_section: Assembler @<cli-asm>

The assembler Command-Line utility allows you to assemble the
[Ethers ASM Dialect](asm-dialect) into deployable EVM bytecode
and disassemle EVM bytecode into human-readable mnemonics.


_subsection: Help

_code: asm-help.txt


_subsection: Example Input Files

_definition: **SimpleStore.asm**

_code: asm-simplestore-asm.txt

_definition: **SimpleStore.bin**

_code: asm-simplestore-bin.txt

_note: Note: Bytecode File Syntax
A bin file may be made up of multiple blocks of bytecode, each may
optionally begin with a ``0x`` prefix, all of which **must** be of
even length (since bytes are required, with 2 nibbles per byte)

All whitespace is ignored.

_subsection: Assembler Examples

The assembler converts an [Ethers ASM Dialect](asm-dialect) into
bytecode by running multiple passes of an assemble stage, each pass
more closely approximating the final result.

This allows small portions of the bytecode to be massaged and tweaked
until the bytecode stablizes. This allows for more compact jump
destinations and for code to be include more advanced meta-programming
techniques.

_code: asm-examples-assemble.txt

_heading: Options

_definition: **-\-define KEY=VALUE** //or// **-\-define FLAG**
This allows key/value pairs (where the value is a string) and
flags (which the value is ``true``) to be passed along to the
assembler, which can be accessed in
[Scripting Blocks](asm-dialect-scripting), such as ``{{= defined.someKey }}``.

_definition: **-\-ignore-warnings**
By default any warning will be treated like an error. This enabled
by-passing warnings.

_definition: **-\-pic**
When a program is assembled, the labels are usually given as an
absolute byte position, which can be jumped to for loops and
control flow. This means that a program must be installed at a specific
location.

Byt specifying the **Position Independent Code** flag, code
will be generated in a way such that all offsets are relative, allowing
the program to be moved without any impact to its logic.

This does incur an additional gsas cost of 8 gas per offset access though.

_definition: **-\-target LABEL**
All programs have a root scope named ``_`` which is by default
assembled. This option allows another labelled target (either a
[[asm-dialect-scope]] or a [[asm-dialect-datasegment]] to be
assembled instead. The entire program is still assembled per usual,
so this only impacts which part of the program is output.

_subsection: Disassembler Examples

A disassembled program shows offsets and mnemonics for the given
bytecode. This format may change in the future to be more
human-readable.

_code: asm-examples-disassemble.txt