Code Generation

Topics
	Just in Time Compilation

Typedefs
typedef void(*	after_transform_func) (ir_graph *irg, const char *name)

Enumerations
enum	asm_constraint_flags_t {   ASM_CONSTRAINT_FLAG_NONE = 0 , ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER = 1u << 0 , ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP = 1u << 1 , ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE = 1u << 2 ,   ASM_CONSTRAINT_FLAG_SUPPORTS_ANY = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE | ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER , ASM_CONSTRAINT_FLAG_NO_SUPPORT = 1u << 3 , ASM_CONSTRAINT_FLAG_MODIFIER_WRITE = 1u << 4 , ASM_CONSTRAINT_FLAG_MODIFIER_READ = 1u << 5 ,   ASM_CONSTRAINT_FLAG_MODIFIER_EARLYCLOBBER = 1u << 6 , ASM_CONSTRAINT_FLAG_MODIFIER_COMMUTATIVE = 1u << 7 , ASM_CONSTRAINT_FLAG_INVALID = 1u << 8 }
	flags categorizing assembler constraint specifications More...
enum	dwarf_source_language {   DW_LANG_C89 = 0x0001 , DW_LANG_C = 0x0002 , DW_LANG_Ada83 = 0x0003 , DW_LANG_C_plus_plus = 0x0004 ,   DW_LANG_Cobol74 = 0x0005 , DW_LANG_Cobol85 = 0x0006 , DW_LANG_Fortran77 = 0x0007 , DW_LANG_Fortran90 = 0x0008 ,   DW_LANG_Pascal83 = 0x0009 , DW_LANG_Modula2 = 0x000a , DW_LANG_Java = 0x000b , DW_LANG_C99 = 0x000c ,   DW_LANG_Ada95 = 0x000d , DW_LANG_Fortran95 = 0x000e , DW_LANG_PLI = 0x000f , DW_LANG_ObjC = 0x0010 ,   DW_LANG_ObjC_plus_plus = 0x0011 , DW_LANG_UPC = 0x0012 , DW_LANG_D = 0x0013 , DW_LANG_Python = 0x0014 ,   DW_LANG_Go = 0x0016 }
	Dwarf source language codes. More...

Functions
void	be_lower_for_target (void)
	Lowers current program for the target architecture.
void	be_set_after_transform_func (after_transform_func func)
	Sets a callback that is called after each transformation step in be_lower_for_target().
void	be_main (FILE *output, const char *compilation_unit_name)
	Main interface to the frontend.
asm_constraint_flags_t	be_parse_asm_constraints (const char *constraints)
	parse assembler constraint strings and returns flags (so the frontend knows which operands are inputs/outputs and whether memory is required)
int	be_is_valid_clobber (const char *clobber)
	tests whether a string is a valid clobber in an ASM instruction
void	be_dwarf_set_source_language (dwarf_source_language language)
	Sets source language for dwarf debug information.
void	be_dwarf_set_compilation_directory (const char *directory)
	Sets working directory of the compiler (or directory where the compiler searched for sources) for dwarf debug information.

Detailed Description

Code Generation (backend) produces machine-code.

Typedef Documentation

after_transform_func

typedef void(* after_transform_func) (ir_graph *irg, const char *name)

Definition at line 92 of file be.h.

Enumeration Type Documentation

asm_constraint_flags_t

enum asm_constraint_flags_t

flags categorizing assembler constraint specifications

Enumerator
ASM_CONSTRAINT_FLAG_NONE	no constraints
ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER	input/output can be in a register
ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP	input/output can be read/written to/from a memory address
ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE	input can be encoded as an immediate number
ASM_CONSTRAINT_FLAG_SUPPORTS_ANY	input/output can be in a register, in memory or an immediate
ASM_CONSTRAINT_FLAG_NO_SUPPORT	the constraint is not supported yet by libFirm (but valid in gcc)
ASM_CONSTRAINT_FLAG_MODIFIER_WRITE	The input is also written to.
ASM_CONSTRAINT_FLAG_MODIFIER_READ	the input is read
ASM_CONSTRAINT_FLAG_MODIFIER_EARLYCLOBBER	the value is modified before all inputs to the asm block are handled.
ASM_CONSTRAINT_FLAG_MODIFIER_COMMUTATIVE	This operand and the following operand are commutative.
ASM_CONSTRAINT_FLAG_INVALID	invalid constraint (due to parse error)

Definition at line 30 of file be.h.

dwarf_source_language

enum dwarf_source_language

Dwarf source language codes.

Enumerator
DW_LANG_C89
DW_LANG_C
DW_LANG_Ada83
DW_LANG_C_plus_plus
DW_LANG_Cobol74
DW_LANG_Cobol85
DW_LANG_Fortran77
DW_LANG_Fortran90
DW_LANG_Pascal83
DW_LANG_Modula2
DW_LANG_Java
DW_LANG_C99
DW_LANG_Ada95
DW_LANG_Fortran95
DW_LANG_PLI
DW_LANG_ObjC
DW_LANG_ObjC_plus_plus
DW_LANG_UPC
DW_LANG_D
DW_LANG_Python
DW_LANG_Go

Definition at line 57 of file be.h.

Function Documentation

be_dwarf_set_compilation_directory()

void be_dwarf_set_compilation_directory

(

const char *

directory

)

Sets working directory of the compiler (or directory where the compiler searched for sources) for dwarf debug information.

be_dwarf_set_source_language()

void be_dwarf_set_source_language

(

dwarf_source_language

language

)

Sets source language for dwarf debug information.

be_is_valid_clobber()

int be_is_valid_clobber

(

const char *

clobber

)

tests whether a string is a valid clobber in an ASM instruction

be_lower_for_target()

void be_lower_for_target

(

void

)

Lowers current program for the target architecture.

This must be run once before using be_main. The idea here is that the backend can perform lowerings like doubleword-lowering, ABI adjustments or implementation of boolean values, if-conversion, with target specific settings. The resulting graph is still a "normal" firm-graph on which you can and should perform further architecture-neutral optimizations before be_main.

be_main()

void be_main	(	FILE *	output,
		const char *	compilation_unit_name )

Main interface to the frontend.

be_parse_asm_constraints()

asm_constraint_flags_t be_parse_asm_constraints

(

const char *

constraints

)

parse assembler constraint strings and returns flags (so the frontend knows which operands are inputs/outputs and whether memory is required)

be_set_after_transform_func()

void be_set_after_transform_func

(

after_transform_func

func

)

Sets a callback that is called after each transformation step in be_lower_for_target().

This is typically used to run dump & verify steps to help debugging.