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Diffstat (limited to 'codegen/expr2rust.mac')
| -rw-r--r-- | codegen/expr2rust.mac | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/codegen/expr2rust.mac b/codegen/expr2rust.mac new file mode 100644 index 0000000..e4e6be8 --- /dev/null +++ b/codegen/expr2rust.mac @@ -0,0 +1,31 @@ +/* + * Rust code generation for gipfel-rs. + * + * Port of gipfel's expr2c.mac (Copyright 2006-2009 Johannes Hofmann). + * Emits one Rust function per line (grep "^pub fn"); integer literals are + * converted to float literals by fixup.py afterwards. + */ + +load("stringproc")$ + +varsubst(v) := ssubst("_", "%", string(v))$ + +printdecl(vars) := ( + sprint("let mut", varsubst(first(vars)), ": f64 = 0.0;"), + for v in rest(vars) do sprint("let mut", varsubst(v), ": f64 = 0.0;"))$ + +printdef(expr) := sprint(varsubst(first(expr)), "=", varsubst(second(expr)), ";")$ + +block2rust(expr) := + if ?equal(op(expr), block) then ( + printdecl(first(expr)), + for d in reverse(rest(reverse(rest(expr)))) do printdef(d), + sprint("return", varsubst(last(expr)), ";")) + else + sprint("return", varsubst(expr), ";")$ + +expr2rust(funcname, argstr, expr) := ( + sprint("pub fn", funcname, "(", argstr, ") -> f64 {"), + block2rust(subst(pow, "^", optimize(expr))), + sprint("}", " +"))$ |