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Cleanup and enable external unwinding for more platforms.

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This commit is contained in:
Mike Pall 2021-03-23 00:22:34 +01:00
parent ce9faf2e0d
commit e131936133
4 changed files with 197 additions and 190 deletions
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22
doc/extensions.html
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@ -392,29 +392,19 @@ the toolchain used to compile LuaJIT:
<td class="excinterop">Interoperability</td> <td class="excinterop">Interoperability</td>
</tr> </tr>
<tr class="odd separate"> <tr class="odd separate">
<td class="excplatform">POSIX/x64, DWARF2 unwinding</td> <td class="excplatform">External frame unwinding</td>
<td class="exccompiler">GCC 4.3+, Clang</td> <td class="exccompiler">GCC, Clang, MSVC</td>
<td class="excinterop"><b style="color: #00a000;">Full</b></td> <td class="excinterop"><b style="color: #00a000;">Full</b></td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td class="excplatform">ARM <tt>-DLUAJIT_UNWIND_EXTERNAL</tt></td> <td class="excplatform">Internal frame unwinding + DWARF2</td>
<td class="exccompiler">GCC, Clang</td>
<td class="excinterop"><b style="color: #00a000;">Full</b></td>
</tr>
<tr class="odd">
<td class="excplatform">Other platforms, DWARF2 unwinding</td>
<td class="exccompiler">GCC, Clang</td> <td class="exccompiler">GCC, Clang</td>
<td class="excinterop"><b style="color: #c06000;">Limited</b></td> <td class="excinterop"><b style="color: #c06000;">Limited</b></td>
</tr> </tr>
<tr class="even">
<td class="excplatform">Windows/x64</td>
<td class="exccompiler">MSVC</td>
<td class="excinterop"><b style="color: #00a000;">Full</b></td>
</tr>
<tr class="odd"> <tr class="odd">
<td class="excplatform">Windows/x86</td> <td class="excplatform">Windows 64 bit</td>
<td class="exccompiler">Any</td> <td class="exccompiler">non-MSVC</td>
<td class="excinterop"><b style="color: #00a000;">Full</b></td> <td class="excinterop"><b style="color: #c06000;">Limited</b></td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td class="excplatform">Other platforms</td> <td class="excplatform">Other platforms</td>

11
src/Makefile
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@ -314,6 +314,13 @@ else
ifeq (,$(shell $(TARGET_CC) -o /dev/null -c -x c /dev/null -fno-stack-protector 2>/dev/null || echo 1)) ifeq (,$(shell $(TARGET_CC) -o /dev/null -c -x c /dev/null -fno-stack-protector 2>/dev/null || echo 1))
TARGET_XCFLAGS+= -fno-stack-protector TARGET_XCFLAGS+= -fno-stack-protector
endif endif
ifeq (,$(findstring LJ_NO_UNWIND 1,$(TARGET_TESTARCH)))
# Find out whether the target toolchain always generates unwind tables.
TARGET_TESTUNWIND=$(shell exec 2>/dev/null; echo 'extern void b(void);int a(void){b();return 0;}' | $(TARGET_CC) -c -x c - -o tmpunwind.o && grep -qa -e eh_frame -e __unwind_info tmpunwind.o && echo E; rm -f tmpunwind.o)
ifneq (,$(findstring E,$(TARGET_TESTUNWIND)))
TARGET_XCFLAGS+= -DLUAJIT_UNWIND_EXTERNAL
endif
endif
ifeq (Darwin,$(TARGET_SYS)) ifeq (Darwin,$(TARGET_SYS))
ifeq (,$(MACOSX_DEPLOYMENT_TARGET)) ifeq (,$(MACOSX_DEPLOYMENT_TARGET))
$(error missing: export MACOSX_DEPLOYMENT_TARGET=XX.YY) $(error missing: export MACOSX_DEPLOYMENT_TARGET=XX.YY)
@ -322,10 +329,6 @@ ifeq (Darwin,$(TARGET_SYS))
TARGET_XSHLDFLAGS= -dynamiclib -single_module -undefined dynamic_lookup -fPIC TARGET_XSHLDFLAGS= -dynamiclib -single_module -undefined dynamic_lookup -fPIC
TARGET_DYNXLDOPTS= TARGET_DYNXLDOPTS=
TARGET_XSHLDFLAGS+= -install_name $(TARGET_DYLIBPATH) -compatibility_version $(MAJVER).$(MINVER) -current_version $(MAJVER).$(MINVER).$(RELVER) TARGET_XSHLDFLAGS+= -install_name $(TARGET_DYLIBPATH) -compatibility_version $(MAJVER).$(MINVER) -current_version $(MAJVER).$(MINVER).$(RELVER)
ifeq (x64,$(TARGET_LJARCH))
TARGET_XLDFLAGS+= -pagezero_size 10000 -image_base 100000000
TARGET_XSHLDFLAGS+= -image_base 7fff04c4a000
endif
else else
ifeq (iOS,$(TARGET_SYS)) ifeq (iOS,$(TARGET_SYS))
TARGET_STRIP+= -x TARGET_STRIP+= -x

33
src/lj_arch.h
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@ -170,11 +170,6 @@
#define LJ_ARCH_NAME "x86" #define LJ_ARCH_NAME "x86"
#define LJ_ARCH_BITS 32 #define LJ_ARCH_BITS 32
#define LJ_ARCH_ENDIAN LUAJIT_LE #define LJ_ARCH_ENDIAN LUAJIT_LE
#if LJ_TARGET_WINDOWS || LJ_TARGET_CYGWIN
#define LJ_ABI_WIN 1
#else
#define LJ_ABI_WIN 0
#endif
#define LJ_TARGET_X86 1 #define LJ_TARGET_X86 1
#define LJ_TARGET_X86ORX64 1 #define LJ_TARGET_X86ORX64 1
#define LJ_TARGET_EHRETREG 0 #define LJ_TARGET_EHRETREG 0
@ -188,11 +183,6 @@
#define LJ_ARCH_NAME "x64" #define LJ_ARCH_NAME "x64"
#define LJ_ARCH_BITS 64 #define LJ_ARCH_BITS 64
#define LJ_ARCH_ENDIAN LUAJIT_LE #define LJ_ARCH_ENDIAN LUAJIT_LE
#if LJ_TARGET_WINDOWS || LJ_TARGET_CYGWIN
#define LJ_ABI_WIN 1
#else
#define LJ_ABI_WIN 0
#endif
#define LJ_TARGET_X64 1 #define LJ_TARGET_X64 1
#define LJ_TARGET_X86ORX64 1 #define LJ_TARGET_X86ORX64 1
#define LJ_TARGET_EHRETREG 0 #define LJ_TARGET_EHRETREG 0
@ -203,6 +193,8 @@
#define LJ_ARCH_NUMMODE LJ_NUMMODE_SINGLE_DUAL #define LJ_ARCH_NUMMODE LJ_NUMMODE_SINGLE_DUAL
#ifndef LUAJIT_DISABLE_GC64 #ifndef LUAJIT_DISABLE_GC64
#define LJ_TARGET_GC64 1 #define LJ_TARGET_GC64 1
#elif LJ_TARGET_OSX
#error "macOS requires GC64 -- don't disable it"
#endif #endif
#elif LUAJIT_TARGET == LUAJIT_ARCH_ARM #elif LUAJIT_TARGET == LUAJIT_ARCH_ARM
@ -611,13 +603,10 @@
#define LJ_NO_SYSTEM 1 #define LJ_NO_SYSTEM 1
#endif #endif
#if !defined(LUAJIT_NO_UNWIND) && __GNU_COMPACT_EH__ #if LJ_TARGET_WINDOWS || LJ_TARGET_CYGWIN
/* NYI: no support for compact unwind specification, yet. */ #define LJ_ABI_WIN 1
#define LUAJIT_NO_UNWIND 1 #else
#endif #define LJ_ABI_WIN 0
#if defined(LUAJIT_NO_UNWIND) || defined(__symbian__) || LJ_TARGET_IOS || LJ_TARGET_PS3 || LJ_TARGET_PS4
#define LJ_NO_UNWIND 1
#endif #endif
#if LJ_TARGET_WINDOWS #if LJ_TARGET_WINDOWS
@ -632,6 +621,16 @@ extern void *LJ_WIN_LOADLIBA(const char *path);
#endif #endif
#endif #endif
#if defined(LUAJIT_NO_UNWIND) || __GNU_COMPACT_EH__ || defined(__symbian__) || LJ_TARGET_IOS || LJ_TARGET_PS3 || LJ_TARGET_PS4
#define LJ_NO_UNWIND 1
#endif
#if !LJ_NO_UNWIND && !defined(LUAJIT_UNWIND_INTERNAL) && (LJ_ABI_WIN || (defined(LUAJIT_UNWIND_EXTERNAL) && (defined(__GNUC__) || defined(__clang__))))
#define LJ_UNWIND_EXT 1
#else
#define LJ_UNWIND_EXT 0
#endif
/* Compatibility with Lua 5.1 vs. 5.2. */ /* Compatibility with Lua 5.1 vs. 5.2. */
#ifdef LUAJIT_ENABLE_LUA52COMPAT #ifdef LUAJIT_ENABLE_LUA52COMPAT
#define LJ_52 1 #define LJ_52 1

321
src/lj_err.c
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@ -29,12 +29,18 @@
** Pros and Cons: ** Pros and Cons:
** **
** - EXT requires unwind tables for *all* functions on the C stack between ** - EXT requires unwind tables for *all* functions on the C stack between
** the pcall/catch and the error/throw. This is the default on x64, ** the pcall/catch and the error/throw. C modules used by Lua code can
** but needs to be manually enabled on x86/PPC for non-C++ code. ** throw errors, so these need to have unwind tables, too. Transitively
** this applies to all system libraries used by C modules -- at least
** when they have callbacks which may throw an error.
** **
** - INT is faster when actually throwing errors (but this happens rarely). ** - INT is faster when actually throwing errors, but this happens rarely.
** Setting up error handlers is zero-cost in any case. ** Setting up error handlers is zero-cost in any case.
** **
** - INT needs to save *all* callee-saved registers when entering the
** interpreter. EXT only needs to save those actually used inside the
** interpreter. JIT-compiled code may need to save some more.
**
** - EXT provides full interoperability with C++ exceptions. You can throw ** - EXT provides full interoperability with C++ exceptions. You can throw
** Lua errors or C++ exceptions through a mix of Lua frames and C++ frames. ** Lua errors or C++ exceptions through a mix of Lua frames and C++ frames.
** C++ destructors are called as needed. C++ exceptions caught by pcall ** C++ destructors are called as needed. C++ exceptions caught by pcall
@ -46,27 +52,33 @@
** the wrapper function feature. Lua errors thrown through C++ frames ** the wrapper function feature. Lua errors thrown through C++ frames
** cannot be caught by C++ code and C++ destructors are not run. ** cannot be caught by C++ code and C++ destructors are not run.
** **
** EXT is the default on x64 systems and on Windows, INT is the default on all ** EXT is the default on all systems where the toolchain produces unwind
** other systems. ** tables by default (*). This is hard-coded and/or detected in src/Makefile.
** You can thwart the detection with: TARGET_XCFLAGS=-DLUAJIT_UNWIND_INTERNAL
** **
** EXT can be manually enabled on POSIX systems using GCC and DWARF2 stack ** INT is the default on all other systems.
** unwinding with -DLUAJIT_UNWIND_EXTERNAL. *All* C code must be compiled
** with -funwind-tables (or -fexceptions). This includes LuaJIT itself (set
** TARGET_CFLAGS), all of your C/Lua binding code, all loadable C modules
** and all C libraries that have callbacks which may be used to call back
** into Lua. C++ code must *not* be compiled with -fno-exceptions.
** **
** EXT is mandatory on WIN64 since the calling convention has an abundance ** EXT can be manually enabled for toolchains that are able to produce
** of callee-saved registers (rbx, rbp, rsi, rdi, r12-r15, xmm6-xmm15). ** conforming unwind tables:
** The POSIX/x64 interpreter only saves r12/r13 for INT (e.g. PS4). ** "TARGET_XCFLAGS=-funwind-tables -DLUAJIT_UNWIND_EXTERNAL"
** As explained above, *all* C code used directly or indirectly by LuaJIT
** must be compiled with -funwind-tables (or -fexceptions). C++ code must
** *not* be compiled with -fno-exceptions.
**
** If you're unsure whether error handling inside the VM works correctly,
** try running this and check whether it prints "OK":
**
** luajit -e "print(select(2, load('OK')):match('OK'))"
**
** (*) Originally, toolchains only generated unwind tables for C++ code. For
** interoperability reasons, this can be manually enabled for plain C code,
** too (with -funwind-tables). With the introduction of the x64 architecture,
** the corresponding POSIX and Windows ABIs mandated unwind tables for all
** code. Over the following years most desktop and server platforms have
** enabled unwind tables by default on all architectures. OTOH mobile and
** embedded platforms do not consistently mandate unwind tables.
*/ */
#if (defined(__GNUC__) || defined(__clang__)) && (LJ_TARGET_X64 || defined(LUAJIT_UNWIND_EXTERNAL)) && !LJ_NO_UNWIND
#define LJ_UNWIND_EXT 1
#elif LJ_TARGET_WINDOWS
#define LJ_UNWIND_EXT 1
#endif
/* -- Error messages ------------------------------------------------------ */ /* -- Error messages ------------------------------------------------------ */
/* Error message strings. */ /* Error message strings. */
@ -184,7 +196,125 @@ static void *err_unwind(lua_State *L, void *stopcf, int errcode)
/* -- External frame unwinding -------------------------------------------- */ /* -- External frame unwinding -------------------------------------------- */
#if (defined(__GNUC__) || defined(__clang__)) && !LJ_NO_UNWIND && !LJ_ABI_WIN #if LJ_ABI_WIN
/*
** Someone in Redmond owes me several days of my life. A lot of this is
** undocumented or just plain wrong on MSDN. Some of it can be gathered
** from 3rd party docs or must be found by trial-and-error. They really
** don't want you to write your own language-specific exception handler
** or to interact gracefully with MSVC. :-(
**
** Apparently MSVC doesn't call C++ destructors for foreign exceptions
** unless you compile your C++ code with /EHa. Unfortunately this means
** catch (...) also catches things like access violations. The use of
** _set_se_translator doesn't really help, because it requires /EHa, too.
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#if LJ_TARGET_X86
typedef void *UndocumentedDispatcherContext; /* Unused on x86. */
#else
/* Taken from: http://www.nynaeve.net/?p=99 */
typedef struct UndocumentedDispatcherContext {
ULONG64 ControlPc;
ULONG64 ImageBase;
PRUNTIME_FUNCTION FunctionEntry;
ULONG64 EstablisherFrame;
ULONG64 TargetIp;
PCONTEXT ContextRecord;
void (*LanguageHandler)(void);
PVOID HandlerData;
PUNWIND_HISTORY_TABLE HistoryTable;
ULONG ScopeIndex;
ULONG Fill0;
} UndocumentedDispatcherContext;
#endif
/* Another wild guess. */
extern void __DestructExceptionObject(EXCEPTION_RECORD *rec, int nothrow);
#if LJ_TARGET_X64 && defined(MINGW_SDK_INIT)
/* Workaround for broken MinGW64 declaration. */
VOID RtlUnwindEx_FIXED(PVOID,PVOID,PVOID,PVOID,PVOID,PVOID) asm("RtlUnwindEx");
#define RtlUnwindEx RtlUnwindEx_FIXED
#endif
#define LJ_MSVC_EXCODE ((DWORD)0xe06d7363)
#define LJ_GCC_EXCODE ((DWORD)0x20474343)
#define LJ_EXCODE ((DWORD)0xe24c4a00)
#define LJ_EXCODE_MAKE(c) (LJ_EXCODE | (DWORD)(c))
#define LJ_EXCODE_CHECK(cl) (((cl) ^ LJ_EXCODE) <= 0xff)
#define LJ_EXCODE_ERRCODE(cl) ((int)((cl) & 0xff))
/* Windows exception handler for interpreter frame. */
LJ_FUNCA int lj_err_unwind_win(EXCEPTION_RECORD *rec,
void *f, CONTEXT *ctx, UndocumentedDispatcherContext *dispatch)
{
#if LJ_TARGET_X86
void *cf = (char *)f - CFRAME_OFS_SEH;
#else
void *cf = f;
#endif
lua_State *L = cframe_L(cf);
int errcode = LJ_EXCODE_CHECK(rec->ExceptionCode) ?
LJ_EXCODE_ERRCODE(rec->ExceptionCode) : LUA_ERRRUN;
if ((rec->ExceptionFlags & 6)) { /* EH_UNWINDING|EH_EXIT_UNWIND */
/* Unwind internal frames. */
err_unwind(L, cf, errcode);
} else {
void *cf2 = err_unwind(L, cf, 0);
if (cf2) { /* We catch it, so start unwinding the upper frames. */
if (rec->ExceptionCode == LJ_MSVC_EXCODE ||
rec->ExceptionCode == LJ_GCC_EXCODE) {
#if !LJ_TARGET_CYGWIN
__DestructExceptionObject(rec, 1);
#endif
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
} else if (!LJ_EXCODE_CHECK(rec->ExceptionCode)) {
/* Don't catch access violations etc. */
return 1; /* ExceptionContinueSearch */
}
#if LJ_TARGET_X86
UNUSED(ctx);
UNUSED(dispatch);
/* Call all handlers for all lower C frames (including ourselves) again
** with EH_UNWINDING set. Then call the specified function, passing cf
** and errcode.
*/
lj_vm_rtlunwind(cf, (void *)rec,
(cframe_unwind_ff(cf2) && errcode != LUA_YIELD) ?
(void *)lj_vm_unwind_ff : (void *)lj_vm_unwind_c, errcode);
/* lj_vm_rtlunwind does not return. */
#else
/* Unwind the stack and call all handlers for all lower C frames
** (including ourselves) again with EH_UNWINDING set. Then set
** stack pointer = cf, result = errcode and jump to the specified target.
*/
RtlUnwindEx(cf, (void *)((cframe_unwind_ff(cf2) && errcode != LUA_YIELD) ?
lj_vm_unwind_ff_eh :
lj_vm_unwind_c_eh),
rec, (void *)(uintptr_t)errcode, ctx, dispatch->HistoryTable);
/* RtlUnwindEx should never return. */
#endif
}
}
return 1; /* ExceptionContinueSearch */
}
/* Raise Windows exception. */
static void err_raise_ext(global_State *g, int errcode)
{
#if LJ_HASJIT
setmref(g->jit_base, NULL);
#endif
RaiseException(LJ_EXCODE_MAKE(errcode), 1 /* EH_NONCONTINUABLE */, 0, NULL);
}
#elif !LJ_NO_UNWIND && (defined(__GNUC__) || defined(__clang__))
/* /*
** We have to use our own definitions instead of the mandatory (!) unwind.h, ** We have to use our own definitions instead of the mandatory (!) unwind.h,
@ -233,7 +363,6 @@ LJ_FUNCA int lj_err_unwind_dwarf(int version, int actions,
lua_State *L; lua_State *L;
if (version != 1) if (version != 1)
return _URC_FATAL_PHASE1_ERROR; return _URC_FATAL_PHASE1_ERROR;
UNUSED(uexclass);
cf = (void *)_Unwind_GetCFA(ctx); cf = (void *)_Unwind_GetCFA(ctx);
L = cframe_L(cf); L = cframe_L(cf);
if ((actions & _UA_SEARCH_PHASE)) { if ((actions & _UA_SEARCH_PHASE)) {
@ -281,6 +410,9 @@ LJ_FUNCA int lj_err_unwind_dwarf(int version, int actions,
** it on non-x64 because the interpreter restores all callee-saved regs. ** it on non-x64 because the interpreter restores all callee-saved regs.
*/ */
lj_err_throw(L, errcode); lj_err_throw(L, errcode);
#if LJ_TARGET_X64
#error "Broken build system -- only use the provided Makefiles!"
#endif
#endif #endif
} }
return _URC_CONTINUE_UNWIND; return _URC_CONTINUE_UNWIND;
@ -288,14 +420,6 @@ LJ_FUNCA int lj_err_unwind_dwarf(int version, int actions,
#if LJ_UNWIND_EXT #if LJ_UNWIND_EXT
static __thread _Unwind_Exception static_uex; static __thread _Unwind_Exception static_uex;
/* Raise DWARF2 exception. */
static void err_raise_ext(int errcode)
{
static_uex.exclass = LJ_UEXCLASS_MAKE(errcode);
static_uex.excleanup = NULL;
_Unwind_RaiseException(&static_uex);
}
#endif #endif
#else /* LJ_TARGET_ARM */ #else /* LJ_TARGET_ARM */
@ -369,132 +493,22 @@ LJ_FUNCA int lj_err_unwind_arm(int state, _Unwind_Control_Block *ucb,
#if LJ_UNWIND_EXT #if LJ_UNWIND_EXT
static __thread _Unwind_Control_Block static_uex; static __thread _Unwind_Control_Block static_uex;
#endif
#endif /* LJ_TARGET_ARM */
static void err_raise_ext(int errcode) #if LJ_UNWIND_EXT
/* Raise external exception. */
static void err_raise_ext(global_State *g, int errcode)
{ {
#if LJ_HASJIT
setmref(g->jit_base, NULL);
#endif
memset(&static_uex, 0, sizeof(static_uex)); memset(&static_uex, 0, sizeof(static_uex));
static_uex.exclass = LJ_UEXCLASS_MAKE(errcode); static_uex.exclass = LJ_UEXCLASS_MAKE(errcode);
_Unwind_RaiseException(&static_uex); _Unwind_RaiseException(&static_uex);
} }
#endif #endif
#endif /* LJ_TARGET_ARM */
#elif LJ_ABI_WIN
/*
** Someone in Redmond owes me several days of my life. A lot of this is
** undocumented or just plain wrong on MSDN. Some of it can be gathered
** from 3rd party docs or must be found by trial-and-error. They really
** don't want you to write your own language-specific exception handler
** or to interact gracefully with MSVC. :-(
**
** Apparently MSVC doesn't call C++ destructors for foreign exceptions
** unless you compile your C++ code with /EHa. Unfortunately this means
** catch (...) also catches things like access violations. The use of
** _set_se_translator doesn't really help, because it requires /EHa, too.
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#if LJ_TARGET_X64
/* Taken from: http://www.nynaeve.net/?p=99 */
typedef struct UndocumentedDispatcherContext {
ULONG64 ControlPc;
ULONG64 ImageBase;
PRUNTIME_FUNCTION FunctionEntry;
ULONG64 EstablisherFrame;
ULONG64 TargetIp;
PCONTEXT ContextRecord;
void (*LanguageHandler)(void);
PVOID HandlerData;
PUNWIND_HISTORY_TABLE HistoryTable;
ULONG ScopeIndex;
ULONG Fill0;
} UndocumentedDispatcherContext;
#else
typedef void *UndocumentedDispatcherContext;
#endif
/* Another wild guess. */
extern void __DestructExceptionObject(EXCEPTION_RECORD *rec, int nothrow);
#if LJ_TARGET_X64 && defined(MINGW_SDK_INIT)
/* Workaround for broken MinGW64 declaration. */
VOID RtlUnwindEx_FIXED(PVOID,PVOID,PVOID,PVOID,PVOID,PVOID) asm("RtlUnwindEx");
#define RtlUnwindEx RtlUnwindEx_FIXED
#endif
#define LJ_MSVC_EXCODE ((DWORD)0xe06d7363)
#define LJ_GCC_EXCODE ((DWORD)0x20474343)
#define LJ_EXCODE ((DWORD)0xe24c4a00)
#define LJ_EXCODE_MAKE(c) (LJ_EXCODE | (DWORD)(c))
#define LJ_EXCODE_CHECK(cl) (((cl) ^ LJ_EXCODE) <= 0xff)
#define LJ_EXCODE_ERRCODE(cl) ((int)((cl) & 0xff))
/* Windows exception handler for interpreter frame. */
LJ_FUNCA int lj_err_unwind_win(EXCEPTION_RECORD *rec,
void *f, CONTEXT *ctx, UndocumentedDispatcherContext *dispatch)
{
#if LJ_TARGET_X64
void *cf = f;
#else
void *cf = (char *)f - CFRAME_OFS_SEH;
#endif
lua_State *L = cframe_L(cf);
int errcode = LJ_EXCODE_CHECK(rec->ExceptionCode) ?
LJ_EXCODE_ERRCODE(rec->ExceptionCode) : LUA_ERRRUN;
if ((rec->ExceptionFlags & 6)) { /* EH_UNWINDING|EH_EXIT_UNWIND */
/* Unwind internal frames. */
err_unwind(L, cf, errcode);
} else {
void *cf2 = err_unwind(L, cf, 0);
if (cf2) { /* We catch it, so start unwinding the upper frames. */
if (rec->ExceptionCode == LJ_MSVC_EXCODE ||
rec->ExceptionCode == LJ_GCC_EXCODE) {
#if LJ_TARGET_WINDOWS
__DestructExceptionObject(rec, 1);
#endif
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
} else if (!LJ_EXCODE_CHECK(rec->ExceptionCode)) {
/* Don't catch access violations etc. */
return 1; /* ExceptionContinueSearch */
}
#if LJ_TARGET_X64
/* Unwind the stack and call all handlers for all lower C frames
** (including ourselves) again with EH_UNWINDING set. Then set
** rsp = cf, rax = errcode and jump to the specified target.
*/
RtlUnwindEx(cf, (void *)((cframe_unwind_ff(cf2) && errcode != LUA_YIELD) ?
lj_vm_unwind_ff_eh :
lj_vm_unwind_c_eh),
rec, (void *)(uintptr_t)errcode, ctx, dispatch->HistoryTable);
/* RtlUnwindEx should never return. */
#else
UNUSED(ctx);
UNUSED(dispatch);
/* Call all handlers for all lower C frames (including ourselves) again
** with EH_UNWINDING set. Then call the specified function, passing cf
** and errcode.
*/
lj_vm_rtlunwind(cf, (void *)rec,
(cframe_unwind_ff(cf2) && errcode != LUA_YIELD) ?
(void *)lj_vm_unwind_ff : (void *)lj_vm_unwind_c, errcode);
/* lj_vm_rtlunwind does not return. */
#endif
}
}
return 1; /* ExceptionContinueSearch */
}
/* Raise Windows exception. */
static void err_raise_ext(int errcode)
{
RaiseException(LJ_EXCODE_MAKE(errcode), 1 /* EH_NONCONTINUABLE */, 0, NULL);
}
#endif #endif
/* -- Error handling ------------------------------------------------------ */ /* -- Error handling ------------------------------------------------------ */
@ -504,22 +518,23 @@ LJ_NOINLINE void LJ_FASTCALL lj_err_throw(lua_State *L, int errcode)
{ {
global_State *g = G(L); global_State *g = G(L);
lj_trace_abort(g); lj_trace_abort(g);
setmref(g->jit_base, NULL);
L->status = LUA_OK; L->status = LUA_OK;
#if LJ_UNWIND_EXT #if LJ_UNWIND_EXT
err_raise_ext(errcode); err_raise_ext(g, errcode);
/* /*
** A return from this function signals a corrupt C stack that cannot be ** A return from this function signals a corrupt C stack that cannot be
** unwound. We have no choice but to call the panic function and exit. ** unwound. We have no choice but to call the panic function and exit.
** **
** Usually this is caused by a C function without unwind information. ** Usually this is caused by a C function without unwind information.
** This should never happen on x64, but may happen if you've manually ** This may happen if you've manually enabled LUAJIT_UNWIND_EXTERNAL
** enabled LUAJIT_UNWIND_EXTERNAL and forgot to recompile *every* ** and forgot to recompile *every* non-C++ file with -funwind-tables.
** non-C++ file with -funwind-tables.
*/ */
if (G(L)->panic) if (G(L)->panic)
G(L)->panic(L); G(L)->panic(L);
#else #else
#if LJ_HASJIT
setmref(g->jit_base, NULL);
#endif
{ {
void *cf = err_unwind(L, NULL, errcode); void *cf = err_unwind(L, NULL, errcode);
if (cframe_unwind_ff(cf)) if (cframe_unwind_ff(cf))