dmd.backend.goh source code

1 /**
2  * Global optimizer declarations
3  *
4  * Compiler implementation of the
5  * $(LINK2 https://www.dlang.org, D programming language).
6  *
7  * Copyright:   Copyright (C) 1986-1998 by Symantec
8  *              Copyright (C) 2000-2023 by The D Language Foundation, All Rights Reserved
9  * Authors:     $(LINK2 https://www.digitalmars.com, Walter Bright)
10  * License:     Distributed under the Boost Software License, Version 1.0.
11  *              https://www.boost.org/LICENSE_1_0.txt
12  * Source:      https://github.com/dlang/dmd/blob/master/src/dmd/backend/goh.d
13  */
14 
15 module dmd.backend.goh;
16 
17 import core.stdc.stdio;
18 import core.stdc.stdlib;
19 import core.stdc.string;
20 import core.stdc.time;
21 
22 import dmd.backend.cc;
23 import dmd.backend.cdef;
24 import dmd.backend.oper;
25 import dmd.backend.global;
26 import dmd.backend.el;
27 import dmd.backend.symtab;
28 import dmd.backend.ty;
29 import dmd.backend.type;
30 
31 import dmd.backend.barray;
32 import dmd.backend.dlist;
33 import dmd.backend.dvec;
34 
35 nothrow:
36 @safe:
37 
38 /***************************************
39  * Bit masks for various optimizations.
40  */
41 
42 alias mftype = uint;        /* a type big enough for all the flags  */
43 enum
44 {
45     MFdc    = 1,               // dead code
46     MFda    = 2,               // dead assignments
47     MFdv    = 4,               // dead variables
48     MFreg   = 8,               // register variables
49     MFcse   = 0x10,            // global common subexpressions
50     MFvbe   = 0x20,            // very busy expressions
51     MFtime  = 0x40,            // favor time (speed) over space
52     MFli    = 0x80,            // loop invariants
53     MFliv   = 0x100,           // loop induction variables
54     MFcp    = 0x200,           // copy propagation
55     MFcnp   = 0x400,           // constant propagation
56     MFloop  = 0x800,           // loop till no more changes
57     MFtree  = 0x1000,          // optelem (tree optimization)
58     MFlocal = 0x2000,          // localize expressions
59     MFall   = 0xFFFF,          // do everything
60 }
61 
62 /**********************************
63  * Definition elem vector, used for reaching definitions.
64  */
65 
66 struct DefNode
67 {
68     elem    *DNelem;        // pointer to definition elem
69     block   *DNblock;       // pointer to block that the elem is in
70     vec_t    DNunambig;     // vector of unambiguous definitions
71 }
72 
73 /* Global Optimizer variables
74  */
75 struct GlobalOptimizer
76 {
77     mftype mfoptim;
78     uint changes;       // # of optimizations performed
79 
80     Barray!DefNode defnod;    // array of definition elems
81     uint unambigtop;    // number of unambiguous defininitions ( <= deftop )
82 
83     Barray!(vec_base_t) dnunambig;  // pool to allocate DNunambig vectors from
84 
85     Barray!(elem*) expnod;      // array of expression elems
86     uint exptop;        // top of expnod[]
87     Barray!(block*) expblk;     // parallel array of block pointers
88 
89     vec_t defkill;      // vector of AEs killed by an ambiguous definition
90     vec_t starkill;     // vector of AEs killed by a definition of something that somebody could be
91                         // pointing to
92     vec_t vptrkill;     // vector of AEs killed by an access
93 }
94 
95 public import dmd.backend.var : go;
96 public import dmd.backend.gdag : builddags, boolopt;
97 public import dmd.backend.gflow : flowrd, flowlv, flowvbe, flowcp, flowae, genkillae;
98 public import dmd.backend.glocal : localize;
99 public import dmd.backend.gloop : blockinit, compdom, loopopt, updaterd;
100 public import dmd.backend.gother : constprop, copyprop, rmdeadass, elimass, deadvar, verybusyexp, listrds;
101 public import dmd.backend.gsroa : sliceStructs;