cargo/core/compiler/
artifact.rs

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1//! Generate artifact information from unit dependencies for configuring the compiler environment.
2
3use crate::core::compiler::unit_graph::UnitDep;
4use crate::core::compiler::{BuildRunner, CrateType, FileFlavor, Unit};
5use crate::core::dependency::ArtifactKind;
6use crate::core::{Dependency, Target, TargetKind};
7use crate::CargoResult;
8use std::collections::{HashMap, HashSet};
9use std::ffi::OsString;
10
11/// Return all environment variables for the given unit-dependencies
12/// if artifacts are present.
13pub fn get_env(
14    build_runner: &BuildRunner<'_, '_>,
15    dependencies: &[UnitDep],
16) -> CargoResult<HashMap<String, OsString>> {
17    let mut env = HashMap::new();
18    for unit_dep in dependencies.iter().filter(|d| d.unit.artifact.is_true()) {
19        for artifact_path in build_runner
20            .outputs(&unit_dep.unit)?
21            .iter()
22            .filter_map(|f| (f.flavor == FileFlavor::Normal).then(|| &f.path))
23        {
24            let artifact_type_upper = unit_artifact_type_name_upper(&unit_dep.unit);
25            let dep_name = unit_dep.dep_name.unwrap_or(unit_dep.unit.pkg.name());
26            let dep_name_upper = dep_name.to_uppercase().replace("-", "_");
27
28            let var = format!("CARGO_{}_DIR_{}", artifact_type_upper, dep_name_upper);
29            let path = artifact_path.parent().expect("parent dir for artifacts");
30            env.insert(var, path.to_owned().into());
31
32            let var_file = format!(
33                "CARGO_{}_FILE_{}_{}",
34                artifact_type_upper,
35                dep_name_upper,
36                unit_dep.unit.target.name()
37            );
38
39            // In older releases, lib-targets defaulted to the name of the package. Newer releases
40            // use the same name as default, but with dashes replaced. Hence, if the name of the
41            // target was inferred by Cargo, we also set the env-var with the unconverted name for
42            // backwards compatibility.
43            let need_compat = unit_dep.unit.target.is_lib() && unit_dep.unit.target.name_inferred();
44            if need_compat {
45                let var_compat = format!(
46                    "CARGO_{}_FILE_{}_{}",
47                    artifact_type_upper,
48                    dep_name_upper,
49                    unit_dep.unit.pkg.name(),
50                );
51                if var_compat != var_file {
52                    env.insert(var_compat, artifact_path.to_owned().into());
53                }
54            }
55
56            env.insert(var_file, artifact_path.to_owned().into());
57
58            // If the name of the target matches the name of the dependency, we strip the
59            // repetition and provide the simpler env-var as well.
60            // For backwards-compatibility of inferred names, we compare against the name of the
61            // package as well, since that used to be the default for library targets.
62            if unit_dep.unit.target.name() == dep_name.as_str()
63                || (need_compat && unit_dep.unit.pkg.name() == dep_name.as_str())
64            {
65                let var = format!("CARGO_{}_FILE_{}", artifact_type_upper, dep_name_upper,);
66                env.insert(var, artifact_path.to_owned().into());
67            }
68        }
69    }
70    Ok(env)
71}
72
73fn unit_artifact_type_name_upper(unit: &Unit) -> &'static str {
74    match unit.target.kind() {
75        TargetKind::Lib(kinds) => match kinds.as_slice() {
76            &[CrateType::Cdylib] => "CDYLIB",
77            &[CrateType::Staticlib] => "STATICLIB",
78            invalid => unreachable!("BUG: artifacts cannot be of type {:?}", invalid),
79        },
80        TargetKind::Bin => "BIN",
81        invalid => unreachable!("BUG: artifacts cannot be of type {:?}", invalid),
82    }
83}
84
85/// Given a dependency with an artifact `artifact_dep` and a set of available `targets`
86/// of its package, find a target for each kind of artifacts that are to be built.
87///
88/// Failure to match any target results in an error mentioning the parent manifests
89/// `parent_package` name.
90pub(crate) fn match_artifacts_kind_with_targets<'t, 'd>(
91    artifact_dep: &'d Dependency,
92    targets: &'t [Target],
93    parent_package: &str,
94) -> CargoResult<HashSet<(&'d ArtifactKind, &'t Target)>> {
95    let mut out = HashSet::new();
96    let artifact_requirements = artifact_dep.artifact().expect("artifact present");
97    for artifact_kind in artifact_requirements.kinds() {
98        let mut extend = |kind, filter: &dyn Fn(&&Target) -> bool| {
99            let mut iter = targets.iter().filter(filter).peekable();
100            let found = iter.peek().is_some();
101            out.extend(std::iter::repeat(kind).zip(iter));
102            found
103        };
104        let found = match artifact_kind {
105            ArtifactKind::Cdylib => extend(artifact_kind, &|t| t.is_cdylib()),
106            ArtifactKind::Staticlib => extend(artifact_kind, &|t| t.is_staticlib()),
107            ArtifactKind::AllBinaries => extend(artifact_kind, &|t| t.is_bin()),
108            ArtifactKind::SelectedBinary(bin_name) => extend(artifact_kind, &|t| {
109                t.is_bin() && t.name() == bin_name.as_str()
110            }),
111        };
112        if !found {
113            anyhow::bail!(
114                "dependency `{}` in package `{}` requires a `{}` artifact to be present.",
115                artifact_dep.name_in_toml(),
116                parent_package,
117                artifact_kind
118            );
119        }
120    }
121    Ok(out)
122}
cargo/core/compiler/artifact.rs

cargo/core/compiler/
artifact.rs
