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Update profile_file discovery rules

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Bug: http://b/63768402

Profile files are searched in multiple directories in a pre-define list,
instead of just one.

PGO profile_file enforcement is also removed - profile_file dependency
and -fprofile-use are added iff the profile_file is present.

Test: Build https://android-review.googlesource.com/c/474805 with
.profdata files in vendor/google_data/pgo-profiles and
toolchain/pgo-profiles and verify expected behavior.

Change-Id: I2604713a8a7a682bd5c6bde569dc32335be5eca9
Merged-In: I2604713a8a7a682bd5c6bde569dc32335be5eca9
This commit is contained in:
Pirama Arumuga Nainar 2018-01-17 14:00:53 -08:00
parent 85935a2f9c
commit 64946fec54
1 changed files with 28 additions and 13 deletions
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41
cc/pgo.go
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@ -26,9 +26,12 @@ var (
// Add flags to ignore warnings that profiles are old or missing for
// some functions
profileUseOtherFlags = []string{"-Wno-backend-plugin"}
)
const pgoProfileProject = "toolchain/pgo-profiles"
pgoProfileProjects = []string{
"toolchain/pgo-profiles",
"vendor/google_data/pgo-profiles",
}
)
const profileInstrumentFlag = "-fprofile-generate=/data/local/tmp"
const profileSamplingFlag = "-gline-tables-only"
@ -84,6 +87,18 @@ func (props *PgoProperties) addProfileGatherFlags(ctx ModuleContext, flags Flags
return flags
}
func (props *PgoProperties) getPgoProfileFile(ctx ModuleContext) android.OptionalPath {
// Test if the profile_file is present in any of the pgoProfileProjects
for _, profileProject := range pgoProfileProjects {
path := android.ExistentPathForSource(ctx, "", profileProject, *props.Pgo.Profile_file)
if path.Valid() {
return path
}
}
return android.OptionalPathForPath(nil)
}
func (props *PgoProperties) profileUseFlag(ctx ModuleContext, file string) string {
if props.isInstrumentation() {
return fmt.Sprintf(profileUseInstrumentFormat, file)
@ -101,24 +116,28 @@ func (props *PgoProperties) profileUseFlags(ctx ModuleContext, file string) []st
}
func (props *PgoProperties) addProfileUseFlags(ctx ModuleContext, flags Flags) Flags {
// Return if 'pgo' property is not present in this module.
if !props.PgoPresent {
return flags
}
// Skip -fprofile-use if 'enable_profile_use' property is set
if props.Pgo.Enable_profile_use != nil && *props.Pgo.Enable_profile_use == false {
return flags
}
// If the PGO profiles project is found, and this module has PGO
// enabled, add flags to use the profile
if profilesDir := getPgoProfilesDir(ctx); props.PgoPresent && profilesDir.Valid() {
profileFile := android.PathForSource(ctx, profilesDir.String(), *props.Pgo.Profile_file)
profileUseFlags := props.profileUseFlags(ctx, profileFile.String())
// If the profile file is found, add flags to use the profile
if profileFile := props.getPgoProfileFile(ctx); profileFile.Valid() {
profileFilePath := profileFile.Path()
profileUseFlags := props.profileUseFlags(ctx, profileFilePath.String())
flags.CFlags = append(flags.CFlags, profileUseFlags...)
flags.LdFlags = append(flags.LdFlags, profileUseFlags...)
// Update CFlagsDeps and LdFlagsDeps so the module is rebuilt
// if profileFile gets updated
flags.CFlagsDeps = append(flags.CFlagsDeps, profileFile)
flags.LdFlagsDeps = append(flags.LdFlagsDeps, profileFile)
flags.CFlagsDeps = append(flags.CFlagsDeps, profileFilePath)
flags.LdFlagsDeps = append(flags.LdFlagsDeps, profileFilePath)
}
return flags
}
@ -164,10 +183,6 @@ func (props *PgoProperties) isPGO(ctx BaseModuleContext) bool {
return true
}
func getPgoProfilesDir(ctx ModuleContext) android.OptionalPath {
return android.ExistentPathForSource(ctx, "", pgoProfileProject)
}
func (pgo *pgo) begin(ctx BaseModuleContext) {
// TODO Evaluate if we need to support PGO for host modules
if ctx.Host() {