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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"
#include "llvm/IR/GlobalVariable.h"
using namespace llvm;
using namespace cps;
RuntimeCheck::RuntimeCheck(Module &M, LLVMContext &C, IRBuilder<> &B, ExceptionHandler &EH)
: TheModule(M), TheContext(C), Builder(B), Exceptions(EH) {
UserLine = new GlobalVariable(TheModule, Builder.getInt32Ty(), false,
GlobalValue::ExternalLinkage, Builder.getInt32(0), "__cps_user_line");
setupExternalFunctions();
}
Value *RuntimeCheck::lineValue(int Line) {
return LibraryMode ? Builder.CreateLoad(Builder.getInt32Ty(), UserLine, "user_line")
: static_cast<Value *>(Builder.getInt32(Line));
}
void RuntimeCheck::setUserLine(int Line) {
Builder.CreateStore(Builder.getInt32(Line), UserLine);
}
void RuntimeCheck::setupExternalFunctions() {
Type *PtrTy = PointerType::getUnqual(TheContext);
Type *I32 = Type::getInt32Ty(TheContext);
FprintfFunc = TheModule.getOrInsertFunction(
"fprintf", FunctionType::get(I32, {PtrTy, PtrTy}, true));
// The stderr FILE* is a platform-specific symbol; host and target match.
#if defined(_WIN32)
StderrFunc = TheModule.getOrInsertFunction(
"__acrt_iob_func", FunctionType::get(PtrTy, {I32}, false));
#else
#if defined(__APPLE__)
const char *StderrName = "__stderrp";
#else
const char *StderrName = "stderr";
#endif
StderrVar = new GlobalVariable(TheModule, PtrTy, false, GlobalValue::ExternalLinkage,
nullptr, StderrName);
#endif
DivZeroMsg = Builder.CreateGlobalString("[Fatal] line %d: Division by zero\n", "err_div_zero", 0, &TheModule);
OutOfBoundsMsg = Builder.CreateGlobalString("[Fatal] line %d: Array index out of bounds\n", "err_bounds", 0, &TheModule);lass="hl sng">"strcpy", StrCpyType);
StrCatFunc = Module.getOrInsertFunction("strcat", StrCpyType);
StrCmpFunc = Module.getOrInsertFunction("strcmp",
FunctionType::get(Type::getInt32Ty(Context),
{PointerType::getUnqual(Context), PointerType::getUnqual(Context)}, false));
FunctionType *CharCaseType = FunctionType::get(Type::getInt32Ty(Context), {Type::getInt32Ty(Context)}, false);
ToUpperFunc = Module.getOrInsertFunction("toupper", CharCaseType);
ToLowerFunc = Module.getOrInsertFunction("tolower", CharCaseType);
}
Value *StringHandler::createLiteral(const std::string &Val) {
return Builder.CreateGlobalStringPtr(Val);
}
Value *StringHandler::emitLength(Value *Str) {
if (!Str) return nullptr;
return Builder.CreateCall(StrLenFunc, Str, "len");
}
Value *StringHandler::emitConcat(Value *LHS, Value *RHS) {
if (!LHS || !RHS) return nullptr;
Value *LLen = Builder.CreateCall(StrLenFunc, {LHS}, "llen");
Value *RLen = Builder.CreateCall(StrLenFunc, {RHS}, "rlen");
Value *TotalLen = Builder.CreateAdd(LLen, RLen, "totallen");
Value *AllocSize = Builder.CreateAdd(TotalLen, ConstantInt::get(Type::getInt64Ty(Context), 1), "allocsize");
Value *NewStr = Builder.CreateCall(MallocFunc, {AllocSize}, "concat_str");
Builder.CreateCall(StrCpyFunc, {NewStr, LHS});
Builder.CreateCall(StrCatFunc, {NewStr, RHS});
return NewStr;
}
Value *StringHandler::emitCompare(int Op, Value *LHS, Value *RHS) {
if (!LHS || !RHS) return nullptr;
CmpInst::Predicate Pred;
switch (Op) {
case tok_eq: Pred = CmpInst::ICMP_EQ; break;
case tok_ne: Pred = CmpInst::ICMP_NE; break;
case '<': Pred = CmpInst::ICMP_SLT; break;
case '>': Pred = CmpInst::ICMP_SGT; break;
case tok_le: Pred = CmpInst::ICMP_SLE; break;
case tok_ge: Pred = CmpInst::ICMP_SGE; break;
default: return nullptr;
}
Value *Cmp = Builder.CreateCall(StrCmpFunc, {LHS, RHS}, "strcmp_result");
return Builder.CreateICmp(Pred, Cmp, ConstantInt::get(Type::getInt32Ty(Context), 0), "str_compare");
}
// malloc(Len + 1), copy Len bytes from Src + StartIdx, NUL-terminate.
// Clamping is each caller's business — MID/RIGHT/LEFT clamp different things.
Value *StringHandler::allocCopySubstring(Value *Src, Value *StartIdx, Value *Len) {
Value *One = ConstantInt::get(Context, APInt(64, 1));
Value *AllocSize = Builder.CreateAdd(Len, One);
Value *NewStr = Builder.CreateCall(MallocFunc, AllocSize, "substr_mem");
Value *SrcPtr = Builder.CreateInBoundsGEP(Type::getInt8Ty(Context), Src, StartIdx);
Builder.CreateCall(MemCpyFunc, {NewStr, SrcPtr, Len});
Value *NullTermPtr = Builder.CreateInBoundsGEP(Type::getInt8Ty(Context), NewStr, Len);
Builder.CreateStore(ConstantInt::get(Type::getInt8Ty(Context), 0), NullTermPtr);
return NewStr;
}
Value *StringHandler::emitMid(Value *Str, Value *Start, Value *Len) {
Value *FullLen = emitLength(Str);
Value *One = ConstantInt::get(Context, APInt(64, 1));
Value *Zero = ConstantInt::get(Context, APInt(64, 0));
Value *StartZeroBased = Builder.CreateSub(Start, One, "start_idx");
Value *IsNeg = Builder.CreateICmpSLT(StartZeroBased, Zero);
StartZeroBased = Builder.CreateSelect(IsNeg, Zero, StartZeroBased);
Value *IsTooBig = Builder.CreateICmpSGT(StartZeroBased, FullLen);
StartZeroBased = Builder.CreateSelect(IsTooBig, FullLen, StartZeroBased);
Value *RemLen = Builder.CreateSub(FullLen, StartZeroBased);
Value *IsLenTooBig = Builder.CreateICmpSGT(Len, RemLen);
Value *ActualLen = Builder.CreateSelect(IsLenTooBig, RemLen, Len);
Value *IsLenNeg = Builder.CreateICmpSLT(ActualLen, Zero);
ActualLen = Builder.CreateSelect(IsLenNeg, Zero, ActualLen);
return allocCopySubstring(Str, StartZeroBased, ActualLen);
}
Value *StringHandler::emitRight(Value *Str, Value *Len) {
Value *FullLen = emitLength(Str);
Value *StartIdx = Builder.CreateSub(FullLen, Len, "right_start");
Value *Zero = ConstantInt::get(Context, APInt(64, 0));
Value *IsNeg = Builder.CreateICmpSLT(StartIdx, Zero);
StartIdx = Builder.CreateSelect(IsNeg, Zero, StartIdx);
Value *ActualLen = Builder.CreateSub(FullLen, StartIdx);
return allocCopySubstring(Str, StartIdx, ActualLen);
}
Value *StringHandler::emitLeft(Value *Str, Value *Len) {
Value *FullLen = emitLength(Str);
Value *Zero = ConstantInt::get(Context, APInt(64, 0));
Value *IsNeg = Builder.CreateICmpSLT(Len, Zero);
Value *SafeLen = Builder.CreateSelect(IsNeg, Zero, Len);
Value *IsTooBig = Builder.CreateICmpSGT(SafeLen, FullLen);
Value *ActualLen = Builder.CreateSelect(IsTooBig, FullLen, SafeLen);
return allocCopySubstring(Str, Zero, ActualLen);
}
// Shared loop for LCASE/UCASE: malloc a copy of Str with every byte run
// through CaseFn (tolower/toupper).
Value *StringHandler::emitCaseConvert(Value *Str, FunctionCallee CaseFn) {
if (!Str) return nullptr;
Value *Len = emitLength(Str);
Value *One = ConstantInt::get(Context, APInt(64, 1));
Value *AllocSize = Builder.CreateAdd(Len, One);
Value *NewStr = Builder.CreateCall(MallocFunc, AllocSize, "case_str");
Function *TheFunction = Builder.GetInsertBlock()->getParent();
BasicBlock *LoopBB = BasicBlock::Create(Context, "loop", TheFunction);
BasicBlock *AfterBB = BasicBlock::Create(Context, "afterloop", TheFunction);
IRBuilder<> TmpB(&TheFunction->getEntryBlock(), TheFunction->getEntryBlock().begin());
AllocaInst *IdxVar = TmpB.CreateAlloca(Type::getInt64Ty(Context), nullptr, "idx");
Builder.CreateStore(ConstantInt::get(Context, APInt(64, 0)), IdxVar);
Builder.CreateBr(LoopBB);
Builder.SetInsertPoint(LoopBB);
Value *CurIdx = Builder.CreateLoad(Type::getInt64Ty(Context), IdxVar);
Value *Cond = Builder.CreateICmpSLT(CurIdx, Len);
BasicBlock *BodyBB = BasicBlock::Create(Context, "body", TheFunction);
Builder.CreateCondBr(Cond, BodyBB, AfterBB);
Builder.SetInsertPoint(BodyBB);
Value *SrcPtr = Builder.CreateInBoundsGEP(Type::getInt8Ty(Context), Str, CurIdx);
Value *CharVal = Builder.CreateLoad(Type::getInt8Ty(Context), SrcPtr);
Value *ExtChar = Builder.CreateSExt(CharVal, Type::getInt32Ty(Context));
Value *ConvChar = Builder.CreateCall(CaseFn, ExtChar);
Value *TruncChar = Builder.CreateTrunc(ConvChar, Type::getInt8Ty(Context));
Value *DestPtr = Builder.CreateInBoundsGEP(Type::getInt8Ty(Context), NewStr, CurIdx);
Builder.CreateStore(TruncChar, DestPtr);
Value *NextIdx = Builder.CreateAdd(CurIdx, One);
Builder.CreateStore(NextIdx, IdxVar);
Builder.CreateBr(LoopBB);
Builder.SetInsertPoint(AfterBB);
Value *NullPtr = Builder.CreateInBoundsGEP(Type::getInt8Ty(Context), NewStr, Len);
Builder.CreateStore(ConstantInt::get(Type::getInt8Ty(Context), 0), NullPtr);
return NewStr;
}
Value *StringHandler::emitLCase(Value *Str) {
return emitCaseConvert(Str, ToLowerFunc);
}
Value *StringHandler::emitUCase(Value *Str) {
return emitCaseConvert(Str, ToUpperFunc);
}
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