diff options
author | Marcos Pividori <mpividori@google.com> | 2017-02-02 23:02:15 +0000 |
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committer | Marcos Pividori <mpividori@google.com> | 2017-02-02 23:02:15 +0000 |
commit | 23e6a85eed9eee8638c0f0a51f174ebbc435931e (patch) | |
tree | dcada2bfb8daadcc21bebe5ca0842f029499f523 /lib/sanitizer_common/sanitizer_coverage_win_sections.cc | |
parent | 753739845908eef985f4b0b5c2c15a46646a8018 (diff) |
[sancov] Define delimiters for sanitizer coverage's binary section on Windows.
On Windows, the symbols "___stop___sancov_guards" and "___start___sancov_guards"
are not defined automatically. So, we need to take a different approach.
We define 3 sections: ".SCOV$A", ".SCOV$M" and ".SCOV$Z".
Section ".SCOV$A" will only hold a variable ___start___sancov_guard.
Section ".SCOV$M" will hold the main data.
Section ".SCOV$Z" will only hold a variable ___stop___sancov_guards.
When linking, they will be merged sorted by the characters after the $, so we
can use the pointers of the variables ___[start|stop]___sancov_guard to know the
actual range of addresses of that section.
___[start|stop]___sancov_guard should be defined only once per module. On
Windows, we have 2 different cases:
+ When considering a shared runtime:
All the modules, main executable and dlls, are linked to an auxiliary static
library dynamic_runtime_thunk.lib. Because of that, we include the delimiters
in `SancovDynamicRuntimeThunk`.
+ When considering a static runtime:
The main executable in linked to the static runtime library.
All the dlls are linked to an auxiliary static library dll_thunk.
Because of that, we include the delimiter to both `SancovDllThunk` and
`SANITIZER_LIBCDEP_SOURCES` (which is included in the static runtime lib).
Differential Revision: https://reviews.llvm.org/D28435
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@293959 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/sanitizer_common/sanitizer_coverage_win_sections.cc')
-rw-r--r-- | lib/sanitizer_common/sanitizer_coverage_win_sections.cc | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_coverage_win_sections.cc b/lib/sanitizer_common/sanitizer_coverage_win_sections.cc new file mode 100644 index 000000000..4b0bbf1ed --- /dev/null +++ b/lib/sanitizer_common/sanitizer_coverage_win_sections.cc @@ -0,0 +1,22 @@ +//===-- sanitizer_coverage_win_sections.cc --------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file defines delimiters for Sanitizer Coverage's section. +//===----------------------------------------------------------------------===// + +#include "sanitizer_platform.h" +#if SANITIZER_WINDOWS +#include <stdint.h> +#pragma section(".SCOV$A", read, write) // NOLINT +#pragma section(".SCOV$Z", read, write) // NOLINT +extern "C" { +__declspec(allocate(".SCOV$A")) uint32_t __start___sancov_guards = 0; +__declspec(allocate(".SCOV$Z")) uint32_t __stop___sancov_guards = 0; +} +#endif // SANITIZER_WINDOWS |