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optimization: avoid codegening unused functions

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This commit is contained in:
Andrew Kelley
2016-02-01 02:34:01 -07:00
parent 179443bd61
commit 108af28c1b
3 changed files with 40 additions and 0 deletions
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32
src/codegen.cpp
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@@ -2582,9 +2582,28 @@ static void gen_const_globals(CodeGen *g) {
}
}
static void delete_unused_builtin_fns(CodeGen *g) {
auto it = g->builtin_fn_table.entry_iterator();
for (;;) {
auto *entry = it.next();
if (!entry)
break;
BuiltinFnEntry *builtin_fn = entry->value;
if (builtin_fn->ref_count == 0 &&
builtin_fn->fn_val)
{
LLVMDeleteFunction(entry->value->fn_val);
}
}
}
static void do_code_gen(CodeGen *g) {
assert(!g->errors.length);
delete_unused_builtin_fns(g);
gen_const_globals(g);
// Generate module level variables
@@ -2633,6 +2652,12 @@ static void do_code_gen(CodeGen *g) {
// Generate function prototypes
for (int fn_proto_i = 0; fn_proto_i < g->fn_protos.length; fn_proto_i += 1) {
FnTableEntry *fn_table_entry = g->fn_protos.at(fn_proto_i);
if (fn_table_entry->ref_count == 0) {
// huge time saver
LLVMDeleteFunction(fn_table_entry->fn_value);
continue;
}
AstNode *proto_node = fn_table_entry->proto_node;
assert(proto_node->type == NodeTypeFnProto);
AstNodeFnProto *fn_proto = &proto_node->data.fn_proto;
@@ -2681,6 +2706,11 @@ static void do_code_gen(CodeGen *g) {
// Generate function definitions.
for (int fn_i = 0; fn_i < g->fn_defs.length; fn_i += 1) {
FnTableEntry *fn_table_entry = g->fn_defs.at(fn_i);
if (fn_table_entry->ref_count == 0) {
// huge time saver
continue;
}
ImportTableEntry *import = fn_table_entry->import_entry;
AstNode *fn_def_node = fn_table_entry->fn_def_node;
LLVMValueRef fn = fn_table_entry->fn_value;
@@ -3064,6 +3094,7 @@ static void define_builtin_fns(CodeGen *g) {
builtin_fn->param_types[0] = nullptr; // manually checked later
builtin_fn->param_types[1] = nullptr; // manually checked later
builtin_fn->param_types[2] = g->builtin_types.entry_isize;
builtin_fn->ref_count = 1;
LLVMTypeRef param_types[] = {
LLVMPointerType(LLVMInt8Type(), 0),
@@ -3087,6 +3118,7 @@ static void define_builtin_fns(CodeGen *g) {
builtin_fn->param_types[0] = nullptr; // manually checked later
builtin_fn->param_types[1] = g->builtin_types.entry_u8;
builtin_fn->param_types[2] = g->builtin_types.entry_isize;
builtin_fn->ref_count = 1;
LLVMTypeRef param_types[] = {
LLVMPointerType(LLVMInt8Type(), 0),