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/lib/Linker/LinkItems.cpp b/lib/Linker/LinkItems.cpp
new file mode 100644
index 0000000..3cf1f6b
--- /dev/null
+++ b/lib/Linker/LinkItems.cpp
@@ -0,0 +1,221 @@
+//===- lib/Linker/LinkItems.cpp - Link LLVM objects and libraries ---------===//
+//
+// 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 contains routines to handle linking together LLVM bitcode files,
+// and to handle annoying things like static libraries.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Linker.h"
+#include "llvm/Module.h"
+
+using namespace llvm;
+
+// LinkItems - This function is the main entry point into linking. It takes a
+// list of LinkItem which indicates the order the files should be linked and
+// how each file should be treated (plain file or with library search). The
+// function only links bitcode and produces a result list of items that are
+// native objects.
+bool
+Linker::LinkInItems(const ItemList& Items, ItemList& NativeItems) {
+ // Clear the NativeItems just in case
+ NativeItems.clear();
+
+ // For each linkage item ...
+ for (ItemList::const_iterator I = Items.begin(), E = Items.end();
+ I != E; ++I) {
+ if (I->second) {
+ // Link in the library suggested.
+ bool is_native = false;
+ if (LinkInLibrary(I->first, is_native))
+ return true;
+ if (is_native)
+ NativeItems.push_back(*I);
+ } else {
+ // Link in the file suggested
+ bool is_native = false;
+ if (LinkInFile(sys::Path(I->first), is_native))
+ return true;
+ if (is_native)
+ NativeItems.push_back(*I);
+ }
+ }
+
+ // At this point we have processed all the link items provided to us. Since
+ // we have an aggregated module at this point, the dependent libraries in
+ // that module should also be aggregated with duplicates eliminated. This is
+ // now the time to process the dependent libraries to resolve any remaining
+ // symbols.
+ bool is_native;
+ for (Module::lib_iterator I = Composite->lib_begin(),
+ E = Composite->lib_end(); I != E; ++I) {
+ if(LinkInLibrary(*I, is_native))
+ return true;
+ if (is_native)
+ NativeItems.push_back(std::make_pair(*I, true));
+ }
+
+ return false;
+}
+
+
+/// LinkInLibrary - links one library into the HeadModule.
+///
+bool Linker::LinkInLibrary(const std::string& Lib, bool& is_native) {
+ is_native = false;
+ // Determine where this library lives.
+ sys::Path Pathname = FindLib(Lib);
+ if (Pathname.isEmpty())
+ return warning("Cannot find library '" + Lib + "'");
+
+ // If its an archive, try to link it in
+ std::string Magic;
+ Pathname.getMagicNumber(Magic, 64);
+ switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
+ default: assert(0 && "Bad file type identification");
+ case sys::Unknown_FileType:
+ return warning("Supposed library '" + Lib + "' isn't a library.");
+
+ case sys::Bitcode_FileType:
+ // LLVM ".so" file.
+ if (LinkInFile(Pathname, is_native))
+ return error("Cannot link file '" + Pathname.toString() + "'");
+ break;
+
+ case sys::Archive_FileType:
+ if (LinkInArchive(Pathname, is_native))
+ return error("Cannot link archive '" + Pathname.toString() + "'");
+ break;
+
+ case sys::ELF_Relocatable_FileType:
+ case sys::ELF_SharedObject_FileType:
+ case sys::Mach_O_Object_FileType:
+ case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
+ case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
+ case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
+ case sys::COFF_FileType:
+ is_native = true;
+ break;
+ }
+ return false;
+}
+
+/// LinkLibraries - takes the specified library files and links them into the
+/// main bitcode object file.
+///
+/// Inputs:
+/// Libraries - The list of libraries to link into the module.
+///
+/// Return value:
+/// FALSE - No error.
+/// TRUE - Error.
+///
+bool Linker::LinkInLibraries(const std::vector<std::string> &Libraries) {
+
+ // Process the set of libraries we've been provided.
+ bool is_native = false;
+ for (unsigned i = 0; i < Libraries.size(); ++i)
+ if (LinkInLibrary(Libraries[i], is_native))
+ return true;
+
+ // At this point we have processed all the libraries provided to us. Since
+ // we have an aggregated module at this point, the dependent libraries in
+ // that module should also be aggregated with duplicates eliminated. This is
+ // now the time to process the dependent libraries to resolve any remaining
+ // symbols.
+ const Module::LibraryListType& DepLibs = Composite->getLibraries();
+ for (Module::LibraryListType::const_iterator I = DepLibs.begin(),
+ E = DepLibs.end(); I != E; ++I)
+ if (LinkInLibrary(*I, is_native))
+ return true;
+
+ return false;
+}
+
+/// LinkInFile - opens a bitcode file and links in all objects which
+/// provide symbols that are currently undefined.
+///
+/// Inputs:
+/// File - The pathname of the bitcode file.
+///
+/// Outputs:
+/// ErrorMessage - A C++ string detailing what error occurred, if any.
+///
+/// Return Value:
+/// TRUE - An error occurred.
+/// FALSE - No errors.
+///
+bool Linker::LinkInFile(const sys::Path &File, bool &is_native) {
+ is_native = false;
+ // Make sure we can at least read the file
+ if (!File.canRead())
+ return error("Cannot find linker input '" + File.toString() + "'");
+
+ // If its an archive, try to link it in
+ std::string Magic;
+ File.getMagicNumber(Magic, 64);
+ switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
+ default: assert(0 && "Bad file type identification");
+ case sys::Unknown_FileType:
+ return warning("Supposed object file '" + File.toString() +
+ "' not recognized as such");
+
+ case sys::Archive_FileType:
+ // A user may specify an ar archive without -l, perhaps because it
+ // is not installed as a library. Detect that and link the archive.
+ verbose("Linking archive file '" + File.toString() + "'");
+ if (LinkInArchive(File, is_native))
+ return error("Cannot link archive '" + File.toString() + "'");
+ break;
+
+ case sys::Bitcode_FileType: {
+ verbose("Linking bitcode file '" + File.toString() + "'");
+ std::auto_ptr<Module> M(LoadObject(File));
+ if (M.get() == 0)
+ return error("Cannot load file '" + File.toString() + "'" + Error);
+ if (LinkInModule(M.get()))
+ return error("Cannot link file '" + File.toString() + "'" + Error);
+
+ verbose("Linked in file '" + File.toString() + "'");
+ break;
+ }
+
+ case sys::ELF_Relocatable_FileType:
+ case sys::ELF_SharedObject_FileType:
+ case sys::Mach_O_Object_FileType:
+ case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
+ case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
+ case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
+ case sys::COFF_FileType:
+ is_native = true;
+ break;
+ }
+ return false;
+}
+
+/// LinkFiles - takes a module and a list of files and links them all together.
+/// It locates the file either in the current directory, as its absolute
+/// or relative pathname, or as a file somewhere in LLVM_LIB_SEARCH_PATH.
+///
+/// Inputs:
+/// Files - A vector of sys::Path indicating the LLVM bitcode filenames
+/// to be linked. The names can refer to a mixture of pure LLVM
+/// bitcode files and archive (ar) formatted files.
+///
+/// Return value:
+/// FALSE - No errors.
+/// TRUE - Some error occurred.
+///
+bool Linker::LinkInFiles(const std::vector<sys::Path> &Files) {
+ bool is_native;
+ for (unsigned i = 0; i < Files.size(); ++i)
+ if (LinkInFile(Files[i], is_native))
+ return true;
+ return false;
+}