X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fdwarf2expr.h;h=883c54c30430a564d770dbf2b3e07b271c9aa877;hb=59b21252a88aa6ba488cfb19686d9cbad2577e76;hp=31381c09e69cd7fb1084c5a74cdc05a077d1d51d;hpb=f2c7657e9a0e18772ce4b0a95afd2b6546152b78;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/dwarf2expr.h b/gdb/dwarf2expr.h index 31381c09e6..883c54c304 100644 --- a/gdb/dwarf2expr.h +++ b/gdb/dwarf2expr.h @@ -1,7 +1,6 @@ /* DWARF 2 Expression Evaluator. - Copyright (C) 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010 - Free Software Foundation, Inc. + Copyright (C) 2001-2016 Free Software Foundation, Inc. Contributed by Daniel Berlin . @@ -23,6 +22,9 @@ #if !defined (DWARF2EXPR_H) #define DWARF2EXPR_H +#include "leb128.h" +#include "gdbtypes.h" + /* The location of a value. */ enum dwarf_value_location { @@ -41,14 +43,17 @@ enum dwarf_value_location DWARF_VALUE_LITERAL, /* The piece was optimized out. */ - DWARF_VALUE_OPTIMIZED_OUT + DWARF_VALUE_OPTIMIZED_OUT, + + /* The piece is an implicit pointer. */ + DWARF_VALUE_IMPLICIT_POINTER }; /* The dwarf expression stack. */ struct dwarf_stack_value { - ULONGEST value; + struct value *value; /* Non-zero if the piece is in memory and is known to be on the program's stack. It is always ok to set this to zero. @@ -62,6 +67,15 @@ struct dwarf_stack_value its current state and its callbacks. */ struct dwarf_expr_context { + dwarf_expr_context (); + virtual ~dwarf_expr_context (); + + void push_address (CORE_ADDR value, int in_stack_memory); + void eval (const gdb_byte *addr, size_t len); + struct value *fetch (int n); + CORE_ADDR fetch_address (int n); + int fetch_in_stack_memory (int n); + /* The stack of values, allocated with xmalloc. */ struct dwarf_stack_value *stack; @@ -75,39 +89,12 @@ struct dwarf_expr_context /* Target address size in bytes. */ int addr_size; - /* An opaque argument provided by the caller, which will be passed - to all of the callback functions. */ - void *baton; - - /* Return the value of register number REGNUM. */ - CORE_ADDR (*read_reg) (void *baton, int regnum); - - /* Read LENGTH bytes at ADDR into BUF. */ - void (*read_mem) (void *baton, gdb_byte *buf, CORE_ADDR addr, size_t length); - - /* Return the location expression for the frame base attribute, in - START and LENGTH. The result must be live until the current - expression evaluation is complete. */ - void (*get_frame_base) (void *baton, const gdb_byte **start, size_t *length); - - /* Return the CFA for the frame. */ - CORE_ADDR (*get_frame_cfa) (void *baton); - - /* Return the thread-local storage address for - DW_OP_GNU_push_tls_address. */ - CORE_ADDR (*get_tls_address) (void *baton, CORE_ADDR offset); + /* DW_FORM_ref_addr size in bytes. If -1 DWARF is executed from a frame + context and operations depending on DW_FORM_ref_addr are not allowed. */ + int ref_addr_size; - /* Execute DW_AT_location expression for the DWARF expression subroutine in - the DIE at DIE_OFFSET in the CU from CTX. Do not touch STACK while it - being passed to and returned from the called DWARF subroutine. */ - void (*dwarf_call) (struct dwarf_expr_context *ctx, size_t die_offset); - -#if 0 - /* Not yet implemented. */ - - /* Return the `object address' for DW_OP_push_object_address. */ - CORE_ADDR (*get_object_address) (void *baton); -#endif + /* Offset used to relocate DW_OP_addr and DW_OP_GNU_addr_index arguments. */ + CORE_ADDR offset; /* The current depth of dwarf expression recursion, via DW_OP_call*, DW_OP_fbreg, DW_OP_push_object_address, etc., and the maximum @@ -117,8 +104,9 @@ struct dwarf_expr_context /* Location of the value. */ enum dwarf_value_location location; - /* For VALUE_LITERAL, a the current literal value's length and - data. */ + /* For DWARF_VALUE_LITERAL, the current literal value's length and + data. For DWARF_VALUE_IMPLICIT_POINTER, LEN is the offset of the + target DIE of sect_offset kind. */ ULONGEST len; const gdb_byte *data; @@ -151,6 +139,78 @@ struct dwarf_expr_context two cases need to be handled separately.) */ int num_pieces; struct dwarf_expr_piece *pieces; + + /* Return the value of register number REGNUM (a DWARF register number), + read as an address. */ + virtual CORE_ADDR read_addr_from_reg (int regnum) = 0; + + /* Return a value of type TYPE, stored in register number REGNUM + of the frame associated to the given BATON. + + REGNUM is a DWARF register number. */ + virtual struct value *get_reg_value (struct type *type, int regnum) = 0; + + /* Read LENGTH bytes at ADDR into BUF. */ + virtual void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t length) = 0; + + /* Return the location expression for the frame base attribute, in + START and LENGTH. The result must be live until the current + expression evaluation is complete. */ + virtual void get_frame_base (const gdb_byte **start, size_t *length) = 0; + + /* Return the CFA for the frame. */ + virtual CORE_ADDR get_frame_cfa () = 0; + + /* Return the PC for the frame. */ + virtual CORE_ADDR get_frame_pc () + { + error (_("%s is invalid in this context"), "DW_OP_GNU_implicit_pointer"); + } + + /* Return the thread-local storage address for + DW_OP_GNU_push_tls_address or DW_OP_form_tls_address. */ + virtual CORE_ADDR get_tls_address (CORE_ADDR offset) = 0; + + /* Execute DW_AT_location expression for the DWARF expression + subroutine in the DIE at DIE_OFFSET in the CU. Do not touch + STACK while it being passed to and returned from the called DWARF + subroutine. */ + virtual void dwarf_call (cu_offset die_offset) = 0; + + /* Return the base type given by the indicated DIE. This can throw + an exception if the DIE is invalid or does not represent a base + type. SIZE is non-zero if this function should verify that the + resulting type has the correct size. */ + virtual struct type *get_base_type (cu_offset die, int size) + { + /* Anything will do. */ + return builtin_type (this->gdbarch)->builtin_int; + } + + /* Push on DWARF stack an entry evaluated for DW_TAG_GNU_call_site's + parameter matching KIND and KIND_U at the caller of specified BATON. + If DEREF_SIZE is not -1 then use DW_AT_GNU_call_site_data_value instead of + DW_AT_GNU_call_site_value. */ + virtual void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind, + union call_site_parameter_u kind_u, + int deref_size) = 0; + + /* Return the address indexed by DW_OP_GNU_addr_index. + This can throw an exception if the index is out of range. */ + virtual CORE_ADDR get_addr_index (unsigned int index) = 0; + + /* Return the `object address' for DW_OP_push_object_address. */ + virtual CORE_ADDR get_object_address () = 0; + +private: + + struct type *address_type () const; + void grow_stack (size_t need); + void push (struct value *value, int in_stack_memory); + int stack_empty_p () const; + void add_piece (ULONGEST size, ULONGEST offset); + void execute_stack_op (const gdb_byte *op_ptr, const gdb_byte *op_end); + void pop (); }; @@ -170,9 +230,11 @@ struct dwarf_expr_piece int in_stack_memory; } mem; - /* The piece's register number or literal value, for - DWARF_VALUE_REGISTER or DWARF_VALUE_STACK pieces. */ - ULONGEST value; + /* The piece's register number, for DWARF_VALUE_REGISTER pieces. */ + int regno; + + /* The piece's literal value, for DWARF_VALUE_STACK pieces. */ + struct value *value; struct { @@ -182,6 +244,15 @@ struct dwarf_expr_piece /* The length of the available data. */ ULONGEST length; } literal; + + /* Used for DWARF_VALUE_IMPLICIT_POINTER. */ + struct + { + /* The referent DIE from DW_OP_GNU_implicit_pointer. */ + sect_offset die; + /* The byte offset into the resulting data. */ + LONGEST offset; + } ptr; } v; /* The length of the piece, in bits. */ @@ -190,29 +261,66 @@ struct dwarf_expr_piece ULONGEST offset; }; -struct dwarf_expr_context *new_dwarf_expr_context (void); -void free_dwarf_expr_context (struct dwarf_expr_context *ctx); -struct cleanup * - make_cleanup_free_dwarf_expr_context (struct dwarf_expr_context *ctx); +void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *, + const char *); -void dwarf_expr_push (struct dwarf_expr_context *ctx, ULONGEST value, - int in_stack_memory); -void dwarf_expr_pop (struct dwarf_expr_context *ctx); -void dwarf_expr_eval (struct dwarf_expr_context *ctx, const gdb_byte *addr, - size_t len); -ULONGEST dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n); -CORE_ADDR dwarf_expr_fetch_address (struct dwarf_expr_context *ctx, int n); -int dwarf_expr_fetch_in_stack_memory (struct dwarf_expr_context *ctx, int n); +int dwarf_block_to_dwarf_reg (const gdb_byte *buf, const gdb_byte *buf_end); +int dwarf_block_to_dwarf_reg_deref (const gdb_byte *buf, + const gdb_byte *buf_end, + CORE_ADDR *deref_size_return); -const gdb_byte *read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, - ULONGEST * r); -const gdb_byte *read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, - LONGEST * r); +int dwarf_block_to_fb_offset (const gdb_byte *buf, const gdb_byte *buf_end, + CORE_ADDR *fb_offset_return); -const char *dwarf_stack_op_name (unsigned int, int); +int dwarf_block_to_sp_offset (struct gdbarch *gdbarch, const gdb_byte *buf, + const gdb_byte *buf_end, + CORE_ADDR *sp_offset_return); -void dwarf_expr_require_composition (const gdb_byte *, const gdb_byte *, - const char *); +/* Wrappers around the leb128 reader routines to simplify them for our + purposes. */ + +static inline const gdb_byte * +gdb_read_uleb128 (const gdb_byte *buf, const gdb_byte *buf_end, + uint64_t *r) +{ + size_t bytes_read = read_uleb128_to_uint64 (buf, buf_end, r); + + if (bytes_read == 0) + return NULL; + return buf + bytes_read; +} + +static inline const gdb_byte * +gdb_read_sleb128 (const gdb_byte *buf, const gdb_byte *buf_end, + int64_t *r) +{ + size_t bytes_read = read_sleb128_to_int64 (buf, buf_end, r); + + if (bytes_read == 0) + return NULL; + return buf + bytes_read; +} + +static inline const gdb_byte * +gdb_skip_leb128 (const gdb_byte *buf, const gdb_byte *buf_end) +{ + size_t bytes_read = skip_leb128 (buf, buf_end); + + if (bytes_read == 0) + return NULL; + return buf + bytes_read; +} + +extern const gdb_byte *safe_read_uleb128 (const gdb_byte *buf, + const gdb_byte *buf_end, + uint64_t *r); + +extern const gdb_byte *safe_read_sleb128 (const gdb_byte *buf, + const gdb_byte *buf_end, + int64_t *r); + +extern const gdb_byte *safe_skip_leb128 (const gdb_byte *buf, + const gdb_byte *buf_end); #endif /* dwarf2expr.h */