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Swift Calling Convention: add swifterror attribute.

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A ``swifterror`` attribute can be applied to a function parameter or an
AllocaInst.

This commit does not include any target-specific change. The target-specific
optimization will come as a follow-up patch.

Differential Revision: http://reviews.llvm.org/D18092

llvm-svn: 265189
This commit is contained in:
Manman Ren
2016-04-01 21:41:15 +00:00
parent a3d15f3a5e
commit 9bfd0d03e9
26 changed files with 236 additions and 11 deletions
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10
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -1317,6 +1317,8 @@ static Attribute::AttrKind getAttrFromCode(uint64_t Code) {
return Attribute::SanitizeThread;
case bitc::ATTR_KIND_SANITIZE_MEMORY:
return Attribute::SanitizeMemory;
case bitc::ATTR_KIND_SWIFT_ERROR:
return Attribute::SwiftError;
case bitc::ATTR_KIND_SWIFT_SELF:
return Attribute::SwiftSelf;
case bitc::ATTR_KIND_UW_TABLE:
@@ -4843,10 +4845,11 @@ std::error_code BitcodeReader::parseFunctionBody(Function *F) {
uint64_t AlignRecord = Record[3];
const uint64_t InAllocaMask = uint64_t(1) << 5;
const uint64_t ExplicitTypeMask = uint64_t(1) << 6;
// Reserve bit 7 for SwiftError flag.
// const uint64_t SwiftErrorMask = uint64_t(1) << 7;
const uint64_t FlagMask = InAllocaMask | ExplicitTypeMask;
const uint64_t SwiftErrorMask = uint64_t(1) << 7;
const uint64_t FlagMask = InAllocaMask | ExplicitTypeMask |
SwiftErrorMask;
bool InAlloca = AlignRecord & InAllocaMask;
bool SwiftError = AlignRecord & SwiftErrorMask;
Type *Ty = getTypeByID(Record[0]);
if ((AlignRecord & ExplicitTypeMask) == 0) {
auto *PTy = dyn_cast_or_null<PointerType>(Ty);
@@ -4865,6 +4868,7 @@ std::error_code BitcodeReader::parseFunctionBody(Function *F) {
return error("Invalid record");
AllocaInst *AI = new AllocaInst(Ty, Size, Align);
AI->setUsedWithInAlloca(InAlloca);
AI->setSwiftError(SwiftError);
I = AI;
InstructionList.push_back(I);
break;