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Add --print-large-functions for checking which functions likely dominate the compile time.

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This commit is contained in:
Christoffer Lerno
2026-02-16 00:13:19 +01:00
parent d7cf8fa9ab
commit a7309b217e
9 changed files with 30 additions and 5 deletions
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2
src/build/build.h
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@@ -210,6 +210,7 @@ typedef struct BuildOptions_
bool test_nosort;
bool test_noleak;
bool test_show_output;
bool print_large_functions;
const char *custom_linker_path;
uint32_t symtab_size;
unsigned version;
@@ -416,6 +417,7 @@ typedef struct
bool old_enums;
bool old_compact_eq;
bool single_threaded;
bool print_large_functions;
int build_threads;
TrustLevel trust_level;
OptimizationSetting optsetting;

6
src/build/build_options.c
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@@ -140,6 +140,7 @@ static void usage(bool full)
print_opt("--use-old-slice-copy", "Use the old slice copy semantics.");
print_opt("--use-old-enums", "Use the old enum syntax and semantics.");
print_opt("--use-old-compact-eq", "Enable the old ability to use '@compact' to make a struct comparable.");
print_opt("--print-large-functions", "Print functions with large compile size.");
print_opt("--warn-deadcode=<yes|no|error>", "Print warning on dead-code: yes, no, error.");
print_opt("--warn-methodsnotresolved=<yes|no|error>", "Print warning on methods not resolved when accessed: yes, no, error.");
print_opt("--warn-deprecation=<yes|no|error>", "Print warning when using deprecated code and constructs: yes, no, error.");
@@ -895,6 +896,11 @@ static void parse_option(BuildOptions *options)
options->test_nosort = true;
return;
}
if (match_longopt("print-large-functions"))
{
options->print_large_functions = true;
return;
}
if ((argopt = match_argopt("warn-deadcode")))
{
options->warnings.dead_code = parse_opt_select(WarningLevel, argopt, warnings);

2
src/build/builder.c
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@@ -429,6 +429,8 @@ static void update_build_target_from_options(BuildTarget *target, BuildOptions *
target->old_slice_copy = options->old_slice_copy;
target->old_enums = options->old_enums;
target->old_compact_eq = options->old_compact_eq;
target->print_large_functions = options->print_large_functions;
// Remove feature flags
FOREACH(const char *, remove_feature, options->removed_feature_names)
{

10
src/compiler/llvm_codegen_function.c
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@@ -609,7 +609,15 @@ void llvm_emit_body(GenContext *c, LLVMValueRef function, FunctionPrototype *pro
c->debug.block_stack = NULL;
LLVMDIBuilderFinalizeSubprogram(c->debug.builder, c->debug.function);
}
if (compiler.build.print_large_functions)
{
unsigned instruction_count = LLVMGetFunctionInstructionCount(function);
if (instruction_count > 5000)
{
eprintf("%8u instructions found in %s:%s (%s) - function is very long.\n", instruction_count, decl->unit->module->name->module,
decl->name, decl->unit->file->full_path);
}
}
c->builder = prev_builder;
c->cur_func.ref = prev_function;
}

6
src/compiler/sema_internal.h
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@@ -51,14 +51,14 @@ const char *context_filename(SemaContext *context);
AstId context_get_defers(SemaContext *context, AstId defer_bottom, bool is_success);
void context_pop_defers(SemaContext *context, AstId *next);
void context_pop_defers_and_replace_ast(SemaContext *context, Ast *ast);
void context_change_scope_for_label(SemaContext *context, DeclId label, SourceSpan span);
void context_change_scope_for_label(SemaContext *context, DeclId label_id, SourceSpan span);
void context_change_scope_with_flags(SemaContext *context, ScopeFlags flags, SourceSpan span);
SemaContext *context_transform_for_eval(SemaContext *context, SemaContext *temp_context, CompilationUnit *eval_unit);
TokenType sema_splitpathref(const char *string, ArraySize len, Path **path_ref, const char **ident_ref);
void sema_print_inline(SemaContext *context, SourceSpan span_original);
void sema_print_inline(SemaContext *context, SourceSpan original);
void sema_error_at(SemaContext *context, SourceSpan span, const char *message, ...);
bool sema_warn_at(SemaContext *context, SourceSpan span, WarningLevel warning, const char *message, ...);
bool sema_warn_at(SemaContext *context, SourceSpan span, WarningLevel level, const char *message, ...);
void sema_context_init(SemaContext *context, CompilationUnit *unit);
void sema_context_destroy(SemaContext *context);