From 63847496f14c813a5d80efd5b7de0f1294ffe1e3 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 13 Apr 2024 16:07:11 +0200 Subject: Adding upstream version 3.45.1. Signed-off-by: Daniel Baumann --- src/vdbetrace.c | 192 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 src/vdbetrace.c (limited to 'src/vdbetrace.c') diff --git a/src/vdbetrace.c b/src/vdbetrace.c new file mode 100644 index 0000000..ae8ad31 --- /dev/null +++ b/src/vdbetrace.c @@ -0,0 +1,192 @@ +/* +** 2009 November 25 +** +** The author disclaims copyright to this source code. In place of +** a legal notice, here is a blessing: +** +** May you do good and not evil. +** May you find forgiveness for yourself and forgive others. +** May you share freely, never taking more than you give. +** +************************************************************************* +** +** This file contains code used to insert the values of host parameters +** (aka "wildcards") into the SQL text output by sqlite3_trace(). +** +** The Vdbe parse-tree explainer is also found here. +*/ +#include "sqliteInt.h" +#include "vdbeInt.h" + +#ifndef SQLITE_OMIT_TRACE + +/* +** zSql is a zero-terminated string of UTF-8 SQL text. Return the number of +** bytes in this text up to but excluding the first character in +** a host parameter. If the text contains no host parameters, return +** the total number of bytes in the text. +*/ +static int findNextHostParameter(const char *zSql, int *pnToken){ + int tokenType; + int nTotal = 0; + int n; + + *pnToken = 0; + while( zSql[0] ){ + n = sqlite3GetToken((u8*)zSql, &tokenType); + assert( n>0 && tokenType!=TK_ILLEGAL ); + if( tokenType==TK_VARIABLE ){ + *pnToken = n; + break; + } + nTotal += n; + zSql += n; + } + return nTotal; +} + +/* +** This function returns a pointer to a nul-terminated string in memory +** obtained from sqlite3DbMalloc(). If sqlite3.nVdbeExec is 1, then the +** string contains a copy of zRawSql but with host parameters expanded to +** their current bindings. Or, if sqlite3.nVdbeExec is greater than 1, +** then the returned string holds a copy of zRawSql with "-- " prepended +** to each line of text. +** +** If the SQLITE_TRACE_SIZE_LIMIT macro is defined to an integer, then +** then long strings and blobs are truncated to that many bytes. This +** can be used to prevent unreasonably large trace strings when dealing +** with large (multi-megabyte) strings and blobs. +** +** The calling function is responsible for making sure the memory returned +** is eventually freed. +** +** ALGORITHM: Scan the input string looking for host parameters in any of +** these forms: ?, ?N, $A, @A, :A. Take care to avoid text within +** string literals, quoted identifier names, and comments. For text forms, +** the host parameter index is found by scanning the prepared +** statement for the corresponding OP_Variable opcode. Once the host +** parameter index is known, locate the value in p->aVar[]. Then render +** the value as a literal in place of the host parameter name. +*/ +char *sqlite3VdbeExpandSql( + Vdbe *p, /* The prepared statement being evaluated */ + const char *zRawSql /* Raw text of the SQL statement */ +){ + sqlite3 *db; /* The database connection */ + int idx = 0; /* Index of a host parameter */ + int nextIndex = 1; /* Index of next ? host parameter */ + int n; /* Length of a token prefix */ + int nToken; /* Length of the parameter token */ + int i; /* Loop counter */ + Mem *pVar; /* Value of a host parameter */ + StrAccum out; /* Accumulate the output here */ +#ifndef SQLITE_OMIT_UTF16 + Mem utf8; /* Used to convert UTF16 into UTF8 for display */ +#endif + + db = p->db; + sqlite3StrAccumInit(&out, 0, 0, 0, db->aLimit[SQLITE_LIMIT_LENGTH]); + if( db->nVdbeExec>1 ){ + while( *zRawSql ){ + const char *zStart = zRawSql; + while( *(zRawSql++)!='\n' && *zRawSql ); + sqlite3_str_append(&out, "-- ", 3); + assert( (zRawSql - zStart) > 0 ); + sqlite3_str_append(&out, zStart, (int)(zRawSql-zStart)); + } + }else if( p->nVar==0 ){ + sqlite3_str_append(&out, zRawSql, sqlite3Strlen30(zRawSql)); + }else{ + while( zRawSql[0] ){ + n = findNextHostParameter(zRawSql, &nToken); + assert( n>0 ); + sqlite3_str_append(&out, zRawSql, n); + zRawSql += n; + assert( zRawSql[0] || nToken==0 ); + if( nToken==0 ) break; + if( zRawSql[0]=='?' ){ + if( nToken>1 ){ + assert( sqlite3Isdigit(zRawSql[1]) ); + sqlite3GetInt32(&zRawSql[1], &idx); + }else{ + idx = nextIndex; + } + }else{ + assert( zRawSql[0]==':' || zRawSql[0]=='$' || + zRawSql[0]=='@' || zRawSql[0]=='#' ); + testcase( zRawSql[0]==':' ); + testcase( zRawSql[0]=='$' ); + testcase( zRawSql[0]=='@' ); + testcase( zRawSql[0]=='#' ); + idx = sqlite3VdbeParameterIndex(p, zRawSql, nToken); + assert( idx>0 ); + } + zRawSql += nToken; + nextIndex = MAX(idx + 1, nextIndex); + assert( idx>0 && idx<=p->nVar ); + pVar = &p->aVar[idx-1]; + if( pVar->flags & MEM_Null ){ + sqlite3_str_append(&out, "NULL", 4); + }else if( pVar->flags & (MEM_Int|MEM_IntReal) ){ + sqlite3_str_appendf(&out, "%lld", pVar->u.i); + }else if( pVar->flags & MEM_Real ){ + sqlite3_str_appendf(&out, "%!.15g", pVar->u.r); + }else if( pVar->flags & MEM_Str ){ + int nOut; /* Number of bytes of the string text to include in output */ +#ifndef SQLITE_OMIT_UTF16 + u8 enc = ENC(db); + if( enc!=SQLITE_UTF8 ){ + memset(&utf8, 0, sizeof(utf8)); + utf8.db = db; + sqlite3VdbeMemSetStr(&utf8, pVar->z, pVar->n, enc, SQLITE_STATIC); + if( SQLITE_NOMEM==sqlite3VdbeChangeEncoding(&utf8, SQLITE_UTF8) ){ + out.accError = SQLITE_NOMEM; + out.nAlloc = 0; + } + pVar = &utf8; + } +#endif + nOut = pVar->n; +#ifdef SQLITE_TRACE_SIZE_LIMIT + if( nOut>SQLITE_TRACE_SIZE_LIMIT ){ + nOut = SQLITE_TRACE_SIZE_LIMIT; + while( nOutn && (pVar->z[nOut]&0xc0)==0x80 ){ nOut++; } + } +#endif + sqlite3_str_appendf(&out, "'%.*q'", nOut, pVar->z); +#ifdef SQLITE_TRACE_SIZE_LIMIT + if( nOutn ){ + sqlite3_str_appendf(&out, "/*+%d bytes*/", pVar->n-nOut); + } +#endif +#ifndef SQLITE_OMIT_UTF16 + if( enc!=SQLITE_UTF8 ) sqlite3VdbeMemRelease(&utf8); +#endif + }else if( pVar->flags & MEM_Zero ){ + sqlite3_str_appendf(&out, "zeroblob(%d)", pVar->u.nZero); + }else{ + int nOut; /* Number of bytes of the blob to include in output */ + assert( pVar->flags & MEM_Blob ); + sqlite3_str_append(&out, "x'", 2); + nOut = pVar->n; +#ifdef SQLITE_TRACE_SIZE_LIMIT + if( nOut>SQLITE_TRACE_SIZE_LIMIT ) nOut = SQLITE_TRACE_SIZE_LIMIT; +#endif + for(i=0; iz[i]&0xff); + } + sqlite3_str_append(&out, "'", 1); +#ifdef SQLITE_TRACE_SIZE_LIMIT + if( nOutn ){ + sqlite3_str_appendf(&out, "/*+%d bytes*/", pVar->n-nOut); + } +#endif + } + } + } + if( out.accError ) sqlite3_str_reset(&out); + return sqlite3StrAccumFinish(&out); +} + +#endif /* #ifndef SQLITE_OMIT_TRACE */ -- cgit v1.2.3