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View Code? Open in Web Editor NEWA Java decompiler.
License: GNU General Public License v2.0
A Java decompiler.
License: GNU General Public License v2.0
Opcode dcmpg and dcmpl requires their operands undergo value set conversion.
Please note that:
The floating-point types are float and double, which are conceptually associated
with the single-precision 32-bit and double-precision 64-bit format IEEE 754
values and operations as specified in IEEE Standard for Binary Floating-Point
Arithmetic, ANSI/IEEE Standard 754-1985 (IEEE, New York).
This should not be a problem because both Java and C/C++ applies IEEE-754 specification.
References:
[1] §2.8.3 Value Set Conversion
[2] §4.2.3. Floating-Point Types, Formats, and Values
[3] (Chinese) Intro about IEEE-754, IEEE-754R and IEEE-854
Given example
if (i > 5)
check();
else
note();
return 36;
javac
will generates the following code:
0: iload_0
1: iconst_5
2: if_icmple 11
5: invokestatic #2
8: goto 15
11: invokestatic #3
14: pop
15: bipush 36
17: ireturn
Some opcodes requires u2
( = unsigned short ) or u4
( = unsigned int ) data type!
Meanwhile, wide opcode is also a troublemaker!
This note will remain open until
feature-decompile
branch is completed.
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