Author: David Schneider <[email protected]>
Branch: jitframe-on-heap
Changeset: r61536:affdcf6df46c
Date: 2013-02-21 14:25 +0100
http://bitbucket.org/pypy/pypy/changeset/affdcf6df46c/
Log: port changes to storing and restoring exception info
diff --git a/rpython/jit/backend/arm/assembler.py
b/rpython/jit/backend/arm/assembler.py
--- a/rpython/jit/backend/arm/assembler.py
+++ b/rpython/jit/backend/arm/assembler.py
@@ -200,12 +200,28 @@
rawstart = mc.materialize(self.cpu.asmmemmgr, [])
self.propagate_exception_path = rawstart
- def _store_and_reset_exception(self, mc, resloc):
- assert resloc is not r.ip
- tmpreg = r.lr # use lr as a second temporary reg
+ def _store_and_reset_exception(self, mc, excvalloc=None, exctploc=None,
+
on_frame=False):
+ """ Resest the exception. If excvalloc is None, then store it on the
+ frame in jf_guard_exc
+ """
+ assert excvalloc is not r.ip
+ assert exctploc is not r.ip
+ tmpreg = r.lr
mc.gen_load_int(r.ip.value, self.cpu.pos_exc_value())
- if resloc is not None: # store
- self.load_reg(mc, resloc, r.ip, 0)
+ if excvalloc is not None: # store
+ assert excvalloc.is_reg()
+ self.load_reg(mc, excvalloc, r.ip)
+ if on_frame:
+ # store exc_value in JITFRAME
+ ofs = self.cpu.get_ofs_of_frame_field('jf_guard_exc')
+ assert check_imm_arg(ofs)
+ self.store_reg(mc, r.ip, r.fp, ofs)
+ if exctploc is not None:
+ # store pos_exception in exctploc
+ assert exctploc.is_reg()
+ mc.gen_load_int(r.ip.value, self.cpu.pos_exception())
+ self.load_reg(mc, exctploc, r.ip)
# reset exception
mc.gen_load_int(tmpreg.value, 0)
@@ -215,6 +231,23 @@
mc.gen_load_int(r.ip.value, self.cpu.pos_exception())
self.store_reg(mc, tmpreg, r.ip, 0)
+ def _restore_exception(self, mc, excvalloc, exctploc):
+ assert excvalloc is not r.ip
+ assert exctploc is not r.ip
+ tmpreg = r.lr # use lr as a second temporary reg
+ mc.gen_load_int(r.ip.value, self.cpu.pos_exc_value())
+ if excvalloc is not None:
+ assert excvalloc.is_reg()
+ self.store_reg(mc, excvalloc, r.ip)
+ else:
+ # load exc_value from JITFRAME and put it in pos_exc_value
+ ofs = self.cpu.get_ofs_of_frame_field('jf_guard_exc')
+ self.load_reg(mc, tmpreg, r.fp, ofs)
+ self.store_reg(mc, tmpreg, r.ip)
+
+ mc.gen_load_int(r.ip.value, self.cpu.pos_exception())
+ self.store_reg(mc, exctploc, r.ip)
+
def _build_stack_check_slowpath(self):
_, _, slowpathaddr = self.cpu.insert_stack_check()
if slowpathaddr == 0 or not self.cpu.propagate_exception_descr:
@@ -742,11 +775,20 @@
# set first arg, which is the old jitframe address
mc.MOV_rr(r.r0.value, r.fp.value)
+
+ # store a possibly present exception
+ # we use a callee saved reg here as a tmp for the exc.
+ self._store_and_reset_exception(mc, None, r.fp, on_frame=True)
+
# call realloc_frame, it takes two arguments
# arg0: the old jitframe
# arg1: the new size
#
mc.BL(self.cpu.realloc_frame)
+
+ # restore a possibly present exception
+ self._restore_exception(mc, None, r.fp)
+
# set fp to the new jitframe
mc.MOV_rr(r.fp.value, r.r0.value)
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