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 $TEMP_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        $TEMP_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 $TEMP_DIR/libfoo-present.dylib -Os
   8 // BUILD:  $CC runner.c          -o $BUILD_DIR/lazy-symbol-runner.exe -DRUN_DIR="$RUN_DIR"
   9
  10 // NO_CRASH_LOG: lazy-symbol-missing-called.exe
  11
  12 // RUN:  ./lazy-symbol-missing.exe
  13 // RUN:  ./lazy-symbol-runner.exe
  14 // RUN:  ./lazy-symbol-missing-flat.exe
  15
  16
  17 #include <stdio.h>
  18 #include <stdbool.h>
  19 #include <mach-o/getsect.h>
  20
  21 #if __LP64__
  22 extern struct mach_header_64 __dso_handle;
  23 #else
  24 extern struct mach_header __dso_handle;
  25 #endif
  26
  27 extern int slipperySymbol();
  28
  29 #ifdef FLAT
  30   #define TESTNAME "lazy-symbol-missing-flat"
  31 #else
  32   #define TESTNAME "lazy-symbol-missing"
  33 #endif
  34
  35 int main(int argc, const char* argv[])
  36 {
  37     printf("[BEGIN] " TESTNAME "\n");
  38
  39 #if __arm64e__
  40     // arm64e always uses chained binds which does not support lazy binding
  41     bool supportsLazyBinding = false;
  42 #else
  43     // other architectures may or may not use lazy binding
  44     unsigned long sectSize = 0;
  45     bool supportsLazyBinding = (getsectiondata(&__dso_handle, "__DATA", "__la_symbol_ptr", &sectSize) != NULL);
  46   #if __ARM_ARCH_7K__
  47     // armv7 has two names for lazy pointers section
  48     if ( !supportsLazyBinding )
  49         supportsLazyBinding = (getsectiondata(&__dso_handle, "__DATA", "__lazy_symbol", &sectSize) != NULL);
  50   #endif
  51 #endif
  52
  53     if ( supportsLazyBinding ) {
  54         // add runtime check that results in the function never being called
  55         if ( argc < 0 )
  56             slipperySymbol();
  57     }
  58
  59     printf("[PASS]  " TESTNAME "\n");
  60
  61         return 0;
  62 }
  63