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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Deprecated. `Opcode` has been renamed to `LineInstruction`."><title>Opcode in gimli::read - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="gimli" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc type"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../gimli/index.html">gimli</a><span class="version">0.28.1</span></h2></div><h2 class="location"><a href="#">Opcode</a></h2><div class="sidebar-elems"><section><h3><a href="#aliased-type">Aliased type</a></h3><h3><a href="#variants">Variants</a></h3><ul class="block variant"><li><a href="#variant.AdvanceLine">AdvanceLine</a></li><li><a href="#variant.AdvancePc">AdvancePc</a></li><li><a href="#variant.ConstAddPc">ConstAddPc</a></li><li><a href="#variant.Copy">Copy</a></li><li><a href="#variant.DefineFile">DefineFile</a></li><li><a href="#variant.EndSequence">EndSequence</a></li><li><a href="#variant.FixedAddPc">FixedAddPc</a></li><li><a href="#variant.NegateStatement">NegateStatement</a></li><li><a href="#variant.SetAddress">SetAddress</a></li><li><a href="#variant.SetBasicBlock">SetBasicBlock</a></li><li><a href="#variant.SetColumn">SetColumn</a></li><li><a href="#variant.SetDiscriminator">SetDiscriminator</a></li><li><a href="#variant.SetEpilogueBegin">SetEpilogueBegin</a></li><li><a href="#variant.SetFile">SetFile</a></li><li><a href="#variant.SetIsa">SetIsa</a></li><li><a href="#variant.SetPrologueEnd">SetPrologueEnd</a></li><li><a href="#variant.Special">Special</a></li><li><a href="#variant.UnknownExtended">UnknownExtended</a></li><li><a href="#variant.UnknownStandard0">UnknownStandard0</a></li><li><a href="#variant.UnknownStandard1">UnknownStandard1</a></li><li><a href="#variant.UnknownStandardN">UnknownStandardN</a></li></ul></section><h2><a href="index.html">In gimli::read</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../gimli/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Type Alias <a href="../index.html">gimli</a>::<wbr><a href="index.html">read</a>::<wbr><a class="type" href="#">Opcode</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/gimli/read/line.rs.html#273">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub type Opcode&lt;R&gt; = <a class="enum" href="enum.LineInstruction.html" title="enum gimli::read::LineInstruction">LineInstruction</a>&lt;R, &lt;R as <a class="trait" href="trait.Reader.html" title="trait gimli::read::Reader">Reader</a>&gt;::<a class="associatedtype" href="trait.Reader.html#associatedtype.Offset" title="type gimli::read::Reader::Offset">Offset</a>&gt;;</code></pre><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated: Opcode has been renamed to LineInstruction, use that instead.</span></div></span><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deprecated. <code>Opcode</code> has been renamed to <code>LineInstruction</code>.</p>
</div></details><h2 id="aliased-type" class="section-header">Aliased Type<a href="#aliased-type" class="anchor">§</a></h2><pre class="rust item-decl"><code>enum Opcode&lt;R&gt; {
<details class="toggle type-contents-toggle"><summary class="hideme"><span>Show 21 variants</span></summary> Special(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u8.html">u8</a>),
Copy,
AdvancePc(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
AdvanceLine(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.i64.html">i64</a>),
SetFile(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
SetColumn(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
NegateStatement,
SetBasicBlock,
ConstAddPc,
FixedAddPc(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u16.html">u16</a>),
SetPrologueEnd,
SetEpilogueBegin,
SetIsa(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
UnknownStandard0(<a class="struct" href="../constants/struct.DwLns.html" title="struct gimli::constants::DwLns">DwLns</a>),
UnknownStandard1(<a class="struct" href="../constants/struct.DwLns.html" title="struct gimli::constants::DwLns">DwLns</a>, <a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
UnknownStandardN(<a class="struct" href="../constants/struct.DwLns.html" title="struct gimli::constants::DwLns">DwLns</a>, R),
EndSequence,
SetAddress(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
DefineFile(<a class="struct" href="struct.FileEntry.html" title="struct gimli::read::FileEntry">FileEntry</a>&lt;R&gt;),
SetDiscriminator(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>),
UnknownExtended(<a class="struct" href="../constants/struct.DwLne.html" title="struct gimli::constants::DwLne">DwLne</a>, R),
</details>}</code></pre><h2 id="variants" class="variants section-header">Variants<a href="#variants" class="anchor">§</a></h2><div class="variants"><section id="variant.Special" class="variant"><a href="#variant.Special" class="anchor">§</a><h3 class="code-header">Special(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u8.html">u8</a>)</h3></section><div class="docblock"><blockquote>
<h6 id="6251-special-opcodes"><a href="#6251-special-opcodes">6.2.5.1 Special Opcodes</a></h6>
<p>Each ubyte special opcode has the following effect on the state machine:</p>
<ol>
<li>
<p>Add a signed integer to the line register.</p>
</li>
<li>
<p>Modify the operation pointer by incrementing the address and
op_index registers as described below.</p>
</li>
<li>
<p>Append a row to the matrix using the current values of the state
machine registers.</p>
</li>
<li>
<p>Set the basic_block register to “false.”</p>
</li>
<li>
<p>Set the prologue_end register to “false.”</p>
</li>
<li>
<p>Set the epilogue_begin register to “false.”</p>
</li>
<li>
<p>Set the discriminator register to 0.</p>
</li>
</ol>
<p>All of the special opcodes do those same seven things; they differ from
one another only in what values they add to the line, address and
op_index registers.</p>
</blockquote>
</div><section id="variant.Copy" class="variant"><a href="#variant.Copy" class="anchor">§</a><h3 class="code-header">Copy</h3></section><div class="docblock"><p>“<a href="enum.LineInstruction.html#variant.Copy" title="variant gimli::read::LineInstruction::Copy"><code>LineInstruction::Copy</code></a> appends a row to the matrix using the current
values of the state machine registers. Then it sets the discriminator
register to 0, and sets the basic_block, prologue_end and epilogue_begin
registers to “false.””</p>
</div><section id="variant.AdvancePc" class="variant"><a href="#variant.AdvancePc" class="anchor">§</a><h3 class="code-header">AdvancePc(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><p>“The DW_LNS_advance_pc opcode takes a single unsigned LEB128 operand as
the operation advance and modifies the address and op_index registers
[the same as <code>LineInstruction::Special</code>]”</p>
</div><section id="variant.AdvanceLine" class="variant"><a href="#variant.AdvanceLine" class="anchor">§</a><h3 class="code-header">AdvanceLine(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.i64.html">i64</a>)</h3></section><div class="docblock"><p>“The DW_LNS_advance_line opcode takes a single signed LEB128 operand and
adds that value to the line register of the state machine.”</p>
</div><section id="variant.SetFile" class="variant"><a href="#variant.SetFile" class="anchor">§</a><h3 class="code-header">SetFile(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><p>“The DW_LNS_set_file opcode takes a single unsigned LEB128 operand and
stores it in the file register of the state machine.”</p>
</div><section id="variant.SetColumn" class="variant"><a href="#variant.SetColumn" class="anchor">§</a><h3 class="code-header">SetColumn(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><p>“The DW_LNS_set_column opcode takes a single unsigned LEB128 operand and
stores it in the column register of the state machine.”</p>
</div><section id="variant.NegateStatement" class="variant"><a href="#variant.NegateStatement" class="anchor">§</a><h3 class="code-header">NegateStatement</h3></section><div class="docblock"><p>“The DW_LNS_negate_stmt opcode takes no operands. It sets the is_stmt
register of the state machine to the logical negation of its current
value.”</p>
</div><section id="variant.SetBasicBlock" class="variant"><a href="#variant.SetBasicBlock" class="anchor">§</a><h3 class="code-header">SetBasicBlock</h3></section><div class="docblock"><p>“The DW_LNS_set_basic_block opcode takes no operands. It sets the
basic_block register of the state machine to “true.””</p>
</div><section id="variant.ConstAddPc" class="variant"><a href="#variant.ConstAddPc" class="anchor">§</a><h3 class="code-header">ConstAddPc</h3></section><div class="docblock"><blockquote>
<p>The DW_LNS_const_add_pc opcode takes no operands. It advances the
address and op_index registers by the increments corresponding to
special opcode 255.</p>
<p>When the line number program needs to advance the address by a small
amount, it can use a single special opcode, which occupies a single
byte. When it needs to advance the address by up to twice the range of
the last special opcode, it can use DW_LNS_const_add_pc followed by a
special opcode, for a total of two bytes. Only if it needs to advance
the address by more than twice that range will it need to use both
DW_LNS_advance_pc and a special opcode, requiring three or more bytes.</p>
</blockquote>
</div><section id="variant.FixedAddPc" class="variant"><a href="#variant.FixedAddPc" class="anchor">§</a><h3 class="code-header">FixedAddPc(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u16.html">u16</a>)</h3></section><div class="docblock"><blockquote>
<p>The DW_LNS_fixed_advance_pc opcode takes a single uhalf (unencoded)
operand and adds it to the address register of the state machine and
sets the op_index register to 0. This is the only standard opcode whose
operand is not a variable length number. It also does not multiply the
operand by the minimum_instruction_length field of the header.</p>
</blockquote>
</div><section id="variant.SetPrologueEnd" class="variant"><a href="#variant.SetPrologueEnd" class="anchor">§</a><h3 class="code-header">SetPrologueEnd</h3></section><div class="docblock"><p>“<a href="enum.LineInstruction.html#variant.SetPrologueEnd" title="variant gimli::read::LineInstruction::SetPrologueEnd"><code>LineInstruction::SetPrologueEnd</code></a> sets the prologue_end register to “true”.”</p>
</div><section id="variant.SetEpilogueBegin" class="variant"><a href="#variant.SetEpilogueBegin" class="anchor">§</a><h3 class="code-header">SetEpilogueBegin</h3></section><div class="docblock"><p>“<a href="enum.LineInstruction.html#variant.SetEpilogueBegin" title="variant gimli::read::LineInstruction::SetEpilogueBegin"><code>LineInstruction::SetEpilogueBegin</code></a> sets the epilogue_begin register to
“true”.”</p>
</div><section id="variant.SetIsa" class="variant"><a href="#variant.SetIsa" class="anchor">§</a><h3 class="code-header">SetIsa(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><p>“The DW_LNS_set_isa opcode takes a single unsigned LEB128 operand and
stores that value in the isa register of the state machine.”</p>
</div><section id="variant.UnknownStandard0" class="variant"><a href="#variant.UnknownStandard0" class="anchor">§</a><h3 class="code-header">UnknownStandard0(<a class="struct" href="../constants/struct.DwLns.html" title="struct gimli::constants::DwLns">DwLns</a>)</h3></section><div class="docblock"><p>An unknown standard opcode with zero operands.</p>
</div><section id="variant.UnknownStandard1" class="variant"><a href="#variant.UnknownStandard1" class="anchor">§</a><h3 class="code-header">UnknownStandard1(<a class="struct" href="../constants/struct.DwLns.html" title="struct gimli::constants::DwLns">DwLns</a>, <a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><p>An unknown standard opcode with one operand.</p>
</div><section id="variant.UnknownStandardN" class="variant"><a href="#variant.UnknownStandardN" class="anchor">§</a><h3 class="code-header">UnknownStandardN(<a class="struct" href="../constants/struct.DwLns.html" title="struct gimli::constants::DwLns">DwLns</a>, R)</h3></section><div class="docblock"><p>An unknown standard opcode with multiple operands.</p>
</div><section id="variant.EndSequence" class="variant"><a href="#variant.EndSequence" class="anchor">§</a><h3 class="code-header">EndSequence</h3></section><div class="docblock"><blockquote>
<p><a href="enum.LineInstruction.html#variant.EndSequence" title="variant gimli::read::LineInstruction::EndSequence"><code>LineInstruction::EndSequence</code></a> sets the end_sequence register of the state
machine to “true” and appends a row to the matrix using the current
values of the state-machine registers. Then it resets the registers to
the initial values specified above (see Section 6.2.2). Every line
number program sequence must end with a DW_LNE_end_sequence instruction
which creates a row whose address is that of the byte after the last
target machine instruction of the sequence.</p>
</blockquote>
</div><section id="variant.SetAddress" class="variant"><a href="#variant.SetAddress" class="anchor">§</a><h3 class="code-header">SetAddress(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><blockquote>
<p>The DW_LNE_set_address opcode takes a single relocatable address as an
operand. The size of the operand is the size of an address on the target
machine. It sets the address register to the value given by the
relocatable address and sets the op_index register to 0.</p>
<p>All of the other line number program opcodes that affect the address
register add a delta to it. This instruction stores a relocatable value
into it instead.</p>
</blockquote>
</div><section id="variant.DefineFile" class="variant"><a href="#variant.DefineFile" class="anchor">§</a><h3 class="code-header">DefineFile(<a class="struct" href="struct.FileEntry.html" title="struct gimli::read::FileEntry">FileEntry</a>&lt;R&gt;)</h3></section><div class="docblock"><p>Defines a new source file in the line number program and appends it to
the line number program header’s list of source files.</p>
</div><section id="variant.SetDiscriminator" class="variant"><a href="#variant.SetDiscriminator" class="anchor">§</a><h3 class="code-header">SetDiscriminator(<a class="primitive" href="https://doc.rust-lang.org/1.76.0/core/primitive.u64.html">u64</a>)</h3></section><div class="docblock"><p>“The DW_LNE_set_discriminator opcode takes a single parameter, an
unsigned LEB128 integer. It sets the discriminator register to the new
value.”</p>
</div><section id="variant.UnknownExtended" class="variant"><a href="#variant.UnknownExtended" class="anchor">§</a><h3 class="code-header">UnknownExtended(<a class="struct" href="../constants/struct.DwLne.html" title="struct gimli::constants::DwLne">DwLne</a>, R)</h3></section><div class="docblock"><p>An unknown extended opcode and the slice of its unparsed operands.</p>
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