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#include "cps/RuntimeCheck.h"
#include "cps/ExceptionHandler.h"
#include "cps/TypeSystem.h" // kEnumOrdinalBase
#include "llvm/IR/Function.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Constants.h"
using namespace llvm;
using namespace cps;
RuntimeCheck::RuntimeCheck(LLVMContext &C, IRBuilder<> &B, ExceptionHandler &EH)
: TheContext(C), Builder(B), Exceptions(EH) {}
void RuntimeCheck::emitCheck(Value *Condition) {
Function *TheFunction = Builder.GetInsertBlock()->getParent();
BasicBlock *FailBB = BasicBlock::Create(TheContext, "check_fail", TheFunction);
BasicBlock *ContBB = BasicBlock::Create(TheContext, "check_cont", TheFunction);
Builder.CreateCondBr(Condition, FailBB, ContBB);
Builder.SetInsertPoint(FailBB);
Exceptions.emitThrow();
Builder.SetInsertPoint(ContBB);
}
void RuntimeCheck::emitDivZeroCheck(Value *Divisor, int Line) {
Value *IsZero;
if (Divisor->getType()->isFloatingPointTy()) {
IsZero = Builder.CreateFCmpOEQ(Divisor, ConstantFP::get(Divisor->getType(), 0.0), "is_zero");
} else {
IsZero = Builder.CreateICmpEQ(Divisor, ConstantInt::get(Divisor->getType(), 0), "is_zero");
}
emitCheck(IsZero);
}
void RuntimeCheck::emitIndexCheck(Value *Index, Value *Lower, Value *Upper, int Line) {
Value *TooLow = Builder.CreateICmpSLT(Index, Lower, "too_low");
Value *TooHigh = Builder.CreateICmpSGT(Index, Upper, "too_high");
Value *OutOfBounds = Builder.CreateOr(TooLow, TooHigh, "out_of_bounds");
emitCheck(OutOfBounds);
}
void RuntimeCheck::emitEnumRangeCheck(Value *Ordinal, uint64_t ValueCount,
const std::string &TypeName, int Line) {
Value *Lo = ConstantInt::get(TheContext, APInt(64, static_cast<uint64_t>(kEnumOrdinalBase), true));
Value *Hi = ConstantInt::get(TheContext,
APInt(64, static_cast<uint64_t>(kEnumOrdinalBase) + ValueCount, true));
Value *TooLow = Builder.CreateICmpSLT(Ordinal, Lo, "enum_too_low");
Value *TooHigh = Builder.CreateICmpSGE(Ordinal, Hi, "enum_too_high");
Value *OutOfRange = Builder.CreateOr(TooLow, TooHigh, "enum_out_of_range");
emitCheck(OutOfRange);
}
void RuntimeCheck::emitNullDerefCheck(Value *Ptr, int Line) {
Value *IsNull = Builder.CreateICmpEQ(Ptr,
ConstantPointerNull::get(PointerType::getUnqual(TheContext)),
"ptr_is_null");
emitCheck(IsNull);
}
void RuntimeCheck::emitArrayArgBoundsCheck(Value *ActualLower, Value *ActualUpper,
int64_t DeclaredLower, int64_t DeclaredUpper,
int Line) {
Value *DeclLo = ConstantInt::get(TheContext, APInt(64, static_cast<uint64_t>(DeclaredLower), true));
Value *DeclHi = ConstantInt::get(TheContext, APInt(64, static_cast<uint64_t>(DeclaredUpper), true));
Value *LoDiff = Builder.CreateICmpNE(ActualLower, DeclLo, "arg_lo_ne");
Value *HiDiff = Builder.CreateICmpNE(ActualUpper, DeclHi, "arg_hi_ne");
Value *Mismatch = Builder.CreateOr(LoDiff, HiDiff, "arg_bounds_ne");
emitCheck(Mismatch);
}
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