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Statically eliminate unnecessary branches in generic contexts

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In order to use the new compile time type checks in generics, untaken branches must be skipped because these might be invalid.
This commit is contained in:
dcodeIO
2018-03-17 14:40:58 +01:00
parent 2ed9fac171
commit 83e96892f2
18 changed files with 818 additions and 1769 deletions
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72
src/compiler.ts
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@ -1331,19 +1331,21 @@ export class Compiler extends DiagnosticEmitter {
flow.continueLabel = previousContinueLabel;
var module = this.module;
var condition = makeIsTrueish(
var condExpr = makeIsTrueish(
this.compileExpression(statement.condition, Type.i32, ConversionKind.NONE),
this.currentType,
module
);
// No need to eliminate the condition in generic contexts as the statement is executed anyway.
this.currentFunction.leaveBreakContext();
return module.createBlock(breakLabel, [
module.createLoop(continueLabel,
module.createBlock(null, [
body,
module.createBreak(continueLabel, condition)
module.createBreak(continueLabel, condExpr)
], NativeType.None))
], NativeType.None);
}
@ -1418,26 +1420,44 @@ export class Compiler extends DiagnosticEmitter {
compileIfStatement(statement: IfStatement): ExpressionRef {
var module = this.module;
var currentFunction = this.currentFunction;
var ifTrue = statement.ifTrue;
var ifFalse = statement.ifFalse;
// The condition doesn't initiate a branch yet
var condition = makeIsTrueish(
var condExpr = makeIsTrueish(
this.compileExpression(statement.condition, Type.i32, ConversionKind.NONE),
this.currentType,
module
);
// Eliminate unnecesssary branches in generic contexts if the condition is constant
if (
this.currentFunction.isAny(CommonFlags.GENERIC | CommonFlags.GENERIC_CONTEXT) &&
_BinaryenExpressionGetId(condExpr = this.precomputeExpressionRef(condExpr)) == ExpressionId.Const &&
_BinaryenExpressionGetType(condExpr) == NativeType.I32
) {
let ret: ExpressionRef;
if (_BinaryenConstGetValueI32(condExpr)) {
ret = this.compileStatement(ifTrue);
} else if (ifFalse) {
ret = this.compileStatement(ifFalse);
} else {
ret = module.createNop();
}
return ret;
}
// Each arm initiates a branch
var currentFunction = this.currentFunction;
var flow = currentFunction.flow.enterBranchOrScope();
currentFunction.flow = flow;
var ifTrueExpr = this.compileStatement(statement.ifTrue);
var ifTrueExpr = this.compileStatement(ifTrue);
var ifTrueReturns = flow.is(FlowFlags.RETURNS);
flow = flow.leaveBranchOrScope();
currentFunction.flow = flow;
var ifFalseExpr: ExpressionRef = 0;
var ifFalseReturns = false;
var ifFalse = statement.ifFalse;
if (ifFalse) {
flow = flow.enterBranchOrScope();
currentFunction.flow = flow;
@ -1449,7 +1469,7 @@ export class Compiler extends DiagnosticEmitter {
if (ifTrueReturns && ifFalseReturns) { // not necessary to append a hint
flow.set(FlowFlags.RETURNS);
}
return module.createIf(condition, ifTrueExpr, ifFalseExpr);
return module.createIf(condExpr, ifTrueExpr, ifFalseExpr);
}
compileReturnStatement(statement: ReturnStatement): ExpressionRef {
@ -1724,12 +1744,23 @@ export class Compiler extends DiagnosticEmitter {
var module = this.module;
// The condition does not yet initialize a branch
var condition = makeIsTrueish(
var condExpr = makeIsTrueish(
this.compileExpression(statement.condition, Type.i32, ConversionKind.NONE),
this.currentType,
module
);
// Eliminate unnecesssary loops in generic contexts if the condition is constant
if (
this.currentFunction.isAny(CommonFlags.GENERIC | CommonFlags.GENERIC_CONTEXT) &&
_BinaryenExpressionGetId(condExpr = this.precomputeExpressionRef(condExpr)) == ExpressionId.Const &&
_BinaryenExpressionGetType(condExpr) == NativeType.I32
) {
if (!_BinaryenConstGetValueI32(condExpr)) {
return module.createNop();
}
}
// Statements initiate a new branch with its own break context
var currentFunction = this.currentFunction;
var label = currentFunction.enterBreakContext();
@ -1750,7 +1781,7 @@ export class Compiler extends DiagnosticEmitter {
var expr = module.createBlock(breakLabel, [
module.createLoop(continueLabel,
module.createIf(condition, module.createBlock(null, [
module.createIf(condExpr, module.createBlock(null, [
body,
module.createBreak(continueLabel)
], NativeType.None))
@ -4952,14 +4983,29 @@ export class Compiler extends DiagnosticEmitter {
}
compileTernaryExpression(expression: TernaryExpression, contextualType: Type): ExpressionRef {
var condition = makeIsTrueish(
var ifThen = expression.ifThen;
var ifElse = expression.ifElse;
var condExpr = makeIsTrueish(
this.compileExpression(expression.condition, Type.u32, ConversionKind.NONE),
this.currentType,
this.module
);
var ifThen = this.compileExpression(expression.ifThen, contextualType);
var ifElse = this.compileExpression(expression.ifElse, contextualType);
return this.module.createIf(condition, ifThen, ifElse);
// Eliminate unnecesssary branches in generic contexts if the condition is constant
if (
this.currentFunction.isAny(CommonFlags.GENERIC | CommonFlags.GENERIC_CONTEXT) &&
_BinaryenExpressionGetId(condExpr = this.precomputeExpressionRef(condExpr)) == ExpressionId.Const &&
_BinaryenExpressionGetType(condExpr) == NativeType.I32
) {
return _BinaryenConstGetValueI32(condExpr)
? this.compileExpression(ifThen, contextualType)
: this.compileExpression(ifElse, contextualType);
}
var ifThenExpr = this.compileExpression(ifThen, contextualType);
var ifElseExpr = this.compileExpression(ifElse, contextualType);
return this.module.createIf(condExpr, ifThenExpr, ifElseExpr);
}
compileUnaryPostfixExpression(expression: UnaryPostfixExpression, contextualType: Type): ExpressionRef {