Sun, 23 May 2010 01:38:26 -0700
6939207: refactor constant pool index processing
Summary: Factored cleanup of instruction decode which prepares for enhanced ldc semantics.
Reviewed-by: twisti
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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25 # include "incls/_precompiled.incl"
26 # include "incls/_bytecodeStream.cpp.incl"
28 Bytecodes::Code RawBytecodeStream::raw_next_special(Bytecodes::Code code) {
29 assert(!is_last_bytecode(), "should have been checked");
30 // set next bytecode position
31 address bcp = RawBytecodeStream::bcp();
32 address end = method()->code_base() + end_bci();
33 int l = Bytecodes::raw_special_length_at(bcp, end);
34 if (l <= 0 || (_bci + l) > _end_bci) {
35 code = Bytecodes::_illegal;
36 } else {
37 _next_bci += l;
38 assert(_bci < _next_bci, "length must be > 0");
39 // set attributes
40 _is_wide = false;
41 // check for special (uncommon) cases
42 if (code == Bytecodes::_wide) {
43 if (bcp + 1 >= end) {
44 code = Bytecodes::_illegal;
45 } else {
46 code = (Bytecodes::Code)bcp[1];
47 _is_wide = true;
48 }
49 }
50 }
51 _raw_code = code;
52 return code;
53 }
55 #ifdef ASSERT
56 void BaseBytecodeStream::assert_raw_index_size(int size) const {
57 if (raw_code() == Bytecodes::_invokedynamic && is_raw()) {
58 // in raw mode, pretend indy is "bJJ__"
59 assert(size == 2, "raw invokedynamic instruction has 2-byte index only");
60 } else {
61 bytecode()->assert_index_size(size, raw_code(), is_wide());
62 }
63 }
65 void BaseBytecodeStream::assert_raw_stream(bool want_raw) const {
66 if (want_raw) {
67 assert( is_raw(), "this function only works on raw streams");
68 } else {
69 assert(!is_raw(), "this function only works on non-raw streams");
70 }
71 }
72 #endif //ASSERT