208 lines
7.3 KiB
C
208 lines
7.3 KiB
C
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//===------------------------------- unwind.h -----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//
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// C++ ABI Level 1 ABI documented at:
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// https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html
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//
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//===----------------------------------------------------------------------===//
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#ifndef __UNWIND_H__
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#define __UNWIND_H__
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#include <__libunwind_config.h>
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#include <stdint.h>
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#include <stddef.h>
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#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__) && defined(_WIN32)
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#include <windows.h>
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#include <ntverp.h>
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#endif
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#if defined(__APPLE__)
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#define LIBUNWIND_UNAVAIL __attribute__ (( unavailable ))
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#else
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#define LIBUNWIND_UNAVAIL
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#endif
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typedef enum {
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_URC_NO_REASON = 0,
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_URC_OK = 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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#if defined(_LIBUNWIND_ARM_EHABI)
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_URC_FAILURE = 9
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#endif
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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 // gcc extension to C++ ABI
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} _Unwind_Action;
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typedef struct _Unwind_Context _Unwind_Context; // opaque
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#if defined(_LIBUNWIND_ARM_EHABI)
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#include "unwind_arm_ehabi.h"
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#else
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#include "unwind_itanium.h"
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#endif
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typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
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(int version,
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_Unwind_Action actions,
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_Unwind_Exception_Class exceptionClass,
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_Unwind_Exception* exceptionObject,
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struct _Unwind_Context* context,
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void* stop_parameter);
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context *context);
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extern uintptr_t
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_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context);
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#ifdef __USING_SJLJ_EXCEPTIONS__
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extern _Unwind_Reason_Code
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_Unwind_SjLj_ForcedUnwind(_Unwind_Exception *exception_object,
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_Unwind_Stop_Fn stop, void *stop_parameter);
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#else
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extern _Unwind_Reason_Code
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_Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
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_Unwind_Stop_Fn stop, void *stop_parameter);
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#endif
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#ifdef __USING_SJLJ_EXCEPTIONS__
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typedef struct _Unwind_FunctionContext *_Unwind_FunctionContext_t;
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extern void _Unwind_SjLj_Register(_Unwind_FunctionContext_t fc);
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extern void _Unwind_SjLj_Unregister(_Unwind_FunctionContext_t fc);
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#endif
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//
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// The following are semi-suppoted extensions to the C++ ABI
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//
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//
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// called by __cxa_rethrow().
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//
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#ifdef __USING_SJLJ_EXCEPTIONS__
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extern _Unwind_Reason_Code
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_Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *exception_object);
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#else
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extern _Unwind_Reason_Code
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_Unwind_Resume_or_Rethrow(_Unwind_Exception *exception_object);
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#endif
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// _Unwind_Backtrace() is a gcc extension that walks the stack and calls the
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// _Unwind_Trace_Fn once per frame until it reaches the bottom of the stack
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// or the _Unwind_Trace_Fn function returns something other than _URC_NO_REASON.
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typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context *,
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void *);
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extern _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *);
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// _Unwind_GetCFA is a gcc extension that can be called from within a
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// personality handler to get the CFA (stack pointer before call) of
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// current frame.
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extern uintptr_t _Unwind_GetCFA(struct _Unwind_Context *);
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// _Unwind_GetIPInfo is a gcc extension that can be called from within a
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// personality handler. Similar to _Unwind_GetIP() but also returns in
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// *ipBefore a non-zero value if the instruction pointer is at or before the
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// instruction causing the unwind. Normally, in a function call, the IP returned
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// is the return address which is after the call instruction and may be past the
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// end of the function containing the call instruction.
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extern uintptr_t _Unwind_GetIPInfo(struct _Unwind_Context *context,
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int *ipBefore);
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// __register_frame() is used with dynamically generated code to register the
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// FDE for a generated (JIT) code. The FDE must use pc-rel addressing to point
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// to its function and optional LSDA.
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// __register_frame() has existed in all versions of Mac OS X, but in 10.4 and
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// 10.5 it was buggy and did not actually register the FDE with the unwinder.
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// In 10.6 and later it does register properly.
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extern void __register_frame(const void *fde);
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extern void __deregister_frame(const void *fde);
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// _Unwind_Find_FDE() will locate the FDE if the pc is in some function that has
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// an associated FDE. Note, Mac OS X 10.6 and later, introduces "compact unwind
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// info" which the runtime uses in preference to DWARF unwind info. This
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// function will only work if the target function has an FDE but no compact
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// unwind info.
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struct dwarf_eh_bases {
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uintptr_t tbase;
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uintptr_t dbase;
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uintptr_t func;
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};
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extern const void *_Unwind_Find_FDE(const void *pc, struct dwarf_eh_bases *);
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// This function attempts to find the start (address of first instruction) of
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// a function given an address inside the function. It only works if the
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// function has an FDE (DWARF unwind info).
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// This function is unimplemented on Mac OS X 10.6 and later. Instead, use
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// _Unwind_Find_FDE() and look at the dwarf_eh_bases.func result.
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extern void *_Unwind_FindEnclosingFunction(void *pc);
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// Mac OS X does not support text-rel and data-rel addressing so these functions
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// are unimplemented
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extern uintptr_t _Unwind_GetDataRelBase(struct _Unwind_Context *context)
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LIBUNWIND_UNAVAIL;
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extern uintptr_t _Unwind_GetTextRelBase(struct _Unwind_Context *context)
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LIBUNWIND_UNAVAIL;
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// Mac OS X 10.4 and 10.5 had implementations of these functions in
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// libgcc_s.dylib, but they never worked.
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/// These functions are no longer available on Mac OS X.
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extern void __register_frame_info_bases(const void *fde, void *ob, void *tb,
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void *db) LIBUNWIND_UNAVAIL;
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extern void __register_frame_info(const void *fde, void *ob)
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LIBUNWIND_UNAVAIL;
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extern void __register_frame_info_table_bases(const void *fde, void *ob,
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void *tb, void *db)
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LIBUNWIND_UNAVAIL;
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extern void __register_frame_info_table(const void *fde, void *ob)
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LIBUNWIND_UNAVAIL;
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extern void __register_frame_table(const void *fde)
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LIBUNWIND_UNAVAIL;
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extern void *__deregister_frame_info(const void *fde)
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LIBUNWIND_UNAVAIL;
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extern void *__deregister_frame_info_bases(const void *fde)
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LIBUNWIND_UNAVAIL;
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#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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#ifndef _WIN32
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typedef struct _EXCEPTION_RECORD EXCEPTION_RECORD;
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typedef struct _CONTEXT CONTEXT;
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typedef struct _DISPATCHER_CONTEXT DISPATCHER_CONTEXT;
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#elif !defined(__MINGW32__) && VER_PRODUCTBUILD < 8000
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typedef struct _DISPATCHER_CONTEXT DISPATCHER_CONTEXT;
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#endif
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// This is the common wrapper for GCC-style personality functions with SEH.
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extern EXCEPTION_DISPOSITION _GCC_specific_handler(EXCEPTION_RECORD *exc,
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void *frame, CONTEXT *ctx,
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DISPATCHER_CONTEXT *disp,
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_Unwind_Personality_Fn pers);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // __UNWIND_H__
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