--- /dev/null
+/* $Id: cpp.c,v 1.1 2003/04/30 22:07:30 gvg Exp $
+ *
+ * COPYRIGHT: See COPYING in the top level directory
+ * PROJECT: ReactOS C runtime
+ * FILE: cpp.c
+ * PURPOSE: C++ runtime
+ * PROGRAMMERS: Ge van Geldorp (ge@gse.nl)
+ * NOTES: Copied from Wine and slightly adapter for ReactOS
+ */
+
+#include <windows.h>
+#include <msvcrt/internal/tls.h>
+#include <msvcrt/stddef.h>
+
+#define CXX_FRAME_MAGIC 0x19930520
+#define CXX_EXCEPTION 0xe06d7363
+
+typedef void (*v_table_ptr)();
+
+typedef struct __type_info
+{
+ v_table_ptr *vtable;
+ void *data;
+ char name[1];
+} type_info;
+
+/* the exception frame used by CxxFrameHandler */
+typedef struct __cxx_exception_frame
+{
+ EXCEPTION_REGISTRATION frame; /* the standard exception frame */
+ int trylevel;
+ DWORD ebp;
+} cxx_exception_frame;
+
+/* info about a single catch {} block */
+typedef struct __catchblock_info
+{
+ UINT flags; /* flags (see below) */
+ type_info *type_info; /* C++ type caught by this block */
+ int offset; /* stack offset to copy exception object to */
+ void (*handler)(); /* catch block handler code */
+} catchblock_info;
+#define TYPE_FLAG_CONST 1
+#define TYPE_FLAG_VOLATILE 2
+#define TYPE_FLAG_REFERENCE 8
+
+/* info about a single try {} block */
+typedef struct __tryblock_info
+{
+ int start_level; /* start trylevel of that block */
+ int end_level; /* end trylevel of that block */
+ int catch_level; /* initial trylevel of the catch block */
+ int catchblock_count; /* count of catch blocks in array */
+ catchblock_info *catchblock; /* array of catch blocks */
+} tryblock_info;
+
+/* info about the unwind handler for a given trylevel */
+typedef struct __unwind_info
+{
+ int prev; /* prev trylevel unwind handler, to run after this one */
+ void (*handler)(); /* unwind handler */
+} unwind_info;
+
+/* descriptor of all try blocks of a given function */
+typedef struct __cxx_function_descr
+{
+ UINT magic; /* must be CXX_FRAME_MAGIC */
+ UINT unwind_count; /* number of unwind handlers */
+ unwind_info *unwind_table; /* array of unwind handlers */
+ UINT tryblock_count; /* number of try blocks */
+ tryblock_info *tryblock; /* array of try blocks */
+ UINT unknown[3];
+} cxx_function_descr;
+
+/* complete information about a C++ type */
+typedef struct __cxx_type_info
+{
+ UINT flags; /* flags (see CLASS_* flags below) */
+ type_info *type_info; /* C++ type info */
+ int this_offset; /* offset of base class this pointer from start of object */
+ int vbase_descr; /* offset of virtual base class descriptor */
+ int vbase_offset; /* offset of this pointer offset in virtual base class descriptor */
+ size_t size; /* object size */
+ void (*copy_ctor)(); /* copy constructor */
+} cxx_type_info;
+#define CLASS_IS_SIMPLE_TYPE 1
+#define CLASS_HAS_VIRTUAL_BASE_CLASS 4
+
+/* table of C++ types that apply for a given object */
+typedef struct __cxx_type_info_table
+{
+ UINT count; /* number of types */
+ cxx_type_info *info[1]; /* array of types */
+} cxx_type_info_table;
+
+typedef DWORD (*cxx_exc_custom_handler)( PEXCEPTION_RECORD, cxx_exception_frame*,
+ PCONTEXT, PEXCEPTION_REGISTRATION*,
+ cxx_function_descr*, int nested_trylevel,
+ PEXCEPTION_REGISTRATION nested_frame,
+ DWORD unknown3 );
+
+/* type information for an exception object */
+typedef struct __cxx_exception_type
+{
+ UINT flags; /* TYPE_FLAG flags */
+ void (*destructor)(); /* exception object destructor */
+ cxx_exc_custom_handler custom_handler; /* custom handler for this exception */
+ cxx_type_info_table *type_info_table; /* list of types for this exception object */
+} cxx_exception_type;
+
+/* ??1type_info@@UAE@XZ (MSVCRT.@) */
+void MSVCRT_type_info_dtor(type_info * _this)
+{
+ if (_this->data)
+ {
+ free(_this->data);
+ }
+}
+
+static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
+ PCONTEXT exc_context, PEXCEPTION_REGISTRATION* dispatch,
+ cxx_function_descr *descr, PEXCEPTION_REGISTRATION nested_frame,
+ int nested_trylevel, CONTEXT_X86 *context );
+
+/* call a function with a given ebp */
+inline static void *call_ebp_func( void *func, void *ebp )
+{
+ void *ret;
+ __asm__ __volatile__ ("pushl %%ebp; movl %2,%%ebp; call *%%eax; popl %%ebp" \
+ : "=a" (ret) : "0" (func), "g" (ebp) : "ecx", "edx", "memory" );
+ return ret;
+}
+
+/* call a copy constructor */
+inline static void call_copy_ctor( void *func, void *this, void *src, int has_vbase )
+{
+#if 0
+ TRACE( "calling copy ctor %p object %p src %p\n", func, this, src );
+#endif
+ if (has_vbase)
+ /* in that case copy ctor takes an extra bool indicating whether to copy the base class */
+ __asm__ __volatile__("pushl $1; pushl %2; call *%0"
+ : : "r" (func), "c" (this), "g" (src) : "eax", "edx", "memory" );
+ else
+ __asm__ __volatile__("pushl %2; call *%0"
+ : : "r" (func), "c" (this), "g" (src) : "eax", "edx", "memory" );
+}
+
+/* call the destructor of the exception object */
+inline static void call_dtor( void *func, void *object )
+{
+ __asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" );
+}
+
+
+static void dump_type( cxx_type_info *type )
+{
+#if 0
+ DPRINTF( "flags %x type %p", type->flags, type->type_info );
+ if (type->type_info) DPRINTF( " (%p %s)", type->type_info->data, type->type_info->name );
+ DPRINTF( " offset %d vbase %d,%d size %d copy ctor %p\n", type->this_offset,
+ type->vbase_descr, type->vbase_offset, type->size, type->copy_ctor );
+#endif
+}
+
+static void dump_exception_type( cxx_exception_type *type )
+{
+#if 0
+ int i;
+
+ DPRINTF( "exception type:\n" );
+ DPRINTF( "flags %x destr %p handler %p type info %p\n",
+ type->flags, type->destructor, type->custom_handler, type->type_info_table );
+ for (i = 0; i < type->type_info_table->count; i++)
+ {
+ DPRINTF( " %d: ", i );
+ dump_type( type->type_info_table->info[i] );
+ }
+#endif
+}
+
+static void dump_function_descr( cxx_function_descr *descr, cxx_exception_type *info )
+{
+#if 0
+ int i, j;
+
+ DPRINTF( "function descr:\n" );
+ DPRINTF( "magic %x\n", descr->magic );
+ DPRINTF( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count );
+ for (i = 0; i < descr->unwind_count; i++)
+ {
+ DPRINTF( " %d: prev %d func %p\n", i,
+ descr->unwind_table[i].prev, descr->unwind_table[i].handler );
+ }
+ DPRINTF( "try table: %p %d\n", descr->tryblock, descr->tryblock_count );
+ for (i = 0; i < descr->tryblock_count; i++)
+ {
+ DPRINTF( " %d: start %d end %d catchlevel %d catch %p %d\n", i,
+ descr->tryblock[i].start_level, descr->tryblock[i].end_level,
+ descr->tryblock[i].catch_level, descr->tryblock[i].catchblock,
+ descr->tryblock[i].catchblock_count );
+ for (j = 0; j < descr->tryblock[i].catchblock_count; j++)
+ {
+ catchblock_info *ptr = &descr->tryblock[i].catchblock[j];
+ DPRINTF( " %d: flags %x offset %d handler %p type %p",
+ j, ptr->flags, ptr->offset, ptr->handler, ptr->type_info );
+ if (ptr->type_info) DPRINTF( " (%p %s)", ptr->type_info->data, ptr->type_info->name );
+ DPRINTF( "\n" );
+ }
+ }
+#endif
+}
+
+/* compute the this pointer for a base class of a given type */
+static void *get_this_pointer( cxx_type_info *type, void *object )
+{
+ void *this_ptr;
+ int *offset_ptr;
+
+ if (!object) return NULL;
+ this_ptr = (char *)object + type->this_offset;
+ if (type->vbase_descr >= 0)
+ {
+ /* move this ptr to vbase descriptor */
+ this_ptr = (char *)this_ptr + type->vbase_descr;
+ /* and fetch additional offset from vbase descriptor */
+ offset_ptr = (int *)(*(char **)this_ptr + type->vbase_offset);
+ this_ptr = (char *)this_ptr + *offset_ptr;
+ }
+ return this_ptr;
+}
+
+/* check if the exception type is caught by a given catch block, and return the type that matched */
+static cxx_type_info *find_caught_type( cxx_exception_type *exc_type, catchblock_info *catchblock )
+{
+ UINT i;
+
+ for (i = 0; i < exc_type->type_info_table->count; i++)
+ {
+ cxx_type_info *type = exc_type->type_info_table->info[i];
+
+ if (!catchblock->type_info) return type; /* catch(...) matches any type */
+ if (catchblock->type_info != type->type_info)
+ {
+ if (strcmp( catchblock->type_info->name, type->type_info->name )) continue;
+ }
+ /* type is the same, now check the flags */
+ if ((exc_type->flags & TYPE_FLAG_CONST) &&
+ !(catchblock->flags & TYPE_FLAG_CONST)) continue;
+ if ((exc_type->flags & TYPE_FLAG_VOLATILE) &&
+ !(catchblock->flags & TYPE_FLAG_VOLATILE)) continue;
+ return type; /* it matched */
+ }
+ return NULL;
+}
+
+
+/* copy the exception object where the catch block wants it */
+static void copy_exception( void *object, cxx_exception_frame *frame,
+ catchblock_info *catchblock, cxx_type_info *type )
+{
+ void **dest_ptr;
+
+ if (!catchblock->type_info || !catchblock->type_info->name[0]) return;
+ if (!catchblock->offset) return;
+ dest_ptr = (void **)((char *)&frame->ebp + catchblock->offset);
+
+ if (catchblock->flags & TYPE_FLAG_REFERENCE)
+ {
+ *dest_ptr = get_this_pointer( type, object );
+ }
+ else if (type->flags & CLASS_IS_SIMPLE_TYPE)
+ {
+ memmove( dest_ptr, object, type->size );
+ /* if it is a pointer, adjust it */
+ if (type->size == sizeof(void *)) *dest_ptr = get_this_pointer( type, *dest_ptr );
+ }
+ else /* copy the object */
+ {
+ if (type->copy_ctor)
+ call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(type,object),
+ (type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) );
+ else
+ memmove( dest_ptr, get_this_pointer(type,object), type->size );
+ }
+}
+
+/* unwind the local function up to a given trylevel */
+static void cxx_local_unwind( cxx_exception_frame* frame, cxx_function_descr *descr, int last_level)
+{
+ void (*handler)();
+ int trylevel = frame->trylevel;
+
+ while (trylevel != last_level)
+ {
+ if (trylevel < 0 || trylevel >= descr->unwind_count)
+ {
+ OutputDebugString( "invalid trylevel\n" );
+ _exit(1);
+ }
+ handler = descr->unwind_table[trylevel].handler;
+ if (handler)
+ {
+#if 0
+ TRACE( "calling unwind handler %p trylevel %d last %d ebp %p\n",
+ handler, trylevel, last_level, &frame->ebp );
+#endif
+ call_ebp_func( handler, &frame->ebp );
+ }
+ trylevel = descr->unwind_table[trylevel].prev;
+ }
+ frame->trylevel = last_level;
+}
+
+/* exception frame for nested exceptions in catch block */
+struct catch_func_nested_frame
+{
+ EXCEPTION_REGISTRATION frame; /* standard exception frame */
+ EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */
+ cxx_exception_frame *cxx_frame; /* frame of parent exception */
+ cxx_function_descr *descr; /* descriptor of parent exception */
+ int trylevel; /* current try level */
+};
+
+/* handler for exceptions happening while calling a catch function */
+static EXCEPTION_DISPOSITION catch_function_nested_handler(PEXCEPTION_RECORD rec,
+ PEXCEPTION_REGISTRATION frame,
+ PCONTEXT context,
+ PVOID DispatcherContext)
+{
+ struct catch_func_nested_frame *nested_frame = (struct catch_func_nested_frame *)frame;
+
+ if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
+ {
+ GetThreadData()->exc_record = nested_frame->prev_rec;
+ return ExceptionContinueSearch;
+ }
+ else
+ {
+#if 0
+ TRACE( "got nested exception in catch function\n" );
+#endif
+ return cxx_frame_handler( rec, nested_frame->cxx_frame, context,
+ NULL, nested_frame->descr, &nested_frame->frame,
+ nested_frame->trylevel, context );
+ }
+}
+
+static inline PEXCEPTION_REGISTRATION __wine_push_frame( PEXCEPTION_REGISTRATION frame )
+{
+#if defined(__GNUC__) && defined(__i386__)
+ PEXCEPTION_REGISTRATION prev;
+ __asm__ __volatile__(".byte 0x64\n\tmovl (0),%0"
+ "\n\tmovl %0,(%1)"
+ "\n\t.byte 0x64\n\tmovl %1,(0)"
+ : "=&r" (prev) : "r" (frame) : "memory" );
+ return prev;
+#else
+ NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
+ frame->prev = (void *)teb->ExceptionList;
+ teb->ExceptionList = (void *)frame;
+ return frame->prev;
+#endif
+}
+
+static inline PEXCEPTION_REGISTRATION __wine_pop_frame( PEXCEPTION_REGISTRATION frame )
+{
+#if defined(__GNUC__) && defined(__i386__)
+ __asm__ __volatile__(".byte 0x64\n\tmovl %0,(0)"
+ : : "r" (frame->prev) : "memory" );
+ return frame->prev;
+
+#else
+ NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
+ teb->ExceptionList = (void *)frame->prev;
+ return frame->prev;
+#endif
+}
+
+/* find and call the appropriate catch block for an exception */
+/* returns the address to continue execution to after the catch block was called */
+inline static void *call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame,
+ cxx_function_descr *descr, int nested_trylevel,
+ cxx_exception_type *info )
+{
+ int i, j;
+ void *addr, *object = (void *)rec->ExceptionInformation[1];
+ struct catch_func_nested_frame nested_frame;
+ int trylevel = frame->trylevel;
+ PTHREADDATA thread_data = GetThreadData();
+
+ for (i = 0; i < descr->tryblock_count; i++)
+ {
+ tryblock_info *tryblock = &descr->tryblock[i];
+
+ if (trylevel < tryblock->start_level) continue;
+ if (trylevel > tryblock->end_level) continue;
+
+ /* got a try block */
+ for (j = 0; j < tryblock->catchblock_count; j++)
+ {
+ catchblock_info *catchblock = &tryblock->catchblock[j];
+ cxx_type_info *type = find_caught_type( info, catchblock );
+ if (!type) continue;
+
+#if 0
+ TRACE( "matched type %p in tryblock %d catchblock %d\n", type, i, j );
+#endif
+
+ /* copy the exception to its destination on the stack */
+ copy_exception( object, frame, catchblock, type );
+
+ /* unwind the stack */
+ RtlUnwind( &(frame->frame), 0, rec, 0 );
+ cxx_local_unwind( frame, descr, tryblock->start_level );
+ frame->trylevel = tryblock->end_level + 1;
+
+ /* call the catch block */
+#if 0
+ TRACE( "calling catch block %p for type %p addr %p ebp %p\n",
+ catchblock, type, catchblock->handler, &frame->ebp );
+#endif
+
+ /* setup an exception block for nested exceptions */
+
+ nested_frame.frame.handler = catch_function_nested_handler;
+ nested_frame.prev_rec = thread_data->exc_record;
+ nested_frame.cxx_frame = frame;
+ nested_frame.descr = descr;
+ nested_frame.trylevel = nested_trylevel + 1;
+
+ __wine_push_frame( &nested_frame.frame );
+ thread_data->exc_record = rec;
+ addr = call_ebp_func( catchblock->handler, &frame->ebp );
+ thread_data->exc_record = nested_frame.prev_rec;
+ __wine_pop_frame( &nested_frame.frame );
+
+ if (info->destructor) call_dtor( info->destructor, object );
+#if 0
+ TRACE( "done, continuing at %p\n", addr );
+#endif
+ return addr;
+ }
+ }
+ return NULL;
+}
+
+
+/*********************************************************************
+ * cxx_frame_handler
+ *
+ * Implementation of __CxxFrameHandler.
+ */
+static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
+ PCONTEXT exc_context, PEXCEPTION_REGISTRATION* dispatch,
+ cxx_function_descr *descr, PEXCEPTION_REGISTRATION nested_frame,
+ int nested_trylevel, CONTEXT_X86 *context )
+{
+ cxx_exception_type *exc_type;
+ void *next_ip;
+
+ if (descr->magic != CXX_FRAME_MAGIC)
+ {
+ OutputDebugString( "invalid frame magic\n" );
+ return ExceptionContinueSearch;
+ }
+ if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
+ {
+ if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 );
+ return ExceptionContinueSearch;
+ }
+ if (!descr->tryblock_count) return ExceptionContinueSearch;
+
+ exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
+ if (rec->ExceptionCode == CXX_EXCEPTION &&
+ rec->ExceptionInformation[0] > CXX_FRAME_MAGIC &&
+ exc_type->custom_handler)
+ {
+ return exc_type->custom_handler( rec, frame, exc_context, dispatch,
+ descr, nested_trylevel, nested_frame, 0 );
+ }
+
+ if (!exc_type) /* nested exception, fetch info from original exception */
+ {
+ rec = GetThreadData()->exc_record;
+ exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
+ }
+
+#if 0
+ if (TRACE_ON(seh))
+ {
+ TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p nested_frame %p\n",
+ rec, frame, frame->trylevel, descr, nested_frame );
+ dump_exception_type( exc_type );
+ dump_function_descr( descr, exc_type );
+ }
+#endif
+
+ next_ip = call_catch_block( rec, frame, descr, frame->trylevel, exc_type );
+
+ if (!next_ip) return ExceptionContinueSearch;
+ rec->ExceptionFlags &= ~EH_NONCONTINUABLE;
+ context->Eip = (DWORD)next_ip;
+ context->Ebp = (DWORD)&frame->ebp;
+ context->Esp = ((DWORD*)frame)[-1];
+ return ExceptionContinueExecution;
+}
+
+
+/*********************************************************************
+ * __CxxFrameHandler (MSVCRT.@)
+ */
+void __CxxFrameHandler( PEXCEPTION_RECORD rec, PEXCEPTION_REGISTRATION frame,
+ PCONTEXT exc_context, PEXCEPTION_REGISTRATION* dispatch,
+ CONTEXT_X86 *context )
+{
+ cxx_function_descr *descr = (cxx_function_descr *)context->Eax;
+ context->Eax = cxx_frame_handler( rec, (cxx_exception_frame *)frame,
+ exc_context, dispatch, descr, NULL, 0, context );
+}
+
+/*********************************************************************
+ * _CxxThrowException (MSVCRT.@)
+ */
+void _CxxThrowException( void *object, cxx_exception_type *type )
+{
+ DWORD args[3];
+
+ args[0] = CXX_FRAME_MAGIC;
+ args[1] = (DWORD)object;
+ args[2] = (DWORD)type;
+ RaiseException( CXX_EXCEPTION, EH_NONCONTINUABLE, 3, args );
+}
projects / reactos.git / commitdiff