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Document the maximum LLVM IR alignment, which is 1 << 29 or 0.5 GiB

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Add verifier checks.  We already check these in the assembly parser, but
a frontend producing IR in memory wouldn't hit those checks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213027 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-07-15 01:16:09 +00:00
parent 7137eb36e1
commit cbebdef6eb
2 changed files with 16 additions and 6 deletions
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8
lib/IR/Verifier.cpp
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@@ -380,6 +380,8 @@ void Verifier::visitGlobalValue(const GlobalValue &GV) {
"Global is external, but doesn't have external or weak linkage!",
&GV);
Assert1(GV.getAlignment() <= Value::MaximumAlignment,
"huge alignment values are unsupported", &GV);
Assert1(!GV.hasAppendingLinkage() || isa<GlobalVariable>(GV),
"Only global variables can have appending linkage!", &GV);
@@ -1891,6 +1893,8 @@ void Verifier::visitLoadInst(LoadInst &LI) {
Type *ElTy = PTy->getElementType();
Assert2(ElTy == LI.getType(),
"Load result type does not match pointer operand type!", &LI, ElTy);
Assert1(LI.getAlignment() <= Value::MaximumAlignment,
"huge alignment values are unsupported", &LI);
if (LI.isAtomic()) {
Assert1(LI.getOrdering() != Release && LI.getOrdering() != AcquireRelease,
"Load cannot have Release ordering", &LI);
@@ -1966,6 +1970,8 @@ void Verifier::visitStoreInst(StoreInst &SI) {
Assert2(ElTy == SI.getOperand(0)->getType(),
"Stored value type does not match pointer operand type!",
&SI, ElTy);
Assert1(SI.getAlignment() <= Value::MaximumAlignment,
"huge alignment values are unsupported", &SI);
if (SI.isAtomic()) {
Assert1(SI.getOrdering() != Acquire && SI.getOrdering() != AcquireRelease,
"Store cannot have Acquire ordering", &SI);
@@ -1997,6 +2003,8 @@ void Verifier::visitAllocaInst(AllocaInst &AI) {
&AI);
Assert1(AI.getArraySize()->getType()->isIntegerTy(),
"Alloca array size must have integer type", &AI);
Assert1(AI.getAlignment() <= Value::MaximumAlignment,
"huge alignment values are unsupported", &AI);
visitInstruction(AI);
}