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| author | Xavier Leroy <xavier.leroy@inria.fr> | 2016-05-17 15:37:56 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavier.leroy@inria.fr> | 2016-05-17 15:37:56 +0200 |
| commit | 82f9d1f96b30106a338e77ec83b7321c2c65f929 (patch) | |
| tree | 6b8bb30473b1385f8b84fe1600f592c2bd4abed7 /backend/Tunnelingproof.v | |
| parent | 672393ef623acb3e230a8019d51c87e051a7567a (diff) | |
| download | compcert-82f9d1f96b30106a338e77ec83b7321c2c65f929.tar.gz compcert-82f9d1f96b30106a338e77ec83b7321c2c65f929.zip | |
Introduce register pairs to describe calling conventions more precisely
This commit changes the loc_arguments and loc_result functions that describe calling conventions so that each argument/result can be mapped either to a single location or (in the case of a 64-bit integer) to a pair of two 32-bit locations.
In the current CompCert, all arguments/results of type Tlong are systematically split in two 32-bit halves. We will need to change this in the future to support 64-bit processors. The alternative approach implemented by this commit enables the loc_arguments and loc_result functions to describe precisely which arguments need splitting. Eventually, the remainder of CompCert should not assume anything about splitting 64-bit types in two halves.
Summary of changes:
- AST: introduce the type "rpair A" of register pairs
- Conventions1, Conventions: use it when describing calling conventions
- LTL, Linear, Mach, Asm: honor the new calling conventions when observing external calls
- Events: suppress external_call', no longer useful
- All passes from Allocation to Asmgen: adapt accordingly.
Diffstat (limited to 'backend/Tunnelingproof.v')
| -rw-r--r-- | backend/Tunnelingproof.v | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/backend/Tunnelingproof.v b/backend/Tunnelingproof.v index 4f1f8143..4f3ba5cb 100644 --- a/backend/Tunnelingproof.v +++ b/backend/Tunnelingproof.v @@ -367,7 +367,7 @@ Proof. (* external function *) left; simpl; econstructor; split. eapply exec_function_external; eauto. - eapply external_call_symbols_preserved'; eauto. apply senv_preserved. + eapply external_call_symbols_preserved; eauto. apply senv_preserved. simpl. econstructor; eauto. (* return *) inv H3. inv H1. @@ -395,7 +395,7 @@ Lemma transf_final_states: forall st1 st2 r, match_states st1 st2 -> final_state st1 r -> final_state st2 r. Proof. - intros. inv H0. inv H. inv H6. econstructor; eauto. + intros. inv H0. inv H. inv H5. econstructor; eauto. Qed. Theorem transf_program_correct: |