tcctok.h定义了C语言的词法分析的基本元素，主要定义了关键字。
/ keywords /
DEF(TOK_INT, "int")
DEF(TOK_VOID, "void")
DEF(TOK_CHAR, "char")
DEF(TOK_IF, "if")
DEF(TOK_ELSE, "else")
DEF(TOK_WHILE, "while")
DEF(TOK_BREAK, "break")
DEF(TOK_RETURN, "return")
DEF(TOK_FOR, "for")
DEF(TOK_EXTERN, "extern")
DEF(TOK_STATIC, "static")
DEF(TOK_UNSIGNED, "unsigned")
DEF(TOK_GOTO, "goto")
DEF(TOK_DO, "do")
DEF(TOK_CONTINUE, "continue")
DEF(TOK_SWITCH, "switch")
DEF(TOK_CASE, "case")
..............................
..............................
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同时定义了条件编译的相关内容
/*****/
/ the following are not keywords. They are included to ease parsing /
/ preprocessor only /
DEF(TOK_DEFINE, "define")
DEF(TOK_INCLUDE, "include")
DEF(TOK_INCLUDE_NEXT, "include_next")
DEF(TOK_IFDEF, "ifdef")
DEF(TOK_IFNDEF, "ifndef")
DEF(TOK_ELIF, "elif")
DEF(TOK_ENDIF, "endif")
DEF(TOK_DEFINED, "defined")
在i386-tok.h中定义了汇编的相关关键词
/ ------------------------------------------------------------------ /
/ WARNING: relative order of tokens is important. /
/ register /
DEF_ASM(al)
DEF_ASM(cl)
DEF_ASM(dl)
DEF_ASM(bl)
DEF_ASM(ah)
DEF_ASM(ch)
DEF_ASM(dh)
DEF_ASM(bh)
DEF_ASM(ax)
DEF_ASM(cx)
DEF_ASM(dx)
DEF_ASM(bx)
DEF_ASM(sp)
DEF_ASM(bp)
DEF_ASM(si)
DEF_ASM(di)
DEF_ASM(eax)
DEF_ASM(ecx)
DEF_ASM(edx)
DEF_ASM(ebx)
DEF_ASM(esp)
DEF_ASM(ebp)
DEF_ASM(esi)
DEF_ASM(edi)
#ifdef TCC_TARGET_X86_64
DEF_ASM(rax)
DEF_ASM(rcx)
DEF_ASM(rdx)
...........................
............................
在x86_64-asm.h中定义了64位汇编相关关键字
DEF_ASM_OP0(clc, 0xf8) / must be first OP0 /
DEF_ASM_OP0(cld, 0xfc)
DEF_ASM_OP0(cli, 0xfa)
DEF_ASM_OP0(clts, 0x0f06)
DEF_ASM_OP0(cmc, 0xf5)
DEF_ASM_OP0(lahf, 0x9f)
DEF_ASM_OP0(sahf, 0x9e)
DEF_ASM_OP0(pushfl, 0x9c)
DEF_ASM_OP0(popfl, 0x9d)
DEF_ASM_OP0(pushf, 0x9c)
DEF_ASM_OP0(popf, 0x9d)
DEF_ASM_OP0(stc, 0xf9)
DEF_ASM_OP0(std, 0xfd)
DEF_ASM_OP0(sti, 0xfb)
DEF_ASM_OP0(aaa, 0x37)
先从几个重要文件入手。
libtcc.c
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/
TCC - Tiny C Compiler
Copyright (c) 2001-2004 Fabrice Bellard
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tcc.h"
/****/
/ global variables /
使用GCC扩展还是TCC扩展
/ use GNU C extensions /
ST_DATA int gnu_ext = 1;
/ use TinyCC extensions /
ST_DATA int tcc_ext = 1;
ST_DATA 结构标注TCC状态。
/ XXX: get rid of this ASAP /
ST_DATA struct TCCState *tcc_state;
/****/
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根据标志包含一些相应TCC文件。
#ifdef ONE_SOURCE
#include "tccpp.c"
#include "tccgen.c"
#include "tccelf.c"
#include "tccrun.c"
#ifdef TCC_TARGET_I386
#include "i386-gen.c"
#endif
#ifdef TCC_TARGET_ARM
#include "arm-gen.c"
#endif
#ifdef TCC_TARGET_C67
#include "c67-gen.c"
#endif
#ifdef TCC_TARGET_X86_64
#include "x86_64-gen.c"
#endif
#ifdef CONFIG_TCC_ASM
#include "tccasm.c"
#if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
#include "i386-asm.c"
#endif
#endif
#ifdef TCC_TARGET_COFF
#include "tcccoff.c"
#endif
#ifdef TCC_TARGET_PE
#include "tccpe.c"
#endif
#endif / ONE_SOURCE /
CONFIG_TCC_ASM打开内联汇编的开关
/****/
#ifndef CONFIG_TCC_ASM
ST_FUNC void asm_instr(void)
{
tcc_error("inline asm() not supported");
}
ST_FUNC void asm_global_instr(void)
{
tcc_error("inline asm() not supported");
}
#endif
原文链接：http://blog.51cto.com/13959448/2324503