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Diffstat (limited to 'tools/llvm-rtdyld/llvm-rtdyld.cpp')
-rw-r--r-- | tools/llvm-rtdyld/llvm-rtdyld.cpp | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/tools/llvm-rtdyld/llvm-rtdyld.cpp b/tools/llvm-rtdyld/llvm-rtdyld.cpp new file mode 100644 index 0000000..ec9d652 --- /dev/null +++ b/tools/llvm-rtdyld/llvm-rtdyld.cpp @@ -0,0 +1,151 @@ +//===-- llvm-rtdyld.cpp - MCJIT Testing Tool ------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This is a testing tool for use with the MC-JIT LLVM components. +// +//===----------------------------------------------------------------------===// + +#include "llvm/ADT/StringMap.h" +#include "llvm/ADT/OwningPtr.h" +#include "llvm/ExecutionEngine/RuntimeDyld.h" +#include "llvm/Object/MachOObject.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ManagedStatic.h" +#include "llvm/Support/Memory.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Support/system_error.h" +using namespace llvm; +using namespace llvm::object; + +static cl::list<std::string> +InputFileList(cl::Positional, cl::ZeroOrMore, + cl::desc("<input file>")); + +enum ActionType { + AC_Execute +}; + +static cl::opt<ActionType> +Action(cl::desc("Action to perform:"), + cl::init(AC_Execute), + cl::values(clEnumValN(AC_Execute, "execute", + "Load, link, and execute the inputs."), + clEnumValEnd)); + +static cl::opt<std::string> +EntryPoint("entry", + cl::desc("Function to call as entry point."), + cl::init("_main")); + +/* *** */ + +// A trivial memory manager that doesn't do anything fancy, just uses the +// support library allocation routines directly. +class TrivialMemoryManager : public RTDyldMemoryManager { +public: + SmallVector<sys::MemoryBlock, 16> FunctionMemory; + + uint8_t *startFunctionBody(const char *Name, uintptr_t &Size); + void endFunctionBody(const char *Name, uint8_t *FunctionStart, + uint8_t *FunctionEnd); +}; + +uint8_t *TrivialMemoryManager::startFunctionBody(const char *Name, + uintptr_t &Size) { + return (uint8_t*)sys::Memory::AllocateRWX(Size, 0, 0).base(); +} + +void TrivialMemoryManager::endFunctionBody(const char *Name, + uint8_t *FunctionStart, + uint8_t *FunctionEnd) { + uintptr_t Size = FunctionEnd - FunctionStart + 1; + FunctionMemory.push_back(sys::MemoryBlock(FunctionStart, Size)); +} + +static const char *ProgramName; + +static void Message(const char *Type, const Twine &Msg) { + errs() << ProgramName << ": " << Type << ": " << Msg << "\n"; +} + +static int Error(const Twine &Msg) { + Message("error", Msg); + return 1; +} + +/* *** */ + +static int executeInput() { + // Instantiate a dynamic linker. + TrivialMemoryManager *MemMgr = new TrivialMemoryManager; + RuntimeDyld Dyld(MemMgr); + + // 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) + return Error("no definition for '" + EntryPoint + "'"); + + // Invalidate the instruction cache for each loaded function. + for (unsigned i = 0, e = MemMgr->FunctionMemory.size(); i != e; ++i) { + sys::MemoryBlock &Data = MemMgr->FunctionMemory[i]; + // Make sure the memory is executable. + std::string ErrorStr; + sys::Memory::InvalidateInstructionCache(Data.base(), Data.size()); + if (!sys::Memory::setExecutable(Data, &ErrorStr)) + return Error("unable to mark function executable: '" + ErrorStr + "'"); + } + + // Dispatch to _main(). + 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]; + // 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); +} + +int main(int argc, char **argv) { + ProgramName = argv[0]; + llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. + + cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n"); + + switch (Action) { + default: + case AC_Execute: + return executeInput(); + } + + return 0; +} |