New macro throw_from_jato_func() allows signalled exception to be
thrown from jato C function that is directly called from JIT code. It
uses return address substitution method. It does not require any
polling-code to be inserted in JIT code. It can throw exceptions much
faster than using guard-page method because it does not involve
signals.
It should be used whenever possible instead of guard-page polling.
However the latter method will be still useful for polling for
asynchronous exceptions.
Signed-off-by: Tomek Grabiec <tgrab...@gmail.com>
---
include/jit/exception.h | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/include/jit/exception.h b/include/jit/exception.h
index 42bc2bb..71d1f3a 100644
--- a/include/jit/exception.h
+++ b/include/jit/exception.h
@@ -1,7 +1,11 @@
#ifndef JATO_JIT_EXCEPTION_H
#define JATO_JIT_EXCEPTION_H
+#include <arch/stack-frame.h>
+#include <jit/cu-mapping.h>
+#include <jit/compiler.h>
#include <stdbool.h>
+#include <vm/die.h>
#include <vm/vm.h>
struct compilation_unit;
@@ -55,4 +59,36 @@ static inline struct object *exception_occurred(void)
return exception_holder;
}
+/**
+ * Use this macro to throw signalled exception from jato functions
+ * that are directly called from JIT code. It replaces the function's
+ * return address so that it points to propper exception handler and
+ * removes call arguments from stack. The calling function can
+ * continue to execute safely as long as it's not trying to access
+ * call arguments.
+ *
+ * @args_size: the size of arguments pushed before call expressed in
+ * byte units.
+ */
+#define throw_from_jato_func(args_size)
\
+({ \
+ struct jit_stack_frame *frame; \
+ struct compilation_unit *cu; \
+ unsigned char *native_ptr; \
+ void *eh; \
+ \
+ native_ptr = __builtin_return_address(0) - 1; \
+ if (!is_jit_method((unsigned long)native_ptr)) \
+ die("%s: must not be called from not-JIT code", \
+ __func__); \
+ \
+ frame = __builtin_frame_address(1); \
+ \
+ cu = get_cu_from_native_addr((unsigned long)native_ptr); \
+ eh = throw_exception_from(cu, frame, native_ptr); \
+ \
+ __override_return_address(eh); \
+ __cleanup_args(args_size); \
+})
+
#endif /* JATO_JIT_EXCEPTION_H */
--
1.6.0.6
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