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Implement some kind of if/else

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This commit is contained in:
Sofia 2024-08-25 23:17:52 +03:00
parent 8defa39b31
commit e21f47e34b
3 changed files with 106 additions and 37 deletions
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2
src/ast.rs
View File

@ -214,7 +214,7 @@ impl Parse for FunctionCallExpression {
}
#[derive(Debug, Clone)]
pub struct IfExpression(Expression, pub Block, pub TokenRange);
pub struct IfExpression(pub Expression, pub Block, pub TokenRange);
impl Parse for IfExpression {
fn parse(mut stream: TokenStream) -> Result<Self, Error> {

93
src/codegen/llvm.rs
View File

@ -1,3 +1,4 @@
use std::borrow::BorrowMut;
use std::ffi::{CStr, CString};
use std::mem;
@ -21,6 +22,7 @@ pub enum Error {
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum IRType {
I32,
Boolean,
}
impl IRType {
@ -29,6 +31,7 @@ impl IRType {
unsafe {
return match self {
I32 => LLVMInt32TypeInContext(context.context),
Boolean => LLVMInt1TypeInContext(context.context),
};
}
}
@ -140,26 +143,20 @@ impl<'a, 'b> IRFunction<'a, 'b> {
}
}
}
pub fn attach(&mut self, block: IRBlock) {
unsafe { LLVMAppendExistingBasicBlock(self.value, block.blockref) }
}
}
pub struct IRBlock<'a, 'b> {
pub module: &'b IRModule<'a>,
pub struct IRBlock<'a, 'b, 'c> {
pub function: &'c IRFunction<'a, 'b>,
blockref: *mut LLVMBasicBlock,
}
impl<'a, 'b, 'c> IRBlock<'a, 'b> {
pub fn new(module: &'b IRModule<'a>) -> IRBlock<'a, 'b> {
impl<'a, 'b, 'c> IRBlock<'a, 'b, 'c> {
pub fn new(function: &'c IRFunction<'a, 'b>, name: &CStr) -> IRBlock<'a, 'b, 'c> {
unsafe {
let blockref = LLVMCreateBasicBlockInContext(
module.context.context,
into_cstring("entryblock").as_ptr(),
);
let blockref =
LLVMCreateBasicBlockInContext(function.module.context.context, name.as_ptr());
IRBlock { module, blockref }
IRBlock { function, blockref }
}
}
@ -169,12 +166,12 @@ impl<'a, 'b, 'c> IRBlock<'a, 'b> {
IRValue(rhs_t, rhs_v): IRValue,
) -> Result<IRValue, Error> {
unsafe {
LLVMPositionBuilderAtEnd(self.module.context.builder, self.blockref);
LLVMPositionBuilderAtEnd(self.function.module.context.builder, self.blockref);
if lhs_t == rhs_t {
Ok(IRValue(
lhs_t,
LLVMBuildAdd(
self.module.context.builder,
self.function.module.context.builder,
lhs_v,
rhs_v,
c"tmpadd".as_ptr(),
@ -192,12 +189,12 @@ impl<'a, 'b, 'c> IRBlock<'a, 'b> {
IRValue(rhs_t, rhs_v): IRValue,
) -> Result<IRValue, Error> {
unsafe {
LLVMPositionBuilderAtEnd(self.module.context.builder, self.blockref);
LLVMPositionBuilderAtEnd(self.function.module.context.builder, self.blockref);
if lhs_t == rhs_t {
Ok(IRValue(
lhs_t,
LLVMBuildMul(
self.module.context.builder,
self.function.module.context.builder,
lhs_v,
rhs_v,
c"tmpadd".as_ptr(),
@ -209,14 +206,70 @@ impl<'a, 'b, 'c> IRBlock<'a, 'b> {
}
}
pub fn less_than(
&mut self,
IRValue(lhs_t, lhs_v): IRValue,
IRValue(rhs_t, rhs_v): IRValue,
) -> Result<IRValue, Error> {
unsafe {
LLVMPositionBuilderAtEnd(self.function.module.context.builder, self.blockref);
if lhs_t == rhs_t {
Ok(IRValue(
IRType::Boolean,
LLVMBuildICmp(
self.function.module.context.builder,
llvm_sys::LLVMIntPredicate::LLVMIntULT,
lhs_v,
rhs_v,
c"IntULT".as_ptr(),
),
))
} else {
Err(Error::TypeMismatch(lhs_t, rhs_t))
}
}
}
pub fn add_return(&mut self, value: Option<IRValue>) {
unsafe {
LLVMPositionBuilderAtEnd(self.module.context.builder, self.blockref);
LLVMPositionBuilderAtEnd(self.function.module.context.builder, self.blockref);
if let Some(IRValue(_, value)) = value {
LLVMBuildRet(self.module.context.builder, value);
LLVMBuildRet(self.function.module.context.builder, value);
} else {
LLVMBuildRetVoid(self.module.context.builder);
LLVMBuildRetVoid(self.function.module.context.builder);
}
}
}
pub fn branch(
&mut self,
IRValue(_, condition): IRValue,
then_block: &mut IRBlock,
else_block: &mut IRBlock,
) {
unsafe {
LLVMPositionBuilderAtEnd(self.function.module.context.builder, self.blockref);
LLVMBuildCondBr(
self.function.module.context.builder,
condition,
then_block.blockref,
else_block.blockref,
);
}
}
pub fn move_into(&mut self, block: &mut IRBlock) {
unsafe {
LLVMPositionBuilderAtEnd(self.function.module.context.builder, self.blockref);
LLVMBuildBr(self.function.module.context.builder, block.blockref);
}
}
}
impl<'a, 'b, 'c> Drop for IRBlock<'a, 'b, 'c> {
fn drop(&mut self) {
unsafe {
LLVMAppendExistingBasicBlock(self.function.value, self.blockref);
}
}
}

44
src/codegen/mod.rs
View File

@ -6,8 +6,8 @@ use llvm::{Error, IRBlock, IRContext, IRFunction, IRModule, IRValue};
use crate::{
ast::{
Block, BlockLevelStatement, Expression, ExpressionKind, FunctionDefinition, LetStatement,
ReturnType,
Block, BlockLevelStatement, Expression, ExpressionKind, FunctionDefinition, IfExpression,
LetStatement, ReturnType,
},
TopLevelStatement,
};
@ -41,13 +41,11 @@ impl TopLevelStatement {
impl FunctionDefinition {
fn codegen(&self, scope: &mut ScopeData, module: &mut IRModule) {
let FunctionDefinition(signature, block, _) = self;
let mut ir_function = IRFunction::new(&signature.name, module);
let ir_function = IRFunction::new(&signature.name, module);
let ir_block = IRBlock::new(&module);
let ir_block = IRBlock::new(&ir_function, c"entry");
let mut scope = scope.inner(ir_block);
block.codegen(&mut scope);
ir_function.attach(scope.block);
}
}
@ -87,7 +85,7 @@ impl Expression {
use ExpressionKind::*;
match kind {
Literal(lit) => IRValue::from_literal(lit, &mut scope.block.module),
Literal(lit) => IRValue::from_literal(lit, &scope.block.function.module),
VariableName(v) => scope.data.fetch(v),
Binop(op, lhs, rhs) => {
let lhs = lhs.codegen(scope);
@ -96,10 +94,28 @@ impl Expression {
match op {
Add => scope.block.add(lhs, rhs).unwrap(),
Mult => scope.block.mult(lhs, rhs).unwrap(),
LessThan => scope.block.less_than(lhs, rhs).unwrap(),
_ => panic!("operator not supported: {:?}", op),
}
}
_ => panic!("expression type not supported"),
IfExpr(ifx) => {
let IfExpression(expr, block, _) = ifx.as_ref();
let condition = expr.codegen(scope);
let mut then = IRBlock::new(scope.block.function, c"then");
let mut after = IRBlock::new(scope.block.function, c"merge");
scope.block.branch(condition, &mut then, &mut after);
scope.block = after;
let mut inner = scope.inner(then);
block.codegen(&mut inner);
inner.block.move_into(&mut scope.block);
IRValue::from_literal(&crate::ast::Literal::I32(1), scope.block.function.module)
}
BlockExpr(_) => panic!("block expr not supported"),
FunctionCall(_) => panic!("function call expr not supported"),
}
}
}
@ -116,11 +132,11 @@ impl ScopeData {
}
}
fn with_block<'a, 'b>(self, block: IRBlock<'a, 'b>) -> Scope<'a, 'b> {
fn with_block<'a, 'b, 'c>(self, block: IRBlock<'a, 'b, 'c>) -> Scope<'a, 'b, 'c> {
Scope { data: self, block }
}
fn inner<'a, 'b>(&self, block: IRBlock<'a, 'b>) -> Scope<'a, 'b> {
fn inner<'a, 'b, 'c>(&self, block: IRBlock<'a, 'b, 'c>) -> Scope<'a, 'b, 'c> {
self.clone().with_block(block)
}
@ -139,13 +155,13 @@ impl ScopeData {
}
}
struct Scope<'a, 'b> {
struct Scope<'a, 'b, 'c> {
data: ScopeData,
block: IRBlock<'a, 'b>,
block: IRBlock<'a, 'b, 'c>,
}
impl<'a, 'b> Scope<'a, 'b> {
fn inner(&self, block: IRBlock<'a, 'b>) -> Scope<'a, 'b> {
impl<'a, 'b, 'c> Scope<'a, 'b, 'c> {
fn inner(&self, block: IRBlock<'a, 'b, 'c>) -> Scope<'a, 'b, 'c> {
self.data.clone().with_block(block)
}
}