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![#include <stdio.h>
int main(int argc, char* argv[]){
puts(“Hello World!”);
return 0;
}
In C
Hello World!
print “Hello World!”
In Python
Hello World!
魔法 我想學魔法!](https://image.slidesharecdn.com/llvmkeynotestatic-160820005906-160829052138/75/COSCUP2016-LLVM-6-2048.jpg)
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COSCUP2016 - LLVM框架、由淺入淺
文档介绍了LLVM框架及其编译流程，包括前端、后端和优化阶段的设计架构。提到不同编程语言的编译实现以及RAISE和SSA等重要概念。还包含LLVM相关资料和开发资源的链接。
![[嵌入式系統] 嵌入式系統進階](https://cdn.slidesharecdn.com/ss_thumbnails/advembedded-150613071653-lva1-app6892-thumbnail.jpg?width=640&height=640&fit=bounds)
COSCUP2016 - LLVM框架、由淺入淺
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- 3. 楊宗凡 — 浪打 ‣成功⼤大學電機系四年級 ‣ sonic.tw.tp (at) gmail.com 戴宏穎 — Hydai ‣ 清華⼤大學資⼯工碩⼀一年級 ‣ z54981220 (at) gmail.com
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- 5. Code to Executable $gcc helloworld.c
- 6. #include <stdio.h> int main(intargc, char* argv[]){ puts(“Hello World!”); return 0; } In C Hello World! print “Hello World!” In Python Hello World! 魔法 我想學魔法!
- 7. The Magic 原始碼 組合語⾔言機械碼 AssemblerCompiler print “!@#$” mov d, msg$ mov c, 9 call 5 110100…. >./hw 機械碼 110100…. Hello World!
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- 9. bdos equ 0005H start:mvi c,9 lxi d,msg$ call bdos ret msg$:db 'Hello, world!$' end start Intel 8080 Assembler MSG: .ASCIIZ "Hello, world!" LDX #0 LDA MSG,X @LP: JSR $FFD2 INX LDA MSG,X BNE @LP RTS MOS 6502 8080 Assemble 6502 Assemble 110110.. 010111.. CP/M Apple Dos
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- 12. Modern Compiler $ exportCFLAGS = “-O3”
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- 22. LLVM Framework $ gitclone http://llvm.org/git/llvm.git
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- 24. IR LLVM Framework - FrontEnd 原始碼 Backend 組合語⾔言Frontend IRPass IR Pass … Pass IR Pass
- 25. IR LLVM Framework - Optimizer 原始碼Backend 組合語⾔言Frontend IRPass IR Pass … Pass IR Pass
- 26. IR LLVM Framework - BackEnd 原始碼 Backend 組合語⾔言Frontend IRPass IR Pass … Pass IR Pass
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- 28. Front End $ clang-S -emit-llvm main.c
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- 32. Whitespace 簡介 • 只有三種Tokens： • Space 空⽩白(' ') • Tabs 制表符(t) • New lines 換⾏行(n) • 其餘的字元全部都被當成註解
- 33. Front End toIR 程式碼 LLVM IR
- 34. Front End toIR 程式碼 LLVM IRParser LLVM API • Module • IRBuilder • Function • BasicBlock • Instruction
- 35. LLVM IR $ catmain.ll
- 36. LLVM IR • RISC-style(Reduced Instruction Set Computing) • ⼈人類可讀的 • 具備 SSA form (Static Single Assignment) • 無限多的虛擬暫存器 • 任意位元⼤大⼩小 • 不改變⾏行為下 Transform IR ，來做最佳化。
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- 39. int a = 1;
- 40. int c = a+b;
- 41. Optimizer • LLVM 使⽤用opt 做最佳化 • 每⼀一種類的分析跟轉換的 pass 都是 opt 的參數 • opt 會照順序幫你⼀一個⼀一個⾛走過這些 pass • 每個 pass 會⾃自⼰己決定要不要做事
- 42. opt 剛才的 CCode
- 43. Backend $ llc -march=z80main.ll
- 44. Basic Ideas LLVM IR組合語⾔言
- 45. Basic Ideas SelectionDAGLLVM IR組合語⾔言 •Combining •Legalizing •Scheduling •Register Allocation
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- 47. llvm::SelectionDAGISel LLVM IR 組合語⾔言 OriginalDAG Combined DAG Legalized DAG Target Legalizing DAG Combiner Instruction Selection TableGe n
- 48. llvm::SelectionDAGISel LLVM IR 組合語⾔言 OriginalDAG Combined DAG Legalized DAG Target Legalizing DAG Combiner Instruction Selection TableGe n
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- 54. llvm::SelectionDAGISel LLVM IR 組合語⾔言 OriginalDAG Combined DAG Legalized DAG Target Legalizing DAG Combiner Instruction Selection TableGe n
- 55. Demo A 40 yearsportal by LLVM, Linking 1976 and 2016
- 56. Demo A 40 yearsportal by LLVM, Linking 1976 and 2016 WhiteSpace LLVM IR 組合語⾔言 CP/M LLVM Zilog Z80
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- 59. 1. Architecture forNext Generation GCC ftp://gcc.gnu.org/pub/gcc/summit/2003/Architecture%20for%20a%20Next-Generation %20GCC.pdf 2. Life of an Instruction in LLVM http://eli.thegreenplace.net/2012/11/24/life-of-an-instruction-in-llvm 3. A deeper look into the LLVM code generator http://eli.thegreenplace.net/2013/02/25/a-deeper-look-into-the-llvm-code-generator- part-1 4. LLVM TableGen Documentation http://llvm.org/docs/TableGen/index.html 5. LLVM TableGen Introduction http://llvm.org/docs/TableGen/LangIntro.html 6. Independent Code Generator http://llvm.org/docs/CodeGenerator.html 7. The Relationship between selectiondag and selectiondagisel http://stackoverflow.com/questions/26814062/the-relationship-between-selectiondag- and-selectiondagisel 8. How TableGen’s DAGISel Backend Works https://github.com/draperlaboratory/fracture/wiki/How-TableGen's-DAGISel-Backend- Works 9. ZASM - Z80 Assembler http://k1.spdns.de/Develop/Projects/zasm/Documentation/ 10. LLVM Z80 Backend https://github.com/mostlyuseful/llvm-z80/network 11. Whitespace LLVM https://github.com/Subv/Whitespace-LLVM
- 60. Q & A $man man