Skip to content

Refactor cloneExpression to reuse copyExpression #2079

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 4 commits into from
Sep 29, 2021
Merged

Refactor cloneExpression to reuse copyExpression #2079

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
d9e2bdb
Refactor cloneExpression to reuse copyExpression
dcodeIO Sep 20, 2021
15e4f36
add TODO
dcodeIO Sep 20, 2021
ffa5c91
add comments
dcodeIO Sep 20, 2021
b6226e4
add nop, data.drop, memory.size, rtt.canon
dcodeIO Sep 22, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 4 additions & 4 deletions src/compiler.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4645,8 +4645,8 @@ export class Compiler extends DiagnosticEmitter {
rightFlow.freeScopedLocals();
this.currentFlow = flow;

// simplify if cloning left without side effects is possible
if (expr = module.cloneExpression(leftExpr, true, 0)) {
// simplify if copying left is trivial
if (expr = module.tryCopyTrivialExpression(leftExpr)) {
expr = module.if(
this.makeIsTrueish(leftExpr, this.currentType, left),
rightExpr,
Expand Down Expand Up @@ -4709,8 +4709,8 @@ export class Compiler extends DiagnosticEmitter {
rightFlow.freeScopedLocals();
this.currentFlow = flow;

// simplify if cloning left without side effects is possible
if (expr = module.cloneExpression(leftExpr, true, 0)) {
// simplify if copying left is trivial
if (expr = module.tryCopyTrivialExpression(leftExpr)) {
expr = module.if(
this.makeIsTrueish(leftExpr, leftType, left),
expr,
Expand Down
112 changes: 9 additions & 103 deletions src/module.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2484,115 +2484,21 @@ export class Module {
return Relooper.create(this);
}

cloneExpression(
expr: ExpressionRef,
noSideEffects: bool = false,
maxDepth: i32 = i32.MAX_VALUE
): ExpressionRef { // currently supports side effect free expressions only
if (maxDepth < 0) return 0;
maxDepth -= 1;

var nested1: ExpressionRef,
nested2: ExpressionRef;

/** Makes a copy of a trivial expression (doesn't contain subexpressions). Returns `0` if non-trivial. */
tryCopyTrivialExpression(expr: ExpressionRef): ExpressionRef {
switch (binaryen._BinaryenExpressionGetId(expr)) {
case ExpressionId.Const: {
switch (<u32>binaryen._BinaryenExpressionGetType(expr)) {
case <u32>TypeRef.I32: {
return this.i32(binaryen._BinaryenConstGetValueI32(expr));
}
case <u32>TypeRef.I64: {
return this.i64(
binaryen._BinaryenConstGetValueI64Low(expr),
binaryen._BinaryenConstGetValueI64High(expr)
);
}
case <u32>TypeRef.F32: {
return this.f32(binaryen._BinaryenConstGetValueF32(expr));
}
case <u32>TypeRef.F64: {
return this.f64(binaryen._BinaryenConstGetValueF64(expr));
}
case <u32>TypeRef.V128: {
// TODO
return 0;
}
// Not possible to clone an externref as it is opaque
case <u32>TypeRef.Externref: {
return 0;
}
default: {
throw new Error("concrete type expected");
}
}
}
case ExpressionId.LocalGet: {
return binaryen._BinaryenLocalGet(this.ref,
binaryen._BinaryenLocalGetGetIndex(expr),
binaryen._BinaryenExpressionGetType(expr)
);
}
case ExpressionId.GlobalGet: {
let globalName = binaryen._BinaryenGlobalGetGetName(expr);
if (!globalName) break;
return binaryen._BinaryenGlobalGet(
this.ref, globalName, binaryen._BinaryenExpressionGetType(expr)
);
}
case ExpressionId.Load: {
if (!(nested1 = this.cloneExpression(
binaryen._BinaryenLoadGetPtr(expr), noSideEffects, maxDepth)
)) {
break;
}
return (
binaryen._BinaryenLoadIsAtomic(expr)
? binaryen._BinaryenAtomicLoad(this.ref,
binaryen._BinaryenLoadGetBytes(expr),
binaryen._BinaryenLoadGetOffset(expr),
binaryen._BinaryenExpressionGetType(expr),
nested1
)
: binaryen._BinaryenLoad(this.ref,
binaryen._BinaryenLoadGetBytes(expr),
binaryen._BinaryenLoadIsSigned(expr),
binaryen._BinaryenLoadGetOffset(expr),
binaryen._BinaryenLoadGetAlign(expr),
binaryen._BinaryenExpressionGetType(expr),
nested1
)
);
}
case ExpressionId.Unary: {
if (!(nested1 = this.cloneExpression(
binaryen._BinaryenUnaryGetValue(expr), noSideEffects, maxDepth)
)) {
break;
}
return binaryen._BinaryenUnary(
this.ref, binaryen._BinaryenUnaryGetOp(expr), nested1
);
}
case ExpressionId.Binary: {
if (!(nested1 = this.cloneExpression(
binaryen._BinaryenBinaryGetLeft(expr), noSideEffects, maxDepth)
)) {
break;
}
if (!(nested2 = this.cloneExpression(
binaryen._BinaryenBinaryGetRight(expr), noSideEffects, maxDepth)
)) {
break;
}
return binaryen._BinaryenBinary(
this.ref, binaryen._BinaryenBinaryGetOp(expr), nested1, nested2
);
}
case ExpressionId.LocalGet:
case ExpressionId.GlobalGet:
case ExpressionId.Const:
case ExpressionId.Unreachable:
case ExpressionId.RefNull: return this.copyExpression(expr);
}
return 0;
}

/** Makes a copy of any expression including all subexpressions. */
copyExpression(expr: ExpressionRef): ExpressionRef {
// TODO: Copy debug location as well (needs Binaryen support)
return binaryen._BinaryenExpressionCopy(expr, this.ref);
}

Expand Down