60 struct SsaEnv {  struct
80   SsaEnv* ssa_env;  // SSA renaming environment.
87   SsaEnv* false_env;
88   SsaEnv* merge_env;
89   SsaEnv** case_envs;
174   SsaEnv* ssa_env_;
188     SsaEnv* ssa_env = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv)));  in InitSsaEnv()
190     ssa_env->state = SsaEnv::kReached;  in InitSsaEnv()
338             SsaEnv* break_env = ssa_env_;  in DecodeFunctionBody()
352             SsaEnv* break_env = ssa_env_;  in DecodeFunctionBody()
354             SsaEnv* cont_env = Steal(break_env);  in DecodeFunctionBody()
358             if (ssa_env_->go()) ssa_env_->state = SsaEnv::kReached;  in DecodeFunctionBody()
443           ssa_env_->Kill(SsaEnv::kControlEnd);  in DecodeFunctionBody()
587   void PushBlock(SsaEnv* ssa_env) {  in PushBlock()
699           SsaEnv* false_env = ssa_env_;  in Reduce()
700           SsaEnv* true_env = Split(ssa_env_);  in Reduce()
708           SsaEnv* merge = env->merge_env;  in Reduce()
710             merge->state = SsaEnv::kReached;  in Reduce()
722           SsaEnv* merge_env = ssa_env_;  in Reduce()
726           SsaEnv* false_env = Split(ssa_env_);  in Reduce()
727           SsaEnv* true_env = Steal(ssa_env_);  in Reduce()
737           SsaEnv* false_env = ifs_.back().false_env;  in Reduce()
797           SsaEnv* fenv = ssa_env_;  in Reduce()
798           SsaEnv* tenv = Split(fenv);  in Reduce()
812             SsaEnv* break_env = ssa_env_;  in Reduce()
834           SsaEnv** case_envs = zone_->NewArray<SsaEnv*>(case_count);  in Reduce()
840           SsaEnv* break_env = ssa_env_;  in Reduce()
842           SsaEnv* copy = Steal(break_env);  in Reduce()
850             SsaEnv* env = Split(copy);  in Reduce()
856               SsaEnv* tenv = blocks_[blocks_.size() - depth - 1].ssa_env;  in Reduce()
872             SsaEnv* next = block->ssa_env;  in Reduce()
878             SsaEnv* next = ifs_.back().case_envs[p->index - 1];  in Reduce()
896           ssa_env_->Kill(SsaEnv::kControlEnd);  in Reduce()
1043   void MergeIntoProduction(Production* p, SsaEnv* target, Tree* expr) {  in MergeIntoProduction()
1046     bool first = target->state == SsaEnv::kUnreachable;  in MergeIntoProduction()
1111   void SetEnv(const char* reason, SsaEnv* env) {  in SetEnv()
1126   void Goto(SsaEnv* from, SsaEnv* to) {  in Goto()
1130       case SsaEnv::kUnreachable: {  // Overwrite destination.  in Goto()
1131         to->state = SsaEnv::kReached;  in Goto()
1137       case SsaEnv::kReached: {  // Create a new merge.  in Goto()
1138         to->state = SsaEnv::kMerged;  in Goto()
1161       case SsaEnv::kMerged: {  in Goto()
1220       SsaEnv* cont_env = ssa_env_;  in BuildInfiniteLoop()
1222       ssa_env_->state = SsaEnv::kReached;  in BuildInfiniteLoop()
1227   void PrepareForLoop(SsaEnv* env) {  in PrepareForLoop()
1229       env->state = SsaEnv::kMerged;  in PrepareForLoop()
1243   SsaEnv* Split(SsaEnv* from) {  in Split()
1245     SsaEnv* result = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv)));  in Split()
1249     result->state = from->state == SsaEnv::kUnreachable ? SsaEnv::kUnreachable  in Split()
1250                                                         : SsaEnv::kReached;  in Split()
1253       result->state = SsaEnv::kReached;  in Split()
1258       result->state = SsaEnv::kUnreachable;  in Split()
1267   SsaEnv* Steal(SsaEnv* from) {  in Steal()
1270     SsaEnv* result = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv)));  in Steal()
1271     result->state = SsaEnv::kReached;  in Steal()
1275     from->Kill(SsaEnv::kUnreachable);  in Steal()
1280   SsaEnv* UnreachableEnv() {  in UnreachableEnv()
1281     SsaEnv* result = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv)));  in UnreachableEnv()
1282     result->state = SsaEnv::kUnreachable;  in UnreachableEnv()