Move the symbolic executor to its own file, and do some renaming to be consistent with the paper.

_CoqProject

@@ -12,7 +12,8 @@ theories/c_translation/proofmode.v
 theories/c_translation/translation.v
 theories/vcgen/dcexpr.v
 theories/vcgen/denv.v
-theories/vcgen/vcgen.v
+theories/vcgen/vcg.v
+theories/vcgen/forward.v
 theories/vcgen/proofmode.v
 theories/vcgen/reification.v
 theories/tests/basics.v

theories/vcgen/proofmode.v

 From iris_c.c_translation Require Export translation.
-From iris_c.vcgen Require Import vcgen denv reification.
+From iris_c.vcgen Require Import vcg denv reification.
 From iris.proofmode Require Import environments coq_tactics.
 Import env_notations.
 
@@ -88,7 +88,7 @@ Section tactics.
   Lemma tac_vcg E1 E2 Γp Γs_in Γs_out m c e de R Φ :
     IntoDEnv [] E1 Γs_in Γs_out m →
     IntoDCExpr E1 E2 e de →
-    envs_entails (Envs Γp Γs_out c) (vcg_wp_while E2 (dcexpr_size de) m de R
+    envs_entails (Envs Γp Γs_out c) (vcg_while E2 (dcexpr_size de) m de R
       (λ E3 m dv, wand_denv_interp E3 m (Φ (dval_interp E3 dv)))) →
     envs_entails (Envs Γp Γs_in c) (AWP e @ R {{ Φ }}).
   Proof.
@@ -99,9 +99,9 @@ Section tactics.
     iDestruct (Hentails with "[$HΓs $HΓp]") as "HΓs".
     { iPureIntro; constructor; naive_solver. }
     iApply (awp_wand with "[-]").
-    { iApply (vcg_wp_while_correct with "[Hm] HΓs"); eauto using denv_wf_mono.
+    { iApply (vcg_while_correct with "[Hm] HΓs"); eauto using denv_wf_mono.
       iApply (denv_interp_mono with "Hm"); eauto. }
-    rewrite /vcg_wp_continuation. iIntros (v) "H".
+    rewrite /vcg_continuation. iIntros (v) "H".
     iDestruct "H" as (E3 dv m' -> ???) "[Hm HΦ]".
     by iApply (wand_denv_interp_spec with "HΦ").
   Qed.
@@ -110,7 +110,7 @@ Section tactics.
     IntoDEnv E1 E2 Γs_in Γs_out m →
     IntoDVal E2 E3 v dv →
     envs_entails (Envs Γp Γs_out c) (Φ E3 m dv) →
-    envs_entails (Envs Γp Γs_in c) (vcg_wp_continuation E1 Φ v).
+    envs_entails (Envs Γp Γs_in c) (vcg_continuation E1 Φ v).
   Proof.
     intros [HΓ ????] [-> ??]; rewrite !envs_entails_eq /= /of_envs.
     iIntros (Hentails) "(Hwf & #HΓp & HΓs)".
@@ -124,7 +124,7 @@ Section tactics.
 End tactics.
 
 (* Make sure users do not see auxiliary junk *)
-Arguments vcg_wp_continuation {_ _ _ _}.
+Arguments vcg_continuation {_ _ _ _}.
 
 Ltac vcg :=
   iStartProof;