mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-10 15:22:04 +00:00
Encode function parameter alignment
The encoding is 3:5 giving 3 bits for alignment (log2) and 5 bits for size, with alignment in the 3 most significant bits. This keeps the format backwards compatible as until doubles were added, all types were aligned to 1 word which gets encoded as 0, and the size is unaffected.
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parent
1bc08c59f6
commit
7a399c956b
7 changed files with 91 additions and 7 deletions
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@ -423,6 +423,11 @@ typedef struct ddef_s {
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pr_int_t s_name;
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} ddef_t;
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typedef struct dparmsize_s {
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uint8_t size:5;
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uint8_t alignment:3;
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} dparmsize_t;
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#define DEF_SAVEGLOBAL (1<<15)
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#define MAX_PARMS 8
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@ -438,7 +443,7 @@ typedef struct dfunction_s {
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pr_int_t s_file; // source file defined in
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pr_int_t numparms;
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uint8_t parm_size[MAX_PARMS];
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dparmsize_t parm_size[MAX_PARMS];
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} dfunction_t;
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typedef union pr_type_u {
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@ -497,6 +497,8 @@ qfo_t *qfo_new (void);
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*/
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void qfo_delete (qfo_t *qfo);
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__attribute__((const)) int qfo_log2 (unsigned x);
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///@}
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#endif//__obj_file_h
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@ -53,7 +53,7 @@ qfcc_DEPENDENCIES= $(QFCC_DEPS)
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qfprogs_SOURCES= \
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disassemble.c dump_globals.c dump_lines.c dump_modules.c dump_strings.c \
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obj_file.c qfprogs.c strpool.c stub.c
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obj_file.c qfprogs.c strpool.c stub.c type.c
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qfprogs_LDADD= $(QFCC_LIBS)
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qfprogs_DEPENDENCIES= $(QFCC_DEPS)
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@ -217,7 +217,8 @@ dump_functions (progs_t *pr)
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else
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count = func->numparms;
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for (j = 0; j < count; j++)
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printf (" %d", func->parm_size[j]);
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printf (" %d:%d", func->parm_size[j].alignment,
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func->parm_size[j].size);
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printf (") %d @ %x", func->locals, func->parm_start);
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puts ("");
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if (pr->debug) {
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@ -665,7 +665,7 @@ get_def_type (qfo_t *qfo, pointer_t type)
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return ev_invalid;
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}
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static __attribute__((pure)) etype_t
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static __attribute__((pure)) int
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get_type_size (qfo_t *qfo, pointer_t type)
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{
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qfot_type_t *type_def;
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@ -701,6 +701,62 @@ get_type_size (qfo_t *qfo, pointer_t type)
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return 0;
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}
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int
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qfo_log2 (unsigned x)
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{
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int log2 = 0;
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while (x > 1) {
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x >>= 1;
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log2++;
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}
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return log2;
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}
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static __attribute__((pure)) int
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get_type_alignment_log (qfo_t *qfo, pointer_t type)
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{
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qfot_type_t *type_def;
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int i, alignment;
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if (type >= qfo->spaces[qfo_type_space].data_size)
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return 0;
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type_def = QFO_POINTER (qfo, qfo_type_space, qfot_type_t, type);
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switch ((ty_meta_e)type_def->meta) {
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case ty_none:
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// field, pointer and function types store their basic type in
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// the same location.
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return qfo_log2 (ev_types[type_def->t.type]->alignment);
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case ty_struct:
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case ty_union:
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for (i = alignment = 0; i < type_def->t.strct.num_fields; i++) {
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qfot_var_t *field = type_def->t.strct.fields + i;
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int a;
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a = get_type_alignment_log (qfo, field->type);
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if (a > alignment) {
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alignment = a;
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}
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}
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return alignment;
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case ty_enum:
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return qfo_log2 (ev_types[ev_integer]->alignment);
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case ty_array:
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return get_type_alignment_log (qfo, type_def->t.array.type);
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case ty_class:
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return 0; // FIXME
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}
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return 0;
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}
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static __attribute__((pure)) dparmsize_t
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get_parmsize (qfo_t *qfo, pointer_t type)
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{
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dparmsize_t parmsize = {
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get_type_size (qfo, type),
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get_type_alignment_log (qfo, type),
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};
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return parmsize;
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}
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static void
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function_params (qfo_t *qfo, qfo_func_t *func, dfunction_t *df)
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{
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@ -716,8 +772,9 @@ function_params (qfo_t *qfo, qfo_func_t *func, dfunction_t *df)
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df->numparms = num_params = type->t.func.num_params;
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if (num_params < 0)
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num_params = ~num_params;
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for (i = 0; i < num_params; i++)
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df->parm_size[i] = get_type_size (qfo, type->t.func.param_types[i]);
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for (i = 0; i < num_params; i++) {
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df->parm_size[i] = get_parmsize (qfo, type->t.func.param_types[i]);
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}
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}
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static void
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@ -418,8 +418,11 @@ finish_link (void)
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flags = (QFOD_GLOBAL | QFOD_CONSTANT | QFOD_INITIALIZED | QFOD_NOSAVE);
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if (options.code.progsversion != PROG_ID_VERSION) {
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pr_int_t param_size = type_size (&type_param);
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pr_int_t param_alignment = qfo_log2 (type_param.alignment);
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linker_add_def (".param_size", &type_integer, flags,
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¶m_size);
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linker_add_def (".param_alignment", &type_integer, flags,
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¶m_alignment);
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}
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if (options.code.debug) {
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@ -2,6 +2,8 @@
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# include "config.h"
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#endif
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#include <stdlib.h>
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#include "class.h"
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#include "codespace.h"
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#include "diagnostic.h"
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@ -12,9 +14,12 @@
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#include "expr.h"
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#include "function.h"
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#include "obj_file.h"
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#include "obj_type.h"
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#include "options.h"
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#include "qfcc.h"
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#include "strpool.h"
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#include "struct.h"
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#include "symtab.h"
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#include "type.h"
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#include "value.h"
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@ -23,11 +28,22 @@ options_t options;
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int num_linenos;
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pr_lineno_t *linenos;
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pr_info_t pr;
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type_t type_Class;
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type_t type_SEL;
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type_t type_id;
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__attribute__((const)) string_t ReuseString (const char *str) {return 0;}
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void encode_type (struct dstring_s *str, const type_t *type) {}
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__attribute__((const)) codespace_t *codespace_new (void) {return 0;}
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void codespace_addcode (codespace_t *codespace, struct dstatement_s *code, int size) {}
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__attribute__((const)) int function_parms (function_t *f, byte *parm_size) {return 0;}
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void def_to_ddef (def_t *def, ddef_t *ddef, int aux) {}
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__attribute__((noreturn)) void _internal_error (expr_t *e, const char *file, int line, const char *fmt, ...) {abort();}
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__attribute__((const)) expr_t *_warning (expr_t *e, const char *file, int line, const char *fmt, ...) {return 0;}
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__attribute__((const)) expr_t *_error (expr_t *e, const char *file, int line, const char *fmt, ...) {return 0;}
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__attribute__((const)) symbol_t *make_structure (const char *name, int su, struct_def_t *defs, type_t *type) {return 0;}
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__attribute__((const)) symbol_t *symtab_addsymbol (symtab_t *symtab, symbol_t *symbol) {return 0;}
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__attribute__((const)) symbol_t *new_symbol_type (const char *name, type_t *type) {return 0;}
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__attribute__((const)) def_t *qfo_encode_type (type_t *type) {return 0;}
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__attribute__((const)) int obj_types_assignable (const type_t *dst, const type_t *src) {return 0;}
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void print_protocollist (struct dstring_s *dstr, protocollist_t *protocollist) {}
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int obj_is_id (const type_t *type){return type->type;}
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int compare_protocols (protocollist_t *protos1, protocollist_t *protos2){return protos1->count - protos2->count;}
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