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Add support for compressed bytecode

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17535 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2004-11-06 23:17:23 +00:00
parent 2334e6d908
commit 17f52c5c46
5 changed files with 138 additions and 27 deletions
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43
lib/Bytecode/Reader/Reader.cpp
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@ -24,6 +24,7 @@
#include "llvm/SymbolTable.h"
#include "llvm/Bytecode/Format.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/Compressor.h"
#include "llvm/ADT/StringExtras.h"
#include <sstream>
#include <algorithm>
@ -2152,6 +2153,22 @@ void BytecodeReader::ParseModule() {
error("Function declared, but bytecode stream ended before definition");
}
static unsigned GetUncompressionBuffer(char*&buff, unsigned& sz, void* ctxt){
BytecodeReader::BufferInfo* bi =
reinterpret_cast<BytecodeReader::BufferInfo*>(ctxt);
unsigned new_size = bi->size * 2;
if (bi->buff == 0 ) {
buff = bi->buff = (char*) malloc(new_size);
sz = new_size;
} else {
bi->buff = (char*) ::realloc(bi->buff, new_size);
buff = bi->buff + bi->size;
sz = bi->size;
}
bi->size = new_size;
return (bi->buff == 0 ? 1 : 0);
}
/// This function completely parses a bytecode buffer given by the \p Buf
/// and \p Length parameters.
void BytecodeReader::ParseBytecode(BufPtr Buf, unsigned Length,
@ -2167,9 +2184,25 @@ void BytecodeReader::ParseBytecode(BufPtr Buf, unsigned Length,
if (Handler) Handler->handleStart(TheModule, Length);
// Read and check signature...
unsigned Sig = read_uint();
if (Sig != ('l' | ('l' << 8) | ('v' << 16) | ('m' << 24))) {
error("Invalid bytecode signature: " + utostr(Sig));
bool compressed =
(Buf[0] == 0xEC && Buf[1] == 0xEC && Buf[2] == 0xF6 && Buf[3] == 0xED);
if (compressed) {
bi.size = Length * 2;;
// Bytecode is compressed, have to decompress it first.
unsigned uncompressedLength = Compressor::decompress((char*)Buf+4,Length-4,
GetUncompressionBuffer, (void*) &bi);
At = MemStart = BlockStart = Buf = (BufPtr) bi.buff;
MemEnd = BlockEnd = Buf + uncompressedLength;
} else {
if (!(Buf[0] == 'l' && Buf[1] == 'l' && Buf[2] == 'v' && Buf[3] == 'm'))
error("Invalid bytecode signature: " +
utohexstr(Buf[0]) + utohexstr(Buf[1]) + utohexstr(Buf[2]) +
utohexstr(Buf[3]));
else
At += 4; // skip the bytes
}
// Tell the handler we're starting a module
@ -2215,6 +2248,8 @@ void BytecodeReader::ParseBytecode(BufPtr Buf, unsigned Length,
freeState();
delete TheModule;
TheModule = 0;
if (bi.buff != 0 )
::free(bi.buff);
throw;
} catch (...) {
std::string msg("Unknown Exception Occurred");
@ -2222,6 +2257,8 @@ void BytecodeReader::ParseBytecode(BufPtr Buf, unsigned Length,
freeState();
delete TheModule;
TheModule = 0;
if (bi.buff != 0 )
::free(bi.buff);
throw msg;
}
}