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syscall: lower nowrite to inaccessiblememonly
In the origin implementation, the `nowrite` flag literally means not writing memory at all.
Due to the usage of flags on certain functions, it results in the same issues found in artiq-zynq after optimization passes. (M-Labs/artiq-zynq#119)
A fix wrote by @dnadlinger can resolve this issue. (c1e46cc7c8
)
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@ -84,14 +84,6 @@ class LLVMIRGenerator:
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self.llobject_map = {}
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self.phis = []
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self.empty_metadata = self.llmodule.add_metadata([])
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self.tbaa_tree = self.llmodule.add_metadata([
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ll.MetaDataString(self.llmodule, "ARTIQ TBAA")
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])
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self.tbaa_nowrite_call = self.llmodule.add_metadata([
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ll.MetaDataString(self.llmodule, "ref-only function call"),
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self.tbaa_tree,
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ll.Constant(lli64, 1)
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])
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self.quote_fail_msg = None
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def needs_sret(self, lltyp, may_be_large=True):
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@ -1207,6 +1199,8 @@ class LLVMIRGenerator:
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llfun.args[i].add_attribute('byval')
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if 'nounwind' in insn.target_function().type.flags:
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llfun.attributes.add('nounwind')
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if 'nowrite' in insn.target_function().type.flags:
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llfun.attributes.add('inaccessiblememonly')
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return llfun, list(llargs)
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@ -1364,11 +1358,6 @@ class LLVMIRGenerator:
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# {} elsewhere.
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llresult = ll.Constant(llunit, [])
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# Never add TBAA nowrite metadata to a functon with sret!
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# This leads to miscompilations.
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if types.is_external_function(functiontyp) and 'nowrite' in functiontyp.flags:
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llcall.set_metadata('tbaa', self.tbaa_nowrite_call)
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return llresult
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def process_Invoke(self, insn):
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@ -304,7 +304,7 @@ class TExternalFunction(TFunction):
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mangling rules).
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:ivar flags: (set of str) function flags.
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Flag ``nounwind`` means the function never raises an exception.
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Flag ``nowrite`` means the function never writes any memory
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Flag ``nowrite`` means the function never accesses any memory
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that the ARTIQ Python code can observe.
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:ivar broadcast_across_arrays: (bool)
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If True, the function is transparently applied element-wise when called
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@ -2,11 +2,11 @@ from artiq.language.core import *
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from artiq.language.types import *
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@syscall(flags={"nounwind", "nowrite"})
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@syscall(flags={"nounwind"})
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def cache_get(key: TStr) -> TList(TInt32):
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raise NotImplementedError("syscall not simulated")
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@syscall(flags={"nowrite"})
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@syscall
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def cache_put(key: TStr, value: TList(TInt32)) -> TNone:
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raise NotImplementedError("syscall not simulated")
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@ -4,9 +4,9 @@
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from artiq.language.core import *
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from artiq.language.types import *
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# CHECK: call void @foo\(\)(, !dbg !\d+)?, !tbaa !\d+
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# CHECK: call void @foo\(\)(, !dbg !\d+)?
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# CHECK-L: ; Function Attrs: nounwind
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# CHECK-L: ; Function Attrs: inaccessiblememonly nounwind
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# CHECK-NEXT-L: declare void @foo()
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@syscall(flags={"nounwind", "nowrite"})
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