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//! A `BasicBlock` is a container of instructions.
use llvm_sys::core::{
LLVMBasicBlockAsValue, LLVMBlockAddress, LLVMDeleteBasicBlock, LLVMGetBasicBlockName, LLVMGetBasicBlockParent,
LLVMGetBasicBlockTerminator, LLVMGetFirstInstruction, LLVMGetFirstUse, LLVMGetLastInstruction,
LLVMGetNextBasicBlock, LLVMGetPreviousBasicBlock, LLVMGetTypeContext, LLVMIsABasicBlock, LLVMIsConstant,
LLVMMoveBasicBlockAfter, LLVMMoveBasicBlockBefore, LLVMPrintTypeToString, LLVMPrintValueToString,
LLVMRemoveBasicBlockFromParent, LLVMReplaceAllUsesWith, LLVMTypeOf,
};
use llvm_sys::prelude::{LLVMBasicBlockRef, LLVMValueRef};
use crate::context::ContextRef;
use crate::support::to_c_str;
use crate::values::{AsValueRef, BasicValueUse, FunctionValue, InstructionValue, PointerValue};
use std::ffi::CStr;
use std::fmt;
use std::marker::PhantomData;
/// A `BasicBlock` is a container of instructions.
///
/// `BasicBlock`s are values because they can be referenced by instructions (ie branching and switches).
///
/// A well formed `BasicBlock` is a list of non terminating instructions followed by a single terminating
/// instruction. `BasicBlock`s are allowed to be malformed prior to running validation because it may be useful
/// when constructing or modifying a program.
#[derive(PartialEq, Eq, Clone, Copy, Hash)]
pub struct BasicBlock<'ctx> {
pub(crate) basic_block: LLVMBasicBlockRef,
_marker: PhantomData<&'ctx ()>,
}
impl<'ctx> BasicBlock<'ctx> {
pub(crate) unsafe fn new(basic_block: LLVMBasicBlockRef) -> Option<Self> {
if basic_block.is_null() {
return None;
}
// NOTE: There is a LLVMBasicBlockAsValue but it might be the same as casting
assert!(!LLVMIsABasicBlock(basic_block as LLVMValueRef).is_null());
Some(BasicBlock {
basic_block,
_marker: PhantomData,
})
}
/// Acquires the underlying raw pointer belonging to this `BasicBlock` type.
pub fn as_mut_ptr(&self) -> LLVMBasicBlockRef {
self.basic_block
}
/// Obtains the `FunctionValue` that this `BasicBlock` belongs to, if any.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block = context.append_basic_block(function, "entry");
///
/// assert_eq!(basic_block.get_parent().unwrap(), function);
///
/// basic_block.remove_from_function();
///
/// assert!(basic_block.get_parent().is_none());
/// ```
pub fn get_parent(self) -> Option<FunctionValue<'ctx>> {
unsafe { FunctionValue::new(LLVMGetBasicBlockParent(self.basic_block)) }
}
/// Gets the `BasicBlock` preceding the current one, in its own scope, if any.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function1 = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block1 = context.append_basic_block(function1, "entry");
///
/// assert!(basic_block1.get_previous_basic_block().is_none());
///
/// let function2 = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block2 = context.append_basic_block(function2, "entry");
/// let basic_block3 = context.append_basic_block(function2, "next");
///
/// assert!(basic_block2.get_previous_basic_block().is_none());
/// assert_eq!(basic_block3.get_previous_basic_block().unwrap(), basic_block2);
/// ```
pub fn get_previous_basic_block(self) -> Option<BasicBlock<'ctx>> {
self.get_parent()?;
unsafe { BasicBlock::new(LLVMGetPreviousBasicBlock(self.basic_block)) }
}
/// Gets the `BasicBlock` succeeding the current one, in its own scope, if any.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function1 = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block1 = context.append_basic_block(function1, "entry");
///
/// assert!(basic_block1.get_next_basic_block().is_none());
///
/// let function2 = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block2 = context.append_basic_block(function2, "entry");
/// let basic_block3 = context.append_basic_block(function2, "next");
///
/// assert!(basic_block1.get_next_basic_block().is_none());
/// assert_eq!(basic_block2.get_next_basic_block().unwrap(), basic_block3);
/// assert!(basic_block3.get_next_basic_block().is_none());
/// ```
pub fn get_next_basic_block(self) -> Option<BasicBlock<'ctx>> {
self.get_parent()?;
unsafe { BasicBlock::new(LLVMGetNextBasicBlock(self.basic_block)) }
}
/// Prepends one `BasicBlock` before another.
/// It returns `Err(())` when either `BasicBlock` has no parent, as LLVM assumes they both have parents.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block1 = context.append_basic_block(function, "entry");
/// let basic_block2 = context.append_basic_block(function, "next");
///
/// basic_block2.move_before(basic_block1);
///
/// assert!(basic_block1.get_next_basic_block().is_none());
/// assert_eq!(basic_block2.get_next_basic_block().unwrap(), basic_block1);
/// ```
// REVIEW: What happens if blocks are from different scopes?
pub fn move_before(self, basic_block: BasicBlock<'ctx>) -> Result<(), ()> {
// This method is UB if the parent no longer exists, so we must check for parent (or encode into type system)
if self.get_parent().is_none() || basic_block.get_parent().is_none() {
return Err(());
}
unsafe { LLVMMoveBasicBlockBefore(self.basic_block, basic_block.basic_block) }
Ok(())
}
/// Appends one `BasicBlock` after another.
/// It returns `Err(())` when either `BasicBlock` has no parent, as LLVM assumes they both have parents.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
///
/// let basic_block1 = context.append_basic_block(function, "entry");
/// let basic_block2 = context.append_basic_block(function, "next");
///
/// basic_block1.move_after(basic_block2);
///
/// assert!(basic_block1.get_next_basic_block().is_none());
/// assert_eq!(basic_block2.get_next_basic_block().unwrap(), basic_block1);
/// ```
// REVIEW: What happens if blocks are from different scopes?
pub fn move_after(self, basic_block: BasicBlock<'ctx>) -> Result<(), ()> {
// This method is UB if the parent no longer exists, so we must check for parent (or encode into type system)
if self.get_parent().is_none() || basic_block.get_parent().is_none() {
return Err(());
}
unsafe { LLVMMoveBasicBlockAfter(self.basic_block, basic_block.basic_block) }
Ok(())
}
/// Obtains the first `InstructionValue` in this `BasicBlock`, if any.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
/// use inkwell::values::InstructionOpcode;
///
/// let context = Context::create();
/// let builder = context.create_builder();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
/// let basic_block = context.append_basic_block(function, "entry");
///
/// builder.position_at_end(basic_block);
/// builder.build_return(None);
///
/// assert_eq!(basic_block.get_first_instruction().unwrap().get_opcode(), InstructionOpcode::Return);
/// ```
pub fn get_first_instruction(self) -> Option<InstructionValue<'ctx>> {
let value = unsafe { LLVMGetFirstInstruction(self.basic_block) };
if value.is_null() {
return None;
}
unsafe { Some(InstructionValue::new(value)) }
}
/// Obtains the last `InstructionValue` in this `BasicBlock`, if any. A `BasicBlock` must have a last instruction to be valid.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
/// use inkwell::values::InstructionOpcode;
///
/// let context = Context::create();
/// let builder = context.create_builder();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
/// let basic_block = context.append_basic_block(function, "entry");
///
/// builder.position_at_end(basic_block);
/// builder.build_return(None);
///
/// assert_eq!(basic_block.get_last_instruction().unwrap().get_opcode(), InstructionOpcode::Return);
/// ```
pub fn get_last_instruction(self) -> Option<InstructionValue<'ctx>> {
let value = unsafe { LLVMGetLastInstruction(self.basic_block) };
if value.is_null() {
return None;
}
unsafe { Some(InstructionValue::new(value)) }
}
/// Performs a linear lookup to obtain a instruction based on the name
///
/// # Example
/// ```rust
/// use inkwell::context::Context;
/// use inkwell::AddressSpace;
///
/// let context = Context::create();
/// let module = context.create_module("ret");
/// let builder = context.create_builder();
///
/// let void_type = context.void_type();
/// let i32_type = context.i32_type();
/// let i32_ptr_type = i32_type.ptr_type(AddressSpace::default());
///
/// let fn_type = void_type.fn_type(&[i32_ptr_type.into()], false);
/// let fn_value = module.add_function("ret", fn_type, None);
/// let entry = context.append_basic_block(fn_value, "entry");
/// builder.position_at_end(entry);
///
/// let var = builder.build_alloca(i32_type, "some_number").unwrap();
/// builder.build_store(var, i32_type.const_int(1 as u64, false)).unwrap();
/// builder.build_return(None).unwrap();
///
/// let block = fn_value.get_first_basic_block().unwrap();
/// let some_number = block.get_instruction_with_name("some_number");
///
/// assert!(some_number.is_some());
/// assert_eq!(some_number.unwrap().get_name().unwrap().to_str(), Ok("some_number"))
/// ```
pub fn get_instruction_with_name(self, name: &str) -> Option<InstructionValue<'ctx>> {
let instruction = self.get_first_instruction()?;
instruction.get_instruction_with_name(name)
}
/// Obtains the terminating `InstructionValue` in this `BasicBlock`, if any. A `BasicBlock` must have a terminating instruction to be valid.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
/// use inkwell::values::InstructionOpcode;
///
/// let context = Context::create();
/// let builder = context.create_builder();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
/// let basic_block = context.append_basic_block(function, "entry");
///
/// builder.position_at_end(basic_block);
/// builder.build_return(None);
///
/// assert_eq!(basic_block.get_terminator().unwrap().get_opcode(), InstructionOpcode::Return);
/// ```
// REVIEW: If we wanted the return type could be Option<Either<BasicValueEnum, InstructionValue>>
// if getting a value over an instruction is preferable
// TODOC: Every BB must have a terminating instruction or else it is invalid
// REVIEW: Unclear how this differs from get_last_instruction
pub fn get_terminator(self) -> Option<InstructionValue<'ctx>> {
let value = unsafe { LLVMGetBasicBlockTerminator(self.basic_block) };
if value.is_null() {
return None;
}
unsafe { Some(InstructionValue::new(value)) }
}
/// Get an instruction iterator
pub fn get_instructions(self) -> InstructionIter<'ctx> {
InstructionIter(self.get_first_instruction())
}
/// Removes this `BasicBlock` from its parent `FunctionValue`.
/// It returns `Err(())` when it has no parent to remove from.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
/// let basic_block = context.append_basic_block(function, "entry");
///
/// assert_eq!(basic_block.get_parent().unwrap(), function);
///
/// basic_block.remove_from_function();
///
/// assert!(basic_block.get_parent().is_none());
/// ```
// SubTypes: Don't need to call get_parent for a BasicBlock<HasParent> and would return BasicBlock<Orphan>
// by taking ownership of self (though BasicBlock's are not uniquely obtained...)
// might have to make some methods do something like -> Result<..., BasicBlock<Orphan>> for BasicBlock<HasParent>
// and would move_before/after make it no longer orphaned? etc..
pub fn remove_from_function(self) -> Result<(), ()> {
// This method is UB if the parent no longer exists, so we must check for parent (or encode into type system)
if self.get_parent().is_none() {
return Err(());
}
unsafe { LLVMRemoveBasicBlockFromParent(self.basic_block) }
Ok(())
}
/// Removes this `BasicBlock` completely from memory. This is unsafe because you could easily have other references to the same `BasicBlock`.
/// It returns `Err(())` when it has no parent to delete from, as LLVM assumes it has a parent.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
/// let basic_block = context.append_basic_block(function, "entry");
///
/// unsafe {
/// basic_block.delete();
/// }
/// assert!(function.get_basic_blocks().is_empty());
/// ```
pub unsafe fn delete(self) -> Result<(), ()> {
// This method is UB if the parent no longer exists, so we must check for parent (or encode into type system)
if self.get_parent().is_none() {
return Err(());
}
LLVMDeleteBasicBlock(self.basic_block);
Ok(())
}
/// Obtains the `ContextRef` this `BasicBlock` belongs to.
///
/// # Example
/// ```no_run
/// use inkwell::context::Context;
/// use inkwell::module::Module;
/// use inkwell::builder::Builder;
///
/// let context = Context::create();
/// let module = context.create_module("my_module");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let function = module.add_function("do_nothing", fn_type, None);
/// let basic_block = context.append_basic_block(function, "entry");
///
/// assert_eq!(context, basic_block.get_context());
/// ```
pub fn get_context(self) -> ContextRef<'ctx> {
unsafe { ContextRef::new(LLVMGetTypeContext(LLVMTypeOf(LLVMBasicBlockAsValue(self.basic_block)))) }
}
/// Gets the name of a `BasicBlock`.
///
/// # Example
///
/// ```no_run
/// use inkwell::context::Context;
///
/// let context = Context::create();
/// let builder = context.create_builder();
/// let module = context.create_module("my_mod");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let fn_val = module.add_function("my_fn", fn_type, None);
/// let bb = context.append_basic_block(fn_val, "entry");
///
/// assert_eq!(bb.get_name().to_str(), Ok("entry"));
/// ```
pub fn get_name(&self) -> &CStr {
let ptr = unsafe { LLVMGetBasicBlockName(self.basic_block) };
unsafe { CStr::from_ptr(ptr) }
}
/// Set name of the `BasicBlock`.
pub fn set_name(&self, name: &str) {
let c_string = to_c_str(name);
#[cfg(any(feature = "llvm4-0", feature = "llvm5-0", feature = "llvm6-0"))]
{
use llvm_sys::core::LLVMSetValueName;
unsafe { LLVMSetValueName(LLVMBasicBlockAsValue(self.basic_block), c_string.as_ptr()) };
}
#[cfg(not(any(feature = "llvm4-0", feature = "llvm5-0", feature = "llvm6-0")))]
{
use llvm_sys::core::LLVMSetValueName2;
unsafe { LLVMSetValueName2(LLVMBasicBlockAsValue(self.basic_block), c_string.as_ptr(), name.len()) };
}
}
/// Replaces all uses of this basic block with another.
///
/// # Example
///
/// ```
/// use inkwell::context::Context;
///
/// let context = Context::create();
/// let builder = context.create_builder();
/// let module = context.create_module("my_mod");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let fn_val = module.add_function("my_fn", fn_type, None);
/// let entry = context.append_basic_block(fn_val, "entry");
/// let bb1 = context.append_basic_block(fn_val, "bb1");
/// let bb2 = context.append_basic_block(fn_val, "bb2");
/// builder.position_at_end(entry);
/// let branch_inst = builder.build_unconditional_branch(bb1).unwrap();
///
/// bb1.replace_all_uses_with(&bb2);
///
/// assert_eq!(branch_inst.get_operand(0).unwrap().right().unwrap(), bb2);
/// ```
pub fn replace_all_uses_with(self, other: &BasicBlock<'ctx>) {
let value = unsafe { LLVMBasicBlockAsValue(self.basic_block) };
let other = unsafe { LLVMBasicBlockAsValue(other.basic_block) };
// LLVM may infinite-loop when they aren't distinct, which is UB in C++.
if value != other {
unsafe {
LLVMReplaceAllUsesWith(value, other);
}
}
}
/// Gets the first use of this `BasicBlock` if any.
///
/// The following example,
///
/// ```no_run
/// use inkwell::AddressSpace;
/// use inkwell::context::Context;
/// use inkwell::values::BasicValue;
///
/// let context = Context::create();
/// let module = context.create_module("ivs");
/// let builder = context.create_builder();
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let fn_val = module.add_function("my_fn", fn_type, None);
/// let entry = context.append_basic_block(fn_val, "entry");
/// let bb1 = context.append_basic_block(fn_val, "bb1");
/// let bb2 = context.append_basic_block(fn_val, "bb2");
/// builder.position_at_end(entry);
/// let branch_inst = builder.build_unconditional_branch(bb1);
///
/// assert!(bb2.get_first_use().is_none());
/// assert!(bb1.get_first_use().is_some());
/// ```
pub fn get_first_use(self) -> Option<BasicValueUse<'ctx>> {
let use_ = unsafe { LLVMGetFirstUse(LLVMBasicBlockAsValue(self.basic_block)) };
if use_.is_null() {
return None;
}
unsafe { Some(BasicValueUse::new(use_)) }
}
/// Gets the address of this `BasicBlock` if possible. Returns `None` if `self` is the entry block to a function.
///
/// # Safety
///
/// The returned PointerValue may only be used for `call` and `indirect_branch` instructions
///
/// # Example
///
/// ```no_run
/// use inkwell::context::Context;
/// let context = Context::create();
/// let module = context.create_module("my_mod");
/// let void_type = context.void_type();
/// let fn_type = void_type.fn_type(&[], false);
/// let fn_val = module.add_function("my_fn", fn_type, None);
/// let entry_bb = context.append_basic_block(fn_val, "entry");
/// let next_bb = context.append_basic_block(fn_val, "next");
///
/// assert!(unsafe { entry_bb.get_address() }.is_none());
/// assert!(unsafe { next_bb.get_address() }.is_some());
/// ```
pub unsafe fn get_address(self) -> Option<PointerValue<'ctx>> {
let parent = self.get_parent()?;
// Taking the address of the entry block is illegal.
self.get_previous_basic_block()?;
let value = PointerValue::new(LLVMBlockAddress(parent.as_value_ref(), self.basic_block));
if value.is_null() {
return None;
}
Some(value)
}
}
impl fmt::Debug for BasicBlock<'_> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let llvm_value = unsafe { CStr::from_ptr(LLVMPrintValueToString(self.basic_block as LLVMValueRef)) };
let llvm_type = unsafe { CStr::from_ptr(LLVMPrintTypeToString(LLVMTypeOf(self.basic_block as LLVMValueRef))) };
let is_const = unsafe { LLVMIsConstant(self.basic_block as LLVMValueRef) == 1 };
f.debug_struct("BasicBlock")
.field("address", &self.basic_block)
.field("is_const", &is_const)
.field("llvm_value", &llvm_value)
.field("llvm_type", &llvm_type)
.finish()
}
}
/// Iterate over all `InstructionValue`s in a basic block.
#[derive(Debug)]
pub struct InstructionIter<'ctx>(Option<InstructionValue<'ctx>>);
impl<'ctx> Iterator for InstructionIter<'ctx> {
type Item = InstructionValue<'ctx>;
fn next(&mut self) -> Option<Self::Item> {
if let Some(instr) = self.0 {
self.0 = instr.get_next_instruction();
Some(instr)
} else {
None
}
}
}