Add 'compiler/rustc_codegen_gcc/' from commit 'afae271d5d3719eeb92c18bc004bb6d1965a5f3f'

git-subtree-dir: compiler/rustc_codegen_gcc
git-subtree-mainline: ae90dcf020
git-subtree-split: afae271d5d

compiler/rustc_codegen_gcc/src/coverageinfo.rs

@@ -0,0 +1,140 @@
+use gccjit::RValue;
+use rustc_codegen_ssa::traits::{CoverageInfoBuilderMethods, CoverageInfoMethods};
+use rustc_hir::def_id::DefId;
+use rustc_middle::mir::coverage::{
+    CodeRegion,
+    CounterValueReference,
+    ExpressionOperandId,
+    InjectedExpressionId,
+    Op,
+};
+use rustc_middle::ty::Instance;
+
+use crate::builder::Builder;
+use crate::context::CodegenCx;
+
+impl<'a, 'gcc, 'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
+    fn set_function_source_hash(
+        &mut self,
+        _instance: Instance<'tcx>,
+        _function_source_hash: u64,
+    ) -> bool {
+        unimplemented!();
+        /*if let Some(coverage_context) = self.coverage_context() {
+            debug!(
+                "ensuring function source hash is set for instance={:?}; function_source_hash={}",
+                instance, function_source_hash,
+            );
+            let mut coverage_map = coverage_context.function_coverage_map.borrow_mut();
+            coverage_map
+                .entry(instance)
+                .or_insert_with(|| FunctionCoverage::new(self.tcx, instance))
+                .set_function_source_hash(function_source_hash);
+            true
+        } else {
+            false
+        }*/
+    }
+
+    fn add_coverage_counter(&mut self, _instance: Instance<'tcx>, _id: CounterValueReference, _region: CodeRegion) -> bool {
+        /*if let Some(coverage_context) = self.coverage_context() {
+            debug!(
+                "adding counter to coverage_regions: instance={:?}, function_source_hash={}, id={:?}, \
+                at {:?}",
+                instance, function_source_hash, id, region,
+            );
+            let mut coverage_regions = coverage_context.function_coverage_map.borrow_mut();
+            coverage_regions
+                .entry(instance)
+                .or_insert_with(|| FunctionCoverage::new(self.tcx, instance))
+                .add_counter(function_source_hash, id, region);
+            true
+        } else {
+            false
+        }*/
+        // TODO
+        false
+    }
+
+    fn add_coverage_counter_expression(&mut self, _instance: Instance<'tcx>, _id: InjectedExpressionId, _lhs: ExpressionOperandId, _op: Op, _rhs: ExpressionOperandId, _region: Option<CodeRegion>) -> bool {
+        /*if let Some(coverage_context) = self.coverage_context() {
+            debug!(
+                "adding counter expression to coverage_regions: instance={:?}, id={:?}, {:?} {:?} {:?}, \
+                at {:?}",
+                instance, id, lhs, op, rhs, region,
+            );
+            let mut coverage_regions = coverage_context.function_coverage_map.borrow_mut();
+            coverage_regions
+                .entry(instance)
+                .or_insert_with(|| FunctionCoverage::new(self.tcx, instance))
+                .add_counter_expression(id, lhs, op, rhs, region);
+            true
+        } else {
+            false
+        }*/
+        // TODO
+        false
+    }
+
+    fn add_coverage_unreachable(&mut self, _instance: Instance<'tcx>, _region: CodeRegion) -> bool {
+        /*if let Some(coverage_context) = self.coverage_context() {
+            debug!(
+                "adding unreachable code to coverage_regions: instance={:?}, at {:?}",
+                instance, region,
+            );
+            let mut coverage_regions = coverage_context.function_coverage_map.borrow_mut();
+            coverage_regions
+                .entry(instance)
+                .or_insert_with(|| FunctionCoverage::new(self.tcx, instance))
+                .add_unreachable_region(region);
+            true
+        } else {
+            false
+        }*/
+        // TODO
+        false
+    }
+}
+
+impl<'gcc, 'tcx> CoverageInfoMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
+    fn coverageinfo_finalize(&self) {
+        // TODO
+        //mapgen::finalize(self)
+    }
+
+    fn get_pgo_func_name_var(&self, _instance: Instance<'tcx>) -> RValue<'gcc> {
+        unimplemented!();
+        /*if let Some(coverage_context) = self.coverage_context() {
+            debug!("getting pgo_func_name_var for instance={:?}", instance);
+            let mut pgo_func_name_var_map = coverage_context.pgo_func_name_var_map.borrow_mut();
+            pgo_func_name_var_map
+                .entry(instance)
+                .or_insert_with(|| create_pgo_func_name_var(self, instance))
+        } else {
+            bug!("Could not get the `coverage_context`");
+        }*/
+    }
+
+    /// Functions with MIR-based coverage are normally codegenned _only_ if
+    /// called. LLVM coverage tools typically expect every function to be
+    /// defined (even if unused), with at least one call to LLVM intrinsic
+    /// `instrprof.increment`.
+    ///
+    /// Codegen a small function that will never be called, with one counter
+    /// that will never be incremented.
+    ///
+    /// For used/called functions, the coverageinfo was already added to the
+    /// `function_coverage_map` (keyed by function `Instance`) during codegen.
+    /// But in this case, since the unused function was _not_ previously
+    /// codegenned, collect the coverage `CodeRegion`s from the MIR and add
+    /// them. The first `CodeRegion` is used to add a single counter, with the
+    /// same counter ID used in the injected `instrprof.increment` intrinsic
+    /// call. Since the function is never called, all other `CodeRegion`s can be
+    /// added as `unreachable_region`s.
+    fn define_unused_fn(&self, _def_id: DefId) {
+        unimplemented!();
+        /*let instance = declare_unused_fn(self, &def_id);
+        codegen_unused_fn_and_counter(self, instance);
+        add_unused_function_coverage(self, instance, def_id);*/
+    }
+}