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#include "cps/RuntimeCheck.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(Module &M, LLVMContext &C, IRBuilder<> &B)
: TheModule(M), TheContext(C), Builder(B) {
setupExternalFunctions();
}
void RuntimeCheck::setupExternalFunctions() {
std::vector<Type*> PrintfArgs;
PrintfArgs.push_back(PointerType::getUnqual(TheContext));
FunctionType *PrintfType = FunctionType::get(Type::getInt32Ty(TheContext), PrintfArgs, true);
PrintfFunc = TheModule.getOrInsertFunction("printf", PrintfType);
std::vector<Type*> ExitArgs;
ExitArgs.push_back(Type::getInt32Ty(TheContext));
FunctionType *ExitType = FunctionType::get(Type::getVoidTy(TheContext), ExitArgs, false);
ExitFunc = TheModule.getOrInsertFunction("exit", ExitType);
DivZeroMsg = Builder.CreateGlobalStringPtr("[Fatal] line %d: Division by zero\n", "err_div_zero", 0, &TheModule);
OutOfBoundsMsg = Builder.CreateGlobalStringPtr("[Fatal] line %d: Array index out of bounds\n", "err_bounds", 0, &TheModule);
EnumRangeMsg = Builder.CreateGlobalStringPtr("[Fatal] line %d: Value out of range for enum %s\n", "err_enum_range", 0, &TheModule);
NullDerefMsg = Builder.CreateGlobalStringPtr("[Fatal] line %d: Dereference of an unset pointer\n", "err_null_deref", 0, &TheModule);
}
void RuntimeCheck::emitErrorAndExit(Value *Condition, Value *Msg, int Line) {
emitErrorAndExit(Condition, Msg, {ConstantInt::get(TheContext, APInt(32, Line))});
}
void RuntimeCheck::emitErrorAndExit(Value *Condition, Value *Msg, ArrayRef<Value *> FmtArgs) {
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);
std::vector<Value*> PrintArgs;
PrintArgs.push_back(Msg);
PrintArgs.insert(PrintArgs.end(), FmtArgs.begin(), FmtArgs.end());
Builder.CreateCall(PrintfFunc, PrintArgs);
Builder.CreateCall(ExitFunc, ConstantInt::get(TheContext, APInt(32, 1)));
Builder.CreateUnreachable();
Builder.SetInsertPoint(ContBB);
}
void RuntimeCheck::emitDivZeroCheck(Value *Divisor, int Line) {
Value *IsZero = Builder.CreateICmpEQ(Divisor, ConstantInt::get(TheContext, APInt(64, 0)), "is_zero");
emitErrorAndExit(IsZero, DivZeroMsg, Line);
}
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");
emitErrorAndExit(OutOfBounds, OutOfBoundsMsg, Line);
}
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");
Value *NameStr = Builder.CreateGlobalStringPtr(TypeName, "enum_name", 0, &TheModule);
emitErrorAndExit(OutOfRange, EnumRangeMsg,
{ConstantInt::get(TheContext, APInt(32, Line)), NameStr});
}
void RuntimeCheck::emitNullDerefCheck(Value *Ptr, int Line) {
Value *IsNull = Builder.CreateICmpEQ(Ptr,
ConstantPointerNull::get(PointerType::getUnqual(TheContext)),
"ptr_is_null");
emitErrorAndExit(IsNull, NullDerefMsg, Line);
}
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