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add the 'alloc' metadata node to represent the size of offset of buffers pointed to by pointers.

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This metadata can be attached to any instruction returning a pointer


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-06-18 16:04:04 +00:00
parent 96ef284da4
commit fa7494306b
6 changed files with 151 additions and 1 deletions
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5
lib/VMCore/LLVMContext.cpp
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@@ -53,6 +53,11 @@ LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) {
unsigned RangeID = getMDKindID("range");
assert(RangeID == MD_range && "range kind id drifted");
(void)RangeID;
// Create the 'alloc' metadata kind.
unsigned AllocID = getMDKindID("alloc");
assert(AllocID == MD_alloc && "alloc kind id drifted");
(void)AllocID;
}
LLVMContext::~LLVMContext() { delete pImpl; }

33
lib/VMCore/Verifier.cpp
View File

@@ -1672,6 +1672,39 @@ void Verifier::visitInstruction(Instruction &I) {
}
}
if (MDNode *MD = I.getMetadata(LLVMContext::MD_alloc)) {
Assert1(I.getType()->isPointerTy(), "alloc requires a pointer result", &I);
Assert1(MD->getNumOperands() >= 1, "alloc takes at least one operand", &I);
Function *SizeFn = dyn_cast<Function>(MD->getOperand(0));
Function *OffsetFn = MD->getNumOperands() >= 2 ?
dyn_cast_or_null<Function>(MD->getOperand(1)) : 0;
Assert1(SizeFn, "first parameter of alloc must be a function", &I);
Assert1(MD->getNumOperands() == 1 || !MD->getOperand(1) || OffsetFn,
"second parameter of alloc must be either a function or null", &I);
Assert1(SizeFn->onlyReadsMemory(),
"size function must be readonly/readnone", &I);
Assert1(!OffsetFn || OffsetFn->onlyReadsMemory(),
"offset function must be readonly/readnone", &I);
Assert1(SizeFn->getReturnType()->isIntegerTy(),
"size function must return an integer", &I);
Assert1(!OffsetFn || OffsetFn->getReturnType()->isIntegerTy(),
"offset function must return an integer", &I);
FunctionType *SizeFnTy = SizeFn->getFunctionType();
FunctionType *OffsetFnTy = OffsetFn ? OffsetFn->getFunctionType() : 0;
Assert1(SizeFnTy->getNumParams() == MD->getNumOperands()-2,
"size function number of parameters mismatch", &I);
Assert1(!OffsetFnTy || OffsetFnTy->getNumParams() == MD->getNumOperands()-2,
"offset function number of parameters mismatch", &I);
for (unsigned i = 0, e = SizeFnTy->getNumParams(); i != e; ++i) {
Assert1(SizeFnTy->getParamType(i) == MD->getOperand(i+2)->getType(),
"size function parameter type mismatch", &I);
if (OffsetFnTy)
Assert1(OffsetFnTy->getParamType(i) == MD->getOperand(i+2)->getType(),
"offset function parameter type mismatch", &I);
}
}
MDNode *MD = I.getMetadata(LLVMContext::MD_range);
Assert1(!MD || isa<LoadInst>(I), "Ranges are only for loads!", &I);