Difference between revisions of "WebAssembly/Compiler"
(→Compiling the compiler: - updated compilation instructions to point to the WASM SVN branch (where Dmitry's work on github has been integrated into and where I have continued working on it)) |
(→Compiling the compiler: - compilation should be done via makefiles) |
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cd fpc-wasm | cd fpc-wasm | ||
| − | + | ==== WASI target ==== | |
| − | make - | + | make all OS_TARGET=wasi CPU_TARGET=wasm32 BINUTILSPREFIX= OPT="-O-" PP=fpc |
| − | ==== | + | ==== Embedded target ==== |
| − | + | make all OS_TARGET=embedded CPU_TARGET=wasm32 BINUTILSPREFIX= OPT="-O-" PP=fpc | |
| − | |||
| − | |||
| − | ==== | ||
| − | |||
=== Using the compiler === | === Using the compiler === | ||
Revision as of 05:57, 31 January 2021
Instructions
Compiling the compiler
Get the sources:
svn checkout https://svn.freepascal.org/svn/fpc/branches/wasm/ fpc-wasm
enter the directory:
cd fpc-wasm
WASI target
make all OS_TARGET=wasi CPU_TARGET=wasm32 BINUTILSPREFIX= OPT="-O-" PP=fpc
Embedded target
make all OS_TARGET=embedded CPU_TARGET=wasm32 BINUTILSPREFIX= OPT="-O-" PP=fpc
Using the compiler
You need a system.pas unit. It can be found here:
You'll also need the wasm bin tools:
Extract the binaries and put them somewhere in your PATH.
You'll also need the wasmtool:
- Compile wasmtool.lpi
Put wasmtool somewhere in your PATH
And finally you need wasm-ld (don't confuse it with wasmld).
- Download the llvm-9 release, and put the bin/ldd as wasmld in your PATH.
Hint: If your fpc.cfg has
#IFDEF FPC_CROSSCOMPILING #IFDEF NEEDCROSSBINUTILS -XP$FPCTARGET- #ENDIF #ENDIF
Enclose it in #IFNDEF CPUWASM :
#IFDEF FPC_CROSSCOMPILING #IFDEF NEEDCROSSBINUTILS #ifndef cpuwasm -XP$FPCTARGET- #endif #ENDIF #ENDIF
Otherwise, you have to create symlinks wasm-wasm-wasmld to wasmld, and wasm-wasm-wasmtool to wasmtool.
wasm-demo
Wasm-demo is a Pascal WebAssembly demo project, ported Google's C WebAssembly example (https://codelabs.developers.google.com/codelabs/web-assembly-intro)
You follow these steps in order to get the demo project working:
1. Get the project sources: https://github.com/skalogryz/wasm-demo
Using in webassembly.studio
2. Run the wasm compiler against lyff.pas, but request the assembler file to be kept
pp -a lyff.pas
Webassembly.studio accepts the assembler file and would compile it on the server side.
3. open up https://webassembly.studio and select "Create empty Wat Project". The project will consist of:
- main.html
- main.js
- main.wat
All files of the project can be edited through the web interface.
4. Copy and paste the contents of the following files:
- (compiled) lyff.wat to main.wat.
- wasm-demo\webassembly.studio\main.html to main.html
- wasm-demo\webassembly.studio\main.js to main.js
Note: every time you copy and paste, don't forget to press "SAVE" button (on the right side of the web interface)
5. once all files are update, hit "Build and Run"
