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Add the allocsize attribute to LLVM.

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`allocsize` is a function attribute that allows users to request that
LLVM treat arbitrary functions as allocation functions.

This patch makes LLVM accept the `allocsize` attribute, and makes
`@llvm.objectsize` recognize said attribute.

The review for this was split into two patches for ease of reviewing:
D18974 and D14933. As promised on the revisions, I'm landing both
patches as a single commit.

Differential Revision: http://reviews.llvm.org/D14933

llvm-svn: 266032
This commit is contained in:
George Burgess IV
2016-04-12 01:05:35 +00:00
parent b40d14f3d5
commit 278199f615
20 changed files with 577 additions and 71 deletions
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4
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -1288,6 +1288,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
return Attribute::Dereferenceable;
case bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL:
return Attribute::DereferenceableOrNull;
case bitc::ATTR_KIND_ALLOC_SIZE:
return Attribute::AllocSize;
case bitc::ATTR_KIND_NO_RED_ZONE:
return Attribute::NoRedZone;
case bitc::ATTR_KIND_NO_RETURN:
@@ -1412,6 +1414,8 @@ std::error_code BitcodeReader::parseAttributeGroupBlock() {
B.addDereferenceableAttr(Record[++i]);
else if (Kind == Attribute::DereferenceableOrNull)
B.addDereferenceableOrNullAttr(Record[++i]);
else if (Kind == Attribute::AllocSize)
B.addAllocSizeAttrFromRawRepr(Record[++i]);
} else { // String attribute
assert((Record[i] == 3 || Record[i] == 4) &&
"Invalid attribute group entry");