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Insert array bound checks for slices.

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This commit is contained in:
Christian Kamm 2008-07-30 19:02:13 +02:00
parent 7882f4858e
commit 5b5d7404b4
3 changed files with 15 additions and 7 deletions
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13
gen/llvmhelpers.cpp
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@ -158,7 +158,7 @@ void DtoAssert(Loc* loc, DValue* msg)
// ARRAY BOUNDS HELPER
////////////////////////////////////////////////////////////////////////////////////////*/
void DtoArrayBoundsCheck(Loc& loc, DValue* arr, DValue* index)
void DtoArrayBoundsCheck(Loc& loc, DValue* arr, DValue* index, bool isslice)
{
Type* arrty = arr->getType();
assert((arrty->ty == Tsarray || arrty->ty == Tarray) && "Can only array bounds check for static or dynamic arrays");
@ -171,8 +171,12 @@ void DtoArrayBoundsCheck(Loc& loc, DValue* arr, DValue* index)
size_t tdim = tsa->dim->toInteger();
if(llvm::ConstantInt* cindex = llvm::dyn_cast<llvm::ConstantInt>(index->getRVal()))
if(cindex->uge(tdim)) {
error(loc, "index %d is larger than array size %d", index, tdim);
if(cindex->uge(tdim + (isslice ? 1 : 0))) {
size_t cindexval = cindex->getValue().getZExtValue();
if(!isslice)
error(loc, "index %u is larger or equal array size %u", cindexval, tdim);
else
error(loc, "slice upper bound %u is larger than array size %u", cindexval, tdim);
return;
}
}
@ -183,7 +187,8 @@ void DtoArrayBoundsCheck(Loc& loc, DValue* arr, DValue* index)
llvm::BasicBlock* failbb = llvm::BasicBlock::Create("arrayboundscheckfail", gIR->topfunc(), oldend);
llvm::BasicBlock* okbb = llvm::BasicBlock::Create("arrayboundsok", gIR->topfunc(), oldend);
LLValue* cond = gIR->ir->CreateICmp(llvm::ICmpInst::ICMP_ULT, index->getRVal(), DtoArrayLen(arr), "boundscheck");
llvm::ICmpInst::Predicate cmpop = isslice ? llvm::ICmpInst::ICMP_ULE : llvm::ICmpInst::ICMP_ULT;
LLValue* cond = gIR->ir->CreateICmp(cmpop, index->getRVal(), DtoArrayLen(arr), "boundscheck");
gIR->ir->CreateCondBr(cond, okbb, failbb);
// set up failbb to call the array bounds error runtime function