[llvm-commits] [llvm] r129448 - /llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp
Jim Grosbach
grosbach at apple.com
Wed Apr 13 08:49:40 PDT 2011
Author: grosbach
Date: Wed Apr 13 10:49:40 2011
New Revision: 129448
URL: http://llvm.org/viewvc/llvm-project?rev=129448&view=rev
Log:
Load multiple object files and link them via RuntimeDyld in llvm-rtdyld.
Relocations between the object modules are properly resolved, as in the
following trivial example:
$ cat t.c
int foo();
int main() {
return foo();
}
$ cat foo.c
int foo() {
return 65;
}
$ clang -c t.c -fno-asynchronous-unwind-tables
$ clang -c foo.c -fno-asynchronous-unwind-tables
$ llvm-rtdyld t.o foo.o ; echo $?
loaded '_main' at: 0x10015c000
65
Modified:
llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp
Modified: llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp?rev=129448&r1=129447&r2=129448&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp (original)
+++ llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp Wed Apr 13 10:49:40 2011
@@ -24,8 +24,9 @@
using namespace llvm;
using namespace llvm::object;
-static cl::opt<std::string>
-InputFile(cl::Positional, cl::desc("<input file>"), cl::init("-"));
+static cl::list<std::string>
+InputFileList(cl::Positional, cl::ZeroOrMore,
+ cl::desc("<input file>"));
enum ActionType {
AC_Execute
@@ -82,22 +83,31 @@
/* *** */
static int executeInput() {
- // Load the input memory buffer.
- OwningPtr<MemoryBuffer> InputBuffer;
- if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFile, InputBuffer))
- return Error("unable to read input: '" + ec.message() + "'");
-
// Instantiate a dynamic linker.
TrivialMemoryManager *MemMgr = new TrivialMemoryManager;
RuntimeDyld Dyld(MemMgr);
- // Load the object file into it.
- if (Dyld.loadObject(InputBuffer.take())) {
- return Error(Dyld.getErrorString());
+ // If we don't have any input files, read from stdin.
+ if (!InputFileList.size())
+ InputFileList.push_back("-");
+ for(unsigned i = 0, e = InputFileList.size(); i != e; ++i) {
+ // Load the input memory buffer.
+ OwningPtr<MemoryBuffer> InputBuffer;
+ if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFileList[i],
+ InputBuffer))
+ return Error("unable to read input: '" + ec.message() + "'");
+
+ // Load the object file into it.
+ if (Dyld.loadObject(InputBuffer.take())) {
+ return Error(Dyld.getErrorString());
+ }
}
+
// Resolve all the relocations we can.
Dyld.resolveRelocations();
+ // FIXME: Error out if there are unresolved relocations.
+
// Get the address of the entry point (_main by default).
void *MainAddress = Dyld.getSymbolAddress(EntryPoint);
if (MainAddress == 0)
@@ -113,14 +123,14 @@
return Error("unable to mark function executable: '" + ErrorStr + "'");
}
-
// Dispatch to _main().
- errs() << "loaded '_main' at: " << (void*)MainAddress << "\n";
+ errs() << "loaded '" << EntryPoint << "' at: " << (void*)MainAddress << "\n";
int (*Main)(int, const char**) =
(int(*)(int,const char**)) uintptr_t(MainAddress);
const char **Argv = new const char*[2];
- Argv[0] = InputFile.c_str();
+ // Use the name of the first input object module as argv[0] for the target.
+ Argv[0] = InputFileList[0].c_str();
Argv[1] = 0;
return Main(1, Argv);
}
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