Update compiler-rt to LLVM 19.1.4 (emscripten-core#22937)

All changes are upstream changes except for a few unused variable
warning fixes and code size rebaselines.

This PR was created by running
https://github.com/emscripten-core/emscripten/blob/main/system/lib/update_compiler_rt.py
script.

ChangeLog.md

@@ -20,6 +20,7 @@ See docs/process.md for more on how version tagging works.
 
 3.1.75 (in development)
 -----------------------
+- compiler-rt was updated to LLVM 19.1.4. (#22937)
 - The Wasm nontrapping-fptoint feature has been enabled by default. clang will
   generate nontrapping (saturating) float-to-int conversion instructions for
   C typecasts. This should have no effect on programs that do not have

system/lib/compiler-rt/include/sanitizer/allocator_interface.h

@@ -62,13 +62,20 @@ size_t SANITIZER_CDECL __sanitizer_get_free_bytes(void);
 size_t SANITIZER_CDECL __sanitizer_get_unmapped_bytes(void);
 
 /* Malloc hooks that may be optionally provided by user.
-   __sanitizer_malloc_hook(ptr, size) is called immediately after
-     allocation of "size" bytes, which returned "ptr".
-   __sanitizer_free_hook(ptr) is called immediately before
-     deallocation of "ptr". */
+   - __sanitizer_malloc_hook(ptr, size) is called immediately after allocation
+     of "size" bytes, which returned "ptr".
+   - __sanitizer_free_hook(ptr) is called immediately before deallocation of
+     "ptr".
+   - __sanitizer_ignore_free_hook(ptr) is called immediately before deallocation
+     of "ptr", and if it returns a non-zero value, the deallocation of "ptr"
+     will not take place. This allows software to make free a no-op until it
+     calls free() again in the same pointer at a later time. Hint: read this as
+     "ignore the free" rather than "ignore the hook".
+*/
 void SANITIZER_CDECL __sanitizer_malloc_hook(const volatile void *ptr,
                                              size_t size);
 void SANITIZER_CDECL __sanitizer_free_hook(const volatile void *ptr);
+int SANITIZER_CDECL __sanitizer_ignore_free_hook(const volatile void *ptr);
 
 /* Installs a pair of hooks for malloc/free.
    Several (currently, 5) hook pairs may be installed, they are executed

system/lib/compiler-rt/include/sanitizer/linux_syscall_hooks.h

@@ -1856,6 +1856,15 @@
   __sanitizer_syscall_pre_impl_sigaltstack((long)ss, (long)oss)
 #define __sanitizer_syscall_post_sigaltstack(res, ss, oss)                     \
   __sanitizer_syscall_post_impl_sigaltstack(res, (long)ss, (long)oss)
+#define __sanitizer_syscall_pre_futex(uaddr, futex_op, val, timeout, uaddr2,   \
+                                      val3)                                    \
+  __sanitizer_syscall_pre_impl_futex((long)uaddr, (long)futex_op, (long)val,   \
+                                     (long)timeout, (long)uaddr2, (long)val3)
+#define __sanitizer_syscall_post_futex(res, uaddr, futex_op, val, timeout,     \
+                                       uaddr2, val3)                           \
+  __sanitizer_syscall_post_impl_futex(res, (long)uaddr, (long)futex_op,        \
+                                      (long)val, (long)timeout, (long)uaddr2,  \
+                                      (long)val3)
 
 // And now a few syscalls we don't handle yet.
 #define __sanitizer_syscall_pre_afs_syscall(...)
@@ -1875,7 +1884,6 @@
 #define __sanitizer_syscall_pre_fchown32(...)
 #define __sanitizer_syscall_pre_ftime(...)
 #define __sanitizer_syscall_pre_ftruncate64(...)
-#define __sanitizer_syscall_pre_futex(...)
 #define __sanitizer_syscall_pre_getegid32(...)
 #define __sanitizer_syscall_pre_geteuid32(...)
 #define __sanitizer_syscall_pre_getgid32(...)
@@ -1954,7 +1962,6 @@
 #define __sanitizer_syscall_post_fchown32(res, ...)
 #define __sanitizer_syscall_post_ftime(res, ...)
 #define __sanitizer_syscall_post_ftruncate64(res, ...)
-#define __sanitizer_syscall_post_futex(res, ...)
 #define __sanitizer_syscall_post_getegid32(res, ...)
 #define __sanitizer_syscall_post_geteuid32(res, ...)
 #define __sanitizer_syscall_post_getgid32(res, ...)
@@ -3093,6 +3100,11 @@ void __sanitizer_syscall_post_impl_rt_sigaction(long res, long signum, long act,
                                                 long oldact, long sz);
 void __sanitizer_syscall_pre_impl_sigaltstack(long ss, long oss);
 void __sanitizer_syscall_post_impl_sigaltstack(long res, long ss, long oss);
+void __sanitizer_syscall_pre_impl_futex(long uaddr, long futex_op, long val,
+                                        long timeout, long uaddr2, long val3);
+void __sanitizer_syscall_post_impl_futex(long res, long uaddr, long futex_op,
+                                         long val, long timeout, long uaddr2,
+                                         long val3);
 #ifdef __cplusplus
 } // extern "C"
 #endif

system/lib/compiler-rt/include/sanitizer/nsan_interface.h

@@ -0,0 +1,75 @@
+//===-- sanitizer/nsan_interface.h ------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Public interface for nsan.
+//
+//===----------------------------------------------------------------------===//
+#ifndef SANITIZER_NSAN_INTERFACE_H
+#define SANITIZER_NSAN_INTERFACE_H
+
+#include <sanitizer/common_interface_defs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/// User-provided default option settings.
+///
+/// You can provide your own implementation of this function to return a string
+/// containing NSan runtime options (for example,
+/// <c>verbosity=1:halt_on_error=0</c>).
+///
+/// \returns Default options string.
+const char *__nsan_default_options(void);
+
+// Dumps nsan shadow data for a block of `size_bytes` bytes of application
+// memory at location `addr`.
+//
+// Each line contains application address, shadow types, then values.
+// Unknown types are shown as `__`, while known values are shown as
+// `f`, `d`, `l` for float, double, and long double respectively. Position is
+// shown as a single hex digit. The shadow value itself appears on the line that
+// contains the first byte of the value.
+// FIXME: Show both shadow and application value.
+//
+// Example: `__nsan_dump_shadow_mem(addr, 32, 8, 0)` might print:
+//
+//  0x0add7359:  __ f0 f1 f2 f3 __ __ __   (42.000)
+//  0x0add7361:  __ d1 d2 d3 d4 d5 d6 d7
+//  0x0add7369:  d8 f0 f1 f2 f3 __ __ f2   (-1.000) (12.5)
+//  0x0add7371:  f3 __ __ __ __ __ __ __
+//
+// This means that there is:
+//   - a shadow double for the float at address 0x0add7360, with value 42;
+//   - a shadow float128 for the double at address 0x0add7362, with value -1;
+//   - a shadow double for the float at address 0x0add736a, with value 12.5;
+// There was also a shadow double for the float at address 0x0add736e, but bytes
+// f0 and f1 were overwritten by one or several stores, so that the shadow value
+// is no longer valid.
+// The argument `reserved` can be any value. Its true value is provided by the
+// instrumentation.
+void __nsan_dump_shadow_mem(const char *addr, size_t size_bytes,
+                            size_t bytes_per_line, size_t reserved);
+
+// Explicitly dumps a value.
+// FIXME: vector versions ?
+void __nsan_dump_float(float value);
+void __nsan_dump_double(double value);
+void __nsan_dump_longdouble(long double value);
+
+// Explicitly checks a value.
+// FIXME: vector versions ?
+void __nsan_check_float(float value);
+void __nsan_check_double(double value);
+void __nsan_check_longdouble(long double value);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // SANITIZER_NSAN_INTERFACE_H

system/lib/compiler-rt/lib/asan/asan_allocator.cpp

@@ -717,7 +717,15 @@ struct Allocator {
       return;
     }
 
-    RunFreeHooks(ptr);
+    if (RunFreeHooks(ptr)) {
+      // Someone used __sanitizer_ignore_free_hook() and decided that they
+      // didn't want the memory to __sanitizer_ignore_free_hook freed right now.
+      // When they call free() on this pointer again at a later time, we should
+      // ignore the alloc-type mismatch and allow them to deallocate the pointer
+      // through free(), rather than the initial alloc type.
+      m->alloc_type = FROM_MALLOC;
+      return;
+    }
 
     // Must mark the chunk as quarantined before any changes to its metadata.
     // Do not quarantine given chunk if we failed to set CHUNK_QUARANTINE flag.

system/lib/compiler-rt/lib/asan/asan_descriptions.cpp

@@ -245,11 +245,11 @@ static void PrintAccessAndVarIntersection(const StackVarDescr &var, uptr addr,
   InternalScopedString str;
   str.AppendF("    [%zd, %zd)", var.beg, var_end);
   // Render variable name.
-  str.AppendF(" '");
+  str.Append(" '");
   for (uptr i = 0; i < var.name_len; ++i) {
     str.AppendF("%c", var.name_pos[i]);
   }
-  str.AppendF("'");
+  str.Append("'");
   if (var.line > 0) {
     str.AppendF(" (line %zd)", var.line);
   }
@@ -260,7 +260,7 @@ static void PrintAccessAndVarIntersection(const StackVarDescr &var, uptr addr,
     str.AppendF("%s <== Memory access at offset %zd %s this variable%s\n",
                 d.Location(), addr, pos_descr, d.Default());
   } else {
-    str.AppendF("\n");
+    str.Append("\n");
   }
   Printf("%s", str.data());
 }
@@ -292,7 +292,7 @@ static void DescribeAddressRelativeToGlobal(uptr addr, uptr access_size,
   str.AppendF(" global variable '%s' defined in '",
               MaybeDemangleGlobalName(g.name));
   PrintGlobalLocation(&str, g, /*print_module_name=*/false);
-  str.AppendF("' (0x%zx) of size %zu\n", g.beg, g.size);
+  str.AppendF("' (%p) of size %zu\n", (void *)g.beg, g.size);
   str.Append(d.Default());
   PrintGlobalNameIfASCII(&str, g);
   Printf("%s", str.data());

system/lib/compiler-rt/lib/asan/asan_fuchsia.cpp

@@ -57,8 +57,6 @@ void AsanCheckDynamicRTPrereqs() {}
 void AsanCheckIncompatibleRT() {}
 void InitializeAsanInterceptors() {}
 
-void *AsanDoesNotSupportStaticLinkage() { return nullptr; }
-
 void InitializePlatformExceptionHandlers() {}
 void AsanOnDeadlySignal(int signo, void *siginfo, void *context) {
   UNIMPLEMENTED();

system/lib/compiler-rt/lib/asan/asan_globals.cpp

@@ -345,8 +345,8 @@ void __asan_unregister_image_globals(uptr *flag) {
 }
 
 void __asan_register_elf_globals(uptr *flag, void *start, void *stop) {
-  if (*flag) return;
-  if (!start) return;
+  if (*flag || start == stop)
+    return;
   CHECK_EQ(0, ((uptr)stop - (uptr)start) % sizeof(__asan_global));
   __asan_global *globals_start = (__asan_global*)start;
   __asan_global *globals_stop = (__asan_global*)stop;
@@ -355,8 +355,8 @@ void __asan_register_elf_globals(uptr *flag, void *start, void *stop) {
 }
 
 void __asan_unregister_elf_globals(uptr *flag, void *start, void *stop) {
-  if (!*flag) return;
-  if (!start) return;
+  if (!*flag || start == stop)
+    return;
   CHECK_EQ(0, ((uptr)stop - (uptr)start) % sizeof(__asan_global));
   __asan_global *globals_start = (__asan_global*)start;
   __asan_global *globals_stop = (__asan_global*)stop;

system/lib/compiler-rt/lib/asan/asan_globals_win.cpp

@@ -17,10 +17,10 @@ namespace __asan {
 
 #pragma section(".ASAN$GA", read, write)
 #pragma section(".ASAN$GZ", read, write)
-extern "C" __declspec(allocate(".ASAN$GA"))
-    ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_start = {};
-extern "C" __declspec(allocate(".ASAN$GZ"))
-    ALIGNED(sizeof(__asan_global)) __asan_global __asan_globals_end = {};
+extern "C" alignas(sizeof(__asan_global))
+    __declspec(allocate(".ASAN$GA")) __asan_global __asan_globals_start = {};
+extern "C" alignas(sizeof(__asan_global))
+    __declspec(allocate(".ASAN$GZ")) __asan_global __asan_globals_end = {};
 #pragma comment(linker, "/merge:.ASAN=.data")
 
 static void call_on_globals(void (*hook)(__asan_global *, uptr)) {

system/lib/compiler-rt/lib/asan/asan_interceptors.cpp

@@ -333,7 +333,7 @@ INTERCEPTOR(int, pthread_timedjoin_np, void *thread, void **ret,
 }
 #    endif
 
-DEFINE_REAL_PTHREAD_FUNCTIONS
+DEFINE_INTERNAL_PTHREAD_FUNCTIONS
 #endif  // ASAN_INTERCEPT_PTHREAD_CREATE
 
 #if ASAN_INTERCEPT_SWAPCONTEXT
@@ -352,8 +352,16 @@ static void ClearShadowMemoryForContextStack(uptr stack, uptr ssize) {
   PoisonShadow(bottom, ssize, 0);
 }
 
+// Since Solaris 10/SPARC, ucp->uc_stack.ss_sp refers to the stack base address
+// as on other targets.  For binary compatibility, the new version uses a
+// different external name, so we intercept that.
+#    if SANITIZER_SOLARIS && defined(__sparc__)
+INTERCEPTOR(void, __makecontext_v2, struct ucontext_t *ucp, void (*func)(),
+            int argc, ...) {
+#    else
 INTERCEPTOR(void, makecontext, struct ucontext_t *ucp, void (*func)(), int argc,
             ...) {
+#    endif
   va_list ap;
   uptr args[64];
   // We don't know a better way to forward ... into REAL function. We can
@@ -373,7 +381,11 @@ INTERCEPTOR(void, makecontext, struct ucontext_t *ucp, void (*func)(), int argc,
       ENUMERATE_ARRAY_16(0), ENUMERATE_ARRAY_16(16), ENUMERATE_ARRAY_16(32), \
           ENUMERATE_ARRAY_16(48)
 
+#    if SANITIZER_SOLARIS && defined(__sparc__)
+  REAL(__makecontext_v2)
+#    else
   REAL(makecontext)
+#    endif
   ((struct ucontext_t *)ucp, func, argc, ENUMERATE_ARRAY_64());
 
 #    undef ENUMERATE_ARRAY_4
@@ -558,6 +570,17 @@ INTERCEPTOR(char *, strcpy, char *to, const char *from) {
   return REAL(strcpy)(to, from);
 }
 
+// Windows doesn't always define the strdup identifier,
+// and when it does it's a macro defined to either _strdup
+// or _strdup_dbg, _strdup_dbg ends up calling _strdup, so
+// we want to intercept that. push/pop_macro are used to avoid problems
+// if this file ends up including <string.h> in the future.
+#  if SANITIZER_WINDOWS
+#    pragma push_macro("strdup")
+#    undef strdup
+#    define strdup _strdup
+#  endif
+
 INTERCEPTOR(char*, strdup, const char *s) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strdup);
@@ -575,7 +598,7 @@ INTERCEPTOR(char*, strdup, const char *s) {
   return reinterpret_cast<char*>(new_mem);
 }
 
-#if ASAN_INTERCEPT___STRDUP
+#  if ASAN_INTERCEPT___STRDUP
 INTERCEPTOR(char*, __strdup, const char *s) {
   void *ctx;
   ASAN_INTERCEPTOR_ENTER(ctx, strdup);
@@ -724,7 +747,7 @@ INTERCEPTOR(int, atexit, void (*func)()) {
 extern "C" {
 extern int _pthread_atfork(void (*prepare)(), void (*parent)(),
                            void (*child)());
-};
+}
 
 INTERCEPTOR(int, pthread_atfork, void (*prepare)(), void (*parent)(),
             void (*child)()) {
@@ -738,8 +761,8 @@ INTERCEPTOR(int, pthread_atfork, void (*prepare)(), void (*parent)(),
 #endif
 
 #if ASAN_INTERCEPT_VFORK
-DEFINE_REAL(int, vfork)
-DECLARE_EXTERN_INTERCEPTOR_AND_WRAPPER(int, vfork)
+DEFINE_REAL(int, vfork,)
+DECLARE_EXTERN_INTERCEPTOR_AND_WRAPPER(int, vfork,)
 #endif
 
 // ---------------------- InitializeAsanInterceptors ---------------- {{{1
@@ -758,7 +781,7 @@ void InitializeAsanInterceptors() {
   ASAN_INTERCEPT_FUNC(strncat);
   ASAN_INTERCEPT_FUNC(strncpy);
   ASAN_INTERCEPT_FUNC(strdup);
-#if ASAN_INTERCEPT___STRDUP
+#  if ASAN_INTERCEPT___STRDUP
   ASAN_INTERCEPT_FUNC(__strdup);
 #endif
 #if ASAN_INTERCEPT_INDEX && ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX
@@ -780,7 +803,12 @@ void InitializeAsanInterceptors() {
 
 #  if ASAN_INTERCEPT_SWAPCONTEXT
   ASAN_INTERCEPT_FUNC(swapcontext);
+  // See the makecontext interceptor above for an explanation.
+#    if SANITIZER_SOLARIS && defined(__sparc__)
+  ASAN_INTERCEPT_FUNC(__makecontext_v2);
+#    else
   ASAN_INTERCEPT_FUNC(makecontext);
+#    endif
 #  endif
 #  if ASAN_INTERCEPT__LONGJMP
   ASAN_INTERCEPT_FUNC(_longjmp);
@@ -849,6 +877,10 @@ void InitializeAsanInterceptors() {
   VReport(1, "AddressSanitizer: libc interceptors initialized\n");
 }
 
+#  if SANITIZER_WINDOWS
+#    pragma pop_macro("strdup")
+#  endif
+
 } // namespace __asan
 
 #endif  // !SANITIZER_FUCHSIA && !SANITIZER_RTEMS && !SANITIZER_EMSCRIPTEN

system/lib/compiler-rt/lib/asan/asan_internal.h

@@ -80,7 +80,6 @@ void ReplaceSystemMalloc();
 
 // asan_linux.cpp / asan_mac.cpp / asan_win.cpp
 uptr FindDynamicShadowStart();
-void *AsanDoesNotSupportStaticLinkage();
 void AsanCheckDynamicRTPrereqs();
 void AsanCheckIncompatibleRT();