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[tools][llvm-rtdyld] Add a '-dylib <file>' option to llvm-rtdyld to load shared

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libraries before linking and executing the target objects.

This allows programs that use external calls (e.g. to libc) to be run under
llvm-rtdyld.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2014-05-13 22:37:41 +00:00
parent 9c29061391
commit f057625676
1 changed files with 25 additions and 0 deletions
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25
tools/llvm-rtdyld/llvm-rtdyld.cpp
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@ -18,6 +18,7 @@
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/MemoryBuffer.h"
@ -51,6 +52,11 @@ EntryPoint("entry",
cl::desc("Function to call as entry point."),
cl::init("_main"));
static cl::list<std::string>
Dylibs("dylib",
cl::desc("Add library."),
cl::ZeroOrMore);
/* *** */
// A trivial memory manager that doesn't do anything fancy, just uses the
@ -121,9 +127,25 @@ static int Error(const Twine &Msg) {
return 1;
}
static void loadDylibs() {
for (const std::string &Dylib : Dylibs) {
if (sys::fs::is_regular_file(Dylib)) {
std::string ErrMsg;
if (sys::DynamicLibrary::LoadLibraryPermanently(Dylib.c_str(), &ErrMsg))
llvm::errs() << "Error loading '" << Dylib << "': "
<< ErrMsg << "\n";
} else
llvm::errs() << "Dylib not found: '" << Dylib << "'.\n";
}
}
/* *** */
static int printLineInfoForInput() {
// Load any dylibs requested on the command line.
loadDylibs();
// If we don't have any input files, read from stdin.
if (!InputFileList.size())
InputFileList.push_back("-");
@ -182,6 +204,9 @@ static int printLineInfoForInput() {
}
static int executeInput() {
// Load any dylibs requested on the command line.
loadDylibs();
// Instantiate a dynamic linker.
TrivialMemoryManager MemMgr;
RuntimeDyld Dyld(&MemMgr);