#include "gccld.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/Transforms/Utils/Linker.h"
-#include "Support/SystemUtils.h"
+#include "llvm/Support/Linker.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.
///
/// Internalize - Flags whether all symbols should be marked internal.
/// Out - Pointer to file stream to which to write the output.
///
-/// Outputs:
-/// None.
-///
/// Returns non-zero value on error.
///
-int
-GenerateBytecode (Module *M, bool Strip, bool Internalize, std::ostream *Out) {
+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;
- // Add an appropriate TargetData instance for this module...
- Passes.add(new TargetData("gccld", M));
-
- // Linking modules together can lead to duplicated global constants, only keep
- // one copy of each constant...
- Passes.add(createConstantMergePass());
+ if (Verify) Passes.add(createVerifierPass());
- // 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)
- Passes.add(createSymbolStrippingPass());
+ // 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.
- Passes.add(createFunctionResolvingPass());
+ addPass(Passes, createFunctionResolvingPass());
- 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.
- Passes.add(createInternalizePass());
- }
+ 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, 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());
- // Propagate constants at call sites into the functions they call.
- Passes.add(createIPConstantPropagationPass());
+ addPass(Passes, createScalarReplAggregatesPass()); // Break up allocas
- // Remove unused arguments from functions...
- Passes.add(createDeadArgEliminationPass());
+ // Run a few AA driven optimizations here and now, to cleanup the code.
+ addPass(Passes, createGlobalsModRefPass()); // IP alias analysis
- // The FuncResolve pass may leave cruft around if functions were prototyped
- // differently than they were defined. Remove this cruft.
- Passes.add(createInstructionCombiningPass());
+ 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
- // Delete basic blocks, which optimization passes may have killed...
- Passes.add(createCFGSimplificationPass());
+ // Cleanup and simplify the code after the scalar optimizations.
+ addPass(Passes, createInstructionCombiningPass());
- // Now that we have optimized the program, discard unreachable functions...
- Passes.add(createGlobalDCEPass());
+ // 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...
- Passes.add(new WriteBytecodePass(Out));
+ addPass(Passes, new WriteBytecodePass(Out));
// Run our queue of passes all at once now, efficiently.
Passes.run(*M);
/// llc - The pathname to use for LLC.
/// envp - The environment to use when running LLC.
///
-/// Outputs:
-/// None.
-///
/// Return non-zero value on error.
///
-int
-GenerateAssembly(const std::string &OutputFilename,
- const std::string &InputFilename,
- const std::string &llc,
- char ** const envp)
-{
+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[8];
-
+ 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] = NULL;
+ 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.
///
///
/// Returns non-zero value on error.
///
-int
-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) {
+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
// 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());
// Add in the libraries to link.
std::vector<std::string> Libs(Libraries);
for (unsigned index = 0; index < Libs.size(); index++) {
- Libs[index] = "-l" + Libs[index];
- cmd.push_back(Libs[index].c_str());
+ 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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