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Move language independent exception handling routines OUT of C++Exception.cpp

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-30 23:17:51 +00:00
parent e86159df9d
commit 7f45519784
6 changed files with 156 additions and 108 deletions
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71
runtime/GCCLibraries/crtend/C++-Exception.cpp
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@ -17,44 +17,14 @@
#include <stdio.h>
#endif
//===----------------------------------------------------------------------===//
// Generic exception support
//
// Thread local state for exception handling.
// FIXME: This should really be made thread-local!
//
// LastCaughtException - The last exception caught by this handler. This is for
// implementation of _rethrow and _get_last_caught.
//
// FIXME: This should be thread-local!
//
static llvm_exception *LastCaughtException = 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() throw() {
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) throw() {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType == HandlerType)
return UncaughtExceptionStack+1;
return 0;
}
//===----------------------------------------------------------------------===//
// C++ Specific exception handling support...
//
using namespace __cxxabiv1;
// __llvm_cxxeh_allocate_exception - This function allocates space for the
@ -113,8 +83,6 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
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->BaseException.isRethrown = 0;
@ -122,6 +90,8 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
E->ExceptionObjectDestructor = DtorPtr;
E->UnexpectedHandler = __unexpected_handler;
E->TerminateHandler = __terminate_handler;
__llvm_eh_add_uncaught_exception(&E->BaseException);
}
@ -163,16 +133,15 @@ static void *CXXExceptionISA(llvm_cxx_exception *E,
// appropriate, otherwise it returns null.
//
void *__llvm_cxxeh_current_uncaught_exception_isa(void *CatchType) throw() {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType != CXXException)
return 0; // If it's not a c++ exception, it doesn't match!
void *EPtr = __llvm_eh_current_uncaught_exception_type(CXXException);
if (EPtr == 0) 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.
//
const std::type_info *Info = (const std::type_info *)CatchType;
return CXXExceptionISA(get_cxx_exception(UncaughtExceptionStack), Info);
return CXXExceptionISA((llvm_cxx_exception*)EPtr - 1, Info);
}
@ -182,11 +151,7 @@ void *__llvm_cxxeh_current_uncaught_exception_isa(void *CatchType) throw() {
// function must work with foreign exceptions.
//
void *__llvm_cxxeh_begin_catch() throw() {
llvm_exception *E = UncaughtExceptionStack;
assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
// The exception is now no longer uncaught.
UncaughtExceptionStack = E->Next;
llvm_exception *E = __llvm_eh_pop_from_uncaught_stack();
// The exception is now caught.
LastCaughtException = E;
@ -254,9 +219,9 @@ void __llvm_cxxeh_end_catch(void *Ex) /* might throw */ {
// time.
void __llvm_cxxeh_call_terminate() throw() {
void (*Handler)(void) = __terminate_handler;
if (UncaughtExceptionStack)
if (UncaughtExceptionStack->ExceptionType == CXXException)
Handler = get_cxx_exception(UncaughtExceptionStack)->TerminateHandler;
if (__llvm_eh_has_uncaught_exception())
if (void *EPtr = __llvm_eh_current_uncaught_exception_type(CXXException))
Handler = ((llvm_cxx_exception*)EPtr - 1)->TerminateHandler;
__terminate(Handler);
}
@ -279,8 +244,7 @@ void __llvm_cxxeh_rethrow() throw() {
// Add the exception to the top of the uncaught stack, to preserve the
// invariant that the top of the uncaught stack is the current exception.
E->Next = UncaughtExceptionStack;
UncaughtExceptionStack = E;
__llvm_eh_add_uncaught_exception(E);
// Return to the caller, which should perform the unwind now.
}
@ -320,8 +284,6 @@ static bool ExceptionSpecificationPermitsException(llvm_exception *E,
//
void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
const std::type_info *TypeInfo = (const std::type_info *)Info;
llvm_exception *E = UncaughtExceptionStack;
assert(E && "No uncaught exceptions!");
if (TypeInfo == 0) { // Empty exception specification
// Whatever exception this is, it is not allowed by the (empty) spec, call
@ -337,6 +299,9 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
}
}
llvm_exception *E = __llvm_eh_get_uncaught_exception();
assert(E && "No uncaught exceptions!");
// Check to see if the exception matches one of the types allowed by the
// exception specification. If so, return to the caller to have the
// exception rethrown.
@ -369,8 +334,7 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
// Grab the newly caught exception. If this exception is permitted by the
// specification, allow it to be thrown.
E = UncaughtExceptionStack;
assert(E && "No uncaught exceptions!");
E = __llvm_eh_get_uncaught_exception();
va_start(Args, Info);
Ok = ExceptionSpecificationPermitsException(E, TypeInfo, Args);
@ -385,8 +349,7 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
}
// Grab the new bad_exception...
E = UncaughtExceptionStack;
assert(E && "No uncaught exceptions!");
E = __llvm_eh_get_uncaught_exception();
// If it's permitted, allow it to be thrown instead.
va_start(Args, Info);

57
runtime/GCCLibraries/crtend/Exception.cpp Normal file
View File

@ -0,0 +1,57 @@
//===- Exception.cpp - Generic language-independent exceptions ------------===//
//
// This file defines the the shared data structures used by all language
// specific exception handling runtime libraries.
//
//===----------------------------------------------------------------------===//
#include "Exception.h"
#include <cassert>
// Thread local state for exception handling. FIXME: This should really be made
// thread-local!
// 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() throw() {
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) throw() {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType == HandlerType)
return UncaughtExceptionStack+1;
return 0;
}
// __llvm_eh_add_uncaught_exception - This adds the specified exception to the
// top of the uncaught exception stack. The exception should not already be on
// the stack!
void __llvm_eh_add_uncaught_exception(llvm_exception *E) throw() {
E->Next = UncaughtExceptionStack;
UncaughtExceptionStack = E;
}
// __llvm_eh_get_uncaught_exception - Returns the current uncaught exception.
// There must be an uncaught exception for this to work!
llvm_exception *__llvm_eh_get_uncaught_exception() throw() {
assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
return UncaughtExceptionStack;
}
// __llvm_eh_pop_from_uncaught_stack - Remove the current uncaught exception
// from the top of the stack.
llvm_exception *__llvm_eh_pop_from_uncaught_stack() throw() {
llvm_exception *E = __llvm_eh_get_uncaught_exception();
UncaughtExceptionStack = E->Next;
return E;
}

4
runtime/GCCLibraries/crtend/Exception.h
View File

@ -52,6 +52,10 @@ enum {
extern "C" {
bool __llvm_eh_has_uncaught_exception() throw();
void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) throw();
void __llvm_eh_add_uncaught_exception(llvm_exception *E) throw();
llvm_exception *__llvm_eh_get_uncaught_exception() throw();
llvm_exception *__llvm_eh_pop_from_uncaught_stack() throw();
}
#endif

71
runtime/GCCLibraries/libexception/C++-Exception.cpp
View File

@ -17,44 +17,14 @@
#include <stdio.h>
#endif
//===----------------------------------------------------------------------===//
// Generic exception support
//
// Thread local state for exception handling.
// FIXME: This should really be made thread-local!
//
// LastCaughtException - The last exception caught by this handler. This is for
// implementation of _rethrow and _get_last_caught.
//
// FIXME: This should be thread-local!
//
static llvm_exception *LastCaughtException = 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() throw() {
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) throw() {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType == HandlerType)
return UncaughtExceptionStack+1;
return 0;
}
//===----------------------------------------------------------------------===//
// C++ Specific exception handling support...
//
using namespace __cxxabiv1;
// __llvm_cxxeh_allocate_exception - This function allocates space for the
@ -113,8 +83,6 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
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->BaseException.isRethrown = 0;
@ -122,6 +90,8 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
E->ExceptionObjectDestructor = DtorPtr;
E->UnexpectedHandler = __unexpected_handler;
E->TerminateHandler = __terminate_handler;
__llvm_eh_add_uncaught_exception(&E->BaseException);
}
@ -163,16 +133,15 @@ static void *CXXExceptionISA(llvm_cxx_exception *E,
// appropriate, otherwise it returns null.
//
void *__llvm_cxxeh_current_uncaught_exception_isa(void *CatchType) throw() {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType != CXXException)
return 0; // If it's not a c++ exception, it doesn't match!
void *EPtr = __llvm_eh_current_uncaught_exception_type(CXXException);
if (EPtr == 0) 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.
//
const std::type_info *Info = (const std::type_info *)CatchType;
return CXXExceptionISA(get_cxx_exception(UncaughtExceptionStack), Info);
return CXXExceptionISA((llvm_cxx_exception*)EPtr - 1, Info);
}
@ -182,11 +151,7 @@ void *__llvm_cxxeh_current_uncaught_exception_isa(void *CatchType) throw() {
// function must work with foreign exceptions.
//
void *__llvm_cxxeh_begin_catch() throw() {
llvm_exception *E = UncaughtExceptionStack;
assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
// The exception is now no longer uncaught.
UncaughtExceptionStack = E->Next;
llvm_exception *E = __llvm_eh_pop_from_uncaught_stack();
// The exception is now caught.
LastCaughtException = E;
@ -254,9 +219,9 @@ void __llvm_cxxeh_end_catch(void *Ex) /* might throw */ {
// time.
void __llvm_cxxeh_call_terminate() throw() {
void (*Handler)(void) = __terminate_handler;
if (UncaughtExceptionStack)
if (UncaughtExceptionStack->ExceptionType == CXXException)
Handler = get_cxx_exception(UncaughtExceptionStack)->TerminateHandler;
if (__llvm_eh_has_uncaught_exception())
if (void *EPtr = __llvm_eh_current_uncaught_exception_type(CXXException))
Handler = ((llvm_cxx_exception*)EPtr - 1)->TerminateHandler;
__terminate(Handler);
}
@ -279,8 +244,7 @@ void __llvm_cxxeh_rethrow() throw() {
// Add the exception to the top of the uncaught stack, to preserve the
// invariant that the top of the uncaught stack is the current exception.
E->Next = UncaughtExceptionStack;
UncaughtExceptionStack = E;
__llvm_eh_add_uncaught_exception(E);
// Return to the caller, which should perform the unwind now.
}
@ -320,8 +284,6 @@ static bool ExceptionSpecificationPermitsException(llvm_exception *E,
//
void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
const std::type_info *TypeInfo = (const std::type_info *)Info;
llvm_exception *E = UncaughtExceptionStack;
assert(E && "No uncaught exceptions!");
if (TypeInfo == 0) { // Empty exception specification
// Whatever exception this is, it is not allowed by the (empty) spec, call
@ -337,6 +299,9 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
}
}
llvm_exception *E = __llvm_eh_get_uncaught_exception();
assert(E && "No uncaught exceptions!");
// Check to see if the exception matches one of the types allowed by the
// exception specification. If so, return to the caller to have the
// exception rethrown.
@ -369,8 +334,7 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
// Grab the newly caught exception. If this exception is permitted by the
// specification, allow it to be thrown.
E = UncaughtExceptionStack;
assert(E && "No uncaught exceptions!");
E = __llvm_eh_get_uncaught_exception();
va_start(Args, Info);
Ok = ExceptionSpecificationPermitsException(E, TypeInfo, Args);
@ -385,8 +349,7 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
}
// Grab the new bad_exception...
E = UncaughtExceptionStack;
assert(E && "No uncaught exceptions!");
E = __llvm_eh_get_uncaught_exception();
// If it's permitted, allow it to be thrown instead.
va_start(Args, Info);

57
runtime/GCCLibraries/libexception/Exception.cpp Normal file
View File

@ -0,0 +1,57 @@
//===- Exception.cpp - Generic language-independent exceptions ------------===//
//
// This file defines the the shared data structures used by all language
// specific exception handling runtime libraries.
//
//===----------------------------------------------------------------------===//
#include "Exception.h"
#include <cassert>
// Thread local state for exception handling. FIXME: This should really be made
// thread-local!
// 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() throw() {
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) throw() {
assert(UncaughtExceptionStack && "No uncaught exception!");
if (UncaughtExceptionStack->ExceptionType == HandlerType)
return UncaughtExceptionStack+1;
return 0;
}
// __llvm_eh_add_uncaught_exception - This adds the specified exception to the
// top of the uncaught exception stack. The exception should not already be on
// the stack!
void __llvm_eh_add_uncaught_exception(llvm_exception *E) throw() {
E->Next = UncaughtExceptionStack;
UncaughtExceptionStack = E;
}
// __llvm_eh_get_uncaught_exception - Returns the current uncaught exception.
// There must be an uncaught exception for this to work!
llvm_exception *__llvm_eh_get_uncaught_exception() throw() {
assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
return UncaughtExceptionStack;
}
// __llvm_eh_pop_from_uncaught_stack - Remove the current uncaught exception
// from the top of the stack.
llvm_exception *__llvm_eh_pop_from_uncaught_stack() throw() {
llvm_exception *E = __llvm_eh_get_uncaught_exception();
UncaughtExceptionStack = E->Next;
return E;
}

4
runtime/GCCLibraries/libexception/Exception.h
View File

@ -52,6 +52,10 @@ enum {
extern "C" {
bool __llvm_eh_has_uncaught_exception() throw();
void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) throw();
void __llvm_eh_add_uncaught_exception(llvm_exception *E) throw();
llvm_exception *__llvm_eh_get_uncaught_exception() throw();
llvm_exception *__llvm_eh_pop_from_uncaught_stack() throw();
}
#endif