename = "unknown_module";
if (
typeof frame.module_index !== "undefined" &&
frame.module_index >= 0 &&
frame.module_index < gModules.length
) {
let base = gModules[frame.module_index].base_addr;
moduleOffset = getModuleOffset(base, ip);
filename = gModules[frame.module_index].filename;
if (filename === "testcrasher.dll") {
let nearestSym = findNearestTestCrasherSymbol(moduleOffset);
if (nearestSym !== null) {
symbol = nearestSym.symbol + "+" + nearestSym.offset.toString(16);
}
}
}
let ret =
"frames[" +
frameIndex +
"] ip=" +
ip +
" " +
symbol +
", module:" +
filename +
", trust:" +
frame.trust +
", moduleOffset:" +
moduleOffset.toString(16);
return ret;
}
function dumpStackFrames(frames, maxFrames) {
for (let i = 0; i < Math.min(maxFrames, frames.length); ++i) {
info(stackFrameToString(i, frames[i]));
}
}
// Test that the top of the given stack (from extra data) matches the given
// expected frames.
//
// expected is { symbol: "", trust: "" }
function assertStack(stack, expected) {
for (let i = 0; i < stack.length; ++i) {
if (i >= expected.length) {
ok("Top stack frames were expected");
return;
}
let frame = stack[i];
let expectedFrame = expected[i];
let dumpThisFrame = function () {
info(" Actual frame: " + stackFrameToString(i, frame));
info(
"Expected { symbol: " +
expectedFrame.symbol +
", trust: " +
expectedFrame.trust +
"}"
);
};
if (expectedFrame.trust) {
if (expectedFrame.trust.startsWith("!")) {
// A "!" prefix on the frame trust matching is a logical "not".
if (frame.trust === expectedFrame.trust.substring(1)) {
dumpThisFrame();
info("Expected frame trust matched when it should not have.");
ok(false);
}
} else if (frame.trust !== expectedFrame.trust) {
dumpThisFrame();
info("Expected frame trust did not match.");
ok(false);
}
}
if (expectedFrame.symbol) {
if (typeof frame.module_index === "undefined") {
// Without a module_index, it happened in an unknown module. Currently
// you can't specify an expected "unknown" module.
info("Unknown symbol in unknown module.");
ok(false);
}
if (frame.module_index < 0 || frame.module_index >= gModules.length) {
dumpThisFrame();
info("Unknown module.");
ok(false);
return;
}
let base = gModules[frame.module_index].base_addr;
let moduleOffset = getModuleOffset(base, frame.ip);
let filename = gModules[frame.module_index].filename;
if (filename == "testcrasher.dll") {
let nearestSym = findNearestTestCrasherSymbol(moduleOffset);
if (nearestSym === null) {
dumpThisFrame();
info("Unknown symbol.");
ok(false);
return;
}
if (nearestSym.symbol !== expectedFrame.symbol) {
dumpThisFrame();
info("Mismatching symbol.");
ok(false);
}
}
}
}
}
// Performs a crash, runs minidump-analyzer, and checks expected stack analysis.
//
// how: The crash to perform. Constants defined in both CrashTestUtils.jsm
// and nsTestCrasher.cpp (i.e. CRASH_X64CFI_PUSH_NONVOL)
// expectedStack: An array of {"symbol", "trust"} where trust is "cfi",
// "context", "scan", et al. May be null if you don't need to check the stack.
// minidumpAnalyzerArgs: An array of additional arguments to pass to
// minidump-analyzer.exe.
async function do_x64CFITest(how, expectedStack, minidumpAnalyzerArgs) {
// Setup is run in the subprocess so we cannot use any closures.
let setupFn = "crashType = CrashTestUtils." + how + ";";
let callbackFn = async function (minidumpFile, extra, extraFile) {
runMinidumpAnalyzer(minidumpFile, minidumpAnalyzerArgs);
// Refresh updated extra data
extra = await IOUtils.readJSON(extraFile.path);
initTestCrasherSymbols();
let stackTraces = extra.StackTraces;
let crashingThreadIndex = stackTraces.crash_info.crashing_thread;
gModules = stackTraces.modules;
let crashingFrames = stackTraces.threads[crashingThreadIndex].frames;
dumpStackFrames(crashingFrames, 10);
assertStack(crashingFrames, expectedStack);
};
do_crash(setupFn, callbackFn, true, true);
}
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