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Generate suspend checks at the beginning of special methods.
If we need to call to runtime, go to the slow path where we
create a simplified but valid frame, spill all arguments,
call art_quick_test_suspend, restore necessary arguments and
return back to the fast path. This keeps the fast path
overhead to a minimum.
Bug: 19245639
Change-Id: I3de5aee783943941322a49c4cf2c4c94411dbaa2
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Redefine a back-edge to really mean an edge to a loop head
instead of comparing instruction offsets. Generate suspend
checks also on fall-through to a loop head; insert an extra
GOTO for these edges.
Add suspend checks to fused cmp instructions.
Rewrite suspend check elimination to track whether there is
an invoke on each path from the loop head to a given back
edge, instead of using domination info to look for a basic
block with invoke that must be on each path. Ignore invokes
to intrinsics and move the optimization to a its own pass.
The new loops in 109-suspend-check should prevent intrinsics
and fused cmp-related regressions.
Bug: 18522004
Change-Id: I96ac818f76ccf9419a6e70e9ec00555f9d487a9e
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Changed calls from System.gc to Runtime.getRuntime.gc where it was
necessary.
Required for:
https://android-review.googlesource.com/#/c/80253/
Change-Id: I2b0622585da54229a6248e95d40134b6d18598a9
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Art's Quick compiler currently uses a convervative mechanism
to ensure that a safe point will be reached within a "small" amount
of time. Explicit suspend checks are placed prior to backwards
branches and on returns. There are a lot of ways to optimize,
which we'll get to in the future, but for now the only optimization
is to detect a backwards branch that targets a return block. That's
a common pattern in dex, and simple to detect. In those cases, we can
suppress the suspend check on the backwards branch knowing that the
return will do it.
However, the notion of what is a backwards branch got a bit muddied
with some mir optimizations that transform the graph by changing the
sense of branches. What started off as a taken backwards branch may
turn into a fallthrough backwards branch.
This CL avoid the confusion by marking branches backwards based on
their original dex targets rather than using the post-transform test
of backwardness.
Change-Id: I9b30be168c801af51bae7f66ecd442edcb115a18
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