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Please take a look at this question
Decompiled smali code contains things like .line 3 or .line 7.
I cannot understand what .line is supposed to be, please elaborate on the usage.
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Smali/Baksmali is an assembler/disassembler for the dex format used by dalvik, Android's Java VM implementation. The syntax is loosely based on Jasmin's/dedexer's syntax, and supports the full functionality of the dex format (annotations, debug info, line info, etc.)
From the official git¹, “smali/baksmali is an assembler/disassembler for the dex format used by dalvik, Android's Java VM implementation”. The smali code, which is what we wish to modify, can be thought of as an equivalent of assembly code of a C program.
Smali is intended to serve as a basis for further analysis of Android applications and security implementation techniques. Android applications are mainly written in Java. The Java source code is first compiled into a Java Virtual Machine (JVM) bytecode using a standard Java compiler called Javac.
.line n markers are used for debugging and stacktraces. When an exception goes uncaught, or the stacktrace needs to be filled in, the line number is taken from the .line statement. If this were missing, then stacktraces would lack line numbers.
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