[PATCH] D36839: [SanitizerCoverage] Add stack depth tracing instrumentation.

[Matt Morehouse via Phabricator via cfe-commits]

morehouse created this revision.
Herald added subscribers: hiraditya, kubamracek.

Augment SanitizerCoverage to insert maximum stack depth tracing for
use by libFuzzer.  The new instrumentation is enabled by the flag
-fsanitize-coverage=stack-depth and is compatible with the existing
trace-pc-guard coverage.  The user must also declare the following
global variable in their code:

  thread_local uintptr_t __sanitizer_cov_lowest_stack


https://reviews.llvm.org/D36839

Files:
  clang/include/clang/Driver/CC1Options.td
  clang/include/clang/Frontend/CodeGenOptions.def
  clang/lib/CodeGen/BackendUtil.cpp
  clang/lib/Driver/SanitizerArgs.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  compiler-rt/test/sanitizer_common/TestCases/sanitizer_coverage_stack_depth.cc
  llvm/include/llvm/Transforms/Instrumentation.h
  llvm/lib/Fuzzer/FuzzerTracePC.cpp
  llvm/lib/Fuzzer/FuzzerTracePC.h
  llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
  llvm/test/Instrumentation/SanitizerCoverage/stack-depth.ll

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