testing/test-cases/lazy-symbol-missing.dtest/main.c

   1 // note: -Os is needed for armv7 to work around compiler issue where at -O0 it computes pointer to function and calls that
   2
   3 // BUILD:  $CC foo.c -dynamiclib -o $BUILD_DIR/libfoo.dylib         -install_name $RUN_DIR/libfoo.dylib
   4 // BUILD:  $CC foo.c -dynamiclib -o $BUILD_DIR/libfoo-present.dylib  -install_name $RUN_DIR/libfoo.dylib -DHAS_SYMBOL=1
   5 // BUILD:  $CC main.c            -o $BUILD_DIR/lazy-symbol-missing.exe        $BUILD_DIR/libfoo-present.dylib -Os
   6 // BUILD:  $CC main.c            -o $BUILD_DIR/lazy-symbol-missing-flat.exe   -undefined dynamic_lookup      -Os -DFLAT=1
   7 // BUILD:  $CC main-call.c       -o $BUILD_DIR/lazy-symbol-missing-called.exe $BUILD_DIR/libfoo-present.dylib -Os
   8 // BUILD:  $CXX runner.cpp         -o $BUILD_DIR/lazy-symbol-runner.exe -DRUN_DIR="$RUN_DIR"
   9
  10 // BUILD: $SKIP_INSTALL $BUILD_DIR/libfoo-present.dylib
  11
  12 // NO_CRASH_LOG: lazy-symbol-missing-called.exe
  13
  14 // RUN:  ./lazy-symbol-missing.exe
  15 // RUN:  ./lazy-symbol-runner.exe
  16 // RUN:  ./lazy-symbol-missing-flat.exe
  17
  18
  19 #include <stdio.h>
  20 #include <stdbool.h>
  21 #include <mach-o/getsect.h>
  22
  23 #include "test_support.h"
  24
  25 #if __LP64__
  26 extern struct mach_header_64 __dso_handle;
  27 #else
  28 extern struct mach_header __dso_handle;
  29 #endif
  30
  31 extern int slipperySymbol();
  32
  33 #ifdef FLAT
  34   #define TESTNAME "lazy-symbol-missing-flat"
  35 #else
  36   #define TESTNAME "lazy-symbol-missing"
  37 #endif
  38
  39 int main(int argc, const char* argv[], const char* envp[], const char* apple[]) {
  40 #if __arm64e__
  41     // arm64e always uses chained binds which does not support lazy binding
  42     bool supportsLazyBinding = false;
  43 #else
  44     // other architectures may or may not use lazy binding
  45     unsigned long sectSize = 0;
  46     bool supportsLazyBinding = (getsectiondata(&__dso_handle, "__DATA", "__la_symbol_ptr", &sectSize) != NULL);
  47   #if __ARM_ARCH_7K__
  48     // armv7 has two names for lazy pointers section
  49     if ( !supportsLazyBinding )
  50         supportsLazyBinding = (getsectiondata(&__dso_handle, "__DATA", "__lazy_symbol", &sectSize) != NULL);
  51   #endif
  52 #endif
  53
  54     if ( supportsLazyBinding ) {
  55         // add runtime check that results in the function never being called
  56         if ( argc < 0 )
  57             slipperySymbol();
  58     }
  59     PASS("%s", TESTNAME);
  60 }
  61