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21. Target Description Macros

In addition to the file `machine.md', a machine description includes a C header file conventionally given the name `machine.h'. This header file defines numerous macros that convey the information about the target machine that does not fit into the scheme of the `.md' file. The file `tm.h' should be a link to `machine.h'. The header file `config.h' includes `tm.h' and most compiler source files include `config.h'.

21.1 Controlling the Compilation Driver, `gcc'  Controlling how the driver runs the compilation passes.
21.2 Run-time Target Specification  Defining `-m' options like `-m68000' and `-m68020'.
21.3 Defining data structures for per-function information.  
21.4 Storage Layout  Defining sizes and alignments of data.
21.5 Layout of Source Language Data Types  Defining sizes and properties of basic user data types.
21.6 Register Usage  Naming and describing the hardware registers.
21.7 Register Classes  Defining the classes of hardware registers.
21.8 Stack Layout and Calling Conventions  Defining which way the stack grows and by how much.
21.9 Implementing the Varargs Macros  Defining the varargs macros.
21.10 Trampolines for Nested Functions  Code set up at run time to enter a nested function.
21.11 Implicit Calls to Library Routines  Controlling how library routines are implicitly called.
21.12 Addressing Modes  Defining addressing modes valid for memory operands.
21.13 Condition Code Status  Defining how insns update the condition code.
21.14 Describing Relative Costs of Operations  Defining relative costs of different operations.
21.15 Dividing the Output into Sections (Texts, Data, ...)  Dividing storage into text, data, and other sections.
21.16 Position Independent Code  Macros for position independent code.
21.17 Defining the Output Assembler Language  Defining how to write insns and pseudo-ops to output.
21.18 Controlling Debugging Information Format  Defining the format of debugging output.
21.19 Cross Compilation and Floating Point  Handling floating point for cross-compilers.
21.20 Mode Switching Instructions  Insertion of mode-switching instructions.
21.21 Miscellaneous Parameters  Everything else.


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This document was generated by Vincent Chung on June, 26 2001 using texi2html