Implement bp2build converter for rust_proc_macro

Test: WIP
Bug: 297356482
Change-Id: I17d1a0a95d4a67ccbc9b2d74e49bcacd6ff4d26b

1 files changed, 66 insertions, 0 deletions

diff --git a/rust/proc_macro.go b/rust/proc_macro.go
index 832b62c36..26227d048 100644
--- a/rust/proc_macro.go
+++ b/rust/proc_macro.go
@@ -16,6 +16,8 @@ package rust
 
 import (
 	"android/soong/android"
+	"android/soong/bazel"
+	"fmt"
 )
 
 func init() {
@@ -47,6 +49,8 @@ func ProcMacroFactory() android.Module {
 func NewProcMacro(hod android.HostOrDeviceSupported) (*Module, *procMacroDecorator) {
 	module := newModule(hod, android.MultilibFirst)
 
+	android.InitBazelModule(module)
+
 	procMacro := &procMacroDecorator{
 		baseCompiler: NewBaseCompiler("lib", "lib64", InstallInSystem),
 		flagExporter: NewFlagExporter(),
@@ -99,3 +103,65 @@ func (procMacro *procMacroDecorator) everInstallable() bool {
 	// Proc_macros are never installed
 	return false
 }
+
+type procMacroAttributes struct {
+	Srcs           bazel.LabelListAttribute
+	Compile_data   bazel.LabelListAttribute
+	Crate_name     bazel.StringAttribute
+	Edition        bazel.StringAttribute
+	Crate_features bazel.StringListAttribute
+	Deps           bazel.LabelListAttribute
+	Rustc_flags    bazel.StringListAttribute
+}
+
+func procMacroBp2build(ctx android.TopDownMutatorContext, m *Module) {
+	procMacro := m.compiler.(*procMacroDecorator)
+	srcs, compileData := srcsAndCompileDataAttrs(ctx, *procMacro.baseCompiler)
+	deps := android.BazelLabelForModuleDeps(ctx, append(
+		procMacro.baseCompiler.Properties.Rustlibs,
+		procMacro.baseCompiler.Properties.Rlibs...,
+	))
+
+	var rustcFLags []string
+	for _, cfg := range procMacro.baseCompiler.Properties.Cfgs {
+		rustcFLags = append(rustcFLags, fmt.Sprintf("--cfg=%s", cfg))
+	}
+
+	attrs := &procMacroAttributes{
+		Srcs: bazel.MakeLabelListAttribute(
+			srcs,
+		),
+		Compile_data: bazel.MakeLabelListAttribute(
+			compileData,
+		),
+		Crate_name: bazel.StringAttribute{
+			Value: &procMacro.baseCompiler.Properties.Crate_name,
+		},
+		Edition: bazel.StringAttribute{
+			Value: procMacro.baseCompiler.Properties.Edition,
+		},
+		Crate_features: bazel.StringListAttribute{
+			Value: procMacro.baseCompiler.Properties.Features,
+		},
+		Deps: bazel.MakeLabelListAttribute(
+			deps,
+		),
+		Rustc_flags: bazel.StringListAttribute{
+			Value: append(
+				rustcFLags,
+				procMacro.baseCompiler.Properties.Flags...,
+			),
+		},
+	}
+	// m.IsConvertedByBp2build()
+	ctx.CreateBazelTargetModule(
+		bazel.BazelTargetModuleProperties{
+			Rule_class:        "rust_proc_macro",
+			Bzl_load_location: "@rules_rust//rust:defs.bzl",
+		},
+		android.CommonAttributes{
+			Name: m.Name(),
+		},
+		attrs,
+	)
+}