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Global const unions with @(rodata)

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gingerBill
2025-09-28 20:40:26 +01:00
parent ffdfbfe2c2
commit 17204bd1c2
3 changed files with 71 additions and 55 deletions
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77
src/llvm_backend.cpp
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@@ -3262,37 +3262,14 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
lbModule *m = &gen->default_module;
String name = lb_get_entity_name(m, e);
lbValue g = {};
g.value = LLVMAddGlobal(m->mod, lb_type(m, e->type), alloc_cstring(permanent_allocator(), name));
g.type = alloc_type_pointer(e->type);
lb_apply_thread_local_model(g.value, e->Variable.thread_local_model);
if (is_foreign) {
LLVMSetLinkage(g.value, LLVMExternalLinkage);
LLVMSetDLLStorageClass(g.value, LLVMDLLImportStorageClass);
LLVMSetExternallyInitialized(g.value, true);
lb_add_foreign_library_path(m, e->Variable.foreign_library);
} else {
LLVMSetInitializer(g.value, LLVMConstNull(lb_type(m, e->type)));
}
if (is_export) {
LLVMSetLinkage(g.value, LLVMDLLExportLinkage);
LLVMSetDLLStorageClass(g.value, LLVMDLLExportStorageClass);
} else if (!is_foreign) {
LLVMSetLinkage(g.value, USE_SEPARATE_MODULES ? LLVMWeakAnyLinkage : LLVMInternalLinkage);
}
lb_set_linkage_from_entity_flags(m, g.value, e->flags);
LLVMSetAlignment(g.value, cast(u32)type_align_of(e->type));
if (e->Variable.link_section.len > 0) {
LLVMSetSection(g.value, alloc_cstring(permanent_allocator(), e->Variable.link_section));
}
lbGlobalVariable var = {};
var.var = g;
var.decl = decl;
lbValue g = {};
g.type = alloc_type_pointer(e->type);
g.value = LLVMAddGlobal(m->mod, lb_type(m, e->type), alloc_cstring(permanent_allocator(), name));
if (decl->init_expr != nullptr) {
TypeAndValue tav = type_and_value_of_expr(decl->init_expr);
if (!is_type_any(e->type) && !is_type_union(e->type)) {
@@ -3305,6 +3282,11 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
ExactValue v = tav.value;
lbValue init = lb_const_value(m, tav.type, v, cc);
LLVMDeleteGlobal(g.value);
g.value = nullptr;
g.value = LLVMAddGlobal(m->mod, LLVMTypeOf(init.value), alloc_cstring(permanent_allocator(), name));
LLVMSetInitializer(g.value, init.value);
var.is_initialized = true;
if (cc.is_rodata) {
@@ -3323,16 +3305,33 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
LLVMSetGlobalConstant(g.value, true);
}
lb_apply_thread_local_model(g.value, e->Variable.thread_local_model);
if (is_foreign) {
LLVMSetLinkage(g.value, LLVMExternalLinkage);
LLVMSetDLLStorageClass(g.value, LLVMDLLImportStorageClass);
LLVMSetExternallyInitialized(g.value, true);
lb_add_foreign_library_path(m, e->Variable.foreign_library);
} else if (!var.is_initialized) {
LLVMSetInitializer(g.value, LLVMConstNull(lb_type(m, e->type)));
}
if (is_export) {
LLVMSetLinkage(g.value, LLVMDLLExportLinkage);
LLVMSetDLLStorageClass(g.value, LLVMDLLExportStorageClass);
} else if (!is_foreign) {
LLVMSetLinkage(g.value, USE_SEPARATE_MODULES ? LLVMWeakAnyLinkage : LLVMInternalLinkage);
}
lb_set_linkage_from_entity_flags(m, g.value, e->flags);
LLVMSetAlignment(g.value, cast(u32)type_align_of(e->type));
if (e->Variable.link_section.len > 0) {
LLVMSetSection(g.value, alloc_cstring(permanent_allocator(), e->Variable.link_section));
}
if (e->flags & EntityFlag_Require) {
lb_append_to_compiler_used(m, g.value);
}
array_add(&global_variables, var);
lb_add_entity(m, e, g);
lb_add_member(m, name, g);
if (m->debug_builder) {
String global_name = e->token.string;
if (global_name.len != 0 && global_name != "_") {
@@ -3361,6 +3360,16 @@ gb_internal bool lb_generate_code(lbGenerator *gen) {
LLVMGlobalSetMetadata(g.value, 0, global_variable_metadata);
}
}
g.value = LLVMConstPointerCast(g.value, lb_type(m, alloc_type_pointer(e->type)));
var.var = g;
array_add(&global_variables, var);
lb_add_entity(m, e, g);
lb_add_member(m, name, g);
}
if (build_context.ODIN_DEBUG) {