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[MemProf] Memory profiling runtime support

Authored by tejohnson on Sep 3 2020, 3:21 PM.

Description

[MemProf] Memory profiling runtime support

See RFC for background:
http://lists.llvm.org/pipermail/llvm-dev/2020-June/142744.html

Follow on companion to the clang/llvm instrumentation support in D85948
and committed earlier.

This patch adds the compiler-rt runtime support for the memory
profiling.

Note that much of this support was cloned from asan (and then greatly
simplified and renamed). For example the interactions with the
sanitizer_common allocators, error handling, interception, etc.

The bulk of the memory profiling specific code can be found in the
MemInfoBlock, MemInfoBlockCache, and related classes defined and used
in memprof_allocator.cpp.

For now, the memory profile is dumped to text (stderr by default, but
honors the sanitizer_common log_path flag). It is dumped in either a
default verbose format, or an optional terse format.

This patch also adds a set of tests for the core functionality.

Differential Revision: https://reviews.llvm.org/D87120

Details

Committed
tejohnsonFri, Oct 16, 9:47 AM
Differential Revision
D87120: [MemProf] Memory profiling runtime support
Parents
rG880fc4d581b0: [libc++] Move the oss-fuzz script to libcxx/utils/ci
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