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[TargetLowering] Only inspect attributes in the arguments for ArgListEntry

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Parameter attributes are considered part of the function [1], and like
mismatched calling conventions [2], we can't have the verifier check for
mismatched parameter attributes.

Issues can be diagnosed with D103412.

[1] https://llvm.org/docs/LangRef.html#parameter-attributes
[2] https://llvm.org/docs/FAQ.html#why-does-instcombine-simplifycfg-turn-a-call-to-a-function-with-a-mismatched-calling-convention-into-unreachable-why-not-make-the-verifier-reject-it

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D101806
This commit is contained in:
Arthur Eubanks 2021-05-31 09:37:11 -07:00
parent cf3b931893
commit b01ec7e228
3 changed files with 70 additions and 15 deletions
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7
docs/ReleaseNotes.rst
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@ -74,6 +74,13 @@ Changes to building LLVM
Changes to TableGen
-------------------
Changes to Backend Code Generation
----------------------------------
* When lowering calls, only ABI attributes on the call itself are checked, not
the caller. Frontends need to make sure to properly set ABI attributes on
calls (and always should have).
Changes to the ARM Backend
--------------------------

33
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -102,29 +102,32 @@ bool TargetLowering::parametersInCSRMatch(const MachineRegisterInfo &MRI,
return true;
}
/// Set CallLoweringInfo attribute flags based on a call instruction
/// and called function attributes.
/// Set CallLoweringInfo attribute flags based on the call instruction's
/// argument attributes.
void TargetLoweringBase::ArgListEntry::setAttributes(const CallBase *Call,
unsigned ArgIdx) {
IsSExt = Call->paramHasAttr(ArgIdx, Attribute::SExt);
IsZExt = Call->paramHasAttr(ArgIdx, Attribute::ZExt);
IsInReg = Call->paramHasAttr(ArgIdx, Attribute::InReg);
IsSRet = Call->paramHasAttr(ArgIdx, Attribute::StructRet);
IsNest = Call->paramHasAttr(ArgIdx, Attribute::Nest);
IsByVal = Call->paramHasAttr(ArgIdx, Attribute::ByVal);
IsPreallocated = Call->paramHasAttr(ArgIdx, Attribute::Preallocated);
IsInAlloca = Call->paramHasAttr(ArgIdx, Attribute::InAlloca);
IsReturned = Call->paramHasAttr(ArgIdx, Attribute::Returned);
IsSwiftSelf = Call->paramHasAttr(ArgIdx, Attribute::SwiftSelf);
IsSwiftAsync = Call->paramHasAttr(ArgIdx, Attribute::SwiftAsync);
IsSwiftError = Call->paramHasAttr(ArgIdx, Attribute::SwiftError);
Alignment = Call->getParamStackAlign(ArgIdx);
auto Attrs = Call->getAttributes();
IsSExt = Attrs.hasParamAttribute(ArgIdx, Attribute::SExt);
IsZExt = Attrs.hasParamAttribute(ArgIdx, Attribute::ZExt);
IsInReg = Attrs.hasParamAttribute(ArgIdx, Attribute::InReg);
IsSRet = Attrs.hasParamAttribute(ArgIdx, Attribute::StructRet);
IsNest = Attrs.hasParamAttribute(ArgIdx, Attribute::Nest);
IsReturned = Attrs.hasParamAttribute(ArgIdx, Attribute::Returned);
IsSwiftSelf = Attrs.hasParamAttribute(ArgIdx, Attribute::SwiftSelf);
IsSwiftAsync = Attrs.hasParamAttribute(ArgIdx, Attribute::SwiftAsync);
IsSwiftError = Attrs.hasParamAttribute(ArgIdx, Attribute::SwiftError);
Alignment = Attrs.getParamStackAlignment(ArgIdx);
IsByVal = Attrs.hasParamAttribute(ArgIdx, Attribute::ByVal);
ByValType = nullptr;
if (IsByVal) {
ByValType = Call->getParamByValType(ArgIdx);
if (!Alignment)
Alignment = Call->getParamAlign(ArgIdx);
}
IsInAlloca = Attrs.hasParamAttribute(ArgIdx, Attribute::InAlloca);
IsPreallocated = Attrs.hasParamAttribute(ArgIdx, Attribute::Preallocated);
PreallocatedType = nullptr;
if (IsPreallocated)
PreallocatedType = Call->getParamPreallocatedType(ArgIdx);

45
test/CodeGen/X86/mismatched-byval.ll Normal file
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@ -0,0 +1,45 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s
; This tests that we only look at the call site for ABI attributes, so f and f2 should codegen differently
define void @b(i8* byval(i8) %p) {
; CHECK-LABEL: b:
; CHECK: # %bb.0:
; CHECK-NEXT: retq
ret void
}
define void @f(i8 %p) {
; CHECK-LABEL: f:
; CHECK: # %bb.0:
; CHECK-NEXT: subq $24, %rsp
; CHECK-NEXT: .cfi_def_cfa_offset 32
; CHECK-NEXT: movb {{[0-9]+}}(%rsp), %al
; CHECK-NEXT: movb %al, (%rsp)
; CHECK-NEXT: callq b@PLT
; CHECK-NEXT: addq $24, %rsp
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
%a = alloca i8
;store i8 %p, i8* %a
call void @b(i8* byval(i8) %a)
ret void
}
define void @f2(i8 %p) {
; CHECK-LABEL: f2:
; CHECK: # %bb.0:
; CHECK-NEXT: pushq %rax
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: leaq {{[0-9]+}}(%rsp), %rdi
; CHECK-NEXT: callq b@PLT
; CHECK-NEXT: popq %rax
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
%a = alloca i8
;store i8 %p, i8* %a
call void @b(i8* %a)
ret void
}