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//===-- ExceptionInfoWriter.h - Generate C++ exception info------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef TRANSFORMS_NACL_EXCEPTIONINFOWRITER_H
#define TRANSFORMS_NACL_EXCEPTIONINFOWRITER_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
namespace llvm {
// The ExceptionInfoWriter class converts the clauses of a
// "landingpad" instruction into data tables stored in global
// variables, which are interpreted by PNaCl's C++ runtime library.
// See ExceptionInfoWriter.cpp for a full description.
class ExceptionInfoWriter {
LLVMContext *Context;
StructType *ActionTableEntryTy;
// Data for populating __pnacl_eh_type_table[], which is an array of
// std::type_info* pointers. Each of these pointers represents a
// C++ exception type.
SmallVector<Constant *, 10> TypeTableData;
// Mapping from std::type_info* pointer to type ID (index in
// TypeTableData).
typedef DenseMap<Constant *, unsigned> TypeTableIDMapType;
TypeTableIDMapType TypeTableIDMap;
// Data for populating __pnacl_eh_action_table[], which is an array
// of pairs.
SmallVector<Constant *, 10> ActionTableData;
// Pair of (clause_id, clause_list_id).
typedef std::pair<unsigned, unsigned> ActionTableEntry;
// Mapping from (clause_id, clause_list_id) to clause_id (index in
// ActionTableData).
typedef DenseMap<ActionTableEntry, unsigned> ActionTableIDMapType;
ActionTableIDMapType ActionTableIDMap;
// Data for populating __pnacl_eh_filter_table[], which is an array
// of integers.
SmallVector<Constant *, 10> FilterTableData;
// Get the interned ID for an action.
unsigned getIDForClauseListNode(unsigned ClauseID, unsigned NextClauseListID);
// Get the clause ID for a "filter" clause.
unsigned getIDForFilterClause(Value *Filter);
public:
explicit ExceptionInfoWriter(LLVMContext *Context);
// Get the interned type ID (a small integer) for a C++ exception type.
unsigned getIDForExceptionType(Value *Ty);
// Get the clause list ID for a landingpad's clause list.
unsigned getIDForLandingPadClauseList(LandingPadInst *LP);
// Add the exception info tables to the module.
void defineGlobalVariables(Module *M);
};
}
#endif
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