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Implement asm goto for LLVM and GCC backend

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This commit is contained in:
Gary Guo 2023-12-27 04:08:04 +00:00
parent 27e6ee102e
commit 5e4fd6bc23
5 changed files with 84 additions and 22 deletions
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31
compiler/rustc_codegen_gcc/src/asm.rs
View File

@ -107,7 +107,7 @@ enum ConstraintOrRegister {
impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
fn codegen_inline_asm(&mut self, template: &[InlineAsmTemplatePiece], rust_operands: &[InlineAsmOperandRef<'tcx, Self>], options: InlineAsmOptions, span: &[Span], instance: Instance<'_>, _dest_catch_funclet: Option<(Self::BasicBlock, Self::BasicBlock, Option<&Self::Funclet>)>) {
fn codegen_inline_asm(&mut self, template: &[InlineAsmTemplatePiece], rust_operands: &[InlineAsmOperandRef<'tcx, Self>], options: InlineAsmOptions, span: &[Span], instance: Instance<'_>, dest: Option<Self::BasicBlock>, _catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>) {
if options.contains(InlineAsmOptions::MAY_UNWIND) {
self.sess().dcx()
.create_err(UnwindingInlineAsm { span: span[0] })
@ -126,6 +126,10 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
// added to `outputs.len()`
let mut inputs = vec![];
// GCC index of a label equals its position in the array added to
// `outputs.len() + inputs.len()`.
let mut labels = vec![];
// Clobbers collected from `out("explicit register") _` and `inout("expl_reg") var => _`
let mut clobbers = vec![];
@ -269,6 +273,10 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
// some targets to add a leading underscore (Mach-O).
constants_len += self.tcx.symbol_name(Instance::mono(self.tcx, def_id)).name.len();
}
InlineAsmOperandRef::Label { label } => {
labels.push(label);
}
}
}
@ -368,6 +376,10 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
InlineAsmOperandRef::Const { .. } => {
// processed in the previous pass
}
InlineAsmOperandRef::Label { .. } => {
// processed in the previous pass
}
}
}
@ -454,6 +466,14 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
InlineAsmOperandRef::Const { ref string } => {
template_str.push_str(string);
}
InlineAsmOperandRef::Label { label } => {
let label_gcc_index = labels.iter()
.position(|&l| l == label)
.expect("wrong rust index");
let gcc_index = label_gcc_index + outputs.len() + inputs.len();
push_to_template(Some('l'), gcc_index);
}
}
}
}
@ -466,7 +486,12 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
// 4. Generate Extended Asm block
let block = self.llbb();
let extended_asm = block.add_extended_asm(None, &template_str);
let extended_asm = if let Some(dest) = dest {
assert!(!labels.is_empty());
block.end_with_extended_asm_goto(None, &template_str, &labels, Some(dest))
} else {
block.add_extended_asm(None, &template_str)
};
for op in &outputs {
extended_asm.add_output_operand(None, &op.to_constraint(), op.tmp_var);
@ -494,7 +519,7 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
if !options.contains(InlineAsmOptions::NOSTACK) {
// TODO(@Commeownist): figure out how to align stack
}
if options.contains(InlineAsmOptions::NORETURN) {
if dest.is_none() && options.contains(InlineAsmOptions::NORETURN) {
let builtin_unreachable = self.context.get_builtin_function("__builtin_unreachable");
let builtin_unreachable: RValue<'gcc> = unsafe { std::mem::transmute(builtin_unreachable) };
self.call(self.type_void(), None, None, builtin_unreachable, &[], None);

29
compiler/rustc_codegen_llvm/src/asm.rs
View File

@ -28,7 +28,8 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
options: InlineAsmOptions,
line_spans: &[Span],
instance: Instance<'_>,
dest_catch_funclet: Option<(Self::BasicBlock, Self::BasicBlock, Option<&Self::Funclet>)>,
dest: Option<Self::BasicBlock>,
catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
) {
let asm_arch = self.tcx.sess.asm_arch.unwrap();
@ -165,6 +166,7 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
}
// Build the template string
let mut labels = vec![];
let mut template_str = String::new();
for piece in template {
match *piece {
@ -205,6 +207,11 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
// Only emit the raw symbol name
template_str.push_str(&format!("${{{}:c}}", op_idx[&operand_idx]));
}
InlineAsmOperandRef::Label { label } => {
template_str.push_str(&format!("${{{}:l}}", constraints.len()));
constraints.push("!i".to_owned());
labels.push(label);
}
}
}
}
@ -292,12 +299,14 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
&constraints.join(","),
&inputs,
output_type,
&labels,
volatile,
alignstack,
dialect,
line_spans,
options.contains(InlineAsmOptions::MAY_UNWIND),
dest_catch_funclet,
dest,
catch_funclet,
)
.unwrap_or_else(|| span_bug!(line_spans[0], "LLVM asm constraint validation failed"));
@ -317,7 +326,7 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
attributes::apply_to_callsite(result, llvm::AttributePlace::Function, &{ attrs });
// Switch to the 'normal' basic block if we did an `invoke` instead of a `call`
if let Some((dest, _, _)) = dest_catch_funclet {
if let Some(dest) = dest {
self.switch_to_block(dest);
}
@ -415,16 +424,14 @@ pub(crate) fn inline_asm_call<'ll>(
cons: &str,
inputs: &[&'ll Value],
output: &'ll llvm::Type,
labels: &[&'ll llvm::BasicBlock],
volatile: bool,
alignstack: bool,
dia: llvm::AsmDialect,
line_spans: &[Span],
unwind: bool,
dest_catch_funclet: Option<(
&'ll llvm::BasicBlock,
&'ll llvm::BasicBlock,
Option<&Funclet<'ll>>,
)>,
dest: Option<&'ll llvm::BasicBlock>,
catch_funclet: Option<(&'ll llvm::BasicBlock, Option<&Funclet<'ll>>)>,
) -> Option<&'ll Value> {
let volatile = if volatile { llvm::True } else { llvm::False };
let alignstack = if alignstack { llvm::True } else { llvm::False };
@ -457,8 +464,10 @@ pub(crate) fn inline_asm_call<'ll>(
can_throw,
);
let call = if let Some((dest, catch, funclet)) = dest_catch_funclet {
bx.invoke(fty, None, None, v, inputs, dest, catch, funclet)
let call = if !labels.is_empty() {
bx.callbr(fty, None, None, v, inputs, dest.unwrap(), labels, None)
} else if let Some((catch, funclet)) = catch_funclet {
bx.invoke(fty, None, None, v, inputs, dest.unwrap(), catch, funclet)
} else {
bx.call(fty, None, None, v, inputs, None)
};

2
compiler/rustc_codegen_llvm/src/intrinsic.rs
View File

@ -377,12 +377,14 @@ impl<'ll, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'_, 'll, 'tcx> {
constraint,
inputs,
self.type_void(),
&[],
true,
false,
llvm::AsmDialect::Att,
&[span],
false,
None,
None,
)
.unwrap_or_else(|| bug!("failed to generate inline asm call for `black_box`"));

38
compiler/rustc_codegen_ssa/src/mir/block.rs
View File

@ -264,7 +264,7 @@ impl<'a, 'tcx> TerminatorCodegenHelper<'tcx> {
mir::UnwindAction::Unreachable => None,
};
if let Some(cleanup) = unwind_target {
if operands.iter().any(|x| matches!(x, InlineAsmOperandRef::Label { .. })) {
let ret_llbb = if let Some(target) = destination {
fx.llbb(target)
} else {
@ -277,11 +277,29 @@ impl<'a, 'tcx> TerminatorCodegenHelper<'tcx> {
options,
line_spans,
instance,
Some((ret_llbb, cleanup, self.funclet(fx))),
Some(ret_llbb),
None,
);
MergingSucc::False
} else if let Some(cleanup) = unwind_target {
let ret_llbb = if let Some(target) = destination {
fx.llbb(target)
} else {
fx.unreachable_block()
};
bx.codegen_inline_asm(
template,
operands,
options,
line_spans,
instance,
Some(ret_llbb),
Some((cleanup, self.funclet(fx))),
);
MergingSucc::False
} else {
bx.codegen_inline_asm(template, operands, options, line_spans, instance, None);
bx.codegen_inline_asm(template, operands, options, line_spans, instance, None, None);
if let Some(target) = destination {
self.funclet_br(fx, bx, target, mergeable_succ)
@ -1067,7 +1085,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
operands: &[mir::InlineAsmOperand<'tcx>],
options: ast::InlineAsmOptions,
line_spans: &[Span],
destination: Option<mir::BasicBlock>,
targets: &[mir::BasicBlock],
unwind: mir::UnwindAction,
instance: Instance<'_>,
mergeable_succ: bool,
@ -1119,8 +1137,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::InlineAsmOperand::SymStatic { def_id } => {
InlineAsmOperandRef::SymStatic { def_id }
}
mir::InlineAsmOperand::Label { target_index: _ } => {
todo!();
mir::InlineAsmOperand::Label { target_index } => {
InlineAsmOperandRef::Label { label: self.llbb(targets[target_index]) }
}
})
.collect();
@ -1132,7 +1150,11 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
&operands,
options,
line_spans,
destination,
if options.contains(InlineAsmOptions::NORETURN) {
None
} else {
targets.get(0).copied()
},
unwind,
instance,
mergeable_succ,
@ -1298,7 +1320,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
operands,
options,
line_spans,
targets.get(0).copied(),
targets,
unwind,
self.instance,
mergeable_succ(),

6
compiler/rustc_codegen_ssa/src/traits/asm.rs
View File

@ -33,6 +33,9 @@ pub enum InlineAsmOperandRef<'tcx, B: BackendTypes + ?Sized> {
SymStatic {
def_id: DefId,
},
Label {
label: B::BasicBlock,
},
}
#[derive(Debug)]
@ -51,7 +54,8 @@ pub trait AsmBuilderMethods<'tcx>: BackendTypes {
options: InlineAsmOptions,
line_spans: &[Span],
instance: Instance<'_>,
dest_catch_funclet: Option<(Self::BasicBlock, Self::BasicBlock, Option<&Self::Funclet>)>,
dest: Option<Self::BasicBlock>,
catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
);
}