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in-place dead_code

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alexlamsl 2017-06-16 15:16:33 +08:00
parent bfbac53762
commit c2174d06b2
1 changed files with 28 additions and 26 deletions
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54
lib/compress.js
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@ -670,7 +670,7 @@ merge(Compressor.prototype, {
CHANGED = false; CHANGED = false;
statements = eliminate_spurious_blocks(statements); statements = eliminate_spurious_blocks(statements);
if (compressor.option("dead_code")) { if (compressor.option("dead_code")) {
statements = eliminate_dead_code(statements, compressor); eliminate_dead_code(statements, compressor);
} }
if (compressor.option("if_return")) { if (compressor.option("if_return")) {
statements = handle_if_return(statements, compressor); statements = handle_if_return(statements, compressor);
@ -1062,35 +1062,37 @@ merge(Compressor.prototype, {
}; };
function eliminate_dead_code(statements, compressor) { function eliminate_dead_code(statements, compressor) {
var has_quit = false; var has_quit;
var orig = statements.length;
var self = compressor.self(); var self = compressor.self();
statements = statements.reduce(function(a, stat){ for (var i = 0, n = 0, len = statements.length; i < len; i++) {
if (has_quit) { var stat = statements[i];
extract_declarations_from_unreachable_code(compressor, stat, a); if (stat instanceof AST_LoopControl) {
} else { var lct = compressor.loopcontrol_target(stat);
if (stat instanceof AST_LoopControl) { if (stat instanceof AST_Break
var lct = compressor.loopcontrol_target(stat); && !(lct instanceof AST_IterationStatement)
if ((stat instanceof AST_Break && loop_body(lct) === self
&& !(lct instanceof AST_IterationStatement) || stat instanceof AST_Continue
&& loop_body(lct) === self) || (stat instanceof AST_Continue && loop_body(lct) === self) {
&& loop_body(lct) === self)) { if (stat.label) {
if (stat.label) { remove(stat.label.thedef.references, stat);
remove(stat.label.thedef.references, stat);
}
} else {
a.push(stat);
} }
} else { } else {
a.push(stat); statements[n++] = stat;
} }
if (aborts(stat)) has_quit = true; } else {
statements[n++] = stat;
} }
return a; if (aborts(stat)) {
}, []); has_quit = statements.slice(i + 1);
CHANGED = statements.length != orig; break;
return statements; }
}; }
statements.length = n;
CHANGED = n != len;
if (has_quit) has_quit.forEach(function(stat) {
extract_declarations_from_unreachable_code(compressor, stat, statements);
});
}
function sequencesize(statements, compressor) { function sequencesize(statements, compressor) {
if (statements.length < 2) return; if (statements.length < 2) return;
@ -1117,7 +1119,7 @@ merge(Compressor.prototype, {
statements.length = n; statements.length = n;
sequencesize_2(statements, compressor); sequencesize_2(statements, compressor);
CHANGED = statements.length != len; CHANGED = statements.length != len;
}; }
function sequencesize_2(statements, compressor) { function sequencesize_2(statements, compressor) {
function cons_seq(right) { function cons_seq(right) {