It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-ld/Makefile b/tools/llvm-ld/Makefile
new file mode 100644
index 0000000..f772504
--- /dev/null
+++ b/tools/llvm-ld/Makefile
@@ -0,0 +1,16 @@
+##===- tools/llvm-ld/Makefile ------------------------------*- Makefile -*-===##
+#
+# 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.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+
+TOOLNAME = llvm-ld
+LINK_COMPONENTS = ipo scalaropts linker archive bitwriter
+REQUIRES_EH := 1
+
+include $(LEVEL)/Makefile.common
diff --git a/tools/llvm-ld/Optimize.cpp b/tools/llvm-ld/Optimize.cpp
new file mode 100644
index 0000000..308fd54
--- /dev/null
+++ b/tools/llvm-ld/Optimize.cpp
@@ -0,0 +1,216 @@
+//===- Optimize.cpp - Optimize a complete program -------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements all optimization of the linked module for llvm-ld.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Analysis/LoadValueNumbering.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/System/DynamicLibrary.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Support/PassNameParser.h"
+#include "llvm/Support/PluginLoader.h"
+#include <iostream>
+using namespace llvm;
+
+// Pass Name Options as generated by the PassNameParser
+static cl::list<const PassInfo*, bool, PassNameParser>
+ OptimizationList(cl::desc("Optimizations available:"));
+
+// Optimization Enumeration
+enum OptimizationLevels {
+ OPT_FAST_COMPILE = 1,
+ OPT_SIMPLE = 2,
+ OPT_AGGRESSIVE = 3,
+ OPT_LINK_TIME = 4,
+ OPT_AGGRESSIVE_LINK_TIME = 5
+};
+
+// Optimization Options
+static cl::opt<OptimizationLevels> OptLevel(
+ cl::desc("Choose level of optimization to apply:"),
+ cl::init(OPT_FAST_COMPILE), cl::values(
+ clEnumValN(OPT_FAST_COMPILE,"O0",
+ "An alias for the -O1 option."),
+ clEnumValN(OPT_FAST_COMPILE,"O1",
+ "Optimize for linking speed, not execution speed."),
+ clEnumValN(OPT_SIMPLE,"O2",
+ "Perform only required/minimal optimizations"),
+ clEnumValN(OPT_AGGRESSIVE,"O3",
+ "An alias for the -O2 option."),
+ clEnumValN(OPT_LINK_TIME,"O4",
+ "Perform standard link time optimizations"),
+ clEnumValN(OPT_AGGRESSIVE_LINK_TIME,"O5",
+ "Perform aggressive link time optimizations"),
+ clEnumValEnd
+ )
+);
+
+static cl::opt<bool> DisableInline("disable-inlining",
+ cl::desc("Do not run the inliner pass"));
+
+static cl::opt<bool>
+DisableOptimizations("disable-opt",
+ cl::desc("Do not run any optimization passes"));
+
+static cl::opt<bool> DisableInternalize("disable-internalize",
+ cl::desc("Do not mark all symbols as internal"));
+
+static cl::opt<bool> VerifyEach("verify-each",
+ cl::desc("Verify intermediate results of all passes"));
+
+static cl::alias ExportDynamic("export-dynamic",
+ cl::aliasopt(DisableInternalize),
+ cl::desc("Alias for -disable-internalize"));
+
+static cl::opt<bool> Strip("strip-all",
+ cl::desc("Strip all symbol info from executable"));
+
+static cl::alias A0("s", cl::desc("Alias for --strip-all"),
+ cl::aliasopt(Strip));
+
+static cl::opt<bool> StripDebug("strip-debug",
+ cl::desc("Strip debugger symbol info from executable"));
+
+static cl::alias A1("S", cl::desc("Alias for --strip-debug"),
+ cl::aliasopt(StripDebug));
+
+// A utility function that adds a pass to the pass manager but will also add
+// a verifier pass after if we're supposed to verify.
+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 (VerifyEach)
+ PM.add(createVerifierPass());
+}
+
+namespace llvm {
+
+/// Optimize - Perform link time optimizations. This will run the scalar
+/// optimizations, any loaded plugin-optimization modules, and then the
+/// inter-procedural optimizations if applicable.
+void Optimize(Module* M) {
+
+ // Instantiate the pass manager to organize the passes.
+ PassManager Passes;
+
+ // If we're verifying, start off with a verification pass.
+ if (VerifyEach)
+ 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.
+ if (!DisableInternalize)
+ addPass(Passes, createInternalizePass(true));
+
+ // 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, createFastDeadStoreEliminationPass()); // 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 GNU ld options
+ // that we are supporting; they alias -strip-all and -strip-debug.
+ if (Strip || StripDebug)
+ addPass(Passes, createStripSymbolsPass(StripDebug && !Strip));
+
+ // Create a new optimization pass for each one specified on the command line
+ std::auto_ptr<TargetMachine> target;
+ for (unsigned i = 0; i < OptimizationList.size(); ++i) {
+ const PassInfo *Opt = OptimizationList[i];
+ if (Opt->getNormalCtor())
+ addPass(Passes, Opt->getNormalCtor()());
+ else
+ std::cerr << "llvm-ld: cannot create pass: " << Opt->getPassName()
+ << "\n";
+ }
+
+ // The user's passes may leave cruft around. Clean up after them them but
+ // only if we haven't got DisableOptimizations set
+ if (!DisableOptimizations) {
+ addPass(Passes, createInstructionCombiningPass());
+ addPass(Passes, createCFGSimplificationPass());
+ addPass(Passes, createDeadCodeEliminationPass());
+ addPass(Passes, createGlobalDCEPass());
+ }
+
+ // Make sure everything is still good.
+ Passes.add(createVerifierPass());
+
+ // Run our queue of passes all at once now, efficiently.
+ Passes.run(*M);
+}
+
+}
diff --git a/tools/llvm-ld/llvm-ld.cpp b/tools/llvm-ld/llvm-ld.cpp
new file mode 100644
index 0000000..46788b1
--- /dev/null
+++ b/tools/llvm-ld/llvm-ld.cpp
@@ -0,0 +1,653 @@
+//===- llvm-ld.cpp - LLVM 'ld' compatible linker --------------------------===//
+//
+// 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 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 bitcode 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 "llvm/LinkAllVMCore.h"
+#include "llvm/Linker.h"
+#include "llvm/System/Program.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetMachineRegistry.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/System/Signals.h"
+#include <fstream>
+#include <memory>
+using namespace llvm;
+
+// Input/Output Options
+static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
+ cl::desc("<input bitcode files>"));
+
+static cl::opt<std::string> OutputFilename("o", cl::init("a.out"),
+ cl::desc("Override output filename"),
+ cl::value_desc("filename"));
+
+static cl::opt<bool> Verbose("v",
+ cl::desc("Print information about actions taken"));
+
+static cl::list<std::string> LibPaths("L", cl::Prefix,
+ cl::desc("Specify a library search path"),
+ cl::value_desc("directory"));
+
+static cl::list<std::string> Libraries("l", cl::Prefix,
+ cl::desc("Specify libraries to link to"),
+ cl::value_desc("library prefix"));
+
+// Options to control the linking, optimization, and code gen processes
+static cl::opt<bool> LinkAsLibrary("link-as-library",
+ cl::desc("Link the .bc files together as a library, not an executable"));
+
+static cl::alias Relink("r", cl::aliasopt(LinkAsLibrary),
+ cl::desc("Alias for -link-as-library"));
+
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+ MachineArch("march", cl::desc("Architecture to generate assembly for:"));
+
+static cl::opt<bool> Native("native",
+ cl::desc("Generate a native binary instead of a shell script"));
+
+static cl::opt<bool>NativeCBE("native-cbe",
+ cl::desc("Generate a native binary with the C backend and GCC"));
+
+static cl::list<std::string> PostLinkOpts("post-link-opts",
+ cl::value_desc("path"),
+ cl::desc("Run one or more optimization programs after linking"));
+
+static cl::list<std::string> XLinker("Xlinker", cl::value_desc("option"),
+ cl::desc("Pass options to the system linker"));
+
+// Compatibility options that llvm-ld ignores but are supported for
+// compatibility with LD
+static cl::opt<std::string> CO3("soname", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+
+static cl::opt<std::string> CO4("version-script", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+
+static cl::opt<bool> CO5("eh-frame-hdr", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+
+static cl::opt<std::string> CO6("h", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+
+static cl::opt<bool> CO7("start-group", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+
+static cl::opt<bool> CO8("end-group", cl::Hidden,
+ cl::desc("Compatibility option: ignored"));
+
+/// This is just for convenience so it doesn't have to be passed around
+/// everywhere.
+static std::string progname;
+
+/// PrintAndExit - Prints a message to standard error and exits with error code
+///
+/// Inputs:
+/// Message - The message to print to standard error.
+///
+static void PrintAndExit(const std::string &Message, int errcode = 1) {
+ cerr << progname << ": " << Message << "\n";
+ llvm_shutdown();
+ exit(errcode);
+}
+
+static void PrintCommand(const std::vector<const char*> &args) {
+ std::vector<const char*>::const_iterator I = args.begin(), E = args.end();
+ for (; I != E; ++I)
+ if (*I)
+ cout << "'" << *I << "'" << " ";
+ cout << "\n" << std::flush;
+}
+
+/// 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 = '=';
+ }
+
+ return;
+}
+
+/// GenerateBitcode - generates a bitcode file from the module provided
+void GenerateBitcode(Module* M, const std::string& FileName) {
+
+ if (Verbose)
+ cout << "Generating Bitcode To " << FileName << '\n';
+
+ // Create the output file.
+ std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+ std::ios::binary;
+ std::ofstream Out(FileName.c_str(), io_mode);
+ if (!Out.good())
+ PrintAndExit("error opening '" + FileName + "' for writing!");
+
+ // Ensure that the bitcode file gets removed from the disk if we get a
+ // terminating signal.
+ sys::RemoveFileOnSignal(sys::Path(FileName));
+
+ // Write it out
+ WriteBitcodeToFile(M, Out);
+
+ // Close the bitcode file.
+ Out.close();
+}
+
+/// GenerateAssembly - generates a native assembly language source file from the
+/// specified bitcode file.
+///
+/// Inputs:
+/// InputFilename - The name of the input bitcode file.
+/// OutputFilename - The name of the file to generate.
+/// llc - The pathname to use for LLC.
+/// envp - The environment to use when running LLC.
+///
+/// Return non-zero value on error.
+///
+static int GenerateAssembly(const std::string &OutputFilename,
+ const std::string &InputFilename,
+ const sys::Path &llc,
+ std::string &ErrMsg ) {
+ // Run LLC to convert the bitcode 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) {
+ cout << "Generating Assembly With: \n";
+ PrintCommand(args);
+ }
+
+ return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg);
+}
+
+/// GenerateCFile - generates a C source file from the specified bitcode file.
+static int GenerateCFile(const std::string &OutputFile,
+ const std::string &InputFile,
+ const sys::Path &llc,
+ std::string& ErrMsg) {
+ // Run LLC to convert the bitcode 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) {
+ cout << "Generating C Source With: \n";
+ PrintCommand(args);
+ }
+
+ return sys::Program::ExecuteAndWait(llc, &args[0], 0, 0, 0, 0, &ErrMsg);
+}
+
+/// GenerateNative - generates a native object file from the
+/// specified bitcode file.
+///
+/// Inputs:
+/// InputFilename - The name of the input bitcode file.
+/// OutputFilename - The name of the file to generate.
+/// NativeLinkItems - The native libraries, files, code with which to link
+/// LibPaths - The list of directories in which to find libraries.
+/// gcc - The pathname to use for GGC.
+/// envp - A copy of the process's current environment.
+///
+/// Outputs:
+/// None.
+///
+/// Returns non-zero value on error.
+///
+static int GenerateNative(const std::string &OutputFilename,
+ const std::string &InputFilename,
+ const Linker::ItemList &LinkItems,
+ const sys::Path &gcc, char ** const envp,
+ std::string& ErrMsg) {
+ // 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<std::string> 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);
+ args.push_back(InputFilename);
+
+ // Add in the library paths
+ for (unsigned index = 0; index < LibPaths.size(); index++) {
+ args.push_back("-L");
+ args.push_back(LibPaths[index]);
+ }
+
+ // Add the requested options
+ for (unsigned index = 0; index < XLinker.size(); index++) {
+ args.push_back(XLinker[index]);
+ args.push_back(Libraries[index]);
+ }
+
+ // Add in the libraries to link.
+ for (unsigned index = 0; index < LinkItems.size(); index++)
+ if (LinkItems[index].first != "crtend") {
+ if (LinkItems[index].second)
+ args.push_back("-l" + LinkItems[index].first);
+ else
+ args.push_back(LinkItems[index].first);
+ }
+
+
+ // Now that "args" owns all the std::strings for the arguments, call the c_str
+ // method to get the underlying string array. We do this game so that the
+ // std::string array is guaranteed to outlive the const char* array.
+ std::vector<const char *> Args;
+ for (unsigned i = 0, e = args.size(); i != e; ++i)
+ Args.push_back(args[i].c_str());
+ Args.push_back(0);
+
+ if (Verbose) {
+ cout << "Generating Native Executable With:\n";
+ PrintCommand(Args);
+ }
+
+ // Run the compiler to assembly and link together the program.
+ int R = sys::Program::ExecuteAndWait(
+ gcc, &Args[0], (const char**)clean_env, 0, 0, 0, &ErrMsg);
+ delete [] clean_env;
+ return R;
+}
+
+/// EmitShellScript - Output the wrapper file that invokes the JIT on the LLVM
+/// bitcode file for the program.
+static void EmitShellScript(char **argv) {
+ if (Verbose)
+ cout << "Emitting Shell Script\n";
+#if defined(_WIN32) || defined(__CYGWIN__)
+ // Windows doesn't support #!/bin/sh style shell scripts in .exe files. To
+ // support windows systems, we copy the llvm-stub.exe executable from the
+ // build tree to the destination file.
+ std::string ErrMsg;
+ sys::Path llvmstub = FindExecutable("llvm-stub.exe", argv[0]);
+ if (llvmstub.isEmpty())
+ PrintAndExit("Could not find llvm-stub.exe executable!");
+
+ if (0 != sys::CopyFile(sys::Path(OutputFilename), llvmstub, &ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ return;
+#endif
+
+ // Output the script to start the program...
+ std::ofstream Out2(OutputFilename.c_str());
+ if (!Out2.good())
+ PrintAndExit("error opening '" + OutputFilename + "' for writing!");
+
+ Out2 << "#!/bin/sh\n";
+ // Allow user to setenv LLVMINTERP if lli is not in their PATH.
+ Out2 << "lli=${LLVMINTERP-lli}\n";
+ Out2 << "exec $lli \\\n";
+ // gcc accepts -l<lib> and implicitly searches /lib and /usr/lib.
+ LibPaths.push_back("/lib");
+ LibPaths.push_back("/usr/lib");
+ LibPaths.push_back("/usr/X11R6/lib");
+ // We don't need to link in libc! In fact, /usr/lib/libc.so may not be a
+ // shared object at all! See RH 8: plain text.
+ std::vector<std::string>::iterator libc =
+ std::find(Libraries.begin(), Libraries.end(), "c");
+ if (libc != Libraries.end()) Libraries.erase(libc);
+ // List all the shared object (native) libraries this executable will need
+ // on the command line, so that we don't have to do this manually!
+ for (std::vector<std::string>::iterator i = Libraries.begin(),
+ e = Libraries.end(); i != e; ++i) {
+ sys::Path FullLibraryPath = sys::Path::FindLibrary(*i);
+ if (!FullLibraryPath.isEmpty() && FullLibraryPath.isDynamicLibrary())
+ Out2 << " -load=" << FullLibraryPath.toString() << " \\\n";
+ }
+ Out2 << " $0.bc ${1+\"$@\"}\n";
+ Out2.close();
+}
+
+// BuildLinkItems -- This function generates a LinkItemList for the LinkItems
+// linker function by combining the Files and Libraries in the order they were
+// declared on the command line.
+static void BuildLinkItems(
+ Linker::ItemList& Items,
+ const cl::list<std::string>& Files,
+ const cl::list<std::string>& Libraries) {
+
+ // Build the list of linkage items for LinkItems.
+
+ cl::list<std::string>::const_iterator fileIt = Files.begin();
+ cl::list<std::string>::const_iterator libIt = Libraries.begin();
+
+ int libPos = -1, filePos = -1;
+ while ( libIt != Libraries.end() || fileIt != Files.end() ) {
+ if (libIt != Libraries.end())
+ libPos = Libraries.getPosition(libIt - Libraries.begin());
+ else
+ libPos = -1;
+ if (fileIt != Files.end())
+ filePos = Files.getPosition(fileIt - Files.begin());
+ else
+ filePos = -1;
+
+ if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
+ // Add a source file
+ Items.push_back(std::make_pair(*fileIt++, false));
+ } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
+ // Add a library
+ Items.push_back(std::make_pair(*libIt++, true));
+ }
+ }
+}
+
+// Rightly this should go in a header file but it just seems such a waste.
+namespace llvm {
+extern void Optimize(Module*);
+}
+
+int main(int argc, char **argv, char **envp) {
+ llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
+ try {
+ // Initial global variable above for convenience printing of program name.
+ progname = sys::Path(argv[0]).getBasename();
+
+ // Parse the command line options
+ cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
+ sys::PrintStackTraceOnErrorSignal();
+
+ // Construct a Linker (now that Verbose is set)
+ Linker TheLinker(progname, OutputFilename, Verbose);
+
+ // Keep track of the native link items (versus the bitcode items)
+ Linker::ItemList NativeLinkItems;
+
+ // Add library paths to the linker
+ TheLinker.addPaths(LibPaths);
+ TheLinker.addSystemPaths();
+
+ // Remove any consecutive duplicates of the same library...
+ Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
+ Libraries.end());
+
+ if (LinkAsLibrary) {
+ std::vector<sys::Path> Files;
+ for (unsigned i = 0; i < InputFilenames.size(); ++i )
+ Files.push_back(sys::Path(InputFilenames[i]));
+ if (TheLinker.LinkInFiles(Files))
+ return 1; // Error already printed
+
+ // The libraries aren't linked in but are noted as "dependent" in the
+ // module.
+ for (cl::list<std::string>::const_iterator I = Libraries.begin(),
+ E = Libraries.end(); I != E ; ++I) {
+ TheLinker.getModule()->addLibrary(*I);
+ }
+ } else {
+ // Build a list of the items from our command line
+ Linker::ItemList Items;
+ BuildLinkItems(Items, InputFilenames, Libraries);
+
+ // Link all the items together
+ if (TheLinker.LinkInItems(Items, NativeLinkItems) )
+ return 1; // Error already printed
+ }
+
+ std::auto_ptr<Module> Composite(TheLinker.releaseModule());
+
+ // Optimize the module
+ Optimize(Composite.get());
+
+ // Generate the bitcode for the optimized module.
+ std::string RealBitcodeOutput = OutputFilename;
+ if (!LinkAsLibrary) RealBitcodeOutput += ".bc";
+ GenerateBitcode(Composite.get(), RealBitcodeOutput);
+
+ // 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 run a post-link optimization, run it now.
+ if (!PostLinkOpts.empty()) {
+ std::vector<std::string> opts = PostLinkOpts;
+ for (std::vector<std::string>::iterator I = opts.begin(),
+ E = opts.end(); I != E; ++I) {
+ sys::Path prog(*I);
+ if (!prog.canExecute()) {
+ prog = sys::Program::FindProgramByName(*I);
+ if (prog.isEmpty())
+ PrintAndExit(std::string("Optimization program '") + *I +
+ "' is not found or not executable.");
+ }
+ // Get the program arguments
+ sys::Path tmp_output("opt_result");
+ std::string ErrMsg;
+ if (tmp_output.createTemporaryFileOnDisk(true, &ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ const char* args[4];
+ args[0] = I->c_str();
+ args[1] = RealBitcodeOutput.c_str();
+ args[2] = tmp_output.c_str();
+ args[3] = 0;
+ if (0 == sys::Program::ExecuteAndWait(prog, args, 0,0,0,0, &ErrMsg)) {
+ if (tmp_output.isBitcodeFile() || tmp_output.isBitcodeFile()) {
+ sys::Path target(RealBitcodeOutput);
+ target.eraseFromDisk();
+ if (tmp_output.renamePathOnDisk(target, &ErrMsg))
+ PrintAndExit(ErrMsg, 2);
+ } else
+ PrintAndExit("Post-link optimization output is not bitcode");
+ } else {
+ PrintAndExit(ErrMsg);
+ }
+ }
+ }
+
+ // If the user wants to generate a native executable, compile it from the
+ // bitcode file.
+ //
+ // Otherwise, create a script that will run the bitcode through the JIT.
+ if (Native) {
+ // Name of the Assembly Language output file
+ sys::Path AssemblyFile ( OutputFilename);
+ AssemblyFile.appendSuffix("s");
+
+ // Mark the output files for removal if we get an interrupt.
+ sys::RemoveFileOnSignal(AssemblyFile);
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+ // Determine the locations of the llc and gcc programs.
+ sys::Path llc = FindExecutable("llc", argv[0]);
+ if (llc.isEmpty())
+ PrintAndExit("Failed to find llc");
+
+ sys::Path gcc = FindExecutable("gcc", argv[0]);
+ if (gcc.isEmpty())
+ PrintAndExit("Failed to find gcc");
+
+ // Generate an assembly language file for the bitcode.
+ std::string ErrMsg;
+ if (0 != GenerateAssembly(AssemblyFile.toString(), RealBitcodeOutput,
+ llc, ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ if (0 != GenerateNative(OutputFilename, AssemblyFile.toString(),
+ NativeLinkItems, gcc, envp, ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ // Remove the assembly language file.
+ AssemblyFile.eraseFromDisk();
+ } else if (NativeCBE) {
+ sys::Path CFile (OutputFilename);
+ CFile.appendSuffix("cbe.c");
+
+ // Mark the output files for removal if we get an interrupt.
+ sys::RemoveFileOnSignal(CFile);
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+ // Determine the locations of the llc and gcc programs.
+ sys::Path llc = FindExecutable("llc", argv[0]);
+ if (llc.isEmpty())
+ PrintAndExit("Failed to find llc");
+
+ sys::Path gcc = FindExecutable("gcc", argv[0]);
+ if (gcc.isEmpty())
+ PrintAndExit("Failed to find gcc");
+
+ // Generate an assembly language file for the bitcode.
+ std::string ErrMsg;
+ if (0 != GenerateCFile(
+ CFile.toString(), RealBitcodeOutput, llc, ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ if (0 != GenerateNative(OutputFilename, CFile.toString(),
+ NativeLinkItems, gcc, envp, ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ // Remove the assembly language file.
+ CFile.eraseFromDisk();
+
+ } else {
+ EmitShellScript(argv);
+ }
+
+ // Make the script executable...
+ std::string ErrMsg;
+ if (sys::Path(OutputFilename).makeExecutableOnDisk(&ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ // Make the bitcode file readable and directly executable in LLEE as well
+ if (sys::Path(RealBitcodeOutput).makeExecutableOnDisk(&ErrMsg))
+ PrintAndExit(ErrMsg);
+
+ if (sys::Path(RealBitcodeOutput).makeReadableOnDisk(&ErrMsg))
+ PrintAndExit(ErrMsg);
+ }
+ } catch (const std::string& msg) {
+ PrintAndExit(msg,2);
+ } catch (...) {
+ PrintAndExit("Unexpected unknown exception occurred.", 2);
+ }
+
+ // Graceful exit
+ return 0;
+}