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Throw better error messages, by calling strerror(errno) when we

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get an error inside the bytecode reader.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10415 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Brian Gaeke 2003-12-12 00:47:44 +00:00
parent 3f6e798a14
commit 27b40bcc9c
1 changed files with 9 additions and 4 deletions
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13
lib/Bytecode/Reader/ReaderWrappers.cpp
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@ -19,6 +19,7 @@
#include "Support/StringExtras.h"
#include "Config/fcntl.h"
#include <sys/stat.h>
#include <cerrno>
#include "Config/unistd.h"
#include "Config/sys/mman.h"
using namespace llvm;
@ -57,22 +58,26 @@ namespace {
};
}
static std::string ErrnoMessage (int savedErrNum, std::string descr) {
return ::strerror(savedErrNum) + std::string(", while trying to ") + descr;
}
BytecodeFileReader::BytecodeFileReader(const std::string &Filename) {
FDHandle FD = open(Filename.c_str(), O_RDONLY);
if (FD == -1)
throw std::string("Error opening file!");
throw ErrnoMessage(errno, "open '" + Filename + "'");
// 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!");
throw ErrnoMessage(errno, "stat '" + Filename + "'");
// mmap in the file all at once...
Length = StatBuf.st_size;
Buffer = (unsigned char*)mmap(0, Length, PROT_READ, MAP_PRIVATE, FD, 0);
if (Buffer == (unsigned char*)MAP_FAILED)
throw std::string("Error mmapping file!");
throw ErrnoMessage(errno, "map '" + Filename + "' into memory");
try {
// Parse the bytecode we mmapped in
@ -167,7 +172,7 @@ BytecodeStdinReader::BytecodeStdinReader() {
// 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!");
throw ErrnoMessage(errno, "read from standard input");
FileData.insert(FileData.end(), Buffer, Buffer+BlockSize);
}