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#pragma once
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include <cstdint>
#include <functional>
#include <utility>
#include <string>
namespace cps {
class ExceptionHandler;
class RuntimeCheck {
llvm::Module &TheModule;
llvm::LLVMContext &TheContext;
llvm::IRBuilder<> &Builder;
llvm::FunctionCallee FprintfFunc;
llvm::FunctionCallee StderrFunc; // Windows: __acrt_iob_func(2)
llvm::GlobalVariable *StderrVar; // elsewhere: the C library's stderr
ExceptionHandler &Exceptions;
std::function<bool(int)> LibraryLookup;
llvm::GlobalVariable *UserLine;
llvm::Value *DivZeroMsg;
llvm::Value *OutOfBoundsMsg;
llvm::Value *EnumRangeMsg;
llvm::Value *NullDerefMsg;
llvm::Value *ArrayArgBoundsMsg;
void setupExternalFunctions();
void emitCheck(llvm::Value *Condition, llvm::Value *Msg, int Line);
public:
RuntimeCheck(llvm::Module &M, llvm::LLVMContext &C, llvm::IRBuilder<> &B,
ExceptionHandler &EH);
void setLibraryLookup(std::function<bool(int)> Lookup) { LibraryLookup = std::move(Lookup); }
llvm::Value *lineValue(int Line);
void setUserLine(int Line);
// Format a runtime diagnostic (printf-style) and write it to stderr.
void emitStderr(llvm::Value *Msg, llvm::ArrayRef<llvm::Value *> FmtArgs = {});
void emitDivZeroCheck(llvm::Value *Divisor, int Line);
void emitIndexCheck(llvm::Value *Index, llvm::Value *Lower, llvm::Value *Upper, int Line);
// Enum +/- INTEGER results must stay inside the enum's value range.
void emitEnumRangeCheck(llvm::Value *Ordinal, uint64_t ValueCount,
const std::string &TypeName, int Line);
// Dereferencing an unset (null) pointer throws instead of segfaulting.
void emitNullDerefCheck(llvm::Value *Ptr, int Line);
// A bounded array parameter is a contract: the argument's runtime bounds
// must equal the declared ones.
void emitArrayArgBoundsCheck(llvm::Value *ActualLower, llvm::Value *ActualUpper,
int64_t DeclaredLower, int64_t DeclaredUpper, int Line);
// Print the diagnostic to stderr, then throw an anonymous exception on failure.
// Runtime-computed variant: FmtArgs are the printf varargs after Msg
// (e.g. {i32 line, ptr filename}). Needed when the failure site is inside
// a synthesized helper function, where the line number is an argument
// rather than a compile-time constant.
void emitCheck(llvm::Value *Condition, llvm::Value *Msg,
llvm::ArrayRef<llvm::Value *> FmtArgs);
};
}
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