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# e17b658f 21-Oct-2019 Evgeniy Stepanov <[email protected]>

[hwasan] Workaround unwinder issues in try-catch test.

Android links the unwinder library to every DSO. The problem is,
unwinder has global state, and hwasan implementation of personality
function w

[hwasan] Workaround unwinder issues in try-catch test.

Android links the unwinder library to every DSO. The problem is,
unwinder has global state, and hwasan implementation of personality
function wrapper happens to rub it the wrong way.

Switch the test to static libc++ as a temporary workaround.

llvm-svn: 375471

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Revision tags: llvmorg-9.0.0, llvmorg-9.0.0-rc6, llvmorg-9.0.0-rc5, llvmorg-9.0.0-rc4, llvmorg-9.0.0-rc3
# 21a18144 23-Aug-2019 Peter Collingbourne <[email protected]>

hwasan: Untag unwound stack frames by wrapping personality functions.

One problem with untagging memory in landing pads is that it only works
correctly if the function that catches the exception is

hwasan: Untag unwound stack frames by wrapping personality functions.

One problem with untagging memory in landing pads is that it only works
correctly if the function that catches the exception is instrumented.
If the function is uninstrumented, we have no opportunity to untag the
memory.

To address this, replace landing pad instrumentation with personality function
wrapping. Each function with an instrumented stack has its personality function
replaced with a wrapper provided by the runtime. Functions that did not have
a personality function to begin with also get wrappers if they may be unwound
past. As the unwinder calls personality functions during stack unwinding,
the original personality function is called and the function's stack frame is
untagged by the wrapper if the personality function instructs the unwinder
to keep unwinding. If unwinding stops at a landing pad, the function is
still responsible for untagging its stack frame if it resumes unwinding.

The old landing pad mechanism is preserved for compatibility with old runtimes.

Differential Revision: https://reviews.llvm.org/D66377

llvm-svn: 369721

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Revision tags: llvmorg-9.0.0-rc2
# f9e0df07 05-Aug-2019 Nico Weber <[email protected]>

compiler-rt: Rename .cc file in test/hwasan to .cpp

Like r367463, but for test/hwasan.

llvm-svn: 367849