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#include "stdafx.h"
#include "Breakable.h"
#include "Compiler/Exception.h"
namespace storm {
namespace bs {
Breakable::Breakable(SrcPos pos, Scope scope) : Block(pos, scope) {}
Breakable::Breakable(SrcPos pos, Block *parent) : Block(pos, parent) {}
Breakable::To::To(code::Label lbl, code::Block block) : label(lbl), block(block) {}
static MAYBE(Breakable *) findBreakable(Block *block) {
BlockLookup *lookup = block->lookup;
while (lookup) {
Block *block = lookup->block;
if (Breakable *b = as<Breakable>(block))
return b;
lookup = as<BlockLookup>(lookup->parent());
}
return null;
}
Break::Break(SrcPos pos, Block *parent) : Expr(pos) {
if (!(breakFrom = findBreakable(parent)))
throw new (this) SyntaxError(pos, S("Nothing to break from here. Use break inside loops."));
breakFrom->willBreak();
}
ExprResult Break::result() {
return noReturn();
}
void Break::code(CodeGen *state, CodeResult *r) {
Breakable::To to = breakFrom->breakTo();
*state->l << jmpBlock(to.label, to.block);
}
void Break::toS(StrBuf *to) const {
*to << S("break");
}
Bool Break::isolate() {
return false;
}
Continue::Continue(SrcPos pos, Block *parent) : Expr(pos) {
if (!(continueIn = findBreakable(parent)))
throw new (this) SyntaxError(pos, S("Nothing to continue from here. Use continue inside loops."));
continueIn->willContinue();
}
ExprResult Continue::result() {
return noReturn();
}
void Continue::code(CodeGen *state, CodeResult *r) {
Breakable::To to = continueIn->continueTo();
*state->l << jmpBlock(to.label, to.block);
}
void Continue::toS(StrBuf *to) const {
*to << S("continue");
}
Bool Continue::isolate() {
return false;
}
}
}
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