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loop

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This commit is contained in:
nora 2022-01-01 14:23:07 +01:00
parent a93412c3cd
commit 09deb07e85
4 changed files with 36 additions and 21 deletions
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30
src/compile.rs
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@ -87,6 +87,10 @@ impl<'ast, 'bc, 'gc> Compiler<'ast, 'bc, 'gc> {
};
self.blocks.push(global_block);
self.current_block = self.blocks.len() - 1;
// padding for backwards jumps
self.push_instr(Instr::Nop, StackChange::None, Span::dummy());
self.compile_stmts(&ast.0)?;
Ok(())
}
@ -169,7 +173,7 @@ impl<'ast, 'bc, 'gc> Compiler<'ast, 'bc, 'gc> {
let block = &mut self.blocks[self.current_block];
let next_index = block.code.len();
let jmp_pos = (next_index - 1) - jmp_idx;
block.code[jmp_idx] = Instr::JumpFalse(jmp_pos);
block.code[jmp_idx] = Instr::JumpFalse(jmp_pos as isize);
match else_part {
ElsePart::Else(block, _) => {
@ -183,19 +187,35 @@ impl<'ast, 'bc, 'gc> Compiler<'ast, 'bc, 'gc> {
let block = &mut self.blocks[self.current_block];
let next_index = block.code.len();
let jmp_pos = (next_index - else_skip_jmp_idx) - 1;
block.code[else_skip_jmp_idx] = Instr::Jmp(jmp_pos);
block.code[else_skip_jmp_idx] = Instr::Jmp(jmp_pos as isize);
} else {
let block = &mut self.blocks[self.current_block];
let next_index = block.code.len();
let jmp_pos = (next_index - 1) - jmp_idx;
block.code[jmp_idx] = Instr::JumpFalse(jmp_pos);
block.code[jmp_idx] = Instr::JumpFalse(jmp_pos as isize);
}
Ok(())
}
fn compile_loop(&mut self, _: &Block, _: Span) -> CResult<()> {
todo!()
fn compile_loop(&mut self, ast_block: &'ast Block, span: Span) -> CResult<()> {
/*
╭>0 // do things
╰─1 JMP (-2),
*/
let block = &self.blocks[self.current_block];
let first_stmt_idx = block.code.len() as isize;
self.compile_block(ast_block)?;
let block = &self.blocks[self.current_block];
let jmp_index = block.code.len() as isize;
let jmp_offset = -(jmp_index - first_stmt_idx + 1);
self.push_instr(Instr::Jmp(jmp_offset), StackChange::None, span);
Ok(())
}
fn compile_while(&mut self, _: &WhileStmt) -> CResult<()> {