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-rw-r--r--tools/gccld/GenerateCode.cpp461
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diff --git a/tools/gccld/GenerateCode.cpp b/tools/gccld/GenerateCode.cpp
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-//===- GenerateCode.cpp - Functions for generating executable files ------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains functions for generating executable files once linking
-// has finished. This includes generating a shell script to run the JIT or
-// a native executable derived from the bytecode.
-//
-//===----------------------------------------------------------------------===//
-
-#include "gccld.h"
-#include "llvm/System/Program.h"
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/Analysis/LoadValueNumbering.h"
-#include "llvm/Analysis/Passes.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Bytecode/Archive.h"
-#include "llvm/Bytecode/WriteBytecodePass.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/Support/SystemUtils.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Streams.h"
-using namespace llvm;
-
-namespace {
- cl::opt<bool>
- DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
-
- cl::opt<bool>
- Verify("verify", cl::desc("Verify intermediate results of all passes"));
-
- cl::opt<bool>
- DisableOptimizations("disable-opt",
- cl::desc("Do not run any optimization passes"));
-
- cl::opt<bool>
- NoCompress("disable-compression", cl::init(true),
- cl::desc("Don't compress the generated bytecode"));
-}
-
-/// CopyEnv - 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.
-///
-/// 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).
-///
-static 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++)
- /*empty*/;
-
- // 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 = new char* [entries];
- 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;
-}
-
-
-/// RemoveEnv - 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.
-///
-/// 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).
-///
-static 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 = '=';
- }
-}
-
-static void dumpArgs(const char **args) {
- cerr << *args++;
- while (*args)
- cerr << ' ' << *args++;
- cerr << '\n' << std::flush;
-}
-
-static inline void addPass(PassManager &PM, Pass *P) {
- // Add the pass to the pass manager...
- PM.add(P);
-
- // If we are verifying all of the intermediate steps, add the verifier...
- if (Verify) PM.add(createVerifierPass());
-}
-
-static bool isBytecodeLibrary(const sys::Path &FullPath) {
- // Check for a bytecode file
- if (FullPath.isBytecodeFile()) return true;
- // Check for a dynamic library file
- if (FullPath.isDynamicLibrary()) return false;
- // Check for a true bytecode archive file
- if (FullPath.isArchive() ) {
- std::string ErrorMessage;
- Archive* ar = Archive::OpenAndLoadSymbols( FullPath, &ErrorMessage );
- return ar->isBytecodeArchive();
- }
- return false;
-}
-
-static bool isBytecodeLPath(const std::string &LibPath) {
- sys::Path LPath(LibPath);
-
- // Make sure it exists and is a directory
- sys::FileStatus Status;
- if (LPath.getFileStatus(Status) || !Status.isDir)
- return false;
-
- // Grab the contents of the -L path
- std::set<sys::Path> Files;
- if (LPath.getDirectoryContents(Files, 0))
- return false;
-
- // Iterate over the contents one by one to determine
- // if this -L path has any bytecode shared libraries
- // or archives
- std::set<sys::Path>::iterator File = Files.begin();
- std::string dllsuffix = sys::Path::GetDLLSuffix();
- for (; File != Files.end(); ++File) {
-
- // Not a file?
- if (File->getFileStatus(Status) || Status.isDir)
- continue;
-
- std::string path = File->toString();
-
- // Check for an ending '.dll', '.so' or '.a' suffix as all
- // other files are not of interest to us here
- if (path.find(dllsuffix, path.size()-dllsuffix.size()) == std::string::npos
- && path.find(".a", path.size()-2) == std::string::npos)
- continue;
-
- // Finally, check to see if the file is a true bytecode file
- if (isBytecodeLibrary(*File))
- return true;
- }
- return false;
-}
-
-/// GenerateBytecode - generates a bytecode file from the specified module.
-///
-/// Inputs:
-/// M - The module for which bytecode should be generated.
-/// StripLevel - 2 if we should strip all symbols, 1 if we should strip
-/// debug info.
-/// Internalize - Flags whether all symbols should be marked internal.
-/// Out - Pointer to file stream to which to write the output.
-///
-/// Returns non-zero value on error.
-///
-int llvm::GenerateBytecode(Module *M, int StripLevel, bool Internalize,
- std::ostream *Out) {
- // In addition to just linking the input from GCC, we also want to spiff it up
- // a little bit. Do this now.
- PassManager Passes;
-
- if (Verify) Passes.add(createVerifierPass());
-
- // Add an appropriate TargetData instance for this module...
- addPass(Passes, new TargetData(M));
-
- if (!DisableOptimizations) {
- // Now that composite has been compiled, scan through the module, looking
- // for a main function. If main is defined, mark all other functions
- // internal.
- addPass(Passes, createInternalizePass(Internalize));
-
- // Propagate constants at call sites into the functions they call. This
- // opens opportunities for globalopt (and inlining) by substituting function
- // pointers passed as arguments to direct uses of functions.
- addPass(Passes, createIPSCCPPass());
-
- // Now that we internalized some globals, see if we can hack on them!
- addPass(Passes, createGlobalOptimizerPass());
-
- // Linking modules together can lead to duplicated global constants, only
- // keep one copy of each constant...
- addPass(Passes, createConstantMergePass());
-
- // Remove unused arguments from functions...
- addPass(Passes, createDeadArgEliminationPass());
-
- // Reduce the code after globalopt and ipsccp. Both can open up significant
- // simplification opportunities, and both can propagate functions through
- // function pointers. When this happens, we often have to resolve varargs
- // calls, etc, so let instcombine do this.
- addPass(Passes, createInstructionCombiningPass());
-
- if (!DisableInline)
- addPass(Passes, createFunctionInliningPass()); // Inline small functions
-
- addPass(Passes, createPruneEHPass()); // Remove dead EH info
- addPass(Passes, createGlobalOptimizerPass()); // Optimize globals again.
- addPass(Passes, createGlobalDCEPass()); // Remove dead functions
-
- // If we didn't decide to inline a function, check to see if we can
- // transform it to pass arguments by value instead of by reference.
- addPass(Passes, createArgumentPromotionPass());
-
- // The IPO passes may leave cruft around. Clean up after them.
- addPass(Passes, createInstructionCombiningPass());
-
- addPass(Passes, createScalarReplAggregatesPass()); // Break up allocas
-
- // Run a few AA driven optimizations here and now, to cleanup the code.
- addPass(Passes, createGlobalsModRefPass()); // IP alias analysis
-
- addPass(Passes, createLICMPass()); // Hoist loop invariants
- addPass(Passes, createLoadValueNumberingPass()); // GVN for load instrs
- addPass(Passes, createGCSEPass()); // Remove common subexprs
- addPass(Passes, createDeadStoreEliminationPass()); // Nuke dead stores
-
- // Cleanup and simplify the code after the scalar optimizations.
- addPass(Passes, createInstructionCombiningPass());
-
- // Delete basic blocks, which optimization passes may have killed...
- addPass(Passes, createCFGSimplificationPass());
-
- // Now that we have optimized the program, discard unreachable functions...
- addPass(Passes, createGlobalDCEPass());
- }
-
- // If the -s or -S command line options were specified, strip the symbols out
- // of the resulting program to make it smaller. -s and -S are GLD options
- // that we are supporting.
- if (StripLevel)
- addPass(Passes, createStripSymbolsPass(StripLevel == 1));
-
- // Make sure everything is still good.
- Passes.add(createVerifierPass());
-
- // Add the pass that writes bytecode to the output file...
- OStream L(*Out);
- addPass(Passes, new WriteBytecodePass(&L, false, !NoCompress));
-
- // Run our queue of passes all at once now, efficiently.
- Passes.run(*M);
-
- return 0;
-}
-
-/// GenerateAssembly - generates a native assembly language source file from the
-/// specified bytecode file.
-///
-/// Inputs:
-/// InputFilename - The name of the output bytecode file.
-/// OutputFilename - The name of the file to generate.
-/// llc - The pathname to use for LLC.
-///
-/// Return non-zero value on error.
-///
-int llvm::GenerateAssembly(const std::string &OutputFilename,
- const std::string &InputFilename,
- const sys::Path &llc,
- std::string& ErrMsg,
- bool Verbose) {
- // Run LLC to convert the bytecode file into assembly code.
- std::vector<const char*> args;
- args.push_back(llc.c_str());
- args.push_back("-f");
- args.push_back("-o");
- args.push_back(OutputFilename.c_str());
- args.push_back(InputFilename.c_str());
- args.push_back(0);
- if (Verbose) dumpArgs(&args[0]);
- return sys::Program::ExecuteAndWait(llc, &args[0],0,0,0,&ErrMsg);
-}
-
-/// GenerateCFile - generates a C source file from the specified bytecode file.
-int llvm::GenerateCFile(const std::string &OutputFile,
- const std::string &InputFile,
- const sys::Path &llc,
- std::string& ErrMsg,
- bool Verbose) {
- // Run LLC to convert the bytecode file into C.
- std::vector<const char*> args;
- args.push_back(llc.c_str());
- args.push_back("-march=c");
- args.push_back("-f");
- args.push_back("-o");
- args.push_back(OutputFile.c_str());
- args.push_back(InputFile.c_str());
- args.push_back(0);
- if (Verbose) dumpArgs(&args[0]);
- return sys::Program::ExecuteAndWait(llc, &args[0],0,0,0,&ErrMsg);
-}
-
-/// GenerateNative - generates a native executable file from the specified
-/// assembly source file.
-///
-/// Inputs:
-/// InputFilename - The name of the output bytecode file.
-/// OutputFilename - The name of the file to generate.
-/// Libraries - The list of libraries with which to link.
-/// gcc - The pathname to use for GGC.
-/// envp - A copy of the process's current environment.
-///
-/// Outputs:
-/// None.
-///
-/// Returns non-zero value on error.
-///
-int llvm::GenerateNative(const std::string &OutputFilename,
- const std::string &InputFilename,
- const std::vector<std::string> &LibPaths,
- const std::vector<std::string> &Libraries,
- const sys::Path &gcc, char ** const envp,
- bool Shared,
- bool ExportAllAsDynamic,
- const std::vector<std::string> &RPaths,
- const std::string &SOName,
- std::string& ErrMsg,
- bool Verbose) {
- // Remove these environment variables from the environment of the
- // programs that we will execute. It appears that GCC sets these
- // environment variables so that the programs it uses can configure
- // themselves identically.
- //
- // However, when we invoke GCC below, we want it to use its normal
- // configuration. Hence, we must sanitize its environment.
- char ** clean_env = CopyEnv(envp);
- if (clean_env == NULL)
- return 1;
- RemoveEnv("LIBRARY_PATH", clean_env);
- RemoveEnv("COLLECT_GCC_OPTIONS", clean_env);
- RemoveEnv("GCC_EXEC_PREFIX", clean_env);
- RemoveEnv("COMPILER_PATH", clean_env);
- RemoveEnv("COLLECT_GCC", clean_env);
-
-
- // Run GCC to assemble and link the program into native code.
- //
- // Note:
- // We can't just assemble and link the file with the system assembler
- // and linker because we don't know where to put the _start symbol.
- // GCC mysteriously knows how to do it.
- std::vector<const char*> args;
- args.push_back(gcc.c_str());
- args.push_back("-fno-strict-aliasing");
- args.push_back("-O3");
- args.push_back("-o");
- args.push_back(OutputFilename.c_str());
- args.push_back(InputFilename.c_str());
-
- // StringsToDelete - We don't want to call c_str() on temporary strings.
- // If we need a temporary string, copy it here so that the memory is not
- // reclaimed until after the exec call. All of these strings are allocated
- // with strdup.
- std::vector<char*> StringsToDelete;
-
- if (Shared) args.push_back("-shared");
- if (ExportAllAsDynamic) args.push_back("-export-dynamic");
- if (!RPaths.empty()) {
- for (std::vector<std::string>::const_iterator I = RPaths.begin(),
- E = RPaths.end(); I != E; I++) {
- std::string rp = "-Wl,-rpath," + *I;
- StringsToDelete.push_back(strdup(rp.c_str()));
- args.push_back(StringsToDelete.back());
- }
- }
- if (!SOName.empty()) {
- std::string so = "-Wl,-soname," + SOName;
- StringsToDelete.push_back(strdup(so.c_str()));
- args.push_back(StringsToDelete.back());
- }
-
- // Add in the libpaths to find the libraries.
- //
- // Note:
- // When gccld is called from the llvm-gxx frontends, the -L paths for
- // the LLVM cfrontend install paths are appended. We don't want the
- // native linker to use these -L paths as they contain bytecode files.
- // Further, we don't want any -L paths that contain bytecode shared
- // libraries or true bytecode archive files. We omit them in all such
- // cases.
- for (unsigned index = 0; index < LibPaths.size(); index++)
- if (!isBytecodeLPath(LibPaths[index])) {
- std::string Tmp = "-L"+LibPaths[index];
- StringsToDelete.push_back(strdup(Tmp.c_str()));
- args.push_back(StringsToDelete.back());
- }
-
- // Add in the libraries to link.
- for (unsigned index = 0; index < Libraries.size(); index++)
- // HACK: If this is libg, discard it. This gets added by the compiler
- // driver when doing: 'llvm-gcc main.c -Wl,-native -o a.out -g'. Note that
- // this should really be fixed by changing the llvm-gcc compiler driver.
- if (Libraries[index] != "crtend" && Libraries[index] != "g") {
- std::string Tmp = "-l"+Libraries[index];
- StringsToDelete.push_back(strdup(Tmp.c_str()));
- args.push_back(StringsToDelete.back());
- }
- args.push_back(0); // Null terminate.
-
- // Run the compiler to assembly and link together the program.
- if (Verbose) dumpArgs(&args[0]);
- int Res = sys::Program::ExecuteAndWait(
- gcc, &args[0],(const char**)clean_env,0,0,&ErrMsg);
-
- delete [] clean_env;
-
- while (!StringsToDelete.empty()) {
- free(StringsToDelete.back());
- StringsToDelete.pop_back();
- }
- return Res;
-}
-
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