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| author | Russell Gallop <russell.gallop@sony.com> | 2020-09-10 16:40:49 +0100 |
|---|---|---|
| committer | Russell Gallop <russell.gallop@sony.com> | 2021-01-21 16:55:36 +0000 |
| commit | 693e73ac27c551f0a7a9bf68e30228d713d54591 (patch) | |
| tree | 5da91e4b99ffd1042577749baa195f10b888ee0b | |
| parent | d0067fb16085d0b6e4a12c466b5decc49ff52cd8 (diff) | |
| download | llvm-693e73ac27c551f0a7a9bf68e30228d713d54591.tar.gz | |
Hook in windows weak definition stuff (from sanitizer_common but changed to make it scudoesque.
| -rw-r--r-- | compiler-rt/lib/scudo/standalone/internal_defs.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/compiler-rt/lib/scudo/standalone/internal_defs.h b/compiler-rt/lib/scudo/standalone/internal_defs.h index 4e3f8e217910..73b65b633e67 100644 --- a/compiler-rt/lib/scudo/standalone/internal_defs.h +++ b/compiler-rt/lib/scudo/standalone/internal_defs.h @@ -39,6 +39,48 @@ #define HIDDEN __attribute__((visibility("hidden"))) +//--------------------------- WEAK FUNCTIONS ---------------------------------// +// When working with weak functions, to simplify the code and make it more +// portable, when possible define a default implementation using this macro: +// +// SCUDO_INTERFACE_WEAK_DEF(<return_type>, <name>, <parameter list>) +// +// For example: +// SCUDO_INTERFACE_WEAK_DEF(bool, compare, int a, int b) { return a > b; } +// +#if SCUDO_WINDOWS +#include "win_defs.h" +#define SCUDO_INTERFACE_WEAK_DEF(ReturnType, Name, ...) \ + WIN_WEAK_EXPORT_DEF(ReturnType, Name, __VA_ARGS__) +#else +#define SCUDO_INTERFACE_WEAK_DEF(ReturnType, Name, ...) \ + extern "C" SCUDO_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE ReturnType \ + Name(__VA_ARGS__) +#endif + +// SCUDO_SUPPORTS_WEAK_HOOKS means that we support real weak functions that +// will evaluate to a null pointer when not defined. +#ifndef SCUDO_SUPPORTS_WEAK_HOOKS +#if SCUDO_LINUX +#define SCUDO_SUPPORTS_WEAK_HOOKS 1 +#else +#define SCUDO_SUPPORTS_WEAK_HOOKS 0 +#endif +#endif // SCUDO_SUPPORTS_WEAK_HOOKS +// For some weak hooks that will be called very often and we want to avoid the +// overhead of executing the default implementation when it is not necessary, +// we can use the flag SANITIZER_SUPPORTS_WEAK_HOOKS to only define the default +// implementation for platforms that doesn't support weak symbols. For example: +// +// #if !SANITIZER_SUPPORT_WEAK_HOOKS +// SANITIZER_INTERFACE_WEAK_DEF(bool, compare_hook, int a, int b) { +// return a > b; +// } +// #endif +// +// And then use it as: if (compare_hook) compare_hook(a, b); +//----------------------------------------------------------------------------// + #if SCUDO_WINDOWS #define WEAK #else |