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rust: add build_error crate

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The `build_error` crate provides a function `build_error` which
will panic at compile-time if executed in const context and,
by default, will cause a build error if not executed at compile
time and the optimizer does not optimise away the call.

The `CONFIG_RUST_BUILD_ASSERT_ALLOW` kernel option allows to
relax the default build failure and convert it to a runtime
check. If the runtime check fails, `panic!` will be called.

Its functionality will be exposed to users as a couple macros in
the `kernel` crate in the following patch, thus some documentation
here refers to them for simplicity.

Signed-off-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Gary Guo
2022-11-10 17:41:37 +01:00
committed by Miguel Ojeda
parent ef9e37973c
commit ecaa6ddff2
5 changed files with 76 additions and 6 deletions
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22
rust/Makefile
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@@ -19,6 +19,12 @@ obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o
always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \
exports_kernel_generated.h
ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
obj-$(CONFIG_RUST) += build_error.o
else
always-$(CONFIG_RUST) += build_error.o
endif
obj-$(CONFIG_RUST) += exports.o
# Avoids running `$(RUSTC)` for the sysroot when it may not be available.
@@ -108,7 +114,7 @@ rustdoc-alloc: $(src)/alloc/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
$(call if_changed,rustdoc)
rustdoc-kernel: private rustc_target_flags = --extern alloc \
--extern macros=$(objtree)/$(obj)/libmacros.so \
--extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
--extern bindings
rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
@@ -126,6 +132,9 @@ quiet_cmd_rustc_test_library = RUSTC TL $<
-L$(objtree)/$(obj)/test \
--crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE
$(call if_changed,rustc_test_library)
rusttestlib-macros: private rustc_target_flags = --extern proc_macro
rusttestlib-macros: private rustc_test_library_proc = yes
rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
@@ -216,9 +225,9 @@ rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
$(call if_changed,rustdoc_test)
rusttest-kernel: private rustc_target_flags = --extern alloc \
--extern macros --extern bindings
--extern build_error --extern macros --extern bindings
rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
rusttestlib-macros rusttestlib-bindings FORCE
rusttestlib-build_error rusttestlib-macros rusttestlib-bindings FORCE
$(call if_changed,rustc_test)
$(call if_changed,rustc_test_library)
@@ -366,6 +375,9 @@ $(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
$(obj)/alloc.o: $(src)/alloc/lib.rs $(obj)/compiler_builtins.o FORCE
$(call if_changed_dep,rustc_library)
$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
$(call if_changed_dep,rustc_library)
$(obj)/bindings.o: $(src)/bindings/lib.rs \
$(obj)/compiler_builtins.o \
$(obj)/bindings/bindings_generated.rs \
@@ -373,8 +385,8 @@ $(obj)/bindings.o: $(src)/bindings/lib.rs \
$(call if_changed_dep,rustc_library)
$(obj)/kernel.o: private rustc_target_flags = --extern alloc \
--extern macros --extern bindings
$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o \
--extern build_error --extern macros --extern bindings
$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
$(obj)/libmacros.so $(obj)/bindings.o FORCE
$(call if_changed_dep,rustc_library)