Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 296 insertions, 0 deletions

diff --git a/lib/Support/Path.cpp b/lib/Support/Path.cpp
new file mode 100644
index 0000000..394e013
--- /dev/null
+++ b/lib/Support/Path.cpp
@@ -0,0 +1,296 @@
+//===-- Path.cpp - Implement OS Path Concept --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This header file implements the operating system Path concept.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Path.h"
+#include "llvm/Config/config.h"
+#include <cassert>
+#include <cstring>
+#include <ostream>
+using namespace llvm;
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//===          independent code.
+//===----------------------------------------------------------------------===//
+
+bool Path::operator==(const Path &that) const {
+  return path == that.path;
+}
+
+bool Path::operator<(const Path& that) const {
+  return path < that.path;
+}
+
+Path
+Path::GetLLVMConfigDir() {
+  Path result;
+#ifdef LLVM_ETCDIR
+  if (result.set(LLVM_ETCDIR))
+    return result;
+#endif
+  return GetLLVMDefaultConfigDir();
+}
+
+LLVMFileType
+sys::IdentifyFileType(const char *magic, unsigned length) {
+  assert(magic && "Invalid magic number string");
+  assert(length >=4 && "Invalid magic number length");
+  switch ((unsigned char)magic[0]) {
+    case 0xDE:  // 0x0B17C0DE = BC wraper
+      if (magic[1] == (char)0xC0 && magic[2] == (char)0x17 &&
+          magic[3] == (char)0x0B)
+        return Bitcode_FileType;
+      break;
+    case 'B':
+      if (magic[1] == 'C' && magic[2] == (char)0xC0 && magic[3] == (char)0xDE)
+        return Bitcode_FileType;
+      break;
+    case '!':
+      if (length >= 8)
+        if (memcmp(magic,"!<arch>\n",8) == 0)
+          return Archive_FileType;
+      break;
+
+    case '\177':
+      if (magic[1] == 'E' && magic[2] == 'L' && magic[3] == 'F') {
+        if (length >= 18 && magic[17] == 0)
+          switch (magic[16]) {
+            default: break;
+            case 1: return ELF_Relocatable_FileType;
+            case 2: return ELF_Executable_FileType;
+            case 3: return ELF_SharedObject_FileType;
+            case 4: return ELF_Core_FileType;
+          }
+      }
+      break;
+
+    case 0xCA:
+      if (magic[1] == char(0xFE) && magic[2] == char(0xBA) &&
+          magic[3] == char(0xBE)) {
+        // This is complicated by an overlap with Java class files.
+        // See the Mach-O section in /usr/share/file/magic for details.
+        if (length >= 8 && magic[7] < 43)
+          // FIXME: Universal Binary of any type.
+          return Mach_O_DynamicallyLinkedSharedLib_FileType;
+      }
+      break;
+
+    case 0xFE:
+    case 0xCE: {
+      uint16_t type = 0;
+      if (magic[0] == char(0xFE) && magic[1] == char(0xED) &&
+          magic[2] == char(0xFA) && magic[3] == char(0xCE)) {
+        /* Native endian */
+        if (length >= 16) type = magic[14] << 8 | magic[15];
+      } else if (magic[0] == char(0xCE) && magic[1] == char(0xFA) &&
+                 magic[2] == char(0xED) && magic[3] == char(0xFE)) {
+        /* Reverse endian */
+        if (length >= 14) type = magic[13] << 8 | magic[12];
+      }
+      switch (type) {
+        default: break;
+        case 1: return Mach_O_Object_FileType;
+        case 2: return Mach_O_Executable_FileType;
+        case 3: return Mach_O_FixedVirtualMemorySharedLib_FileType;
+        case 4: return Mach_O_Core_FileType;
+        case 5: return Mach_O_PreloadExecutable_FileType;
+        case 6: return Mach_O_DynamicallyLinkedSharedLib_FileType;
+        case 7: return Mach_O_DynamicLinker_FileType;
+        case 8: return Mach_O_Bundle_FileType;
+        case 9: return Mach_O_DynamicallyLinkedSharedLibStub_FileType;
+        case 10: break; // FIXME: MH_DSYM companion file with only debug.
+      }
+      break;
+    }
+    case 0xF0: // PowerPC Windows
+    case 0x83: // Alpha 32-bit
+    case 0x84: // Alpha 64-bit
+    case 0x66: // MPS R4000 Windows
+    case 0x50: // mc68K
+    case 0x4c: // 80386 Windows
+      if (magic[1] == 0x01)
+        return COFF_FileType;
+
+    case 0x90: // PA-RISC Windows
+    case 0x68: // mc68K Windows
+      if (magic[1] == 0x02)
+        return COFF_FileType;
+      break;
+    case 0x64: // x86-64 Windows.
+      if (magic[1] == char(0x86))
+        return COFF_FileType;
+      break;
+
+    default:
+      break;
+  }
+  return Unknown_FileType;
+}
+
+bool
+Path::isArchive() const {
+  return hasMagicNumber("!<arch>\012");
+}
+
+bool
+Path::isDynamicLibrary() const {
+  std::string Magic;
+  if (getMagicNumber(Magic, 64))
+    switch (IdentifyFileType(Magic.c_str(),
+                             static_cast<unsigned>(Magic.length()))) {
+      default: return false;
+      case Mach_O_FixedVirtualMemorySharedLib_FileType:
+      case Mach_O_DynamicallyLinkedSharedLib_FileType:
+      case Mach_O_DynamicallyLinkedSharedLibStub_FileType:
+      case ELF_SharedObject_FileType:
+      case COFF_FileType:  return true;
+    }
+
+  return false;
+}
+
+bool
+Path::isObjectFile() const {
+  std::string Magic;
+  if (getMagicNumber(Magic, 64))
+    if (IdentifyFileType(Magic.c_str(),
+                         static_cast<unsigned>(Magic.length()))
+        != Unknown_FileType) {
+      // Everything in LLVMFileType is currently an object file.
+      return true;
+    }
+
+  return false;
+}
+
+Path
+Path::FindLibrary(std::string& name) {
+  std::vector<sys::Path> LibPaths;
+  GetSystemLibraryPaths(LibPaths);
+  for (unsigned i = 0; i < LibPaths.size(); ++i) {
+    sys::Path FullPath(LibPaths[i]);
+    FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT);
+    if (FullPath.isDynamicLibrary())
+      return FullPath;
+    FullPath.eraseSuffix();
+    FullPath.appendSuffix("a");
+    if (FullPath.isArchive())
+      return FullPath;
+  }
+  return sys::Path();
+}
+
+StringRef Path::GetDLLSuffix() {
+  return &(LTDL_SHLIB_EXT[1]);
+}
+
+bool
+Path::appendSuffix(StringRef suffix) {
+  if (!suffix.empty()) {
+    std::string save(path);
+    path.append(".");
+    path.append(suffix);
+    if (!isValid()) {
+      path = save;
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool
+Path::isBitcodeFile() const {
+  std::string actualMagic;
+  if (!getMagicNumber(actualMagic, 4))
+    return false;
+  LLVMFileType FT =
+    IdentifyFileType(actualMagic.c_str(),
+                     static_cast<unsigned>(actualMagic.length()));
+  return FT == Bitcode_FileType;
+}
+
+bool Path::hasMagicNumber(StringRef Magic) const {
+  std::string actualMagic;
+  if (getMagicNumber(actualMagic, static_cast<unsigned>(Magic.size())))
+    return Magic == actualMagic;
+  return false;
+}
+
+static void getPathList(const char*path, std::vector<Path>& Paths) {
+  const char* at = path;
+  const char* delim = strchr(at, PathSeparator);
+  Path tmpPath;
+  while (delim != 0) {
+    std::string tmp(at, size_t(delim-at));
+    if (tmpPath.set(tmp))
+      if (tmpPath.canRead())
+        Paths.push_back(tmpPath);
+    at = delim + 1;
+    delim = strchr(at, PathSeparator);
+  }
+
+  if (*at != 0)
+    if (tmpPath.set(std::string(at)))
+      if (tmpPath.canRead())
+        Paths.push_back(tmpPath);
+}
+
+static StringRef getDirnameCharSep(StringRef path, const char *Sep) {
+  assert(Sep[0] != '\0' && Sep[1] == '\0' &&
+         "Sep must be a 1-character string literal.");
+  if (path.empty())
+    return ".";
+
+  // If the path is all slashes, return a single slash.
+  // Otherwise, remove all trailing slashes.
+
+  signed pos = static_cast<signed>(path.size()) - 1;
+
+  while (pos >= 0 && path[pos] == Sep[0])
+    --pos;
+
+  if (pos < 0)
+    return path[0] == Sep[0] ? Sep : ".";
+
+  // Any slashes left?
+  signed i = 0;
+
+  while (i < pos && path[i] != Sep[0])
+    ++i;
+
+  if (i == pos) // No slashes?  Return "."
+    return ".";
+
+  // There is at least one slash left.  Remove all trailing non-slashes.
+  while (pos >= 0 && path[pos] != Sep[0])
+    --pos;
+
+  // Remove any trailing slashes.
+  while (pos >= 0 && path[pos] == Sep[0])
+    --pos;
+
+  if (pos < 0)
+    return path[0] == Sep[0] ? Sep : ".";
+
+  return path.substr(0, pos+1);
+}
+
+// Include the truly platform-specific parts of this class.
+#if defined(LLVM_ON_UNIX)
+#include "Unix/Path.inc"
+#endif
+#if defined(LLVM_ON_WIN32)
+#include "Windows/Path.inc"
+#endif