mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 04:29:21 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9027 91177308-0d34-0410-b5e6-96231b3b80d8
308 lines
9.9 KiB
C++
308 lines
9.9 KiB
C++
//===- gccld.cpp - LLVM 'ld' compatible linker ----------------------------===//
|
|
//
|
|
// This utility is intended to be compatible with GCC, and follows standard
|
|
// system 'ld' conventions. As such, the default output file is ./a.out.
|
|
// Additionally, this program outputs a shell script that is used to invoke LLI
|
|
// to execute the program. In this manner, the generated executable (a.out for
|
|
// example), is directly executable, whereas the bytecode file actually lives in
|
|
// the a.out.bc file generated by this program. Also, Force is on by default.
|
|
//
|
|
// Note that if someone (or a script) deletes the executable program generated,
|
|
// the .bc file will be left around. Considering that this is a temporary hack,
|
|
// I'm not too worried about this.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "gccld.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/Bytecode/Reader.h"
|
|
#include "llvm/Bytecode/WriteBytecodePass.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Transforms/IPO.h"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Transforms/Utils/Linker.h"
|
|
#include "Support/CommandLine.h"
|
|
#include "Support/FileUtilities.h"
|
|
#include "Support/Signals.h"
|
|
#include "Support/SystemUtils.h"
|
|
#include <fstream>
|
|
#include <memory>
|
|
|
|
namespace {
|
|
cl::list<std::string>
|
|
InputFilenames(cl::Positional, cl::desc("<input bytecode files>"),
|
|
cl::OneOrMore);
|
|
|
|
cl::opt<std::string>
|
|
OutputFilename("o", cl::desc("Override output filename"), cl::init("a.out"),
|
|
cl::value_desc("filename"));
|
|
|
|
cl::opt<bool>
|
|
Verbose("v", cl::desc("Print information about actions taken"));
|
|
|
|
cl::list<std::string>
|
|
LibPaths("L", cl::desc("Specify a library search path"), cl::Prefix,
|
|
cl::value_desc("directory"));
|
|
|
|
cl::list<std::string>
|
|
Libraries("l", cl::desc("Specify libraries to link to"), cl::Prefix,
|
|
cl::value_desc("library prefix"));
|
|
|
|
cl::opt<bool>
|
|
Strip("s", cl::desc("Strip symbol info from executable"));
|
|
|
|
cl::opt<bool>
|
|
NoInternalize("disable-internalize",
|
|
cl::desc("Do not mark all symbols as internal"));
|
|
static cl::alias
|
|
ExportDynamic("export-dynamic", cl::desc("Alias for -disable-internalize"),
|
|
cl::aliasopt(NoInternalize));
|
|
|
|
cl::opt<bool>
|
|
LinkAsLibrary("link-as-library", cl::desc("Link the .bc files together as a"
|
|
" library, not an executable"));
|
|
|
|
cl::opt<bool>
|
|
Native("native",
|
|
cl::desc("Generate a native binary instead of a shell script"));
|
|
|
|
// Compatibility options that are ignored but supported by LD
|
|
cl::opt<std::string>
|
|
CO3("soname", cl::Hidden, cl::desc("Compatibility option: ignored"));
|
|
cl::opt<std::string>
|
|
CO4("version-script", cl::Hidden, cl::desc("Compatibility option: ignored"));
|
|
cl::opt<bool>
|
|
CO5("eh-frame-hdr", cl::Hidden, cl::desc("Compatibility option: ignored"));
|
|
cl::opt<bool>
|
|
CO6("r", cl::Hidden, cl::desc("Compatibility option: ignored"));
|
|
}
|
|
|
|
//
|
|
// Function: PrintAndReturn ()
|
|
//
|
|
// Description:
|
|
// Prints a message (usually error message) to standard error (stderr) and
|
|
// returns a value usable for an exit status.
|
|
//
|
|
// Inputs:
|
|
// progname - The name of the program (i.e. argv[0]).
|
|
// Message - The message to print to standard error.
|
|
// Extra - Extra information to print between the program name and thei
|
|
// message. It is optional.
|
|
//
|
|
// Outputs:
|
|
// None.
|
|
//
|
|
// Return value:
|
|
// Returns a value that can be used as the exit status (i.e. for exit()).
|
|
//
|
|
int
|
|
PrintAndReturn (const char *progname,
|
|
const std::string &Message,
|
|
const std::string &Extra)
|
|
{
|
|
std::cerr << progname << Extra << ": " << Message << "\n";
|
|
return 1;
|
|
}
|
|
|
|
//
|
|
//
|
|
// Function: CopyEnv()
|
|
//
|
|
// Description:
|
|
// This function takes an array of environment variables and makes a
|
|
// copy of it. This copy can then be manipulated any way the caller likes
|
|
// without affecting the process's real environment.
|
|
//
|
|
// Inputs:
|
|
// envp - An array of C strings containing an environment.
|
|
//
|
|
// Outputs:
|
|
// None.
|
|
//
|
|
// Return value:
|
|
// NULL - An error occurred.
|
|
//
|
|
// Otherwise, a pointer to a new array of C strings is returned. Every string
|
|
// in the array is a duplicate of the one in the original array (i.e. we do
|
|
// not copy the char *'s from one array to another).
|
|
//
|
|
char ** CopyEnv(char ** const envp) {
|
|
// Count the number of entries in the old list;
|
|
unsigned entries; // The number of entries in the old environment list
|
|
for (entries = 0; envp[entries] != NULL; entries++)
|
|
{
|
|
;
|
|
}
|
|
|
|
// Add one more entry for the NULL pointer that ends the list.
|
|
++entries;
|
|
|
|
// If there are no entries at all, just return NULL.
|
|
if (entries == 0)
|
|
return NULL;
|
|
|
|
// Allocate a new environment list.
|
|
char **newenv;
|
|
if ((newenv = new (char *) [entries]) == NULL)
|
|
return NULL;
|
|
|
|
// Make a copy of the list. Don't forget the NULL that ends the list.
|
|
entries = 0;
|
|
while (envp[entries] != NULL) {
|
|
newenv[entries] = new char[strlen (envp[entries]) + 1];
|
|
strcpy (newenv[entries], envp[entries]);
|
|
++entries;
|
|
}
|
|
newenv[entries] = NULL;
|
|
|
|
return newenv;
|
|
}
|
|
|
|
|
|
//
|
|
// Function: RemoveEnv()
|
|
//
|
|
// Description:
|
|
// Remove the specified environment variable from the environment array.
|
|
//
|
|
// Inputs:
|
|
// name - The name of the variable to remove. It cannot be NULL.
|
|
// envp - The array of environment variables. It cannot be NULL.
|
|
//
|
|
// Outputs:
|
|
// envp - The pointer to the specified variable name is removed.
|
|
//
|
|
// Return value:
|
|
// None.
|
|
//
|
|
// Notes:
|
|
// This is mainly done because functions to remove items from the environment
|
|
// are not available across all platforms. In particular, Solaris does not
|
|
// seem to have an unsetenv() function or a setenv() function (or they are
|
|
// undocumented if they do exist).
|
|
//
|
|
void RemoveEnv(const char * name, char ** const envp) {
|
|
for (unsigned index=0; envp[index] != NULL; index++) {
|
|
// Find the first equals sign in the array and make it an EOS character.
|
|
char *p = strchr (envp[index], '=');
|
|
if (p == NULL)
|
|
continue;
|
|
else
|
|
*p = '\0';
|
|
|
|
// Compare the two strings. If they are equal, zap this string.
|
|
// Otherwise, restore it.
|
|
if (!strcmp(name, envp[index]))
|
|
*envp[index] = '\0';
|
|
else
|
|
*p = '=';
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv, char **envp) {
|
|
cl::ParseCommandLineOptions(argc, argv, " llvm linker for GCC\n");
|
|
|
|
std::string ErrorMessage;
|
|
std::auto_ptr<Module> Composite(LoadObject(InputFilenames[0], ErrorMessage));
|
|
if (Composite.get() == 0)
|
|
return PrintAndReturn(argv[0], ErrorMessage);
|
|
|
|
// We always look first in the current directory when searching for libraries.
|
|
LibPaths.insert(LibPaths.begin(), ".");
|
|
|
|
// If the user specified an extra search path in their environment, respect
|
|
// it.
|
|
if (char *SearchPath = getenv("LLVM_LIB_SEARCH_PATH"))
|
|
LibPaths.push_back(SearchPath);
|
|
|
|
// Remove any consecutive duplicates of the same library...
|
|
Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
|
|
Libraries.end());
|
|
|
|
// Link in all of the files
|
|
if (LinkFiles(argv[0], Composite.get(), InputFilenames, Verbose))
|
|
return 1; // Error already printed
|
|
LinkLibraries(argv[0], Composite.get(), Libraries, LibPaths, Verbose, Native);
|
|
|
|
// Link in all of the libraries next...
|
|
|
|
// Create the output file.
|
|
std::string RealBytecodeOutput = OutputFilename;
|
|
if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
|
|
std::ofstream Out(RealBytecodeOutput.c_str());
|
|
if (!Out.good())
|
|
return PrintAndReturn(argv[0], "error opening '" + RealBytecodeOutput +
|
|
"' for writing!");
|
|
|
|
// Ensure that the bytecode file gets removed from the disk if we get a
|
|
// SIGINT signal.
|
|
RemoveFileOnSignal(RealBytecodeOutput);
|
|
|
|
// Generate the bytecode file.
|
|
if (GenerateBytecode(Composite.get(), Strip, !NoInternalize, &Out)) {
|
|
Out.close();
|
|
return PrintAndReturn(argv[0], "error generating bytcode");
|
|
}
|
|
|
|
// Close the bytecode file.
|
|
Out.close();
|
|
|
|
// If we are not linking a library, generate either a native executable
|
|
// or a JIT shell script, depending upon what the user wants.
|
|
if (!LinkAsLibrary) {
|
|
// If the user wants to generate a native executable, compile it from the
|
|
// bytecode file.
|
|
//
|
|
// Otherwise, create a script that will run the bytecode through the JIT.
|
|
if (Native) {
|
|
// Name of the Assembly Language output file
|
|
std::string AssemblyFile = OutputFilename + ".s";
|
|
|
|
// Mark the output files for removal if we get an interrupt.
|
|
RemoveFileOnSignal(AssemblyFile);
|
|
RemoveFileOnSignal(OutputFilename);
|
|
|
|
// Determine the locations of the llc and gcc programs.
|
|
std::string llc = FindExecutable("llc", argv[0]);
|
|
std::string gcc = FindExecutable("gcc", argv[0]);
|
|
if (llc.empty())
|
|
return PrintAndReturn(argv[0], "Failed to find llc");
|
|
|
|
if (gcc.empty())
|
|
return PrintAndReturn(argv[0], "Failed to find gcc");
|
|
|
|
// Generate an assembly language file for the bytecode.
|
|
if (Verbose) std::cout << "Generating Assembly Code\n";
|
|
GenerateAssembly(AssemblyFile, RealBytecodeOutput, llc, envp);
|
|
if (Verbose) std::cout << "Generating Native Code\n";
|
|
GenerateNative(OutputFilename, AssemblyFile, Libraries, LibPaths,
|
|
gcc, envp);
|
|
|
|
// Remove the assembly language file.
|
|
removeFile (AssemblyFile);
|
|
} else {
|
|
// Output the script to start the program...
|
|
std::ofstream Out2(OutputFilename.c_str());
|
|
if (!Out2.good())
|
|
return PrintAndReturn(argv[0], "error opening '" + OutputFilename +
|
|
"' for writing!");
|
|
Out2 << "#!/bin/sh\nlli -q $0.bc $*\n";
|
|
Out2.close();
|
|
}
|
|
|
|
// Make the script executable...
|
|
MakeFileExecutable(OutputFilename);
|
|
|
|
// Make the bytecode file readable and directly executable in LLEE as well
|
|
MakeFileExecutable(RealBytecodeOutput);
|
|
MakeFileReadable(RealBytecodeOutput);
|
|
}
|
|
|
|
return 0;
|
|
}
|