interp

Testing interpreter dispatch methods: Switching, Direct Threaded Code, Indirect Threaded Code, Tail-Calls and machine code Inlining.

Supports x86, x86-64, arm, aarch64, mips, mipsel, rv32, rv64, xtensa architectures.

Building on Linux

clang main.c -I./src -Os -fPIC -o interp
# Or use GCC:
#gcc main.c -I./src -Os -fPIC -o interp

./interp
Generating Code @ 0x7f9b51765000
Code: 166 bytes
Stack: 00000000 00000000 00000000

Building for ESP8266/ESP32/ARM devices

Use PlatformIO to build and upload, i.e.:

pio run -e ESP32 -t upload && pio device monitor
# Supported envs: ESP32, ESP8266, TinyBLE, BLENano2, SipeedMAIX

Example VM code

// === Count down from 1000 to 0
PUSH(1000);     // Push 1000 to VM stack
LABEL(loop);    // Store current code position to label "loop"               <┐
    DEC();      // Decrement stack top                                        │
    JNZ(loop);  // Check stack top. If it's non-zero, jump to "loop" label    ┘
HALT();         // Halt machine

Emulating with QEMU

sudo apt install qemu-user-static

# ARM
sudo apt install gcc-arm-linux-gnueabihf libc6-dev-armhf-cross
arm-linux-gnueabihf-gcc -static main.c -I./src -Os -fPIC -o interp-arm
qemu-arm-static ./interp-arm

# AARCH64
sudo apt install gcc-aarch64-linux-gnu libc6-dev-arm64-cross
aarch64-linux-gnu-gcc -static main.c -I./src -Os -fPIC -o interp-aarch64
qemu-aarch64-static ./interp-aarch64

# MIPS(EL)
sudo apt-get install gcc-mipsel-linux-gnu libc6-dev-mipsel-cross
mipsel-linux-gnu-gcc -static main.c -I./src -Os -fPIC -o interp-mipsel
qemu-mipsel-static ./interp-mipsel

# MIPS
sudo apt-get install gcc-mips-linux-gnu libc6-dev-mips-cross
mips-linux-gnu-gcc -static main.c -I./src -Os -fPIC -o interp-mips
qemu-mips-static ./interp-mips

# RV64
sudo apt install gcc-riscv64-linux-gnu libc6-dev-riscv64-cross
riscv64-linux-gnu-gcc -static main.c -I./src -Os -fPIC -o interp-rv64
qemu-riscv64-static ./interp-rv64