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[thirdparty/gcc.git] / gcc / jit / libgccjit.h

/* A pure C API to enable client code to embed GCC as a JIT-compiler.
   Copyright (C) 2013-2014 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC 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
General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef LIBGCCJIT_H
#define LIBGCCJIT_H

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**********************************************************************
 Data structures.
 **********************************************************************/
/* All structs within the API are opaque. */

/* A gcc_jit_context encapsulates the state of a compilation.  It goes
   through two states:

   (1) "initial", during which you can set up options on it, and add
       types, functions and code, using the API below.
       Invoking gcc_jit_context_compile on it transitions it to the
       "after compilation" state.

   (2) "after compilation", when you can call gcc_jit_context_release to
       clean up.  */
typedef struct gcc_jit_context gcc_jit_context;

/* A gcc_jit_result encapsulates the result of a compilation.  */
typedef struct gcc_jit_result gcc_jit_result;

/* An object created within a context.  Such objects are automatically
   cleaned up when the context is released.

   The class hierarchy looks like this:

     +- gcc_jit_object
         +- gcc_jit_location
         +- gcc_jit_type
	    +- gcc_jit_struct
         +- gcc_jit_field
         +- gcc_jit_function
         +- gcc_jit_block
         +- gcc_jit_rvalue
             +- gcc_jit_lvalue
                 +- gcc_jit_param
*/
typedef struct gcc_jit_object gcc_jit_object;

/* A gcc_jit_location encapsulates a source code location, so that
   you can (optionally) associate locations in your language with
   statements in the JIT-compiled code, allowing the debugger to
   single-step through your language.

   Note that to do so, you also need to enable
     GCC_JIT_BOOL_OPTION_DEBUGINFO
   on the gcc_jit_context.

   gcc_jit_location instances are optional; you can always pass
   NULL.  */
typedef struct gcc_jit_location gcc_jit_location;

/* A gcc_jit_type encapsulates a type e.g. "int" or a "struct foo*".  */
typedef struct gcc_jit_type gcc_jit_type;

/* A gcc_jit_field encapsulates a field within a struct; it is used
   when creating a struct type (using gcc_jit_context_new_struct_type).
   Fields cannot be shared between structs.  */
typedef struct gcc_jit_field gcc_jit_field;

/* A gcc_jit_struct encapsulates a struct type, either one that we have
   the layout for, or an opaque type.  */
typedef struct gcc_jit_struct gcc_jit_struct;

/* A gcc_jit_function encapsulates a function: either one that you're
   creating yourself, or a reference to one that you're dynamically
   linking to within the rest of the process.  */
typedef struct gcc_jit_function gcc_jit_function;

/* A gcc_jit_block encapsulates a "basic block" of statements within a
   function (i.e. with one entry point and one exit point).

   Every block within a function must be terminated with a conditional,
   a branch, or a return.

   The blocks within a function form a directed graph.

   The entrypoint to the function is the first block created within
   it.

   All of the blocks in a function must be reachable via some path from
   the first block.

   It's OK to have more than one "return" from a function (i.e. multiple
   blocks that terminate by returning).  */
typedef struct gcc_jit_block gcc_jit_block;

/* A gcc_jit_rvalue is an expression within your code, with some type.  */
typedef struct gcc_jit_rvalue gcc_jit_rvalue;

/* A gcc_jit_lvalue is a storage location within your code (e.g. a
   variable, a parameter, etc).  It is also a gcc_jit_rvalue; use
   gcc_jit_lvalue_as_rvalue to cast.  */
typedef struct gcc_jit_lvalue gcc_jit_lvalue;

/* A gcc_jit_param is a function parameter, used when creating a
   gcc_jit_function.  It is also a gcc_jit_lvalue (and thus also an
   rvalue); use gcc_jit_param_as_lvalue to convert.  */
typedef struct gcc_jit_param gcc_jit_param;

/* Acquire a JIT-compilation context.  */
extern gcc_jit_context *
gcc_jit_context_acquire (void);

/* Release the context.  After this call, it's no longer valid to use
   the ctxt.  */
extern void
gcc_jit_context_release (gcc_jit_context *ctxt);

/* Options taking string values. */
enum gcc_jit_str_option
{
  /* The name of the program, for use as a prefix when printing error
     messages to stderr.  If NULL, or default, "libgccjit.so" is used.  */
  GCC_JIT_STR_OPTION_PROGNAME,

  GCC_JIT_NUM_STR_OPTIONS
};

/* Options taking int values. */
enum gcc_jit_int_option
{
  /* How much to optimize the code.
     Valid values are 0-3, corresponding to GCC's command-line options
     -O0 through -O3.

     The default value is 0 (unoptimized).  */
  GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL,

  GCC_JIT_NUM_INT_OPTIONS
};

/* Options taking boolean values.
   These all default to "false".  */
enum gcc_jit_bool_option
{
  /* If true, gcc_jit_context_compile will attempt to do the right
     thing so that if you attach a debugger to the process, it will
     be able to inspect variables and step through your code.

     Note that you can't step through code unless you set up source
     location information for the code (by creating and passing in
     gcc_jit_location instances).  */
  GCC_JIT_BOOL_OPTION_DEBUGINFO,

  /* If true, gcc_jit_context_compile will dump its initial "tree"
     representation of your code to stderr (before any
     optimizations).  */
  GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE,

  /* If true, gcc_jit_context_compile will dump the "gimple"
     representation of your code to stderr, before any optimizations
     are performed.  The dump resembles C code.  */
  GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE,

  /* If true, gcc_jit_context_compile will dump the final
     generated code to stderr, in the form of assembly language.  */
  GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE,

  /* If true, gcc_jit_context_compile will print information to stderr
     on the actions it is performing, followed by a profile showing
     the time taken and memory usage of each phase.
   */
  GCC_JIT_BOOL_OPTION_DUMP_SUMMARY,

  /* If true, gcc_jit_context_compile will dump copious
     amount of information on what it's doing to various
     files within a temporary directory.  Use
     GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES (see below) to
     see the results.  The files are intended to be human-readable,
     but the exact files and their formats are subject to change.
  */
  GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING,

  /* If true, libgccjit will aggressively run its garbage collector, to
     shake out bugs (greatly slowing down the compile).  This is likely
     to only be of interest to developers *of* the library.  It is
     used when running the selftest suite.  */
  GCC_JIT_BOOL_OPTION_SELFCHECK_GC,

  /* If true, gcc_jit_context_release will not clean up
     intermediate files written to the filesystem, and will display
     their location on stderr.  */
  GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES,

  GCC_JIT_NUM_BOOL_OPTIONS
};

/* Set a string option on the given context.

   The context directly stores the (const char *), so the passed string
   must outlive the context.  */
extern void
gcc_jit_context_set_str_option (gcc_jit_context *ctxt,
				enum gcc_jit_str_option opt,
				const char *value);

/* Set an int option on the given context.  */
extern void
gcc_jit_context_set_int_option (gcc_jit_context *ctxt,
				enum gcc_jit_int_option opt,
				int value);

/* Set a boolean option on the given context.

   Zero is "false" (the default), non-zero is "true".  */
extern void
gcc_jit_context_set_bool_option (gcc_jit_context *ctxt,
				 enum gcc_jit_bool_option opt,
				 int value);

/* This actually calls into GCC and runs the build, all
   in a mutex for now.  The result is a wrapper around a .so file.
   It can only be called once on a given context.  */
extern gcc_jit_result *
gcc_jit_context_compile (gcc_jit_context *ctxt);

/* To help with debugging: dump a C-like representation to the given path,
   describing what's been set up on the context.

   If "update_locations" is true, then also set up gcc_jit_location
   information throughout the context, pointing at the dump file as if it
   were a source file.  This may be of use in conjunction with
   GCC_JIT_BOOL_OPTION_DEBUGINFO to allow stepping through the code in a
   debugger.  */
extern void
gcc_jit_context_dump_to_file (gcc_jit_context *ctxt,
			      const char *path,
			      int update_locations);

/* To be called after a compile, this gives the first error message
   that occurred on the context.

   The returned string is valid for the rest of the lifetime of the
   context.

   If no errors occurred, this will be NULL.  */
extern const char *
gcc_jit_context_get_first_error (gcc_jit_context *ctxt);

/* Locate a given function within the built machine code.
   This will need to be cast to a function pointer of the
   correct type before it can be called. */
extern void *
gcc_jit_result_get_code (gcc_jit_result *result,
			 const char *funcname);

/* Once we're done with the code, this unloads the built .so file.
   This cleans up the result; after calling this, it's no longer
   valid to use the result.  */
extern void
gcc_jit_result_release (gcc_jit_result *result);


/**********************************************************************
 Functions for creating "contextual" objects.

 All objects created by these functions share the lifetime of the context
 they are created within, and are automatically cleaned up for you when
 you call gcc_jit_context_release on the context.

 Note that this means you can't use references to them after you've
 released their context.

 All (const char *) string arguments passed to these functions are
 copied, so you don't need to keep them around.  Note that this *isn't*
 the case for other parts of the API.

 You create code by adding a sequence of statements to blocks.
**********************************************************************/

/**********************************************************************
 The base class of "contextual" object.
 **********************************************************************/
/* Which context is "obj" within?  */
extern gcc_jit_context *
gcc_jit_object_get_context (gcc_jit_object *obj);

/* Get a human-readable description of this object.
   The string buffer is created the first time this is called on a given
   object, and persists until the object's context is released.  */
extern const char *
gcc_jit_object_get_debug_string (gcc_jit_object *obj);

/**********************************************************************
 Debugging information.
 **********************************************************************/

/* Creating source code locations for use by the debugger.
   Line and column numbers are 1-based.  */
extern gcc_jit_location *
gcc_jit_context_new_location (gcc_jit_context *ctxt,
			      const char *filename,
			      int line,
			      int column);

/* Upcasting from location to object.  */
extern gcc_jit_object *
gcc_jit_location_as_object (gcc_jit_location *loc);


/**********************************************************************
 Types.
 **********************************************************************/

/* Upcasting from type to object.  */
extern gcc_jit_object *
gcc_jit_type_as_object (gcc_jit_type *type);

/* Access to specific types.  */
enum gcc_jit_types
{
  /* C's "void" type.  */
  GCC_JIT_TYPE_VOID,

  /* "void *".  */
  GCC_JIT_TYPE_VOID_PTR,

  /* C++'s bool type; also C99's "_Bool" type, aka "bool" if using
     stdbool.h.  */
  GCC_JIT_TYPE_BOOL,

  /* Various integer types.  */

  /* C's "char" (of some signedness) and the variants where the
     signedness is specified.  */
  GCC_JIT_TYPE_CHAR,
  GCC_JIT_TYPE_SIGNED_CHAR,
  GCC_JIT_TYPE_UNSIGNED_CHAR,

  /* C's "short" and "unsigned short".  */
  GCC_JIT_TYPE_SHORT, /* signed */
  GCC_JIT_TYPE_UNSIGNED_SHORT,

  /* C's "int" and "unsigned int".  */
  GCC_JIT_TYPE_INT, /* signed */
  GCC_JIT_TYPE_UNSIGNED_INT,

  /* C's "long" and "unsigned long".  */
  GCC_JIT_TYPE_LONG, /* signed */
  GCC_JIT_TYPE_UNSIGNED_LONG,

  /* C99's "long long" and "unsigned long long".  */
  GCC_JIT_TYPE_LONG_LONG, /* signed */
  GCC_JIT_TYPE_UNSIGNED_LONG_LONG,

  /* Floating-point types  */

  GCC_JIT_TYPE_FLOAT,
  GCC_JIT_TYPE_DOUBLE,
  GCC_JIT_TYPE_LONG_DOUBLE,

  /* C type: (const char *).  */
  GCC_JIT_TYPE_CONST_CHAR_PTR,

 /* The C "size_t" type.  */
  GCC_JIT_TYPE_SIZE_T,

 /* C type: (FILE *)  */
  GCC_JIT_TYPE_FILE_PTR,

  /* Complex numbers.  */
  GCC_JIT_TYPE_COMPLEX_FLOAT,
  GCC_JIT_TYPE_COMPLEX_DOUBLE,
  GCC_JIT_TYPE_COMPLEX_LONG_DOUBLE

};

extern gcc_jit_type *
gcc_jit_context_get_type (gcc_jit_context *ctxt,
			  enum gcc_jit_types type_);

/* Get the integer type of the given size and signedness.  */
extern gcc_jit_type *
gcc_jit_context_get_int_type (gcc_jit_context *ctxt,
			      int num_bytes, int is_signed);

/* Constructing new types. */

/* Given type "T", get type "T*".  */
extern gcc_jit_type *
gcc_jit_type_get_pointer (gcc_jit_type *type);

/* Given type "T", get type "const T".  */
extern gcc_jit_type *
gcc_jit_type_get_const (gcc_jit_type *type);

/* Given type "T", get type "volatile T".  */
extern gcc_jit_type *
gcc_jit_type_get_volatile (gcc_jit_type *type);

/* Given type "T", get type "T[N]" (for a constant N).  */
extern gcc_jit_type *
gcc_jit_context_new_array_type (gcc_jit_context *ctxt,
				gcc_jit_location *loc,
				gcc_jit_type *element_type,
				int num_elements);

/* Struct-handling.  */

/* Create a field, for use within a struct or union.  */
extern gcc_jit_field *
gcc_jit_context_new_field (gcc_jit_context *ctxt,
			   gcc_jit_location *loc,
			   gcc_jit_type *type,
			   const char *name);

/* Upcasting from field to object.  */
extern gcc_jit_object *
gcc_jit_field_as_object (gcc_jit_field *field);

/* Create a struct type from an array of fields.  */
extern gcc_jit_struct *
gcc_jit_context_new_struct_type (gcc_jit_context *ctxt,
				 gcc_jit_location *loc,
				 const char *name,
				 int num_fields,
				 gcc_jit_field **fields);

/* Create an opaque struct type.  */
extern gcc_jit_struct *
gcc_jit_context_new_opaque_struct (gcc_jit_context *ctxt,
				   gcc_jit_location *loc,
				   const char *name);

/* Upcast a struct to a type.  */
extern gcc_jit_type *
gcc_jit_struct_as_type (gcc_jit_struct *struct_type);

/* Populating the fields of a formerly-opaque struct type.
   This can only be called once on a given struct type.  */
extern void
gcc_jit_struct_set_fields (gcc_jit_struct *struct_type,
			   gcc_jit_location *loc,
			   int num_fields,
			   gcc_jit_field **fields);

/* Unions work similarly to structs.  */
extern gcc_jit_type *
gcc_jit_context_new_union_type (gcc_jit_context *ctxt,
				gcc_jit_location *loc,
				const char *name,
				int num_fields,
				gcc_jit_field **fields);

/* Function pointers. */

extern gcc_jit_type *
gcc_jit_context_new_function_ptr_type (gcc_jit_context *ctxt,
				       gcc_jit_location *loc,
				       gcc_jit_type *return_type,
				       int num_params,
				       gcc_jit_type **param_types,
				       int is_variadic);

/**********************************************************************
 Constructing functions.
 **********************************************************************/
/* Create a function param.  */
extern gcc_jit_param *
gcc_jit_context_new_param (gcc_jit_context *ctxt,
			   gcc_jit_location *loc,
			   gcc_jit_type *type,
			   const char *name);

/* Upcasting from param to object.  */
extern gcc_jit_object *
gcc_jit_param_as_object (gcc_jit_param *param);

/* Upcasting from param to lvalue.  */
extern gcc_jit_lvalue *
gcc_jit_param_as_lvalue (gcc_jit_param *param);

/* Upcasting from param to rvalue.  */
extern gcc_jit_rvalue *
gcc_jit_param_as_rvalue (gcc_jit_param *param);

/* Kinds of function.  */
enum gcc_jit_function_kind
{
  /* Function is defined by the client code and visible
     by name outside of the JIT.  */
  GCC_JIT_FUNCTION_EXPORTED,

  /* Function is defined by the client code, but is invisible
     outside of the JIT.  Analogous to a "static" function.  */
  GCC_JIT_FUNCTION_INTERNAL,

  /* Function is not defined by the client code; we're merely
     referring to it.  Analogous to using an "extern" function from a
     header file.  */
  GCC_JIT_FUNCTION_IMPORTED,

  /* Function is only ever inlined into other functions, and is
     invisible outside of the JIT.

     Analogous to prefixing with "inline" and adding
     __attribute__((always_inline)).

     Inlining will only occur when the optimization level is
     above 0; when optimization is off, this is essentially the
     same as GCC_JIT_FUNCTION_INTERNAL.  */
  GCC_JIT_FUNCTION_ALWAYS_INLINE
};

/* Create a function.  */
extern gcc_jit_function *
gcc_jit_context_new_function (gcc_jit_context *ctxt,
			      gcc_jit_location *loc,
			      enum gcc_jit_function_kind kind,
			      gcc_jit_type *return_type,
			      const char *name,
			      int num_params,
			      gcc_jit_param **params,
			      int is_variadic);

/* Create a reference to a builtin function (sometimes called
   intrinsic functions).  */
extern gcc_jit_function *
gcc_jit_context_get_builtin_function (gcc_jit_context *ctxt,
				      const char *name);

/* Upcasting from function to object.  */
extern gcc_jit_object *
gcc_jit_function_as_object (gcc_jit_function *func);

/* Get a specific param of a function by index.  */
extern gcc_jit_param *
gcc_jit_function_get_param (gcc_jit_function *func, int index);

/* Emit the function in graphviz format.  */
extern void
gcc_jit_function_dump_to_dot (gcc_jit_function *func,
			      const char *path);

/* Create a block.

   The name can be NULL, or you can give it a meaningful name, which
   may show up in dumps of the internal representation, and in error
   messages.  */
extern gcc_jit_block *
gcc_jit_function_new_block (gcc_jit_function *func,
			    const char *name);

/* Upcasting from block to object.  */
extern gcc_jit_object *
gcc_jit_block_as_object (gcc_jit_block *block);

/* Which function is this block within?  */
extern gcc_jit_function *
gcc_jit_block_get_function (gcc_jit_block *block);

/**********************************************************************
 lvalues, rvalues and expressions.
 **********************************************************************/

extern gcc_jit_lvalue *
gcc_jit_context_new_global (gcc_jit_context *ctxt,
			    gcc_jit_location *loc,
			    gcc_jit_type *type,
			    const char *name);

/* Upcasting.  */
extern gcc_jit_object *
gcc_jit_lvalue_as_object (gcc_jit_lvalue *lvalue);

extern gcc_jit_rvalue *
gcc_jit_lvalue_as_rvalue (gcc_jit_lvalue *lvalue);

extern gcc_jit_object *
gcc_jit_rvalue_as_object (gcc_jit_rvalue *rvalue);

extern gcc_jit_type *
gcc_jit_rvalue_get_type (gcc_jit_rvalue *rvalue);

/* Integer constants. */
extern gcc_jit_rvalue *
gcc_jit_context_new_rvalue_from_int (gcc_jit_context *ctxt,
				     gcc_jit_type *numeric_type,
				     int value);

extern gcc_jit_rvalue *
gcc_jit_context_zero (gcc_jit_context *ctxt,
		      gcc_jit_type *numeric_type);

extern gcc_jit_rvalue *
gcc_jit_context_one (gcc_jit_context *ctxt,
		     gcc_jit_type *numeric_type);

/* Floating-point constants.  */
extern gcc_jit_rvalue *
gcc_jit_context_new_rvalue_from_double (gcc_jit_context *ctxt,
					gcc_jit_type *numeric_type,
					double value);

/* Pointers.  */
extern gcc_jit_rvalue *
gcc_jit_context_new_rvalue_from_ptr (gcc_jit_context *ctxt,
				     gcc_jit_type *pointer_type,
				     void *value);

extern gcc_jit_rvalue *
gcc_jit_context_null (gcc_jit_context *ctxt,
		      gcc_jit_type *pointer_type);

/* String literals. */
extern gcc_jit_rvalue *
gcc_jit_context_new_string_literal (gcc_jit_context *ctxt,
				    const char *value);

enum gcc_jit_unary_op
{
  /* Negate an arithmetic value; analogous to:
       -(EXPR)
     in C.  */
  GCC_JIT_UNARY_OP_MINUS,

  /* Bitwise negation of an integer value (one's complement); analogous
     to:
       ~(EXPR)
     in C.  */
  GCC_JIT_UNARY_OP_BITWISE_NEGATE,

  /* Logical negation of an arithmetic or pointer value; analogous to:
       !(EXPR)
     in C.  */
  GCC_JIT_UNARY_OP_LOGICAL_NEGATE
};

extern gcc_jit_rvalue *
gcc_jit_context_new_unary_op (gcc_jit_context *ctxt,
			      gcc_jit_location *loc,
			      enum gcc_jit_unary_op op,
			      gcc_jit_type *result_type,
			      gcc_jit_rvalue *rvalue);

enum gcc_jit_binary_op
{
  /* Addition of arithmetic values; analogous to:
       (EXPR_A) + (EXPR_B)
     in C.
     For pointer addition, use gcc_jit_context_new_array_access.  */
  GCC_JIT_BINARY_OP_PLUS,

  /* Subtraction of arithmetic values; analogous to:
       (EXPR_A) - (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_MINUS,

  /* Multiplication of a pair of arithmetic values; analogous to:
       (EXPR_A) * (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_MULT,

  /* Quotient of division of arithmetic values; analogous to:
       (EXPR_A) / (EXPR_B)
     in C.
     The result type affects the kind of division: if the result type is
     integer-based, then the result is truncated towards zero, whereas
     a floating-point result type indicates floating-point division.  */
  GCC_JIT_BINARY_OP_DIVIDE,

  /* Remainder of division of arithmetic values; analogous to:
       (EXPR_A) % (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_MODULO,

  /* Bitwise AND; analogous to:
       (EXPR_A) & (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_BITWISE_AND,

  /* Bitwise exclusive OR; analogous to:
       (EXPR_A) ^ (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_BITWISE_XOR,

  /* Bitwise inclusive OR; analogous to:
       (EXPR_A) | (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_BITWISE_OR,

  /* Logical AND; analogous to:
       (EXPR_A) && (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_LOGICAL_AND,

  /* Logical OR; analogous to:
       (EXPR_A) || (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_LOGICAL_OR,

  /* Left shift; analogous to:
       (EXPR_A) << (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_LSHIFT,

  /* Right shift; analogous to:
       (EXPR_A) >> (EXPR_B)
     in C.  */
  GCC_JIT_BINARY_OP_RSHIFT
};

extern gcc_jit_rvalue *
gcc_jit_context_new_binary_op (gcc_jit_context *ctxt,
			       gcc_jit_location *loc,
			       enum gcc_jit_binary_op op,
			       gcc_jit_type *result_type,
			       gcc_jit_rvalue *a, gcc_jit_rvalue *b);

/* (Comparisons are treated as separate from "binary_op" to save
   you having to specify the result_type).  */

enum gcc_jit_comparison
{
  /* (EXPR_A) == (EXPR_B).  */
  GCC_JIT_COMPARISON_EQ,

  /* (EXPR_A) != (EXPR_B).  */
  GCC_JIT_COMPARISON_NE,

  /* (EXPR_A) < (EXPR_B).  */
  GCC_JIT_COMPARISON_LT,

  /* (EXPR_A) <=(EXPR_B).  */
  GCC_JIT_COMPARISON_LE,

  /* (EXPR_A) > (EXPR_B).  */
  GCC_JIT_COMPARISON_GT,

  /* (EXPR_A) >= (EXPR_B).  */
  GCC_JIT_COMPARISON_GE
};

extern gcc_jit_rvalue *
gcc_jit_context_new_comparison (gcc_jit_context *ctxt,
				gcc_jit_location *loc,
				enum gcc_jit_comparison op,
				gcc_jit_rvalue *a, gcc_jit_rvalue *b);

/* Function calls.  */

/* Call of a specific function.  */
extern gcc_jit_rvalue *
gcc_jit_context_new_call (gcc_jit_context *ctxt,
			  gcc_jit_location *loc,
			  gcc_jit_function *func,
			  int numargs , gcc_jit_rvalue **args);

/* Call through a function pointer.  */
extern gcc_jit_rvalue *
gcc_jit_context_new_call_through_ptr (gcc_jit_context *ctxt,
				      gcc_jit_location *loc,
				      gcc_jit_rvalue *fn_ptr,
				      int numargs, gcc_jit_rvalue **args);

/* Type-coercion.

   Currently only a limited set of conversions are possible:
     int <-> float
     int <-> bool  */
extern gcc_jit_rvalue *
gcc_jit_context_new_cast (gcc_jit_context *ctxt,
			  gcc_jit_location *loc,
			  gcc_jit_rvalue *rvalue,
			  gcc_jit_type *type);

extern gcc_jit_lvalue *
gcc_jit_context_new_array_access (gcc_jit_context *ctxt,
				  gcc_jit_location *loc,
				  gcc_jit_rvalue *ptr,
				  gcc_jit_rvalue *index);

/* Field access is provided separately for both lvalues and rvalues.  */

/* Accessing a field of an lvalue of struct type, analogous to:
      (EXPR).field = ...;
   in C.  */
extern gcc_jit_lvalue *
gcc_jit_lvalue_access_field (gcc_jit_lvalue *struct_or_union,
			     gcc_jit_location *loc,
			     gcc_jit_field *field);

/* Accessing a field of an rvalue of struct type, analogous to:
      (EXPR).field
   in C.  */
extern gcc_jit_rvalue *
gcc_jit_rvalue_access_field (gcc_jit_rvalue *struct_or_union,
			     gcc_jit_location *loc,
			     gcc_jit_field *field);

/* Accessing a field of an rvalue of pointer type, analogous to:
      (EXPR)->field
   in C, itself equivalent to (*EXPR).FIELD  */
extern gcc_jit_lvalue *
gcc_jit_rvalue_dereference_field (gcc_jit_rvalue *ptr,
				  gcc_jit_location *loc,
				  gcc_jit_field *field);

/* Dereferencing a pointer; analogous to:
     *(EXPR)
*/
extern gcc_jit_lvalue *
gcc_jit_rvalue_dereference (gcc_jit_rvalue *rvalue,
			    gcc_jit_location *loc);

/* Taking the address of an lvalue; analogous to:
     &(EXPR)
   in C.  */
extern gcc_jit_rvalue *
gcc_jit_lvalue_get_address (gcc_jit_lvalue *lvalue,
			    gcc_jit_location *loc);

extern gcc_jit_lvalue *
gcc_jit_function_new_local (gcc_jit_function *func,
			    gcc_jit_location *loc,
			    gcc_jit_type *type,
			    const char *name);

/**********************************************************************
 Statement-creation.
 **********************************************************************/

/* Add evaluation of an rvalue, discarding the result
   (e.g. a function call that "returns" void).

   This is equivalent to this C code:

     (void)expression;
*/
extern void
gcc_jit_block_add_eval (gcc_jit_block *block,
			gcc_jit_location *loc,
			gcc_jit_rvalue *rvalue);

/* Add evaluation of an rvalue, assigning the result to the given
   lvalue.

   This is roughly equivalent to this C code:

     lvalue = rvalue;
*/
extern void
gcc_jit_block_add_assignment (gcc_jit_block *block,
			      gcc_jit_location *loc,
			      gcc_jit_lvalue *lvalue,
			      gcc_jit_rvalue *rvalue);

/* Add evaluation of an rvalue, using the result to modify an
   lvalue.

   This is analogous to "+=" and friends:

     lvalue += rvalue;
     lvalue *= rvalue;
     lvalue /= rvalue;
   etc  */
extern void
gcc_jit_block_add_assignment_op (gcc_jit_block *block,
				 gcc_jit_location *loc,
				 gcc_jit_lvalue *lvalue,
				 enum gcc_jit_binary_op op,
				 gcc_jit_rvalue *rvalue);

/* Add a no-op textual comment to the internal representation of the
   code.  It will be optimized away, but will be visible in the dumps
   seen via
     GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE
   and
     GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE,
   and thus may be of use when debugging how your project's internal
   representation gets converted to the libgccjit IR.  */
extern void
gcc_jit_block_add_comment (gcc_jit_block *block,
			   gcc_jit_location *loc,
			   const char *text);

/* Terminate a block by adding evaluation of an rvalue, branching on the
   result to the appropriate successor block.

   This is roughly equivalent to this C code:

     if (boolval)
       goto on_true;
     else
       goto on_false;

   block, boolval, on_true, and on_false must be non-NULL.  */
extern void
gcc_jit_block_end_with_conditional (gcc_jit_block *block,
				    gcc_jit_location *loc,
				    gcc_jit_rvalue *boolval,
				    gcc_jit_block *on_true,
				    gcc_jit_block *on_false);

/* Terminate a block by adding a jump to the given target block.

   This is roughly equivalent to this C code:

      goto target;
*/
extern void
gcc_jit_block_end_with_jump (gcc_jit_block *block,
			     gcc_jit_location *loc,
			     gcc_jit_block *target);

/* Terminate a block by adding evaluation of an rvalue, returning the value.

   This is roughly equivalent to this C code:

      return expression;
*/
extern void
gcc_jit_block_end_with_return (gcc_jit_block *block,
			       gcc_jit_location *loc,
			       gcc_jit_rvalue *rvalue);

/* Terminate a block by adding a valueless return, for use within a function
   with "void" return type.

   This is equivalent to this C code:

      return;
*/
extern void
gcc_jit_block_end_with_void_return (gcc_jit_block *block,
				    gcc_jit_location *loc);

/**********************************************************************
 Nested contexts.
 **********************************************************************/

/* Given an existing JIT context, create a child context.

   The child inherits a copy of all option-settings from the parent.

   The child can reference objects created within the parent, but not
   vice-versa.

   The lifetime of the child context must be bounded by that of the
   parent: you should release a child context before releasing the parent
   context.

   If you use a function from a parent context within a child context,
   you have to compile the parent context before you can compile the
   child context, and the gcc_jit_result of the parent context must
   outlive the gcc_jit_result of the child context.

   This allows caching of shared initializations.  For example, you could
   create types and declarations of global functions in a parent context
   once within a process, and then create child contexts whenever a
   function or loop becomes hot. Each such child context can be used for
   JIT-compiling just one function or loop, but can reference types
   and helper functions created within the parent context.

   Contexts can be arbitrarily nested, provided the above rules are
   followed, but it's probably not worth going above 2 or 3 levels, and
   there will likely be a performance hit for such nesting.  */

extern gcc_jit_context *
gcc_jit_context_new_child_context (gcc_jit_context *parent_ctxt);

/**********************************************************************
 Implementation support.
 **********************************************************************/

/* Enable the dumping of a specific set of internal state from the
   compilation, capturing the result in-memory as a buffer.

   Parameter "dumpname" corresponds to the equivalent gcc command-line
   option, without the "-fdump-" prefix.
   For example, to get the equivalent of "-fdump-tree-vrp1", supply
   "tree-vrp1".
   The context directly stores the dumpname as a (const char *), so the
   passed string must outlive the context.

   gcc_jit_context_compile will capture the dump as a
   dynamically-allocated buffer, writing it to ``*out_ptr``.

   The caller becomes responsible for calling
      free (*out_ptr)
   each time that gcc_jit_context_compile is called.  *out_ptr will be
   written to, either with the address of a buffer, or with NULL if an
   error occurred.

   This API entrypoint is likely to be less stable than the others.
   In particular, both the precise dumpnames, and the format and content
   of the dumps are subject to change.

   It exists primarily for writing the library's own test suite.  */

extern void
gcc_jit_context_enable_dump (gcc_jit_context *ctxt,
			     const char *dumpname,
			     char **out_ptr);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif  /* LIBGCCJIT_H  */