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Add IR constructs for preallocated (inalloca replacement)

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Add llvm.call.preallocated.{setup,arg} instrinsics.
Add "preallocated" operand bundle which takes a token produced by llvm.call.preallocated.setup.
Add "preallocated" parameter attribute, which is like byval but without the copy.

Verifier changes for these IR constructs.

See https://github.com/rnk/llvm-project/blob/call-setup-docs/llvm/docs/CallSetup.md

Subscribers: hiraditya, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74651
This commit is contained in:
Arthur Eubanks
2020-02-14 14:16:53 -08:00
parent 18752d6445
commit 0d7675c47c
23 changed files with 564 additions and 37 deletions
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20
lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -1303,6 +1303,9 @@ static uint64_t getRawAttributeMask(Attribute::AttrKind Val) {
case Attribute::SanitizeMemTag:
llvm_unreachable("sanitize_memtag attribute not supported in raw format");
break;
case Attribute::Preallocated:
llvm_unreachable("preallocated attribute not supported in raw format");
break;
}
llvm_unreachable("Unsupported attribute type");
}
@@ -1312,12 +1315,10 @@ static void addRawAttributeValue(AttrBuilder &B, uint64_t Val) {
for (Attribute::AttrKind I = Attribute::None; I != Attribute::EndAttrKinds;
I = Attribute::AttrKind(I + 1)) {
if (I == Attribute::SanitizeMemTag ||
I == Attribute::Dereferenceable ||
I == Attribute::DereferenceableOrNull ||
I == Attribute::ArgMemOnly ||
I == Attribute::AllocSize ||
I == Attribute::NoSync)
if (I == Attribute::SanitizeMemTag || I == Attribute::Dereferenceable ||
I == Attribute::DereferenceableOrNull || I == Attribute::ArgMemOnly ||
I == Attribute::AllocSize || I == Attribute::NoSync ||
I == Attribute::Preallocated)
continue;
if (uint64_t A = (Val & getRawAttributeMask(I))) {
if (I == Attribute::Alignment)
@@ -1544,6 +1545,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
return Attribute::ImmArg;
case bitc::ATTR_KIND_SANITIZE_MEMTAG:
return Attribute::SanitizeMemTag;
case bitc::ATTR_KIND_PREALLOCATED:
return Attribute::Preallocated;
}
}
@@ -1659,8 +1662,11 @@ Error BitcodeReader::parseAttributeGroupBlock() {
Attribute::AttrKind Kind;
if (Error Err = parseAttrKind(Record[++i], &Kind))
return Err;
if (Kind == Attribute::ByVal)
if (Kind == Attribute::ByVal) {
B.addByValAttr(HasType ? getTypeByID(Record[++i]) : nullptr);
} else if (Kind == Attribute::Preallocated) {
B.addPreallocatedAttr(getTypeByID(Record[++i]));
}
}
}