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DanielKristofKissDanielKristofKiss
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[llvm][AArch64] Do not inline a function with different signing scheme. (#80642) (#82743)
f the signing scheme is different that maybe the functions assumes different behaviours and dangerous to inline them without analysing them. This should be a rare case.
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‎llvm/include/llvm/IR/Attributes.td

+21-7
Original file line numberDiff line numberDiff line change
@@ -339,14 +339,26 @@ def UseSampleProfile : StrBoolAttr<"use-sample-profile">;
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def DenormalFPMath : ComplexStrAttr<"denormal-fp-math", [FnAttr]>;
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def DenormalFPMathF32 : ComplexStrAttr<"denormal-fp-math-f32", [FnAttr]>;
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// Attribute compatiblity rules are generated to check the attribute of the
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// caller and callee and decide whether inlining should be allowed. CompatRule
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// and child classes are used for the rule generation. CompatRule takes only a
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// compare function which could be templated with the attribute type.
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// CompatRuleStrAttr takes the compare function and the string attribute for
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// checking compatibility for inline substitution.
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class CompatRule<string F> {
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// The name of the function called to check the attribute of the caller and
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// callee and decide whether inlining should be allowed. The function's
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// signature must match "bool(const Function&, const Function &)", where the
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// first parameter is the reference to the caller and the second parameter is
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// the reference to the callee. It must return false if the attributes of the
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// caller and callee are incompatible, and true otherwise.
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// The function's signature must match "bool(const Function&, const
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// Function&)", where the first parameter is the reference to the caller and
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// the second parameter is the reference to the callee. It must return false
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// if the attributes of the caller and callee are incompatible, and true
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// otherwise.
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string CompatFunc = F;
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string AttrName = "";
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}
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class CompatRuleStrAttr<string F, string Attr> : CompatRule<F> {
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// The checker function is extended with an third argument as the function
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// attribute string "bool(const Function&, const Function&, const StringRef&)".
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string AttrName = Attr;
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}
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def : CompatRule<"isEqual<SanitizeAddressAttr>">;
@@ -359,7 +371,9 @@ def : CompatRule<"isEqual<ShadowCallStackAttr>">;
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def : CompatRule<"isEqual<UseSampleProfileAttr>">;
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def : CompatRule<"isEqual<NoProfileAttr>">;
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def : CompatRule<"checkDenormMode">;
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def : CompatRuleStrAttr<"isEqual", "sign-return-address">;
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def : CompatRuleStrAttr<"isEqual", "sign-return-address-key">;
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def : CompatRuleStrAttr<"isEqual", "branch-protection-pauth-lr">;
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class MergeRule<string F> {
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// The name of the function called to merge the attributes of the caller and

‎llvm/lib/IR/Attributes.cpp

+5
Original file line numberDiff line numberDiff line change
@@ -2045,6 +2045,11 @@ static bool isEqual(const Function &Caller, const Function &Callee) {
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Callee.getFnAttribute(AttrClass::getKind());
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}
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static bool isEqual(const Function &Caller, const Function &Callee,
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const StringRef &AttrName) {
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return Caller.getFnAttribute(AttrName) == Callee.getFnAttribute(AttrName);
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}
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/// Compute the logical AND of the attributes of the caller and the
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/// callee.
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///

‎llvm/test/Transforms/Inline/inline-sign-return-address.ll

+104
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,104 @@
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; Check the inliner doesn't inline a function with different sign return address schemes.
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; RUN: opt < %s -passes=inline -S | FileCheck %s
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define internal void @foo_all() #0 {
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ret void
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}
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define internal void @foo_nonleaf() #1 {
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ret void
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}
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define internal void @foo_none() #2 {
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ret void
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}
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define internal void @foo_lr() #3 {
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ret void
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}
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define internal void @foo_bkey() #4 {
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ret void
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}
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define dso_local void @bar_all() #0 {
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; CHECK-LABEL: bar_all
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; CHECK-NOT: call void @foo_all()
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; CHECK-NEXT: call void @foo_nonleaf()
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; CHECK-NEXT: call void @foo_none()
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; CHECK-NEXT: call void @foo_lr()
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; CHECK-NEXT: call void @foo_bkey()
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call void @foo_all()
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call void @foo_nonleaf()
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call void @foo_none()
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call void @foo_lr()
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call void @foo_bkey()
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ret void
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}
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define dso_local void @bar_nonleaf() #1 {
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; CHECK-LABEL: bar_nonleaf
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; CHECK-NEXT: call void @foo_all()
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; CHECK-NOT: call void @foo_nonleaf()
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; CHECK-NEXT: call void @foo_none()
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; CHECK-NEXT: call void @foo_lr()
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; CHECK-NEXT: call void @foo_bkey()
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call void @foo_all()
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call void @foo_nonleaf()
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call void @foo_none()
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call void @foo_lr()
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call void @foo_bkey()
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ret void
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}
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define dso_local void @bar_none() #2 {
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; CHECK-LABEL: bar_none
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; CHECK-NEXT: call void @foo_all()
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; CHECK-NEXT: call void @foo_nonleaf()
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; CHECK-NOT: call void @foo_none()
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; CHECK-NEXT: call void @foo_lr()
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; CHECK-NEXT: call void @foo_bkey()
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call void @foo_all()
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call void @foo_nonleaf()
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call void @foo_none()
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call void @foo_lr()
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call void @foo_bkey()
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ret void
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}
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define dso_local void @bar_lr() #3 {
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; CHECK-LABEL: bar_lr
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; CHECK-NEXT: call void @foo_all()
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; CHECK-NEXT: call void @foo_nonleaf()
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; CHECK-NEXT: call void @foo_none()
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; CHECK-NOT: call void @foo_lr()
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; CHECK-NEXT: call void @foo_bkey()
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call void @foo_all()
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call void @foo_nonleaf()
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call void @foo_none()
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call void @foo_lr()
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call void @foo_bkey()
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ret void
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}
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define dso_local void @bar_bkey() #4 {
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; CHECK-LABEL: bar_bkey
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; CHECK-NEXT: call void @foo_all()
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; CHECK-NEXT: call void @foo_nonleaf()
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; CHECK-NEXT: call void @foo_none()
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; CHECK-NEXT: call void @foo_lr()
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; CHECK-NOT: call void @foo_bkey()
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call void @foo_all()
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call void @foo_nonleaf()
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call void @foo_none()
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call void @foo_lr()
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call void @foo_bkey()
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ret void
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}
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attributes #0 = { "branch-protection-pauth-lr"="false" "sign-return-address"="all" }
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attributes #1 = { "branch-protection-pauth-lr"="false" "sign-return-address"="non-leaf" }
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attributes #2 = { "branch-protection-pauth-lr"="false" "sign-return-address"="none" }
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attributes #3 = { "branch-protection-pauth-lr"="true" "sign-return-address"="non-leaf" }
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attributes #4 = { "branch-protection-pauth-lr"="true" "sign-return-address"="non-leaf" "sign-return-address-key"="b_key" }

‎llvm/utils/TableGen/Attributes.cpp

+5-1
Original file line numberDiff line numberDiff line change
@@ -87,7 +87,11 @@ void Attributes::emitFnAttrCompatCheck(raw_ostream &OS, bool IsStringAttr) {
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8888
for (auto *Rule : CompatRules) {
8989
StringRef FuncName = Rule->getValueAsString("CompatFunc");
90-
OS << " Ret &= " << FuncName << "(Caller, Callee);\n";
90+
OS << " Ret &= " << FuncName << "(Caller, Callee";
91+
StringRef AttrName = Rule->getValueAsString("AttrName");
92+
if (!AttrName.empty())
93+
OS << ", \"" << AttrName << "\"";
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OS << ");\n";
9195
}
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OS << "\n";

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