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Edward R. Gonzalez
2025-06-01 01:36:59 -04:00
parent 93a71dc702
commit 798312dbaf
2 changed files with 74 additions and 71 deletions
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143
C/watl.v0.msvc.c
View File

@@ -40,6 +40,8 @@ enum {
#define stringify(S) stringify_impl(S) #define stringify(S) stringify_impl(S)
#define tmpl(prefix, type) prefix ## _ ## type #define tmpl(prefix, type) prefix ## _ ## type
#define alignas _Alignas
#define alignof _Alignof
#define byte_pad(amount, ...) Byte glue(_PAD_, __VA_ARGS__) [amount] #define byte_pad(amount, ...) Byte glue(_PAD_, __VA_ARGS__) [amount]
#define farray_len(array) (SSIZE)sizeof(array) / size_of( typeof((array)[0])) #define farray_len(array) (SSIZE)sizeof(array) / size_of( typeof((array)[0]))
#define farray_init(type, ...) (type[]){__VA_ARGS__} #define farray_init(type, ...) (type[]){__VA_ARGS__}
@@ -251,10 +253,20 @@ typedef def_struct(AllocatorInfo) {
void* data; void* data;
}; };
static_assert(size_of(AllocatorSP) <= size_of(Slice_Byte)); static_assert(size_of(AllocatorSP) <= size_of(Slice_Byte));
typedef def_struct(AllocatorQueryInfo) {
AllocatorSP save_point;
AllocatorQueryFlags features;
SSIZE left; // Contiguous memory left
SSIZE max_alloc;
SSIZE min_alloc;
B32 continuity_break; // Whether this allocation broke continuity with the previous (address space wise)
byte_pad(4);
};
static_assert(size_of(AllocatorProc_Out) == size_of(AllocatorQueryInfo));
#define MEMORY_ALIGNMENT_DEFAULT (2 * size_of(void*)) #define MEMORY_ALIGNMENT_DEFAULT (2 * size_of(void*))
AllocatorQueryFlags allocator_query(AllocatorInfo ainfo); AllocatorQueryInfo allocator_query(AllocatorInfo ainfo);
void mem_free (AllocatorInfo ainfo, Slice_Byte mem); void mem_free (AllocatorInfo ainfo, Slice_Byte mem);
void mem_reset (AllocatorInfo ainfo); void mem_reset (AllocatorInfo ainfo);
@@ -358,7 +370,7 @@ void varena_reset (VArena* arena);
AllocatorSP varena_save (VArena* arena); AllocatorSP varena_save (VArena* arena);
void varena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out); void varena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out);
#define ainfo_varena(varena) (AllocatorInfo) { .proc = varena_allocator_proc, .data = varena } #define ainfo_varena(varena) (AllocatorInfo) { .proc = & varena_allocator_proc, .data = varena }
#define varena_push(arena, type, ...) \ #define varena_push(arena, type, ...) \
cast(type*, varena__push(arena, 1, size_of(type), opt_args(Opts_varena, lit(stringify(type)), __VA_ARGS__) ).ptr) cast(type*, varena__push(arena, 1, size_of(type), opt_args(Opts_varena, lit(stringify(type)), __VA_ARGS__) ).ptr)
@@ -391,7 +403,7 @@ void arena_rewind (Arena* arena, AllocatorSP save_point);
AllocatorSP arena_save (Arena* arena); AllocatorSP arena_save (Arena* arena);
void arena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out); void arena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out);
#define ainfo_arena(arena) (AllocatorInfo){ .proc = arena_allocator_proc, .data = arena } #define ainfo_arena(arena) (AllocatorInfo){ .proc = & arena_allocator_proc, .data = arena }
#define arena_make(...) arena__make(opt_args(Opts_arena_make, __VA_ARGS__)) #define arena_make(...) arena__make(opt_args(Opts_arena_make, __VA_ARGS__))
@@ -607,9 +619,11 @@ typedef def_enum(U32, WATL_TokKind) {
WATL_Tok_LineFeed = '\n', WATL_Tok_LineFeed = '\n',
WATL_Tok_Text = 0xFFFFFFFF, WATL_Tok_Text = 0xFFFFFFFF,
}; };
typedef def_struct(WATL_Tok) { typedef Str8 WATL_Tok;
UTF8* code; // typedef def_struct(WATL_Tok) {
}; // UTF8* code;
// byte_pad(8);
// };
typedef def_Slice(WATL_Tok); typedef def_Slice(WATL_Tok);
typedef def_enum(U32, WATL_LexStatus) { typedef def_enum(U32, WATL_LexStatus) {
WATL_LexStatus_MemFail_SliceConstraintFail = (1 << 0), WATL_LexStatus_MemFail_SliceConstraintFail = (1 << 0),
@@ -732,9 +746,10 @@ void slice__copy(Slice_Byte dest, SSIZE dest_typewidth, Slice_Byte src, SSIZE sr
#pragma region Allocator Interface #pragma region Allocator Interface
inline inline
AllocatorQueryFlags allocator_query(AllocatorInfo ainfo) { AllocatorQueryInfo allocator_query(AllocatorInfo ainfo) {
assert(ainfo.proc != nullptr); assert(ainfo.proc != nullptr);
AllocatorProc_Out out; ainfo.proc((AllocatorProc_In){ .data = ainfo.data, .op = AllocatorOp_Query}, & out); return out.features; AllocatorQueryInfo out; ainfo.proc((AllocatorProc_In){ .data = ainfo.data, .op = AllocatorOp_Query}, (AllocatorProc_Out*)& out);
return out;
} }
inline inline
@@ -994,17 +1009,20 @@ void os_init(void) {
OS_SystemInfo* info = & os__windows_info.system_info; OS_SystemInfo* info = & os__windows_info.system_info;
info->target_page_size = (SSIZE)GetLargePageMinimum(); info->target_page_size = (SSIZE)GetLargePageMinimum();
} }
// TODO(Ed): Large pages disabled for now...
inline Byte* os__vmem_reserve(SSIZE size, Opts_vmem* opts) { inline Byte* os__vmem_reserve(SSIZE size, Opts_vmem* opts) {
assert(opts != nullptr); assert(opts != nullptr);
void* result = VirtualAlloc(cast(void*, opts->base_addr), size void* result = VirtualAlloc(cast(void*, opts->base_addr), size
, MS_MEM_RESERVE|MS_MEM_COMMIT|(opts->no_large_pages == false ? MS_MEM_LARGE_PAGES : 0) , MS_MEM_RESERVE|MS_MEM_COMMIT
// |(opts->no_large_pages == false ? MS_MEM_LARGE_PAGES : 0)
, MS_PAGE_READWRITE , MS_PAGE_READWRITE
); );
return result; return result;
} }
inline B32 os__vmem_commit(void* vm, SSIZE size, Opts_vmem* opts) { inline B32 os__vmem_commit(void* vm, SSIZE size, Opts_vmem* opts) {
assert(opts != nullptr); assert(opts != nullptr);
if (opts->no_large_pages == false ) { return 1; } // if (opts->no_large_pages == false ) { return 1; }
B32 result = (VirtualAlloc(vm, size, MS_MEM_COMMIT, MS_PAGE_READWRITE) != 0); B32 result = (VirtualAlloc(vm, size, MS_MEM_COMMIT, MS_PAGE_READWRITE) != 0);
return result; return result;
} }
@@ -1029,7 +1047,7 @@ VArena* varena__make(Opts_varena_make* opts) {
.reserve = reserve_size, .reserve = reserve_size,
.commit_size = commit_size, .commit_size = commit_size,
.committed = commit_size, .committed = commit_size,
.commit_used = 0, .commit_used = header_size,
.flags = opts->flags .flags = opts->flags
}; };
return vm; return vm;
@@ -1041,9 +1059,8 @@ Slice_Byte varena__push(VArena* vm, SSIZE amount, SSIZE type_width, Opts_varena*
SSIZE aligned_size = align_pow2(requested_size, alignment); SSIZE aligned_size = align_pow2(requested_size, alignment);
SSIZE current_offset = vm->reserve_start + vm->commit_used; SSIZE current_offset = vm->reserve_start + vm->commit_used;
SSIZE to_be_used = vm->commit_used + aligned_size; SSIZE to_be_used = vm->commit_used + aligned_size;
SSIZE reserve_left = vm->reserve - current_offset; SSIZE reserve_left = vm->reserve - vm->commit_used;
SSIZE header_offset = vm->reserve_start - cast(SSIZE, vm); SSIZE commit_left = vm->committed - vm->commit_used;
SSIZE commit_left = vm->committed - vm->commit_used - header_offset;
B32 exhausted = commit_left < to_be_used; B32 exhausted = commit_left < to_be_used;
assert(to_be_used < reserve_left); assert(to_be_used < reserve_left);
if (exhausted) if (exhausted)
@@ -1166,7 +1183,7 @@ Slice_Byte arena__push(Arena* arena, SSIZE amount, SSIZE type_width, Opts_arena*
SSIZE alignment = opts->alignment ? opts->alignment : MEMORY_ALIGNMENT_DEFAULT; SSIZE alignment = opts->alignment ? opts->alignment : MEMORY_ALIGNMENT_DEFAULT;
SSIZE size_aligned = align_pow2(size_requested, alignment); SSIZE size_aligned = align_pow2(size_requested, alignment);
SSIZE pos_pre = active->pos; SSIZE pos_pre = active->pos;
SSIZE pos_pst = pos_pre + size_requested; SSIZE pos_pst = pos_pre + size_aligned;
B32 should_chain = B32 should_chain =
((arena->flags & ArenaFlag_NoChain) == 0) ((arena->flags & ArenaFlag_NoChain) == 0)
&& active->backing->reserve < pos_pst; && active->backing->reserve < pos_pst;
@@ -1182,9 +1199,10 @@ Slice_Byte arena__push(Arena* arena, SSIZE amount, SSIZE type_width, Opts_arena*
sll_stack_push_n(arena->current, new_arena, prev); sll_stack_push_n(arena->current, new_arena, prev);
active = arena->current; active = arena->current;
} }
Byte* result = cast(Byte*, active) + pos_pre;
Slice_Byte vresult = varena_push_array(active->backing, Byte, size_aligned, .alignment = alignment); Slice_Byte vresult = varena_push_array(active->backing, Byte, size_aligned, .alignment = alignment);
slice_assert(vresult); slice_assert(vresult);
assert(cast(Byte*, pos_pst) == vresult.ptr); assert(result == vresult.ptr);
active->pos = pos_pst; active->pos = pos_pst;
return vresult; return vresult;
} }
@@ -1215,7 +1233,7 @@ void arena_rewind(Arena* arena, AllocatorSP save_point) {
curr->pos = new_pos; curr->pos = new_pos;
varena_rewind(curr->backing, (AllocatorSP){varena_allocator_proc, curr->pos}); varena_rewind(curr->backing, (AllocatorSP){varena_allocator_proc, curr->pos});
} }
inline AllocatorSP arena_save(Arena* arena) { return (AllocatorSP){arena_allocator_proc, arena->current->pos}; }; inline AllocatorSP arena_save(Arena* arena) { return (AllocatorSP){arena_allocator_proc, arena->base_pos + arena->current->pos}; };
void arena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out) void arena_allocator_proc(AllocatorProc_In in, AllocatorProc_Out* out)
{ {
assert(out != nullptr); assert(out != nullptr);
@@ -1484,7 +1502,7 @@ Str8 str8__fmt_kt1l(AllocatorInfo ainfo, Slice_Byte buffer, KT1L_Str8 table, Str
slice_assert(buffer); slice_assert(buffer);
slice_assert(table); slice_assert(table);
slice_assert(fmt_template); slice_assert(fmt_template);
assert(ainfo.proc != nullptr ? (allocator_query(ainfo) & AllocatorQuery_Grow) != 0 : true); assert(ainfo.proc != nullptr ? (allocator_query(ainfo).features & AllocatorQuery_Grow) != 0 : true);
UTF8* cursor_buffer = buffer.ptr; UTF8* cursor_buffer = buffer.ptr;
SSIZE buffer_remaining = buffer.len; SSIZE buffer_remaining = buffer.len;
@@ -1646,13 +1664,13 @@ Str8 str8cache_set(KT1CX_Str8 kt, U64 key, Str8 value, AllocatorInfo str_reserve
.type_name = lit(stringify(Str8)) .type_name = lit(stringify(Str8))
}); });
slice_assert(entry); slice_assert(entry);
Str8 result = { entry.ptr, 0 }; Str8* result = pcast(Str8*, entry.ptr);
B32 is_empty = (result.ptr == nullptr) && (result.len == 0); B32 is_empty = (result->len == 0);
if (is_empty) { if (is_empty) {
result = alloc_slice(str_reserve, UTF8, value.len); * result = alloc_slice(str_reserve, UTF8, value.len);
slice_copy(result, value); slice_copy(* result, value);
} }
return result; return * result;
} }
inline inline
Str8 cache_str8(Str8Cache* cache, Str8 str) { Str8 cache_str8(Str8Cache* cache, Str8 str) {
@@ -1733,8 +1751,8 @@ __declspec(dllimport) MS_DWORD __stdcall GetLastError(void);
inline inline
FileOpInfo file__read_contents(Str8 path, Opts_read_file_contents* opts) { FileOpInfo file__read_contents(Str8 path, Opts_read_file_contents* opts) {
slice_assert(path); slice_assert(path);
assert(opts != nullptr); assert(opts != nullptr);
FileOpInfo result; api_file_read_contents(& result, path, * opts); FileOpInfo result = {0}; api_file_read_contents(& result, path, * opts);
return result; return result;
} }
void api_file_read_contents(FileOpInfo* result, Str8 path, Opts_read_file_contents opts) void api_file_read_contents(FileOpInfo* result, Str8 path, Opts_read_file_contents opts)
@@ -1893,67 +1911,69 @@ void api_watl_lex(WATL_LexInfo* info, Str8 source, Opts_watl_lex* opts)
assert(opts != nullptr); assert(opts != nullptr);
assert(opts->ainfo_msgs.proc != nullptr); assert(opts->ainfo_msgs.proc != nullptr);
assert(opts->ainfo_toks.proc != nullptr); assert(opts->ainfo_toks.proc != nullptr);
AllocatorProc_Out start_snapshot; { opts->ainfo_toks.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & start_snapshot); } AllocatorQueryInfo start_snapshot = allocator_query(opts->ainfo_toks);
WATL_LexMsg* msg_last = nullptr; WATL_LexMsg* msg_last = nullptr;
UTF8* end = source.ptr + source.len; UTF8* end = source.ptr + source.len;
UTF8* cursor = source.ptr; UTF8* cursor = source.ptr;
UTF8* prev = source.ptr - 1; UTF8* prev = cursor - 1;
UTF8 code = * cursor; UTF8 code = * cursor;
B32 was_formatting = true; B32 was_formatting = true;
WATL_Tok* tok = nullptr; WATL_Tok* tok = nullptr;
S32 num = 0; S32 num = 0;
for (; cursor < end;) for (; cursor < end;)
{ {
#define alloc_tok() alloc_type(opts->ainfo_toks, WATL_Tok, .alignment = alignof(WATL_Tok))
switch (code) switch (code)
{ {
case WATL_Tok_Space: case WATL_Tok_Space:
case WATL_Tok_Tab: case WATL_Tok_Tab:
{ {
if (* prev != * cursor) { if (* prev != * cursor) {
tok = alloc_type(opts->ainfo_toks, WATL_Tok); tok = alloc_tok();
tok->code = cursor; * tok = (WATL_Tok){ cursor, 0 };
was_formatting = true; was_formatting = true;
++ num; ++ num;
} }
cursor += 1; cursor += 1;
tok->len += 1;
} }
break; break;
case WATL_Tok_LineFeed: { case WATL_Tok_LineFeed: {
tok = alloc_type(opts->ainfo_toks, WATL_Tok); tok = alloc_tok();
tok->code = cursor; * tok = (WATL_Tok){ cursor, 1 };
cursor += 1; cursor += 1;
was_formatting = true; was_formatting = true;
++ num; ++ num;
} }
break; break;
// Assuming what comes after is line feed. // Assuming what comes after is line feed.
case WATL_Tok_CarriageReturn: { case WATL_Tok_CarriageReturn: {
tok = alloc_type(opts->ainfo_toks, WATL_Tok); tok = alloc_tok();
tok->code = cursor; * tok = (WATL_Tok){ cursor, 2 };
cursor += 2; cursor += 2;
was_formatting = true; was_formatting = true;
++ num; ++ num;
} }
break; break;
default: default:
{ {
if (was_formatting) { if (was_formatting) {
tok = alloc_type(opts->ainfo_toks, WATL_Tok); tok = alloc_tok();
tok->code = cursor; * tok = (WATL_Tok){ cursor, 0 };
was_formatting = false; was_formatting = false;
++ num; ++ num;
} }
cursor += 1; cursor += 1;
tok->len += 1;
} }
break; break;
} }
prev = cursor - 1; prev = cursor - 1;
code = * cursor; code = * cursor;
#undef alloc_tok
} }
AllocatorProc_Out end_snapshot; { AllocatorQueryInfo end_snapshot = allocator_query(opts->ainfo_toks);
opts->ainfo_toks.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & end_snapshot);
}
SSIZE num_bytes = end_snapshot.save_point.slot - start_snapshot.save_point.slot; SSIZE num_bytes = end_snapshot.save_point.slot - start_snapshot.save_point.slot;
if (num_bytes > start_snapshot.left) { if (num_bytes > start_snapshot.left) {
info->signal |= WATL_LexStatus_MemFail_SliceConstraintFail; info->signal |= WATL_LexStatus_MemFail_SliceConstraintFail;
@@ -1967,26 +1987,11 @@ void api_watl_lex(WATL_LexInfo* info, Str8 source, Opts_watl_lex* opts)
} }
assert(tok != nullptr); assert(tok != nullptr);
assert(num > 0); assert(num > 0);
info->toks.ptr = tok - num; info->toks.ptr = tok - num + 1;
info->toks.len = num; info->toks.len = num;
} }
WATL_LexInfo watl__lex(Str8 source, Opts_watl_lex* opts) { WATL_LexInfo info = {0}; api_watl_lex(& info, source, opts); return info; } WATL_LexInfo watl__lex(Str8 source, Opts_watl_lex* opts) { WATL_LexInfo info = {0}; api_watl_lex(& info, source, opts); return info; }
Str8 str8_from_watl_tok(Slice_WATL_Tok toks, WATL_Tok* tok) {
SSIZE start = cast(SSIZE, toks.ptr->code);
SSIZE curr = cast(SSIZE, tok->code);
SSIZE offset = curr - start;
SSIZE left = cast(SSIZE, toks.ptr + toks.len) - offset;
B32 last_tok = tok == & toks.ptr[toks.len - 1]; // Check to see if this token's end is also the end of the slice:
Str8 text = {0};
text.ptr = tok->code;
text.len = last_tok ?
left
// Othwerise its the next minus the curr.
: cast(SSIZE, (tok + 1)->code - tok->code);
return text;
}
void api_watl_parse(WATL_ParseInfo* info, Slice_WATL_Tok tokens, Opts_watl_parse* opts) void api_watl_parse(WATL_ParseInfo* info, Slice_WATL_Tok tokens, Opts_watl_parse* opts)
{ {
if (tokens.len == 0) { return; } if (tokens.len == 0) { return; }
@@ -1995,8 +2000,8 @@ void api_watl_parse(WATL_ParseInfo* info, Slice_WATL_Tok tokens, Opts_watl_parse
assert(opts->ainfo_msgs.proc != nullptr); assert(opts->ainfo_msgs.proc != nullptr);
assert(opts->ainfo_nodes.proc != nullptr); assert(opts->ainfo_nodes.proc != nullptr);
assert(opts->str_cache != nullptr); assert(opts->str_cache != nullptr);
AllocatorProc_Out start_lines_snapshot; { opts->ainfo_lines.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & start_lines_snapshot); } AllocatorQueryInfo start_lines_snapshot = allocator_query(opts->ainfo_lines);
AllocatorProc_Out start_nodes_snapshot; { opts->ainfo_nodes.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & start_nodes_snapshot); } AllocatorQueryInfo start_nodes_snapshot = allocator_query(opts->ainfo_nodes);
WATL_ParseMsg* msg_last = nullptr; WATL_ParseMsg* msg_last = nullptr;
WATL_Line* line = alloc_type(opts->ainfo_lines, WATL_Line); WATL_Line* line = alloc_type(opts->ainfo_lines, WATL_Line);
@@ -2006,12 +2011,12 @@ void api_watl_parse(WATL_ParseInfo* info, Slice_WATL_Tok tokens, Opts_watl_parse
info->lines = (Slice_WATL_Line){ line, 0 }; info->lines = (Slice_WATL_Line){ line, 0 };
for (slice_iter(tokens, token)) for (slice_iter(tokens, token))
{ {
switch(* token->code) switch(* token->ptr)
{ {
case WATL_Tok_CarriageReturn: case WATL_Tok_CarriageReturn:
case WATL_Tok_LineFeed: case WATL_Tok_LineFeed:
{ {
AllocatorProc_Out end_nodes_snapshot; { opts->ainfo_nodes.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & end_nodes_snapshot); } AllocatorQueryInfo end_nodes_snapshot = allocator_query(opts->ainfo_nodes);
SSIZE distance_nodes = end_nodes_snapshot.save_point.slot - start_nodes_snapshot.save_point.slot; SSIZE distance_nodes = end_nodes_snapshot.save_point.slot - start_nodes_snapshot.save_point.slot;
if (distance_nodes > start_lines_snapshot.left) { if (distance_nodes > start_lines_snapshot.left) {
info->signal |= WATL_ParseStatus_MemFail_SliceConstraintFail; info->signal |= WATL_ParseStatus_MemFail_SliceConstraintFail;
@@ -2023,7 +2028,6 @@ void api_watl_parse(WATL_ParseInfo* info, Slice_WATL_Tok tokens, Opts_watl_parse
sll_queue_push_n(info->msgs, msg_last, msg, next); sll_queue_push_n(info->msgs, msg_last, msg, next);
assert(opts->failon_slice_constraint_fail == false); assert(opts->failon_slice_constraint_fail == false);
} }
opts->ainfo_nodes.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & start_nodes_snapshot);
WATL_Line* new_line = alloc_type(opts->ainfo_lines, WATL_Line); WATL_Line* new_line = alloc_type(opts->ainfo_lines, WATL_Line);
line = new_line; line = new_line;
line->ptr = curr; line->ptr = curr;
@@ -2035,14 +2039,13 @@ void api_watl_parse(WATL_ParseInfo* info, Slice_WATL_Tok tokens, Opts_watl_parse
default: default:
break; break;
} }
Str8 tok_str = str8_from_watl_tok(tokens, token); * curr = cache_str8(opts->str_cache, * token);
* curr = cache_str8(opts->str_cache, tok_str);
curr = alloc_type(opts->ainfo_nodes, WATL_Node); curr = alloc_type(opts->ainfo_nodes, WATL_Node);
* curr = (WATL_Node){0}; * curr = (WATL_Node){0};
line->len += 1; line->len += 1;
continue; continue;
} }
AllocatorProc_Out end_lines_snapshot; { opts->ainfo_lines.proc((AllocatorProc_In){.op = AllocatorOp_Query}, & end_lines_snapshot); } AllocatorQueryInfo end_lines_snapshot = allocator_query(opts->ainfo_lines);
SSIZE distance_lines = end_lines_snapshot.save_point.slot - start_lines_snapshot.save_point.slot; SSIZE distance_lines = end_lines_snapshot.save_point.slot - start_lines_snapshot.save_point.slot;
if (distance_lines > start_lines_snapshot.left) { if (distance_lines > start_lines_snapshot.left) {

2
scripts/build.ps1
View File

@@ -83,7 +83,7 @@ $compiler_args += $flag_c11
$compiler_args += $flag_exceptions_disabled $compiler_args += $flag_exceptions_disabled
$compiler_args += $flag_RTTI_disabled $compiler_args += $flag_RTTI_disabled
$compiler_args += $flag_preprocess_conform $compiler_args += $flag_preprocess_conform
$compiler_args += $flag_sanitize_address # $compiler_args += $flag_sanitize_address
$compiler_args += $flag_wall $compiler_args += $flag_wall