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It's more flexible for MCJIT tasks, in addition it's provides a invalidation instruction cache for code sections which will be used before JIT code will be executed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156933 91177308-0d34-0410-b5e6-96231b3b80d8
178 lines
6.0 KiB
C++
178 lines
6.0 KiB
C++
//===-- llvm-rtdyld.cpp - MCJIT Testing Tool ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is a testing tool for use with the MC-JIT LLVM components.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ExecutionEngine/RuntimeDyld.h"
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#include "llvm/Object/MachOObject.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Memory.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/system_error.h"
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using namespace llvm;
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using namespace llvm::object;
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static cl::list<std::string>
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InputFileList(cl::Positional, cl::ZeroOrMore,
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cl::desc("<input file>"));
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enum ActionType {
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AC_Execute
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};
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static cl::opt<ActionType>
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Action(cl::desc("Action to perform:"),
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cl::init(AC_Execute),
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cl::values(clEnumValN(AC_Execute, "execute",
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"Load, link, and execute the inputs."),
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clEnumValEnd));
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static cl::opt<std::string>
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EntryPoint("entry",
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cl::desc("Function to call as entry point."),
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cl::init("_main"));
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/* *** */
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// A trivial memory manager that doesn't do anything fancy, just uses the
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// support library allocation routines directly.
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class TrivialMemoryManager : public RTDyldMemoryManager {
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public:
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SmallVector<sys::MemoryBlock, 16> FunctionMemory;
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SmallVector<sys::MemoryBlock, 16> DataMemory;
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uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
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unsigned SectionID);
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uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
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unsigned SectionID);
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virtual void *getPointerToNamedFunction(const std::string &Name,
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bool AbortOnFailure = true) {
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return 0;
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}
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// Invalidate instruction cache for sections with execute permissions.
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// Some platforms with separate data cache and instruction cache require
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// explicit cache flush, otherwise JIT code manipulations (like resolved
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// relocations) will get to the data cache but not to the instruction cache.
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virtual void invalidateInstructionCache();
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};
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uint8_t *TrivialMemoryManager::allocateCodeSection(uintptr_t Size,
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unsigned Alignment,
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unsigned SectionID) {
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sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, 0, 0);
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FunctionMemory.push_back(MB);
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return (uint8_t*)MB.base();
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}
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uint8_t *TrivialMemoryManager::allocateDataSection(uintptr_t Size,
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unsigned Alignment,
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unsigned SectionID) {
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sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, 0, 0);
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DataMemory.push_back(MB);
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return (uint8_t*)MB.base();
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}
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void TrivialMemoryManager::invalidateInstructionCache() {
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for (int i = 0, e = FunctionMemory.size(); i != e; ++i)
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sys::Memory::InvalidateInstructionCache(FunctionMemory[i].base(),
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FunctionMemory[i].size());
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for (int i = 0, e = DataMemory.size(); i != e; ++i)
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sys::Memory::InvalidateInstructionCache(DataMemory[i].base(),
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DataMemory[i].size());
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}
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static const char *ProgramName;
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static void Message(const char *Type, const Twine &Msg) {
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errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
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}
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static int Error(const Twine &Msg) {
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Message("error", Msg);
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return 1;
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}
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/* *** */
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static int executeInput() {
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// Instantiate a dynamic linker.
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TrivialMemoryManager *MemMgr = new TrivialMemoryManager;
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RuntimeDyld Dyld(MemMgr);
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// If we don't have any input files, read from stdin.
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if (!InputFileList.size())
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InputFileList.push_back("-");
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for(unsigned i = 0, e = InputFileList.size(); i != e; ++i) {
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// Load the input memory buffer.
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OwningPtr<MemoryBuffer> InputBuffer;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFileList[i],
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InputBuffer))
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return Error("unable to read input: '" + ec.message() + "'");
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// Load the object file into it.
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if (Dyld.loadObject(InputBuffer.take())) {
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return Error(Dyld.getErrorString());
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}
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}
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// Resolve all the relocations we can.
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Dyld.resolveRelocations();
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// Clear instruction cache before code will be executed.
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MemMgr->invalidateInstructionCache();
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// FIXME: Error out if there are unresolved relocations.
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// Get the address of the entry point (_main by default).
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void *MainAddress = Dyld.getSymbolAddress(EntryPoint);
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if (MainAddress == 0)
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return Error("no definition for '" + EntryPoint + "'");
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// Invalidate the instruction cache for each loaded function.
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for (unsigned i = 0, e = MemMgr->FunctionMemory.size(); i != e; ++i) {
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sys::MemoryBlock &Data = MemMgr->FunctionMemory[i];
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// Make sure the memory is executable.
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std::string ErrorStr;
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sys::Memory::InvalidateInstructionCache(Data.base(), Data.size());
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if (!sys::Memory::setExecutable(Data, &ErrorStr))
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return Error("unable to mark function executable: '" + ErrorStr + "'");
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}
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// Dispatch to _main().
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errs() << "loaded '" << EntryPoint << "' at: " << (void*)MainAddress << "\n";
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int (*Main)(int, const char**) =
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(int(*)(int,const char**)) uintptr_t(MainAddress);
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const char **Argv = new const char*[2];
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// Use the name of the first input object module as argv[0] for the target.
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Argv[0] = InputFileList[0].c_str();
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Argv[1] = 0;
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return Main(1, Argv);
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}
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int main(int argc, char **argv) {
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ProgramName = argv[0];
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
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switch (Action) {
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case AC_Execute:
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return executeInput();
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}
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}
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