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[CallLowering] Support opaque pointers 

Always use the byval/inalloca/preallocated type (which is required
nowadays), don't fall back on the pointer element type.

This requires adding Function::getParamPreallocatedType() to
mirror the CallBase API, so that the templated code can work with
both.
This commit is contained in:
Nikita Popov 2021-09-10 18:13:08 +02:00
parent d34d2bbe5d
commit 14afbe9448
3 changed files with 16 additions and 8 deletions
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5
llvm/include/llvm/IR/Function.h
View File

@ -478,6 +478,11 @@ public:
return AttributeSets.getParamByRefType(ArgNo);
}
/// Extract the preallocated type for a parameter.
Type *getParamPreallocatedType(unsigned ArgNo) const {
return AttributeSets.getParamPreallocatedType(ArgNo);
}
/// Extract the number of dereferenceable bytes for a parameter.
/// @param ArgNo Index of an argument, with 0 being the first function arg.
uint64_t getParamDereferenceableBytes(unsigned ArgNo) const {

18
llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
View File

@ -166,19 +166,21 @@ void CallLowering::setArgFlags(CallLowering::ArgInfo &Arg, unsigned OpIdx,
Align MemAlign = DL.getABITypeAlign(Arg.Ty);
if (Flags.isByVal() || Flags.isInAlloca() || Flags.isPreallocated()) {
assert(OpIdx >= AttributeList::FirstArgIndex);
Type *ElementTy = PtrTy->getElementType();
unsigned ParamIdx = OpIdx - AttributeList::FirstArgIndex;
auto Ty =
Attrs.getAttributeAtIndex(OpIdx, Attribute::ByVal).getValueAsType();
Flags.setByValSize(DL.getTypeAllocSize(Ty ? Ty : ElementTy));
Type *ElementTy = FuncInfo.getParamByValType(ParamIdx);
if (!ElementTy)
ElementTy = FuncInfo.getParamInAllocaType(ParamIdx);
if (!ElementTy)
ElementTy = FuncInfo.getParamPreallocatedType(ParamIdx);
assert(ElementTy && "Must have byval, inalloca or preallocated type");
Flags.setByValSize(DL.getTypeAllocSize(ElementTy));
// For ByVal, alignment should be passed from FE. BE will guess if
// this info is not there but there are cases it cannot get right.
if (auto ParamAlign =
FuncInfo.getParamStackAlign(OpIdx - AttributeList::FirstArgIndex))
if (auto ParamAlign = FuncInfo.getParamStackAlign(ParamIdx))
MemAlign = *ParamAlign;
else if ((ParamAlign =
FuncInfo.getParamAlign(OpIdx - AttributeList::FirstArgIndex)))
else if ((ParamAlign = FuncInfo.getParamAlign(ParamIdx)))
MemAlign = *ParamAlign;
else
MemAlign = Align(getTLI()->getByValTypeAlignment(ElementTy, DL));

1
llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-stack-objects.ll
View File

@ -1,4 +1,5 @@
; RUN: llc -global-isel -mtriple=aarch64-unknown-unknown -stop-after=irtranslator -verify-machineinstrs %s -o - | FileCheck %s
; RUN: llc -global-isel -mtriple=aarch64-unknown-unknown -stop-after=irtranslator -verify-machineinstrs -opaque-pointers %s -o - | FileCheck %s
; The byval object should not be immutable, but the non-byval stack
; passed argument should be.