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gerrit-public.fairphone.software / fp2-dev / platform / dalvik / f6789277a9d25379bf43ffc39ef091db722dd5af / . / vm / compiler / codegen / arm / ArmRallocUtil.c
blob: bc643c15255671177cabbe74fdc6dc6b26649b27 [file] [log] [blame]
buzbeef6789272010-09-24 15:37:12 -0700[diff] [blame^]1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/*
18 * This file contains Arm-specific register alloction support.
19 */
20
21#include "compiler/CompilerUtility.h"
22#include "compiler/CompilerIR.h"
23#include "compiler/Dataflow.h"
24#include "ArmLIR.h"
25#include "Codegen.h"
26#include "compiler/codegen/Ralloc.h"
27
28/*
29 * Register usage for 16-bit Thumb systems:
30 * r0-r3: Temp/argument
31 * lr(r14): Temp for translations, return address for handlers
32 * rGLUE(r6): Pointer to InterpState
33 * rFP(r5): Dalvik frame pointer
34 * r4, r7: Temp for translations
35 * r8, r9, r10: Temp preserved across C calls
36 * r11, ip(r12): Temp not preserved across C calls
37 *
38 * Register usage for 32-bit Thumb systems:
39 * r0-r3: Temp/argument
40 * lr(r14): Temp for translations, return address for handlers
41 * rGLUE(r6): Pointer to InterpState
42 * rFP(r5): Dalvik frame pointer
43 * r4, r7: Temp for translations
44 * r8, r9, r10 Temp preserved across C calls
45 * r11, ip(r12): Temp not preserved across C calls
46 * fp0-fp15: Hot temps, not preserved across C calls
47 * fp16-fp31: Promotion pool
48 *
49 */
50
51/* Clobber all regs that might be used by an external C call */
52extern void dvmCompilerClobberCallRegs(CompilationUnit *cUnit)
53{
54 dvmCompilerClobber(cUnit, r0);
55 dvmCompilerClobber(cUnit, r1);
56 dvmCompilerClobber(cUnit, r2);
57 dvmCompilerClobber(cUnit, r3);
58 dvmCompilerClobber(cUnit, r9); // Need to do this?, be conservative
59 dvmCompilerClobber(cUnit, r11);
60 dvmCompilerClobber(cUnit, r12);
61 dvmCompilerClobber(cUnit, rlr);
62}
63
64/* Clobber all of the temps that might be used by a handler. */
65extern void dvmCompilerClobberHandlerRegs(CompilationUnit *cUnit)
66{
67 //TUNING: reduce the set of regs used by handlers. Only a few need lots.
68 dvmCompilerClobberCallRegs(cUnit);
69 dvmCompilerClobber(cUnit, r4PC);
70 dvmCompilerClobber(cUnit, r7);
71 dvmCompilerClobber(cUnit, r8);
72 dvmCompilerClobber(cUnit, r9);
73 dvmCompilerClobber(cUnit, r10);
74}
75
76extern RegLocation dvmCompilerGetReturnWide(CompilationUnit *cUnit)
77{
78 RegLocation res = LOC_C_RETURN_WIDE;
79 dvmCompilerClobber(cUnit, r0);
80 dvmCompilerClobber(cUnit, r1);
81 dvmCompilerMarkInUse(cUnit, r0);
82 dvmCompilerMarkInUse(cUnit, r1);
83 dvmCompilerMarkPair(cUnit, res.lowReg, res.highReg);
84 return res;
85}
86
87extern RegLocation dvmCompilerGetReturnWideAlt(CompilationUnit *cUnit)
88{
89 RegLocation res = LOC_C_RETURN_WIDE;
90 res.lowReg = r2;
91 res.highReg = r3;
92 dvmCompilerClobber(cUnit, r2);
93 dvmCompilerClobber(cUnit, r3);
94 dvmCompilerMarkInUse(cUnit, r2);
95 dvmCompilerMarkInUse(cUnit, r3);
96 dvmCompilerMarkPair(cUnit, res.lowReg, res.highReg);
97 return res;
98}
99
100extern RegLocation dvmCompilerGetReturn(CompilationUnit *cUnit)
101{
102 RegLocation res = LOC_C_RETURN;
103 dvmCompilerClobber(cUnit, r0);
104 dvmCompilerMarkInUse(cUnit, r0);
105 return res;
106}
107
108extern RegLocation dvmCompilerGetReturnAlt(CompilationUnit *cUnit)
109{
110 RegLocation res = LOC_C_RETURN;
111 res.lowReg = r1;
112 dvmCompilerClobber(cUnit, r1);
113 dvmCompilerMarkInUse(cUnit, r1);
114 return res;
115}