patches/v8_source_portability.patch

# What: make upstream V8 sources build cleanly in this hermetic toolchain setup.
# Scope: minimal source-level portability fixes only, such as libexecinfo guards,
# weak glibc symbol handling, and warning annotations; no dependency
# include-path rewrites or intentional V8 feature changes.
diff --git a/orig/v8-15.0.245.2/src/base/bits.h b/mod/v8-15.0.245.2/src/base/bits.h
index 179a10f..4791e96 100644
--- a/orig/v8-15.0.245.2/src/base/bits.h
+++ b/mod/v8-15.0.245.2/src/base/bits.h
@@ -270,11 +270,17 @@ inline constexpr uint32_t RoundDownToPowerOfTwo32(uint32_t value) {
 }
 
 // Precondition: 0 <= shift < 32
+#ifdef RotateRight32
+#undef RotateRight32
+#endif
 inline constexpr uint32_t RotateRight32(uint32_t value, uint32_t shift) {
   return (value >> shift) | (value << ((32 - shift) & 31));
 }
 
 // Precondition: 0 <= shift < 32
+#ifdef RotateLeft32
+#undef RotateLeft32
+#endif
 inline constexpr uint32_t RotateLeft32(uint32_t value, uint32_t shift) {
   return (value << shift) | (value >> ((32 - shift) & 31));
 }
diff --git a/orig/v8-15.0.245.2/src/base/debug/stack_trace_posix.cc b/mod/v8-15.0.245.2/src/base/debug/stack_trace_posix.cc
index 6176ed4..a02043d 100644
--- a/orig/v8-15.0.245.2/src/base/debug/stack_trace_posix.cc
+++ b/mod/v8-15.0.245.2/src/base/debug/stack_trace_posix.cc
@@ -64,6 +64,7 @@ namespace {
 volatile sig_atomic_t in_signal_handler = 0;
 bool dump_stack_in_signal_handler = true;
 
+#if HAVE_EXECINFO_H
 // The prefix used for mangled symbols, per the Itanium C++ ABI:
 // http://www.codesourcery.com/cxx-abi/abi.html#mangling
 const char kMangledSymbolPrefix[] = "_Z";
@@ -73,7 +74,6 @@ const char kMangledSymbolPrefix[] = "_Z";
 const char kSymbolCharacters[] =
     "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
 
-#if HAVE_EXECINFO_H
 // Demangles C++ symbols in the given text. Example:
 //
 // "out/Debug/base_unittests(_ZN10StackTraceC1Ev+0x20) [0x817778c]"
diff --git a/orig/v8-15.0.245.2/src/base/export-template.h b/mod/v8-15.0.245.2/src/base/export-template.h
index 861cfe4..1e73954 100644
--- a/orig/v8-15.0.245.2/src/base/export-template.h
+++ b/mod/v8-15.0.245.2/src/base/export-template.h
@@ -153,8 +153,10 @@
 
 EXPORT_TEMPLATE_TEST(DEFAULT, );
 EXPORT_TEMPLATE_TEST(DEFAULT, __attribute__((visibility("default"))));
+#if defined(_MSC_VER)
 EXPORT_TEMPLATE_TEST(MSVC_HACK, __declspec(dllexport));
 EXPORT_TEMPLATE_TEST(DEFAULT, __declspec(dllimport));
+#endif
 
 #undef EXPORT_TEMPLATE_TEST
 #undef EXPORT_TEMPLATE_TEST_DEFAULT_DEFAULT
diff --git a/orig/v8-15.0.245.2/src/base/platform/platform-posix.cc b/mod/v8-15.0.245.2/src/base/platform/platform-posix.cc
index dfb30b6..6ce12a5 100644
--- a/orig/v8-15.0.245.2/src/base/platform/platform-posix.cc
+++ b/mod/v8-15.0.245.2/src/base/platform/platform-posix.cc
@@ -95,7 +95,7 @@ extern int madvise(caddr_t, size_t, int);
 #endif
 
 #if defined(V8_LIBC_GLIBC)
-extern "C" void* __libc_stack_end;
+extern "C" void* __libc_stack_end V8_WEAK;
 #endif
 
 namespace v8 {
@@ -1476,7 +1476,8 @@ Stack::StackSlot Stack::ObtainCurrentThreadStackStart() {
   // __libc_stack_end is process global and thus is only valid for
   // the main thread. Check whether this is the main thread by checking
   // __libc_stack_end is within the thread's stack.
-  if ((base <= __libc_stack_end) && (__libc_stack_end <= stack_start)) {
+  if (__libc_stack_end != nullptr &&
+      (base <= __libc_stack_end) && (__libc_stack_end <= stack_start)) {
     DCHECK(MainThreadIsCurrentThread());
     return __libc_stack_end;
   }
diff --git a/orig/v8-15.0.245.2/src/base/platform/platform-win32.cc b/mod/v8-15.0.245.2/src/base/platform/platform-win32.cc
index 11f9772..854a682 100644
--- a/orig/v8-15.0.245.2/src/base/platform/platform-win32.cc
+++ b/mod/v8-15.0.245.2/src/base/platform/platform-win32.cc
@@ -20,7 +20,11 @@
 #include <windows.h>
 
 // This has to come after windows.h.
+#ifdef __MINGW32__
+#include <versionhelpers.h>
+#else
 #include <VersionHelpers.h>
+#endif
 #include <dbghelp.h>            // For SymLoadModule64 and al.
 #include <malloc.h>             // For _msize()
 #include <mmsystem.h>           // For timeGetTime().
@@ -69,9 +73,7 @@ static_assert(offsetof(V8_CRITICAL_SECTION, SpinCount) ==
 // Extra functions for MinGW. Most of these are the _s functions which are in
 // the Microsoft Visual Studio C++ CRT.
 #ifdef __MINGW32__
-
-
-#ifndef __MINGW64_VERSION_MAJOR
+#if !defined(__MINGW64_VERSION_MAJOR)
 
 #define _TRUNCATE 0
 #define STRUNCATE 80
@@ -81,9 +83,6 @@ inline void MemoryFence() {
   __asm__ __volatile__("xchgl %%eax,%0 ":"=r" (barrier));
 }
 
-#endif  // __MINGW64_VERSION_MAJOR
-
-
 int localtime_s(tm* out_tm, const time_t* time) {
   tm* posix_local_time_struct = localtime_r(time, out_tm);
   if (posix_local_time_struct == nullptr) return 1;
@@ -134,6 +133,8 @@ int strncpy_s(char* dest, size_t dest_size, const char* source, size_t count) {
   return 0;
 }
 
+#endif  // !defined(__MINGW64_VERSION_MAJOR)
+
 #endif  // __MINGW32__
 
 namespace v8 {
@@ -743,8 +744,10 @@ void OS::StrNCpy(char* dest, int length, const char* src, size_t n) {
 }
 
 
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
 #undef _TRUNCATE
 #undef STRUNCATE
+#endif
 
 DEFINE_LAZY_LEAKY_OBJECT_GETTER(RandomNumberGenerator,
                                 GetPlatformRandomNumberGenerator)
@@ -1943,3 +1946,4 @@ Stack::StackSlot Stack::GetCurrentStackPosition() {
 
 }  // namespace base
 }  // namespace v8
+
diff --git a/orig/v8-15.0.245.2/src/base/platform/time.cc b/mod/v8-15.0.245.2/src/base/platform/time.cc
index 8c824e3..f8144d0 100644
--- a/orig/v8-15.0.245.2/src/base/platform/time.cc
+++ b/mod/v8-15.0.245.2/src/base/platform/time.cc
@@ -782,12 +782,12 @@ bool ThreadTicks::IsSupported() {
 #elif defined(__PASE__)
   // Thread CPU time accounting is unavailable in PASE
   return false;
+#elif defined(V8_OS_WIN)
+  return IsSupportedWin();
 #elif (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \
     defined(V8_OS_DARWIN) || defined(V8_OS_ANDROID) ||                    \
     defined(V8_OS_SOLARIS) || defined(V8_OS_ZOS)
   return true;
-#elif defined(V8_OS_WIN)
-  return IsSupportedWin();
 #else
   return false;
 #endif
@@ -804,13 +804,13 @@ ThreadTicks ThreadTicks::Now() {
   return ThreadTicks(ComputeThreadTicks());
 #elif V8_OS_FUCHSIA
   return ThreadTicks(GetFuchsiaThreadTicks());
+#elif V8_OS_WIN
+  return ThreadTicks::GetForThread(::GetCurrentThread());
 #elif (defined(_POSIX_THREAD_CPUTIME) && (_POSIX_THREAD_CPUTIME >= 0)) || \
     defined(V8_OS_ANDROID) || defined(V8_OS_ZOS)
   return ThreadTicks(ClockNow(CLOCK_THREAD_CPUTIME_ID));
 #elif V8_OS_SOLARIS
   return ThreadTicks(gethrvtime() / Time::kNanosecondsPerMicrosecond);
-#elif V8_OS_WIN
-  return ThreadTicks::GetForThread(::GetCurrentThread());
 #else
   UNREACHABLE();
 #endif
diff --git a/orig/v8-15.0.245.2/src/heap/base/asm/x64/push_registers_masm.asm b/mod/v8-15.0.245.2/src/heap/base/asm/x64/push_registers_masm.asm
index d0d0563..f3f5952 100644
--- a/orig/v8-15.0.245.2/src/heap/base/asm/x64/push_registers_masm.asm
+++ b/mod/v8-15.0.245.2/src/heap/base/asm/x64/push_registers_masm.asm
@@ -1,70 +1,47 @@
-;; Copyright 2020 the V8 project authors. All rights reserved.
-;; Use of this source code is governed by a BSD-style license that can be
-;; found in the LICENSE file.
-
-;; MASM syntax
-;; https://docs.microsoft.com/en-us/cpp/assembler/masm/microsoft-macro-assembler-reference?view=vs-2019
-
-public PushAllRegistersAndIterateStack
-
-.code
-PushAllRegistersAndIterateStack proc frame
-    ;; Push all callee-saved registers to get them on the stack for conservative
-    ;; stack scanning.
-    ;;
-    ;; We maintain 16-byte alignment at calls. There is an 8-byte return address
-    ;; on the stack and we push 232 bytes which maintains 16-byte stack
-    ;; alignment at the call.
-    ;; Source: https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention
-    ;;
-    ;; rbp is callee-saved. Maintain proper frame pointer for debugging.
-    push rbp
-    .pushreg rbp
-    mov rbp, rsp
-    .setframe rbp, 0
-    push 0CDCDCDh  ;; Dummy for alignment.
-    .allocstack 8
-    push rsi
-    .pushreg rsi
-    push rdi
-    .pushreg rdi
-    push rbx
-    .pushreg rbx
-    push r12
-    .pushreg r12
-    push r13
-    .pushreg r13
-    push r14
-    .pushreg r14
-    push r15
-    .pushreg r15
-    sub rsp, 160
-    .allocstack 160
-    .endprolog
-    ;; Use aligned instrs as we are certain that the stack is properly aligned.
-    movdqa  xmmword ptr [rsp + 144], xmm6
-    movdqa  xmmword ptr [rsp + 128], xmm7
-    movdqa  xmmword ptr [rsp + 112], xmm8
-    movdqa  xmmword ptr [rsp + 96], xmm9
-    movdqa  xmmword ptr [rsp + 80], xmm10
-    movdqa  xmmword ptr [rsp + 64], xmm11
-    movdqa  xmmword ptr [rsp + 48], xmm12
-    movdqa  xmmword ptr [rsp + 32], xmm13
-    movdqa  xmmword ptr [rsp + 16], xmm14
-    movdqa  xmmword ptr [rsp], xmm15
-    ;; Pass 1st parameter (rcx) unchanged (Stack*).
-    ;; Pass 2nd parameter (rdx) unchanged (StackVisitor*).
-    ;; Save 3rd parameter (r8; IterateStackCallback)
-    mov r9, r8
-    ;; Pass 3rd parameter as rsp (stack pointer).
-    mov r8, rsp
-    ;; Call the callback.
-    call r9
-    ;; Pop the callee-saved registers.
-    add rsp, 224
-    ;; Restore rbp as it was used as frame pointer.
-    pop rbp
-    ret
-    PushAllRegistersAndIterateStack endp
-
-end
+.text
+.globl PushAllRegistersAndIterateStack
+.seh_proc PushAllRegistersAndIterateStack
+PushAllRegistersAndIterateStack:
+  push %rbp
+  .seh_pushreg %rbp
+  mov %rsp, %rbp
+  .seh_setframe %rbp, 0
+  push $0xCDCDCD
+  .seh_stackalloc 8
+  push %rsi
+  .seh_pushreg %rsi
+  push %rdi
+  .seh_pushreg %rdi
+  push %rbx
+  .seh_pushreg %rbx
+  push %r12
+  .seh_pushreg %r12
+  push %r13
+  .seh_pushreg %r13
+  push %r14
+  .seh_pushreg %r14
+  push %r15
+  .seh_pushreg %r15
+  sub $160, %rsp
+  .seh_stackalloc 160
+  # Preserve Windows unwind metadata even though this is now GNU syntax.
+  # Without the .seh_* directives, SEH and stack walking can mis-handle
+  # unwinding across this callback frame.
+  .seh_endprologue
+  movdqa %xmm6, 144(%rsp)
+  movdqa %xmm7, 128(%rsp)
+  movdqa %xmm8, 112(%rsp)
+  movdqa %xmm9, 96(%rsp)
+  movdqa %xmm10, 80(%rsp)
+  movdqa %xmm11, 64(%rsp)
+  movdqa %xmm12, 48(%rsp)
+  movdqa %xmm13, 32(%rsp)
+  movdqa %xmm14, 16(%rsp)
+  movdqa %xmm15, 0(%rsp)
+  mov %r8, %r9
+  mov %rsp, %r8
+  call *%r9
+  add $224, %rsp
+  pop %rbp
+  ret
+.seh_endproc
diff --git a/orig/v8-15.0.245.2/src/libplatform/default-thread-isolated-allocator.cc b/mod/v8-15.0.245.2/src/libplatform/default-thread-isolated-allocator.cc
index bda0e43..b44f1d9 100644
--- a/orig/v8-15.0.245.2/src/libplatform/default-thread-isolated-allocator.cc
+++ b/mod/v8-15.0.245.2/src/libplatform/default-thread-isolated-allocator.cc
@@ -23,7 +23,7 @@ extern int pkey_free(int pkey) V8_WEAK;
 
 namespace {
 
-bool KernelHasPkruFix() {
+[[maybe_unused]] bool KernelHasPkruFix() {
   // PKU was broken on Linux kernels before 5.13 (see
   // https://lore.kernel.org/all/20210623121456.399107624@linutronix.de/).
   // A fix is also included in the 5.4.182 and 5.10.103 versions ("x86/fpu: