[XRay] [compiler-rt] Allow logging the first argument of a function call.
Summary:
Functions with the LOG_ARGS_ENTRY sled kind at their beginning will be handled
in a way to (optionally) pass their first call argument to your logging handler.
For practical and performance reasons, only the first argument is supported, and
only up to 64 bits.
Reviewers: javed.absar, dberris
Reviewed By: dberris
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D29703
llvm-svn: 297000
diff --git a/compiler-rt/lib/xray/xray_arm.cc b/compiler-rt/lib/xray/xray_arm.cc
index fb78eb6..26d673e 100644
--- a/compiler-rt/lib/xray/xray_arm.cc
+++ b/compiler-rt/lib/xray/xray_arm.cc
@@ -128,8 +128,9 @@
}
bool patchFunctionEntry(const bool Enable, const uint32_t FuncId,
- const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
- return patchSled(Enable, FuncId, Sled, __xray_FunctionEntry);
+ const XRaySledEntry &Sled,
+ void (*Trampoline)()) XRAY_NEVER_INSTRUMENT {
+ return patchSled(Enable, FuncId, Sled, Trampoline);
}
bool patchFunctionExit(const bool Enable, const uint32_t FuncId,
@@ -146,3 +147,7 @@
bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
} // namespace __xray
+
+extern "C" void __xray_ArgLoggerEntry() XRAY_NEVER_INSTRUMENT {
+ // FIXME: this will have to be implemented in the trampoline assembly file
+}