For the back-end SDCC uses a global register allocation scheme which should
be well suited for other 8 bit MCUs.
The peep hole optimizer uses a rule based substitution mechanism which
- is MCU independent.
+ is MCU dependent.
Supported data-types are
\emph on
short (8 bits, 1 byte), char (8 bits, 1 byte), int (16 bits, 2 bytes ),
In addition routines developed in assembly can also be called.
SDCC also provides an option to report the relative complexity of a function,
these functions can then be further optimized, or hand coded in assembly
- if need be.
+ if needed.
SDCC also comes with a companion source level debugger SDCDB, the debugger
currently uses ucSim a freeware simulator for 8051 and other micro-controllers.
The latest version can be downloaded from
Web links to other SDCC related sites can also be found here.
This document can be found in the DOC directory of the source package as
a text or HTML file.
- Some of the other tools(simulator and assembler) included with SDCC contain
+ Some of the other tools (simulator and assembler) included with SDCC contain
their own documentation and can be found in the source distribution.
If you want the latest unreleased software, the complete source package
is available directly by anonymous CVS on www.sourceforge.net.
If it doesn't run, or gives a message about not finding sdcc program, then
you need to check over your installation.
Make sure that the sdcc bin directory is in your executable search path
- defined by the PATH environment setting(see the Trouble-shooting section
+ defined by the PATH environment setting (see the Trouble-shooting section
for suggestions).
Make sure that the sdcc program is in the bin folder, if not perhaps something
did not install correctly.
.
If all goes well the compiler will link with the libraries and produce
a test.ihx output file.
- If this step fails(no test.ihx, and the linker generates warnings), then
- the problem is most likely that sdcc cannot find the usr/local/share/sdcc/lib
+ If this step fails
\series default
-/small
+
+\series medium
+(no test.ihx, and the linker generates warnings), then the problem is most
+ likely that sdcc cannot find the
+\series default
+/
+\series medium
+usr/local/share/sdcc/lib directory
+\series default
+
\series medium
- directory(see the Install trouble-shooting section for suggestions).
+(see the Install trouble-shooting section for suggestions).
\layout Standard
This should generate a test.ihx output file, and it should give no warnings
such as not finding the string.h file.
If it cannot find the string.h file, then the problem is that sdcc cannot
- find the /usr/local/share/sdcc/include directory(see the Install trouble-shooti
-ng section for suggestions).
+ find the /usr/local/share/sdcc/include directory
+\series default
+
+\series medium
+(see the Install trouble-shooting section for suggestions).
\layout Subsection
Install Trouble-shooting
SDCC does not compile correctly.
\layout Standard
-A few things to try include starting from scratch by unpacking the .tgz source
- package again in an empty directory.
- If this doesn't work, you could try downloading a different version.
- If this doesn't work, you can re-direct the install messages by doing the
- following:
+A things to try is starting from scratch by unpacking the .tgz source package
+ again in an empty directory.
+ Confure it again and build like:
\layout Standard
-$./make > dump.txt 2>&1
+
+\begin_inset Quotes eld
+\end_inset
+
+make 2&>1 | tee make.log
+\begin_inset Quotes erd
+\end_inset
+
+
\layout Standard
-After this you can examine the dump.txt files to locate the problem.
- Or these messages can be attached to an email that could be helpful when
- requesting help from the mailing list.
+After this you can review the make.log file to locate the problem.
+ Or a relevant part of this be attached to an email that could be helpful
+ when requesting help from the mailing list.
\layout Subsubsection
What the
\size footnotesize
-sourcefile.<ihx | s19> - The load module : ihx - Intel hex format (default
- ), s19 - Motorola S19 format when compiler option --out-fmt-s19 is used.
+sourcefile.ihx - The load module in Intel hex format (you can select the
+ Motorola S19 format with --out-fmt-s19)
\layout Subsubsection
Projects with Multiple Source Files
\emph default
in the directory
\emph on
-'mylib'
+'mylib
\emph default
-.
+' (if that is not the same as your current project).
\layout Standard
Generate code for the Toshiba TLCS-900H processor(In development, not complete).
\layout Subsubsection
-Path, Lib and Define Options
+Path and Define Options
\layout List
\labelwidthstring 00.00.0000
\series bold
\bar under
--I<path>
+-I<path>
\series default
\bar default
The additional location where the pre processor will look for <..h> or
\series bold
\size large
\bar under
--D<macro[=value]>
-\series default
+--lib-path(-L)
\size default
+
+\series default
\bar default
- Command line definition of macros.
- Passed to the pre processor.
+<absolute path to additional libraries> This option is passed to the linkage
+ editor, additional libraries search path.
+ The path name must be absolute.
+ Additional library files may be specified in the command line .
+ See section Compiling programs for more details
\layout List
\labelwidthstring 00.00.0000
\series bold
\size large
\bar under
---lib-path(-L)
-\size default
-
+-D<macro[=value]>
\series default
+\size default
\bar default
-<absolute path to additional libraries> This option is passed to the linkage
- editor, additional libraries search path.
- The path name must be absolute.
- Additional library files may be specified in the command line .
- See section Compiling programs for more details.
+ Command line definition of macros.
+ Passed to the pre processor.
\layout Subsubsection
MCS51 Options
\series bold
\size large
\bar under
---model-flat24
+--stack-auto
\series default
\emph on
\bar default
-\size default
-\emph default
-Generate code forDS80C390 24-bit flat mode.
- See section Memory Models for more details.
-\layout List
-\labelwidthstring 00.00.0000
-
-
-\series bold
-\size large
-\bar under
---stack-
-\emph on
-auto
-\series default
-\bar default
-
\size default
\emph default
All functions in the source file will be compiled as
\labelwidthstring 00.00.0000
+\size large
+\bar under
+--
+\series bold
+model
+\series default
+-
+\series bold
+flat24
+\series default
+\emph on
+\bar default
+
+\size default
+\emph default
+Generate 24-bit flat mode code.
+ This is the one and only that the ds390 code generator supports right now
+ and is default when using -mds390.
+ See section Memory Models for more details.
+\layout List
+\labelwidthstring 00.00.0000
+
+
\series bold
--stack-10bit
\series default
This option generates code for the 10 bit stack mode of the Dallas DS80C390
part.
+ This is the one and only that the ds390 code generator supports right now
+ and is default when using -mds390.
In this mode, the stack is located in the lower 1K of the internal RAM,
which is mapped to 0x400000.
Note that the support is incomplete, since it still uses a single byte
as the stack pointer.
This means that only the lower 256 bytes of the potential 1K stack space
- can actually be used.
+ will actually be used.
However, this does allow you to reclaim the precious 256 bytes of low RAM
for use for the DATA and IDATA segments.
The compiler will not generate any code to put the processor into 10 bit
& popping when calling small functions from larger functions.
This option can be used to switch the register saving convention for the
function names specified.
- The compiler will not save registers when calling these functions, extra
+ The compiler will not save registers when calling these functions, no extra
code will be generated at the entry & exit for these functions to save
& restore the registers used by these functions, this can SUBSTANTIALLY
reduce code & improve run time performance of the generated code.
- In future the compiler (with interprocedural analysis) will be able to
- determine the appropriate scheme to use for each function call.
+ In the future the compiler (with interprocedural analysis) will be able
+ to determine the appropriate scheme to use for each function call.
DO NOT use this option for built-in functions such as _muluint..., if this
option is used for a library function the appropriate library function
needs to be recompiled with the same option.
\bar default
(-c)
\size default
- will compile and assemble the source only, will not call the linkage editor.
+ will compile and assemble the source, but will not call the linkage editor.
\layout List
\labelwidthstring 00.00.0000
\size default
\bar default
Like `-M' but the output mentions only the user header files included with
- `#include file"'.
+ `#include
+\begin_inset Quotes eld
+\end_inset
+
+file"'.
System header files included with `#include <file>' are omitted.
\layout List
\labelwidthstring 00.00.0000
\series default
\size default
\bar default
-Stop after the stage of compilation proper; do not as- semble.
+Stop after the stage of compilation proper; do not assemble.
The output is an assembler code file for the input file specified.
\layout List
\labelwidthstring 00.00.0000
\size default
\bar default
Pass the inline assembler code through the peep hole optimizer.
- Can cause unexpected changes to inline assembler code , please go through
- the peephole optimizer rules defnied in file 'SDCCpeeph.def' before using
- this option.
+ This can cause unexpected changes to inline assembler code, please go through
+ the peephole optimizer rules defined in the source file tree '<target>/peeph.def
+' before using this option.
\layout List
\labelwidthstring 00.00.0000
\series bold
\size large
\bar under
---dumpraw
+--dumpraw
\series default
\size default
\bar default
-.
This option will cause the compiler to dump the intermediate code into
a file of named
\emph on
<source filename>.dumpraw
\emph default
- just after the intermediate code has been generated for a function , i.e.
+ just after the intermediate code has been generated for a function, i.e.
before any optimizations are done.
The basic blocks at this stage ordered in the depth first number, so they
may not be in sequence of execution.
\bar under
--dumpgcse
\series default
-\bar default
-.
-
\size default
- Will create a dump if iCode, after global subexpression elimination, into
- a file named
+\bar default
+ Will create a dump of iCode's, after global subexpression elimination,
+ into a file named
\emph on
<source filename>.dumpgcse.
\layout List
\series bold
\size large
\bar under
---dumpdeadcode
+--dumpdeadcode
\series default
\size default
\bar default
-.Will create a dump if iCode, after deadcode elimination, into a file named
-
+ Will create a dump of iCode's, after deadcode elimination, into a file
+ named
\emph on
<source filename>.dumpdeadcode.
\layout List
\series bold
\size large
\bar under
---dumploop.
-
+--dumploop
\series default
\bar default
\size default
-Will create a dump if iCode, after loop optimizations, into a file named
+Will create a dump of iCode's, after loop optimizations, into a file named
\emph on
<source filename>.dumploop.
\series bold
\size large
\bar under
---dumprange.
-
+--dumprange
\series default
\bar default
\size default
-Will create a dump if iCode, after live range analysis, into a file named
+Will create a dump of iCode's, after live range analysis, into a file named
\emph on
<source filename>.dumprange.
\series bold
\size large
\bar under
---dumpregassign.
-
+--dumpregassign
\size default
\series default
\bar default
-Will create a dump if iCode, after register assignment , into a file named
+Will create a dump of iCode's, after register assignment , into a file named
\emph on
<source filename>.dumprassgn.
\layout List
\labelwidthstring 00.00.0000
+--dumplrange Will create a dump of the live ranges of iTemp's
+\layout List
+\labelwidthstring 00.00.0000
+
\series bold
\size large
\bar under
---dumpall.
-
+--dumpall
\series default
\size default
\bar default
Will cause all the above mentioned dumps to be created.
-\layout Standard
-
-Note that the files created for the dump are appended to each time.
- So the files should be deleted manually , before each dump is created.
-
-\layout Standard
-
-When reporting bugs, it can be helpful to include these dumps along with
- the portion of the code that is causing the problem.
\layout Subsection
-MCS51 Storage Class Language Extensions
+MCS51/DS390 Storage Class Language Extensions
\layout Standard
In addition to the ANSI storage classes SDCC allows the following MCS51
/* pointer to upper 128 bytes of ram */
\layout Standard
-All unqualified pointers are treated as 3 - byte '_generic' pointers.
+All unqualified pointers are treated as 3-byte (4-bytes for the ds390) '_generic
+' pointers.
These type of pointers can also to be explicitly declared.
\layout Standard
\layout Standard
+(jwk: pending: this is obsolete and need a rewrite)
+\layout Standard
+
\family typewriter
\size scriptsize
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