From 265fa07b34a813ba9d8249ddad82d71e6002c10d Mon Sep 17 00:00:00 2001 From: xleroy Date: Thu, 2 Sep 2010 12:42:19 +0000 Subject: Merge of the reuse-temps branch: - Reload temporaries are marked as destroyed (set to Vundef) across operations in the semantics of LTL, LTLin, Linear and Mach, allowing Asmgen to reuse them. - Added IA32 port. - Cleaned up float conversions and axiomatization of floats. git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1499 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e --- ia32/standard/Stacklayout.v | 76 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 ia32/standard/Stacklayout.v (limited to 'ia32/standard/Stacklayout.v') diff --git a/ia32/standard/Stacklayout.v b/ia32/standard/Stacklayout.v new file mode 100644 index 00000000..135aba1e --- /dev/null +++ b/ia32/standard/Stacklayout.v @@ -0,0 +1,76 @@ +(* *********************************************************************) +(* *) +(* The Compcert verified compiler *) +(* *) +(* Xavier Leroy, INRIA Paris-Rocquencourt *) +(* *) +(* Copyright Institut National de Recherche en Informatique et en *) +(* Automatique. All rights reserved. This file is distributed *) +(* under the terms of the INRIA Non-Commercial License Agreement. *) +(* *) +(* *********************************************************************) + +(** Machine- and ABI-dependent layout information for activation records. *) + +Require Import Coqlib. +Require Import Bounds. + +(** The general shape of activation records is as follows, + from bottom (lowest offsets) to top: +- Space for outgoing arguments to function calls. +- Back link to parent frame +- Return address (formally; it's actually pushed elsewhere) +- Local stack slots of integer type. +- Saved values of integer callee-save registers used by the function. +- Local stack slots of float type. +- Saved values of float callee-save registers used by the function. +- Space for the stack-allocated data declared in Cminor. + +To facilitate some of the proofs, the Cminor stack-allocated data +starts at offset 0; the preceding areas in the activation record +therefore have negative offsets. This part (with negative offsets) +is called the ``frame'', by opposition with the ``Cminor stack data'' +which is the part with positive offsets. + +The [frame_env] compilation environment records the positions of +the boundaries between areas in the frame part. +*) + +Definition fe_ofs_arg := 0. + +Record frame_env : Type := mk_frame_env { + fe_size: Z; + fe_ofs_link: Z; + fe_ofs_retaddr: Z; + fe_ofs_int_local: Z; + fe_ofs_int_callee_save: Z; + fe_num_int_callee_save: Z; + fe_ofs_float_local: Z; + fe_ofs_float_callee_save: Z; + fe_num_float_callee_save: Z +}. + +(** Computation of the frame environment from the bounds of the current + function. *) + +Definition make_env (b: bounds) := + let olink := 4 * b.(bound_outgoing) in (* back link *) + let oretaddr := olink + 4 in (* return address *) + let oil := oretaddr + 4 in (* integer locals *) + let oics := oil + 4 * b.(bound_int_local) in (* integer callee-saves *) + let oendi := oics + 4 * b.(bound_int_callee_save) in + let ofl := align oendi 8 in (* float locals *) + let ofcs := ofl + 8 * b.(bound_float_local) in (* float callee-saves *) + let sz := ofcs + 8 * b.(bound_float_callee_save) in (* total frame size *) + mk_frame_env sz olink oretaddr + oil oics b.(bound_int_callee_save) + ofl ofcs b.(bound_float_callee_save). + + +Remark align_float_part: + forall b, + 4 * bound_outgoing b + 4 + 4 + 4 * bound_int_local b + 4 * bound_int_callee_save b <= + align (4 * bound_outgoing b + 4 + 4 + 4 * bound_int_local b + 4 * bound_int_callee_save b) 8. +Proof. + intros. apply align_le. omega. +Qed. -- cgit