diff options
Diffstat (limited to 'arm/Asmgen.v')
| -rw-r--r-- | arm/Asmgen.v | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/arm/Asmgen.v b/arm/Asmgen.v index c7d7712..d158c77 100644 --- a/arm/Asmgen.v +++ b/arm/Asmgen.v @@ -593,7 +593,7 @@ Definition transl_instr (f: Mach.function) (i: Mach.instruction) (** Translation of a code sequence *) -Definition r10_is_parent (before: bool) (i: Mach.instruction) : bool := +Definition it1_is_parent (before: bool) (i: Mach.instruction) : bool := match i with | Msetstack src ofs ty => before | Mgetparam ofs ty dst => negb (mreg_eq dst IT1) @@ -601,14 +601,32 @@ Definition r10_is_parent (before: bool) (i: Mach.instruction) : bool := | _ => false end. -Fixpoint transl_code (f: Mach.function) (il: list Mach.instruction) (r10p: bool) := +(** This is the naive definition that we no longer use because it + is not tail-recursive. It is kept as specification. *) + +Fixpoint transl_code (f: Mach.function) (il: list Mach.instruction) (it1p: bool) := match il with | nil => OK nil | i1 :: il' => - do k <- transl_code f il' (r10_is_parent r10p i1); - transl_instr f i1 r10p k + do k <- transl_code f il' (it1_is_parent it1p i1); + transl_instr f i1 it1p k end. +(** This is an equivalent definition in continuation-passing style + that runs in constant stack space. *) + +Fixpoint transl_code_rec (f: Mach.function) (il: list Mach.instruction) + (it1p: bool) (k: code -> res code) := + match il with + | nil => k nil + | i1 :: il' => + transl_code_rec f il' (it1_is_parent it1p i1) + (fun c1 => do c2 <- transl_instr f i1 it1p c1; k c2) + end. + +Definition transl_code' (f: Mach.function) (il: list Mach.instruction) (it1p: bool) := + transl_code_rec f il it1p (fun c => OK c). + (** Translation of a whole function. Note that we must check that the generated code contains less than [2^32] instructions, otherwise the offset part of the [PC] code pointer could wrap |