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[svn r235] rough port of GDC's inline assembler code, unfinished
author ChristianK
date Thu, 05 Jun 2008 19:22:37 +0200
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children ccc2e6898a78
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219
761c8352f494 [svn r235] rough port of GDC's inline assembler code, unfinished
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1 // Taken from GDC source tree, licence unclear?
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2 //
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3 // Taken from an earlier version of DMD -- why is it missing from 0.79?
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4
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5 //#include "d-gcc-includes.h"
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6 //#include "total.h"
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7 #include "dmd/statement.h"
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8 #include "dmd/scope.h"
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9 #include "dmd/declaration.h"
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10 #include "dmd/dsymbol.h"
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11
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12 #include "llvm/InlineAsm.h"
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13
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14 #include <cassert>
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15 #include <deque>
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16 #include <iostream>
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17 #include <sstream>
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18
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19 //#include "d-lang.h"
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20 //#include "d-codegen.h"
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21
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22 typedef enum {
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23 Arg_Integer,
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24 Arg_Pointer,
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25 Arg_Memory,
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26 Arg_FrameRelative,
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27 Arg_LocalSize,
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28 Arg_Dollar
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29 } AsmArgType;
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30
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31 typedef enum {
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32 Mode_Input,
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33 Mode_Output,
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34 Mode_Update
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35 } AsmArgMode;
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36
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37 struct AsmArg {
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38 AsmArgType type;
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39 Expression * expr;
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40 AsmArgMode mode;
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41 AsmArg(AsmArgType type, Expression * expr, AsmArgMode mode) {
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42 this->type = type;
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43 this->expr = expr;
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44 this->mode = mode;
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45 }
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46 };
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47
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48 struct AsmCode {
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49 char * insnTemplate;
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50 unsigned insnTemplateLen;
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51 Array args; // of AsmArg
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52 unsigned moreRegs;
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53 unsigned dollarLabel;
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54 int clobbersMemory;
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55 AsmCode() {
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56 insnTemplate = NULL;
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57 insnTemplateLen = 0;
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58 moreRegs = 0;
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59 dollarLabel = 0;
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60 clobbersMemory = 0;
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61 }
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62 };
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63
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64 llvm::InlineAsm*
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65 d_build_asm_stmt(std::string code, std::deque<DValue*> const& output_values, std::deque<DValue*> const& input_values, std::string constraints)
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66 {
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67 //FIXME: Return InlineAsm::get(..) here.
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68 return NULL;
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69 }
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70
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71 AsmStatement::AsmStatement(Loc loc, Token *tokens) :
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72 Statement(loc)
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73 {
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74 this->tokens = tokens; // Do I need to copy these?
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75 asmcode = 0;
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76 asmalign = 0;
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77 refparam = 0;
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78 naked = 0;
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79 regs = 0;
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80 }
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81
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82 Statement *AsmStatement::syntaxCopy()
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83 {
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84 // copy tokens? copy 'code'?
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85 AsmStatement * a_s = new AsmStatement(loc,tokens);
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86 a_s->asmcode = asmcode;
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87 a_s->refparam = refparam;
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88 a_s->naked = naked;
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89 a_s->regs = a_s->regs;
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90 return a_s;
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91 }
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92
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93 void AsmStatement::toCBuffer(OutBuffer *buf, HdrGenState *hgs)
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94 {
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95 bool sep = 0, nsep = 0;
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96 buf->writestring("asm { ");
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97
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98 for (Token * t = tokens; t; t = t->next) {
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99 switch (t->value) {
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100 case TOKlparen:
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101 case TOKrparen:
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102 case TOKlbracket:
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103 case TOKrbracket:
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104 case TOKcolon:
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105 case TOKsemicolon:
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106 case TOKcomma:
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107 case TOKstring:
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108 case TOKcharv:
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109 case TOKwcharv:
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110 case TOKdcharv:
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111 nsep = 0;
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112 break;
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113 default:
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114 nsep = 1;
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115 }
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116 if (sep + nsep == 2)
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117 buf->writeByte(' ');
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118 sep = nsep;
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119 buf->writestring(t->toChars());
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120 }
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121 buf->writestring("; }");
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122 buf->writenl();
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123 }
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124
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125 int AsmStatement::comeFrom()
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126 {
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127 return FALSE;
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128 }
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129
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130 /* GCC does not support jumps from asm statements. When optimization
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131 is turned on, labels referenced only from asm statements will not
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132 be output at the correct location. There are ways around this:
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133
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134 1) Reference the label with a reachable goto statement
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135 2) Have reachable computed goto in the function
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136 3) Hack cfgbuild.c to act as though there is a computed goto.
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137
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138 These are all pretty bad, but if would be nice to be able to tell
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139 GCC not to optimize in this case (even on per label/block basis).
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140
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141 The current solution is output our own private labels (as asm
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142 statements) along with the "real" label. If the label happens to
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143 be referred to by a goto statement, the "real" label will also be
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144 output in the correct location.
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145
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146 Also had to add 'asmLabelNum' to LabelDsymbol to indicate it needs
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147 special processing.
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148
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149 (junk) d-lang.cc:916:case LABEL_DECL: // C doesn't do this. D needs this for referencing labels in inline assembler since there may be not goto referencing it.
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150
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151 */
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152
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153 static unsigned d_priv_asm_label_serial = 0;
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154
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155 // may need to make this target-specific
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156 static void d_format_priv_asm_label(char * buf, unsigned n)
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157 {
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158 //ASM_GENERATE_INTERNAL_LABEL(buf, "LDASM", n);//inserts a '*' for use with assemble_name
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159 sprintf(buf, ".LDASM%u", n);
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160 }
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161
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162 void
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163 d_expand_priv_asm_label(IRState * irs, unsigned n)
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164 {
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165 /* char buf[64];
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166 d_format_priv_asm_label(buf, n);
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167 strcat(buf, ":");
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168 tree insnt = build_string(strlen(buf), buf);
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169 #if D_GCC_VER < 40
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170 expand_asm(insnt, 1);
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171 #else
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172 tree t = d_build_asm_stmt(insnt, NULL_TREE, NULL_TREE, NULL_TREE);
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173 ASM_VOLATILE_P( t ) = 1;
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174 ASM_INPUT_P( t) = 1; // what is this doing?
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175 irs->addExp(t);
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176 #endif*/
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177 }
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178
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179
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180 // StringExp::toIR usually adds a NULL. We don't want that...
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181
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182 /*static tree
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183 naturalString(Expression * e)
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184 {
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185 // don't fail, just an error?
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186 assert(e->op == TOKstring);
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187 StringExp * s = (StringExp *) e;
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188 assert(s->sz == 1);
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189 return build_string(s->len, (char *) s->string);
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190 }*/
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191
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192
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193 #include "d-asm-i386.h"
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194
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195 bool d_have_inline_asm() { return true; }
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196
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197 Statement *AsmStatement::semantic(Scope *sc)
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198 {
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199
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200 sc->func->inlineAsm = 1;
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201 sc->func->inlineStatus = ILSno; // %% not sure
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202 // %% need to set DECL_UNINLINABLE too?
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203 sc->func->hasReturnExp = 1; // %% DMD does this, apparently...
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204
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205 // empty statement -- still do the above things because they might be expected?
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206 if (! tokens)
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207 return this;
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208
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209 AsmProcessor ap(sc, this);
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210 ap.run();
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211 return this;
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212 }
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213
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214 void
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215 AsmStatement::toIR(IRState * irs)
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216 {
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217 // FIXME
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218 // gen.doLineNote( loc );
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219
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220 if (! asmcode)
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221 return;
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222
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223 static std::string i_cns = "i";
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224 static std::string p_cns = "p";
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225 static std::string m_cns = "m";
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226 static std::string mw_cns = "=m";
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227 static std::string mrw_cns = "+m";
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228 static std::string memory_name = "memory";
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229
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230 AsmCode * code = (AsmCode *) asmcode;
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231 std::deque<DValue*> input_values;
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232 std::deque<std::string> input_constraints;
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233 std::deque<DValue*> output_values;
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234 std::deque<std::string> output_constraints;
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235 std::deque<std::string> clobbers;
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236
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237 // FIXME
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238 #define HOST_WIDE_INT long
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239 HOST_WIDE_INT var_frame_offset; // "frame_offset" is a macro
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240 bool clobbers_mem = code->clobbersMemory;
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241 int input_idx = 0;
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242 int n_outputs = 0;
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243 int arg_map[10];
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244
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245 assert(code->args.dim <= 10);
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246
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247 for (unsigned i = 0; i < code->args.dim; i++) {
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248 AsmArg * arg = (AsmArg *) code->args.data[i];
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249
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250 bool is_input = true;
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251 DValue* arg_val;
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252 std::string cns;
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253
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254 switch (arg->type) {
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255 case Arg_Integer:
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256 arg_val = arg->expr->toElem(irs);
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257 do_integer:
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258 cns = i_cns;
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259 break;
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260 case Arg_Pointer:
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261 // FIXME
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262 /* if (arg->expr->op == TOKvar)
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263 arg_val = ((VarExp *) arg->expr)->var->toSymbol()->Stree;
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264 else if (arg->expr->op == TOKdsymbol) {
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265 arg_val = irs->getLabelTree( (LabelDsymbol *) ((DsymbolExp *) arg->expr)->s );
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266 } else
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267 assert(0);
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268 arg_val = irs->addressOf(arg_val);*/
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269 cns = p_cns;
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270 break;
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271 case Arg_Memory:
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272 // FIXME
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273 /* if (arg->expr->op == TOKvar)
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274 arg_val = ((VarExp *) arg->expr)->var->toSymbol()->Stree;
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275 else
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276 arg_val = arg->expr->toElem(irs);
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277 if (DECL_P( arg_val ))
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278 TREE_ADDRESSABLE( arg_val ) = 1;*/
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279 switch (arg->mode) {
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280 case Mode_Input: cns = m_cns; break;
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281 case Mode_Output: cns = mw_cns; is_input = false; break;
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282 case Mode_Update: cns = mrw_cns; is_input = false; break;
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283 default: assert(0); break;
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284 }
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285 break;
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286 case Arg_FrameRelative:
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287 // FIXME
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288 /* if (arg->expr->op == TOKvar)
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289 arg_val = ((VarExp *) arg->expr)->var->toSymbol()->Stree;
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290 else
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291 assert(0);*/
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292 if ( getFrameRelativeValue(arg_val, & var_frame_offset) ) {
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293 // arg_val = irs->integerConstant(var_frame_offset);
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294 cns = i_cns;
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295 } else {
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296 this->error("%s", "argument not frame relative");
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297 return;
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298 }
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299 if (arg->mode != Mode_Input)
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300 clobbers_mem = true;
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301 break;
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302 case Arg_LocalSize:
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303 // FIXME
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304 /* var_frame_offset = cfun->x_frame_offset;
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305 if (var_frame_offset < 0)
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306 var_frame_offset = - var_frame_offset;
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307 arg_val = irs->integerConstant( var_frame_offset );*/
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308 goto do_integer;
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309 default:
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310 assert(0);
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311 }
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312
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313 if (is_input) {
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314 arg_map[i] = --input_idx;
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315 //inputs.cons(tree_cons(NULL_TREE, cns, NULL_TREE), arg_val);
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316 input_values.push_back(arg_val);
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317 input_constraints.push_back(cns);
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318 } else {
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319 arg_map[i] = n_outputs++;
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320 //outputs.cons(tree_cons(NULL_TREE, cns, NULL_TREE), arg_val);
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321 output_values.push_back(arg_val);
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322 output_constraints.push_back(cns);
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323 }
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324 }
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325
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326 // Telling GCC that callee-saved registers are clobbered makes it preserve
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327 // those registers. This changes the stack from what a naked function
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328 // expects.
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329
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330 // FIXME
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331 // if (! irs->func->naked) {
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332 for (int i = 0; i < 32; i++) {
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333 if (regs & (1 << i)) {
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334 //clobbers.cons(NULL_TREE, regInfo[i].gccName);
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335 clobbers.push_back(regInfo[i].gccName);
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336 }
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337 }
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338 for (int i = 0; i < 32; i++) {
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339 if (code->moreRegs & (1 << (i-32))) {
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340 //clobbers.cons(NULL_TREE, regInfo[i].gccName);
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341 clobbers.push_back(regInfo[i].gccName);
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342 }
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343 }
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344 if (clobbers_mem)
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345 clobbers.push_back(memory_name);
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346 //clobbers.cons(NULL_TREE, memory_name);
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347 // }
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348
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349
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350 // Remap argument numbers
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351 for (unsigned i = 0; i < code->args.dim; i++) {
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352 if (arg_map[i] < 0)
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353 arg_map[i] = -arg_map[i] - 1 + n_outputs;
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354 }
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355
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356 bool pct = false;
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357 char * p = code->insnTemplate;
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358 char * q = p + code->insnTemplateLen;
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359 //printf("start: %.*s\n", code->insnTemplateLen, code->insnTemplate);
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360 while (p < q) {
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361 if (pct) {
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362 if (*p >= '0' && *p <= '9') {
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363 // %% doesn't check against nargs
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364 *p = '0' + arg_map[*p - '0'];
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365 pct = false;
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366 } else if (*p == '$') {
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367 pct = false;
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368 }
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369 //assert(*p == '%');// could be 'a', etc. so forget it..
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370 } else if (*p == '$')
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371 pct = true;
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372 ++p;
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373 }
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374
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375 //printf("final: %.*s\n", code->insnTemplateLen, code->insnTemplate);
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376
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377 std::string insnt(code->insnTemplate, code->insnTemplateLen);
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378
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379 // rewrite GCC-style constraints to LLVM-style constraints
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380 std::string llvmConstraints;
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381 int n = 0;
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382 typedef std::deque<std::string>::iterator it;
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383 for(it i = output_constraints.begin(), e = output_constraints.end(); i != e; ++i, ++n) {
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384 // rewrite update constraint to in and out constraints
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385 if((*i)[0] == '+') {
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386 (*i)[0] = '=';
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387 std::string input_constraint;
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388 std::stringstream ss;
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389 ss << n;
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390 ss >> input_constraint;
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391 //FIXME: I think multiple inout constraints will mess up the order!
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392 input_constraints.push_front(input_constraint);
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393 input_values.push_front(output_values[n]);
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394 }
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395 llvmConstraints += *i;
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396 llvmConstraints += ",";
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397 }
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398 for(it i = input_constraints.begin(), e = input_constraints.end(); i != e; ++i) {
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399 llvmConstraints += *i;
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400 llvmConstraints += ",";
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401 }
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402 for(it i = clobbers.begin(), e = clobbers.end(); i != e; ++i) {
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403 llvmConstraints += "~{" + *i + "},";
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404 }
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405 llvmConstraints.resize(llvmConstraints.size()-1);
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406
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407 std::cout << "Inline Asm code: " << std::endl;
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408 std::cout << insnt << std::endl;
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409 std::cout << "LLVM constraints: " << llvmConstraints << std::endl;
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410 std::cout << std::endl;
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411
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412 llvm::InlineAsm* t = d_build_asm_stmt(insnt, output_values, input_values, llvmConstraints);
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413 // FIXME
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414 //ASM_VOLATILE_P( t ) = 1;
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415 //irs->addExp( t );
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416 if (code->dollarLabel)
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417 d_expand_priv_asm_label(irs, code->dollarLabel);
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418 }