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Replace ~80% of code in llvm_interpreter.rs by just hand-writing a prelude #48

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Replace ~80% of code in llvm_interpreter.rs by just hand-writing a prelude #48

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4 changes: 4 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -7,3 +7,7 @@
# Allow users to have special .ignore files for things like
# setting $PATH
*.ignore

# Ignore generated LLVM bitcode file because it's a binary blob meant
# for fast de-serialisation.
lib/prelude.bc
11 changes: 11 additions & 0 deletions build.rs
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Expand Up @@ -6,12 +6,23 @@ use std::fs;
use std::fs::{DirEntry, File};
use std::path::PathBuf;
use std::env;
use std::process::{Command};

fn main() {
peg::cargo_build("src/grammar.rustpeg");
if cfg!(feature = "file-tests") {
generate_tests().unwrap();
}
if cfg!(feature = "llvm-backend") {
// convert the prelude's readable `.ll` file to a `.bc` (bitcode)
// file that is faster to read in. We choose to not version control
// the `.bc` file because it is a binary blob.
generate_prelude_bc();
}
}

fn generate_prelude_bc() {
assert!(Command::new("opt").args(&["lib/prelude.ll", "-o", "lib/prelude.bc"]).status().expect("failed to run opt").success());
}

fn generate_tests() -> io::Result<()> {
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134 changes: 134 additions & 0 deletions lib/prelude.ll
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@@ -0,0 +1,134 @@
; LLVM prelude that is linked against when building the module
@balloon_int = constant i32 0
@balloon_float = constant i32 1
@balloon_boolean = constant i32 2

; Function Attrs: argmemonly nounwind
declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i32, i1) #0

declare i8* @malloc(i32)

declare void @free(i8*)

declare i32 @write(i32, i8*, i32)

declare i32 @putchar(i32)

declare i32 @getchar()

define { i32, i64 }* @balloon_box_i64(i64 %input) {
entry:
%mallocmem = call i8* @malloc(i32 ptrtoint ({ i32, i64 }* getelementptr ({ i32, i64 }, { i32, i64 }* null, i32 1) to i32))
%box = bitcast i8* %mallocmem to { i32, i64 }*
%slotp = getelementptr inbounds { i32, i64 }, { i32, i64 }* %box, i32 0, i32 1
store i64 %input, i64* %slotp
%tagval = load i32, i32* @balloon_int
%box_tag = getelementptr inbounds { i32, i64 }, { i32, i64 }* %box, i32 0, i32 0
store i32 %tagval, i32* %box_tag
ret { i32, i64 }* %box
}

define i64 @balloon_unbox_i64({ i32, i64 }* %boxp) {
entry:
%slotp = getelementptr inbounds { i32, i64 }, { i32, i64 }* %boxp, i32 0, i32 1
%rawval = load i64, i64* %slotp
ret i64 %rawval
}

define { i32, i64 }* @balloon_box_f64(double %input) {
entry:
%f64_to_i64 = bitcast double %input to i64
%mallocmem = call i8* @malloc(i32 ptrtoint ({ i32, i64 }* getelementptr ({ i32, i64 }, { i32, i64 }* null, i32 1) to i32))
%box = bitcast i8* %mallocmem to { i32, i64 }*
%slotp = getelementptr inbounds { i32, i64 }, { i32, i64 }* %box, i32 0, i32 1
store i64 %f64_to_i64, i64* %slotp
%tagval = load i32, i32* @balloon_float
%box_tag = getelementptr inbounds { i32, i64 }, { i32, i64 }* %box, i32 0, i32 0
store i32 %tagval, i32* %box_tag
ret { i32, i64 }* %box
}

define double @balloon_unbox_f64({ i32, i64 }* %boxp) {
entry:
%slotp = getelementptr inbounds { i32, i64 }, { i32, i64 }* %boxp, i32 0, i32 1
%rawval = load i64, i64* %slotp
%i64_to_f64 = bitcast i64 %rawval to double
ret double %i64_to_f64
}

define i32 @balloon_unbox_tag({ i32, i64 }* %boxp) {
entry:
%tagp = getelementptr inbounds { i32, i64 }, { i32, i64 }* %boxp, i32 0, i32 0
%tag = load i32, i32* %tagp
ret i32 %tag
}

define { i32, i64 }* @balloon_add_box_f64_box_f64({ i32, i64 }* %box1, { i32, i64 }* %box2) {
entry:
%raw1 = call double @balloon_unbox_f64({ i32, i64 }* %box1)
%raw2 = call double @balloon_unbox_f64({ i32, i64 }* %box2)
%sum = fadd double %raw1, %raw2
%boxed_sum = call { i32, i64 }* @balloon_box_f64(double %sum)
ret { i32, i64 }* %boxed_sum
}

define { i32, i64 }* @balloon_add_box_i64_box_f64({ i32, i64 }* %box1, { i32, i64 }* %box2) {
entry:
%raw1 = call i64 @balloon_unbox_i64({ i32, i64 }* %box1)
%raw2 = call double @balloon_unbox_f64({ i32, i64 }* %box2)
%raw1_float = sitofp i64 %raw1 to double
%sum = fadd double %raw1_float, %raw2
%boxed_sum = call { i32, i64 }* @balloon_box_f64(double %sum)
ret { i32, i64 }* %boxed_sum
}

define { i32, i64 }* @balloon_add_box_i64_box_i64({ i32, i64 }* %box1, { i32, i64 }* %box2) {
entry:
%raw1 = call i64 @balloon_unbox_i64({ i32, i64 }* %box1)
%raw2 = call i64 @balloon_unbox_i64({ i32, i64 }* %box2)
%sum = add i64 %raw1, %raw2
%boxed_sum = call { i32, i64 }* @balloon_box_i64(i64 %sum)
ret { i32, i64 }* %boxed_sum
}

define { i32, i64 }* @balloon_add_box_box({ i32, i64 }* %box1, { i32, i64 }* %box2) {
entry:
%tag1 = call i32 @balloon_unbox_tag({ i32, i64 }* %box1)
%tag2 = call i32 @balloon_unbox_tag({ i32, i64 }* %box2)
switch i32 %tag1, label %unknown_add_types [
i32 0, label %int_wildcard
i32 1, label %float_wildcard
]

unknown_add_types: ; preds = %entry, %float_wildcard, %int_wildcard
%errorbox = call { i32, i64 }* @balloon_box_i64(i64 -42)
ret { i32, i64 }* %errorbox

float_float: ; preds = %float_wildcard
%sum = call { i32, i64 }* @balloon_add_box_f64_box_f64({ i32, i64 }* %box1, { i32, i64 }* %box2)
ret { i32, i64 }* %sum

int_int: ; preds = %int_wildcard
%sum1 = call { i32, i64 }* @balloon_add_box_i64_box_i64({ i32, i64 }* %box1, { i32, i64 }* %box2)
ret { i32, i64 }* %sum1

float_int: ; preds = %float_wildcard
%sum2 = call { i32, i64 }* @balloon_add_box_i64_box_f64({ i32, i64 }* %box2, { i32, i64 }* %box1)
ret { i32, i64 }* %sum2

int_float: ; preds = %int_wildcard
%sum3 = call { i32, i64 }* @balloon_add_box_i64_box_f64({ i32, i64 }* %box1, { i32, i64 }* %box2)
ret { i32, i64 }* %sum3

int_wildcard: ; preds = %entry
switch i32 %tag2, label %unknown_add_types [
i32 0, label %int_int
i32 1, label %int_float
]

float_wildcard: ; preds = %entry
switch i32 %tag2, label %unknown_add_types [
i32 0, label %float_int
i32 1, label %float_float
]
}
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