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stage2: @returnAddress()

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This commit is contained in:
Robin Voetter
2021-12-18 06:11:46 +01:00
parent 2f7e98c129
commit ddd2ef822f
10 changed files with 46 additions and 1 deletions
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5
src/codegen/c.zig
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@@ -1125,6 +1125,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.arg => airArg(f),
.breakpoint => try airBreakpoint(f),
.ret_addr => try airRetAddr(f),
.unreach => try airUnreach(f),
.fence => try airFence(f, inst),
@@ -2191,6 +2192,10 @@ fn airBreakpoint(f: *Function) !CValue {
return CValue.none;
}
fn airRetAddr(f: *Function) !CValue {
return f.fail("TODO implement codegen for airRetAddr", .{});
}
fn airFence(f: *Function, inst: Air.Inst.Index) !CValue {
const atomic_order = f.air.instructions.items(.data)[inst].fence;
const writer = f.object.writer();

10
src/codegen/llvm.zig
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@@ -1747,6 +1747,7 @@ pub const FuncGen = struct {
.br => try self.airBr(inst),
.switch_br => try self.airSwitchBr(inst),
.breakpoint => try self.airBreakpoint(inst),
.ret_addr => try self.airRetAddr(inst),
.call => try self.airCall(inst),
.cond_br => try self.airCondBr(inst),
.intcast => try self.airIntCast(inst),
@@ -3550,6 +3551,15 @@ pub const FuncGen = struct {
return null;
}
fn airRetAddr(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
_ = inst;
const i32_zero = self.context.intType(32).constNull();
const usize_llvm_ty = try self.dg.llvmType(Type.usize);
const llvm_fn = self.getIntrinsic("llvm.returnaddress", &.{});
const ptr_val = self.builder.buildCall(llvm_fn, &[_]*const llvm.Value{i32_zero}, 1, .Fast, .Auto, "");
return self.builder.buildPtrToInt(ptr_val, usize_llvm_ty, "");
}
fn airFence(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
const atomic_order = self.air.instructions.items(.data)[inst].fence;
const llvm_memory_order = toLlvmAtomicOrdering(atomic_order);