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302 lines
9.7 KiB
C++
302 lines
9.7 KiB
C++
//===- ReaderWrappers.cpp - Parse bytecode from file or buffer -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements loading and parsing a bytecode file and parsing a
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// bytecode module from a given buffer.
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//
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//===----------------------------------------------------------------------===//
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#include "ReaderInternals.h"
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#include "llvm/Module.h"
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#include "llvm/Instructions.h"
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#include "Support/StringExtras.h"
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#include "Config/fcntl.h"
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#include <sys/stat.h>
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#include "Config/unistd.h"
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#include "Config/sys/mman.h"
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// BytecodeFileReader - Read from an mmap'able file descriptor.
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//
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namespace {
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/// FDHandle - Simple handle class to make sure a file descriptor gets closed
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/// when the object is destroyed.
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///
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class FDHandle {
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int FD;
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public:
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FDHandle(int fd) : FD(fd) {}
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operator int() const { return FD; }
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~FDHandle() {
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if (FD != -1) close(FD);
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}
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};
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/// BytecodeFileReader - parses a bytecode file from a file
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///
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class BytecodeFileReader : public BytecodeParser {
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private:
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unsigned char *Buffer;
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int Length;
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BytecodeFileReader(const BytecodeFileReader&); // Do not implement
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void operator=(const BytecodeFileReader &BFR); // Do not implement
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public:
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BytecodeFileReader(const std::string &Filename);
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~BytecodeFileReader();
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};
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}
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BytecodeFileReader::BytecodeFileReader(const std::string &Filename) {
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FDHandle FD = open(Filename.c_str(), O_RDONLY);
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if (FD == -1)
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throw std::string("Error opening file!");
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// Stat the file to get its length...
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struct stat StatBuf;
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if (fstat(FD, &StatBuf) == -1 || StatBuf.st_size == 0)
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throw std::string("Error stat'ing file!");
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// mmap in the file all at once...
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Length = StatBuf.st_size;
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Buffer = (unsigned char*)mmap(0, Length, PROT_READ, MAP_PRIVATE, FD, 0);
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if (Buffer == (unsigned char*)MAP_FAILED)
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throw std::string("Error mmapping file!");
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try {
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// Parse the bytecode we mmapped in
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ParseBytecode(Buffer, Length, Filename);
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} catch (...) {
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munmap((char*)Buffer, Length);
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throw;
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}
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}
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BytecodeFileReader::~BytecodeFileReader() {
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// Unmmap the bytecode...
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munmap((char*)Buffer, Length);
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}
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//===----------------------------------------------------------------------===//
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// BytecodeBufferReader - Read from a memory buffer
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//
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namespace {
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/// BytecodeBufferReader - parses a bytecode file from a buffer
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///
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class BytecodeBufferReader : public BytecodeParser {
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private:
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const unsigned char *Buffer;
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bool MustDelete;
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BytecodeBufferReader(const BytecodeBufferReader&); // Do not implement
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void operator=(const BytecodeBufferReader &BFR); // Do not implement
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public:
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BytecodeBufferReader(const unsigned char *Buf, unsigned Length,
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const std::string &ModuleID);
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~BytecodeBufferReader();
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};
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}
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BytecodeBufferReader::BytecodeBufferReader(const unsigned char *Buf,
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unsigned Length,
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const std::string &ModuleID)
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{
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// If not aligned, allocate a new buffer to hold the bytecode...
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const unsigned char *ParseBegin = 0;
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if ((intptr_t)Buf & 3) {
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Buffer = new unsigned char[Length+4];
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unsigned Offset = 4 - ((intptr_t)Buffer & 3); // Make sure it's aligned
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ParseBegin = Buffer + Offset;
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memcpy((unsigned char*)ParseBegin, Buf, Length); // Copy it over
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MustDelete = true;
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} else {
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// If we don't need to copy it over, just use the caller's copy
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ParseBegin = Buffer = Buf;
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MustDelete = false;
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}
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try {
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ParseBytecode(ParseBegin, Length, ModuleID);
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} catch (...) {
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if (MustDelete) delete [] Buffer;
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throw;
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}
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}
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BytecodeBufferReader::~BytecodeBufferReader() {
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if (MustDelete) delete [] Buffer;
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}
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//===----------------------------------------------------------------------===//
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// BytecodeStdinReader - Read bytecode from Standard Input
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//
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namespace {
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/// BytecodeStdinReader - parses a bytecode file from stdin
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///
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class BytecodeStdinReader : public BytecodeParser {
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private:
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std::vector<unsigned char> FileData;
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unsigned char *FileBuf;
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BytecodeStdinReader(const BytecodeStdinReader&); // Do not implement
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void operator=(const BytecodeStdinReader &BFR); // Do not implement
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public:
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BytecodeStdinReader();
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};
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}
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BytecodeStdinReader::BytecodeStdinReader() {
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int BlockSize;
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unsigned char Buffer[4096*4];
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// Read in all of the data from stdin, we cannot mmap stdin...
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while ((BlockSize = ::read(0 /*stdin*/, Buffer, 4096*4))) {
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if (BlockSize == -1)
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throw std::string("Error reading from stdin!");
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FileData.insert(FileData.end(), Buffer, Buffer+BlockSize);
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}
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if (FileData.empty())
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throw std::string("Standard Input empty!");
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FileBuf = &FileData[0];
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ParseBytecode(FileBuf, FileData.size(), "<stdin>");
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}
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//===----------------------------------------------------------------------===//
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// Varargs transmogrification code...
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//
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// CheckVarargs - This is used to automatically translate old-style varargs to
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// new style varargs for backwards compatibility.
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static ModuleProvider *CheckVarargs(ModuleProvider *MP) {
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Module *M = MP->getModule();
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// Check to see if va_start takes arguments...
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Function *F = M->getNamedFunction("llvm.va_start");
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if (F == 0) return MP; // No varargs use, just return.
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if (F->getFunctionType()->getNumParams() == 0)
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return MP; // Modern varargs processing, just return.
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// If we get to this point, we know that we have an old-style module.
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// Materialize the whole thing to perform the rewriting.
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MP->materializeModule();
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// If the user is making use of obsolete varargs intrinsics, adjust them for
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// the user.
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if (Function *F = M->getNamedFunction("llvm.va_start")) {
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assert(F->asize() == 1 && "Obsolete va_start takes 1 argument!");
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const Type *RetTy = F->getFunctionType()->getParamType(0);
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RetTy = cast<PointerType>(RetTy)->getElementType();
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Function *NF = M->getOrInsertFunction("llvm.va_start", RetTy, 0);
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for (Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E; )
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if (CallInst *CI = dyn_cast<CallInst>(*I++)) {
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Value *V = new CallInst(NF, "", CI);
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new StoreInst(V, CI->getOperand(1), CI);
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CI->getParent()->getInstList().erase(CI);
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}
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F->setName("");
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}
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if (Function *F = M->getNamedFunction("llvm.va_end")) {
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assert(F->asize() == 1 && "Obsolete va_end takes 1 argument!");
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const Type *ArgTy = F->getFunctionType()->getParamType(0);
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ArgTy = cast<PointerType>(ArgTy)->getElementType();
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Function *NF = M->getOrInsertFunction("llvm.va_end", Type::VoidTy,
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ArgTy, 0);
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for (Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E; )
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if (CallInst *CI = dyn_cast<CallInst>(*I++)) {
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Value *V = new LoadInst(CI->getOperand(1), "", CI);
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new CallInst(NF, V, "", CI);
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CI->getParent()->getInstList().erase(CI);
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}
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F->setName("");
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}
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if (Function *F = M->getNamedFunction("llvm.va_copy")) {
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assert(F->asize() == 2 && "Obsolete va_copy takes 2 argument!");
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const Type *ArgTy = F->getFunctionType()->getParamType(0);
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ArgTy = cast<PointerType>(ArgTy)->getElementType();
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Function *NF = M->getOrInsertFunction("llvm.va_copy", ArgTy,
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ArgTy, 0);
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for (Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E; )
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if (CallInst *CI = dyn_cast<CallInst>(*I++)) {
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Value *V = new CallInst(NF, CI->getOperand(2), "", CI);
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new StoreInst(V, CI->getOperand(1), CI);
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CI->getParent()->getInstList().erase(CI);
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}
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F->setName("");
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}
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return MP;
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}
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//===----------------------------------------------------------------------===//
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// Wrapper functions
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//===----------------------------------------------------------------------===//
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/// getBytecodeBufferModuleProvider - lazy function-at-a-time loading from a
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/// buffer
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ModuleProvider*
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getBytecodeBufferModuleProvider(const unsigned char *Buffer, unsigned Length,
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const std::string &ModuleID) {
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return CheckVarargs(new BytecodeBufferReader(Buffer, Length, ModuleID));
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}
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/// ParseBytecodeBuffer - Parse a given bytecode buffer
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///
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Module *ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
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const std::string &ModuleID, std::string *ErrorStr){
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try {
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std::auto_ptr<ModuleProvider>
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AMP(getBytecodeBufferModuleProvider(Buffer, Length, ModuleID));
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return AMP->releaseModule();
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} catch (std::string &err) {
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if (ErrorStr) *ErrorStr = err;
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return 0;
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}
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}
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/// getBytecodeModuleProvider - lazy function-at-a-time loading from a file
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///
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ModuleProvider *getBytecodeModuleProvider(const std::string &Filename) {
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if (Filename != std::string("-")) // Read from a file...
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return CheckVarargs(new BytecodeFileReader(Filename));
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else // Read from stdin
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return CheckVarargs(new BytecodeStdinReader());
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}
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/// ParseBytecodeFile - Parse the given bytecode file
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///
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Module *ParseBytecodeFile(const std::string &Filename, std::string *ErrorStr) {
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try {
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std::auto_ptr<ModuleProvider> AMP(getBytecodeModuleProvider(Filename));
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return AMP->releaseModule();
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} catch (std::string &err) {
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if (ErrorStr) *ErrorStr = err;
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return 0;
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}
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}
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} // End llvm namespace
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