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view tools/binding/llvmsample3.d @ 1499:df11cdec45a2
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 | 1ba61de8796b |
children |
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// simple example that shows off getting D wrappers from C values. module llvmsample3; import llvm.c.Core; import llvm.llvm; void main() { auto m = new Module("sample3"); // global int32 auto gi = m.addGlobal(Type.Int32, "myint"); gi.initializer = ConstantInt.GetU(Type.Int32, 42); // this is not a cached value, it's recreated dynamically auto _i = gi.initializer; auto ci = cast(ConstantInt)_i; assert(ci !is null); ci.dump; // global struct auto st = StructType.Get([Type.Double,Type.Double,Type.Double]); auto gs = m.addGlobal(st, "mystruct"); auto elems = new Constant[3]; foreach(i,ref e; elems) e = ConstantReal.Get(Type.Double, i+1); gs.initializer = ConstantStruct.Get(elems); // again this is not a cached value. auto s = gs.initializer; auto cs = cast(ConstantStruct)s; assert(cs !is null); cs.dump; }