derek.holloway
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79 lines
3.2 KiB
LLVM
79 lines
3.2 KiB
LLVM
; This testcase is for testing the positive return values of the
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; TOCRestoreNeededForCallToImplementation query, specifically the type of
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; functions that are considered DSO local on AIX.
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; REQUIRES: asserts
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; RUN: llc < %s -mtriple=powerpc64-ibm-aix-xcoff --function-sections -filetype=obj -o /dev/null -debug-only=asmprinter 2>&1 | FileCheck %s
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; RUN: llc < %s -mtriple=powerpc-ibm-aix-xcoff --function-sections -filetype=obj -o /dev/null -debug-only=asmprinter 2>&1 | FileCheck %s
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; RUN: llc < %s -mtriple=powerpc64-ibm-aix-xcoff -ifunc-local-if-proven=1 -o /dev/null -debug-only=asmprinter 2>&1 | FileCheck %s
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; CHECK: foo_ext_hidden_decl is dso_local
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; CHECK: foo_ext_hidden_def is dso_local
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; CHECK: foo_ext_hidden_weak_def is dso_local
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; CHECK: foo_ext_protected_decl is dso_local
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; CHECK: foo_ext_protected_def is dso_local
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; CHECK: foo_ext_protected_weak_def is dso_local
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; CHECK: foo_static is dso_local
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; The following decls/defs are dso_local in the IR, and it matches the behaviour on AIX in practice
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; (1) a hidden/protected declaration should have a matching definition in the same shared object,
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; with the matching visibility. So the definition is not interposable due to hidden/protected.
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; (2) a hidden/protected definition is not interposable.
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; (3) attribute weak has no effect on interposition, and if a strong definition in the same shared object
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; exists, then it's a user error to have that definition have conflicting visibility.
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; In practice, on AIX the linker will silently pick the strong definition and keep it's visibility
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; ignoring what's on the weak definition.
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; On Linux, both ld and lld pick the strong definition but give it the most restrictive visibility based
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; on the candidates available (so a weak hidden and a strong default will yield a hidden strong)
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;
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declare hidden void @foo_ext_hidden_decl(...) ; (1)
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declare protected void @foo_ext_protected_decl(...) ; (1)
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define hidden void @foo_ext_hidden_def() { ; (2)
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entry:
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ret void
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}
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define protected void @foo_ext_protected_def() { ; (2)
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entry:
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ret void
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}
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define weak hidden void @foo_ext_hidden_weak_def() { ; (3)
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entry:
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ret void
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}
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define weak protected void @foo_ext_protected_weak_def() { ; (3)
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entry:
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ret void
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}
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define internal void @foo_static() {
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entry:
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ret void
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}
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@foo = ifunc void (...), ptr @resolve_foo
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@x = global i32 0, align 4
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@switch.table.bar = private unnamed_addr constant [6 x ptr] [ptr @foo_ext_hidden_decl, ptr @foo_ext_hidden_def, ptr @foo_ext_hidden_weak_def, ptr @foo_ext_protected_decl, ptr @foo_ext_protected_def, ptr @foo_ext_protected_weak_def], align 4
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define internal nonnull ptr @resolve_foo() {
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entry:
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%x = load i32, ptr @x, align 4
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%0 = icmp ult i32 %x, 6
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br i1 %0, label %switch.lookup, label %return
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switch.lookup: ; preds = %entry
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%switch.gep = getelementptr inbounds nuw ptr, ptr @switch.table.bar, i32 %x
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%switch.load = load ptr, ptr %switch.gep, align 4
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br label %return
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return: ; preds = %entry, %switch.lookup
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%retval.0 = phi ptr [ %switch.load, %switch.lookup ], [ @foo_static, %entry ]
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ret ptr %retval.0
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}
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