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annotate gen/programs.cpp @ 1499:df11cdec45a2

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Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324. The idea is to separate the notion of const from 'this variable can always be replaced with its initializer' in the frontend. To do that, I introduced Declaration::isSameAsInitializer, which is overridden in VarDeclaration to return false for constants that have a struct literal initializer. So {{{ const S s = S(5); void foo() { auto ps = &s; } // is no longer replaced by void foo() { auto ps = &(S(5)); } }}} To make taking the address of a struct constant with a struct-initializer outside of function scope possible, I made sure that AddrExp::optimize doesn't try to run the argument's optimization with WANTinterpret - that'd again replace the constant with a struct literal temporary.
author Christian Kamm <kamm incasoftware de>
date Sun, 14 Jun 2009 19:49:58 +0200
parents a376776e2301
children
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1299
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1 #include "gen/programs.h"
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2
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3 #include "llvm/Support/CommandLine.h"
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4 #include "llvm/System/Program.h"
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5
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6 #include "root.h" // error(char*)
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7 #include "mars.h" // fatal()
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8
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9 using namespace llvm;
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10
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11 static cl::opt<std::string> gcc("gcc",
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12 cl::desc("GCC to use for assembling and linking"),
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13 cl::Hidden,
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14 cl::ZeroOrMore);
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17 sys::Path getGcc() {
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18 const char *cc = NULL;
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19
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20 if (gcc.getNumOccurrences() > 0 && gcc.length() > 0)
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21 cc = gcc.c_str();
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22
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23 if (!cc)
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24 cc = getenv("CC");
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25 if (!cc)
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26 cc = "gcc";
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28 sys::Path path = sys::Program::FindProgramByName(cc);
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29 if (path.empty() && !cc) {
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30 if (cc) {
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31 path.set(cc);
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32 } else {
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33 error("failed to locate gcc");
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34 fatal();
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35 }
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36 }
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38 return path;
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39 }