compiler/arch.ts

@@ -22,8 +22,6 @@ export const Ops = {
     Jump: 0x0e,
     JumpIfTrue: 0x0f,
     Builtin: 0x10,
-    Duplicate: 0x11,
-    Swap: 0x12,
     Add: 0x20,
     Subtract: 0x21,
     Multiply: 0x22,

compiler/assembler.ts

@@ -1,4 +1,4 @@
-import { opToString } from "./arch.ts";
+import { Ops, opToString } from "./arch.ts";
 
 export type Line = { labels?: string[]; ins: Ins };
 
@@ -14,28 +14,7 @@ export type Refs = { [key: number]: string };
 export class Assembler {
     private lines: Line[] = [];
     private addedLabels: string[] = [];
-
-    private constructor(private labelCounter: number) {}
-
-    public static newRoot(): Assembler {
-        return new Assembler(0);
-    }
-
-    public fork(): Assembler {
-        return new Assembler(this.labelCounter);
-    }
-
-    public join(assembler: Assembler) {
-        this.labelCounter = assembler.labelCounter;
-        if (assembler.lines.length < 0) {
-            return;
-        }
-        if (assembler.lines[0].labels !== undefined) {
-            this.addedLabels.push(...assembler.lines[0].labels);
-        }
-        this.add(...assembler.lines[0].ins);
-        this.lines.push(...assembler.lines.slice(1));
-    }
+    private labelCounter = 0;
 
     public add(...ins: Ins): Assembler {
         if (this.addedLabels.length > 0) {
@@ -47,6 +26,17 @@ export class Assembler {
         return this;
     }
 
+    public concat(assembler: Assembler) {
+        if (assembler.lines.length < 0) {
+            return;
+        }
+        if (assembler.lines[0].labels !== undefined) {
+            this.addedLabels.push(...assembler.lines[0].labels);
+        }
+        this.add(...assembler.lines[0].ins);
+        this.lines.push(...assembler.lines.slice(1));
+    }
+
     public makeLabel(): Label {
         return { label: `.L${(this.labelCounter++).toString()}` };
     }

compiler/lowerer.ts

@@ -8,7 +8,7 @@ import { Pos } from "./token.ts";
 export type FnNamesMap = { [pc: number]: string };
 
 export class Lowerer {
-    private program = Assembler.newRoot();
+    private program = new Assembler();
     private locals: Locals = new LocalsFnRoot();
     private fnStmtIdLabelMap: { [stmtId: number]: string } = {};
     private fnLabelNameMap: { [name: string]: string } = {};
@@ -19,16 +19,16 @@ export class Lowerer {
 
     public lower(stmts: Stmt[]) {
         this.addClearingSourceMap();
-        this.program.add(Ops.PushPtr, { label: "main" });
-        this.program.add(Ops.Call, 0);
-        this.program.add(Ops.PushPtr, { label: "_exit" });
+        this.program.add(Ops.PushPtr, { label: "_start" });
         this.program.add(Ops.Jump);
         this.scoutFnHeaders(stmts);
         for (const stmt of stmts) {
             this.lowerStaticStmt(stmt);
         }
-        this.program.setLabel({ label: "_exit" });
+        this.program.setLabel({ label: "_start" });
         this.addSourceMap(this.lastPos);
+        this.program.add(Ops.PushPtr, { label: "main" });
+        this.program.add(Ops.Call, 0);
         this.program.add(Ops.Pop);
     }
 
@@ -171,7 +171,7 @@ export class Lowerer {
         const returnLabel = this.program.makeLabel();
         this.returnStack.push(returnLabel);
 
-        this.program = outerProgram.fork();
+        this.program = new Assembler();
         this.locals = fnRoot;
         for (const { ident } of stmt.kind.params) {
             this.locals.allocSym(ident);
@@ -185,17 +185,18 @@ export class Lowerer {
         }
         this.locals = outerLocals;
 
+        this.returnStack.pop();
+        this.program.setLabel(returnLabel);
+
         const localAmount = fnRoot.stackReserved() -
             stmt.kind.params.length;
         for (let i = 0; i < localAmount; ++i) {
             outerProgram.add(Ops.PushNull);
         }
 
-        this.returnStack.pop();
-        this.program.setLabel(returnLabel);
         this.program.add(Ops.Return);
 
-        outerProgram.join(this.program);
+        outerProgram.concat(this.program);
         this.program = outerProgram;
     }
 
@@ -352,8 +353,9 @@ export class Lowerer {
             switch (expr.kind.unaryType) {
                 case "-": {
                     this.program.add(Ops.PushInt, 0);
-                    this.program.add(Ops.Swap);
+                    this.program.add(Ops.PushInt, 1);
                     this.program.add(Ops.Subtract);
+                    this.program.add(Ops.Multiply);
                     return;
                 }
                 default:
@@ -371,25 +373,9 @@ export class Lowerer {
         if (expr.kind.type !== "binary") {
             throw new Error();
         }
-        const vtype = expr.kind.left.vtype!;
-        if (vtype.type === "bool") {
-            if (["or", "and"].includes(expr.kind.binaryType)) {
-                const shortCircuitLabel = this.program.makeLabel();
-                this.lowerExpr(expr.kind.left);
-                this.program.add(Ops.Duplicate);
-                if (expr.kind.binaryType === "and") {
-                    this.program.add(Ops.Not);
-                }
-                this.program.add(Ops.PushPtr, shortCircuitLabel);
-                this.program.add(Ops.JumpIfTrue);
-                this.program.add(Ops.Pop);
-                this.lowerExpr(expr.kind.right);
-                this.program.setLabel(shortCircuitLabel);
-                return;
-            }
-        }
         this.lowerExpr(expr.kind.left);
         this.lowerExpr(expr.kind.right);
+        const vtype = expr.kind.left.vtype!;
         if (vtype.type === "int") {
             switch (expr.kind.binaryType) {
                 case "+":
@@ -401,9 +387,6 @@ export class Lowerer {
                 case "*":
                     this.program.add(Ops.Multiply);
                     return;
-                case "/":
-                    this.program.add(Ops.Multiply);
-                    return;
                 case "==":
                     this.program.add(Ops.Equal);
                     return;
@@ -414,15 +397,6 @@ export class Lowerer {
                 case "<":
                     this.program.add(Ops.LessThan);
                     return;
-                case ">":
-                    this.program.add(Ops.Swap);
-                    this.program.add(Ops.LessThan);
-                    return;
-                case "<=":
-                    this.program.add(Ops.Swap);
-                    this.program.add(Ops.LessThan);
-                    this.program.add(Ops.Not);
-                    return;
                 case ">=":
                     this.program.add(Ops.LessThan);
                     this.program.add(Ops.Not);
@@ -445,6 +419,16 @@ export class Lowerer {
                 return;
             }
         }
+        if (vtype.type === "bool") {
+            if (expr.kind.binaryType === "or") {
+                this.program.add(Ops.Or);
+                return;
+            }
+            if (expr.kind.binaryType === "and") {
+                this.program.add(Ops.And);
+                return;
+            }
+        }
         throw new Error(
             `unhandled binaryType` +
                 ` '${vtypeToString(expr.vtype!)}' aka. ` +

examples/survey_code_coverage_program_2.slg

@@ -7,8 +7,10 @@ fn string_to_int_impl(text: string) -> int {
 
     let len = string_length(text);
     if len == 0 {
-        return -1;
+        return 1;
     }
+    println("hello world");
+
     if text[0] == "0"[0] {
         if len == 1 {
             0
@@ -39,28 +41,27 @@ fn parse_digits(text: string, base: int, digit_set: string) -> int {
 }
 
 fn char_val(ch: int) -> int {
-    if ch >= "0"[0] and ch <= "9"[0] {
+    if ch >= "0"[0] and "9"[0] >= ch {
         ch - "0"[0]
-    } else if ch >= "a"[0] and ch <= "f"[0] {
-        ch - "a"[0] + 10
+    } else if ch >= "a"[0] and "f"[0] >= ch {
+        ch - "a"[0]
     } else {
         -1
     }
 }
 
 fn test_string_to_int_impl() -> bool {
-        test("should convert zero",      assert_int_equal(string_to_int_impl("0"), 0))
-    and test("should convert decimal",   assert_int_equal(string_to_int_impl("10"), 10))
-    and test("should convert binary",    assert_int_equal(string_to_int_impl("0b110"), 6))
-    and test("should convert octal",     assert_int_equal(string_to_int_impl("071"), 57))
-    and test("should convert hex",       assert_int_equal(string_to_int_impl("0xaa"), 170))
-    and test("should fail",              assert_int_equal(string_to_int_impl("john"), -1))
-    and test("should fail",              assert_int_equal(string_to_int_impl(""), -1))
+       test("should convert zero",          assert_int_equal(string_to_int_impl("0"), 0))
+    or test("should convert decimal",       assert_int_equal(string_to_int_impl("10"), 10))
+    or test("should convert binary",        assert_int_equal(string_to_int_impl("0b110"), 6))
+    or test("should convert octal",         assert_int_equal(string_to_int_impl("071"), 51))
+    or test("should convert hexadecimal",   assert_int_equal(string_to_int_impl("0xaa"), 170))
+    or test("should fail",                  assert_int_equal(string_to_int_impl("john"), -1))
 }
 
 fn assert_int_equal(value: int, target: int) -> bool {
     if value != target {
-        println("assertion failed: " + itos(value) + " != " + itos(target));
+        println("assertion failed: " + int_to_string(value) + " != " + int_to_string(target));
         return false;
     }
     true
@@ -108,8 +109,6 @@ fn file_read_to_string(file: int) -> string #[builtin(FileReadToString)] {}
 fn file_flush(file: int) #[builtin(FileFlush)] {}
 fn file_eof(file: int) -> bool #[builtin(FileEof)] {}
 
-fn itos(number: int) -> string #[builtin(IntToString)] {}
-fn stoi(str: string) -> int #[builtin(StringToInt)] {}
 
 fn stdin() -> int { 0 }
 fn stdout() -> int { 1 }
@@ -176,11 +175,11 @@ fn string_split(str: string, seperator: int) -> [string] {
 fn string_slice(str: string, from: int, to: int) -> string {
     let result = "";
     let len = string_length(str);
-    let abs_to =
+    let actual_to =
         if to >= len { len }
-        else if to < 0 { len + to + 1 }
+        else if to < 0 { len - to }
         else { to };
-    for (let i = from; i < abs_to; i += 1) {
+    for (let i = from; i < actual_to; i += i) {
         result = string_push_char(result, str[i]);
     }
     result

runtime/arch.hpp

@@ -24,8 +24,6 @@ enum class Op : uint32_t {
     Jump = 0x0e,
     JumpIfTrue = 0x0f,
     Builtin = 0x10,
-    Duplicate = 0x11,
-    Swap = 0x12,
     Add = 0x20,
     Subtract = 0x21,
     Multiply = 0x22,

runtime/instruction_size.cpp

@@ -33,8 +33,6 @@ size_t VM::instruction_size(size_t i) const
             return 1;
         case Op::Builtin:
             return 2;
-        case Op::Duplicate:
-        case Op::Swap:
         case Op::Add:
         case Op::Subtract:
         case Op::Multiply:

runtime/to_string.cpp

@@ -25,8 +25,6 @@ auto sliger::maybe_op_to_string(uint32_t value) -> std::string
         case Op::Jump: return "Jump";
         case Op::JumpIfTrue: return "JumpIfTrue";
         case Op::Builtin: return "Builtin";
-        case Op::Duplicate: return "Duplicate";
-        case Op::Swap: return "Swap";
         case Op::Add: return "Add";
         case Op::Subtract: return "Subtract";
         case Op::Multiply: return "Multiply";
@@ -39,9 +37,10 @@ auto sliger::maybe_op_to_string(uint32_t value) -> std::string
         case Op::Xor: return "Xor";
         case Op::Not: return "Not";
         case Op::SourceMap: return "SourceMap";
-            /* clang-format on */
+        /* clang-format on */
+        default:
+            return std::to_string(value);
     }
-    return std::to_string(value);
 }
 
 auto sliger::maybe_builtin_to_string(uint32_t value) -> std::string

runtime/vm.cpp

@@ -177,21 +177,6 @@ void VM::run_instruction()
             run_builtin(static_cast<Builtin>(builtin_id));
             break;
         }
-        case Op::Duplicate: {
-            assert_stack_has(1);
-            auto value = stack_pop();
-            stack_push(value);
-            stack_push(value);
-            break;
-        }
-        case Op::Swap: {
-            assert_stack_has(2);
-            auto right = stack_pop();
-            auto left = stack_pop();
-            stack_push(right);
-            stack_push(left);
-            break;
-        }
         case Op::Add: {
             assert_stack_has(2);
             auto right = stack_pop().as_int().value;

stdlib.slg

@@ -27,8 +27,6 @@ fn file_read_to_string(file: int) -> string #[builtin(FileReadToString)] {}
 fn file_flush(file: int) #[builtin(FileFlush)] {}
 fn file_eof(file: int) -> bool #[builtin(FileEof)] {}
 
-fn itos(number: int) -> string #[builtin(IntToString)] {}
-fn stoi(str: string) -> int #[builtin(StringToInt)] {}
 
 fn stdin() -> int { 0 }
 fn stdout() -> int { 1 }

web/public/index.html

@@ -2,11 +2,6 @@
 <html>
     <head>
         <meta charset="utf-8">
-
-        <link rel="preconnect" href="https://fonts.googleapis.com">
-        <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
-        <link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:ital,wght@0,100..700;1,100..700&display=swap" rel="stylesheet">
-
         <link rel="stylesheet" href="style.css">
         <script src="dist/bundle.js" type="module" defer></script>
     </head>

web/public/src/flamegraph.ts

@@ -27,7 +27,7 @@ export function loadFlameGraph(
     canvas.width = 1000;
     canvas.height = 500;
 
-    const fnNameFont = "600 14px 'Roboto Mono'";
+    const fnNameFont = "600 14px monospace";
 
     const ctx = canvas.getContext("2d")!;
     ctx.font = fnNameFont;
@@ -39,7 +39,7 @@ export function loadFlameGraph(
         h: number;
         title: string;
         percent: string;
-        fgNode: data.FlameGraphNode;
+        fgNode: FlameGraphNode;
     };
 
     function calculateNodeRects(
@@ -91,40 +91,14 @@ export function loadFlameGraph(
         for (const node of nodes) {
             const { x, y, w, h } = node;
             ctx.fillStyle = "rgb(255, 125, 0)";
-            ctx.fillRect(x + 2, y + 2, w - 4, h - 4);
-
-            const textCanvas = drawTextCanvas(node);
-            ctx.drawImage(textCanvas, x + 4, y);
-
-            const edgePadding = 4;
-            const edgeWidth = 8;
-
-            const leftGradient = ctx.createLinearGradient(
-                x + 2 + edgePadding,
-                0,
-                x + 2 + edgeWidth,
-                0,
-            );
-            leftGradient.addColorStop(1, "rgba(255, 125, 0, 0.0)");
-            leftGradient.addColorStop(0, "rgba(255, 125, 0, 1.0)");
-            ctx.fillStyle = leftGradient;
-            ctx.fillRect(x + 2, y + 2, Math.min(edgeWidth, (w - 4) / 2), h - 4);
-
-            const rightGradient = ctx.createLinearGradient(
-                x + w - 2 - edgeWidth,
-                0,
-                x + w - 2 - edgePadding,
-                0,
-            );
-            rightGradient.addColorStop(0, "rgba(255, 125, 0, 0.0)");
-            rightGradient.addColorStop(1, "rgba(255, 125, 0, 1.0)");
-            ctx.fillStyle = rightGradient;
             ctx.fillRect(
-                x + w - 2 - Math.min(edgeWidth, (w - 4) / 2),
+                x + 2,
                 y + 2,
-                Math.min(edgeWidth, (w - 4) / 2),
+                w - 4,
                 h - 4,
             );
+            const textCanvas = drawTextCanvas(node);
+            ctx.drawImage(textCanvas, x + 4, y);
         }
         const tooltip = document.getElementById("flame-graph-tooltip")!;
 

web/public/src/index.ts

@@ -40,200 +40,6 @@ async function checkStatus(): Promise<"running" | "done"> {
     return "done";
 }
 
-function syntaxHighlight(code: string): string {
-    const colors = {
-        colorBackground: "#282828",
-        colorForeground: "#fbf1c7",
-        colorKeyword: "#fb4934",
-        colorIdentifier: "#83a598",
-        colorOperator: "#fe8019",
-        colorSpecial: "#fe8019",
-        colorType: "#fabd2f",
-        colorBoolean: "#d3869b",
-        colorNumber: "#d3869b",
-        colorString: "#b8bb26",
-        colorComment: "#928374",
-        colorFunction: "#b8bb26",
-        colorLineNumber: "#7c6f64",
-    } as const;
-
-    /*
-    Keyword = { link = "GruvboxRed" },
-    Identifier = { link = "GruvboxBlue" },
-    Operator = { fg = colors.orange, italic = config.italic.operators },
-    Special = { link = "GruvboxOrange" },
-    Type = { link = "GruvboxYellow" },
-    Boolean = { link = "GruvboxPurple" },
-    Number = { link = "GruvboxPurple" },
-    String = { fg = colors.green, italic = config.italic.strings },
-    Comment = { fg = colors.gray, italic = config.italic.comments },
-    Function = { link = "GruvboxGreenBold" },
-    */
-
-    let matches: {
-        index: number;
-        length: number;
-        color: string;
-        extra: string;
-    }[] = [];
-
-    function addMatches(color: string, re: RegExp, extra = "") {
-        for (const match of code.matchAll(re)) {
-            matches.push({
-                index: match.index,
-                length: match[1].length,
-                color,
-                extra,
-            });
-        }
-    }
-    function addKeywordMatches(color: string, keywords: string[]) {
-        addMatches(
-            color,
-            new RegExp(
-                `(?<!\\w)(${
-                    keywords.map((kw) => `(?:${kw})`).join("|")
-                })(?!\\w)`,
-                "g",
-            ),
-        );
-    }
-
-    for (let i = 0; i < code.length; ++i) {
-        if (code[i] !== '"') {
-            continue;
-        }
-        let last = code[i];
-        const index = i;
-        i += 1;
-        while (i < code.length && !(code[i] === '"' && last !== "\\")) {
-            last = code[i];
-            i += 1;
-        }
-        if (i < code.length) {
-            i += 1;
-        }
-        matches.push({
-            index,
-            length: i - index,
-            color: colors.colorString,
-            extra: "font-style: italic;",
-        });
-    }
-
-    {
-        let last = "";
-        for (let i = 0; i < code.length; ++i) {
-            if (last === "/" && code[i] === "/") {
-                const index = i - 1;
-                while (i < code.length && code[i] !== "\n") {
-                    i += 1;
-                }
-                matches.push({
-                    index,
-                    length: i - index,
-                    color: colors.colorComment,
-                    extra: "font-style: italic;",
-                });
-            }
-            last = code[i];
-        }
-    }
-
-    addKeywordMatches(
-        colors.colorKeyword,
-        [
-            "break",
-            "return",
-            "let",
-            "fn",
-            "if",
-            "else",
-            "struct",
-            "import",
-            "or",
-            "and",
-            "not",
-            "while",
-            "for",
-            "in",
-        ],
-    );
-    addKeywordMatches(colors.colorSpecial, ["null"]);
-    addKeywordMatches(colors.colorType, ["int", "string", "bool"]);
-    addKeywordMatches(colors.colorBoolean, ["false", "true"]);
-    addMatches(
-        colors.colorOperator,
-        new RegExp(
-            `(${
-                [
-                    "\\+=",
-                    "\\-=",
-                    "\\+",
-                    "\\->",
-                    "\\-",
-                    "\\*",
-                    "/",
-                    "==",
-                    "!=",
-                    "<=",
-                    ">=",
-                    "=",
-                    "<",
-                    ">",
-                    "\\.",
-                    "::<",
-                    "::",
-                    ":",
-                ].map((kw) => `(?:${kw})`).join("|")
-            })`,
-            "g",
-        ),
-    );
-    addMatches(
-        colors.colorNumber,
-        /(0|(?:[1-9][0-9]*)|(?:0[0-7]+)|(?:0x[0-9a-fA-F]+)|(?:0b[01]+))/g,
-    );
-    addMatches(
-        colors.colorFunction,
-        /([a-zA-Z_]\w*(?=\())/g,
-        "font-weight: 700;",
-    );
-    addMatches(colors.colorIdentifier, /([a-z_]\w*)/g);
-    addMatches(colors.colorType, /([A-Z_]\w*)/g);
-
-    matches = matches.reduce<typeof matches>(
-        (acc, match) =>
-            acc.find((m) => m.index === match.index) === undefined
-                ? (acc.push(match), acc)
-                : acc,
-        [],
-    );
-    matches.sort((a, b) => a.index - b.index);
-
-    let highlighted = "";
-    let i = 0;
-    for (const match of matches) {
-        if (match.index < i) {
-            continue;
-        }
-        while (i < match.index) {
-            highlighted += code[i];
-            i += 1;
-        }
-        const section = code.slice(match.index, match.index + match.length);
-        highlighted +=
-            `<span style="color: ${match.color};${match.extra}">${section}</span>`;
-        i += section.length;
-    }
-    while (i < code.length) {
-        highlighted += code[i];
-        i += 1;
-    }
-
-    return highlighted;
-}
-
 function sourceCode(view: Element, codeData: string) {
     const outerContainer = document.createElement("div");
     outerContainer.classList.add("code-container");
@@ -245,7 +51,7 @@ function sourceCode(view: Element, codeData: string) {
     const code = document.createElement("pre");
 
     code.classList.add("code-source");
-    code.innerHTML = syntaxHighlight(codeData);
+    code.innerText = codeData;
     innerContainer.append(lines, code);
     outerContainer.append(innerContainer);
     view.replaceChildren(outerContainer);

web/public/style.css

@@ -11,10 +11,6 @@
     --white: #ecebe9;
     --white-transparent: #ecebe9aa;
     --code-status: var(--white);
-
-    --code-bg: #282828;
-    --code-fg: #fbf1c7;
-    --code-linenr: #7c6f64;
 }
 
 * {
@@ -103,21 +99,11 @@ main #cover {
 #view .code-container {
     max-height: 100%;
     overflow: scroll;
-    background-color: var(--code-bg);
+    background-color: rgba(255, 255, 255, 0.1);
     padding: 0.5rem;
     border-radius: 0.5rem;
 }
 
-#view .code-container pre {
-    font-family: "Roboto Mono", monospace;
-    font-weight: 500;
-    color: var(--code-fg);
-}
-
-#view .code-container pre.code-lines {
-    color: var(--code-linenr);
-}
-
 #view .code-container.code-coverage {
     max-height: calc(100% - 103px);
 }
@@ -130,6 +116,7 @@ main #cover {
 }
 
 #view .code-lines {
+    color: var(--white-transparent);
     border-right: 1px solid currentcolor;
     padding-right: 0.5rem;
     margin: 0;