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|
use crate::llvm;
use crate::builder::Builder;
use crate::common::CodegenCx;
use libc::c_uint;
use llvm::coverageinfo::CounterMappingRegion;
use log::debug;
use rustc_codegen_ssa::coverageinfo::map::{CounterExpression, ExprKind, FunctionCoverage};
use rustc_codegen_ssa::traits::{
BaseTypeMethods, CoverageInfoBuilderMethods, CoverageInfoMethods, StaticMethods,
};
use rustc_data_structures::fx::FxHashMap;
use rustc_llvm::RustString;
use rustc_middle::ty::Instance;
use std::cell::RefCell;
use std::ffi::CString;
pub mod mapgen;
const COVMAP_VAR_ALIGN_BYTES: usize = 8;
/// A context object for maintaining all state needed by the coverageinfo module.
pub struct CrateCoverageContext<'tcx> {
// Coverage region data for each instrumented function identified by DefId.
pub(crate) function_coverage_map: RefCell<FxHashMap<Instance<'tcx>, FunctionCoverage<'tcx>>>,
}
impl<'tcx> CrateCoverageContext<'tcx> {
pub fn new() -> Self {
Self { function_coverage_map: Default::default() }
}
pub fn take_function_coverage_map(&self) -> FxHashMap<Instance<'tcx>, FunctionCoverage<'tcx>> {
self.function_coverage_map.replace(FxHashMap::default())
}
}
impl CoverageInfoMethods for CodegenCx<'ll, 'tcx> {
fn coverageinfo_finalize(&self) {
mapgen::finalize(self)
}
}
impl CoverageInfoBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
fn add_counter_region(
&mut self,
instance: Instance<'tcx>,
function_source_hash: u64,
id: u32,
start_byte_pos: u32,
end_byte_pos: u32,
) {
debug!(
"adding counter to coverage_regions: instance={:?}, function_source_hash={}, id={}, \
byte range {}..{}",
instance, function_source_hash, id, start_byte_pos, end_byte_pos,
);
let mut coverage_regions = self.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, start_byte_pos, end_byte_pos);
}
fn add_counter_expression_region(
&mut self,
instance: Instance<'tcx>,
id_descending_from_max: u32,
lhs: u32,
op: ExprKind,
rhs: u32,
start_byte_pos: u32,
end_byte_pos: u32,
) {
debug!(
"adding counter expression to coverage_regions: instance={:?}, id={}, {} {:?} {}, \
byte range {}..{}",
instance, id_descending_from_max, lhs, op, rhs, start_byte_pos, end_byte_pos,
);
let mut coverage_regions = self.coverage_context().function_coverage_map.borrow_mut();
coverage_regions
.entry(instance)
.or_insert_with(|| FunctionCoverage::new(self.tcx, instance))
.add_counter_expression(
id_descending_from_max,
lhs,
op,
rhs,
start_byte_pos,
end_byte_pos,
);
}
fn add_unreachable_region(
&mut self,
instance: Instance<'tcx>,
start_byte_pos: u32,
end_byte_pos: u32,
) {
debug!(
"adding unreachable code to coverage_regions: instance={:?}, byte range {}..{}",
instance, start_byte_pos, end_byte_pos,
);
let mut coverage_regions = self.coverage_context().function_coverage_map.borrow_mut();
coverage_regions
.entry(instance)
.or_insert_with(|| FunctionCoverage::new(self.tcx, instance))
.add_unreachable_region(start_byte_pos, end_byte_pos);
}
}
pub(crate) fn write_filenames_section_to_buffer(filenames: &Vec<CString>, buffer: &RustString) {
let c_str_vec = filenames.iter().map(|cstring| cstring.as_ptr()).collect::<Vec<_>>();
unsafe {
llvm::LLVMRustCoverageWriteFilenamesSectionToBuffer(
c_str_vec.as_ptr(),
c_str_vec.len(),
buffer,
);
}
}
pub(crate) fn write_mapping_to_buffer(
virtual_file_mapping: Vec<u32>,
expressions: Vec<CounterExpression>,
mut mapping_regions: Vec<CounterMappingRegion>,
buffer: &RustString,
) {
unsafe {
llvm::LLVMRustCoverageWriteMappingToBuffer(
virtual_file_mapping.as_ptr(),
virtual_file_mapping.len() as c_uint,
expressions.as_ptr(),
expressions.len() as c_uint,
mapping_regions.as_mut_ptr(),
mapping_regions.len() as c_uint,
buffer,
);
}
}
pub(crate) fn compute_hash(name: &str) -> u64 {
let name = CString::new(name).expect("null error converting hashable name to C string");
unsafe { llvm::LLVMRustCoverageComputeHash(name.as_ptr()) }
}
pub(crate) fn mapping_version() -> u32 {
unsafe { llvm::LLVMRustCoverageMappingVersion() }
}
pub(crate) fn save_map_to_mod<'ll, 'tcx>(
cx: &CodegenCx<'ll, 'tcx>,
cov_data_val: &'ll llvm::Value,
) {
let covmap_var_name = llvm::build_string(|s| unsafe {
llvm::LLVMRustCoverageWriteMappingVarNameToString(s);
})
.expect("Rust Coverage Mapping var name failed UTF-8 conversion");
debug!("covmap var name: {:?}", covmap_var_name);
let covmap_section_name = llvm::build_string(|s| unsafe {
llvm::LLVMRustCoverageWriteSectionNameToString(cx.llmod, s);
})
.expect("Rust Coverage section name failed UTF-8 conversion");
debug!("covmap section name: {:?}", covmap_section_name);
let llglobal = llvm::add_global(cx.llmod, cx.val_ty(cov_data_val), &covmap_var_name);
llvm::set_initializer(llglobal, cov_data_val);
llvm::set_global_constant(llglobal, true);
llvm::set_linkage(llglobal, llvm::Linkage::InternalLinkage);
llvm::set_section(llglobal, &covmap_section_name);
llvm::set_alignment(llglobal, COVMAP_VAR_ALIGN_BYTES);
cx.add_used_global(llglobal);
}
|
