Add yacc and lex support

Add support for yacc (.y or .yy) and lex (.l or .ll) files.  Also
tweak locations of .o files for normal and generated sources to
makes sure they don't collide.

Change-Id: I03172cddbdc022525bf392a81d72050406b8cdb3

1 files changed, 109 insertions, 0 deletions

diff --git a/cc/gen.go b/cc/gen.go
new file mode 100644
index 00000000..bd91d647
--- /dev/null
+++ b/cc/gen.go
@@ -0,0 +1,109 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cc
+
+// This file generates the final rules for compiling all C/C++.  All properties related to
+// compiling should have been translated into builderFlags or another argument to the Transform*
+// functions.
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/google/blueprint"
+	"github.com/google/blueprint/pathtools"
+
+	"android/soong/common"
+)
+
+func init() {
+	pctx.StaticVariable("lexCmd", "${SrcDir}/prebuilts/misc/${HostPrebuiltTag}/flex/flex-2.5.39")
+	pctx.StaticVariable("yaccCmd", "${SrcDir}/prebuilts/misc/${HostPrebuiltTag}/bison/bison")
+	pctx.StaticVariable("yaccDataDir", "${SrcDir}/external/bison/data")
+}
+
+var (
+	yacc = pctx.StaticRule("yacc",
+		blueprint.RuleParams{
+			Command: "BISON_PKGDATADIR=$yaccDataDir $yaccCmd -d $yaccFlags -o $cppFile $in && " +
+				"cp -f $hppFile $hFile",
+			Description: "yacc $out",
+		},
+		"yaccFlags", "cppFile", "hppFile", "hFile")
+
+	lex = pctx.StaticRule("lex",
+		blueprint.RuleParams{
+			Command:     "$lexCmd -o$out $in",
+			Description: "lex $out",
+		})
+)
+
+func genYacc(ctx common.AndroidModuleContext, yaccFile, yaccFlags string) (cppFile, headerFile string) {
+	cppFile = strings.TrimPrefix(yaccFile, common.ModuleSrcDir(ctx))
+	cppFile = filepath.Join(common.ModuleGenDir(ctx), cppFile)
+	cppFile = pathtools.ReplaceExtension(cppFile, "cpp")
+	hppFile := pathtools.ReplaceExtension(cppFile, "hpp")
+	headerFile = pathtools.ReplaceExtension(cppFile, "h")
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:      yacc,
+		Outputs:   []string{cppFile, headerFile},
+		Inputs:    []string{yaccFile},
+		Implicits: []string{"$yaccCmd"},
+		Args: map[string]string{
+			"yaccFlags": yaccFlags,
+			"cppFile":   cppFile,
+			"hppFile":   hppFile,
+			"hFile":     headerFile,
+		},
+	})
+
+	return cppFile, headerFile
+}
+
+func genLex(ctx common.AndroidModuleContext, lexFile string) (cppFile string) {
+	cppFile = strings.TrimPrefix(lexFile, common.ModuleSrcDir(ctx))
+	cppFile = filepath.Join(common.ModuleGenDir(ctx), cppFile)
+	cppFile = pathtools.ReplaceExtension(cppFile, "cpp")
+
+	ctx.Build(pctx, blueprint.BuildParams{
+		Rule:      lex,
+		Outputs:   []string{cppFile},
+		Inputs:    []string{lexFile},
+		Implicits: []string{"$lexCmd"},
+	})
+
+	return cppFile
+}
+
+func genSources(ctx common.AndroidModuleContext, srcFiles []string,
+	buildFlags builderFlags) ([]string, []string) {
+
+	var deps []string
+
+	for i, srcFile := range srcFiles {
+		switch filepath.Ext(srcFile) {
+		case ".y", ".yy":
+			cppFile, headerFile := genYacc(ctx, srcFile, buildFlags.yaccFlags)
+			srcFiles[i] = cppFile
+			deps = append(deps, headerFile)
+		case ".l", ".ll":
+			cppFile := genLex(ctx, srcFile)
+			srcFiles[i] = cppFile
+		}
+	}
+
+	return srcFiles, deps
+}