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Stack Limit as an Argument Purpose (#372)

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* Initial approach.

* Move stack_limit check before opening the frame

* Account for GPRs and frame pointer in stack check

* Check stack_limit example.

* Remove stack_limit attribute code.

Amends #359

* fmt
This commit is contained in:
Sergey Pepyakin
2018-08-04 16:16:21 +03:00
committed by Dan Gohman
parent 217786e969
commit 9dbfbbde10
10 changed files with 91 additions and 75 deletions
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11
cranelift/docs/ir.rst
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@@ -546,17 +546,6 @@ instructions before instruction selection::
When Cranelift code is running in a sandbox, it can also be necessary to include
stack overflow checks in the prologue.
.. inst:: stack_limit = GV
Set the stack limit of the current function.
If set, in the preamble read the stack limit from ``GV`` and compare it to the stack pointer. If
the stack pointer has reached or exceeded the limit, generate a trap with a
``stk_ovf`` code.
Setting `stack_limit` is an alternative way to detect stack overflow, when using
a calling convention that doesn't perform stack probes.
Global values
-------------