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index.js
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index.js
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// petard, an llvm library
ffi = require('ffi');
// load the native module
var petard = require('bindings')('petard');
// basic type shortcuts
petard.type = {
void: petard.getVoidTy(),
i1: petard.getIntTy(1),
i8: petard.getIntTy(8),
i16: petard.getIntTy(16),
i32: petard.getIntTy(32),
i64: petard.getIntTy(64),
f16: petard.getFloatTy(16),
f32: petard.getFloatTy(32),
f64: petard.getFloatTy(64),
arrayOf: petard.getArrayTy,
vectorOf: petard.getVectorTy,
structOf: petard.getStructTy,
pointerTo: petard.getPointerTy
};
// some built-in macros to help
// attach a function to the builder prototypes
function attach(name, action) {
petard.Builder.prototype[name] = action;
petard.FunctionBuilder.prototype[name] = action;
}
// structured if statement helper
var ifimpl = function If(cond) {
var merge = this.splitBlock("merge");
var ifTrue = this.createBlock("then");
ifTrue.insertAfter();
ifTrue.br(merge);
ifTrue.insertBefore();
var ifFalse = this.createBlock("else");
ifFalse.insertAfter();
ifFalse.br(merge);
ifFalse.insertBefore();
this.br(cond, ifTrue, ifFalse);
this.useBlock(merge);
return {
"then": ifTrue,
"else": ifFalse
};
};
attach("if", ifimpl);
// structured while statement helper
var whileimpl = function While(condFn) {
var merge = this.splitBlock("after");
var condCheck = this.createBlock("cond");
var body = this.createBlock("body");
body.insertAfter();
body.br(condCheck);
body.insertBefore();
var cond = condFn(condCheck);
condCheck.br(cond, body, merge);
this.br(condCheck);
this.useBlock(merge);
return body;
};
attach("while", whileimpl);
// structured switch statement helper
var chooseimpl = function Choose(cond) {
var that = this;
var merge = this.splitBlock("after");
var defaultBlock = this.createBlock("default");
defaultBlock.insertAfter();
defaultBlock.br(merge);
defaultBlock.insertBefore();
var sw = this.switch(cond, defaultBlock);
this.useBlock(merge);
return {
defaultCase: defaultBlock,
addCase: function addCase(onVal) {
var caseBlock = that.createBlock("case" + onVal);
caseBlock.insertAfter();
caseBlock.br(merge);
caseBlock.insertBefore();
sw.addCase(onVal, caseBlock);
return caseBlock;
}
};
};
attach("choose", chooseimpl);
// helper to load a jitted function
var origMakeFn = petard.CodeUnit.prototype.makeFunction;
petard.CodeUnit.prototype.makeFunction = function() {
var fn = origMakeFn.apply(this, arguments);
fn.codeUnit = this;
return fn;
};
function convertToRefType(ty) {
if (ty.isVoidType()) return 'void';
if (ty.isIntType()) return 'int';
if (ty.isFloatType()) return 'float';
if (ty.isArrayType() && ty.element.isIntType() && ty.element.bitwidth == 8) return 'string';
if (ty.isPointerType() && ty.pointee.isIntType() && ty.pointee.bitwidth == 8) return 'string';
if (ty.isFunctionType()) {
var ret = convertToRefType(ty.returns);
var params = ty.parameters.map(function (p) { return convertToRefType(p); });
if (!ret) return;
if (!params.every(function (p) { return !!p; })) return;
return [ret, params];
}
}
var jitimpl = function JITFunction() {
fnty = convertToRefType(this.type);
if (!fnty) return;
fn = this.codeUnit.jitFunction(this);
return ffi.ForeignFunction(fn, fnty[0], fnty[1]);
};
attach("jitCompile", jitimpl);
// export everything
module.exports = petard;