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packed structs support comptime bitcasting

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* `type_size_store` is no longer a thing. loading and storing a pointer
   to a value may dereference up to `@sizeOf(T)` bytes, even for
   integers such as `u24`.
 * fix `types_have_same_zig_comptime_repr` to not think that the
   same `ZigTypeId` means the `ConstExprValue` neccesarily has the
   same representation.
 * implement `buf_write_value_bytes` and `buf_read_value_bytes` for
   `ContainerLayoutPacked`

closes #1120
This commit is contained in:
Andrew Kelley
2019-02-20 22:40:41 -05:00
parent 079728752e
commit 3ee9d06cbd
8 changed files with 226 additions and 40 deletions
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5
src/codegen.cpp
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@@ -3070,7 +3070,10 @@ static LLVMValueRef ir_render_bit_cast(CodeGen *g, IrExecutable *executable,
{
ZigType *wanted_type = instruction->base.value.type;
LLVMValueRef value = ir_llvm_value(g, instruction->value);
return LLVMBuildBitCast(g->builder, value, wanted_type->type_ref, "");
// We either bitcast the value directly or bitcast the pointer which does a pointer cast
LLVMTypeRef wanted_type_ref = handle_is_ptr(wanted_type) ?
LLVMPointerType(wanted_type->type_ref, 0) : wanted_type->type_ref;
return LLVMBuildBitCast(g->builder, value, wanted_type_ref, "");
}
static LLVMValueRef ir_render_widen_or_shorten(CodeGen *g, IrExecutable *executable,