//===-- Intercept.cpp - System function interception routines -------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// If a function call occurs to an external function, the JIT is designed to use
#include "JIT.h"
#include "llvm/System/DynamicLibrary.h"
-#include <iostream>
-#include <sys/stat.h>
+#include "llvm/Config/config.h"
using namespace llvm;
// AtExitHandlers - List of functions to call when the program exits,
// strategy of making these functions work differently when inlined vs. when
// not inlined, and hiding their real definitions in a separate archive file
// that the dynamic linker can't see. For more info, search for
-// 'libc_nonshared.a' on Google, or read http://llvm.cs.uiuc.edu/PR274.
+// 'libc_nonshared.a' on Google, or read http://llvm.org/PR274.
#if defined(__linux__)
+#if defined(HAVE_SYS_STAT_H)
+#include <sys/stat.h>
+#endif
void *FunctionPointers[] = {
- (void *) stat,
- (void *) fstat,
- (void *) lstat,
- (void *) stat64,
- (void *) fstat64,
- (void *) lstat64,
- (void *) atexit,
- (void *) mknod
+ (void *)(intptr_t) stat,
+ (void *)(intptr_t) fstat,
+ (void *)(intptr_t) lstat,
+ (void *)(intptr_t) stat64,
+ (void *)(intptr_t) fstat64,
+ (void *)(intptr_t) lstat64,
+ (void *)(intptr_t) atexit,
+ (void *)(intptr_t) mknod
};
#endif // __linux__
}
//===----------------------------------------------------------------------===//
-//
+//
/// getPointerToNamedFunction - This method returns the address of the specified
-/// function by using the dynamic loader interface. As such it is only useful
+/// function by using the dynamic loader interface. As such it is only useful
/// for resolving library symbols, not code generated symbols.
///
void *JIT::getPointerToNamedFunction(const std::string &Name) {
- // Check to see if this is one of the functions we want to intercept...
- if (Name == "exit") return (void*)&jit_exit;
- if (Name == "atexit") return (void*)&jit_atexit;
+ // Check to see if this is one of the functions we want to intercept. Note,
+ // we cast to intptr_t here to silence a -pedantic warning that complains
+ // about casting a function pointer to a normal pointer.
+ if (Name == "exit") return (void*)(intptr_t)&jit_exit;
+ if (Name == "atexit") return (void*)(intptr_t)&jit_atexit;
// If the program does not have a linked in __main function, allow it to run,
// but print a warning.
- if (Name == "__main") return (void*)&__mainFunc;
+ if (Name == "__main") return (void*)(intptr_t)&__mainFunc;
+ const char *NameStr = Name.c_str();
+ // If this is an asm specifier, skip the sentinal.
+ if (NameStr[0] == 1) ++NameStr;
+
// If it's an external function, look it up in the process image...
- void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(Name);
+ void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
if (Ptr) return Ptr;
+
+ // If it wasn't found and if it starts with an underscore ('_') character, and
+ // has an asm specifier, try again without the underscore.
+ if (Name[0] == 1 && NameStr[0] == '_') {
+ Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
+ if (Ptr) return Ptr;
+ }
- std::cerr << "ERROR: Program used external function '" << Name
- << "' which could not be resolved!\n";
+ cerr << "ERROR: Program used external function '" << Name
+ << "' which could not be resolved!\n";
abort();
return 0;
}