mirror of
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2028 lines
72 KiB
C++
2028 lines
72 KiB
C++
//===-- examples/ExceptionDemo/ExceptionDemo.cpp -
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// An example use of the llvm Exception mechanism --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===--------------------------------------------------------------------===//
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//
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// Demo program which implements an example LLVM exception implementation, and
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// shows several test cases including the handling of foreign exceptions.
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// It is run with type info types arguments to throw. A test will
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// be run for each given type info type. While type info types with the value
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// of -1 will trigger a foreign C++ exception to be thrown; type info types
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// <= 6 and >= 1 will cause the associated generated exceptions to be thrown
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// and caught by generated test functions; and type info types > 6
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// will result in exceptions which pass through to the test harness. All other
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// type info types are not supported and could cause a crash. In all cases,
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// the "finally" blocks of every generated test functions will executed
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// regardless of whether or not that test function ignores or catches the
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// thrown exception.
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//
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// examples:
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//
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// ExceptionDemo
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//
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// causes a usage to be printed to stderr
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//
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// ExceptionDemo 2 3 7 -1
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//
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// results in the following cases:
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// - Value 2 causes an exception with a type info type of 2 to be
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// thrown and caught by an inner generated test function.
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// - Value 3 causes an exception with a type info type of 3 to be
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// thrown and caught by an outer generated test function.
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// - Value 7 causes an exception with a type info type of 7 to be
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// thrown and NOT be caught by any generated function.
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// - Value -1 causes a foreign C++ exception to be thrown and not be
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// caught by any generated function
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//
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// Cases -1 and 7 are caught by a C++ test harness where the validity of
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// of a C++ catch(...) clause catching a generated exception with a
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// type info type of 7 is questionable.
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//
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// This code uses code from the llvm compiler-rt project and the llvm
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// Kaleidoscope project.
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//
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//===--------------------------------------------------------------------===//
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#include "llvm/LLVMContext.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/JIT.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetSelect.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Support/IRBuilder.h"
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#include "llvm/Support/Dwarf.h"
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#include <cstdio>
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#include <string>
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#include <sstream>
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#include <map>
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#include <vector>
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#include <stdexcept>
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#ifndef USE_GLOBAL_STR_CONSTS
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#define USE_GLOBAL_STR_CONSTS true
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#endif
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// System C++ ABI unwind types from:
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// http://refspecs.freestandards.org/abi-eh-1.21.html
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extern "C" {
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typedef enum {
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_URC_NO_REASON = 0,
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_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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_URC_FATAL_PHASE2_ERROR = 2,
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_URC_FATAL_PHASE1_ERROR = 3,
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_URC_NORMAL_STOP = 4,
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_URC_END_OF_STACK = 5,
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_URC_HANDLER_FOUND = 6,
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_URC_INSTALL_CONTEXT = 7,
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_URC_CONTINUE_UNWIND = 8
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} _Unwind_Reason_Code;
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typedef enum {
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_UA_SEARCH_PHASE = 1,
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_UA_CLEANUP_PHASE = 2,
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_UA_HANDLER_FRAME = 4,
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_UA_FORCE_UNWIND = 8,
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_UA_END_OF_STACK = 16
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} _Unwind_Action;
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struct _Unwind_Exception;
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typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
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struct _Unwind_Exception *);
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struct _Unwind_Exception {
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uint64_t exception_class;
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_Unwind_Exception_Cleanup_Fn exception_cleanup;
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uintptr_t private_1;
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uintptr_t private_2;
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// @@@ The IA-64 ABI says that this structure must be double-word aligned.
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// Taking that literally does not make much sense generically. Instead
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// we provide the maximum alignment required by any type for the machine.
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} __attribute__((__aligned__));
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struct _Unwind_Context;
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typedef struct _Unwind_Context* _Unwind_Context_t;
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extern const uint8_t* _Unwind_GetLanguageSpecificData (_Unwind_Context_t c);
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extern uintptr_t _Unwind_GetGR (_Unwind_Context_t c, int i);
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extern void _Unwind_SetGR (_Unwind_Context_t c, int i, uintptr_t n);
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extern void _Unwind_SetIP (_Unwind_Context_t, uintptr_t new_value);
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extern uintptr_t _Unwind_GetIP (_Unwind_Context_t context);
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extern uintptr_t _Unwind_GetRegionStart (_Unwind_Context_t context);
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} // extern "C"
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//
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// Example types
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//
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/// This is our simplistic type info
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struct OurExceptionType_t {
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/// type info type
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int type;
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};
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/// This is our Exception class which relies on a negative offset to calculate
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/// pointers to its instances from pointers to its unwindException member.
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///
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/// Note: The above unwind.h defines struct _Unwind_Exception to be aligned
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/// on a double word boundary. This is necessary to match the standard:
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/// http://refspecs.freestandards.org/abi-eh-1.21.html
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struct OurBaseException_t {
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struct OurExceptionType_t type;
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// Note: This is properly aligned in unwind.h
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struct _Unwind_Exception unwindException;
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};
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// Note: Not needed since we are C++
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typedef struct OurBaseException_t OurException;
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typedef struct _Unwind_Exception OurUnwindException;
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//
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// Various globals used to support typeinfo and generatted exceptions in
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// general
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//
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static std::map<std::string, llvm::Value*> namedValues;
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int64_t ourBaseFromUnwindOffset;
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const unsigned char ourBaseExcpClassChars[] =
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{'o', 'b', 'j', '\0', 'b', 'a', 's', '\0'};
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static uint64_t ourBaseExceptionClass = 0;
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static std::vector<std::string> ourTypeInfoNames;
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static std::map<int, std::string> ourTypeInfoNamesIndex;
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static llvm::StructType* ourTypeInfoType;
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static llvm::StructType* ourExceptionType;
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static llvm::StructType* ourUnwindExceptionType;
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static llvm::ConstantInt* ourExceptionNotThrownState;
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static llvm::ConstantInt* ourExceptionThrownState;
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static llvm::ConstantInt* ourExceptionCaughtState;
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typedef std::vector<std::string> ArgNames;
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typedef std::vector<const llvm::Type*> ArgTypes;
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//
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// Code Generation Utilities
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//
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/// Utility used to create a function, both declarations and definitions
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/// @param module for module instance
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/// @param retType function return type
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/// @param theArgTypes function's ordered argument types
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/// @param theArgNames function's ordered arguments needed if use of this
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/// function corresponds to a function definition. Use empty
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/// aggregate for function declarations.
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/// @param functName function name
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/// @param linkage function linkage
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/// @param declarationOnly for function declarations
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/// @param isVarArg function uses vararg arguments
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/// @returns function instance
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llvm::Function *createFunction(llvm::Module& module,
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const llvm::Type* retType,
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const ArgTypes& theArgTypes,
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const ArgNames& theArgNames,
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const std::string& functName,
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llvm::GlobalValue::LinkageTypes linkage,
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bool declarationOnly,
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bool isVarArg) {
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llvm::FunctionType* functType = llvm::FunctionType::get(retType,
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theArgTypes,
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isVarArg);
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llvm::Function* ret = llvm::Function::Create(functType,
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linkage,
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functName,
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&module);
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if (!ret || declarationOnly)
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return(ret);
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namedValues.clear();
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unsigned i = 0;
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for (llvm::Function::arg_iterator argIndex = ret->arg_begin();
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i != theArgNames.size();
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++argIndex, ++i) {
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argIndex->setName(theArgNames[i]);
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namedValues[theArgNames[i]] = argIndex;
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}
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return(ret);
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}
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/// Create an alloca instruction in the entry block of
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/// the parent function. This is used for mutable variables etc.
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/// @param function parent instance
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/// @param varName stack variable name
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/// @param type stack variable type
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/// @param initWith optional constant initialization value
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/// @returns AllocaInst instance
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static llvm::AllocaInst *createEntryBlockAlloca(llvm::Function& function,
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const std::string &varName,
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const llvm::Type* type,
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llvm::Constant* initWith = NULL) {
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llvm::BasicBlock& block = function.getEntryBlock();
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llvm::IRBuilder<> tmp(&block, block.begin());
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llvm::AllocaInst* ret = tmp.CreateAlloca(type, 0, varName.c_str());
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if (initWith)
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tmp.CreateStore(initWith, ret);
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return(ret);
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}
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//
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// Code Generation Utilities End
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//
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//
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// Runtime C Library functions
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//
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// Note: using an extern "C" block so that static functions can be used
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extern "C" {
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// Note: Better ways to decide on bit width
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//
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/// Prints a 32 bit number, according to the format, to stderr.
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/// @param intToPrint integer to print
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/// @param format printf like format to use when printing
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void print32Int(int intToPrint, const char* format) {
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if (format) {
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// Note: No NULL check
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fprintf(stderr, format, intToPrint);
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}
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else {
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// Note: No NULL check
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fprintf(stderr, "::print32Int(...):NULL arg.\n");
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}
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}
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// Note: Better ways to decide on bit width
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//
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/// Prints a 64 bit number, according to the format, to stderr.
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/// @param intToPrint integer to print
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/// @param format printf like format to use when printing
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void print64Int(long int intToPrint, const char* format) {
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if (format) {
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// Note: No NULL check
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fprintf(stderr, format, intToPrint);
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}
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else {
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// Note: No NULL check
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fprintf(stderr, "::print64Int(...):NULL arg.\n");
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}
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}
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/// Prints a C string to stderr
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/// @param toPrint string to print
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void printStr(char* toPrint) {
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if (toPrint) {
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fprintf(stderr, "%s", toPrint);
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}
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else {
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fprintf(stderr, "::printStr(...):NULL arg.\n");
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}
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}
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/// Deletes the true previosly allocated exception whose address
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/// is calculated from the supplied OurBaseException_t::unwindException
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/// member address. Handles (ignores), NULL pointers.
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/// @param expToDelete exception to delete
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void deleteOurException(OurUnwindException* expToDelete) {
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#ifdef DEBUG
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fprintf(stderr,
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"deleteOurException(...).\n");
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#endif
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if (expToDelete &&
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(expToDelete->exception_class == ourBaseExceptionClass)) {
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free(((char*) expToDelete) + ourBaseFromUnwindOffset);
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}
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}
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/// This function is the struct _Unwind_Exception API mandated delete function
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/// used by foreign exception handlers when deleting our exception
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/// (OurException), instances.
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/// @param reason @link http://refspecs.freestandards.org/abi-eh-1.21.html
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/// @unlink
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/// @param expToDelete exception instance to delete
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void deleteFromUnwindOurException(_Unwind_Reason_Code reason,
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OurUnwindException* expToDelete) {
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#ifdef DEBUG
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fprintf(stderr,
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"deleteFromUnwindOurException(...).\n");
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#endif
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deleteOurException(expToDelete);
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}
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/// Creates (allocates on the heap), an exception (OurException instance),
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/// of the supplied type info type.
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/// @param type type info type
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OurUnwindException* createOurException(int type) {
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size_t size = sizeof(OurException);
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OurException* ret = (OurException*) memset(malloc(size), 0, size);
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(ret->type).type = type;
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(ret->unwindException).exception_class = ourBaseExceptionClass;
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(ret->unwindException).exception_cleanup = deleteFromUnwindOurException;
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return(&(ret->unwindException));
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}
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/// Read a uleb128 encoded value and advance pointer
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/// See Variable Length Data in:
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/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
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/// @param data reference variable holding memory pointer to decode from
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/// @returns decoded value
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static uintptr_t readULEB128(const uint8_t** data) {
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uintptr_t result = 0;
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uintptr_t shift = 0;
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unsigned char byte;
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const uint8_t* p = *data;
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do {
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byte = *p++;
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result |= (byte & 0x7f) << shift;
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shift += 7;
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}
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while (byte & 0x80);
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*data = p;
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return result;
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}
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/// Read a sleb128 encoded value and advance pointer
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/// See Variable Length Data in:
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/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
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/// @param data reference variable holding memory pointer to decode from
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/// @returns decoded value
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static uintptr_t readSLEB128(const uint8_t** data) {
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uintptr_t result = 0;
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uintptr_t shift = 0;
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unsigned char byte;
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const uint8_t* p = *data;
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do {
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byte = *p++;
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result |= (byte & 0x7f) << shift;
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shift += 7;
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}
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while (byte & 0x80);
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*data = p;
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if ((byte & 0x40) && (shift < (sizeof(result) << 3))) {
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result |= (~0 << shift);
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}
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return result;
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}
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/// Read a pointer encoded value and advance pointer
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/// See Variable Length Data in:
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/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
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/// @param data reference variable holding memory pointer to decode from
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/// @param encoding dwarf encoding type
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/// @returns decoded value
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static uintptr_t readEncodedPointer(const uint8_t** data, uint8_t encoding) {
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uintptr_t result = 0;
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const uint8_t* p = *data;
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if (encoding == llvm::dwarf::DW_EH_PE_omit)
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return(result);
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// first get value
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switch (encoding & 0x0F) {
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case llvm::dwarf::DW_EH_PE_absptr:
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result = *((uintptr_t*)p);
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p += sizeof(uintptr_t);
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break;
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case llvm::dwarf::DW_EH_PE_uleb128:
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result = readULEB128(&p);
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break;
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// Note: This case has not been tested
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case llvm::dwarf::DW_EH_PE_sleb128:
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result = readSLEB128(&p);
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break;
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case llvm::dwarf::DW_EH_PE_udata2:
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result = *((uint16_t*)p);
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p += sizeof(uint16_t);
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break;
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case llvm::dwarf::DW_EH_PE_udata4:
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result = *((uint32_t*)p);
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p += sizeof(uint32_t);
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break;
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case llvm::dwarf::DW_EH_PE_udata8:
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result = *((uint64_t*)p);
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p += sizeof(uint64_t);
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break;
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case llvm::dwarf::DW_EH_PE_sdata2:
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result = *((int16_t*)p);
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p += sizeof(int16_t);
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break;
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case llvm::dwarf::DW_EH_PE_sdata4:
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result = *((int32_t*)p);
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p += sizeof(int32_t);
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break;
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case llvm::dwarf::DW_EH_PE_sdata8:
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result = *((int64_t*)p);
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p += sizeof(int64_t);
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break;
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default:
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// not supported
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abort();
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break;
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}
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// then add relative offset
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switch (encoding & 0x70) {
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case llvm::dwarf::DW_EH_PE_absptr:
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// do nothing
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break;
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case llvm::dwarf::DW_EH_PE_pcrel:
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result += (uintptr_t)(*data);
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break;
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case llvm::dwarf::DW_EH_PE_textrel:
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case llvm::dwarf::DW_EH_PE_datarel:
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case llvm::dwarf::DW_EH_PE_funcrel:
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case llvm::dwarf::DW_EH_PE_aligned:
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default:
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// not supported
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abort();
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break;
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}
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// then apply indirection
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if (encoding & llvm::dwarf::DW_EH_PE_indirect) {
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result = *((uintptr_t*)result);
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}
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*data = p;
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return result;
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}
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/// Deals with Dwarf actions matching our type infos
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/// (OurExceptionType_t instances). Returns whether or not a dwarf emitted
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/// action matches the supplied exception type. If such a match succeeds,
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/// the resultAction argument will be set with > 0 index value. Only
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/// corresponding llvm.eh.selector type info arguments, cleanup arguments
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/// are supported. Filters are not supported.
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/// See Variable Length Data in:
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/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
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/// Also see @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
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/// @param resultAction reference variable which will be set with result
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/// @param classInfo our array of type info pointers (to globals)
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/// @param actionEntry index into above type info array or 0 (clean up).
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/// We do not support filters.
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/// @param exceptionClass exception class (_Unwind_Exception::exception_class)
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/// of thrown exception.
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/// @param exceptionObject thrown _Unwind_Exception instance.
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/// @returns whether or not a type info was found. False is returned if only
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/// a cleanup was found
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static bool handleActionValue(int64_t *resultAction,
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|
struct OurExceptionType_t **classInfo,
|
|
uintptr_t actionEntry,
|
|
uint64_t exceptionClass,
|
|
struct _Unwind_Exception *exceptionObject) {
|
|
bool ret = false;
|
|
|
|
if (!resultAction ||
|
|
!exceptionObject ||
|
|
(exceptionClass != ourBaseExceptionClass))
|
|
return(ret);
|
|
|
|
struct OurBaseException_t* excp = (struct OurBaseException_t*)
|
|
(((char*) exceptionObject) + ourBaseFromUnwindOffset);
|
|
struct OurExceptionType_t *excpType = &(excp->type);
|
|
int type = excpType->type;
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleActionValue(...): exceptionObject = <%p>, "
|
|
"excp = <%p>.\n",
|
|
exceptionObject,
|
|
excp);
|
|
#endif
|
|
|
|
const uint8_t *actionPos = (uint8_t*) actionEntry,
|
|
*tempActionPos;
|
|
int64_t typeOffset = 0,
|
|
actionOffset;
|
|
|
|
for (int i = 0; true; ++i) {
|
|
// Each emitted dwarf action corresponds to a 2 tuple of
|
|
// type info address offset, and action offset to the next
|
|
// emitted action.
|
|
typeOffset = readSLEB128(&actionPos);
|
|
tempActionPos = actionPos;
|
|
actionOffset = readSLEB128(&tempActionPos);
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleActionValue(...):typeOffset: <%lld>, "
|
|
"actionOffset: <%lld>.\n",
|
|
typeOffset,
|
|
actionOffset);
|
|
#endif
|
|
assert((typeOffset >= 0) &&
|
|
"handleActionValue(...):filters are not supported.");
|
|
|
|
// Note: A typeOffset == 0 implies that a cleanup llvm.eh.selector
|
|
// argument has been matched.
|
|
if ((typeOffset > 0) &&
|
|
(type == (classInfo[-typeOffset])->type)) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleActionValue(...):actionValue <%d> found.\n",
|
|
i);
|
|
#endif
|
|
*resultAction = i + 1;
|
|
ret = true;
|
|
break;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleActionValue(...):actionValue not found.\n");
|
|
#endif
|
|
if (!actionOffset)
|
|
break;
|
|
|
|
actionPos += actionOffset;
|
|
}
|
|
|
|
return(ret);
|
|
}
|
|
|
|
|
|
/// Deals with the Language specific data portion of the emitted dwarf code.
|
|
/// See @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
|
|
/// @param version unsupported (ignored), unwind version
|
|
/// @param lsda language specific data area
|
|
/// @param _Unwind_Action actions minimally supported unwind stage
|
|
/// (forced specifically not supported)
|
|
/// @param exceptionClass exception class (_Unwind_Exception::exception_class)
|
|
/// of thrown exception.
|
|
/// @param exceptionObject thrown _Unwind_Exception instance.
|
|
/// @param context unwind system context
|
|
/// @returns minimally supported unwinding control indicator
|
|
static _Unwind_Reason_Code handleLsda(int version,
|
|
const uint8_t* lsda,
|
|
_Unwind_Action actions,
|
|
uint64_t exceptionClass,
|
|
struct _Unwind_Exception* exceptionObject,
|
|
_Unwind_Context_t context) {
|
|
_Unwind_Reason_Code ret = _URC_CONTINUE_UNWIND;
|
|
|
|
if (!lsda)
|
|
return(ret);
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...):lsda is non-zero.\n");
|
|
#endif
|
|
|
|
// Get the current instruction pointer and offset it before next
|
|
// instruction in the current frame which threw the exception.
|
|
uintptr_t pc = _Unwind_GetIP(context)-1;
|
|
|
|
// Get beginning current frame's code (as defined by the
|
|
// emitted dwarf code)
|
|
uintptr_t funcStart = _Unwind_GetRegionStart(context);
|
|
uintptr_t pcOffset = pc - funcStart;
|
|
struct OurExceptionType_t** classInfo = NULL;
|
|
|
|
// Note: See JITDwarfEmitter::EmitExceptionTable(...) for corresponding
|
|
// dwarf emission
|
|
|
|
// Parse LSDA header.
|
|
uint8_t lpStartEncoding = *lsda++;
|
|
|
|
if (lpStartEncoding != llvm::dwarf::DW_EH_PE_omit) {
|
|
readEncodedPointer(&lsda, lpStartEncoding);
|
|
}
|
|
|
|
uint8_t ttypeEncoding = *lsda++;
|
|
uintptr_t classInfoOffset;
|
|
|
|
if (ttypeEncoding != llvm::dwarf::DW_EH_PE_omit) {
|
|
// Calculate type info locations in emitted dwarf code which
|
|
// were flagged by type info arguments to llvm.eh.selector
|
|
// intrinsic
|
|
classInfoOffset = readULEB128(&lsda);
|
|
classInfo = (struct OurExceptionType_t**) (lsda + classInfoOffset);
|
|
}
|
|
|
|
// Walk call-site table looking for range that
|
|
// includes current PC.
|
|
|
|
uint8_t callSiteEncoding = *lsda++;
|
|
uint32_t callSiteTableLength = readULEB128(&lsda);
|
|
const uint8_t* callSiteTableStart = lsda;
|
|
const uint8_t* callSiteTableEnd = callSiteTableStart +
|
|
callSiteTableLength;
|
|
const uint8_t* actionTableStart = callSiteTableEnd;
|
|
const uint8_t* callSitePtr = callSiteTableStart;
|
|
|
|
bool foreignException = false;
|
|
|
|
while (callSitePtr < callSiteTableEnd) {
|
|
uintptr_t start = readEncodedPointer(&callSitePtr,
|
|
callSiteEncoding);
|
|
uintptr_t length = readEncodedPointer(&callSitePtr,
|
|
callSiteEncoding);
|
|
uintptr_t landingPad = readEncodedPointer(&callSitePtr,
|
|
callSiteEncoding);
|
|
|
|
// Note: Action value
|
|
uintptr_t actionEntry = readULEB128(&callSitePtr);
|
|
|
|
if (exceptionClass != ourBaseExceptionClass) {
|
|
// We have been notified of a foreign exception being thrown,
|
|
// and we therefore need to execute cleanup landing pads
|
|
actionEntry = 0;
|
|
foreignException = true;
|
|
}
|
|
|
|
if (landingPad == 0) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...): No landing pad found.\n");
|
|
#endif
|
|
|
|
continue; // no landing pad for this entry
|
|
}
|
|
|
|
if (actionEntry) {
|
|
actionEntry += ((uintptr_t) actionTableStart) - 1;
|
|
}
|
|
else {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...):No action table found.\n");
|
|
#endif
|
|
}
|
|
|
|
bool exceptionMatched = false;
|
|
|
|
if ((start <= pcOffset) && (pcOffset < (start + length))) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...): Landing pad found.\n");
|
|
#endif
|
|
int64_t actionValue = 0;
|
|
|
|
if (actionEntry) {
|
|
exceptionMatched = handleActionValue
|
|
(
|
|
&actionValue,
|
|
classInfo,
|
|
actionEntry,
|
|
exceptionClass,
|
|
exceptionObject
|
|
);
|
|
}
|
|
|
|
if (!(actions & _UA_SEARCH_PHASE)) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...): installed landing pad "
|
|
"context.\n");
|
|
#endif
|
|
|
|
// Found landing pad for the PC.
|
|
// Set Instruction Pointer to so we re-enter function
|
|
// at landing pad. The landing pad is created by the
|
|
// compiler to take two parameters in registers.
|
|
_Unwind_SetGR(context,
|
|
__builtin_eh_return_data_regno(0),
|
|
(uintptr_t)exceptionObject);
|
|
|
|
// Note: this virtual register directly corresponds
|
|
// to the return of the llvm.eh.selector intrinsic
|
|
if (!actionEntry || !exceptionMatched) {
|
|
// We indicate cleanup only
|
|
_Unwind_SetGR(context,
|
|
__builtin_eh_return_data_regno(1),
|
|
0);
|
|
}
|
|
else {
|
|
// Matched type info index of llvm.eh.selector intrinsic
|
|
// passed here.
|
|
_Unwind_SetGR(context,
|
|
__builtin_eh_return_data_regno(1),
|
|
actionValue);
|
|
}
|
|
|
|
// To execute landing pad set here
|
|
_Unwind_SetIP(context, funcStart + landingPad);
|
|
ret = _URC_INSTALL_CONTEXT;
|
|
}
|
|
else if (exceptionMatched) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...): setting handler found.\n");
|
|
#endif
|
|
ret = _URC_HANDLER_FOUND;
|
|
}
|
|
else {
|
|
// Note: Only non-clean up handlers are marked as
|
|
// found. Otherwise the clean up handlers will be
|
|
// re-found and executed during the clean up
|
|
// phase.
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"handleLsda(...): cleanup handler found.\n");
|
|
#endif
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return(ret);
|
|
}
|
|
|
|
|
|
/// This is the personality function which is embedded (dwarf emitted), in the
|
|
/// dwarf unwind info block. Again see: JITDwarfEmitter.cpp.
|
|
/// See @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
|
|
/// @param version unsupported (ignored), unwind version
|
|
/// @param _Unwind_Action actions minimally supported unwind stage
|
|
/// (forced specifically not supported)
|
|
/// @param exceptionClass exception class (_Unwind_Exception::exception_class)
|
|
/// of thrown exception.
|
|
/// @param exceptionObject thrown _Unwind_Exception instance.
|
|
/// @param context unwind system context
|
|
/// @returns minimally supported unwinding control indicator
|
|
_Unwind_Reason_Code ourPersonality(int version,
|
|
_Unwind_Action actions,
|
|
uint64_t exceptionClass,
|
|
struct _Unwind_Exception* exceptionObject,
|
|
_Unwind_Context_t context) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"We are in ourPersonality(...):actions is <%d>.\n",
|
|
actions);
|
|
|
|
if (actions & _UA_SEARCH_PHASE) {
|
|
fprintf(stderr, "ourPersonality(...):In search phase.\n");
|
|
}
|
|
else {
|
|
fprintf(stderr, "ourPersonality(...):In non-search phase.\n");
|
|
}
|
|
#endif
|
|
|
|
const uint8_t* lsda = _Unwind_GetLanguageSpecificData(context);
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"ourPersonality(...):lsda = <%p>.\n",
|
|
lsda);
|
|
#endif
|
|
|
|
// The real work of the personality function is captured here
|
|
return(handleLsda(version,
|
|
lsda,
|
|
actions,
|
|
exceptionClass,
|
|
exceptionObject,
|
|
context));
|
|
}
|
|
|
|
|
|
/// Generates our _Unwind_Exception class from a given character array.
|
|
/// thereby handling arbitrary lengths (not in standard), and handling
|
|
/// embedded \0s.
|
|
/// See @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
|
|
/// @param classChars char array to encode. NULL values not checkedf
|
|
/// @param classCharsSize number of chars in classChars. Value is not checked.
|
|
/// @returns class value
|
|
uint64_t genClass(const unsigned char classChars[], size_t classCharsSize)
|
|
{
|
|
uint64_t ret = classChars[0];
|
|
|
|
for (unsigned i = 1; i < classCharsSize; ++i) {
|
|
ret <<= 8;
|
|
ret += classChars[i];
|
|
}
|
|
|
|
return(ret);
|
|
}
|
|
|
|
} // extern "C"
|
|
|
|
//
|
|
// Runtime C Library functions End
|
|
//
|
|
|
|
//
|
|
// Code generation functions
|
|
//
|
|
|
|
/// Generates code to print given constant string
|
|
/// @param context llvm context
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param toPrint string to print
|
|
/// @param useGlobal A value of true (default) indicates a GlobalValue is
|
|
/// generated, and is used to hold the constant string. A value of
|
|
/// false indicates that the constant string will be stored on the
|
|
/// stack.
|
|
void generateStringPrint(llvm::LLVMContext& context,
|
|
llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
std::string toPrint,
|
|
bool useGlobal = true) {
|
|
llvm::Function *printFunct = module.getFunction("printStr");
|
|
|
|
llvm::Value *stringVar;
|
|
llvm::Constant* stringConstant =
|
|
llvm::ConstantArray::get(context, toPrint);
|
|
|
|
if (useGlobal) {
|
|
// Note: Does not work without allocation
|
|
stringVar =
|
|
new llvm::GlobalVariable(module,
|
|
stringConstant->getType(),
|
|
true,
|
|
llvm::GlobalValue::LinkerPrivateLinkage,
|
|
stringConstant,
|
|
"");
|
|
}
|
|
else {
|
|
stringVar = builder.CreateAlloca(stringConstant->getType());
|
|
builder.CreateStore(stringConstant, stringVar);
|
|
}
|
|
|
|
llvm::Value* cast =
|
|
builder.CreatePointerCast(stringVar,
|
|
builder.getInt8Ty()->getPointerTo());
|
|
builder.CreateCall(printFunct, cast);
|
|
}
|
|
|
|
|
|
/// Generates code to print given runtime integer according to constant
|
|
/// string format, and a given print function.
|
|
/// @param context llvm context
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param printFunct function used to "print" integer
|
|
/// @param toPrint string to print
|
|
/// @param format printf like formating string for print
|
|
/// @param useGlobal A value of true (default) indicates a GlobalValue is
|
|
/// generated, and is used to hold the constant string. A value of
|
|
/// false indicates that the constant string will be stored on the
|
|
/// stack.
|
|
void generateIntegerPrint(llvm::LLVMContext& context,
|
|
llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
llvm::Function& printFunct,
|
|
llvm::Value& toPrint,
|
|
std::string format,
|
|
bool useGlobal = true) {
|
|
llvm::Constant *stringConstant = llvm::ConstantArray::get(context, format);
|
|
llvm::Value *stringVar;
|
|
|
|
if (useGlobal) {
|
|
// Note: Does not seem to work without allocation
|
|
stringVar =
|
|
new llvm::GlobalVariable(module,
|
|
stringConstant->getType(),
|
|
true,
|
|
llvm::GlobalValue::LinkerPrivateLinkage,
|
|
stringConstant,
|
|
"");
|
|
}
|
|
else {
|
|
stringVar = builder.CreateAlloca(stringConstant->getType());
|
|
builder.CreateStore(stringConstant, stringVar);
|
|
}
|
|
|
|
llvm::Value* cast =
|
|
builder.CreateBitCast(stringVar,
|
|
builder.getInt8Ty()->getPointerTo());
|
|
builder.CreateCall2(&printFunct, &toPrint, cast);
|
|
}
|
|
|
|
|
|
/// Generates code to handle finally block type semantics: always runs
|
|
/// regardless of whether a thrown exception is passing through or the
|
|
/// parent function is simply exiting. In addition to printing some state
|
|
/// to stderr, this code will resume the exception handling--runs the
|
|
/// unwind resume block, if the exception has not been previously caught
|
|
/// by a catch clause, and will otherwise execute the end block (terminator
|
|
/// block). In addition this function creates the corresponding function's
|
|
/// stack storage for the exception pointer and catch flag status.
|
|
/// @param context llvm context
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param toAddTo parent function to add block to
|
|
/// @param blockName block name of new "finally" block.
|
|
/// @param functionId output id used for printing
|
|
/// @param terminatorBlock terminator "end" block
|
|
/// @param unwindResumeBlock unwind resume block
|
|
/// @param exceptionCaughtFlag reference exception caught/thrown status storage
|
|
/// @param exceptionStorage reference to exception pointer storage
|
|
/// @returns newly created block
|
|
static llvm::BasicBlock* createFinallyBlock(llvm::LLVMContext& context,
|
|
llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
llvm::Function& toAddTo,
|
|
std::string& blockName,
|
|
std::string& functionId,
|
|
llvm::BasicBlock& terminatorBlock,
|
|
llvm::BasicBlock& unwindResumeBlock,
|
|
llvm::Value** exceptionCaughtFlag,
|
|
llvm::Value** exceptionStorage) {
|
|
assert(exceptionCaughtFlag &&
|
|
"ExceptionDemo::createFinallyBlock(...):exceptionCaughtFlag "
|
|
"is NULL");
|
|
assert(exceptionStorage &&
|
|
"ExceptionDemo::createFinallyBlock(...):exceptionStorage "
|
|
"is NULL");
|
|
|
|
*exceptionCaughtFlag =
|
|
createEntryBlockAlloca(toAddTo,
|
|
"exceptionCaught",
|
|
ourExceptionNotThrownState->getType(),
|
|
ourExceptionNotThrownState);
|
|
|
|
const llvm::PointerType* exceptionStorageType =
|
|
builder.getInt8Ty()->getPointerTo();
|
|
*exceptionStorage =
|
|
createEntryBlockAlloca(toAddTo,
|
|
"exceptionStorage",
|
|
exceptionStorageType,
|
|
llvm::ConstantPointerNull::get(
|
|
exceptionStorageType));
|
|
|
|
llvm::BasicBlock *ret = llvm::BasicBlock::Create(context,
|
|
blockName,
|
|
&toAddTo);
|
|
|
|
builder.SetInsertPoint(ret);
|
|
|
|
std::ostringstream bufferToPrint;
|
|
bufferToPrint << "Gen: Executing finally block "
|
|
<< blockName
|
|
<< " in "
|
|
<< functionId
|
|
<< std::endl;
|
|
generateStringPrint(context,
|
|
module,
|
|
builder,
|
|
bufferToPrint.str(),
|
|
USE_GLOBAL_STR_CONSTS);
|
|
|
|
llvm::SwitchInst* theSwitch =
|
|
builder.CreateSwitch(builder.CreateLoad(*exceptionCaughtFlag),
|
|
&terminatorBlock,
|
|
2);
|
|
theSwitch->addCase(ourExceptionCaughtState, &terminatorBlock);
|
|
theSwitch->addCase(ourExceptionThrownState, &unwindResumeBlock);
|
|
|
|
return(ret);
|
|
}
|
|
|
|
|
|
/// Generates catch block semantics which print a string to indicate type of
|
|
/// catch executed, sets an exception caught flag, and executes passed in
|
|
/// end block (terminator block).
|
|
/// @param context llvm context
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param toAddTo parent function to add block to
|
|
/// @param blockName block name of new "catch" block.
|
|
/// @param functionId output id used for printing
|
|
/// @param terminatorBlock terminator "end" block
|
|
/// @param exceptionCaughtFlag exception caught/thrown status
|
|
/// @returns newly created block
|
|
static llvm::BasicBlock* createCatchBlock(llvm::LLVMContext& context,
|
|
llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
llvm::Function& toAddTo,
|
|
std::string& blockName,
|
|
std::string& functionId,
|
|
llvm::BasicBlock& terminatorBlock,
|
|
llvm::Value& exceptionCaughtFlag) {
|
|
|
|
llvm::BasicBlock *ret = llvm::BasicBlock::Create(context,
|
|
blockName,
|
|
&toAddTo);
|
|
|
|
builder.SetInsertPoint(ret);
|
|
|
|
std::ostringstream bufferToPrint;
|
|
bufferToPrint << "Gen: Executing catch block "
|
|
<< blockName
|
|
<< " in "
|
|
<< functionId
|
|
<< std::endl;
|
|
generateStringPrint(context,
|
|
module,
|
|
builder,
|
|
bufferToPrint.str(),
|
|
USE_GLOBAL_STR_CONSTS);
|
|
builder.CreateStore(ourExceptionCaughtState, &exceptionCaughtFlag);
|
|
builder.CreateBr(&terminatorBlock);
|
|
|
|
return(ret);
|
|
}
|
|
|
|
|
|
/// Generates a function which invokes a function (toInvoke) and, whose
|
|
/// unwind block will "catch" the type info types correspondingly held in the
|
|
/// exceptionTypesToCatch argument. If the toInvoke function throws an
|
|
/// exception which does not match any type info types contained in
|
|
/// exceptionTypesToCatch, the generated code will call _Unwind_Resume
|
|
/// with the raised exception. On the other hand the generated code will
|
|
/// normally exit if the toInvoke function does not throw an exception.
|
|
/// The generated "finally" block is always run regardless of the cause of
|
|
/// the generated function exit.
|
|
/// The generated function is returned after being verified.
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param fpm a function pass manager holding optional IR to IR
|
|
/// transformations
|
|
/// @param toInvoke inner function to invoke
|
|
/// @param ourId id used to printing purposes
|
|
/// @param numExceptionsToCatch length of exceptionTypesToCatch array
|
|
/// @param exceptionTypesToCatch array of type info types to "catch"
|
|
/// @returns generated function
|
|
static
|
|
llvm::Function* createCatchWrappedInvokeFunction(llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
llvm::FunctionPassManager& fpm,
|
|
llvm::Function& toInvoke,
|
|
std::string ourId,
|
|
unsigned numExceptionsToCatch,
|
|
unsigned exceptionTypesToCatch[]) {
|
|
|
|
llvm::LLVMContext& context = module.getContext();
|
|
llvm::Function *toPrint32Int = module.getFunction("print32Int");
|
|
|
|
ArgTypes argTypes;
|
|
argTypes.push_back(builder.getInt32Ty());
|
|
|
|
ArgNames argNames;
|
|
argNames.push_back("exceptTypeToThrow");
|
|
|
|
llvm::Function* ret = createFunction(module,
|
|
builder.getVoidTy(),
|
|
argTypes,
|
|
argNames,
|
|
ourId,
|
|
llvm::Function::ExternalLinkage,
|
|
false,
|
|
false);
|
|
|
|
// Block which calls invoke
|
|
llvm::BasicBlock *entryBlock = llvm::BasicBlock::Create(context,
|
|
"entry",
|
|
ret);
|
|
// Normal block for invoke
|
|
llvm::BasicBlock *normalBlock = llvm::BasicBlock::Create(context,
|
|
"normal",
|
|
ret);
|
|
// Unwind block for invoke
|
|
llvm::BasicBlock *exceptionBlock =
|
|
llvm::BasicBlock::Create(context, "exception", ret);
|
|
|
|
// Block which routes exception to correct catch handler block
|
|
llvm::BasicBlock *exceptionRouteBlock =
|
|
llvm::BasicBlock::Create(context, "exceptionRoute", ret);
|
|
|
|
// Foreign exception handler
|
|
llvm::BasicBlock *externalExceptionBlock =
|
|
llvm::BasicBlock::Create(context, "externalException", ret);
|
|
|
|
// Block which calls _Unwind_Resume
|
|
llvm::BasicBlock *unwindResumeBlock =
|
|
llvm::BasicBlock::Create(context, "unwindResume", ret);
|
|
|
|
// Clean up block which delete exception if needed
|
|
llvm::BasicBlock *endBlock =
|
|
llvm::BasicBlock::Create(context, "end", ret);
|
|
|
|
std::string nextName;
|
|
std::vector<llvm::BasicBlock*> catchBlocks(numExceptionsToCatch);
|
|
llvm::Value* exceptionCaughtFlag = NULL;
|
|
llvm::Value* exceptionStorage = NULL;
|
|
|
|
// Finally block which will branch to unwindResumeBlock if
|
|
// exception is not caught. Initializes/allocates stack locations.
|
|
llvm::BasicBlock* finallyBlock = createFinallyBlock(context,
|
|
module,
|
|
builder,
|
|
*ret,
|
|
nextName = "finally",
|
|
ourId,
|
|
*endBlock,
|
|
*unwindResumeBlock,
|
|
&exceptionCaughtFlag,
|
|
&exceptionStorage);
|
|
|
|
for (unsigned i = 0; i < numExceptionsToCatch; ++i) {
|
|
nextName = ourTypeInfoNames[exceptionTypesToCatch[i]];
|
|
|
|
// One catch block per type info to be caught
|
|
catchBlocks[i] = createCatchBlock(context,
|
|
module,
|
|
builder,
|
|
*ret,
|
|
nextName,
|
|
ourId,
|
|
*finallyBlock,
|
|
*exceptionCaughtFlag);
|
|
}
|
|
|
|
// Entry Block
|
|
|
|
builder.SetInsertPoint(entryBlock);
|
|
|
|
std::vector<llvm::Value*> args;
|
|
args.push_back(namedValues["exceptTypeToThrow"]);
|
|
builder.CreateInvoke(&toInvoke,
|
|
normalBlock,
|
|
exceptionBlock,
|
|
args.begin(),
|
|
args.end());
|
|
|
|
// End Block
|
|
|
|
builder.SetInsertPoint(endBlock);
|
|
|
|
generateStringPrint(context,
|
|
module,
|
|
builder,
|
|
"Gen: In end block: exiting in " + ourId + ".\n",
|
|
USE_GLOBAL_STR_CONSTS);
|
|
llvm::Function *deleteOurException =
|
|
module.getFunction("deleteOurException");
|
|
|
|
// Note: function handles NULL exceptions
|
|
builder.CreateCall(deleteOurException,
|
|
builder.CreateLoad(exceptionStorage));
|
|
builder.CreateRetVoid();
|
|
|
|
// Normal Block
|
|
|
|
builder.SetInsertPoint(normalBlock);
|
|
|
|
generateStringPrint(context,
|
|
module,
|
|
builder,
|
|
"Gen: No exception in " + ourId + "!\n",
|
|
USE_GLOBAL_STR_CONSTS);
|
|
|
|
// Finally block is always called
|
|
builder.CreateBr(finallyBlock);
|
|
|
|
// Unwind Resume Block
|
|
|
|
builder.SetInsertPoint(unwindResumeBlock);
|
|
|
|
llvm::Function *resumeOurException =
|
|
module.getFunction("_Unwind_Resume");
|
|
builder.CreateCall(resumeOurException,
|
|
builder.CreateLoad(exceptionStorage));
|
|
builder.CreateUnreachable();
|
|
|
|
// Exception Block
|
|
|
|
builder.SetInsertPoint(exceptionBlock);
|
|
|
|
llvm::Function *ehException = module.getFunction("llvm.eh.exception");
|
|
|
|
// Retrieve thrown exception
|
|
llvm::Value* unwindException = builder.CreateCall(ehException);
|
|
|
|
// Store exception and flag
|
|
builder.CreateStore(unwindException, exceptionStorage);
|
|
builder.CreateStore(ourExceptionThrownState, exceptionCaughtFlag);
|
|
llvm::Function *personality = module.getFunction("ourPersonality");
|
|
llvm::Value* functPtr =
|
|
builder.CreatePointerCast(personality,
|
|
builder.getInt8Ty()->getPointerTo());
|
|
|
|
args.clear();
|
|
args.push_back(unwindException);
|
|
args.push_back(functPtr);
|
|
|
|
// Note: Skipping index 0
|
|
for (unsigned i = 0; i < numExceptionsToCatch; ++i) {
|
|
// Set up type infos to be caught
|
|
args.push_back(
|
|
module.getGlobalVariable(
|
|
ourTypeInfoNames[exceptionTypesToCatch[i]]));
|
|
}
|
|
|
|
args.push_back(llvm::ConstantInt::get(builder.getInt32Ty(), 0));
|
|
|
|
llvm::Function *ehSelector = module.getFunction("llvm.eh.selector");
|
|
|
|
// Set up this exeption block as the landing pad which will handle
|
|
// given type infos. See case Intrinsic::eh_selector in
|
|
// SelectionDAGBuilder::visitIntrinsicCall(...) and AddCatchInfo(...)
|
|
// implemented in FunctionLoweringInfo.cpp to see how the implementation
|
|
// handles this call. This landing pad (this exception block), will be
|
|
// called either because it nees to cleanup (call finally) or a type
|
|
// info was found which matched the thrown exception.
|
|
llvm::Value* retTypeInfoIndex = builder.CreateCall(ehSelector,
|
|
args.begin(),
|
|
args.end());
|
|
|
|
// Retrieve exception_class member from thrown exception
|
|
// (_Unwind_Exception instance). This member tells us whether or not
|
|
// the exception is foreign.
|
|
llvm::Value* unwindExceptionClass =
|
|
builder.CreateLoad(
|
|
builder.CreateStructGEP(
|
|
builder.CreatePointerCast(
|
|
unwindException,
|
|
ourUnwindExceptionType->getPointerTo()),
|
|
0));
|
|
|
|
// Branch to the externalExceptionBlock if the exception is foreign or
|
|
// to a catch router if not. Either way the finally block will be run.
|
|
builder.CreateCondBr(
|
|
builder.CreateICmpEQ(unwindExceptionClass,
|
|
llvm::ConstantInt::get(builder.getInt64Ty(),
|
|
ourBaseExceptionClass)),
|
|
exceptionRouteBlock,
|
|
externalExceptionBlock);
|
|
|
|
// External Exception Block
|
|
|
|
builder.SetInsertPoint(externalExceptionBlock);
|
|
|
|
generateStringPrint(context,
|
|
module,
|
|
builder,
|
|
"Gen: Foreign exception received.\n",
|
|
USE_GLOBAL_STR_CONSTS);
|
|
|
|
// Branch to the finally block
|
|
builder.CreateBr(finallyBlock);
|
|
|
|
// Exception Route Block
|
|
|
|
builder.SetInsertPoint(exceptionRouteBlock);
|
|
|
|
// Casts exception pointer (_Unwind_Exception instance) to parent
|
|
// (OurException instance).
|
|
//
|
|
// Note: ourBaseFromUnwindOffset is usually negative
|
|
llvm::Value* typeInfoThrown =
|
|
builder.CreatePointerCast(
|
|
builder.CreateConstGEP1_64(unwindException,
|
|
ourBaseFromUnwindOffset),
|
|
ourExceptionType->getPointerTo());
|
|
|
|
// Retrieve thrown exception type info type
|
|
//
|
|
// Note: Index is not relative to pointer but instead to structure
|
|
// unlike a true getelementptr (GEP) instruction
|
|
typeInfoThrown = builder.CreateStructGEP(typeInfoThrown, 0);
|
|
|
|
llvm::Value* typeInfoThrownType =
|
|
builder.CreateStructGEP(typeInfoThrown, 0);
|
|
|
|
generateIntegerPrint(context,
|
|
module,
|
|
builder,
|
|
*toPrint32Int,
|
|
*(builder.CreateLoad(typeInfoThrownType)),
|
|
"Gen: Exception type <%d> received (stack unwound) "
|
|
" in " +
|
|
ourId +
|
|
".\n",
|
|
USE_GLOBAL_STR_CONSTS);
|
|
|
|
// Route to matched type info catch block or run cleanup finally block
|
|
llvm::SwitchInst* switchToCatchBlock =
|
|
builder.CreateSwitch(retTypeInfoIndex,
|
|
finallyBlock,
|
|
numExceptionsToCatch);
|
|
|
|
unsigned nextTypeToCatch;
|
|
|
|
for (unsigned i = 1; i <= numExceptionsToCatch; ++i) {
|
|
nextTypeToCatch = i - 1;
|
|
switchToCatchBlock->addCase(llvm::ConstantInt::get(
|
|
llvm::Type::getInt32Ty(context),
|
|
i),
|
|
catchBlocks[nextTypeToCatch]);
|
|
}
|
|
|
|
llvm::verifyFunction(*ret);
|
|
fpm.run(*ret);
|
|
|
|
return(ret);
|
|
}
|
|
|
|
|
|
/// Generates function which throws either an exception matched to a runtime
|
|
/// determined type info type (argument to generated function), or if this
|
|
/// runtime value matches nativeThrowType, throws a foreign exception by
|
|
/// calling nativeThrowFunct.
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param fpm a function pass manager holding optional IR to IR
|
|
/// transformations
|
|
/// @param ourId id used to printing purposes
|
|
/// @param nativeThrowType a runtime argument of this value results in
|
|
/// nativeThrowFunct being called to generate/throw exception.
|
|
/// @param nativeThrowFunct function which will throw a foreign exception
|
|
/// if the above nativeThrowType matches generated function's arg.
|
|
/// @returns generated function
|
|
static
|
|
llvm::Function* createThrowExceptionFunction(llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
llvm::FunctionPassManager& fpm,
|
|
std::string ourId,
|
|
int32_t nativeThrowType,
|
|
llvm::Function& nativeThrowFunct) {
|
|
llvm::LLVMContext& context = module.getContext();
|
|
namedValues.clear();
|
|
ArgTypes unwindArgTypes;
|
|
unwindArgTypes.push_back(builder.getInt32Ty());
|
|
ArgNames unwindArgNames;
|
|
unwindArgNames.push_back("exceptTypeToThrow");
|
|
|
|
llvm::Function *ret = createFunction(module,
|
|
builder.getVoidTy(),
|
|
unwindArgTypes,
|
|
unwindArgNames,
|
|
ourId,
|
|
llvm::Function::ExternalLinkage,
|
|
false,
|
|
false);
|
|
|
|
// Throws either one of our exception or a native C++ exception depending
|
|
// on a runtime argument value containing a type info type.
|
|
llvm::BasicBlock *entryBlock = llvm::BasicBlock::Create(context,
|
|
"entry",
|
|
ret);
|
|
// Throws a foreign exception
|
|
llvm::BasicBlock *nativeThrowBlock =
|
|
llvm::BasicBlock::Create(context,
|
|
"nativeThrow",
|
|
ret);
|
|
// Throws one of our Exceptions
|
|
llvm::BasicBlock *generatedThrowBlock =
|
|
llvm::BasicBlock::Create(context,
|
|
"generatedThrow",
|
|
ret);
|
|
// Retrieved runtime type info type to throw
|
|
llvm::Value* exceptionType = namedValues["exceptTypeToThrow"];
|
|
|
|
// nativeThrowBlock block
|
|
|
|
builder.SetInsertPoint(nativeThrowBlock);
|
|
|
|
// Throws foreign exception
|
|
builder.CreateCall(&nativeThrowFunct, exceptionType);
|
|
builder.CreateUnreachable();
|
|
|
|
// entry block
|
|
|
|
builder.SetInsertPoint(entryBlock);
|
|
|
|
llvm::Function *toPrint32Int = module.getFunction("print32Int");
|
|
generateIntegerPrint(context,
|
|
module,
|
|
builder,
|
|
*toPrint32Int,
|
|
*exceptionType,
|
|
"\nGen: About to throw exception type <%d> in " +
|
|
ourId +
|
|
".\n",
|
|
USE_GLOBAL_STR_CONSTS);
|
|
|
|
// Switches on runtime type info type value to determine whether or not
|
|
// a foreign exception is thrown. Defaults to throwing one of our
|
|
// generated exceptions.
|
|
llvm::SwitchInst* theSwitch = builder.CreateSwitch(exceptionType,
|
|
generatedThrowBlock,
|
|
1);
|
|
|
|
theSwitch->addCase(llvm::ConstantInt::get(llvm::Type::getInt32Ty(context),
|
|
nativeThrowType),
|
|
nativeThrowBlock);
|
|
|
|
// generatedThrow block
|
|
|
|
builder.SetInsertPoint(generatedThrowBlock);
|
|
|
|
llvm::Function *createOurException =
|
|
module.getFunction("createOurException");
|
|
llvm::Function *raiseOurException =
|
|
module.getFunction("_Unwind_RaiseException");
|
|
|
|
// Creates exception to throw with runtime type info type.
|
|
llvm::Value* exception =
|
|
builder.CreateCall(createOurException,
|
|
namedValues["exceptTypeToThrow"]);
|
|
|
|
// Throw generated Exception
|
|
builder.CreateCall(raiseOurException, exception);
|
|
builder.CreateUnreachable();
|
|
|
|
llvm::verifyFunction(*ret);
|
|
fpm.run(*ret);
|
|
|
|
return(ret);
|
|
}
|
|
|
|
static void createStandardUtilityFunctions(unsigned numTypeInfos,
|
|
llvm::Module& module,
|
|
llvm::IRBuilder<>& builder);
|
|
|
|
/// Creates test code by generating and organizing these functions into the
|
|
/// test case. The test case consists of an outer function setup to invoke
|
|
/// an inner function within an environment having multiple catch and single
|
|
/// finally blocks. This inner function is also setup to invoke a throw
|
|
/// function within an evironment similar in nature to the outer function's
|
|
/// catch and finally blocks. Each of these two functions catch mutually
|
|
/// exclusive subsets (even or odd) of the type info types configured
|
|
/// for this this. All generated functions have a runtime argument which
|
|
/// holds a type info type to throw that each function takes and passes it
|
|
/// to the inner one if such a inner function exists. This type info type is
|
|
/// looked at by the generated throw function to see whether or not it should
|
|
/// throw a generated exception with the same type info type, or instead call
|
|
/// a supplied a function which in turn will throw a foreign exception.
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
/// @param fpm a function pass manager holding optional IR to IR
|
|
/// transformations
|
|
/// @param nativeThrowFunctName name of external function which will throw
|
|
/// a foreign exception
|
|
/// @returns outermost generated test function.
|
|
llvm::Function* createUnwindExceptionTest(llvm::Module& module,
|
|
llvm::IRBuilder<>& builder,
|
|
llvm::FunctionPassManager& fpm,
|
|
std::string nativeThrowFunctName) {
|
|
// Number of type infos to generate
|
|
unsigned numTypeInfos = 6;
|
|
|
|
// Initialze intrisics and external functions to use along with exception
|
|
// and type info globals.
|
|
createStandardUtilityFunctions(numTypeInfos,
|
|
module,
|
|
builder);
|
|
llvm::Function *nativeThrowFunct =
|
|
module.getFunction(nativeThrowFunctName);
|
|
|
|
// Create exception throw function using the value ~0 to cause
|
|
// foreign exceptions to be thrown.
|
|
llvm::Function* throwFunct =
|
|
createThrowExceptionFunction(module,
|
|
builder,
|
|
fpm,
|
|
"throwFunct",
|
|
~0,
|
|
*nativeThrowFunct);
|
|
// Inner function will catch even type infos
|
|
unsigned innerExceptionTypesToCatch[] = {6, 2, 4};
|
|
size_t numExceptionTypesToCatch = sizeof(innerExceptionTypesToCatch) /
|
|
sizeof(unsigned);
|
|
|
|
// Generate inner function.
|
|
llvm::Function* innerCatchFunct =
|
|
createCatchWrappedInvokeFunction(module,
|
|
builder,
|
|
fpm,
|
|
*throwFunct,
|
|
"innerCatchFunct",
|
|
numExceptionTypesToCatch,
|
|
innerExceptionTypesToCatch);
|
|
|
|
// Outer function will catch odd type infos
|
|
unsigned outerExceptionTypesToCatch[] = {3, 1, 5};
|
|
numExceptionTypesToCatch = sizeof(outerExceptionTypesToCatch) /
|
|
sizeof(unsigned);
|
|
|
|
// Generate outer function
|
|
llvm::Function* outerCatchFunct =
|
|
createCatchWrappedInvokeFunction(module,
|
|
builder,
|
|
fpm,
|
|
*innerCatchFunct,
|
|
"outerCatchFunct",
|
|
numExceptionTypesToCatch,
|
|
outerExceptionTypesToCatch);
|
|
|
|
// Return outer function to run
|
|
return(outerCatchFunct);
|
|
}
|
|
|
|
|
|
/// Represents our foreign exceptions
|
|
class OurCppRunException : public std::runtime_error {
|
|
public:
|
|
OurCppRunException(const std::string reason) :
|
|
std::runtime_error(reason) {}
|
|
|
|
OurCppRunException (const OurCppRunException& toCopy) :
|
|
std::runtime_error(toCopy) {}
|
|
|
|
OurCppRunException& operator = (const OurCppRunException& toCopy) {
|
|
return(reinterpret_cast<OurCppRunException&>(
|
|
std::runtime_error::operator = (toCopy)
|
|
));
|
|
}
|
|
|
|
~OurCppRunException (void) throw () {}
|
|
};
|
|
|
|
|
|
/// Throws foreign C++ exception.
|
|
/// @param ignoreIt unused parameter that allows function to match implied
|
|
/// generated function contract.
|
|
extern "C"
|
|
void throwCppException (int32_t ignoreIt) {
|
|
throw(OurCppRunException("thrown by throwCppException(...)"));
|
|
}
|
|
|
|
typedef void (*OurExceptionThrowFunctType) (int32_t typeToThrow);
|
|
|
|
/// This is a test harness which runs test by executing generated
|
|
/// function with a type info type to throw. Harness wraps the excecution
|
|
/// of generated function in a C++ try catch clause.
|
|
/// @param engine execution engine to use for executing generated function.
|
|
/// This demo program expects this to be a JIT instance for demo
|
|
/// purposes.
|
|
/// @param function generated test function to run
|
|
/// @param typeToThrow type info type of generated exception to throw, or
|
|
/// indicator to cause foreign exception to be thrown.
|
|
static
|
|
void runExceptionThrow(llvm::ExecutionEngine* engine,
|
|
llvm::Function* function,
|
|
int32_t typeToThrow) {
|
|
|
|
// Find test's function pointer
|
|
OurExceptionThrowFunctType functPtr =
|
|
reinterpret_cast<OurExceptionThrowFunctType>(
|
|
reinterpret_cast<intptr_t>(
|
|
engine->getPointerToFunction(function)
|
|
)
|
|
);
|
|
|
|
try {
|
|
// Run test
|
|
(*functPtr)(typeToThrow);
|
|
}
|
|
catch (OurCppRunException exc) {
|
|
// Catch foreign C++ exception
|
|
fprintf(stderr,
|
|
"\nrunExceptionThrow(...):In C++ catch OurCppRunException "
|
|
"with reason: %s.\n",
|
|
exc.what());
|
|
}
|
|
catch (...) {
|
|
// Catch all exceptions including our generated ones. I'm not sure
|
|
// why this latter functionality should work, as it seems that
|
|
// our exceptions should be foreign to C++ (the _Unwind_Exception::
|
|
// exception_class should be different from the one used by C++), and
|
|
// therefore C++ should ignore the generated exceptions.
|
|
|
|
fprintf(stderr,
|
|
"\nrunExceptionThrow(...):In C++ catch all.\n");
|
|
}
|
|
}
|
|
|
|
//
|
|
// End test functions
|
|
//
|
|
|
|
/// This initialization routine creates type info globals and
|
|
/// adds external function declarations to module.
|
|
/// @param numTypeInfos number of linear type info associated type info types
|
|
/// to create as GlobalVariable instances, starting with the value 1.
|
|
/// @param module code for module instance
|
|
/// @param builder builder instance
|
|
static void createStandardUtilityFunctions(unsigned numTypeInfos,
|
|
llvm::Module& module,
|
|
llvm::IRBuilder<>& builder) {
|
|
|
|
llvm::LLVMContext& context = module.getContext();
|
|
|
|
// Exception initializations
|
|
|
|
// Setup exception catch state
|
|
ourExceptionNotThrownState =
|
|
llvm::ConstantInt::get(llvm::Type::getInt8Ty(context), 0),
|
|
ourExceptionThrownState =
|
|
llvm::ConstantInt::get(llvm::Type::getInt8Ty(context), 1),
|
|
ourExceptionCaughtState =
|
|
llvm::ConstantInt::get(llvm::Type::getInt8Ty(context), 2),
|
|
|
|
|
|
// Create our type info type
|
|
ourTypeInfoType = llvm::StructType::get(context,
|
|
builder.getInt32Ty(),
|
|
NULL);
|
|
|
|
// Create OurException type
|
|
ourExceptionType = llvm::StructType::get(context,
|
|
ourTypeInfoType,
|
|
NULL);
|
|
|
|
// Create portion of _Unwind_Exception type
|
|
//
|
|
// Note: Declaring only a portion of the _Unwind_Exception struct.
|
|
// Does this cause problems?
|
|
ourUnwindExceptionType = llvm::StructType::get(context,
|
|
builder.getInt64Ty(),
|
|
NULL);
|
|
struct OurBaseException_t dummyException;
|
|
|
|
// Calculate offset of OurException::unwindException member.
|
|
ourBaseFromUnwindOffset = ((uintptr_t) &dummyException) -
|
|
((uintptr_t) &(dummyException.unwindException));
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr,
|
|
"createStandardUtilityFunctions(...):ourBaseFromUnwindOffset "
|
|
"= %lld, sizeof(struct OurBaseException_t) - "
|
|
"sizeof(struct _Unwind_Exception) = %lu.\n",
|
|
ourBaseFromUnwindOffset,
|
|
sizeof(struct OurBaseException_t) -
|
|
sizeof(struct _Unwind_Exception));
|
|
#endif
|
|
|
|
size_t numChars = sizeof(ourBaseExcpClassChars) / sizeof(char);
|
|
|
|
// Create our _Unwind_Exception::exception_class value
|
|
ourBaseExceptionClass = genClass(ourBaseExcpClassChars, numChars);
|
|
|
|
// Type infos
|
|
|
|
std::string baseStr = "typeInfo", typeInfoName;
|
|
std::ostringstream typeInfoNameBuilder;
|
|
std::vector<llvm::Constant*> structVals;
|
|
|
|
llvm::Constant *nextStruct;
|
|
llvm::GlobalVariable* nextGlobal = NULL;
|
|
|
|
// Generate each type info
|
|
//
|
|
// Note: First type info is not used.
|
|
for (unsigned i = 0; i <= numTypeInfos; ++i) {
|
|
structVals.clear();
|
|
structVals.push_back(llvm::ConstantInt::get(builder.getInt32Ty(), i));
|
|
nextStruct = llvm::ConstantStruct::get(ourTypeInfoType, structVals);
|
|
|
|
typeInfoNameBuilder.str("");
|
|
typeInfoNameBuilder << baseStr << i;
|
|
typeInfoName = typeInfoNameBuilder.str();
|
|
|
|
// Note: Does not seem to work without allocation
|
|
nextGlobal =
|
|
new llvm::GlobalVariable(module,
|
|
ourTypeInfoType,
|
|
true,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nextStruct,
|
|
typeInfoName);
|
|
|
|
ourTypeInfoNames.push_back(typeInfoName);
|
|
ourTypeInfoNamesIndex[i] = typeInfoName;
|
|
}
|
|
|
|
ArgNames argNames;
|
|
ArgTypes argTypes;
|
|
llvm::Function* funct = NULL;
|
|
|
|
// print32Int
|
|
|
|
const llvm::Type* retType = builder.getVoidTy();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt32Ty());
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"print32Int",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// print64Int
|
|
|
|
retType = builder.getVoidTy();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt64Ty());
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"print64Int",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// printStr
|
|
|
|
retType = builder.getVoidTy();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"printStr",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// throwCppException
|
|
|
|
retType = builder.getVoidTy();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt32Ty());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"throwCppException",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// deleteOurException
|
|
|
|
retType = builder.getVoidTy();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"deleteOurException",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// createOurException
|
|
|
|
retType = builder.getInt8Ty()->getPointerTo();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt32Ty());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"createOurException",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// _Unwind_RaiseException
|
|
|
|
retType = builder.getInt32Ty();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
funct = createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"_Unwind_RaiseException",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
funct->addFnAttr(llvm::Attribute::NoReturn);
|
|
|
|
// _Unwind_Resume
|
|
|
|
retType = builder.getInt32Ty();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
funct = createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"_Unwind_Resume",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
funct->addFnAttr(llvm::Attribute::NoReturn);
|
|
|
|
// ourPersonality
|
|
|
|
retType = builder.getInt32Ty();
|
|
|
|
argTypes.clear();
|
|
argTypes.push_back(builder.getInt32Ty());
|
|
argTypes.push_back(builder.getInt32Ty());
|
|
argTypes.push_back(builder.getInt64Ty());
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
argTypes.push_back(builder.getInt8Ty()->getPointerTo());
|
|
|
|
argNames.clear();
|
|
|
|
createFunction(module,
|
|
retType,
|
|
argTypes,
|
|
argNames,
|
|
"ourPersonality",
|
|
llvm::Function::ExternalLinkage,
|
|
true,
|
|
false);
|
|
|
|
// llvm.eh.selector intrinsic
|
|
|
|
getDeclaration(&module, llvm::Intrinsic::eh_selector);
|
|
|
|
// llvm.eh.exception intrinsic
|
|
|
|
getDeclaration(&module, llvm::Intrinsic::eh_exception);
|
|
|
|
// llvm.eh.typeid.for intrinsic
|
|
|
|
getDeclaration(&module, llvm::Intrinsic::eh_typeid_for);
|
|
}
|
|
|
|
|
|
//===---------------------------------------------------------------------===//
|
|
// Main test driver code.
|
|
//===---------------------------------------------------------------------===//
|
|
|
|
/// Demo main routine which takes the type info types to throw. A test will
|
|
/// be run for each given type info type. While type info types with the value
|
|
/// of -1 will trigger a foreign C++ exception to be thrown; type info types
|
|
/// <= 6 and >= 1 will be caught by test functions; and type info types > 6
|
|
/// will result in exceptions which pass through to the test harness. All other
|
|
/// type info types are not supported and could cause a crash.
|
|
int main(int argc, char* argv[]) {
|
|
if (argc == 1) {
|
|
fprintf(stderr,
|
|
"\nUsage: ExceptionDemo <exception type to throw> "
|
|
"[<type 2>...<type n>].\n"
|
|
" Each type must have the value of 1 - 6 for "
|
|
"generated exceptions to be caught;\n"
|
|
" the value -1 for foreign C++ exceptions to be "
|
|
"generated and thrown;\n"
|
|
" or the values > 6 for exceptions to be ignored.\n"
|
|
"\nTry: ExceptionDemo 2 3 7 -1\n"
|
|
" for a full test.\n\n");
|
|
return(0);
|
|
}
|
|
|
|
// If not set, exception handling will not be turned on
|
|
llvm::JITExceptionHandling = true;
|
|
|
|
llvm::InitializeNativeTarget();
|
|
llvm::LLVMContext& context = llvm::getGlobalContext();
|
|
llvm::IRBuilder<> theBuilder(context);
|
|
|
|
// Make the module, which holds all the code.
|
|
llvm::Module* module = new llvm::Module("my cool jit", context);
|
|
|
|
// Build engine with JIT
|
|
llvm::EngineBuilder factory(module);
|
|
factory.setEngineKind(llvm::EngineKind::JIT);
|
|
factory.setAllocateGVsWithCode(false);
|
|
llvm::ExecutionEngine* executionEngine = factory.create();
|
|
|
|
{
|
|
llvm::FunctionPassManager fpm(module);
|
|
|
|
// Set up the optimizer pipeline.
|
|
// Start with registering info about how the
|
|
// target lays out data structures.
|
|
fpm.add(new llvm::TargetData(*executionEngine->getTargetData()));
|
|
|
|
// Optimizations turned on
|
|
#ifdef ADD_OPT_PASSES
|
|
|
|
// Promote allocas to registers.
|
|
fpm.add(llvm::createPromoteMemoryToRegisterPass());
|
|
|
|
// Do simple "peephole" optimizations and bit-twiddling optzns.
|
|
fpm.add(llvm::createInstructionCombiningPass());
|
|
|
|
// Reassociate expressions.
|
|
fpm.add(llvm::createReassociatePass());
|
|
|
|
// Eliminate Common SubExpressions.
|
|
fpm.add(llvm::createGVNPass());
|
|
|
|
// Simplify the control flow graph (deleting unreachable
|
|
// blocks, etc).
|
|
fpm.add(llvm::createCFGSimplificationPass());
|
|
#endif // ADD_OPT_PASSES
|
|
|
|
fpm.doInitialization();
|
|
|
|
// Generate test code using function throwCppException(...) as
|
|
// the function which throws foreign exceptions.
|
|
llvm::Function* toRun =
|
|
createUnwindExceptionTest(*module,
|
|
theBuilder,
|
|
fpm,
|
|
"throwCppException");
|
|
|
|
fprintf(stderr, "\nBegin module dump:\n\n");
|
|
|
|
module->dump();
|
|
|
|
fprintf(stderr, "\nEnd module dump:\n");
|
|
|
|
fprintf(stderr, "\n\nBegin Test:\n");
|
|
|
|
for (int i = 1; i < argc; ++i) {
|
|
// Run test for each argument whose value is the exception
|
|
// type to throw.
|
|
runExceptionThrow(executionEngine,
|
|
toRun,
|
|
(unsigned) strtoul(argv[i], NULL, 10));
|
|
}
|
|
|
|
fprintf(stderr, "\nEnd Test:\n\n");
|
|
}
|
|
|
|
delete executionEngine;
|
|
|
|
return 0;
|
|
}
|
|
|