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Add 'musttail' marker to call instructions

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This is similar to the 'tail' marker, except that it guarantees that
tail call optimization will occur.  It also comes with convervative IR
verification rules that ensure that tail call optimization is possible.

Reviewers: nicholas

Differential Revision: http://llvm-reviews.chandlerc.com/D3240

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-04-24 20:14:34 +00:00
parent 870200a833
commit 710c1a449d
21 changed files with 334 additions and 30 deletions
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19
lib/AsmParser/LLParser.cpp
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@@ -3367,8 +3367,10 @@ int LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
case lltok::kw_shufflevector: return ParseShuffleVector(Inst, PFS);
case lltok::kw_phi: return ParsePHI(Inst, PFS);
case lltok::kw_landingpad: return ParseLandingPad(Inst, PFS);
case lltok::kw_call: return ParseCall(Inst, PFS, false);
case lltok::kw_tail: return ParseCall(Inst, PFS, true);
// Call.
case lltok::kw_call: return ParseCall(Inst, PFS, CallInst::TCK_None);
case lltok::kw_tail: return ParseCall(Inst, PFS, CallInst::TCK_Tail);
case lltok::kw_musttail: return ParseCall(Inst, PFS, CallInst::TCK_MustTail);
// Memory.
case lltok::kw_alloca: return ParseAlloc(Inst, PFS);
case lltok::kw_load: return ParseLoad(Inst, PFS);
@@ -3984,10 +3986,14 @@ bool LLParser::ParseLandingPad(Instruction *&Inst, PerFunctionState &PFS) {
}
/// ParseCall
/// ::= 'tail'? 'call' OptionalCallingConv OptionalAttrs Type Value
/// ::= 'call' OptionalCallingConv OptionalAttrs Type Value
/// ParameterList OptionalAttrs
/// ::= 'tail' 'call' OptionalCallingConv OptionalAttrs Type Value
/// ParameterList OptionalAttrs
/// ::= 'musttail' 'call' OptionalCallingConv OptionalAttrs Type Value
/// ParameterList OptionalAttrs
bool LLParser::ParseCall(Instruction *&Inst, PerFunctionState &PFS,
bool isTail) {
CallInst::TailCallKind TCK) {
AttrBuilder RetAttrs, FnAttrs;
std::vector<unsigned> FwdRefAttrGrps;
LocTy BuiltinLoc;
@@ -3998,7 +4004,8 @@ bool LLParser::ParseCall(Instruction *&Inst, PerFunctionState &PFS,
SmallVector<ParamInfo, 16> ArgList;
LocTy CallLoc = Lex.getLoc();
if ((isTail && ParseToken(lltok::kw_call, "expected 'tail call'")) ||
if ((TCK != CallInst::TCK_None &&
ParseToken(lltok::kw_call, "expected 'tail call'")) ||
ParseOptionalCallingConv(CC) ||
ParseOptionalReturnAttrs(RetAttrs) ||
ParseType(RetType, RetTypeLoc, true /*void allowed*/) ||
@@ -4074,7 +4081,7 @@ bool LLParser::ParseCall(Instruction *&Inst, PerFunctionState &PFS,
AttributeSet PAL = AttributeSet::get(Context, Attrs);
CallInst *CI = CallInst::Create(Callee, Args);
CI->setTailCall(isTail);
CI->setTailCallKind(TCK);
CI->setCallingConv(CC);
CI->setAttributes(PAL);
ForwardRefAttrGroups[CI] = FwdRefAttrGrps;