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8152479: Coded byte streams

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Reviewed-by: acorn, mschoene, asmotrak
This commit is contained in:
Harold Seigel 2016-04-06 07:55:32 -04:00 committed by Harold Seigel
parent 86e696a816
commit 99c24f5f1c
2 changed files with 28 additions and 21 deletions
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10
hotspot/src/share/vm/interpreter/bytecodeStream.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -31,12 +31,12 @@ Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
// set next bytecode position
address bcp = RawBytecodeStream::bcp();
address end = method()->code_base() + end_bci();
int l = Bytecodes::raw_special_length_at(bcp, end);
if (l <= 0 || (_bci + l) > _end_bci) {
int len = Bytecodes::raw_special_length_at(bcp, end);
// Very large tableswitch or lookupswitch size can cause _next_bci to overflow.
if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
code = Bytecodes::_illegal;
} else {
_next_bci += l;
assert(_bci < _next_bci, "length must be > 0");
_next_bci += len;
// set attributes
_is_wide = false;
// check for special (uncommon) cases

39
hotspot/src/share/vm/interpreter/bytecodeStream.hpp
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -135,12 +135,15 @@ class RawBytecodeStream: public BaseBytecodeStream {
code = Bytecodes::code_or_bp_at(bcp);
// set next bytecode position
int l = Bytecodes::length_for(code);
if (l > 0 && (_bci + l) <= _end_bci) {
int len = Bytecodes::length_for(code);
if (len > 0 && (_bci <= _end_bci - len)) {
assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch
&& code != Bytecodes::_lookupswitch, "can't be special bytecode");
_is_wide = false;
_next_bci += l;
_next_bci += len;
if (_next_bci <= _bci) { // Check for integer overflow
code = Bytecodes::_illegal;
}
_raw_code = code;
return code;
} else {
@ -189,19 +192,23 @@ class BytecodeStream: public BaseBytecodeStream {
// note that we cannot advance before having the
// tty bytecode otherwise the stepping is wrong!
// (carefull: length_for(...) must be used first!)
int l = Bytecodes::length_for(code);
if (l == 0) l = Bytecodes::length_at(_method(), bcp);
_next_bci += l;
assert(_bci < _next_bci, "length must be > 0");
// set attributes
_is_wide = false;
// check for special (uncommon) cases
if (code == Bytecodes::_wide) {
raw_code = (Bytecodes::Code)bcp[1];
code = raw_code; // wide BCs are always Java-normal
_is_wide = true;
int len = Bytecodes::length_for(code);
if (len == 0) len = Bytecodes::length_at(_method(), bcp);
if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
raw_code = code = Bytecodes::_illegal;
} else {
_next_bci += len;
assert(_bci < _next_bci, "length must be > 0");
// set attributes
_is_wide = false;
// check for special (uncommon) cases
if (code == Bytecodes::_wide) {
raw_code = (Bytecodes::Code)bcp[1];
code = raw_code; // wide BCs are always Java-normal
_is_wide = true;
}
assert(Bytecodes::is_java_code(code), "sanity check");
}
assert(Bytecodes::is_java_code(code), "sanity check");
}
_raw_code = raw_code;
_code = code;