v8/test/mjsunit/switch.js

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// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --allow-natives-syntax
function f0() {
switch (0) {
// switch deliberately left empty
}
}
f0(); // no errors
function f1(x) {
switch (x) {
default: return "f1";
}
return "foo";
}
assertEquals("f1", f1(0), "default-switch.0");
assertEquals("f1", f1(1), "default-switch.1");
function f2(x) {
var r;
switch (x) {
case 0:
r = "zero";
break;
case 1:
r = "one";
break;
case 2:
r = "two";
break;
case 3:
r = "three";
break;
default:
r = "default";
}
return r;
}
assertEquals("zero", f2(0), "0-1-switch.0");
assertEquals("one", f2(1), "0-1-switch.1");
assertEquals("default", f2(7), "0-1-switch.2");
assertEquals("default", f2(-1), "0-1-switch.-1");
assertEquals("default", f2(NaN), "0-1-switch.NaN");
assertEquals("default", f2(Math.pow(2,34)), "0-1-switch.largeNum");
assertEquals("default", f2("0"), "0-1-switch.string");
assertEquals("default", f2(false), "0-1-switch.bool");
assertEquals("default", f2(null), "0-1-switch.null");
assertEquals("default", f2(undefined), "0-1-switch.undef");
assertEquals("default", f2(new Number(2)), "0-1-switch.undef");
assertEquals("default", f2({valueOf: function(){return 2; }}), "0-1-switch.obj");
function f3(x, c) {
var r = 0;
switch (x) {
default:
r = "default";
break;
case c:
r = "value is c = " + c;
break;
case 2:
r = "two";
break;
case -5:
r = "minus 5";
break;
case 9:
r = "nine";
break;
}
return r;
}
assertEquals("two", f3(2,0), "value-switch.2-0");
assertEquals("minus 5", f3(-5,0), "value-switch.-5-0");
assertEquals("nine", f3(9,0), "value-switch.9-0");
assertEquals("value is c = 0", f3(0,0), "value-switch.0-0");
assertEquals("value is c = 2", f3(2,2), "value-switch.2-2");
assertEquals("default", f3(7,0), "value-switch.7-0");
function f4(x) {
switch(x) {
case 0:
x++;
default:
x++;
case 2:
x++;
}
return x;
}
assertEquals(3, f4(0), "fallthrough-switch.0");
assertEquals(3, f4(1), "fallthrough-switch.1");
assertEquals(3, f4(2), "fallthrough-switch.2");
assertEquals(5, f4(3), "fallthrough-switch.3");
function f4_string(tag, x) {
switch(tag) {
case 'zero':
x++;
case 'two':
x++;
}
return x;
}
// Symbols
assertEquals(2, f4_string('zero', 0), "fallthrough-string-switch.0");
assertEquals(1, f4_string('one', 1), "fallthrough-string-switch.1");
assertEquals(3, f4_string('two', 2), "fallthrough-string-switch.2");
// Strings
assertEquals(2, f4_string('_zero'.slice(1), 0), "fallthrough-string-switch.3");
assertEquals(1, f4_string('_one'.slice(1), 1), "fallthrough-string-switch.4");
assertEquals(3, f4_string('_two'.slice(1), 2), "fallthrough-string-switch.5");
// Oddball
assertEquals(3, f4_string(null, 3), "fallthrough-string-switch.6");
// Test for regression
function regress_string(value) {
var json = 1;
switch (typeof value) {
case 'object':
break;
default:
}
return json;
};
assertEquals(1, regress_string('object'), 'regression-string');
function f5(x) {
switch(x) {
case -2: return true;
case -1: return false;
case 0: return true;
case 2: return false;
default: return 42;
}
}
assertTrue(f5(-2), "negcase.-2");
assertFalse(f5(-1), "negcase.-1");
assertTrue(f5(0), "negcase.-0");
assertEquals(42, f5(1), "negcase.1");
assertFalse(f5(2), "negcase.2");
function f6(N) {
// long enough case that code buffer grows during code-generation
var res = 0;
for(var i = 0; i < N; i++) {
switch(i & 0x3f) {
case 0: res += 0; break;
case 1: res += 1; break;
case 2: res += 2; break;
case 3: res += 3; break;
case 4: res += 4; break;
case 5: res += 5; break;
case 6: res += 6; break;
case 7: res += 7; break;
case 8: res += 8; break;
case 9: res += 9; break;
case 10: res += 10; break;
case 11: res += 11; break;
case 12: res += 12; break;
case 13: res += 13; break;
case 14: res += 14; break;
case 15: res += 15; break;
case 16: res += 16; break;
case 17: res += 17; break;
case 18: res += 18; break;
case 19: res += 19; break;
case 20: res += 20; break;
case 21: res += 21; break;
case 22: res += 22; break;
case 23: res += 23; break;
case 24: res += 24; break;
case 25: res += 25; break;
case 26: res += 26; break;
case 27: res += 27; break;
case 28: res += 28; break;
case 29: res += 29; break;
case 30: res += 30; break;
case 31: res += 31; break;
case 32: res += 32; break;
case 33: res += 33; break;
case 34: res += 34; break;
case 35: res += 35; break;
case 36: res += 36; break;
case 37: res += 37; break;
case 38: res += 38; break;
case 39: res += 39; break;
case 40: res += 40; break;
case 41: res += 41; break;
case 42: res += 42; break;
case 43: res += 43; break;
case 44: res += 44; break;
case 45: res += 45; break;
case 46: res += 46; break;
case 47: res += 47; break;
case 48: res += 48; break;
case 49: res += 49; break;
case 50: res += 50; break;
case 51: res += 51; break;
case 52: res += 52; break;
case 53: res += 53; break;
case 54: res += 54; break;
case 55: res += 55; break;
case 56: res += 56; break;
case 57: res += 57; break;
case 58: res += 58; break;
case 59: res += 59; break;
case 60: res += 60; break;
case 61: res += 61; break;
case 62: res += 62; break;
case 63: res += 63; break;
case 64: break;
default: break;
}
}
return res;
}
assertEquals(190, f6(20), "largeSwitch.20");
assertEquals(2016, f6(64), "largeSwitch.64");
assertEquals(4032, f6(128), "largeSwitch.128");
assertEquals(4222, f6(148), "largeSwitch.148");
function f7(value) {
switch (value) {
case 0: return "0";
case -0: return "-0";
case 1: case 2: case 3: case 4: // Dummy fillers.
}
switch (value) {
case 0x3fffffff: return "MaxSmi";
case 0x3ffffffe:
case 0x3ffffffd:
case 0x3ffffffc:
case 0x3ffffffb:
case 0x3ffffffa: // Dummy fillers
}
switch (value) {
case -0x40000000: return "MinSmi";
case -0x3fffffff:
case -0x3ffffffe:
case -0x3ffffffd:
case -0x3ffffffc:
case -0x3ffffffb: // Dummy fillers
}
switch (value) {
case 10: return "A";
case 11:
case 12:
case 13:
case 14:
case 15: // Dummy fillers
}
return "default";
}
assertEquals("default", f7(0.1), "0-1-switch.double-0.1");
assertEquals("0", f7(-0), "0-1-switch.double-neg0");
assertEquals("MaxSmi", f7((1<<30)-1), "0-1-switch.maxsmi");
assertEquals("MinSmi", f7(-(1<<30)), "0-1-switch.minsmi");
assertEquals("default", f7(1<<30), "0-1-switch.maxsmi++");
assertEquals("default", f7(-(1<<30)-1), "0-1-switch.minsmi--");
assertEquals("A", f7((170/16)-(170%16/16)), "0-1-switch.heapnum");
function makeVeryLong(length) {
var res = "(function () {\n" +
" var res = 0;\n" +
" for (var i = 0; i <= " + length + "; i++) {\n" +
" switch(i) {\n";
for (var i = 0; i < length; i++) {
res += " case " + i + ": res += 2; break;\n";
}
res += " default: res += 1;\n" +
" }\n" +
" }\n" +
" return res;\n" +
"})";
return eval(res);
}
var verylong_size = 1000;
var verylong = makeVeryLong(verylong_size);
assertEquals(verylong_size * 2 + 1, verylong());
//
// Test suite below aims to cover all possible combinations of following:
//
// clauses | tags | type feedback | optimization
// =========================================================
// strings | symbol | all | on
// smis | string | target | off
// mixed | oddball | non-target |
// | smis | none |
// | heapnum | |
// =========================================================
// Function-with-switch generator
var test_id = 0,
clause_values = {
string: ['abc', 'def', 'ghi', 'jkl'],
smi: [1, 2, 3, 4],
mixed: ['abc', 1, 'def', 2, 'ghi', 3, 'jkl', 4]
};
function switch_gen(clause_type, feedback, optimize) {
var values = clause_values[clause_type];
function opt(fn) {
if (feedback === 'all') {
values.forEach(fn);
} else if (Array.isArray(feedback)) {
// Non-target
values.filter(function(v) {
return feedback.indexOf(v) === -1;
}).forEach(fn);
} else if (feedback !== undefined) {
// Target
fn(feedback);
} else {
// None
}
if (optimize) %OptimizeFunctionOnNextCall(fn);
return fn;
};
return opt(new Function(
'tag',
'"' + (test_id++) + '";' +
'switch(tag) {' +
values.map(function(value) {
return 'case ' + JSON.stringify(value) + ': return' +
JSON.stringify('ok-' + value);
}).join(';') +
'}'
));
};
function test_switch(clause_type, test_type, feedback, optimize) {
var pairs = [],
fn = switch_gen(clause_type, feedback, optimize);
if (Array.isArray(test_type)) {
pairs = test_type.map(function(v) {
return {
value: v,
expected: 'ok-' + v
};
});
} else if (test_type === 'symbols') {
pairs = clause_values.string.map(function(v) {
return {
value: v,
expected: clause_type !== 'smi' ? 'ok-' + v : undefined
};
});
} else if (test_type === 'strings') {
pairs = clause_values.string.map(function(v) {
return {
value: ('%%' + v).slice(2),
expected: clause_type !== 'smi' ? 'ok-' + v : undefined
};
});
} else if (test_type === 'oddball') {
pairs = [
{ value: null, expected: undefined },
{ value: NaN, expected: undefined },
{ value: undefined, expected: undefined }
];
} else if (test_type === 'smi') {
pairs = clause_values.smi.map(function(v) {
return {
value: v,
expected: clause_type !== 'string' ? 'ok-' + v : undefined
};
});
} else if (test_type === 'heapnum') {
pairs = clause_values.smi.map(function(v) {
return {
value: ((v * 17)/16) - ((v*17)%16/16),
expected: clause_type !== 'string' ? 'ok-' + v : undefined
};
});
}
pairs.forEach(function(pair) {
assertEquals(fn(pair.value), pair.expected);
});
};
// test_switch(clause_type, test_type, feedback, optimize);
function test_switches(opt) {
var test_types = ['symbols', 'strings', 'oddball', 'smi', 'heapnum'];
function test(clause_type) {
var values = clause_values[clause_type];
test_types.forEach(function(test_type) {
test_switch(clause_type, test_type, 'all', opt);
test_switch(clause_type, test_type, 'none', opt);
// Targeting specific clause feedback
values.forEach(function(value) {
test_switch(clause_type, test_type, [value], value, opt);
test_switch(clause_type, test_type, value, value, opt);
});
});
};
test('string');
test('smi');
test('mixed');
};
test_switches(false);
test_switches(true);