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class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">bf/</div>bf.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"> <a href="#1" id="1">1</a> <a href="#2" id="2">2</a> <a href="#3" id="3">3</a> <a href="#4" id="4">4</a> <a href="#5" id="5">5</a> <a href="#6" id="6">6</a> <a href="#7" id="7">7</a> <a href="#8" id="8">8</a> <a href="#9" id="9">9</a> <a href="#10" id="10">10</a> <a href="#11" id="11">11</a> <a href="#12" id="12">12</a> <a href="#13" id="13">13</a> <a href="#14" id="14">14</a> <a href="#15" id="15">15</a> <a href="#16" id="16">16</a> <a href="#17" id="17">17</a> <a href="#18" id="18">18</a> <a href="#19" id="19">19</a> <a href="#20" id="20">20</a> <a href="#21" id="21">21</a> <a href="#22" id="22">22</a> <a href="#23" id="23">23</a> 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Brainfuck VM. //! //! This example implements a simple //! [brainfuck](https://en.wikipedia.org/wiki/Brainfuck) interpreter //! [`BrainfuckInterp`] and a jit compiler [`BrainfuckJit`]. //! //! Brainfuck is an esoteric programming languge existing of 8 commands. //! - `>` increment data pointer. //! - `<` decrement data pointer. //! - `+` increment data at current data pointer. //! - `-` decrement data at current data pointer. //! - `.` output data at current data pointer. //! - `,` read input and store at current data pointer. //! - `[` jump behind matching ']' if data at data pointer is zero. //! - `]` jump behind matching '[' if data at data pointer is non-zero. </span><span class="kw">use </span>std::collections::HashMap; <span class="kw">use </span>std::io::Write; <span class="kw">use </span>juicebox_asm::insn::<span class="kw-2">*</span>; <span class="kw">use </span>juicebox_asm::Runtime; <span class="kw">use </span>juicebox_asm::{Asm, Imm64, Imm8, Label, MemOp, MemOp8, Reg64, Reg8}; <span class="kw">struct </span>BrainfuckInterp { pc: usize, imem: Vec<char>, dptr: usize, dmem: [u8; <span class="number">256</span>], branches: HashMap<usize, usize>, } <span class="kw">impl </span>BrainfuckInterp { <span class="kw">fn </span>new(prog: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, String> { <span class="comment">// Do a first pass over the bf program to filter whitespace and detect invalid tokens. // Additionally validate all conditional branches, and compute their branch target. </span><span class="kw">let </span>(imem, branches) = { <span class="comment">// Instruction memory holding the final bf program. </span><span class="kw">let </span><span class="kw-2">mut </span>imem = Vec::new(); <span class="comment">// Helper to track index of open brackets. </span><span class="kw">let </span><span class="kw-2">mut </span>lhs_brackets = Vec::new(); <span class="comment">// Mapping from branch instruction to branch target. </span><span class="kw">let </span><span class="kw-2">mut </span>branches = HashMap::new(); <span class="kw">for </span>(idx, token) <span class="kw">in </span>prog.chars().filter(|c| !c.is_whitespace()).enumerate() { <span class="kw">match </span>token { <span class="string">'<' </span>| <span class="string">'>' </span>| <span class="string">'+' </span>| <span class="string">'-' </span>| <span class="string">'.' </span>| <span class="string">',' </span>=> { <span class="comment">/* ignore valid bf tokens */ </span>} <span class="string">'[' </span>=> lhs_brackets.push(idx), <span class="string">']' </span>=> { <span class="kw">if let </span><span class="prelude-val">Some</span>(lhs) = lhs_brackets.pop() { branches.insert(lhs, idx); branches.insert(idx, lhs); } <span class="kw">else </span>{ <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"encountered un-balanced brackets, found ']' at index {idx} without matching '['"</span>)); } } <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"invalid bf token '{token}'"</span>)), } imem.push(token) } <span class="kw">if </span>!lhs_brackets.is_empty() { <span class="kw">return </span><span class="prelude-val">Err</span>(String::from( <span class="string">"encountered un-balanced brackets, left-over '[' after parsing bf program"</span>, )); } (imem, branches) }; <span class="prelude-val">Ok</span>(BrainfuckInterp { pc: <span class="number">0</span>, imem, dptr: <span class="number">0</span>, dmem: [<span class="number">0</span>; <span class="number">256</span>], branches, }) } } <span class="kw">fn </span>run_interp(prog: <span class="kw-2">&</span>str) { <span class="kw">let </span><span class="kw-2">mut </span>vm = BrainfuckInterp::new(prog).unwrap(); <span class="kw">loop </span>{ <span class="kw">let </span>insn = <span class="kw">match </span>vm.imem.get(vm.pc) { <span class="prelude-val">Some</span>(insn) => insn, <span class="prelude-val">None </span>=> <span class="kw">break</span>, <span class="comment">// End of bf program. </span>}; <span class="kw">let </span>putchar = |val: u8| { std::io::stdout() .write(<span class="kw-2">&</span>[val]) .expect(<span class="string">"Failed to write to stdout!"</span>); }; <span class="kw">match </span>insn { <span class="string">'>' </span>=> { vm.dptr += <span class="number">1</span>; <span class="macro">assert!</span>(vm.dptr < vm.dmem.len()); } <span class="string">'<' </span>=> { <span class="macro">assert!</span>(vm.dptr > <span class="number">0</span>); vm.dptr -= <span class="number">1</span>; } <span class="string">'+' </span>=> { vm.dmem[vm.dptr] += <span class="number">1</span>; } <span class="string">'-' </span>=> { vm.dmem[vm.dptr] -= <span class="number">1</span>; } <span class="string">'.' </span>=> { putchar(vm.dmem[vm.dptr]); } <span class="string">',' </span>=> { <span class="macro">unimplemented!</span>(<span class="string">"getchar"</span>); } <span class="string">'[' </span>=> { <span class="kw">if </span>vm.dmem[vm.dptr] == <span class="number">0 </span>{ vm.pc = <span class="kw-2">*</span>vm.branches.get(<span class="kw-2">&</span>vm.pc).unwrap(); } } <span class="string">']' </span>=> { <span class="kw">if </span>vm.dmem[vm.dptr] != <span class="number">0 </span>{ vm.pc = <span class="kw-2">*</span>vm.branches.get(<span class="kw-2">&</span>vm.pc).unwrap(); } } <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), } vm.pc += <span class="number">1</span>; } } <span class="comment">// -- BRAINFUCK JIT -------------------------------------------------------------- </span><span class="attr">#[cfg(not(any(target_arch = <span class="string">"x86_64"</span>, target_os = <span class="string">"linux"</span>)))] </span><span class="macro">compile_error!</span>(<span class="string">"Only supported on x86_64 with SystemV abi"</span>); <span class="kw">struct </span>BrainfuckJit { imem: Vec<char>, dmem: [u8; <span class="number">256</span>], } <span class="kw">impl </span>BrainfuckJit { <span class="kw">fn </span>new(prog: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, String> { <span class="comment">// Do a first pass over the bf program to filter whitespace and detect invalid tokens. </span><span class="kw">let </span>imem = prog .chars() .filter(|c| !c.is_whitespace()) .map(|c| <span class="kw">match </span>c { <span class="string">'<' </span>| <span class="string">'>' </span>| <span class="string">'+' </span>| <span class="string">'-' </span>| <span class="string">'.' </span>| <span class="string">',' </span>| <span class="string">'[' </span>| <span class="string">']' </span>=> <span class="prelude-val">Ok</span>(c), <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"invalid bf token '{c}'"</span>)), }) .collect::<<span class="prelude-ty">Result</span><Vec<char>, String>>()<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(BrainfuckJit { imem, dmem: [<span class="number">0</span>; <span class="number">256</span>], }) } } <span class="kw">extern </span><span class="string">"C" </span><span class="kw">fn </span>putchar(c: u8) { std::io::stdout() .write(<span class="kw-2">&</span>[c]) .expect(<span class="string">"Failed to write to stdout!"</span>); } <span class="kw">fn </span>run_jit(prog: <span class="kw-2">&</span>str) { <span class="kw">let </span><span class="kw-2">mut </span>vm = BrainfuckJit::new(prog).unwrap(); <span class="comment">// Use callee saved registers to hold vm state, such that we don't // need to save any state before calling out to putchar. </span><span class="kw">let </span>dmem_base = Reg64::rbx; <span class="kw">let </span>dmem_idx = Reg64::r12; <span class="kw">let </span><span class="kw-2">mut </span>asm = Asm::new(); <span class="comment">// Move data memory pointer (argument on jit entry) into correct // register. </span>asm.mov(dmem_base, Reg64::rdi); <span class="comment">// Clear data memory index. </span>asm.xor(dmem_idx, dmem_idx); <span class="comment">// A stack of label pairs, used to link up forward and backward // jumps for a given '[]' pair. </span><span class="kw">let </span><span class="kw-2">mut </span>label_stack = Vec::new(); <span class="comment">// Generate code for each instruction in the bf program. </span><span class="kw">for </span>insn <span class="kw">in </span>vm.imem { <span class="kw">match </span>insn { <span class="string">'>' </span>=> { <span class="comment">// TODO: generate runtime bounds check. </span>asm.inc(dmem_idx); } <span class="string">'<' </span>=> { <span class="comment">// TODO: generate runtime bounds check. </span>asm.dec(dmem_idx); } <span class="string">'+' </span>=> { asm.inc(MemOp8::from(MemOp::IndirectBaseIndex(dmem_base, dmem_idx))); } <span class="string">'-' </span>=> { asm.dec(MemOp8::from(MemOp::IndirectBaseIndex(dmem_base, dmem_idx))); } <span class="string">'.' </span>=> { <span class="comment">// Load data memory from active cell into di register, // which is the first argument register according to // the SystemV abi, then call into putchar. Since we // stored all out vm state in callee saved registers // we don't need to save any registers before the // call. </span>asm.mov(Reg8::dil, MemOp::IndirectBaseIndex(dmem_base, dmem_idx)); asm.mov(Reg64::rax, Imm64::from(putchar <span class="kw">as </span>usize)); asm.call(Reg64::rax); } <span class="string">',' </span>=> { <span class="macro">unimplemented!</span>(<span class="string">"getchar"</span>); } <span class="string">'[' </span>=> { <span class="comment">// Create new label pair. </span>label_stack.push((Label::new(), Label::new())); <span class="comment">// UNWRAP: We just pushed a new entry on the stack. </span><span class="kw">let </span>label_pair = label_stack.last_mut().unwrap(); <span class="comment">// Goto label_pair.0 if data memory at active cell is 0. // if vm.dmem[vm.dptr] == 0 goto label_pair.0 </span>asm.cmp( MemOp::IndirectBaseIndex(dmem_base, dmem_idx), Imm8::from(<span class="number">0u8</span>), ); asm.jz(<span class="kw-2">&mut </span>label_pair.<span class="number">0</span>); <span class="comment">// Bind label_pair.1 after the jump instruction, which // will be the branch target for the matching ']'. </span>asm.bind(<span class="kw-2">&mut </span>label_pair.<span class="number">1</span>); } <span class="string">']' </span>=> { <span class="kw">let </span><span class="kw-2">mut </span>label_pair = label_stack .pop() .expect(<span class="string">"encountered un-balanced brackets, found ']' without matching '['"</span>); <span class="comment">// Goto label_pair.1 if data memory at active cell is // not 0. // if vm.dmem[vm.dptr] != 0 goto label_pair.1 </span>asm.cmp( MemOp::IndirectBaseIndex(dmem_base, dmem_idx), Imm8::from(<span class="number">0u8</span>), ); asm.jnz(<span class="kw-2">&mut </span>label_pair.<span class="number">1</span>); <span class="comment">// Bind label_pair.0 after the jump instruction, which // is the branch target for the matching '['. </span>asm.bind(<span class="kw-2">&mut </span>label_pair.<span class="number">0</span>); } <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), } } <span class="comment">// Return from bf program. </span>asm.ret(); <span class="kw">if </span>!label_stack.is_empty() { <span class="macro">panic!</span>(<span class="string">"encountered un-balanced brackets, left-over '[' after jitting bf program"</span>) } <span class="comment">// Execute jitted bf program. </span><span class="kw">let </span><span class="kw-2">mut </span>rt = Runtime::new(); <span class="kw">let </span>bf_entry = <span class="kw">unsafe </span>{ rt.add_code::<<span class="kw">extern </span><span class="string">"C" </span><span class="kw">fn</span>(<span class="kw-2">*mut </span>u8)>(asm.into_code()) }; bf_entry(<span class="kw-2">&mut </span>vm.dmem <span class="kw">as </span><span class="kw-2">*mut </span>u8); } <span class="kw">fn </span>main() { <span class="comment">// https://en.wikipedia.org/wiki/Brainfuck#Adding_two_values //let inp = "++>+++++ [<+>-] ++++++++[<++++++>-]<."; //println!("add-print-7 (wikipedia.org) - interp"); //run_interp(inp); //println!("add-print-7 (wikipedia.org) - jit"); //run_jit(inp); // https://en.wikipedia.org/wiki/Brainfuck#Hello_World! </span><span class="kw">let </span>inp = <span class="string">"++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."</span>; <span class="macro">println!</span>(<span class="string">"hello-world (wikipedia.org) - interp"</span>); run_interp(inp); <span class="macro">println!</span>(<span class="string">"hello-world (wikipedia.org) - jit"</span>); run_jit(inp); <span class="comment">// https://programmingwiki.de/Brainfuck </span><span class="kw">let </span>inp = <span class="string">">+++++++++[<++++++++>-]<.>+++++++[<++++>-]<+.+++++++..+++.[-]>++++++++[<++++>-] <.>+++++++++++[<++++++++>-]<-.--------.+++.------.--------.[-]>++++++++[<++++>- ]<+.[-]++++++++++."</span>; <span class="macro">println!</span>(<span class="string">"hello-world (programmingwiki.de) - interp"</span>); run_interp(inp); <span class="macro">println!</span>(<span class="string">"hello-world (programmingwiki.de) - jit"</span>); run_jit(inp); } </code></pre></div></section></main></body></html>