+++ /dev/null
-//===- 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 "llvm-ld.h"
-#include "llvm/Linker.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/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"
-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"));
-}
-
-/// 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;
-}
-
-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());
-}
-
-/// GenerateBytecode - generates a bytecode file from the specified module.
-///
-/// Inputs:
-/// M - The module for which bytecode should be generated.
-/// Strip - Flags whether symbols should be stripped from the output.
-/// 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, bool Strip, 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("gccld", M));
-
- // Often if the programmer does not specify proper prototypes for the
- // functions they are calling, they end up calling a vararg version of the
- // function that does not get a body filled in (the real function has typed
- // arguments). This pass merges the two functions.
- addPass(Passes, createFunctionResolvingPass());
-
- if (!DisableOptimizations) {
- if (Internalize) {
- // 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());
- }
-
- // 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());
-
- // If the -s command line option was specified, strip the symbols out of the
- // resulting program to make it smaller. -s is a GCC option that we are
- // supporting.
- if (Strip)
- addPass(Passes, createSymbolStrippingPass());
-
- // Propagate constants at call sites into the functions they call.
- addPass(Passes, createIPConstantPropagationPass());
-
- // Remove unused arguments from functions...
- addPass(Passes, createDeadArgEliminationPass());
-
- if (!DisableInline)
- addPass(Passes, createFunctionInliningPass()); // Inline small functions
-
- addPass(Passes, createPruneEHPass()); // Remove dead EH info
- 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());
- }
-
- // Make sure everything is still good.
- Passes.add(createVerifierPass());
-
- // Add the pass that writes bytecode to the output file...
- addPass(Passes, new WriteBytecodePass(Out));
-
- // 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.
-/// envp - The environment to use when running LLC.
-///
-/// Return non-zero value on error.
-///
-int llvm::GenerateAssembly(const std::string &OutputFilename,
- const std::string &InputFilename,
- const std::string &llc,
- char ** const envp) {
- // Run LLC to convert the bytecode file into assembly code.
- const char *cmd[6];
- cmd[0] = llc.c_str();
- cmd[1] = "-f";
- cmd[2] = "-o";
- cmd[3] = OutputFilename.c_str();
- cmd[4] = InputFilename.c_str();
- cmd[5] = 0;
-
- return ExecWait(cmd, envp);
-}
-
-/// GenerateAssembly - generates a native assembly language source file from the
-/// specified bytecode file.
-int llvm::GenerateCFile(const std::string &OutputFile,
- const std::string &InputFile,
- const std::string &llc, char ** const envp) {
- // Run LLC to convert the bytecode file into C.
- const char *cmd[7];
-
- cmd[0] = llc.c_str();
- cmd[1] = "-march=c";
- cmd[2] = "-f";
- cmd[3] = "-o";
- cmd[4] = OutputFile.c_str();
- cmd[5] = InputFile.c_str();
- cmd[6] = 0;
- return ExecWait(cmd, envp);
-}
-
-/// GenerateNative - generates a native assembly language source 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.
-/// 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.
-///
-int llvm::GenerateNative(const std::string &OutputFilename,
- const std::string &InputFilename,
- const std::vector<std::string> &Libraries,
- const std::vector<std::string> &LibPaths,
- const std::string &gcc, char ** const envp) {
- // 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);
-
- std::vector<const char *> cmd;
-
- // 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.
- cmd.push_back(gcc.c_str());
- cmd.push_back("-fno-strict-aliasing");
- cmd.push_back("-O3");
- cmd.push_back("-o");
- cmd.push_back(OutputFilename.c_str());
- cmd.push_back(InputFilename.c_str());
-
- // Adding the library paths creates a problem for native generation. If we
- // include the search paths from llvmgcc, then we'll be telling normal gcc
- // to look inside of llvmgcc's library directories for libraries. This is
- // bad because those libraries hold only bytecode files (not native object
- // files). In the end, we attempt to link the bytecode libgcc into a native
- // program.
-#if 0
- // Add in the library path options.
- for (unsigned index=0; index < LibPaths.size(); index++) {
- cmd.push_back("-L");
- cmd.push_back(LibPaths[index].c_str());
- }
-#endif
-
- // Add in the libraries to link.
- std::vector<std::string> Libs(Libraries);
- for (unsigned index = 0; index < Libs.size(); index++) {
- if (Libs[index] != "crtend") {
- Libs[index] = "-l" + Libs[index];
- cmd.push_back(Libs[index].c_str());
- }
- }
- cmd.push_back(NULL);
-
- // Run the compiler to assembly and link together the program.
- return ExecWait(&(cmd[0]), clean_env);
-}
-
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