* Cleaned up code:
- no more passing around a string pointer to set errors
- no more returning booleans and checking for errors, we use C++ exceptions
* Broke functionality into 2 new classes, one reads from file, one from a stream
* Implemented lazy function streaming - the parser can read in a function at-a-time
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8671 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/ReaderWrappers.cpp b/lib/Bytecode/Reader/ReaderWrappers.cpp
new file mode 100644
index 0000000..218c694
--- /dev/null
+++ b/lib/Bytecode/Reader/ReaderWrappers.cpp
@@ -0,0 +1,170 @@
+#include "ReaderInternals.h"
+#include "Support/StringExtras.h"
+#include "Config/fcntl.h"
+#include "Config/unistd.h"
+#include "Config/sys/mman.h"
+
+#define CHECK_ALIGN32(begin,end) \
+ if (align32(begin,end)) \
+ throw std::string("Alignment error: ReaderWrappers.cpp:" + \
+ utostr((unsigned)__LINE__));
+
+namespace {
+
+ /// BytecodeFileReader - parses a bytecode file from a file
+ ///
+ class BytecodeFileReader : public BytecodeParser {
+ private:
+ unsigned char *Buffer;
+ int Length;
+
+ BytecodeFileReader(const BytecodeFileReader&); // Do not implement
+ void operator=(BytecodeFileReader &BFR); // Do not implement
+
+ public:
+ BytecodeFileReader(const std::string &Filename);
+ ~BytecodeFileReader();
+
+ };
+
+ /// BytecodeStdinReader - parses a bytecode file from stdin
+ ///
+ class BytecodeStdinReader : public BytecodeParser {
+ private:
+ std::vector<unsigned char> FileData;
+ unsigned char *FileBuf;
+
+ BytecodeStdinReader(const BytecodeStdinReader&); // Do not implement
+ void operator=(BytecodeStdinReader &BFR); // Do not implement
+
+ public:
+ BytecodeStdinReader();
+ ~BytecodeStdinReader();
+ };
+
+ /// FDHandle - Simple handle class to make sure a file descriptor gets closed
+ /// when the object is destroyed.
+ ///
+ class FDHandle {
+ int FD;
+ public:
+ FDHandle(int fd) : FD(fd) {}
+ operator int() const { return FD; }
+ ~FDHandle() {
+ if (FD != -1) close(FD);
+ }
+ };
+}
+
+BytecodeFileReader::BytecodeFileReader(const std::string &Filename) {
+ FDHandle FD = open(Filename.c_str(), O_RDONLY);
+ if (FD == -1)
+ throw std::string("Error opening file!");
+
+ // Stat the file to get its length...
+ struct stat StatBuf;
+ if (fstat(FD, &StatBuf) == -1 || StatBuf.st_size == 0)
+ throw std::string("Error stat'ing file!");
+
+ // mmap in the file all at once...
+ Length = StatBuf.st_size;
+ unsigned char *Buffer = (unsigned char*)mmap(0, Length, PROT_READ,
+ MAP_PRIVATE, FD, 0);
+ if (Buffer == (unsigned char*)MAP_FAILED)
+ throw std::string("Error mmapping file!");
+
+ // Parse the bytecode we mmapped in
+ ParseBytecode(Buffer, Length, Filename);
+}
+
+BytecodeFileReader::~BytecodeFileReader() {
+ // Unmmap the bytecode...
+ munmap((char*)Buffer, Length);
+}
+
+
+#define ALIGN_PTRS 0
+
+BytecodeStdinReader::BytecodeStdinReader() {
+ int BlockSize;
+ unsigned char Buffer[4096*4];
+
+ // Read in all of the data from stdin, we cannot mmap stdin...
+ while ((BlockSize = read(0 /*stdin*/, Buffer, 4096*4))) {
+ if (BlockSize == -1)
+ throw std::string("Error reading from stdin!");
+
+ FileData.insert(FileData.end(), Buffer, Buffer+BlockSize);
+ }
+
+ if (FileData.empty())
+ throw std::string("Standard Input empty!");
+
+#if ALIGN_PTRS
+ FileBuf = (unsigned char*)mmap(0, FileData.size(), PROT_READ|PROT_WRITE,
+ MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+ assert((Buf != (unsigned char*)-1) && "mmap returned error!");
+ memcpy(Buf, &FileData[0], FileData.size());
+#else
+ FileBuf = &FileData[0];
+#endif
+
+#if 0
+ // Allocate a new buffer to hold the bytecode...
+ unsigned char *ParseBegin=0;
+ unsigned Offset=0;
+ if ((intptr_t)Buffer & 3) {
+ delete [] Buffer;
+ Buffer = new unsigned char[Length+4];
+ Offset = 4-((intptr_t)Buffer & 3); // Make sure it's aligned
+ }
+ memcpy(Buffer+Offset, Buf, Length); // Copy it over
+ ParseBegin = Buffer+Offset;
+#endif
+
+ ParseBytecode(FileBuf, FileData.size(), "<stdin>");
+}
+
+BytecodeStdinReader::~BytecodeStdinReader() {
+#if ALIGN_PTRS
+ munmap((char*)FileBuf, FileData.size()); // Free mmap'd data area
+#endif
+}
+
+///
+///
+AbstractModuleProvider*
+getBytecodeBufferModuleProvider(const unsigned char *Buffer, unsigned Length,
+ const std::string &ModuleID) {
+ CHECK_ALIGN32(Buffer, Buffer+Length);
+ BytecodeParser *Parser = new BytecodeParser();
+ Parser->ParseBytecode(Buffer, Length, ModuleID);
+ return Parser;
+}
+
+Module *ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
+ const std::string &ModuleID, std::string *ErrorStr){
+ AbstractModuleProvider *AMP =
+ getBytecodeBufferModuleProvider(Buffer, Length, ModuleID);
+ Module *M = AMP->releaseModule();
+ delete AMP;
+ return M;
+}
+
+
+/// Parse and return a class file...
+///
+AbstractModuleProvider*
+getBytecodeModuleProvider(const std::string &Filename) {
+ if (Filename != std::string("-")) // Read from a file...
+ return new BytecodeFileReader(Filename);
+ else // Read from stdin
+ return new BytecodeStdinReader();
+}
+
+Module *ParseBytecodeFile(const std::string &Filename, std::string *ErrorStr) {
+ AbstractModuleProvider *AMP = getBytecodeModuleProvider(Filename);
+ Module *M = AMP->releaseModule();
+ delete AMP;
+ return M;
+}