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[ubsan-minimal] Add a path for non-POSIX (and bare-metal) use of the library 

Summary:
Hook on -DKERNEL_USE (which is also used in lib/builtins) to not import
strlen and not rely on write() being implemented with the stderr on fd 2.

With this, the only requirements to use this library are:
  - "Good enough" std::atomic<void*> and std::atomic<int>
  - abort() being implemented
  - ubsan_message(const char*) being implemented

Reviewers: eugenis

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39791

llvm-svn: 320831
This commit is contained in:
Filipe Cabecinhas 2017-12-15 17:30:50 +00:00
parent a16395008c
commit 237d4c2eab
1 changed files with 5 additions and 0 deletions
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5
compiler-rt/lib/ubsan_minimal/ubsan_minimal_handlers.cc
View File

@ -5,9 +5,14 @@
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#ifdef KERNEL_USE
extern "C" void ubsan_message(const char *msg);
static void message(const char *msg) { ubsan_message(msg); }
#else
static void message(const char *msg) { static void message(const char *msg) {
write(2, msg, strlen(msg)); write(2, msg, strlen(msg));
} }
#endif
static const int kMaxCallerPcs = 20; static const int kMaxCallerPcs = 20;
static __sanitizer::atomic_uintptr_t caller_pcs[kMaxCallerPcs]; static __sanitizer::atomic_uintptr_t caller_pcs[kMaxCallerPcs];