Release Cosmopolitan v3.8.0

This change switches c++ exception handling from sjlj to standard dwarf.
It's needed because clang for aarch64 doesn't support sjlj. It turns out
that libunwind had a bare-metal configuration that made this easy to do.

This change gets the new experimental cosmocc -mclang flag in a state of
working so well that it can now be used to build all of llamafile and it
goes 3x faster in terms of build latency, without trading away any perf.

The int_fast16_t and int_fast32_t types are now always defined as 32-bit
in the interest of having more abi consistency between cosmocc -mgcc and
-mclang mode.

Author: jart

.vscode/settings.json

@@ -1,5 +1,5 @@
 {
-    "C_Cpp.default.compilerPath": ".cosmocc/3.7.1/bin/aarch64-linux-cosmo-c++",
+    "C_Cpp.default.compilerPath": ".cosmocc/3.8.0/bin/aarch64-linux-cosmo-c++",
     "C_Cpp.default.compilerArgs": [
         "-nostdinc",
         "-nostdlib",
@@ -33,4 +33,4 @@
     "files.associations": {
         "log.h": "c"
     }
-}
+}

Makefile

@@ -147,10 +147,10 @@ export MODE
 export SOURCE_DATE_EPOCH
 export TMPDIR
 
-COSMOCC = .cosmocc/3.7.1
+COSMOCC = .cosmocc/3.8.0
 BOOTSTRAP = $(COSMOCC)/bin
 TOOLCHAIN = $(COSMOCC)/bin/$(ARCH)-linux-cosmo-
-DOWNLOAD := $(shell build/download-cosmocc.sh $(COSMOCC) 3.7.1 13b65b0e659b493bd82f3d0a319d0265d66f849839e484aa2a54191024711e85)
+DOWNLOAD := $(shell build/download-cosmocc.sh $(COSMOCC) 3.8.0 813c6b2f95062d2e0a845307a79505424cb98cb038e8013334f8a22e3b92a474)
 
 IGNORE := $(shell $(MKDIR) $(TMPDIR))
 

ape/aarch64.lds

@@ -103,10 +103,8 @@ SECTIONS {
     *(.eh_frame_entry .eh_frame_entry.*)
   }
 
-  .eh_frame : ONLY_IF_RO {
-    KEEP(*(.eh_frame))
-    *(.eh_frame.*)
-  }
+  __eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
+  __eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
 
   .gcc_except_table : ONLY_IF_RO {
     *(.gcc_except_table .gcc_except_table.*)
@@ -127,9 +125,11 @@ SECTIONS {
   . += CONSTANT(MAXPAGESIZE);
   . = DATA_SEGMENT_ALIGN(CONSTANT(MAXPAGESIZE), CONSTANT(COMMONPAGESIZE));
 
-  .eh_frame : ONLY_IF_RW {
+  .eh_frame : {
+    __eh_frame_start = .;
     KEEP(*(.eh_frame))
     *(.eh_frame.*)
+    __eh_frame_end = .;
   }
 
   .gnu_extab : ONLY_IF_RW {

ape/ape.lds

@@ -329,6 +329,10 @@ SECTIONS {
     *(.ubsan.types)
     *(.ubsan.data)
 
+    __eh_frame_hdr_start_actual = .;
+    *(.eh_frame_hdr)
+    __eh_frame_hdr_end_actual = .;
+
     /* Legal Notices */
     __notices = .;
     KEEP(*(.notice))
@@ -422,6 +426,11 @@ SECTIONS {
     KEEP(*(.dtors))
     __fini_array_end = .;
 
+    __eh_frame_start = .;
+    KEEP(*(.eh_frame))
+    *(.eh_frame.*)
+    __eh_frame_end = .;
+
 /*BEGIN: Post-Initialization Read-Only */
     . = ALIGN(. != 0 ? __SIZEOF_POINTER__ : 0);
     KEEP(*(SORT_BY_NAME(.piro.relo.sort.*)))
@@ -601,6 +610,9 @@ ape_text_memsz = ape_text_filesz;
 ape_text_align = CONSTANT(COMMONPAGESIZE);
 ape_text_rva = RVA(ape_text_vaddr);
 
+__eh_frame_hdr_start = __eh_frame_hdr_end_actual > __eh_frame_hdr_start_actual ? __eh_frame_hdr_start_actual : 0;
+__eh_frame_hdr_end = __eh_frame_hdr_end_actual > __eh_frame_hdr_start_actual ? __eh_frame_hdr_end_actual : 0;
+
 /* we roundup here because xnu wants the file load segments page-aligned */
 /* but we don't want to add the nop padding to the ape program, so we'll */
 /* let ape.S dd read past the end of the file into the wrapping binaries */

build/definitions.mk

@@ -92,10 +92,7 @@ DEFAULT_COPTS ?=							\
 	-fno-gnu-unique							\
 	-fstrict-aliasing						\
 	-fstrict-overflow						\
-	-fno-semantic-interposition					\
-	-fno-dwarf2-cfi-asm						\
-	-fno-unwind-tables						\
-	-fno-asynchronous-unwind-tables
+	-fno-semantic-interposition
 
 ifeq ($(ARCH), x86_64)
 # Microsoft says "[a]ny memory below the stack beyond the red zone
@@ -139,8 +136,6 @@ DEFAULT_CFLAGS =							\
 
 DEFAULT_CXXFLAGS =							\
 	-std=gnu++23							\
-	-fno-rtti							\
-	-fno-exceptions							\
 	-fuse-cxa-atexit						\
 	-Wno-int-in-bool-context					\
 	-Wno-narrowing							\

build/objdump

@@ -6,14 +6,14 @@ if [ -n "$OBJDUMP" ]; then
 fi
 
 find_objdump() {
-  if [ -x .cosmocc/3.6.0/bin/$1-linux-cosmo-objdump ]; then
-    OBJDUMP=.cosmocc/3.6.0/bin/$1-linux-cosmo-objdump
-  elif [ -x .cosmocc/3.6.0/bin/$1-linux-musl-objdump ]; then
-    OBJDUMP=.cosmocc/3.6.0/bin/$1-linux-musl-objdump
-  elif [ -x "$COSMO/.cosmocc/3.6.0/bin/$1-linux-cosmo-objdump" ]; then
-    OBJDUMP="$COSMO/.cosmocc/3.6.0/bin/$1-linux-cosmo-objdump"
-  elif [ -x "$COSMO/.cosmocc/3.6.0/bin/$1-linux-musl-objdump" ]; then
-    OBJDUMP="$COSMO/.cosmocc/3.6.0/bin/$1-linux-musl-objdump"
+  if [ -x .cosmocc/3.8.0/bin/$1-linux-cosmo-objdump ]; then
+    OBJDUMP=.cosmocc/3.8.0/bin/$1-linux-cosmo-objdump
+  elif [ -x .cosmocc/3.8.0/bin/$1-linux-musl-objdump ]; then
+    OBJDUMP=.cosmocc/3.8.0/bin/$1-linux-musl-objdump
+  elif [ -x "$COSMO/.cosmocc/3.8.0/bin/$1-linux-cosmo-objdump" ]; then
+    OBJDUMP="$COSMO/.cosmocc/3.8.0/bin/$1-linux-cosmo-objdump"
+  elif [ -x "$COSMO/.cosmocc/3.8.0/bin/$1-linux-musl-objdump" ]; then
+    OBJDUMP="$COSMO/.cosmocc/3.8.0/bin/$1-linux-musl-objdump"
   else
     echo "error: toolchain not found (try running 'cosmocc --update' or 'make' in the cosmo monorepo)" >&2
     exit 1

ctl/set.h

@@ -241,8 +241,9 @@ class set
       private:
         friend class set;
         node_type* node_;
+        node_type* root_;
 
-        explicit reverse_iterator(node_type* node) : node_(node)
+        explicit reverse_iterator(node_type* node, node_type* root) : node_(node), root_(root)
         {
         }
     };
@@ -347,17 +348,17 @@ class set
 
     reverse_iterator rbegin()
     {
-        return reverse_iterator(rightmost(root_));
+        return reverse_iterator(rightmost(root_), root_);
     }
 
     const_reverse_iterator rbegin() const
     {
-        return const_reverse_iterator(rightmost(root_));
+        return const_reverse_iterator(rightmost(root_), root_);
     }
 
     const_reverse_iterator crbegin() const
     {
-        return const_reverse_iterator(rightmost(root_));
+        return const_reverse_iterator(rightmost(root_), root_);
     }
 
     iterator end() noexcept
@@ -377,17 +378,17 @@ class set
 
     reverse_iterator rend()
     {
-        return reverse_iterator(nullptr);
+        return reverse_iterator(nullptr, root_);
     }
 
     const_reverse_iterator rend() const
     {
-        return const_reverse_iterator(nullptr);
+        return const_reverse_iterator(nullptr, root_);
     }
 
     const_reverse_iterator crend() const
     {
-        return const_reverse_iterator(nullptr);
+        return const_reverse_iterator(nullptr, root_);
     }
 
     void clear() noexcept

examples/BUILD.mk

@@ -94,6 +94,7 @@ EXAMPLES_DIRECTDEPS =						\
 	THIRD_PARTY_VQSORT					\
 	THIRD_PARTY_XED						\
 	THIRD_PARTY_LIBCXXABI					\
+	THIRD_PARTY_LIBUNWIND					\
 	THIRD_PARTY_ZLIB					\
 	TOOL_ARGS						\
 	TOOL_BUILD_LIB						\

libc/integral/normalize.inc

@@ -3,8 +3,8 @@
 #endif
 
 #define __COSMOPOLITAN_MAJOR__ 3
-#define __COSMOPOLITAN_MINOR__ 7
-#define __COSMOPOLITAN_PATCH__ 1
+#define __COSMOPOLITAN_MINOR__ 8
+#define __COSMOPOLITAN_PATCH__ 0
 #define __COSMOPOLITAN__                                                   \
   (100000000 * __COSMOPOLITAN_MAJOR__ + 1000000 * __COSMOPOLITAN_MINOR__ + \
    __COSMOPOLITAN_PATCH__)
@@ -93,6 +93,30 @@
 #include "libc/integral/llp64.inc"
 #endif
 
+#undef __INT_FAST16_MAX__
+#undef __INT_FAST16_TYPE__
+#undef __UINT_FAST16_MAX__
+#undef __INT_FAST16_WIDTH__
+#undef __UINT_FAST16_TYPE__
+
+#define __INT_FAST16_MAX__   2147483647
+#define __INT_FAST16_TYPE__  int
+#define __UINT_FAST16_MAX__  4294967295U
+#define __INT_FAST16_WIDTH__ 32
+#define __UINT_FAST16_TYPE__ unsigned int
+
+#undef __INT_FAST32_MAX__
+#undef __INT_FAST32_TYPE__
+#undef __UINT_FAST32_MAX__
+#undef __INT_FAST32_WIDTH__
+#undef __UINT_FAST32_TYPE__
+
+#define __INT_FAST32_MAX__   2147483647
+#define __INT_FAST32_TYPE__  int
+#define __UINT_FAST32_MAX__  4294967295U
+#define __INT_FAST32_WIDTH__ 32
+#define __UINT_FAST32_TYPE__ unsigned int
+
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 #ifdef __STDC__
 #include "libc/integral/c.inc"

libc/intrin/personality.c

@@ -0,0 +1,22 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2024 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+
+__attribute__((__weak__)) void __gxx_personality_v0() {
+  __builtin_trap();
+}