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libunwind: Update gcc_personality_v0.c to LLVM 19.1.0.

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Notably, this fixes libunwind compilation for thumb-windows-gnu.
This commit is contained in:
Alex Rønne Petersen 2024-09-21 01:16:47 +02:00
parent d83a3f1746
commit 9bc2185997
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1 changed files with 29 additions and 7 deletions
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36
lib/libunwind/src/gcc_personality_v0.c vendored
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@ -20,6 +20,15 @@
#include <unwind.h>
#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
#include <windows.h>
#include <winnt.h>
EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD, void *, PCONTEXT,
PDISPATCHER_CONTEXT,
_Unwind_Personality_Fn);
#endif
// Pointer encodings documented at:
// http://refspecs.freestandards.org/LSB_1.3.0/gLSB/gLSB/ehframehdr.html
@ -43,9 +52,9 @@
#define DW_EH_PE_indirect 0x80 // gcc extension
// read a uleb128 encoded value and advance pointer
static uintptr_t readULEB128(const uint8_t **data) {
uintptr_t result = 0;
uintptr_t shift = 0;
static size_t readULEB128(const uint8_t **data) {
size_t result = 0;
size_t shift = 0;
unsigned char byte;
const uint8_t *p = *data;
do {
@ -133,7 +142,7 @@ static uintptr_t readEncodedPointer(const uint8_t **data, uint8_t encoding) {
}
#if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
!defined(__ARM_DWARF_EH__)
!defined(__ARM_DWARF_EH__) && !defined(__SEH__)
#define USING_ARM_EHABI 1
_Unwind_Reason_Code __gnu_unwind_frame(struct _Unwind_Exception *,
struct _Unwind_Context *);
@ -168,6 +177,10 @@ COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_sj0(
COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_v0(
_Unwind_State state, struct _Unwind_Exception *exceptionObject,
struct _Unwind_Context *context)
#elif defined(__SEH__)
static _Unwind_Reason_Code __gcc_personality_imp(
int version, _Unwind_Action actions, uint64_t exceptionClass,
struct _Unwind_Exception *exceptionObject, struct _Unwind_Context *context)
#else
COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_v0(
int version, _Unwind_Action actions, uint64_t exceptionClass,
@ -205,14 +218,14 @@ COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_v0(
}
// Walk call-site table looking for range that includes current PC.
uint8_t callSiteEncoding = *lsda++;
uint32_t callSiteTableLength = readULEB128(&lsda);
size_t callSiteTableLength = readULEB128(&lsda);
const uint8_t *callSiteTableStart = lsda;
const uint8_t *callSiteTableEnd = callSiteTableStart + callSiteTableLength;
const uint8_t *p = callSiteTableStart;
while (p < callSiteTableEnd) {
uintptr_t start = readEncodedPointer(&p, callSiteEncoding);
uintptr_t length = readEncodedPointer(&p, callSiteEncoding);
uintptr_t landingPad = readEncodedPointer(&p, callSiteEncoding);
size_t length = readEncodedPointer(&p, callSiteEncoding);
size_t landingPad = readEncodedPointer(&p, callSiteEncoding);
readULEB128(&p); // action value not used for C code
if (landingPad == 0)
continue; // no landing pad for this entry
@ -232,3 +245,12 @@ COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_v0(
// No landing pad found, continue unwinding.
return continueUnwind(exceptionObject, context);
}
#if defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
COMPILER_RT_ABI EXCEPTION_DISPOSITION
__gcc_personality_seh0(PEXCEPTION_RECORD ms_exc, void *this_frame,
PCONTEXT ms_orig_context, PDISPATCHER_CONTEXT ms_disp) {
return _GCC_specific_handler(ms_exc, this_frame, ms_orig_context, ms_disp,
__gcc_personality_imp);
}
#endif