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Initial checking of C++ exception handling library

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8146 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-25 22:35:36 +00:00
parent bfa964699f
commit 5337521c2b
7 changed files with 685 additions and 0 deletions
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223
runtime/GCCLibraries/crtend/C++-Exception.cpp Normal file
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//===- c++-exception.cpp - Exception handling support for C++ exceptions --===//
//
// This file defines the methods used to implement C++ exception handling in
// terms of the invoke and %llvm.unwind intrinsic. These primitives implement
// an exception handling ABI similar (but simpler and more efficient than) the
// Itanium C++ ABI exception handling standard.
//
//===----------------------------------------------------------------------===//
#include "c++-exception.h"
#include <cstdlib>
#include <cassert>
//===----------------------------------------------------------------------===//
// Generic exception support
//
// Thread local state for exception handling.
// FIXME: This should really be made thread-local!
//
static llvm_exception *CaughtExceptionStack = 0;
// UncaughtExceptionStack - The stack of exceptions currently being thrown.
static llvm_exception *UncaughtExceptionStack = 0;
// __llvm_eh_has_uncaught_exception - This is used to implement
// std::uncaught_exception.
//
bool __llvm_eh_has_uncaught_exception(void) {
return UncaughtExceptionStack != 0;
}
// __llvm_eh_current_uncaught_exception - This function checks to see if the
// current uncaught exception is of the specified language type. If so, it
// returns a pointer to the exception area data.
//
void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType == HandlerType)
return UncaughtExceptionStack+1;
return 0;
}
/*===----------------------------------------------------------------------===**
* C++ Specific exception handling support...
*/
// __llvm_cxxeh_allocate_exception - This function allocates space for the
// specified number of bytes, plus a C++ exception object header.
//
void *__llvm_cxxeh_allocate_exception(unsigned NumBytes) {
// FIXME: This should eventually have back-up buffers for out-of-memory
// situations.
//
llvm_cxx_exception *E =
(llvm_cxx_exception *)malloc(NumBytes+sizeof(llvm_cxx_exception));
E->BaseException.ExceptionType = 0; // intialize to invalid
return E+1; // return the pointer after the header
}
// __llvm_cxxeh_free_exception - Low-level function to free an exception. This
// is called directly from generated C++ code if evaluating the exception value
// into the exception location throws. Otherwise it is called from the C++
// exception object destructor.
//
void __llvm_cxxeh_free_exception(void *ObjectPtr) {
llvm_cxx_exception *E = (llvm_cxx_exception *)ObjectPtr - 1;
free(E);
}
// cxx_destructor - This function is called through the generic
// exception->ExceptionDestructor function pointer to destroy a caught
// exception.
//
static void cxx_destructor(llvm_exception *LE) {
void *ObjectPtr = LE+1;
llvm_cxx_exception *E = (llvm_cxx_exception *)ObjectPtr - 1;
// The exception is no longer caught.
assert(CaughtExceptionStack == LE &&
"Destroying an exception which is not the current caught exception?");
CaughtExceptionStack = LE->Next;
struct ExceptionFreer {
void *Ptr;
ExceptionFreer(void *P) : Ptr(P) {}
~ExceptionFreer() {
// Free the memory for the exception, when the function is left, even if
// the exception object dtor throws its own exception!
__llvm_cxxeh_free_exception(Ptr);
}
} EF(E+1);
// Run the exception object dtor if it exists. */
if (E->ExceptionObjectDestructor)
E->ExceptionObjectDestructor(E);
}
// __llvm_cxxeh_throw - Given a pointer to memory which has an exception object
// evaluated into it, this sets up all of the fields of the exception allowing
// it to be thrown. After calling this, the code should call %llvm.unwind
//
void __llvm_cxxeh_throw(void *ObjectPtr, const std::type_info *TypeInfoPtr,
void (*DtorPtr)(void*)) {
llvm_cxx_exception *E = (llvm_cxx_exception *)ObjectPtr - 1;
E->BaseException.ExceptionDestructor = cxx_destructor;
E->BaseException.ExceptionType = CXXException;
E->BaseException.Next = UncaughtExceptionStack;
UncaughtExceptionStack = &E->BaseException;
E->BaseException.HandlerCount = 0;
E->TypeInfo = TypeInfoPtr;
E->ExceptionObjectDestructor = DtorPtr;
E->UnexpectedHandler = 0; /* FIXME */
E->TerminateHandler = 0; /* FIXME */
}
// __llvm_cxxeh_current_uncaught_exception_isa - This function checks to see if
// the current uncaught exception is a C++ exception, and if it is of the
// specified type id. If so, it returns a pointer to the object adjusted as
// appropriate, otherwise it returns null.
//
void *__llvm_cxxeh_current_uncaught_exception_isa(
const std::type_info *CatchType) {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType != CXXException)
return 0; /* If it's not a c++ exception, it doesn't match! */
// If it is a C++ exception, use the type info object stored in the exception
// to see if TypeID matches and, if so, to adjust the exception object
// pointer.
//
llvm_cxx_exception *E = (llvm_cxx_exception*)UncaughtExceptionStack;
// ThrownPtr is a pointer to the object being thrown...
void *ThrownPtr = E+1;
const std::type_info *ThrownType = E->TypeInfo;
// FIXME: this code exists in the GCC exception handling library: I haven't
// thought about this yet, so it should be verified at some point!
#if 1
// Pointer types need to adjust the actual pointer, not
// the pointer to pointer that is the exception object.
// This also has the effect of passing pointer types
// "by value" through the __cxa_begin_catch return value.
if (ThrownType->__is_pointer_p())
ThrownPtr = *(void **)ThrownPtr;
#endif
if (CatchType->__do_catch(ThrownType, &ThrownPtr, 1))
return ThrownPtr;
return 0;
}
/* __llvm_cxxeh_begin_catch - This function is called by "exception handlers",
* which transition an exception from being uncaught to being caught. It
* returns a pointer to the exception object portion of the exception. This
* function must work with foreign exceptions.
*/
void *__llvm_cxxeh_begin_catch(void) {
llvm_exception *E = UncaughtExceptionStack;
assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
/* The exception is now no longer uncaught... */
UncaughtExceptionStack = E->Next;
/* The exception is now caught... */
E->Next = CaughtExceptionStack;
CaughtExceptionStack = E->Next;
/* Increment the handler count for this exception. */
E->HandlerCount++;
/* Return a pointer to the exception object */
return E+1;
}
/* __llvm_cxxeh_end_catch - This function decrements the HandlerCount of the
* top-level caught exception, destroying it if this is the last handler for the
* exception.
*/
void __llvm_cxxeh_end_catch(void) {
llvm_exception *E = CaughtExceptionStack;
assert(E && "There are no caught exceptions!");
/* If this is the last handler using the exception, destroy it now! */
if (--E->HandlerCount == 0) {
CaughtExceptionStack = E->Next; /* Unlink from the stack */
E->ExceptionDestructor(E); /* Release memory for the exception */
}
}
/* __llvm_cxxeh_rethrow - This function turns the top-level caught exception
* into an uncaught exception, in preparation for an llvm.unwind, which should
* follow immediately after the call to this function. This function must be
* prepared to deal with foreign exceptions.
*/
void __llvm_cxxeh_rethrow(void) {
llvm_exception *E = CaughtExceptionStack;
if (E == 0) {
/* 15.1.8 - If there are no uncaught exceptions being thrown, 'throw;'
* should call terminate.
*/
/* FIXME */assert(0 && "FIXME: this should call E->Terminate!");
}
/* Otherwise we have an exception to rethrow. Move it back to the uncaught
* stack.
*/
CaughtExceptionStack = E->Next;
E->Next = UncaughtExceptionStack;
UncaughtExceptionStack = E;
/* Decrement the number of handlers which are using the exception. */
--E->HandlerCount;
/* Return to the caller, which should perform the unwind now. */
}

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runtime/GCCLibraries/crtend/C++-Exception.h Normal file
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//===- c++-exception.h - C++ Specific exception Handling --------*- C++ -*-===//
//
// This file defines the data structures and API used by the C++ exception
// handling runtime library.
//
//===----------------------------------------------------------------------===//
#ifndef CXX_EXCEPTION_H
#define CXX_EXCEPTION_H
#include "exception.h"
#include <typeinfo>
typedef struct llvm_cxx_exception {
/* TypeInfo - A pointer to the C++ std::type_info object for this exception
* class. This is required because the class may not be polymorphic.
*/
const std::type_info *TypeInfo;
/* ExceptionObjectDestructor - A pointer to the function which destroys the
* object represented by this exception. This is required because the class
* may not be polymorphic. This may be null if there is no cleanup required.
*/
void (*ExceptionObjectDestructor)(void *);
/* UnexpectedHandler - This contains a pointer to the "unexpected" handler
* which may be registered by the user program with set_unexpected. Calls to
* unexpected which are a result of an exception throw are supposed to use the
* value of the handler at the time of the throw, not the currently set value.
*/
void *UnexpectedHandler;
/* TerminateHandler - This contains a pointer to the "terminate" handler which
* may be registered by the user program with set_terminate. Calls to
* unexpected which are a result of an exception throw are supposed to use the
* value of the handler at the time of the throw, not the currently set value.
*/
void *TerminateHandler;
/* BaseException - The language independent portion of the exception state.
* This is at the end of the record so that we can add additional members to
* this structure without breaking binary compatibility.
*/
llvm_exception BaseException;
} llvm_cxx_exception;
extern "C" {
void *__llvm_cxxeh_allocate_exception(unsigned NumBytes);
void __llvm_cxxeh_free_exception(void *ObjectPtr);
void __llvm_cxxeh_throw(void *ObjectPtr, const std::type_info *TypeInfoPtr,
void (*DtorPtr)(void*));
void * __llvm_cxxeh_current_uncaught_exception_isa(const std::type_info *Ty);
void *__llvm_cxxeh_begin_catch(void);
void __llvm_cxxeh_end_catch(void);
void __llvm_cxxeh_rethrow(void);
}
#endif

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runtime/GCCLibraries/crtend/Exception.h Normal file
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//===- exception.h - Generic language-independent exceptions ----*- C++ -*-===//
//
// This file defines the the shared data structures used by all language
// specific exception handling runtime libraries.
//
//===----------------------------------------------------------------------===//
#ifndef EXCEPTION_H
#define EXCEPTION_H
typedef struct llvm_exception {
// ExceptionDestructor - This call-back function is used to destroy the
// current exception, without requiring the caller to know what the concrete
// exception type is.
//
void (*ExceptionDestructor)(struct llvm_exception *);
// ExceptionType - This field identifies what runtime library this exception
// came from. Currently defined values are:
// 0 - Error
// 1 - longjmp exception (see longjmp-exception.c)
// 2 - C++ exception (see c++-exception.c)
//
unsigned ExceptionType;
// Next - This points to the next exception in the current stack.
struct llvm_exception *Next;
// HandlerCount - This is a count of the number of handlers which have
// currently caught this exception. If the handler is caught and this number
// falls to zero, the exception is destroyed.
//
unsigned HandlerCount;
} llvm_exception;
enum {
ErrorException = 0,
LongjmpException = 1,
CXXException = 2,
};
// Language independent exception handling API...
//
extern "C" {
bool __llvm_eh_has_uncaught_exception(void);
void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType);
}
#endif

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runtime/GCCLibraries/libexception/C++-Exception.cpp Normal file
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//===- c++-exception.cpp - Exception handling support for C++ exceptions --===//
//
// This file defines the methods used to implement C++ exception handling in
// terms of the invoke and %llvm.unwind intrinsic. These primitives implement
// an exception handling ABI similar (but simpler and more efficient than) the
// Itanium C++ ABI exception handling standard.
//
//===----------------------------------------------------------------------===//
#include "c++-exception.h"
#include <cstdlib>
#include <cassert>
//===----------------------------------------------------------------------===//
// Generic exception support
//
// Thread local state for exception handling.
// FIXME: This should really be made thread-local!
//
static llvm_exception *CaughtExceptionStack = 0;
// UncaughtExceptionStack - The stack of exceptions currently being thrown.
static llvm_exception *UncaughtExceptionStack = 0;
// __llvm_eh_has_uncaught_exception - This is used to implement
// std::uncaught_exception.
//
bool __llvm_eh_has_uncaught_exception(void) {
return UncaughtExceptionStack != 0;
}
// __llvm_eh_current_uncaught_exception - This function checks to see if the
// current uncaught exception is of the specified language type. If so, it
// returns a pointer to the exception area data.
//
void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType == HandlerType)
return UncaughtExceptionStack+1;
return 0;
}
/*===----------------------------------------------------------------------===**
* C++ Specific exception handling support...
*/
// __llvm_cxxeh_allocate_exception - This function allocates space for the
// specified number of bytes, plus a C++ exception object header.
//
void *__llvm_cxxeh_allocate_exception(unsigned NumBytes) {
// FIXME: This should eventually have back-up buffers for out-of-memory
// situations.
//
llvm_cxx_exception *E =
(llvm_cxx_exception *)malloc(NumBytes+sizeof(llvm_cxx_exception));
E->BaseException.ExceptionType = 0; // intialize to invalid
return E+1; // return the pointer after the header
}
// __llvm_cxxeh_free_exception - Low-level function to free an exception. This
// is called directly from generated C++ code if evaluating the exception value
// into the exception location throws. Otherwise it is called from the C++
// exception object destructor.
//
void __llvm_cxxeh_free_exception(void *ObjectPtr) {
llvm_cxx_exception *E = (llvm_cxx_exception *)ObjectPtr - 1;
free(E);
}
// cxx_destructor - This function is called through the generic
// exception->ExceptionDestructor function pointer to destroy a caught
// exception.
//
static void cxx_destructor(llvm_exception *LE) {
void *ObjectPtr = LE+1;
llvm_cxx_exception *E = (llvm_cxx_exception *)ObjectPtr - 1;
// The exception is no longer caught.
assert(CaughtExceptionStack == LE &&
"Destroying an exception which is not the current caught exception?");
CaughtExceptionStack = LE->Next;
struct ExceptionFreer {
void *Ptr;
ExceptionFreer(void *P) : Ptr(P) {}
~ExceptionFreer() {
// Free the memory for the exception, when the function is left, even if
// the exception object dtor throws its own exception!
__llvm_cxxeh_free_exception(Ptr);
}
} EF(E+1);
// Run the exception object dtor if it exists. */
if (E->ExceptionObjectDestructor)
E->ExceptionObjectDestructor(E);
}
// __llvm_cxxeh_throw - Given a pointer to memory which has an exception object
// evaluated into it, this sets up all of the fields of the exception allowing
// it to be thrown. After calling this, the code should call %llvm.unwind
//
void __llvm_cxxeh_throw(void *ObjectPtr, const std::type_info *TypeInfoPtr,
void (*DtorPtr)(void*)) {
llvm_cxx_exception *E = (llvm_cxx_exception *)ObjectPtr - 1;
E->BaseException.ExceptionDestructor = cxx_destructor;
E->BaseException.ExceptionType = CXXException;
E->BaseException.Next = UncaughtExceptionStack;
UncaughtExceptionStack = &E->BaseException;
E->BaseException.HandlerCount = 0;
E->TypeInfo = TypeInfoPtr;
E->ExceptionObjectDestructor = DtorPtr;
E->UnexpectedHandler = 0; /* FIXME */
E->TerminateHandler = 0; /* FIXME */
}
// __llvm_cxxeh_current_uncaught_exception_isa - This function checks to see if
// the current uncaught exception is a C++ exception, and if it is of the
// specified type id. If so, it returns a pointer to the object adjusted as
// appropriate, otherwise it returns null.
//
void *__llvm_cxxeh_current_uncaught_exception_isa(
const std::type_info *CatchType) {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType != CXXException)
return 0; /* If it's not a c++ exception, it doesn't match! */
// If it is a C++ exception, use the type info object stored in the exception
// to see if TypeID matches and, if so, to adjust the exception object
// pointer.
//
llvm_cxx_exception *E = (llvm_cxx_exception*)UncaughtExceptionStack;
// ThrownPtr is a pointer to the object being thrown...
void *ThrownPtr = E+1;
const std::type_info *ThrownType = E->TypeInfo;
// FIXME: this code exists in the GCC exception handling library: I haven't
// thought about this yet, so it should be verified at some point!
#if 1
// Pointer types need to adjust the actual pointer, not
// the pointer to pointer that is the exception object.
// This also has the effect of passing pointer types
// "by value" through the __cxa_begin_catch return value.
if (ThrownType->__is_pointer_p())
ThrownPtr = *(void **)ThrownPtr;
#endif
if (CatchType->__do_catch(ThrownType, &ThrownPtr, 1))
return ThrownPtr;
return 0;
}
/* __llvm_cxxeh_begin_catch - This function is called by "exception handlers",
* which transition an exception from being uncaught to being caught. It
* returns a pointer to the exception object portion of the exception. This
* function must work with foreign exceptions.
*/
void *__llvm_cxxeh_begin_catch(void) {
llvm_exception *E = UncaughtExceptionStack;
assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
/* The exception is now no longer uncaught... */
UncaughtExceptionStack = E->Next;
/* The exception is now caught... */
E->Next = CaughtExceptionStack;
CaughtExceptionStack = E->Next;
/* Increment the handler count for this exception. */
E->HandlerCount++;
/* Return a pointer to the exception object */
return E+1;
}
/* __llvm_cxxeh_end_catch - This function decrements the HandlerCount of the
* top-level caught exception, destroying it if this is the last handler for the
* exception.
*/
void __llvm_cxxeh_end_catch(void) {
llvm_exception *E = CaughtExceptionStack;
assert(E && "There are no caught exceptions!");
/* If this is the last handler using the exception, destroy it now! */
if (--E->HandlerCount == 0) {
CaughtExceptionStack = E->Next; /* Unlink from the stack */
E->ExceptionDestructor(E); /* Release memory for the exception */
}
}
/* __llvm_cxxeh_rethrow - This function turns the top-level caught exception
* into an uncaught exception, in preparation for an llvm.unwind, which should
* follow immediately after the call to this function. This function must be
* prepared to deal with foreign exceptions.
*/
void __llvm_cxxeh_rethrow(void) {
llvm_exception *E = CaughtExceptionStack;
if (E == 0) {
/* 15.1.8 - If there are no uncaught exceptions being thrown, 'throw;'
* should call terminate.
*/
/* FIXME */assert(0 && "FIXME: this should call E->Terminate!");
}
/* Otherwise we have an exception to rethrow. Move it back to the uncaught
* stack.
*/
CaughtExceptionStack = E->Next;
E->Next = UncaughtExceptionStack;
UncaughtExceptionStack = E;
/* Decrement the number of handlers which are using the exception. */
--E->HandlerCount;
/* Return to the caller, which should perform the unwind now. */
}

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runtime/GCCLibraries/libexception/C++-Exception.h Normal file
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//===- c++-exception.h - C++ Specific exception Handling --------*- C++ -*-===//
//
// This file defines the data structures and API used by the C++ exception
// handling runtime library.
//
//===----------------------------------------------------------------------===//
#ifndef CXX_EXCEPTION_H
#define CXX_EXCEPTION_H
#include "exception.h"
#include <typeinfo>
typedef struct llvm_cxx_exception {
/* TypeInfo - A pointer to the C++ std::type_info object for this exception
* class. This is required because the class may not be polymorphic.
*/
const std::type_info *TypeInfo;
/* ExceptionObjectDestructor - A pointer to the function which destroys the
* object represented by this exception. This is required because the class
* may not be polymorphic. This may be null if there is no cleanup required.
*/
void (*ExceptionObjectDestructor)(void *);
/* UnexpectedHandler - This contains a pointer to the "unexpected" handler
* which may be registered by the user program with set_unexpected. Calls to
* unexpected which are a result of an exception throw are supposed to use the
* value of the handler at the time of the throw, not the currently set value.
*/
void *UnexpectedHandler;
/* TerminateHandler - This contains a pointer to the "terminate" handler which
* may be registered by the user program with set_terminate. Calls to
* unexpected which are a result of an exception throw are supposed to use the
* value of the handler at the time of the throw, not the currently set value.
*/
void *TerminateHandler;
/* BaseException - The language independent portion of the exception state.
* This is at the end of the record so that we can add additional members to
* this structure without breaking binary compatibility.
*/
llvm_exception BaseException;
} llvm_cxx_exception;
extern "C" {
void *__llvm_cxxeh_allocate_exception(unsigned NumBytes);
void __llvm_cxxeh_free_exception(void *ObjectPtr);
void __llvm_cxxeh_throw(void *ObjectPtr, const std::type_info *TypeInfoPtr,
void (*DtorPtr)(void*));
void * __llvm_cxxeh_current_uncaught_exception_isa(const std::type_info *Ty);
void *__llvm_cxxeh_begin_catch(void);
void __llvm_cxxeh_end_catch(void);
void __llvm_cxxeh_rethrow(void);
}
#endif

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//===- exception.h - Generic language-independent exceptions ----*- C++ -*-===//
//
// This file defines the the shared data structures used by all language
// specific exception handling runtime libraries.
//
//===----------------------------------------------------------------------===//
#ifndef EXCEPTION_H
#define EXCEPTION_H
typedef struct llvm_exception {
// ExceptionDestructor - This call-back function is used to destroy the
// current exception, without requiring the caller to know what the concrete
// exception type is.
//
void (*ExceptionDestructor)(struct llvm_exception *);
// ExceptionType - This field identifies what runtime library this exception
// came from. Currently defined values are:
// 0 - Error
// 1 - longjmp exception (see longjmp-exception.c)
// 2 - C++ exception (see c++-exception.c)
//
unsigned ExceptionType;
// Next - This points to the next exception in the current stack.
struct llvm_exception *Next;
// HandlerCount - This is a count of the number of handlers which have
// currently caught this exception. If the handler is caught and this number
// falls to zero, the exception is destroyed.
//
unsigned HandlerCount;
} llvm_exception;
enum {
ErrorException = 0,
LongjmpException = 1,
CXXException = 2,
};
// Language independent exception handling API...
//
extern "C" {
bool __llvm_eh_has_uncaught_exception(void);
void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType);
}
#endif

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runtime/GCCLibraries/libexception/Makefile Normal file
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LEVEL = ../../..
BYTECODE_LIBRARY=1
DONT_BUILD_RELINKED=1
LIBRARYNAME=exception
#Source = crtend.c listend.ll
###EXPORTED_SYMBOL_LIST = __main,llvm.global_ctors,llvm.global_dtors
include $(LEVEL)/Makefile.common
$(LLVMGCCDIR)/bytecode-libs/crtend.o: $(LIBNAME_BC)
@cp $< $@
install:: $(LLVMGCCDIR)/bytecode-libs/crtend.o
@rm $(LLVMGCCDIR)/bytecode-libs/libcrtend.bc