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llvm-mirror/tools/llvm-as/llvm-as.cpp
Chris Lattner f28c74870f Reimplement the old and horrible bison parser for .ll files with a nice
and clean recursive descent parser.

This change has a couple of ramifications:
1. The parser code is about 400 lines shorter (in what we maintain, not
   including what is autogenerated).
2. The code should be significantly faster than the old code because we 
   don't have to work around bison's poor handling of datatypes with 
   ctors/dtors.  This also makes the code much more resistant to memory 
   leaks.
3. We now get caret diagnostics from the .ll parser, woo.
4. The actual diagnostics emited from the parser are completely different
   so a bunch of testcases had to be updated.
5. I now disallow "%ty = type opaque %ty = type i32".  There was no good
   reason to support this, it was just an accident of the old 
   implementation.  I have no reason to think that anyone is actually using
   this.
6. The syntax for sticking a global variable has changed to make it 
   unambiguous.  I don't think anyone is depending on this since only clang
   supports this and it is not solid yet, so I'm not worried about anything
   breaking.
7. This gets rid of the last use of bison, and along with it the .cvs files.
   I'll prune this from the makefiles as a subsequent commit.

There are a few minor cleanups that can be done after this commit (suggestions
welcome!) but this passes dejagnu testing and is ready for its time in the
limelight.

llvm-svn: 61558
2009-01-02 07:01:27 +00:00

147 lines
4.9 KiB
C++

//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility may be invoked in the following manner:
// llvm-as --help - Output information about command line switches
// llvm-as [options] - Read LLVM asm from stdin, write bitcode to stdout
// llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
// to the x.bc file.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Assembly/Parser.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Streams.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Signals.h"
#include <fstream>
#include <iostream>
#include <memory>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
static cl::opt<bool>
DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
static cl::opt<bool>
DisableVerify("disable-verify", cl::Hidden,
cl::desc("Do not run verifier on input LLVM (dangerous!)"));
int main(int argc, char **argv) {
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
sys::PrintStackTraceOnErrorSignal();
int exitCode = 0;
std::ostream *Out = 0;
try {
// Parse the file now...
ParseError Err;
std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err));
if (M.get() == 0) {
Err.PrintError(argv[0], errs());
return 1;
}
if (!DisableVerify) {
std::string Err;
if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
cerr << argv[0]
<< ": assembly parsed, but does not verify as correct!\n";
cerr << Err;
return 1;
}
}
if (DumpAsm) cerr << "Here's the assembly:\n" << *M.get();
if (OutputFilename != "") { // Specified an output filename?
if (OutputFilename != "-") { // Not stdout?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
std::ios::trunc | std::ios::binary);
} else { // Specified stdout
// FIXME: cout is not binary!
Out = &std::cout;
}
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &std::cout;
} else {
std::string IFN = InputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
// Source ends in .ll
OutputFilename = std::string(IFN.begin(), IFN.end()-3);
} else {
OutputFilename = IFN; // Append a .bc to it
}
OutputFilename += ".bc";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
std::ios::trunc | std::ios::binary);
// Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
}
if (!Out->good()) {
cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
return 1;
}
if (!DisableOutput)
if (Force || !CheckBitcodeOutputToConsole(Out,true))
WriteBitcodeToFile(M.get(), *Out);
} catch (const std::string& msg) {
cerr << argv[0] << ": " << msg << "\n";
exitCode = 1;
} catch (...) {
cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
exitCode = 1;
}
if (Out != &std::cout) delete Out;
return exitCode;
}